Configurable Intervertebral Implant
The present disclosure relates to a surgical device, such as a surgical implant, which may be used in several types of procedures. More specifically, the present disclosure relates to implants for use in an anterior, posterior, posterior lateral or direct lateral approach to the disc space. The surgical device may be manipulated in various manners to accommodate delivery through a minimally invasive portal in one configuration and adjusted to a second configuration once placed in the intervertebral space. A delivery system for placing the surgical device in a body is also disclosed.
This application is a divisional of U.S. patent application Ser. No. 14/859,828, filed Sep. 21, 2015, now U.S. Pat. No. 10,159,475, issued Dec. 25, 2018, which is a continuation-in-part of U.S. patent application Ser. No. 14/286,639, filed May 23, 2014, now U.S. Pat. No. 9,615,938, issued Apr. 11, 2017, and claims priority under 35 U.S.C. § 119(e) to U.S. Provisional Application No. 62/052,790, filed Sep. 19, 2014. U.S. patent application Ser. No. 14/286,639 is a continuation-in-part of U.S. patent application Ser. No. 12/434,328, filed May 1, 2009, now U.S. Pat. No. 8,734,515, issued May 27, 2014 which in turn claims priority to U.S. Provisional Application No. 61/051,036, filed on May 7, 2008. Each of these applications is incorporated herein by reference in its entirety.
FIELD OF THE INVENTIONThe present disclosure relates to the field of medical devices and is generally directed towards a device for insertion between two adjacent vertebral bodies and to devices for distracting two or more anatomical features. The device may be manipulated in various manners to accommodate delivery through a minimally invasive portal in one configuration and adjusted to a second configuration once placed in the intervertebral space. The device may also be adapted for use with a specific patient in a surgical setting and have contact surfaces with shapes based on the patient's unique anatomical features.
BACKGROUND OF THE INVENTIONIndividuals who suffer degenerative disc disease, natural spine deformations, a herniated disc, spine injuries or other spine disorders often require surgery on the affected region to relieve the individual from pain and prevent further injury. Such spinal surgeries may involve removal of damaged joint tissue, insertion of a tissue implant and/or fixation of two or more adjacent vertebral bodies, with the surgical procedure varying depending on the nature and extent of the injury. For patients with varying degrees of degenerative disc disease and/or nerve compression with associated lower back pain, spinal fusion surgery or lumbar arthrodesis (“fusion”) is commonly used to treat the degenerative disease. Fusion commonly involves distracting and/or decompressing one or more intervertebral spaces, followed by removing any associated facet joints or discs, and then joining or “fusing” two or more adjacent vertebra together. Fusion of vertebral bodies also commonly involves fixation of two or more adjacent vertebrae, which may be accomplished through introduction of rods or plates, and screws or other devices into a vertebral joint to join various portions of a vertebra to a corresponding portion on an adjacent vertebra.
Fusion may occur in the lumbar, thoracic or cervical spine region of a patient. Fusion requires tools for accessing the vertebrae and implanting the desired implant, any bone graft or bioactive material, etc. Such procedures often require introduction of additional tools and/or instruments, including drills, drill guides, debridement tools, irrigation devices, vises, clamps, cannulae, retractors, distracters, cutting tools, cutting guides and other insertion/retraction tools and instruments to prepare the space for achieving fusion. The insertion, alignment and placement of these surgical devices are critical to the success of the operation. As such, providing an adjustable or otherwise configurable surgical device or implant, which is flexible and configurable to meet the particular patient's needs and any existing constraints, increases the likelihood that the surgical procedure will be successful.
Given the complexities of surgical procedures, as well as anatomical variation between patients who receive surgical devices, it is often challenging to provide a device or implant that achieves the needs of a particular patient without completely customizing the device or implant for a single patient. In particular, implants are often designed for ease of use during insertion, but compromise the implant's ability to provide adequate support or fail to properly restore disc height, for example. Thus, there is a present and long felt need to provide an implant which may be manipulated in various manners according to the stage of the surgical procedure, and in particular accommodate delivery through a minimally invasive portal. There is also a present need for an implant that may quickly, easily and efficiently be manipulated in a plurality of configurations.
Although expandable implants have been proposed, the prior art fails to teach the novel aspects of the present disclosure. For example, prior art implants are not suitable for use in a surgical procedure where the implant is first inserted through a minimally invasive portal, then easily manipulated and configured to conform to the patient's anatomical features and provide better stability and/or load sharing. Current implant designs also do not assist the surgeon in completing the surgical procedure(s) quickly, safely and efficiently, and are also subject to the problems and risks noted above. Other advantages over the prior art will become known upon review of the Summary and Detailed Description of the Invention and appended drawing figures.
SUMMARY OF THE INVENTIONThe present disclosure relates to surgical devices, including surgical implants, which may be used in several types of procedures. More specifically, but not exclusively, the present disclosure relates to implants for use in an anterior, posterior, posterior lateral or direct lateral approach to the disc space.
Intervertebral discs, which are located between endplates of adjacent vertebrae, normally stabilize the spine and distribute forces between the vertebrae and cushion vertebral bodies. The spinal discs may be displaced or damaged due to trauma, disease or aging. Displacement or damage to the intervertebral discs may result in nerve damage, pain, numbness, muscle weakness, and even paralysis. Furthermore, as a result of the normal aging processes, these discs dehydrate and harden, thereby reducing the disc space height and producing instability of the spine and decreased mobility.
Access to a damaged disc space may be accomplished from several approaches to the spine. One approach is to gain access to the anterior portion of the spine through a patient's abdomen. A posterior approach may also be utilized. A posterior lateral approach, such as the transforaminal approach, may also be utilized. A direct lateral approach may also be employed.
While it is desirable in these approaches to place one or more implants into a single disc space so that the load of the spinal column is evenly distributed, implants are often designed to facilitate placement through a single approach; however, implants designed for a single approach sacrifice key implant features necessary to accomplish the goals of the surgical procedure. In addition, accurate placement, and subsequent manipulation of implants in the disc space has heretofore been extremely difficult, particularly in light of the complexity associated with prior art expandable implants.
According to one aspect of the present disclosure, a surgical device is described which may be manipulated in various manners to accommodate delivery through a minimally invasive portal in one configuration and adjusted to a second configuration once placed in the intervertebral space. Varying embodiments described herein permit a surgeon or other medical professional to quickly and easily manipulate the implant to achieve one or more configurations as required for the particular approach and/or operation. The adjustable surgical devices described herein provide an advantage over the prior art, in particular by providing one or more adjustable features for maximizing the effectiveness of the surgical device, which in turn reduces the likelihood of misalignment, misplacement and subsequent mistake during the surgical procedure(s).
According to another aspect of the present disclosure, a surgical device is described which includes one or more adjustable features for achieving a desired outcome for a particular surgical procedure. More specifically, surgeons have the ability to readily convert magnetic resonance imaging (MM) data or computed tomography (CT) data into a data set readable by computer-aided design (CAD) program and/or finite element modeling (FEM) program. This data may be used to create a surgical plan that accounts for unique anatomical variations and other constraints, and permits the surgeon to efficiently insert, place and manipulate the device or implant within an intervertebral space. Thus, the surgical device of one embodiment may be inserted in a first configuration and then adjusted to a second configuration that allows the structural aspects of the surgical device to be accurately aligned with the structural needs of the patient.
Incorporated by reference in their entireties are the following U.S. patents and patent applications directed generally to methods and apparatus related to surgical procedures, thus providing written description support for various aspects of the present disclosure. The U.S. patents and pending applications incorporated by reference are as follows: U.S. Pat. Nos. 7,957,824, 7,844,356, 7,658,610, 6,830,570, 6,368,325, 3,486,505 and U.S. Pat. Pub. Nos. 2010/0217336, 2009/0138020, 2009/0087276, 2008/0161817, 2008/0114370, and 2007/0270875.
Additionally, U.S. Pat. Nos. 8,758,357 and 8,870,889 and U.S. Patent Publication No. 2014/0350614 are incorporated by reference for the express purpose of illustrating a system and method for creating an implant, such as the one described herein, using additive manufacturing or other techniques, wherein the implant incorporates one or more patient-matched surfaces or is otherwise customized to a particular patient.
One aspect of the present invention is to provide a surgical device for insertion in an intervertebral space between adjacent vertebrae. The device includes, but is not limited to: (1) a first module including a bore; (2) an armature that is slidingly engagable in the bore of the first module; and (3) a second module connectable to a distal end of the armature such that the surgical device has an adjustable configuration achieved by adjustment of the position of the armature within the bore of the first module. A plurality of second modules of a variety of shapes and sizes may be provided for connection to the armature.
The device can be assembled during a surgical procedure. Thus, the armature can be introduced at least partially into the bore during the surgical procedure. A second module of a desired size and shape may be selected by a surgeon during a surgical procedure. The selected second module can then be connected to the armature during the procedure. The device may then be inserted into the intervertebral space. Further, the device may be removed from the intervertebral space, at least partially disassembled, and a different second module selected and interconnected to the armature.
In one embodiment, the armature is slidingly adjustable with respect to the first module. In another embodiment, the armature is rotatably adjustable in the bore of the first module. Thus, the armature may be rotated axially while the first module remains substantially stationary. Patient specific surfaces may be formed on exterior surfaces of the surgical device, the surfaces adapted to substantially conform to a selected portion of the patient's anatomy. In one embodiment, the second module includes a patient specific surface. In another embodiment, the first module includes a patient specific surface.
