Having Intramedullary Patents (Class 623/23.23)
  • Patent number: 10398569
    Abstract: An impactor-extractor for inserting or extracting a stem of a prosthesis into or from a bone can include a body having a first end and a second end. The body can include an impact head located at the first end. A lever can be connected to the body and pivotable about a first pivot point distal to the first end of the body. A base can be located at the second end of the body and can include a first taper connector sized to mate with a second taper connector of the stem. A lock can be located at and pivotable about a second pivot point proximate the second end and can include an extension configured to secure the stem to the first taper connector. Linkages can connect the lever and the lock.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: September 3, 2019
    Assignee: Zimmer, Inc.
    Inventor: Nicolas V. Jaumard
  • Patent number: 10166125
    Abstract: A transdermal intraosseous device includes a transdermal adapter for an external prosthetic device for a bone of a patient and a bone fixator including a distal portion coupled to the transdermal adapter and a proximal portion for anchoring into the bone. The transdermal adapter includes a dome-shaped portion for transcutaneous implantation and an external shaft extending from the dome-shaped portion. A dermal transition structure is configured to include a controlled roughness gradient from the external shaft to the dome-shaped portion and configured for use in infection control at a dermis layer of the patient.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: January 1, 2019
    Assignee: Biomet Manufacturing, LLC
    Inventors: Joshua R. Porter, Troy W. Hershberger
  • Patent number: 9320603
    Abstract: An orthopaedic surgical instrument system includes a first broach including a first end configured to be separately secured to a handle and a tapered body having a plurality of cutting teeth defined therein, and a second broach including a first end configured to be separately secured to the handle in place of the first broach, a first tapered body extending distally from a second end positioned opposite the first end, and a second tapered body extending distally from the first tapered body. The tapered body of the first broach and the first tapered body of the second broach have a first outer geometry and the second tapered body has a second outer geometry different from the first outer geometry.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 26, 2016
    Assignee: DePuy (Ireland)
    Inventors: Jay R. Lieberman, Benjamin J. Sordelet, Richard Spencer Jones, Timothy G. Vendrely, Stephanie M. Wainscott, Rebecca L. Chaney, Joseph G. Wyss, Stephen A. Hazebrouck, Aaron J. Matyas
  • Patent number: 9248021
    Abstract: A removable orthopedic protective sleeve adapted to be applied over the male Morse taper of modular orthopedic implants thereby preventing contamination of the taper contact surface from blood, body fluid or tissue particles responsible for electrochemical corrosion and fretting at the level of Morse taper. Said sleeve having a conical tube shape and a rim at its upper narrow end. A plurality of vertical grooves situated on the outer surface of the protective sleeve will split open as the female Morse taper of the articular ball is slidingly pushed downward and seated over the male taper. The split sleeve is then removed after the male and female tapers are assembled in-situ.
    Type: Grant
    Filed: June 7, 2015
    Date of Patent: February 2, 2016
    Inventor: Zafer Termanini
  • Patent number: 8926708
    Abstract: An implant assembly comprises a stem and an augment. The augment includes a porous outer region which is integrally formed onto a solid inner region. The augment further includes, solid posts integrally formed on the solid inner region and extend through the porous outer region to the outer surface of the augment. The posts are integrally formed with and surrounded by the porous region and are designed to allow assembly of the augment to the stem without damaging the structure of the porous region. A method of attaching the augment is described, wherein a tool is designed to grip to posts of the augment and apply loads through these posts during assembly.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: January 6, 2015
    Assignee: Howmedica Osteonics Corp.
    Inventors: Damon J. Servidio, G. Douglas Letson
  • Patent number: 8926707
    Abstract: A femoral implant (10) comprises a distal end and a proximal end. A stem (12) is provided at the distal end of the implant (10) and comprises a rounded tip (16) for insertion into a femur, in use, and a body (18) of generally tapering form extending in a distal direction from a base to the tip (16). A femoral head (14) is provided at the proximal end of the implant (10) and extends from the base (20) of the stem (12). The body (18) of the stem (12) includes a plurality of discrete steps (22, 24, 26, 28, 30), located between the tip (16) and the base (20), and the steps (22, 24, 26, 28, 30) are concentrated more towards the base (20) of the stem (12) than towards the tip (16).
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: January 6, 2015
    Inventor: Derek James Wallace McMinn
  • Patent number: 8906108
    Abstract: An orthopaedic prosthesis for use in a hip replacement surgery. The orthopaedic prosthesis includes a metallic foam shell and a metallic core. The metallic core includes a neck configured to receive a femoral head component and a stem extending through the metallic foam shell.
