Variable Pitch Thread Patents (Class 606/317)
  • Patent number: 9980759
    Abstract: The present bone implant is a cannulated screw/nail or combination having end, middle and head threads as well as unthreaded portions along the length of the shaft. The pitch of the head threads is always less than the middle threads. Variations include a two-part construction with a narrow protrusion having narrow-protrusion threads of opposite hand, or the inclusion of at least first middle threads and second middle threads of different pitch. The implant provides bone compression engineering heretofore unavailable with prior known compression screws.
    Type: Grant
    Filed: September 10, 2012
    Date of Patent: May 29, 2018
    Assignee: Vilex in Tennessee, Inc.
    Inventor: Abraham Lavi
  • Publication number: 20150105830
    Abstract: A bone screw is provided including a longitudinal core member having a longitudinal axis defining a longitudinal direction and having an outer surface and a helical groove in the outer surface, the groove being defined by opposed sidewalls; and a helical thread body configured to be accommodated in the groove. When the thread body is assembled in the groove of the core member and when the core member is straight, the thread body is configured to abut one opposed sidewall without abutting the other opposed sidewall along a full turn of the thread body, the thread body is configured to slide in the groove between the opposed sidewalls of the helical groove parallel to the longitudinal axis, and a first portion of the thread body that is outside the helical groove has a height greater than a second portion of the thread body that is in the helical groove.
    Type: Application
    Filed: October 9, 2014
    Publication date: April 16, 2015
    Inventors: Lutz Biedermann, Wilfried Matthis, Bernd Fischer
  • Patent number: 8992587
    Abstract: A surgical implant comprising a screw element having a screw head, a first thread having a first thread pitch, a second thread having a second thread pitch and an intermediate portion coupling the first and second thread pitches with the first and second thread pitches being different. The implant has a buttressing head associated with the first thread, and it is dimensioned to be larger than a diameter of the first threads to provide external buttressing as the first and second threads compress a first bone and a second bone together.
    Type: Grant
    Filed: July 18, 2011
    Date of Patent: March 31, 2015
    Assignee: X-spine Systems, Inc.
    Inventor: David Louis Kirschman
  • Patent number: 8945193
    Abstract: A system comprising a screw element having a generally cylindrical body having a bore or lumen therethrough and a plurality of fenestrations or windows through which biological material may be provided. The system comprises a tool for inserting the biological material into the screw element so that the biological material may extrude through the plurality of fenestrations or windows and through an aperture in the tip of the screw element thereby enabling providing a fusion mass across two adjacent facet bones or a facet joint wherein the screw itself provides both a fixation component and a screw component.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: February 3, 2015
    Assignee: X-spine Systems, Inc.
    Inventor: David Louis Kirschman
  • Patent number: 8715322
    Abstract: The present invention relates to a spine fixation device containing a set screw having a double spiral form. The spine fixation device is characterized by comprising: a pedicle fixation screw which has a head portion having a receiving groove of a certain depth formed thereinside and a plurality of female screws formed in one region of the inner circumference of the receiving groove, and a screw portion extended from one side of the head portion lengthwise and embedded into a pedicle, and is fixed to a damaged pedicle; a spine rod which is received in the receiving groove to connect the pedicle fixation screw, thereby realigning the angle and interval of the pedicle; and a set screw which forms a plurality of male screws with the same screw inner diameter, the same screw thread direction and different pitches, and is screw-coupled to the female screws of the pedicle fixation screw to prevent the movement of the rod received in the receiving groove.
