Surgical tools which are used to separate from one another a femoral cup and an acetabular ball in an implanted hip replacement prosthesis. At its distal end, elements of the surgical tool engage the femoral cup and the acetabular cup. When proximal handles of the tool are squeezed toward one another, the engagement elements move away from one another. Thus, a surgeon is able to separate the femoral cup and the acetabular ball from one another without pulling the acetabular cup away from the acetabulum or the femoral cup and/or femoral implant away from the femur, thereby accomplishing the separation without disrupting any bone ingrowth.
A surgical tool for extracting an acetabular ball from an acetabular cup in an implanted hip prosthesis wherein the from acetabular ball is affixed by means of a Morse taper to a stem extending from bottom of the concave portion of the acetabular cup. The surgical tool enables a surgeon to remove the ball without pulling on the acetabular cup and without disrupting any bone ingrowth because the tool maintains pressure on the cup while exerting an opposing pressure pulling on the ball.
Surgical trays and tools for use in hip revision surgery wherein the implanted prosthesis is a reverse prosthesis comprising an acetabular ball and a femoral cup. A set of trays is provided having tools for i) separating a femoral cup from an acetabular ball, ii) separating a femoral cup from a femoral implant and iii) separating an acetabular ball from an acetabular cup. A tool for removing an acetabular cup from an acetabulum is also described. A surgical method is also provided wherein the acetabular ball and femoral cup are separated first followed by, in any order, separating the femoral cup from the femoral implant and separating the acetabular ball from the acetabular cup.
A61B 50/30 - Récipients spécialement adaptés à l'emballage, la protection, la distribution, la collecte ou l'élimination des appareils ou des instruments chirurgicaux ou de diagnostic
4.
Surgical trays, instruments and methods for implanting a hip replacement prosthesis
Surgical trays, tools and methods for use in hip replacement surgery wherein the hip replacement prosthesis is a reverse hip prosthesis. The trial components, specialized tools and methods of the invention enable a surgeon to identify the optimum components of the reverse hip prosthesis for implantation in a patient based on the sizes and angles best adapted to the patent's anatomy.
A61B 17/00 - Instruments, dispositifs ou procédés chirurgicaux, p.ex. tourniquets
A61B 17/16 - Ostéoclastes; Forets ou ciseaux pour os; Trépans
A61B 17/17 - Dispositifs de guidage pour les forets
A61B 50/20 - Récipients, étuis, mobilier ou supports spécialement adaptés aux appareils ou aux instruments chirurgicaux ou de diagnostic, p.ex. étuis stériles Équipements de support spécialement adaptés aux appareils ou aux instruments chirurgicaux ou de diagnostic
A61B 50/30 - Récipients spécialement adaptés à l'emballage, la protection, la distribution, la collecte ou l'élimination des appareils ou des instruments chirurgicaux ou de diagnostic
A61F 2/00 - Filtres implantables dans les vaisseaux sanguins; Prothèses, c.-à-d. éléments de substitution ou de remplacement pour des parties du corps; Appareils pour les assujettir au corps; Dispositifs maintenant le passage ou évitant l'affaissement de structures corporelles tubulaires, p.ex. stents
A surgical tool for extracting an acetabular ball from an acetabular cup in an implanted hip prosthesis wherein the acetabular ball is affixed by means of a Morse taper to a stem extending from bottom of the concave portion of the acetabular cup. The surgical tool enables a surgeon to remove the ball without pulling on the acetabular cup and without disrupting any bone ingrowth because the tool maintains pressure on the cup while exerting an opposing pressure pulling on the ball.
Surgical tools which are used to separate from one another a femoral cup and an acetabular ball in an implanted hip replacement prosthesis. At its distal end, elements of the surgical tool engage the femoral cup and the acetabular cup. When proximal handles of the tool are squeezed toward one another, the engagement elements move away from one another. Thus, a surgeon is able to separate the femoral cup and the acetabular ball from one another without pulling the acetabular cup away from the acetabulum or the femoral cup and/or femoral implant away from the femur, thereby accomplishing the separation without disrupting any bone ingrowth.
New surgical instruments and methods used to implant elements of a reverse hip prosthesis in a patient are described. The instruments are impactors which are struck with a hammer at their proximal ends after the instrument has been used to position the implant element in the patient. An acetabular cup impactor has inclination and anteversion rods which are used to position the acetabular cup optimally in the acetabulum. An acetabular ball impactor affixes the acetabular ball in the acetabular cup by means of a Morse taper. And a femoral cup impactor affixes the femoral cup in the femoral stem by means of a Morse taper.
New surgical instruments and methods used to implant elements of a reverse hip prosthesis in a patient are described. The instruments are impactors which are struck with a hammer at their proximal ends after the instrument has been used to position the implant element in the patient. An acetabular cup impactor has inclination and anteversion rods which are used to position the acetabular cup optimally in the acetabulum. An acetabular ball impactor affixes the acetabular ball in the acetabular cup by means of a Morse taper. And a femoral cup impactor affixes the femoral cup in the femoral stem by means of a Morse taper.