    Type: Grant
    Filed: June 18, 2012
    Date of Patent: December 9, 2014
    Assignee: DePuy Synthes Products, LLC
    Inventors: John M. Armacost, Ryan C. Keefer, Jeffrey A. McAnelly
  • Publication number: 20130204387
    Abstract: Disclosed is an orthopedic implant that includes an anchor, a bore, and a compressible and expandable mesh. The anchor is configured to secure the implant at an implantation site and defines a longitudinal axis. The bore is defined by the anchor and extends along the longitudinal axis. The compressible and expandable mesh is aligned along the longitudinal axis and defines a plurality of openings. The mesh is configured to compress along the longitudinal axis and expand from the longitudinal axis to engage surrounding bone or tissue at the implantation site to secure the implant at the implantation site.
    Type: Application
    Filed: February 7, 2013
    Publication date: August 8, 2013
    Applicant: BIOMET MANUFACTURING CORPORATION
    Inventor: BIOMET MANUFACTURING CORPORATION
  • Publication number: 20130173012
    Abstract: A modular prosthetic device for hip joint replacement comprising a stem adapted to be inserted within the femur, a neck element and a spherical head, the stem comprising in an upper region a cavity for accommodating a lower portion of the neck element, which can be coupled in an upper region to a spherical element.
    Type: Application
    Filed: August 1, 2011
    Publication date: July 4, 2013
    Applicants: ADLER ORTHO S.R.L.
    Inventors: Marco Schiraldi, Lodovico Renzi Brivio, Patrizio Cremascol
  • Publication number: 20130060347
    Abstract: A femoral implant (10) comprises a distal end and a proximal end. A stem (12) is provided at the distal end of the implant (10) and comprises a rounded tip (16) for insertion into a femur, in use, and a body (18) of generally tapering form extending in a distal direction from a base to said tip (16). A femoral head (14) is provided at the proximal end of the implant (10) and extends from the base (20) of the stem (12). The body (18) of the stem (12) includes a plurality of discrete steps (22, 24, 26, 28, 30), located between the tip (16) and the base (20), wherein the steps (22, 24, 26, 28, 30) are concentrated more towards the base (20) of the stem (12) than towards the tip (16).
    Type: Application
    Filed: April 19, 2011
    Publication date: March 7, 2013
    Inventor: Derek James Wallace McMinn
  • Patent number: 8323347
    Abstract: A humeral prosthesis includes a stem component and a head component joined by an inclination component. The inclination component is provided with an opening that is designed to accommodate a pair of expandable tabs extending from a side of a plate. The plate is also provided with a taper extending opposite to the pair of expandable tabs. Inclination angle, radial offset, and version are adjustable and are separately and independently set and fixed.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: December 4, 2012
    Assignee: Arthrex, Inc.
    Inventors: Gregory Guederian, Zhixu Guan
  • Publication number: 20120259339
    Abstract: A modular femoral prosthesis for use during performance of a hip revision procedure includes a proximal body component, a distal stem component, and a locking bolt. Surgical instruments and methods for use in implanting such a modular femoral prosthesis are disclosed.
    Type: Application
    Filed: April 5, 2012
    Publication date: October 11, 2012
    Inventors: Megan A. Hood, Vineetha S. Gheevarughese, Jonathan E. Carr
  • Patent number: 7892234
    Abstract: An intramedullary nail having a distal end is introducible into a medullary space. A medullary nail segment which is oriented towards the distal end and has a diameter D, a proximal end, at least two cross holes having a borehole axis and a central line formed by a line connecting centers of gravity of the axially successive transversal surfaces orthogonal with respect to the intramedullary nail, without taking into account the cross holes. The borehole axis of at least one cross-hole is shifted at a gap d1>0 with respect to the central line.
    Type: Grant
    Filed: June 22, 2004
    Date of Patent: February 22, 2011
    Assignee: Synthes USA, LLC
    Inventors: Andre Schlienger, Markus Buettler, Peter Senn
  • Patent number: 7591856
    Abstract: A hip replacement apparatus that normally includes a supporting rod bent into an acute angle at its center with a rounded head on one end. This supporting rod can be received at the pelvis into a pre-assembled housing with a backplate and front plate where the unit can be cemented and/or screwed into the prepared bone at the hip joint. The backplate can have an anchoring protrusion that mates into the trimmed-out bone at the joint. The front plate can have a center hole that receives, and holds the rounded head of the supporting rod from escaping. The head (and hence the supporting rod) freely rotates captively in the housing with the housing firmly attached to the pelvis. The bottom end of the supporting rod can penetrate into the center of the cut-off femur and can be cemented into the bone. The supporting rod can be held to the femur with a bone clamp apparatus including a side plate that can be banded firmly to the femur with one or a more bands.