In one embodiment, the armature is adapted to be adjusted after insertion of the surgical device in the intervertebral space to extend the surgical device across a portion of the disc space to provide bi-lateral support to the adjacent vertebrae. Optionally, the surgical device may include a stop to maintain the armature and the second module in a desired position. The stop may comprise an aperture formed in the first module that is adapted to receive a threaded fixture that can be rotated to apply a force to the armature. In another embodiment, the surgical device includes three adjustable armatures. Each armature may include a module. In another embodiment, the surgical device includes three modules at a distal end, the first module in a medial position, and two modules at a proximal end.
The surgical device may further comprise an aperture communicating with a bore in the surgical device. The aperture is operable to receive implant material and the bore is operable to deliver the implant material through the surgical device to at least partially fill the intervertebral space around the surgical device with the implant material.
In one embodiment, the second module is operable to at least partially distract the adjacent vertebrae. The second module may have a tapered shape with a decreased thickness at a portion of the second module distal to the first module.
In another embodiment, the surgical device has an insertion configuration with a first width sized to be received between the adjacent vertebrae. The surgical device has a deployed configuration with a second width that is greater than the first width.
It is another aspect of the present invention to provide a spinal implant adapted for insertion in a space between adjacent vertebrae. The spinal implant includes: (1) a primary module; and (2) a first adjustable armature and a second adjustable armature interconnected to the primary module, the first and second adjustable armatures each including a proximal end with a proximal module and a distal end with a distal module.
The proximal modules and distal modules may be interconnected to the adjustable armatures during a surgical procedure. Each of the proximal and distal modules may be exchanged for modules of different sizes and shapes. The first and second adjustable armatures are operable to move in relation to the primary module to change a position of the proximal and distal modules. In one embodiment, the first and second armatures are formed of a flexible material. In another embodiment, the first and second armatures are formed of a material with shape memory. Optionally, at least one of the first and second armatures is substantially linear. In another embodiment, at least one of the first and second armatures has a generally arcuate shape. The spinal implant may be formed such that at least a portion of each of the distal modules is thinner than the primary module. In another embodiment, the spinal implant includes a void in the primary module. The void is adapted to receive implant material.
In yet another aspect of the present invention, an assembly for accessing an intervertebral space and inserting a spinal implant between adjacent vertebrae is provided. The assembly generally comprises: an access port and an implant. The access port may include a cannula with a body. The cannula body includes a bore and a distal end with distractor plates, the distractor plates forming a tip adapted to at least partially distract the adjacent vertebrae a first distance.
The access port also includes a distractor with at least one distractor block sized to move through the cannula bore. the distractor block are adapted to move the distractor plates to an expanded position such that the distraction of the adjacent vertebrae is increased to a second distance that is greater than the width of the cannula. The access port further includes a shaft with a second bore, the second bore adapted to guide an implant to the intervertebral space, the expansion tube sized to fit within the cannula bore and move the distractor block radially beyond a width of the cannula body to increase the distraction of the adjacent vertebrae to a third distance. In one embodiment, the distractor includes one distractor block. In another embodiment, the distractor includes two distractor blocks. In still another embodiment, after the distractor block is in the radially extended position, a second distractor with at least one second distractor block is inserted in the cannula bore. Thereafter, the expansion tube can be used to move the second distractor block radially beyond the cannula body to increase the distraction to a fourth distance greater than the third distance.
The implant is sized to fit through the second bore of the expansion tube and generally includes a first module and at least one armature adjustable with respect to the first module. A distal module is interconnected to a distal end of the armature. The implant may also include an engaging portion for engagement by a tool used to move the implant through the second bore of the expansion tube into the intervertebral space. In one embodiment, the engaging portion includes an aperture formed in the first module, the aperture including internal threads. The engaging portion may be adapted to be manipulated by the tool to lock the armature in a desired position. Optionally, the engaging portion protrudes from a surface of the at least one of the modules.
In one embodiment, the position of the armature is adjustable by the tool used to move the implant. Optionally, the armature may include a first portion rotatably interconnected to a second portion. Thus, the distal module is radially adjustable with respect to the first module.
In another embodiment, an exterior surface of at least one of the modules includes a plurality of one of the set comprising grooves, protrusions, and spikes.
The cannula body may include at least one longitudinal corner with a rounded edge to facilitate axial rotation of the cannula body between the adjacent vertebrae. In one embodiment, an exterior surface of the expansion tube shaft is keyed to engage a predetermined portion of the cannula bore.
In accordance with an aspect of the present invention, a method of inserting implant material into an intervertebral space is disclosed. The method includes, but is not limited to, the steps of: (1) positioning a leading end of a surgical device between adjacent vertebrae in first orientation, the leading end having a first dimension aligned with a rostral-caudal direction and a second dimension larger than the first dimension and aligned in a lateral direction; (2) rotating the leading end of the surgical device relative to the adjacent vertebrae to align the larger second dimension with the rostral-caudal direction and distract the adjacent vertebrae; (3) loading the implant material into a cannula, wherein the implant material is not under compression during the step of rotating; and (4) subsequent to the step of rotating, advancing the implant through the cannula and into the intervertebral space from the leading end.
In some forms, the step of positioning includes compressing the leading end in the rostral-caudal direction.
In some forms, the step of loading is prior to the step of positioning.
In some forms, the step of advancing the implant material includes expanding the leading end via force exerted by the implant material, the force received from an advancing rod.
In some forms, the method includes the step of selecting the implant material from one or more of fusion devices and bone graft material.
In some forms, the step of positioning includes determining a position of the surgical device by placing stops formed on the leading end against the adjacent vertebrae.
In some forms, the method further includes the step of preparing, wherein the step of preparing includes one or more of removing natural spinal disc material and determining geometrical features of the intervertebral space.
According to various embodiments, the implant may also comprise one or more patient-contacting surfaces formed to be substantially congruent with the anatomical features of a patient. The preconfigured implant may be configured such that the patient-contacting surfaces are configured to contact the plurality of anatomical features in a mating engagement, to ensure proper orientation, insertion, alignment and placement of the implant.
According to one aspect of the present disclosure, a surgical device is disclosed, which may further comprise one or more features for receiving at least one instrument. In one embodiment, the instrument may be used for distraction and insertion of one or more surgical devices, such as by way of example between adjacent vertebrae. The instrument may comprise an elongated barrel, an operative end formed on a distally-located end of the barrel, the operative end provided for engaging the adjacent vertebrae. The operative end of the barrel may include a plurality of slots allowing at least the operative end to be expanded.
According to one embodiment, the instrument further comprises a major dimension and a minor dimension, a cannula leading from a proximally-located portion of the barrel to an opening thereof, the opening at the operative end for disposing of the implant material therefrom. According to this embodiment, the operative end minor dimension is sized to be received between the adjacent vertebrae in an initial insertion, the major dimension is sized for distracting the adjacent vertebrae to permit the surgical device to be disposed thereinto, the vertebrae being distracted by rotation of the operative end after the initial insertion, and the surgical device is retained within the cannula without significant compression during rotation of the operative end.
In some forms, the surgical device further includes a loading chamber for loading of the implant material into the cannula and a reciprocable rod disposed at least partially in the cannula for advancing the implant material therethrough and from the opening. The cannula may have a non-uniform size such that the cannula is smaller at the opening. The implant material may be advanced through the opening to expand the operative end. The implant material may be advanced through the opening to at least partially distract the adjacent vertebrae.
In some forms, the rod may be advanced by actuation of a trigger, rotating knob, or other actuator, operatively connected to the rod.
In another aspect, a surgical device for distraction and insertion of intervertebral implant material in an intervertebral space between adjacent vertebrae is disclosed. The surgical device may include, but is not limited to: (1) an elongated barrel; (2) an operative end formed on a distally-located end of the barrel, the operative end for engaging the adjacent vertebrae and the operative end including a plurality of slots allowing at least the operative end to be expanded; (3) a cannula leading from a proximally-located portion of the barrel to an opening thereof, the opening at the operative end for disposing of the implant material therefrom; and (4) an inner member reciprocable within the barrel and having features located thereon for engaging surfaces of the slots of the barrel, movement of the features against the surfaces expanding the barrel and distracting adjacent vertebrae when the operative end is located thereat. The operative end of the barrel includes a rostral-caudal dimension and a lateral dimension. The operative end rostral-caudal dimension is sized to be received between the adjacent vertebrae in an initial insertion,
In some forms, the slots are angled, and the inner member features are wedge-shaped for contacting the angled slots. Retraction of the inner member in a direction away from the operative end may force the wedges through the slots to expand the barrel in the rostral-caudal dimension.
In some forms, surgical device may include stops for maintaining the features in the desired position along the slots.
In some forms, the surgical device further includes a loading chamber for loading of the implant material into the cannula. A reciprocable rod may be included and disposed at least partially in the cannula for advancing the implant material therethrough and from the opening.
In some forms, the implant material may be advanced through the opening to at least partially distract the adjacent vertebrae.
In some forms, the rod may be advanced by actuation of a trigger, rotating knob, or other actuator, operatively connected to the rod.
In some embodiments, the surgical device comprises a component for mating and/or docking against one or more anatomical features of a patient.
In some embodiments, the surgical device comprises a cam mechanism that permits a user to at least partially distract adjacent vertebrae.
In some embodiments, the surgical device comprises a barrel that permits a user to at least partially distract patient tissue and/or dilate the barrel for use of the surgical device in a minimally invasive surgical procedure.