    Type: Grant
    Filed: July 17, 2009
    Date of Patent: May 6, 2014
    Inventor: Min Seok Kim
  • Patent number: 8668726
    Abstract: A bone screw having a threaded proximal portion, a threaded median portion, and a threaded distal portion. The threaded proximal portion has a proximal thread with a constant diameter and a proximal pitch. The threaded median portion has a median thread with a constant diameter smaller than the diameter of the proximal thread and a median pitch that becomes increasingly smaller from a distal end of the threaded median portion towards a proximal end of the threaded median portion. The threaded distal portion has a distal thread having a constant diameter that is smaller than the diameter of the median thread and a distal pitch that is larger than the median pitch at the distal end of the threaded median portion.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: March 11, 2014
    Assignee: Small Bone Innovations International
    Inventor: Jean-Jacques Martin
  • Patent number: 8668725
    Abstract: A bone screw is provided for securing a medical device to bone. The bone screw can engage with a bone screw hole in a medical device, such as an anterior cervical plate or sternal closure plate. Embodiments of the bone screw can include a screw head, a smooth cylindrical shaft region, a first and a second cylindrical shaft region with external threading, a tapered shaft region with external threading and one or more recessed flutes, and a sharp tip without threading or fluting. The external threading in the first and the second cylindrical shaft regions can have different pitches and crests. The external threading on the tapered shaft region can be tapered.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: March 11, 2014
    Assignee: Southern Spine, LLC
    Inventors: Hugh F. Smisson, III, David C. Field, Paul Gombar, Jr., Walter R. Sanders, Brandi Bohleber
  • Patent number: 8636785
    Abstract: A bone screw (10) having a lead portion (12) and a tail portion (14), each comprising a root and a thread (22, 24) (having a thread lead) formed on the root. The thread on each of the lead and tail portions has an approximately constant diameter along a significant portion of its length. The diameter of the thread on the tail portion is greater than that of the thread on the lead portion, and in which the thread lead of the thread on the lead portion is equal to the thread lead of the thread on the tail portion. The screw can be used to achieve fixation to a vertebra with an anterior approach.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: January 28, 2014
    Assignee: Globus Medical, Inc.
    Inventors: Robert Hes, Bart Conix, Christopher Gowland
  • Patent number: 8579947
    Abstract: Present invention depicts a poly-porous (micropore) hollow screws as diffusion chamber filled with core matrix for targeted delivery of growth factors and bone marrow stem cells. The screws comprise at least two parts: the distal part of the screw consists of the tip of the screw made of poly porous material and hollow inside proximally. It has threaded navel attached to the threaded nipple of the distal part of the proximal screw which has the screw head and is made of the solid material of the same kind. The screw head had hexagonal recess targeted for screw driver insertion. Assembly of screw created a chamber in the middle of the screw. The chamber is filled with core matrix consisting of gelatin nano-particles pre-impregnated with BMPs (BMP2/BMP7 for bone or BMP12 for tendon, ligament) and fibrin sealants or Chitosan dispersed with bone marrow stem cells and/or other growth factors. Bioactive protein core material is prepared during the surgery and filled the chamber of the screw by the surgeon.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: November 12, 2013
    Inventor: Yangguan Wu
  • Publication number: 20130238036
    Abstract: A bone screw, for drawing first and second bone fragments together, includes a shaft having a distal section and a proximal section. The distal section has a first external male screw thread and a minor diameter. The proximal section has a second external male screw thread. A major diameter of the distal section is larger than a major diameter of the proximal section. The bone screw includes a sleeve that has an internal female screw thread configured to mate with the second male screw thread. A distal portion of the sleeve has an outer diameter. The outer diameter is equal to or smaller than the minor diameter of the distal section of the shaft.