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: September 22, 2009
    Inventor: Zarija Djurivic
  • Publication number: 20090164026
    Abstract: A femoral stem 2 for artificial hip joint is provided that is capable of tightly fixing a greater trochanter and is suitable for treatment of transcervical fracture where it is necessary to fix the greater trochanter. The femoral stem 2 comprising: a stem member 20 including a distal part 21 of the stem member which is inserted in a medullary cavity of a femur and fixed therein and a proximal part 22 of the stem member which has a neck 26 for fixing an artificial head and is positioned at a proximal end of the distal part, the distal part and the proximal part being integrated or separable; a plate fixing portion 36 which is detachably attached at a top of the proximal part; and a greater trochanter plate 3 for depressing the greater trochanter 71, the greater trochanter being fixed to the plate fixing portion 36 at a certain angle or fixed to the plate fixing portion so as to adjust an angle.
    Type: Application
    Filed: October 26, 2006
    Publication date: June 25, 2009
    Inventors: Hiroshi Mikami, Sumihiko Maeno
  • Publication number: 20080281430
    Abstract: Various embodiments of the invention relate to sleeves (30) having lengths that allow the sleeve to engage a patient's femoral intramedullary canal in a mid to distal region rather than only proximally. In preferred embodiments, the sleeve length is between about 60 millimeters to about 150 millimeters. In certain embodiments, the sleeve is adapted to extend beyond the lesser trochanter, to or near or beyond a patient's isthmus, and provide diaphyseal fixation.
    Type: Application
    Filed: February 22, 2006
    Publication date: November 13, 2008
    Inventors: David C. Kelman, Richard D. Lambert, Alisha Bergin
  • Patent number: 7211113
    Abstract: An endoprosthesis utilizes a biomechanical structure based on the lever model of first degree. Contrary to the widespread practice, the inventive structure has a stem placed inside the femur bone, which is not rigidly attached to this bone. Accordingly, the bone, following its known tendency to slightly pivot away from the medial plane of the body in response to the loads, does not directly contact the stem. The neck portion experiences even greater loads then the stem. The supporting anchor has a region extending laterally from the stem and pressing against a supporting surface of the housing, which also extends laterally from the body of the housing. Since the stem, supporting anchor and neck are typically constitute a one-piece component, the lateral surfaces of the supporting anchor and housing are in continuous frictional contact during displacement of the stem and housing relative to one another.
    Type: Grant
    Filed: May 18, 2004
    Date of Patent: May 1, 2007
    Inventors: Lev Zelener, Konstantin Sherepo, Marina Zelener, Anton Svetlanov
  • Patent number: 7044977
    Abstract: Arthroplasty devices having improved bone in growth to provide a more secure connection within the body. Different embodiments disclosed include devices having threaded intramedullary components, devices configured to receive bone growth promoting substances, devices with resorbable components, and devices configured to reduce shear stress.
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: May 16, 2006
    Inventor: Bret A. Ferree
  • Patent number: 6981991
    Abstract: Arthroplasty devices having improved bone in growth to provide a more secure connection within the body. Different embodiments disclosed include devices having threaded intramedullary components, devices configured to receive bone growth promoting substances, devices with resorbable components, and devices configured to reduce shear stress.
    Type: Grant
    Filed: June 27, 2003
    Date of Patent: January 3, 2006
    Inventor: Bret A. Ferree
  • Publication number: 20040260398
    Abstract: Resorbable devices and systems and methods utilizing the resorbable devices for adjunct stabilization of joint implants in the tubular bones of humans or animals during joint replacement procedures. The resorbable devices are at least partially resorbed by the body over a predetermined period of time, thereby allowing for bone ingrowth into a resulting void.
    Type: Application
    Filed: February 10, 2004
    Publication date: December 23, 2004
    Inventor: David C. Kelman
  • Publication number: 20040199259
    Abstract: A femoral prosthesis including a stem for insertion in a femoral canal and a shoulder and/or neck portion characterized by a proximal sleeve having an outer circumferential wall and comprising two or more proximal sleeve components, each of which provides part of the circumferential outer surface of the sleeve, and means for securing the proximal sleeve components in position at the proximal end of the stem.