Another aspect of the present invention is a system for distraction and insertion of implant material in an intervertebral space between adjacent vertebrae. The system may include, but is not limited to a surgical device and a cannula.
The surgical device includes a barrel with a longitudinal length from a distal end to a proximal end. An operative end of the barrel is fixedly attached and integral to the distal end of the barrel. The operative end comprises: a longitudinal length from a distal end to a proximal end; a first and second major straight side comprising a first dimension; a first and second minor straight side comprising a second dimension that is smaller than the first dimension; a first slot that separates the first major straight side into two parts; a second slot that separates the second straight major side into two parts; a third slot that separates the first minor straight side into two parts; and a fourth slot that separates the second minor straight side into two parts.
The cannula comprises a cannula body that extends along the longitudinal length of the barrel or the surgical device. The cannula body extends the entirety of the longitudinal length of the surgical device and terminates at or near the distal end of the surgical device. The cannula also includes at least one expandable mechanism to distract the adjacent vertebrae when an implant material passes therethrough.
In one embodiment, the surgical device includes an inner member reciprocable within the barrel. The inner member has features located on at least one outer surface of the inner member for engaging the first, second, third and fourth slots to expand the operative end of the barrel. In another embodiment, the inner member is a rod. The inner member features comprise one or more contours on the outer surfaces of the rod. In yet another embodiment, movement of the inner member in a direction towards the operative end forces the operative end of the barrel to expand. The barrel may further include one or more stops for maintaining the features of the inner member in a desired position along the length of the elongated barrel.
One having skill in the art will appreciate that embodiments of the present disclosure may have various sizes. The sizes of the various elements of embodiments of the present disclosure may be sized based on various factors including, for example, the anatomy of the patient, the person or other device operating with or otherwise using the apparatus, the surgical site location, physical features of the devices and instruments used with the devices described herein, including, for example, width, length and thickness, and the size of the surgical apparatus.
One having skill in the art will appreciate that embodiments of the present disclosure may be constructed of materials known to provide, or predictably manufactured to provide the various aspects of the present disclosure. These materials may include, for example, stainless steel, titanium alloy, aluminum alloy, chromium alloy, and other metals or metal alloys. These materials may also include, for example, PEEK, carbon fiber, ABS plastic, polyurethane, polyethylene, photo-polymers, resins, particularly fiber-encased resinous materials rubber, latex, synthetic rubber, synthetic materials, polymers, and natural materials.
One having skill in the art will appreciate that embodiments of the present disclosure may be used in conjunction devices that employ automated or semi-automated manipulation.
The Summary of the Invention is neither intended nor should it be construed as being representative of the full extent and scope of the present disclosure. The present disclosure is set forth in various levels of detail in the Summary of the Invention as well as in the attached drawings and the Detailed Description of the Invention and no limitation as to the scope of the present disclosure is intended by either the inclusion or non-inclusion of elements, components, etc. in this Summary of the Invention. Additional aspects of the present disclosure will become more readily apparent from the Detailed Description, particularly when taken together with the drawings.
The phrases “at least one,” “one or more,” and “and/or,” as used herein, are open-ended expressions that are both conjunctive and disjunctive in operation. For example, each of the expressions “at least one of A, B and C,” “at least one of A, B, or C,” “one or more of A, B, and C,” “one or more of A, B, or C,” and “A, B, and/or C” means A alone, B alone, C alone, A and B together, A and C together, B and C together, or A, B and C together.
Unless otherwise indicated, all numbers expressing quantities, dimensions, conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term “about.”
The term “a” or “an” entity, as used herein, refers to one or more of that entity. As such, the terms “a” (or “an”), “one or more” and “at least one” can be used interchangeably herein.
The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Accordingly, the terms “including,” “comprising,” or “having” and variations thereof can be used interchangeably herein.
It shall be understood that the term “means” as used herein shall be given its broadest possible interpretation in accordance with 35 U.S.C., Section 112(f). Accordingly, a claim incorporating the term “means” shall cover all structures, materials, or acts set forth herein, and all of the equivalents thereof. Further, the structures, materials, or acts and the equivalents thereof shall include all those described in the Summary of the Invention, Brief Description of the Drawings, Detailed Description, Abstract, and Claims themselves.
The above-described benefits, embodiments, and/or characterizations are not necessarily complete or exhaustive, and in particular, as to the patentable subject matter disclosed herein. Other benefits, embodiments, and/or characterizations of the present disclosure are possible utilizing, alone or in combination, as set forth above and/or described in the accompanying figures and/or in the description herein below. However, the claims set forth herein below define the invention.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and together with the general description of the disclosure given above and the detailed description of the drawings given below, serve to explain the principles of the disclosures.
It should be understood that the drawings are not necessarily to scale. In certain instances, details that are not necessary for an understanding of the disclosure or that render other details difficult to perceive may have been omitted. It should be understood, of course, that the disclosure is not necessarily limited to the particular embodiments illustrated herein.
In the drawings:
Similar components and/or features may have the same reference number. Components of the same type may be distinguished by a letter following the reference number. If only the reference number is used, the description is applicable to any one of the similar components having the same reference number.
DETAILED DESCRIPTIONFor the purposes of promoting an understanding of the principles of the present invention, reference will now be made to the embodiments illustrated in the drawings, and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is intended thereby. Any alterations and further modification in the described processes, systems, or devices, and any further applications of the principles of the invention as described herein are contemplated as would normally occur to one skilled in the art to which the invention relates.
By way of example but not limitation, the present disclosure will be described most often in connection with a minimally-invasive approach to the disc space, such as by way of example a transforaminal approach. However, it is expressly understood that with any of the approaches described in the Summary above, it is often difficult to prepare the proper locations in the disc space to receive an implant. In addition, another difficulty in these different approaches to the disc space is achieving proper positioning of the implant, particularly in the portion of the disc space most distal from the access portal when placing the implant via a minimally-invasive approach. While it is desirable that the implant be ideally positioned in the disc space, it is often too difficult to move the implant across the disc space or within the disc space once the implant is inserted. Thus, the present disclosure should be understood as having utility across a number of different approaches to the disc space. Furthermore, the present disclosure should not be viewed as having utility limited to a human patient's spine.
As shown in
Referring now to
In greater detail, a form of the IDD 10 includes an elongated insertion and distraction portion referred to herein as a barrel 20 having the operative end 12 distally located from a stock end 22. The barrel 20 includes a loading chamber 24 which includes an opening 26 extending from the cannula 14 through the barrel 20 to the environment so that one or more implants may be inserted through the opening 26 and into the cannula 14.
The cannula 14 extends the entire length of the barrel 20. At the stock end 22, a rod 30 is disposed. The rod 30 may, in one use, be viewed as a push rod; however, a distal end 30a of the rod 30 may be connected with a dummy or trial device, such as a sizer, so that the trial device is inserted into the intervertebral space to determine a proper size for a subsequently-inserted implant, in which case the rod 30 would also pull in order to remove the trial device. The rod 30 may also consist of a plurality of rods (not shown), some or all of which may penetrate the implant or implants, partially or completely.
These rods may move independently of one another, and to varying degrees, and may contact one or all components of a multi-component implant or a plurality of implants. The rod distal end 30a may also be adapted to manipulate implants. For example, in one embodiment of the present invention, the rod 30 is operable to manipulate the adjustable armatures of surgical devices to a deployed configuration as described in more detail below in conjunction with
The distal end 30a of the rod may also be used to rotate threaded fixtures, such as screws. In another example, the rod 30 is adapted to manipulate a lock of a surgical device to fix an implanted surgical device in a configuration determined by a surgeon. The rod 30 may introduce or manipulate a screw or other connection member to fix the surgical device in the determined configuration. In another embodiment, the rod distal end 30a includes a grasping feature adapted to bend or reshape portions of implants, including armatures of the implants.
Thus, the rod 30 (or rods) may also serve as a guide mechanism for the implant(s) thru the cannula 14, and beyond the barrel 20, and into the intervertebral space, to a predetermined location, for predicable deployment, as well as enable assembly of the of the implant(s) and components into a final construct in the intervertebral space.
The loading chamber 24 allows access to the rod distal end 30a when the rod is in an at least partially retracted or withdrawn position. As an example, the rod distal end 30a may be threaded so as to be received within internal threads of an implant.
In another form, the rod 30 may be removed to allow a second rod or plunger (not shown) to be used for, as an example, a sizer or a targeting device. The targeting device may have a geometry matching or closely approximating that of the implants to be used. Use of the targeting device allows the user to manually and tactilely determine the shape (including contours) of the intervertebral size, as well as assess and select alignment of the IDD 10 with the vertebrae and intervertebral space. The second rod may provide a depth gauge, such as graduated or other depth markings, enabling a surgeon to determine the depth at which the implant should be inserted. In the subsequent implant insertion, the surgeon can operate the rod 30 to the same depth, or at least one determined based upon the use of the targeting device. Towards that end, the rod 30 may have graduated markings identical, similar, or corresponding to those of the second rod.
Accordingly, the rod 30 reciprocates to and between advanced and retracted/withdrawn positions within the cannula 14. The rod 30 may be withdrawn to be clear of the loading chamber 24, thus permitting an implant to be deposited into the loading chamber 24. The rod 30 may then be advanced or extended to a position so that the implant is forced beyond the barrel operative end 12 and, thus, inserted into the intervertebral space.