Disclosed is a reconfigurable hip joint prosthesis and elements therefor which is adapted to be surgically implantable in a human body, a part (10) in the upper femur, another part (70) in the pelvis. The implantable prosthesis may be configured in a reversible manner, and provide alternative configurations as may be desired or necessary. The present invention also includes a method of implanting into a human body a prosthesis as described herein, and subsequently reconfiguring the prosthesis as may be desired or necessary. A still further aspect of the invention is a kit of component parts used in providing a configured implantable prosthesis.
Disclosed is a reconfigurable hip joint prosthesis and elements therefor which is adapted to be surgically implantable in a human body, a part (10) in the upper femur, another part (70) in the pelvis. The implantable prosthesis may be configured in a reversible manner, and provide alternative configurations as may be desired or necessary. The present invention also includes a method of implanting into a human body a prosthesis as described herein, and subsequently reconfiguring the prosthesis as may be desired or necessary. A still further aspect of the invention is a kit of component parts used in providing a configured implantable prosthesis.
Disclosed is a reconfigurable hip joint prosthesis and elements therefor which is adapted to be surgically implantable in a human body, a part in the upper femur, another part in the pelvis. The implantable prosthesis may be configured in a reversible manner, and provide alternative configurations as may be desired or necessary. The present invention also includes a method of implanting into a human body a prosthesis as described herein, and subsequently reconfiguring the prosthesis as may be desired or necessary. A still further aspect of the invention is a kit of component parts used in providing a configured implantable prosthesis.
When an acetabular cup used in hip replacement surgery is to be affixed to the acetabulum using screws, the drill guide instruments of the invention are used to position a drill bit so that the screw holes drilled in the acetabulum are properly placed for optimum implantation of the acetabular cup. The drill guide is locked into the acetabular cup by spring loaded pins which position the guide over holes in the cup which accommodate the screws. The guide is used to position the drill bits and allow drilling. After drilling the guide is removed.
Surgical trays, tools and methods for use in hip replacement surgery wherein the hip replacement prosthesis is a reverse hip prosthesis. The trial components, specialized tools and methods of the invention enable a surgeon to identify the optimum components of the reverse hip prosthesis for implantation in a patient based on the sizes and angles best adapted to the patent's anatomy.
A61F 2/00 - Filtres implantables dans les vaisseaux sanguins; Prothèses, c.-à-d. éléments de substitution ou de remplacement pour des parties du corps; Appareils pour les assujettir au corps; Dispositifs maintenant le passage ou évitant l'affaissement de structures corporelles tubulaires, p.ex. stents
A surgical tool and method used to extract an acetabular cup from an acetabulum with minimal or no bone damage even if there has been significant bone ingrowth prior to the extraction process. The tool is designed for use with a reverse hip prosthesis wherein the acetabular cup comprises a stem extending from its concave surface and an acetabular ball is affixed to the stem. The tool is rotated on the ball and a blade is thereby caused to rotate adjacent or in close proximity to a convex surface of the cup in a position between the acetabular bone and the cup, thereby separating the cup from the bone.
New surgical instruments and methods used to implant elements of a reverse hip prosthesis in a patient are described. The instruments are impactors which are struck with a hammer at their proximal ends after the instrument has been used to position the implant element in the patient. An acetabular cup impactor has inclination and anteversion rods which are used to position the acetabular cup optimally in the acetabulum. An acetabular ball impactor affixes the acetabular ball in the acetabular cup by means of a Morse taper. And a femoral cup impactor affixes the femoral cup in the femoral stem by means of a Morse taper.
A surgical tool and method for separating a femoral cup or a femoral ball from an implanted femoral implant without disturbing the femoral implant. The tool is comprised of upper and lower lever arms which turn on an adjustable fulcrum. The upper lever arm has a distal end adapted to engage a femoral cup or a femoral ball and the distal end of the lower lever arm engages the implant. Proximal ends of the lever arms engage a drive assembly which is used to cause the distal ends to move away from one another thereby separating the femoral cup or ball from the femoral implant.
A surgical tool and method for separating a femoral cup or a femoral ball from an implanted femoral implant without disturbing the femoral implant. The tool is comprised of upper and lower lever arms which turn on an adjustable fulcrum. The upper lever arm has a distal end adapted to engage a femoral cup or a femoral ball and the distal end of the lower lever arm engages the implant. Proximal ends of the lever arms engage a drive assembly which is used to cause the distal ends to move away from one another thereby separating the femoral cup or ball from the femoral implant.