    Type: Application
    Filed: November 29, 2011
    Publication date: September 12, 2013
    Applicant: GENOSSIS LLC
    Inventor: Amit Sinha
  • Patent number: 8419779
    Abstract: The present invention is a systematic displacement bone screw having minor and major thread diameters that are constant instead of tapered. The crests at the tip of the screw are narrower than the crests near the screw head resulting in a smaller distance between the thread flanks, which displaces and/or compresses more bone matter. Because the major diameter remains constant, the diameter of the hole made by inserting the screw is consistent over the length of the screw allowing the screw to be adjusted without loosening. The systematic displacement screw with varying crest thicknesses also avoids the need to use a larger diameter screw in place of a removed screw during a repair procedure. Rather than increasing the size of the hole, the systematic displacement screw can be used for the both the original screw and the replacement screw.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: April 16, 2013
    Inventor: James A. Rinner
  • Patent number: 8303634
    Abstract: A bone screw (1) having a threaded proximal portion (2), a threaded median portion (3), and a threaded distal portion (4). Threaded proximal portion (2) has a core (11) with a constant diameter and a proximal thread (12) with a constant diameter and a proximal pitch (P2). The threaded median portion (3) has a core (15), which is conical, with a diameter becoming increasingly larger from the distal end of the threaded median portion (3) to the proximal end thereof, and thread (16), which has a constant diameter smaller than the diameter of the thread (12) of the proximal threaded portion (2). The pitch of thread (16) of the threaded median portion (3) becomes increasingly smaller from the distal end of the threaded median portion (3) towards its proximal end. At the proximal end of the threaded median portion (3), the pitch of thread (16) is larger than the pitch (P2) of the thread (12) of the threaded proximal portion (2).
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: November 6, 2012
    Assignee: Small Bone Innovations International
    Inventor: Jean-Jacques Martin
  • Patent number: 8162998
    Abstract: The invention concerns a bone screw having a distal end and a proximal end, which has the distinguishing features a shaft with a core diameter “k” and having an external thread with an external diameter “d”. The external diameter “d” of the thread or the core diameter “k” of the shaft tapers in a middle region of the shaft from a larger dimension “d2” or “k2” respectively towards the proximal end to a smaller dimension “d1” or “k1”, respectively, where “d1” and “k1” do not equal zero. Further, the shaft is provided with a concentrically disposed, radially expandable sleeve, and the sleeve being positioned on the part of the shaft which has the smaller external diameter “d1”. The bone screw may be introduced into a transverse borehole of a medullary pin. The medullary pin is provided with a continuous cannulation, which extends coaxially with the longitudinal axis of the medullary pin and has an external diameter DN and a wall thickness WN.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: April 24, 2012
    Assignee: Synthes USA, LLC
    Inventors: André Schlienger, Peter Senn
  • Patent number: 8147531
    Abstract: A compression pin for urging two bone regions together includes a pin body having a distal end, an opposed proximal end, a first threaded region, and a second threaded region. The first threaded region is positioned near the distal end, and the second threaded region is positioned near the first threaded region. The first threaded region includes a first thread having a FT leading surface that is at a FT leading angle, and the second threaded region includes a second thread having a ST leading surface that is at a ST leading angle that is different than the FT leading angle. During insertion of the compression pin, the first threaded region and the second threaded region cooperate to aggressively compress the bone regions together.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: April 3, 2012
    Assignee: Tornier, Inc.
    Inventors: Ernie Corrao, Rebecca Hawkins Wahl, Alan G. Taylor
  • Patent number: 8118849
    Abstract: A screw assembly (10) for insertion into a bone region (12A) (12B) includes a screw body (14) and a washer (16). The screw body (14) includes a distal end (218), a proximal end (224), and a distal threaded area (220), and a proximal threaded area (226). The distal threaded area (220) is positioned near the distal end (218) and the proximal threaded area (226) is positioned near the proximal end (224). The washer (16) includes a washer threaded area (238) that engages the proximal threaded area (226) to selectively secure the washer (16) to the screw body (14). With this design, the washer (16) can be selectively attached to the screw body (14) and different sized washers (16) can be alternatively and selectively secured to the screw body (14). As a result thereof, the person inserting the screw assembly (10) can pick the washer (16) size best suited to retain the bone region (12A) (12B) in which the screw assembly (10) is being inserted.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: February 21, 2012
    Assignee: Tornier, Inc.