A distal section 40 of the barrel 20, including the operative end 12, is used for distraction of the adjacent vertebrae. A terminal portion 42 of the operative end 12 of the barrel distal section 40 has a reduced dimension to allow a portion thereof to be received between the adjacent vertebrae. More specifically, the operative end 12 includes a major dimension 44 extending in a first direction and a minor dimension 46 extending in a second direction. During initial insertion of the IDD 10 and, specifically, of the terminal portion 42 between the vertebrae, the major dimension 44 is aligned laterally and generally parallel to the general plane of the natural disc and intervertebral space (which is generally horizontal in an erect human, transverse to the longitudinal extent of the spine). The distal section 40 of the barrel 20 includes longitudinal slots 70. The slots 70 allow the distal section 40 to be compressed during the initial insertion.
After initial insertion of the terminal portion 42, the user then proceeds to force vertebral distraction. The user may apply an axial force along the longitudinal direction, thus utilizing a wedge or chamfer 42a formed on the terminal portion 42 to provide an initial distraction amount.
Regardless, the user rotates the terminal portion 42 to cause distraction of the adjacent vertebrae. Generally speaking, the entire IDD 10 is rotated so that the major dimension 44 of the operative end 12 is shifted from the first orientation generally aligned with the small intervertebral space to a second orientation to be aligned with the superior-inferior longitudinal spinal axis (rostral-caudal). This movement necessarily forces the adjacent vertebrae apart, the outer surface 42b (such as radiused corners illustrated in
It is also preferred that the terminal portion 42 includes stops 60 formed on the terminal portion 42. In a first form, the stops 60 are formed as shoulders 62 on major sides 52 to limit the amount of insertion of the IDD 10 between the vertebrae. The stops 60 provide a predetermined position relative to at least sides of the vertebrae and, more preferably, a predetermined position relative to the intervertebral space. More specifically, with a knowledge of the intervertebral dimensions and contours, and a knowledge of the size and shape of the vertebrae, the IDD 10 can be placed at a specific and known location relative to those features via use of the stops 60. As such, a user is able to insert an implant in a specific spot within the intervertebral space. In a further form, stops 60 may also be formed as shoulders 64 on the minor sides 50. The stops 60 may be formed on a selectively positionable member (not shown) so that a user may adjust the position of the stops relative to the ultimate tip of the terminal portion, or position the angle of the stops 60 relative to the longitudinal axis of the cannula 14 allowing the stops 60 to accommodate the vertebral aspect shape.
After rotation of the terminal portion 42, the IDD 10 may be operated to advance an implant through the cannula 14 and into the intervertebral space. It should be noted that, should a user desire, the cannula 14 may be used to perform all modes of disc space preparation, such as a discectomy or nucleotomy or for a trial or sizing device, for instance, and as a minimally invasive surgical technique.
The cannula 14 may have a uniform shape or non-uniform shape in both the longitudinal direction and in cross-section. For instance, the rod 30 may be closely fit through a proximal section 14a of the cannula 14, thus serving as a guide to control the reciprocation of the rod 30. A cannula distal section 14b may have a different size or cross-sectional shape from that of the proximal section 14a so that the rod 30 passes easily therethrough.
In the preferred form, the distal section 14b has a cross-sectional shape corresponding to the shape of an implant. This cross-sectional surface shape may include additional features or projections, such as ribs or rails, that further guide or orient the implant into a predetermined position. As can be seen in
Notably, the cross-sectional shape of the distal section 14b corresponds to, but need not be identical to, the cross-sectional shape of an implant. In use, once the terminal portion 42 has been rotated to distract the vertebrae, the cannula distal section 14b may taper inwardly, prior to the implant being advanced through the cannula distal section 14b by the rod 30. In this position, the terminal portion 42 generally remains in the somewhat compressed state due to the insertion and distraction process, both in the direction of the minor dimension 44 as friction and pressure between the terminal portion 42 and the vertebral endplates does not generally permit normal, elastic return to a natural position, and in the direction of the major dimension as the vertebrae exert a compressive force on the minor sides 50.
The distal section 14b is expanded by the advancing implant. As the implant is forced through the distal section 14b by the rod 30, the major sides 52 are forced laterally outwardly. In some forms, the minor sides 50 are also forced outwardly (superior-inferior direction, rostral-caudal direction) to provide additional distraction. Again, expansion and contraction of the distal section 14b is permitted by the slots 70.
As described, the distal section 14b acts somewhat as a guide rail. Discussed above, the stops 60 provide a user with a known or ascertainable starting position, relative to the vertebrae. The close-fit and co-operation of the distal section 14b with the implant shape allow a user to have a definite knowledge of where and in what orientation the implant exits the cannula 14. Again, the use of the above-described targeting device/sizer and/or graduated markings on the rod 30 also help the user locate the implant at a known position.
After the initial implant or implant component has exited from the distal section 14b and into intervertebral space, a multitude of subsequent components may be delivered into the intervertebral space in a similar fashion, trailing the initial component, and forcibly driven together into a final assembly by the rod 30 or rods. Throughout this sequential process, the distal section 14b is ready for further implants or implant material. The distal section 14b likely compresses somewhat in the rostral-caudal direction (shortening the major dimension 44 by compressing the slots 70 thereof). The distal section 14b may or may not compress in the lateral direction (e.g., for shortening the minor dimension 46) due to residual force thereon from the endplates. The rod 30 or rods may be retracted or withdrawn so that its leading end is clear of the loading chamber 24 and received in the cannula proximal section 14a. A subsequent implant or implant material may then be loaded into the loading chamber 24 for advancement into the intervertebral space via a second advancement of the rod 30. Such allows additional implantation without requiring removal or re-insertion of the IDD 10, in contrast to other known devices described, for example, in U.S. Pat. Nos. 3,486,505 and 6,368,325 and U.S. Patent Application Publication No. 2008/0161817, which are each incorporated herein in their entirety. Furthermore, the placement of multiple implant components in the chamber, placed one behind the other, or placed side-by-side, allows the rod 30 or rods to deliver implants to the intervertebral space in a simultaneous and or sequential fashion. For instance, implants that are constructed of simultaneously or sequentially inserted components or adjustable components are advantageously accommodated by the IDD 10, as well as fusion procedures in which graft material may be subsequently packed into the intervertebral space and/or into cavities formed in and around the implant itself.
The IDD 10 is designed to protect, or avoid, adjacent tissues including neural tissues. Prior to and during initial insertion of the IDD 10, a sheath or skirt 77 is positioned around the terminal portion 42. The skirt 77 prevents or limits the ability for tissues to be caught by the slots 70 or the stops 60. In various exemplary forms, the skirt 77 may then be retracted to expose the slots 70 and stops 60, and/or the skirt 77 may be positioned to extend rearwardly from the stops 60 or simply expand to accommodate the expansion of the slots 70 when an implant is advanced through the distal section 14b of the cannula 14.
As illustrated, the IDD 10 is operated in a pistol-trigger fashion, though a rotating knob (not shown) or other actuator type may be employed. As can be seen in
Initial advancement of the rod 30 may be manually, such as by simply forcing the rod 30 forward by applying force to the end thereof protruding from the barrel 20. Once force is required, the trigger 82 may be employed. The engagement between the trigger rod end 82b and the rod 30 is such to permit slipping therebetween when the rod 30 is being advanced forward relative to the trigger 82. In one form, the trigger rod end 82b and the rod 30 may frictionally engage, while in another form the rod 30 may have a series of notches (not shown) that act in a ratchet manner with the trigger rod end 82b, though other mechanisms may be employed.
In a preferred form, the IDD 10 is easily cleaned and sterilized. To facilitate removal of particulate matter, the IDD 10 may be disassembled by removing a pivot pin 84 for the trigger 82 and removing the barrel 20 from the grip 80. The rod 30 may also be removable through the cannula proximal section 14a and the skirt 77 being removable from either end of the barrel 20.
The implants may be any type of partial or total disc replacement implant, and may be any type of implant such as natural or artificial bone graft material, fusion boxes or cages, expandable devices, sequentially-constructed devices, hydrogel- or hydrophilic-based devices, or others made of metallic, polymeric, elastomeric, ceramic, materials, or combinations of these types.
In one form, the IDD 10 may be secured with a spinal fixation system such as a pedicle screw installed on a vertebrae prior to use of the IDD 10. This promotes maintaining the IDD 10 in the selected and desired position determined by the user during use of the trial or targeting devices, discussed above, for instance.
It should be noted that the operative end 12 and terminal portion 42 may have a variety of exterior or surface configurations. The terminal portion 42 has been illustrated and impliedly discussed as being generally rectangular, as shown for
A second form of an inserter/distractor device or IDD 100 is illustrated in
In the illustrated form, the IDD 100 includes an outer member 120 somewhat in the form of a sleeve having a cannula 122. The outer member 120 may include stops 60 for providing a predetermined or known position relative to the vertebrae. A leading end 124 is positioned between the vertebrae, up to the stops 60. After the initial insertion of the leading end, an inner member 130 is moved relative to the outer member 120 to expand the outer member 120. More specifically, the outer member 120 is illustrated as having a somewhat quadrilateral shape, similar to that of IDD 10, with rostral-caudal sides 126 corresponding to a lateral dimension (into the plane of
In the illustrated form, the inner member 130 is a partial sleeve, having a sleeve-like body portion 132 closely received within the outer sleeve cannula 122 and having forwardly or distally extending arms 134. The arms 134 each have a small wedge 136 facing outward and engaged in respective minor side slots 121, which themselves may have angled surfaces 121a as shown in
There are a number of variations on the IDD 100. For instance, the shapes of the wedge 136 and slot 121 could be reversed so that advancing the inner member 130 (as opposed retracting, as discussed) forces the slots 121 to widen. The inner member 130 may be simply the pair of arms 134, without the body portion 132, or the body portion may be some other type of bridge allowing the arms 134 to be manipulated jointly. In another form, the inner member 130 may be entirely sleeve-like through the portion of the IDD 100 that the implant would pass, but for the wedges 136 protruding therefrom. In another form, the rod 30 may be connected to the inner member 130 so that, either prior to or in combination with the implant reaching the distal-most portion of the IDD 100, movement of the rod 30 causes the wedges 136 to shift and widen the slots 121 to expand the IDD 100.