Surgical trays and tools for use in hip revision surgery wherein the implanted prosthesis is a reverse prosthesis comprising an acetabular ball and a femoral cup. A set of trays is provided having tools for i) separating a femoral cup from an acetabular ball, ii) separating a femoral cup from a femoral implant and iii) separating an acetabular ball from an acetabular cup. A tool for removing an acetabular cup from an acetabulum is also described. A surgical method is also provided wherein the acetabular ball and femoral cup are separated first followed by, in any order, separating the femoral cup from the femoral implant and separating the acetabular ball from the acetabular cup.
Surgical trays, tools and methods for use in hip replacement surgery wherein the hip replacement prosthesis is a reverse hip prosthesis. The trial components, specialized tools and methods of the invention enable a surgeon to identify the optimum components of the reverse hip prosthesis for implantation in a patient based on the sizes and angles best adapted to the patent's anatomy.
Surgical trays and tools for use in hip revision surgery wherein the implanted prosthesis is a reverse prosthesis comprising an acetabular ball and a femoral cup. A set of trays is provided having tools for i) separating a femoral cup from an acetabular ball, ii) separating a femoral cup from a femoral implant and iii) separating an acetabular ball from an acetabular cup. A tool for removing an acetabular cup from an acetabulum is also described. A surgical method is also provided wherein the acetabular ball and femoral cup are separated first followed by, in any order, separating the femoral cup from the femoral implant and separating the acetabular ball from the acetabular cup.
Surgical trays, tools and methods for use in hip replacement surgery wherein the hip replacement prosthesis is a reverse hip prosthesis. The trial components, specialized tools and methods of the invention enable a surgeon to identify the optimum components of the reverse hip prosthesis for implantation in a patient based on the sizes and angles best adapted to the patent's anatomy.
Disclosed are methods of using a new instrument for attaching an acetabular ball into an acetabular cup part of a reverse-hip prosthesis. The instrument includes one end which removably retains the acetabular ball, which is used to mount onto a stem of the acetabular cup part, and another end which may be impacted during mounting of the acetabular ball onto the stem to secure it thereto.
When an acetabular cup used in hip replacement surgery is to be affixed to the acetabulum using screws, the drill guide instruments of the invention are used to position a drill bit so that the screw holes drilled in the acetabulum are properly placed for optimum implantation of the acetabular cup. The drill guide is locked into the acetabular cup by spring loaded pins which position the guide over holes in the cup which accommodate the screws. The guide is used to position the drill bits and allow drilling. After drilling the guide is removed.
Surgical tools which are used to separate from one another a femoral cup and an acetabular ball in an implanted hip replacement prosthesis. At its distal end, elements of the surgical tool engage the femoral cup and the acetabular cup. When proximal handles of the tool are squeezed toward one another, the engagement elements move away from one another. Thus, a surgeon is able to separate the femoral cup and the acetabular ball from one another without pulling the acetabular cup away from the acetabulum or the femoral cup and/or femoral implant away from the femur, thereby accomplishing the separation without disrupting any bone ingrowth.
Surgical tools which are used to separate from one another a femoral cup and an acetabular ball in an implanted hip replacement prosthesis. At its distal end, elements of the surgical tool engage the femoral cup and the acetabular cup. When proximal handles of the tool are squeezed toward one another, the engagement elements move away from one another. Thus, a surgeon is able to separate the femoral cup and the acetabular ball from one another without pulling the acetabular cup away from the acetabulum or the femoral cup and/or femoral implant away from the femur, thereby accomplishing the separation without disrupting any bone ingrowth.
A61B 17/00 - Instruments, dispositifs ou procédés chirurgicaux, p.ex. tourniquets
A61B 17/16 - Ostéoclastes; Forets ou ciseaux pour os; Trépans
A61B 17/56 - Instruments ou procédés chirurgicaux pour le traitement des os ou des articulations; Dispositifs spécialement adaptés à cet effet
A61B 17/58 - Instruments ou procédés chirurgicaux pour le traitement des os ou des articulations; Dispositifs spécialement adaptés à cet effet pour ostéosynthèse, p.ex. plaques, vis ou analogues
A61F 2/00 - Filtres implantables dans les vaisseaux sanguins; Prothèses, c.-à-d. éléments de substitution ou de remplacement pour des parties du corps; Appareils pour les assujettir au corps; Dispositifs maintenant le passage ou évitant l'affaissement de structures corporelles tubulaires, p.ex. stents
When an acetabular cup used in hip replacement surgery is to be affixed to the acetabulum using screws, the drill guide instruments of the invention are used to position a drill bit so that the screw holes drilled in the acetabulum are properly placed for optimum implantation of the acetabular cup. The drill guide is locked into the acetabular cup by spring loaded pins which position the guide over holes in the cup which accommodate the screws. The guide is used to position the drill bits and allow drilling. After drilling the guide is removed.