    Type: Application
    Filed: March 8, 2004
    Publication date: October 7, 2004
    Applicant: Benoist Girard SAS
    Inventors: Denis Pichon, Christophe Cueille, Nicolas Deloge
  • Patent number: 6755866
    Abstract: A joint prosthesis (10) for cooperation with a long bone (12) and a second bone (26) for use in arthroplasty is provided. A cavity (20) is formed in the long bone (12) and defined by an inner wall (30) of the long bone (12). The prosthesis (10) includes a stem component (32) including a distal portion (34) of the stem component (32) for placement at least partially within the cavity (20) of the long bone (12) and for securing to the long bone (12). The stem component (32) defines a longitudinal axis (36) of the stem component (32). The prosthesis (10) also includes a second component (32) securable to the second bone (26) and for cooperation with the stem component (32). The prosthesis (10) further includes a bearing (40) for placement in the cavity (20) between the stem component (32) and the long bone (12) so that the distal portion of the stem component (32) is spaced from the inner wall (30) of the long bone (12).
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: June 29, 2004
    Assignee: Depuy Products, Inc.
    Inventor: Carleton B. Southworth
  • Publication number: 20040039451
    Abstract: A joint prosthesis (10) for cooperation with a long bone (12) and a second bone (26) for use in arthroplasty is provided. A cavity (20) is formed in the long bone (12) and defined by an inner wall (30) of the long bone (12). The prosthesis (10) includes a stem component (32) including a distal portion (34) of the stem component (32) for placement at least partially within the cavity (20) of the long bone (12) and for securing to the long bone (12). The stem component (32) defines a longitudinal axis (36) of the stem component (32). The prosthesis (10) also includes a second component (32) securable to the second bone (26) and for cooperation with the stem component (32). The prosthesis (10) further includes a bearing (40) for placement in the cavity (20) between the stem component (32) and the long bone (12) so that the distal portion of the stem component (32) is spaced from the inner wall (30) of the long bone (12).
    Type: Application
    Filed: August 20, 2002
    Publication date: February 26, 2004
    Inventor: Carleton B. Southworth
  • Publication number: 20040019386
    Abstract: Arthroplasty devices having improved bone in growth to provide a more secure connection within the body. Different embodiments disclosed include devices having threaded intramedullary components, devices configured to receive bone growth promoting substances, devices with resorbable components, and devices configured to reduce shear stress.
    Type: Application
    Filed: June 27, 2003
    Publication date: January 29, 2004
    Inventor: Bret A. Ferree
  • Publication number: 20040002759
    Abstract: Arthroplasty devices having improved bone in growth to provide a more secure connection within the body. Different embodiments disclosed include devices having threaded intramedullary components, devices configured to receive bone growth promoting substances, devices with resorbable components, and devices configured to reduce shear stress.
    Type: Application
    Filed: June 27, 2003
    Publication date: January 1, 2004
    Inventor: Bret A. Ferree
  • Patent number: 6656226
    Abstract: A plastic jacket for affixing an artificial joint to a bone. The plastic jacket includes a body for contacting with the bone, an opening for receiving the artificial joint, which is formed with a predetermined shape at one end of the body, and an closed wall formed at another end of the body.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: December 2, 2003
    Assignee: Korea Advanced Institute of Science and Technology
    Inventor: Yong-San Yoon
  • Publication number: 20030171816
    Abstract: An intramedullary fixation device for use in securing a trial in the medullary canal of a bone to determine the offset and orientation of a prosthetic implant for replacement of a joint articulating surface of the bone is disclosed. The fixation device comprises a body for receiving a trial and a fixation portion for engaging the trial. A system for use in surgical repair of a joint comprising a selection of prosthetic implants of various sizes, a selection of trials of various sizes corresponding to the sizes of the implants, a selection of fixation devices of various sizes corresponding to the sizes of the trials, a trial fixation device driver for inserting the fixation device and attached trial into the canal of a bone, and a trial device extractor for removing the fixation device from the resected bone is disclosed. Methods of using the fixation device and system of the invention are disclosed.