These forms of the IDD 100 have distinct benefits over the prior art. For instance, the construction of the IDD 100 minimizes the amount of distraction that is necessary for an implant to pass therethrough. As the wedges 136 are to the lateral sides 128 (in the lateral direction), the amount of rostral-caudal distraction need not accommodate the wedges 136 nor, in a number of described forms, the inner member 130. This is in contrast to the design of the distractor/implantor illustrated by U.S. Patent Application Publication No. 2007/0270875, to Bacher, et al, which is incorporated by reference herein in its entirety. The distractor/implantor described by Bacher requires a significant amount of distraction simply to allow the distractor components to remain between the vertebrae as the implant passes therethrough. Movement of the wedges 136 can also be calibrated so that a particular amount of retraction of the inner member 130 corresponds to a known amount of distraction.
In some forms, the slots 121 and wedges 136 may cooperate to form stops 150 for maintaining the wedges 136 in a desired position.
It should also be noted that the slots 121 may have a varying contour for more controlled distraction. That is, as the distraction at the distal-most end of the IDD 100 is based on an angular opening of the slots 121, the geometry of the wedges 136 and slots 121 may be designed so that equal amounts of movement of the wedges 136 along the slots results in equal amounts of gross distraction for the IDD 100.
According to another embodiment of the present disclosure, a surgical device 200 is shown in
Referring now to
According to one embodiment, the advancement of rod 230 in barrel 220 causes distraction of barrel. The use of ratcheting mechanism 270 permits the advancement of rod 230 to occur in a sequential and predetermined manner. In one embodiment, rod 230 may be tapered to achieve the desired level of distraction and the predetermined stages of advancement within barrel 220. In one embodiment, ratchet elements 273, 275 are operable by use of trigger 282 and serve in part to secure rod 230 in the proper location relative to barrel for each sequential stage of advancement. In another embodiment, the ratchet elements 273, 275 may be selectively engaged or released from the rod 230 at the user's preference.
According to yet another embodiment, the rod 230 may be substituted with multiple rods or dilators. In one embodiment, the dilators are tapered and cause distraction of barrel 220 as dilators are advanced into barrel 220 as described above in relation to
Various stages of advancement of rod 230 relative to barrel 220 are shown in
According to one embodiment, the surgical device may further include one or more serial dilation rods, such as those shown in
Referring now to
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According to one particular embodiment, the slider 313 may include a plurality of apertures, which permit the legs 315 of access portal 310 to slide therethrough. In one embodiment, the legs 315 are pivotally interconnected to a linkage 317. Accordingly, as a user pushes or pulls operative end 311 of access portal 310, the legs 315 are opened or closed relative to the position of slider 313 about the longitudinal axis of legs 315. In yet another embodiment, the access portal 310 may comprise a collar or ring to maintain distraction although access portal 310 may be removed or adjusted, for example, to achieve a different degree of distraction. In yet another embodiment, the access portal may be actuated by an existing power supply as opposed to manually actuated. Further illustration of the access portal 310 is shown in connection with
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Rod 399 may further comprise one or more indicia (not shown) to allow a user to visually determine the depth or advancement of rod 399 within barrel 320. In other embodiments, the rod 399 may further comprise ribs, threading, or other surface irregularities that provide a hard stop, preventing advancement of rod 399 beyond a desired location. In yet other embodiments, the surface irregularities may further facilitate rotation of rod 399 within barrel 320, such as by providing a threaded surface of rod 399 corresponding to a threaded interior surface of barrel 320.
Referring now to
In one embodiment, surgical device 300 may be comprised of a material that permits impaction on the operative end of the device, for example with a mallet. In another embodiment, the rod 399 has an operative end 397 that is configured to receive an instrument to achieve delivery of a corresponding implant I, such as, but not limited to a mallet. Various views of components for the surgical device 300 according to this embodiment are shown in an unassembled state in
Referring now to
The surgical device 400 preferably provides independent distraction on each lateral side of the barrel 410. The positioning and manipulation of arms 442, 444 also permits a user to adjust the location of the port (or distal end of the aperture 426) laterally relative to the intervertebral space shown in
Detailed views of the surgical device 400 are shown in
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Various detailed views of the ratcheting mechanism 420′ according to one embodiment are shown in
Referring to
According to another embodiment of the present disclosure, a surgical device 500 may comprise a barrel 520 and an adjustment shaft 510, which may be used to achieve distraction between two adjacent pedicle screws 511, 512. Referring now to
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Although the embodiments described herein are shown within adjustment shaft that may be rotated by manual force, embodiments of the present disclosure are contemplated for use with various powered apparatus which are known to those of ordinary skill in the art. Such power sources would include, but are not limited to, pneumatic and/or electric power sources.
Referring to
The access port 530 and/or sleeve 540 may be rigid, semi-rigid, or deformable to a desired shape and contour. The materials may vary for each and include but are not limited to metals, metal alloys and polymeric materials. The access port 530 and/or sleeve 540 allow for vertical compression and adjustment relative to the underlying surgical field, and facilitate retraction of and avoidance of contact with soft and sensitive tissue surrounding the surgical field. In combination with the surgical device 500, these components are well suited for placing materials in an intervertebral disc space and/or at a patient's laminar arch. The access port 530 and sleeve 540 are adjustable to accommodate a variety of different surgical procedures and/or implant materials.
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Although a specific form of adjustment and actuation is described above, it is expressly understood that other mechanisms may be incorporated without departing from the spirit of the present disclosure. For example, the distraction mechanism may be comprised or a worm gear, a rack and pinion assembly, a ratcheting assembly, a lever, a hydraulically-actuated assembly or by a electronically powered assembly.
Referring now to
The IDD 600 generally comprises a cannula 604, a distractor 608, and an expansion tube 612. As will be described in more detail below, the distractor 608 and expansion tube 612 are sized to be sequentially positioned within a bore of the cannula 604. Further, the distractor 608 and expansion tube 612 can be slidingly arranged within the cannula 604. As the interior component 608, 612 of IDD 600 are sequentially inserted into the cannula 604, the amount of distraction increases compared to the largest external dimensions of the cannula 604. Although illustrated in
Referring now to
The body 614 of the cannula may have a rectangular or round cross-section. However, other shapes of the body are contemplated, including a generally elliptical cross-section. In one embodiment, the body 614 includes at least one rounded longitudinal corners 615. The rounded corners 615 facilitate rotation of the IDD 600 between and against adjacent vertebrae. The radius of each corner 615 may be different.
The body 614 includes a generally hollow interior formed by a bore 617. The shape of the bore 617 may be substantially the same as the exterior shape of the body. However, in one embodiment, the cross-sectional shape of the hollow interior is different than the exterior shape of the body.
The body can have any predetermined length and width 648. In one embodiment, the width 648 of the body 614 is determined based on the size of an implant intended to be implanted by the IDD 600. In another embodiment, the length and width of the body are determined from the portion of the patient's anatomy involved in the surgical procedure.
The expanding tip 620 has a size and shape adapted to be inserted, or wedged, into a small or collapsed intervertebral disk space. The tip 620 generally includes two distraction plates 624 interconnected to the distal end 622 of the body. The plates 624 may be hingedly interconnected to the body. Accordingly, the plates can pivot from the closed state illustrated in
The plates 624 may have contacting surfaces that are adapted to substantially conform to a selected portion of a specific patient's anatomy. However, other shapes are contemplated. It will be appreciated that the plates may also have generic shapes adapted for use with any patient. In addition, the plates 624 may include indicia or graduations to indicate a depth of insertion between adjacent vertebrae of the patient.
The handle 616 is secured to the body 614 of the cannula and has a shape selected to facilitate grasping and rotation of the IDD 600 during a surgical procedure. A manual or mechanical impact force may be applied to the handle to push the tip 620 of the cannula between the adjacent vertebrae. Accordingly, in one embodiment of the present invention the handle 616 and other portions of the cannula are sufficiently rigid to receive an impact force from a hammer or other impact device.
The handle 616 may have a shape or indicia to help orient the IDD 600 and the tip 620 with respect to the patient's anatomy to ensure the IDD 600 is in a predetermined orientation and position. In one embodiment, the indicia comprise letters or symbols that indicate a portion of the patient's anatomy targeted by the IDD 600. In another embodiment, the shape of the handle or the indicia indicate a reference orientation for alignment with respect to a portion of the patient's anatomy.
Referring now to
The distracting blocks 628 are located on the distal end 622 of the armatures 630. In one embodiment, the distracting blocks 628 have an exterior shape that substantially matches the shape of the bore 617 of the cannula 604. The blocks 628 may include radiused corners 615 to facilitate rotation of the blocks between and against the adjacent vertebrae. One or more of the corners 615 may have a different radius compared to the other corners. Optionally, the radiused corners 615 may serve as keys to mate with internal features of the cannula bore 617. In this manner, the distractor 608 can only be inserted into the cannula when in a predetermined orientation.