    Inventors: Rebecca Hawkins Wahl, Hanspeter Robert Bayer, Ronald George Litke, Jr., Scott W. Reed, Alan G. Taylor
  • Patent number: 8092505
    Abstract: System, includes devices, methods, and kits, for fixing bone and/or repairing connective tissue associated with bone using a fastener constructed as a bone nail that includes at least one helical ridge having a large pitch. The large pitch permits the nail to be driven into bone by application of axial force to the nail, to secure the nail in the bone. In some embodiments, the bone nail may have a variable pitch that decreases toward the trailing end of the nail.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: January 10, 2012
    Assignee: Acumed LLC
    Inventor: Mark B. Sommers
  • Patent number: 8070786
    Abstract: A method of fusing a joint between two bones, comprising boring a hole through one of the bones across the joint therebetween and into the other bone, placing the leading end of a screw into the hole, where the screw has a threaded region having a pitch that is larger toward a leading end of the screw and smaller toward a trailing end of the screw, and driving the screw into the bone until the threaded region spans the joint.
    Type: Grant
    Filed: January 9, 2006
    Date of Patent: December 6, 2011
    Assignee: Acumed LLC
    Inventors: Randall J. Huebner, Harry C. Smith, Jr.
  • Patent number: 8034076
    Abstract: A surgical fastener apparatus, for securing a surgical mesh material to body tissue including a pair of anchors each having a retaining structure formed on an outer surface thereof; and a suture tether interconnecting the pair of anchors to one another. The pair of anchors have a substantially cylindrical body having a conically tapered distal end and a planar proximal end. The retaining structure includes a series of semi-circular angled projections having a planar proximal surface and a tapered distal end, wherein a center of each of the angled projections is spaced a distance from a longitudinal central axis of the body portion. The surgical fastener is made from a bioabsorbable material which reabsorbs into said body tissue at an appropriate rate, such as for example, polyglycolic acid and polylactic acid.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: October 11, 2011
    Assignee: Tyco Healthcare Group LP
    Inventors: Christopher J. Criscuolo, Russell S. Heinrich, Kourosh Azarbarzin
  • Patent number: 7850717
    Abstract: A bone anchor including a bone engaging element and an implant engaging element. The bone engaging element includes a first portion formed of a first material and a second portion formed of a second material and extending at least partially along a length of the first portion, and with the second portion of the bone engaging element positioned between the first portion and adjacent bone tissue when the bone engaging element is engaged with the bone to provide an interface with the adjacent bone tissue. In one embodiment, the first portion of the bone engaging element exhibits a first level of rigidity and the second portion exhibits a second level of rigidity less than the first level of rigidity. In another embodiment, the bone engaging element includes external threads, with the second portion of the bone engaging element defining at least a portion of the external threads.
    Type: Grant
    Filed: March 1, 2006
    Date of Patent: December 14, 2010
    Assignee: Warsaw Orthopedic, Inc.
    Inventors: Jonathan Dewey, Chris Patterson
  • Patent number: 7578836
    Abstract: A screw, driving device, and method are provided for repairing a tissue injury of a patient, such as a meniscal tear in a knee or osteochondritis dissecans. The screw has a root, a distal section having a narrowing cross section toward the distal end, and a thread along at least a portion of the root between the proximal end and the distal end. Along a leading section extending from the distal end, the helical pitch is substantially constant; along a trailing section between the leading section and the root's proximal end, the helical pitch decreases. The substantially constant pitch along the leading section assists in preventing a stripping of the helical section. At the proximal end is a head having a diameter greater than a major root diameter of the central section. The head is for improving the tissue retention characteristics of the screw.
    Type: Grant
    Filed: January 24, 2006
    Date of Patent: August 25, 2009
    Assignee: Depuy Mitek
    Inventors: Daniel F. Justin, Thomas Wade Fallin, Thomas F. Winters
  • Publication number: 20080249579
    Abstract: A bone screw comprising a threaded shank having a longitudinal axis and including a first helical threading extending along a first length of the threaded shank portion and a second helical threading extending from a location proximately adjacent the first helical threading and along a second length of the threaded shank portion. The first helical threading defines a first volume between adjacent thread turns along the first length, and the second helical threading defines a second volume between adjacent thread turns along the second length, with the first volume being different from the second volume.
    Type: Application
    Filed: April 4, 2007
    Publication date: October 9, 2008
    Inventor: Harold Taylor