    Type: Application
    Filed: March 6, 2002
    Publication date: September 11, 2003
    Inventors: Christopher Scifert, Dean Hughes, Scott Elliott
  • Patent number: 6613092
    Abstract: A prosthetic component includes an adaptor having a first end and a second end. The first end includes an elongated male tapered body. The second end includes a flange extending radially outwardly from the male tapered body and having an anti-rotational/anatomically orientation component formed therewith. The second end also includes a female tapered aperture formed therein which has an anti-rotational/anatomical orientation component formed therewith. The flange may include an elongated portion having a porous annular surface thereon.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: September 2, 2003
    Assignee: Centerpulse Orthopedics Inc.
    Inventors: Richard J. Kana, Richard J. Taft
  • Publication number: 20030074080
    Abstract: A prosthesis device for hip surgery replacement has a main body portion which is implanted in the femur of a patient. A series of adapters are provided from which one is selected. Each adapter has a tapered shank which is received a corresponding tapered bore in the main body portion forming a first lock therein. The adapter has tapered teeth which engage corresponding tapered teeth in the bore in the main body portion, forming a second lock. The adapter is indexed with respect to the main body portion. A method of use is disclosed.
    Type: Application
    Filed: October 15, 2002
    Publication date: April 17, 2003
    Inventor: Ian P. Murray
  • Publication number: 20030065397
    Abstract: A prosthetic system that includes a prosthetic implant and a support structure secured to an inner surface of the cavity in the end of the bone is disclosed. The support structure defines a channel that extends through the length of the support structure. The prosthetic implant is received in the channel, and a portion of the prosthetic implant is secured to an inner surface of the channel by an adhesive. The stem of the prosthesis beyond the channel may be cemented or uncemented. The support structure may have an approximately funnel shape. The support structure may be a hollow porous cylindrical sleeve. The support structure may comprise a pair of partially hemispherical components arranged in spaced apart relationship thereby defining a channel between the pair of components. The support structure may comprise a plurality of pedestals secured to the inner surface of the cavity of the bone.
    Type: Application
    Filed: August 22, 2002
    Publication date: April 3, 2003
    Inventors: Arlen D. Hanssen, David G. Lewallen
  • Publication number: 20030050706
    Abstract: The invention relates to a uncemented prosthesis having a tension anchor embodied as a thrust rod that is solely anchored internally in the femural neck by means of a conically axial tension anchor in the dorsolateral corticalis. The femural neck is completely preserved in this prosthesis.
    Type: Application
    Filed: July 30, 2001
    Publication date: March 13, 2003
    Inventors: Klaus Draenert, Norbert Walker
  • Patent number: 6500209
    Abstract: A centralizer for an intramedullary stem of an orthopaedic component that is adapted to be implanted into a medullary canal of a bone includes an annular body having an interior surface and an exterior surface. The centralizer also includes a first exterior fin secured to the exterior surface of the annular body so as to extend outwardly therefrom. The first exterior fin possesses a first length. The centralizer also includes a second exterior fin secured to the exterior surface of the annular body so as to extend outwardly therefrom. The second exterior fin possesses a second length which is greater than the first length. A method of implanting an orthopaedic component into a patient is also disclosed.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: December 31, 2002
    Assignee: DePuy Orthopaedics, Inc.
    Inventor: Eric D. Kolb
  • Patent number: 6464728
    Abstract: A prosthesis for femur replacement surgery has a stem which is received in the femur. The stem has a blind bore formed at an angle in the upper portion. A modular neck assembly is received in the blind bore. The neck assembly is formed at a desired angle with respect to the vertical axis of the stem. The neck assembly is keyed to the bore to obtain a desired degree of anteversion and offset by a desired rotation of the neck assembly within the bore. A unitary sleeve may be inserted in a canal in the femur to receive the stem and provide circumferential movement of the prosthesis within the femur canal. A porous coating is formed on the outer surface of the stem and the sleeve.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: October 15, 2002
    Inventor: Ian P. Murray
  • Publication number: 20020111692
    Abstract: A femoral stem for use with an artificial hip joint assembly having helical cuts formed in the shaft thereof. The helical cuts form a restoring force spring-like shock absorbing geometry which permits the rigid metal material to grossly conform to the elastic modulus of the patient's bone. This femoral stem reduces the shock loading and attending pain associated with activities, such as standing, walking, and descending stairs, which often plague hip replacement patients.
    Type: Application
    Filed: February 15, 2001
    Publication date: August 15, 2002
    Inventors: James D. Ralph, Stephen Tatar
  • Publication number: 20020045949
    Abstract: A prosthesis provided with a stem at least part of which is enclosed in a mantle and which is for insertion in a bone cavity and attachment thereto by cement, said mantle having a wall thickness which is increased towards its proximal end to provide an outwardly projecting proximal balcony and which is dimensioned and adapted to locate the stem in a predetermined position within the cross-sectional area of the bone cavity at or towards the proximal end thereof.