Although the blocks 628 are illustrated with a generally rectangular cross-section, it will be appreciated by one of skill in the art that the blocks 628 may have any shape determined to facilitate distraction of adjacent vertebrae. Accordingly, the shape of the blocks 628 may determine the shape of the cannula bore 617. Further, distraction block 628A may have a different size and shape compared to distraction block 628B. In one embodiment, the shape of each distraction block 628A, 628B includes different patient contacting surfaces adapted to align with different portions of the patient's anatomy. Providing patient-matched surfaces on the blocks 628 may help orient the IDD 600 and ensure that the IDD 600 is being docked off appropriate anatomy of the patient. In a different embodiment, the shape of at least one of the distraction blocks 628 is selected to align the distractor 608 in a predetermined orientation with the cannula 604 to facilitate proper use of the IDD 600. The distractor blocks 608 may also have a dimension selected to achieve a predetermined amount of distraction of adjacent vertebrae. However, it is contemplated that the blocks 628 may have a generic shape adapted to align the IDD 600 with a specific anatomical feature of any patient.
Any number of distractor blocks can be used with the distractor of the present invention although only two distractor blocks are illustrated. For example, in one embodiment, the distractor may include four distractor blocks with two blocks positioned distally in front of two blocks that are positioned more toward the proximal end 618. Each of the four blocks may have a decreased size compared to the size of the two distractor blocks 628A, 628B. Accordingly, the four distractor blocks may be advanced sequentially in pairs to incrementally distract the adjacent vertebrae.
When the distractor 608 is inserted into the cannula 604, the distal end 629 of the blocks 628 presses against an interior surface of the distractor plates 624. As the distractor is pressed distally, the blocks 628 move the distractor plates 624 to an open position (illustrated in
The distractor handle 632 may have the same general size and shape of the cannula handle 616. In one embodiment, the distractor handle comprises two portions 632A, 632B associated with each of the armatures 630A, 630B. The handle portions 632A, 632B can be separated radially to enable the expansion tube 612 to fit within the cannula bore 617 between the armatures 630. The handle 632 may also be sufficiently durable to receive an impact force from an impact device such as a hammer.
The distractor handle 632 may include indicia similar to the indicia of the cannula handle. For example, indicia of the distractor handle 632 may indicate a direction of intended rotation to ensure planned distraction of adjacent vertebrae. The indicia may also indicate an intended orientation of the distractor 608 for proper insertion within the cannula 604. Optionally, in one embodiment, the distractor handle 632 is adapted to interconnect to the cannula handle 616 to prevent unintended or inadvertent movement of the distractor 608 within the cannula bore 617. In another embodiment, the distractor handle 632 may include a latch or lever operable to advance the blocks 628 within the cannula bore 617 to force open the distraction plates 624 of the cannula. Optionally, the cannula 604 may include a ratchet to move the distractor 608 to the distal end. Further, in one embodiment, the IDD 600 is adapted for use with device 200. Accordingly, the IDD 600 may be inserted through barrel 220 and each of the cannula 604, distractor 608 and expansion tube 612 advanced using the trigger 282 of device 200.
Referring now to
The shaft has an exterior shape substantially conforming to the cannula bore 617 after insertion of the distractor 608 into the cannula. An exterior surface of the shaft 636 may be keyed to align with the distractor armatures 630. In one embodiment, the key is a recess 638 formed on at least one surface of the shaft.
The shaft includes a hollow bore 642. The bore 642 has a size and shape adapted to receive an intervertebral implant. In one embodiment, the bore 642 includes a protrusion 644 to mate with the implant and/or specific instruments, such as any of the rods 30 described above, used to prepare the disk space and or deliver implants or bone grafts. In another embodiment, two protrusions 644 may form a slot 643 (best seen in
Referring now to
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Optionally, after distractor 608 is inserted into the cannula bore 617 and the blocks bilaterally extended as illustrated in
It will be appreciated that in one embodiment of the present invention, a distractor 608A with a single block 628A may be inserted through the cannula bore to provide a different amount of distraction. In this embodiment, when the expansion tube is pressed into the cannula bore, the single block 628A would extend out radially similar to the bilateral extension of blocks 628A, 628B illustrated in
Optionally, the IDD 600 includes a lock mechanism to fix the distractor blocks 628A, 628B in the radially extended position. After the lock mechanism is engaged, the tube 612 may be removed from the bore of the cannula 604 and the distractor blocks 628A, 628B will be retained in the extended position. In this manner, bore of the cannula can be used to insert an implant between the vertebrae. This may be beneficial for some procedures as the bore of the cannula 604 has a greater internal width than the bore 642 of the tube 612.
Referring to
As shown in
The modules 701-706 may have a variety of shapes and sizes. The modules may optionally include exterior surfaces that are generally smooth and without protrusions to facilitate passage of the device 700 through the disc space during implantation. Exterior surfaces 732 of the modules facing the distal end 726 of the device are generally rounded with a convex or arcuate distal surface. Surfaces 730 of the modules facing radially inward may include perforations or webbing to receive bone growth material to promote fusion of adjacent vertebrae. Optionally, surfaces of the device may include apertures 734, illustrated in
In one embodiment, the modules have shapes selected to nest together when the surgical device is in the insertion configuration, as illustrated in
The shape of each module may be selected to facilitate assessment of the alignment of the device by use of medical imaging devices. For example, one or more of the modules may have a non-uniform shape to identify the orientation of the device 700 within the disc space. In addition, radiographic markers may be positioned at a variety of locations on the modules to facilitate assessment of the location and orientation of the implant in the disc space. The markers may be of any type viewable by medical imaging devices, such as an X-ray apparatus.
The modules may also include shapes and surfaces used to distract adjacent vertebrae. For example, the modules may include a tapered shape that can be used to distract the vertebrae for receiving the surgical device. In one embodiment, the modules 701-706 have a substantially uniform thickness 715, as illustrated in
Optionally, the exterior surfaces 732 of the modules may be adapted to engage surfaces of the adjacent vertebrae. For example, in one embodiment, the modules include groves, ridges, spikes, or other protrusions to resist unintended movement or migration of the device within the vertebral space. Any of the modules can have exterior surfaces that are patient specific. The patient specific surfaces include contours selected to substantially conform to a predetermined portion of the patient's anatomy. Accordingly, the modules can include exterior surfaces with shapes adapted to fit to a specific location within the intervertebral space.
The armatures are moveable with respect to the primary module 701. In one embodiment, the primary module 701 comprises apertures or slots for receiving adjustable armatures 707-709, and according to this embodiment one or more adjustable armatures 707-709 may be moved through slots to achieve a variety of desired configurations. Positioning of the modules may be achieved in a variety of configurations by movement of the one or more adjustable armatures. For example, in this embodiment two modules 703, 704 are connected by one adjustable armature 708 and two different modules 705, 706 are connected by a different adjustable armature 709. One additional module 702 is connected to yet another armature 707. Positioning of armatures 707-709 relative to the primary module 701 determines the position of the respective modules 702-706 associated with the adjustable armatures 707-709.
In one embodiment, the armatures 707-709 may be adjustable by translation relative to one or more modules, such as the primary module 701 shown in
In
Other types of adjustment are contemplated and described in alternate embodiments below. Armatures may be advanced or retracted by manipulation of a tool used to insert the surgical device 700 into the vertebral space. The adjustability of the armatures can be controlled to selectively expand or contract of the surgical device 700 to a specific position or size. In one embodiment, an adjustment mechanism may be manipulated to advance or retract one or more of the armatures 707-709. The armatures can be adjusted independently or as a group. In one embodiment, the adjustment mechanism is an internal screw, such as a set screw, operable to manipulate the armatures. The internal screw may have any thread type with any desired pitch. In one embodiment, the threads of the screw are calibrated such that each rotation of the screw advances or retracts the armatures a predetermined amount. In another embodiment, the threads of the screw engage threads formed on a portion of the armatures. As the screw is rotated, the threads of the armatures advance or withdraw the armatures from the primary module 701. In another embodiment, the position of one or more of the armatures is adjusted by a rack and pinion type connection between the primary module and the armatures. The connection is made by a plurality of slots on the armatures and gears or teeth of the primary module. As the adjustment mechanism is manipulated, the teeth of the primary module engage the slots of the armatures to change the position of the armatures with respect to the primary module. In one embodiment, the rack and pinion connection is operable to move each module axially and/or radially. In one embodiment, the adjustment mechanism is associated with the engagement portion 720 described below. In another embodiment, the engagement portion 720 can be actuated by a rod of an IDD 10, 110 to advance one or more distal modules 702, 704, 706 to distract the adjacent vertebrae.
In one embodiment, different internal screws are associated with each armature 707-709, each screw adapted to independently advance or retract a respective armature. In another embodiment, illustrated in
In one embodiment, stops may be provided on armatures 707-709 to limit the amount of movement of the armatures with respect to the primary module 701. Additionally or alternatively, the armatures may include means to indicate a relative movement of the armatures through the slots of the primary module 701 as the armatures are advanced or withdrawn. In one embodiment, the means to indicate comprises indicia provided on portions of the armatures 707-709. In one embodiment, the indicia comprise a series of marks forming a graduated scale. In another embodiment, the means to indicate comprises detents. As the armatures are adjusted, the detents may provide feedback to the operator, such as an audible click or tactile vibration. In still another embodiment, the means to indicate are discernible by a medical imaging device. In another embodiment, the means to indicate are embedded within or applied to the surface of the surgical device 700 and the means to indicate are made of a material that is discernible by the medical imaging device. In still another embodiment, the means to indicate include radiolucent materials.
During insertion of the surgical device 700, the device width 714 dimension is aligned generally perpendicular to the general plane of the natural disc and the intervertebral space (which is generally horizontal in an erect human, transverse to the longitudinal extent of the spine). Thus, in the configuration illustrated in
Once the surgical device has been inserted into the intervertebral space, the device may be rotated so that the device width 714 dimension is aligned generally parallel to the general plane of the natural disc and the intervertebral space. The adjustable armatures 707-709 may then be adjusted based on surgeon preference or patient anatomy until the desired configuration is achieved. In one embodiment, the final or deployed configuration will be secured by a tool, which may be used to affix the adjustable armatures in the desired location relative to the primary module 701. In another embodiment, the surgical device is operable to retain the adjustable armatures in the deployed configuration. For example, in one embodiment, surgical device includes a lock means. The lock means may comprise any structure suitable to prevent unintended or inadvertent movement of the adjustable armatures. In one embodiment, the lock means comprises detents that are biased to extend into voids to prevent the adjustable armatures from moving from the deployed configuration. In another embodiment, the lock means comprises a fixture 724 that applies a force to the armatures as illustrated in
Modules are preferably made of one of the materials described above. Adjustable armatures may also be comprised of the materials described above, however, in a preferred embodiment the armatures are comprised of a material known as Nitinol or an alternative material having similar properties as Nitinol. As will be appreciated by one of skill in the art, adjustable armatures made of Nitinol may be at least partially flexible, allowing the surgeon to reshape the surgical device during the surgical procedure without damaging the adjustable armatures. Adjustable armatures made of Nitinol have shape memory and can be formed into and hold a shape better than armatures made of other materials. In these embodiments, the critical temperature of the Nitinol used to form the armatures may be selected to be less than a temperature in an operative environment for the surgical device. A desired shape for each adjustable armature is memorized for temperatures above the critical temperature so that the desired shape of each adjustable armature is restored during use when the surgical device 700 is implanted. In certain embodiments, the critical temperature is selected to be less than a body temperature of the patient.
For example, by selecting a transition temperature of the Nitinol of the adjustable armatures to be below room temperature, the adjustable armatures can have superelastic properties. Thus, it will be understood by those of skill in the art that one or more of the adjustable armatures of the surgical device may be bent or the shape of the armature adjusted during the surgical procedure for an indefinite period of time without permanent deformation. In use, after the surgical device is implanted into the patient's body, the temperature of the adjustable armatures will increase above the critical temperature returning the adjustable armatures to their original shapes.
Adjustable armatures are preferably smaller in dimension than modules, and in a final placement or deployed configuration permit a surgeon or other medical professional to place bone graft and/or other bone growth material around the armatures for facilitating fusion between the adjacent vertebral bodies. In the embodiments described herein, a greater amount of bone graft or bone growth material may be placed around the surgical device when it is in the deployed configuration than with other prior art surgical devices.
Cannulae or cutaway features may be present in one or all of the modules through which surgeons place graft material throughout the construct. For example, in one embodiment, the modules 702-706 include channels or bores operable to conduct graft material from a surgical tool, such as a syringe, to exterior surfaces of the modules. In one embodiment, the modules may include a plurality of bores to receive graft material. Thus, the modules of one embodiment may comprise a rigid sponge structure to promote, or benefit from, bone in-growth in the intervertebral space. In still another embodiment, the adjustable armatures 707-709 include hollow bores that communicate with apertures 734 in the modules 702-706. In this embodiment, the surgeon may inject graft material into an aperture 720 in one of the modules, such as the primary module 701, which then flows through the armatures and out of the apertures 734 of modules 702-706.
Referring now to
In one embodiment of the present invention, the surgical device is deployed with a connection member 724 pre-positioned in the aperture 720 in a disengaged position. After the surgical device 700 is positioned in the intervertebral space and the adjustable armatures moved to their deployed configuration, the connection member is moved to an engaged position. Moving the connection member to the engaged position may comprise rotating the connection member to cause a distal portion of the connection member to apply a force to the adjustable armatures 708, 709. In another embodiment, moving the connection member may comprise pushing the connection member further into the surgical device 700 to contact the adjustable armatures. For example, the connection member may be biased in a disengaged position. Pushing the connection member inward moves the connection member to the engaged position to prevent movement of the armatures.
Although illustrated with the surgical device 700, it will be appreciated by one of skill in the art that all embodiments of the surgical devices of the present invention described herein may include an aperture adapted to receive a fixture device or other connection member to secure the adjustable armatures in a predetermined position. Other similar connection members are contemplated for use with the present disclosure.
The engaging portion 720 may also be used for loading implant material or bone growth material into the intervertebral space. The engaging portion may communicate by bores to a variety of apertures 734 (illustrated in
According to this embodiment, armatures 807-809 are preferably comprised of Nitinol or a similar material. The material properties of the armatures permit the armatures to bend and deflect a significant amount, without compromising their original shape or failing due to shear forces. Here, the surgical devices may be placed in an initial or insertion configuration by manipulating the armatures as shown in
This substantially hollow body 1001 permits placement of bone graft or other bone growth material and decreases the weight and cost of manufacturing the surgical device 1000. This embodiment also facilitates location of the primary module 1001 when viewed by radiographic or other similar imaging, and in turn makes it easier for a surgeon to verify the proper placement of the surgical device. Other known techniques, such as the placement of one or more radiographic markers along the surfaces of modules 1001-1005 or armatures 1008-1009 may also be incorporated with the various embodiments described herein to facilitate final placement of the surgical device.
Each of the modules 1101-1105 has a unique shape and size. The modules may have a shape and size selected based on the anatomy of a particular patient. The modules may also be tapered or sloped or otherwise contoured to facilitate insertion and manipulation, as best seen in the side elevation view of
Features of the surgical devices shown in
The components of this embodiment may further be comprised of a shape memory alloy, such as Nitinol, or other material comprising an ability to bend and yet retaining, or returning to, its original configuration. Alternatively, the components may be pre-formed and comprised of titanium or equivalent material.
Although the embodiments described above each use the term “primary module,” it is expressly understood that the surgical device may be provided without a primary module. Thus, this term is used merely for illustration and not to unduly limit the present disclosure.
In use, one or more instruments or tools may be employed to pull and shape the Nitinol armature 1507 through an aperture 1517 in the medial module 1501 in order to compress the surgical device. After the surgical device is in place, the insertion tool advances armature 1507 forward to deploy modules 1503, 1505 in a more posterior location relative to the disc space. This surgical device preferably has a central opening or void 1516 for receiving graft material. The void 1516 may have any shape. In one embodiment, the void 1516 has a shape that generally conforms to the exterior shape of the medial module 1501. Modules 1503, 1505 are preferably comprised of PEEK or an equivalent material.
In one embodiment, the threaded end 1619 is slightly wider than the remainder of armature 1609, and may be secured to the threaded opening (not shown) of module 1601. This permits the armature 1609 to become secured in a final or deployed configuration once the threads engage the threaded opening of module 1601. The surgical device also includes an aperture 1616 adapted to receive bone growth material and a profiled nose 1618. The profiled nose is formed by reducing the width 1614 and thickness 1615 of the modules 1601, 1605 at the distal end compared to the proximal end. An alternative embodiment of the surgical device 1600A is shown in
Referring now to
The surgical device described herein may be used in a minimally invasive setting, and may comprise one or more adjustable modules which may be assembled after delivery through a cannula or other minimally invasive passageway to the surgical site. Alternatively, one or more portions of an apparatus may be nested within another portion of the surgical device, or alternatively nested within an instrument or other device that is used to deliver the apparatus through a cannula, tube or other minimally-invasive portal.
The medial portions 1801 of surgical devices 1800, 1800A include upper 1801A and lower 1801B portions that are also preferably hollow with a void 1804. The void may have any shape. The shape of the medial portions 1801 and the void 1804 may be asymmetric. Further, the upper 1801A portion and upper void 1804 may have a different size and shape than the lower 1801B portion and lower void 1804B. In one embodiment, the void has a shape similar to the shape of the medial portion 1801. In one embodiment, devices 1800, 1800A are adapted to flex or compress in response in response to movement of the adjacent vertebrae. In another embodiment, devices 1800, 1800A are substantially rigid and resist or prevent compression. In this embodiment, webbing or transverse support elements may be positioned between the upper and lower portions of the medial portion 1801 and the armatures 1803.
The lengths of armatures 1803 may be such that the medial portion 1801 of each surgical device is placed substantially in the central portion of the disc space and the armatures extend only to the outer edge of the adjacent vertebrae, as best shown in
The armatures 1803 may include projections 1802 that provide additional stability and improved fit of the surgical device 1800 by slightly wrapping around the outer edge of adjacent vertebrae V, as illustrated in
The surgical devices 1800, 1800A may be comprised of any of the materials described above. In one embodiment, the armatures 1803 are made of a flexible material. Thus, the armatures 1803 may be bent or reshaped during insertion of the surgical devices 1800, 1800A in the intervertebral space. In another embodiment, the armatures 1803 are made of Nitinol or another material with shape memory. In one embodiment, the armatures 1803 may be flexible axially. In this manner, the distance of the projections 1802 from the medial portion 1801 may be at least temporarily decreased. This may aid insertion of the device 1801, 1800A into the intervertebral space.