    Type: Application
    Filed: September 12, 2001
    Publication date: April 18, 2002
    Inventors: Robin Sydney Mackwood Ling, Graham Allan Gie, Andrew John Timperley, John Andrew Storer
  • Publication number: 20020040244
    Abstract: A prosthetic femoral stem component comprising a body element, a neck element and a stem element, with the body element, neck element and stem element being secured to one another with a modular connection, wherein the modular connection comprises a taper junction and an engaged-fit junction.
    Type: Application
    Filed: July 20, 2001
    Publication date: April 4, 2002
    Inventors: Alfred S. Despres, Daniel E.E. Hayes
  • Publication number: 20010018616
    Abstract: A device is provided for anchoring an endoprosthesis in a bone, for example a thigh portion of a hip joint endoprosthesis in a femur. The device is configured in the form of a quiver-like receptacle which can be implanted in the bone for receiving a shaft of the endoprosthesis. The receptacle comprises an inner wall enclosing the shaft and an outer wall disposed at a distance therefrom. A space between the inner wall and the outer wall is filled with a medium, in which an externally applied pressure is uniformly distributed substantially to all sides for damping impacts exerted on the endoprosthesis.
    Type: Application
    Filed: December 28, 2000
    Publication date: August 30, 2001
    Inventor: Jan M. Schwab
  • Publication number: 20010016780
    Abstract: The present invention is intended to provide a metal jacket for a cementless artificial joint stem, wherein shear force detrimental to the service life of an artificial joint can be markedly reduced and stress shielding phenomena can also be markedly relieved, due to the construction of the metal jacket which can be fixed to the bone and can enclose the surface of the stem so as to allow for the stem of artificial joint to slide vertically relative to the bone, and wherein osteolysis of a bone due to the infiltration of wear particles can be minimized by curbing the gap formation between the bone and the stem.
    Type: Application
    Filed: February 7, 2001
    Publication date: August 23, 2001
    Inventor: Yoon Yong San
  • Publication number: 20010014829
    Abstract: The present invention is intended to provide a plastic jacket for a cementless artificial joint stem, wherein shear force detrimental to the service life of an artificial joint can be markedly reduced and stress shielding phenomena can also be markedly relieved, due to the construction of the plastic jacket which can be fixed to the bone canal and can enclose the surface of the stem so as to allow for the stem of artificial joint to slide vertically relative to the bone, and wherein osteolysis of a bone due to the infiltration of wear particles can be minimized by curbing the gap formation between the bone and the stem.
    Type: Application
    Filed: February 9, 2001
    Publication date: August 16, 2001
    Inventor: Yong-San Yoon
  • Publication number: 20010014828
    Abstract: The present invention relates to a cement jacket for a cemented artificial joint stem, wherein shear force detrimental to the service life of an artificial joint can be markedly reduced while the compressive force beneficial for the strengthening of the bone is significantly increased and stress shielding phenomena which makes the bone resorbed can also be markedly relieved, due to the construction of the cement jacket which can be fixed within the bone canal and can enclose the surface of the stem so as to allow for the artificial joint stem to slide vertically relative to the bone, and wherein the osteolysis of a femur due to the infiltration of wear particle can be minimized by curbing the gap formation between the femur and the stem.
    Type: Application
    Filed: February 8, 2001
    Publication date: August 16, 2001
    Inventor: Yong-San Yoon
  • Patent number: 6264699
    Abstract: An orthopaedic prosthesis system for replacement of an articulating portion of a long bone includes a sleeve, a stem, and a neck. The sleeve has an outer bone engagement surface and includes opposed proximal and distal female taper regions. The stem has a distal end for fixation within a long bone and a proximal end including a male taper region engaged with the distal female taper of the sleeve. The neck has a taper post that engages the proximal taper of the sleeve. Both the neck and the sleeve may define axial bores, the axial bore in the sleeve communicating with and being generally coaxial with the two opposed female tapers, and the neck axial bore extending through the taper post. A connecting element can engage the stem, pass through the axial bore in the sleeve, extend into the axial bore in the neck taper post, and engage the neck.
    Type: Grant
    Filed: November 23, 1998
    Date of Patent: July 24, 2001
    Assignee: Depuy Orthopaedics, Inc.
    Inventors: Douglas G. Noiles, Alfred F. DeCarlo, Jr.