The size and shape of the surgical devices and armatures described above and illustrated in
The surgical devices 700-1900 may then be fabricated by any method. Fabrication methods may comprise the use of a rapid prototyping machine, such as a stereolithography (STL) machine, selective laser sintering (SLS) machine, or a fused deposition modeling (FDM) machine, direct metal laser sintering (DMLS), electron beam melting (EBM) machine, or other additive manufacturing machine.
Embodiments of the present disclosure present several advantages over the prior art including, for example, the speed and efficacy of the procedure, the minimally invasive aspects of the procedure, the disposability of the prototype devices, the ability to introduce implants to the surgical site with minimal risk and damage to the surrounding tissue, lower risk of infection, more optimally placed and/or oriented devices, a more stable and controlled method of placing and inserting of a surgical device, further reducing the likelihood of the apparatus becoming misaligned or dislodged, and fewer and/or less expensive tools and instruments in a surgical site, among other advantages. For example, the embodiments reduce the number and need for multiple trays, instruments and different size devices used in a particular surgery, thereby reducing the cost of the equipment necessary to complete the surgery.
According to another alternative embodiment, the system and method may comprise providing the data set(s) to a CNC machine, which in turn may be utilized to manufacture a custom milled apparatus from one of the more mechanically sound materials listed above. In yet another alternative embodiment, volume manufacturing of apparatus in accordance with the embodiments described herein may also be achieved, for example, where a particular orientation or insertion trajectory is common among a large grouping of patients.
To add further stability to the seating and placement of the surgical devices described herein to the patient anatomy, the modules may further comprise one or more spikes or teeth or other surface features, which serve to contact and at least partially penetrate or “grip” the patient anatomy to secure the implant in place. In one embodiment, the surface features may be made of the same material and may be permanently attached to the modules. In another embodiment, the surface features may be comprised of an overlay, and/or may be made of a different material, such as the ones described herein, and may further be selectively inserted onto one or more of the modules as desired.
According to further embodiments of the present disclosure, the patient contacting surfaces, formed on the modules, including one or more protrusions extending from the primary modules 701-1901 of the surgical devices described in greater detail above (and according to several embodiments disclosed herein) may comprise a sharp or semi-sharp contacting edge for penetrating and affixing to the patient's anatomical feature. This is particularly important for spinal surgical procedures where the precise location of the patient contacting surface must be within a small degree of error, and must remain permanent throughout the procedure.
In one embodiment, the surgical devices described above may be matched to an anatomic feature of a patient that has degenerated and needs to be restored. In another embodiment, the surgical device may be necessary to correct structural or physiological deformities present in the patient anatomy, and thereby serve to correct position or alignment of the patient anatomy. Other implants may be patient specific but do not serve a restorative or other structural function (i.e., a hearing aid implant casing).
The surgical devices described herein may be manufactured via additive manufacturing. In the context of spinal implants, the surgical devices may be used in all approaches (anterior, direct lateral, transforaminal, posterior, posterior lateral, direct lateral posterior, etc). Specific features of the surgical device can address certain surgical objectives, for example restoring lordosis, restoring disc height, restoring sagittal or coronal balance, etc.
Other applications contemplated by the present disclosure include interbody fusion implants, disc space height restoration implants, implants having footprint matching, surface area maximization, shape and contour matching to endplates or other vertebral defects, and may further specify the contact surface such as the relative degree of roughness or other surface features. For example, an implant may be fabricated based on the patient anatomy which further comprises a direction-specific shape, such that the implant may fit through an access portal and into the disc space without difficulty. Alternatively, the implant may be fabricated in a manner to account for anatomic constraints both at the point of implant and through the path the implant must travel, and may further compensate for anatomical defects. In the context of a spinal implant, the surgical device may further specify a desired angle of lordosis or coronal defect correction, specify a patient specific height of the implant or (desired height following disc height restoration), specify a degree of expansion permitted (for expandable implants), and may be unidirectional or multi-directional depending on the surgery and the surgeon preference.
According to various embodiments described herein, the surgical devices and associated fixation devices offer a significant improvement in implant design. In the disclosed design, an interbody fusion device may be placed from a bilateral posterior lumbar interbody fusion (PLIF) or a unilateral tranforaminal lumbar interbody fusion (TLIF) approach, and may further become mechanically interlocked with a vertebral anchoring or fixation device. The fixation device may be, by way of example but not limitation, a modified vertebral pedicle screw. One or more surgical guides may be fabricated using patient data to provide a predictable and reproducible trajectory, and to ensure that the fixation devices inserted through the guide interlock with the interbody fusion device.
The apparatus disclosed herein may be made of a variety of different materials. These materials may include, by way of example but not limitation, stainless steel, titanium alloy, aluminum alloy, chromium alloy, and other metals or metal alloys. These materials may also include, for example, PEEK, carbon fiber, ABS plastic, polyurethane, resins, particularly fiber-encased resinous materials rubber, latex, synthetic rubber, synthetic materials, polymers, and natural materials.
According to one aspect of the present disclosure, the surgical devices 700-1800 described herein may be used with at least one instrument or tool for delivering and manipulating the implant.
The present disclosure may also be advantageous in light of recent improvements in decentralized manufacturing. For example, surgical devices may soon be capable of fabrication in a number of different and convenient settings, including but not limited to an off-site manufacturing location, an on-site manufacturing location, using equipment present in a surgeon's clinic or offices or in a public or private hospital. For example, modules may be fabricated based on a particular patient need and immediately fabricated once the need is identified, and then provided directly to the surgeon.
While various embodiment of the present disclosure have been described in detail, it is apparent that modifications and alterations of those embodiments will occur to those skilled in the art. However, it is to be expressly understood that such modifications and alterations are within the scope and spirit of the present disclosure, as set forth in the following claims. For further illustration, the information and materials supplied with the provisional and non-provisional patent applications from which this application claims priority are expressly made a part of this disclosure and incorporated by reference herein in their entirety.
It is expressly understood that where the term “patient” has been used to describe the various embodiments of the disclosure, the term should not be construed as limiting in any way. For instance, a patient could be either a human patient or an animal patient, and the apparatus and methods described herein apply equally to veterinary science as they would to surgical procedures performed on human anatomy. The apparatus and methods described herein therefore have application beyond surgical procedures used by spinal surgeons, and the concepts may be applied to other types of “patients” and procedures without departing from the spirit of the present disclosure.
The foregoing discussion of the disclosure has been presented for purposes of illustration and description. The foregoing is not intended to limit the disclosure to the form or forms disclosed herein. In the foregoing Detailed Description for example, various features of the disclosure are grouped together in one or more embodiments for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the following claims are hereby incorporated into this Detailed Description, with each claim standing on its own as a separate preferred embodiment of the disclosure.
Moreover, though the present disclosure has included description of one or more embodiments and certain variations and modifications, other variations and modifications are within the scope of the disclosure, e.g., as may be within the skill and knowledge of those in the art, after understanding the present disclosure. It is intended to obtain rights which include alternative embodiments to the extent permitted, including alternate, interchangeable and/or equivalent structures, functions, ranges or steps to those claimed, whether or not such alternate, interchangeable and/or equivalent structures, functions, ranges or steps are disclosed herein, and without intending to publicly dedicate any patentable subject matter. cm What is claimed is:
Claims
1. A spinal implant adapted for insertion in a space between adjacent vertebrae, comprising:
- a primary module;
- a first adjustable armature and a second adjustable armature each interconnected to the primary module, the first and second adjustable armatures each associated with a bore through the primary module and each including a proximal end with a proximal module and a distal end with a distal module;
- wherein the first and second adjustable armatures are configured to move in relation to the primary module to change positions of the proximal and distal modules; and
- wherein the proximal modules are positioned on a first side of the primary module and the distal modules are positioned on a second side of the primary module, opposite to the first side of the primary module.
2. The spinal implant of claim 1, wherein the first and second armatures are formed of a flexible material.
3. The spinal implant of claim 1, wherein the first and second armatures are formed of a shape memory material.
4. The spinal implant of claim 1, wherein at least one of the first and second armatures is substantially linear.
5. The spinal implant of claim 1, wherein at least one of the first and second armatures has a generally arcuate shape.
6. The spinal implant of claim 1, wherein at least a portion of each of the distal modules is thinner than the primary module.
7. The spinal implant of claim 1, further comprising a void in the primary module, wherein the void is adapted to receive implant material.
8. The spinal implant of claim 1, wherein each of the proximal and distal modules are selectively connectable to the respective first and second adjustable armatures.
9. The spinal implant of claim 1, wherein the bores through the primary module are cylindrical.
10. The spinal implant of claim 1, further comprising a locking mechanism to maintain the first and second adjustable armatures in a desired position.
11. The spinal implant of claim 10, wherein the implant comprises an aperture located in the primary module and adjacent at least one of the first and second adjustable armatures, and wherein the aperture is adapted to receive a threaded fixture that can be rotated to apply a force to the at least one of the first and second adjustable armatures to prevent movement of the at least one adjustable armature relative to the primary module.
12. The spinal implant of claim 1, wherein one or more of the proximal and distal modules comprise a tapered leading edge.
13. The spinal implant of claim 1, wherein the implant has an initial or insertion configuration with a first width sized to be received between the adjacent vertebrae.
14. The spinal implant of claim 13, wherein the implant has a second or deployed configuration with a second width that is greater than the first width.
Type: Application
Filed: Dec 20, 2018
Publication Date: May 2, 2019
Inventors: George Frey (Englewood, CO), Caleb Voelkel (Lakewood, CO), Greg Kana (Denver, CO), Geoff Lai (Lakewood, CO)
Application Number: 16/228,124