New surgical instruments and methods used to implant elements of a reverse hip prosthesis in a patient are described. The instruments are impactors which are struck with a hammer at their proximal ends after the instrument has been used to position the implant element in the patient. An acetabular cup impactor has inclination and anteversion rods which are used to position the acetabular cup optimally in the acetabulum. An acetabular ball impactor affixes the acetabular ball in the acetabular cup by means of a Morse taper. And a femoral cup impactor affixes the femoral cup in the femoral stem by means of a Morse taper.
A surgical tool and method used to extract an acetabular cup from an acetabulum with minimal or no bone damage even if there has been significant bone ingrowth prior to the extraction process. The tool is designed for use with a reverse hip prosthesis wherein the acetabular cup comprises a stem extending from its concave surface and an acetabular ball is affixed to the stem. The tool is rotated on the ball and a blade is thereby caused to rotate adjacent or in close proximity to a convex surface of the cup in a position between the acetabular bone and the cup, thereby separating the cup from the bone.
A61B 17/58 - Instruments ou procédés chirurgicaux pour le traitement des os ou des articulations; Dispositifs spécialement adaptés à cet effet pour ostéosynthèse, p.ex. plaques, vis ou analogues
A61B 17/60 - Instruments ou procédés chirurgicaux pour le traitement des os ou des articulations; Dispositifs spécialement adaptés à cet effet pour ostéosynthèse, p.ex. plaques, vis ou analogues pour l'ostéosynthèse externe, p.ex. appareils étireurs ou constricteurs
A61F 2/00 - Filtres implantables dans les vaisseaux sanguins; Prothèses, c.-à-d. éléments de substitution ou de remplacement pour des parties du corps; Appareils pour les assujettir au corps; Dispositifs maintenant le passage ou évitant l'affaissement de structures corporelles tubulaires, p.ex. stents
29.
TOOL AND METHOD FOR REMOVING AN ACETABULAR BALL FROM AN ACETABULAR CUP IN A HIP REPLACEMENT PROSTHESIS
A surgical tool for extracting an acetabular ball from an acetabular cup in an implanted hip prosthesis wherein the acetabular ball is affixed by means of a Morse taper to a stem extending from bottom of the concave portion of the acetabular cup. The surgical tool enables a surgeon to remove the ball without pulling on the acetabular cup and without disrupting any bone ingrowth because the tool maintains pressure on the cup while exerting an opposing pressure pulling on the ball.
New surgical instruments and methods used to implant elements of a reverse hip prosthesis in a patient are described. The instruments are impactors which are struck with a hammer at their proximal ends after the instrument has been used to position the implant element in the patient. An acetabular cup impactor has inclination and anteversion rods which are used to position the acetabular cup optimally in the acetabulum. An acetabular ball impactor affixes the acetabular ball in the acetabular cup by means of a Morse taper. And a femoral cup impactor affixes the femoral cup in the femoral stem by means of a Morse taper.
A surgical tool and method used to extract an acetabular cup from an acetabulum with minimal or no bone damage even if there has been significant bone ingrowth prior to the extraction process. The tool is designed for use with a reverse hip prosthesis wherein the acetabular cup comprises a stem extending from its concave surface and an acetabular ball is affixed to the stem. The tool is rotated on the ball and a blade is thereby caused to rotate adjacent or in close proximity to a convex surface of the cup in a position between the acetabular bone and the cup, thereby separating the cup from the bone.
A61B 17/58 - Instruments ou procédés chirurgicaux pour le traitement des os ou des articulations; Dispositifs spécialement adaptés à cet effet pour ostéosynthèse, p.ex. plaques, vis ou analogues
A61B 17/60 - Instruments ou procédés chirurgicaux pour le traitement des os ou des articulations; Dispositifs spécialement adaptés à cet effet pour ostéosynthèse, p.ex. plaques, vis ou analogues pour l'ostéosynthèse externe, p.ex. appareils étireurs ou constricteurs
A61F 2/00 - Filtres implantables dans les vaisseaux sanguins; Prothèses, c.-à-d. éléments de substitution ou de remplacement pour des parties du corps; Appareils pour les assujettir au corps; Dispositifs maintenant le passage ou évitant l'affaissement de structures corporelles tubulaires, p.ex. stents
Disclosed is a femoral cup impactor assembly which is used in joining a femoral cup part of a reverse hip prosthesis to a femoral implant. Also disclosed is a kit comprising parts of the femoral cup impactor assembly.
A surgical tool for extracting an acetabular ball from an acetabular cup in an implanted hip prosthesis wherein the acetabular ball is affixed by means of a Morse taper to a stem extending from bottom of the concave portion of the acetabular cup. The surgical tool enables a surgeon to remove the ball without pulling on the acetabular cup and without disrupting any bone ingrowth because the tool maintains pressure on the cup while exerting an opposing pressure pulling on the ball.
A61B 17/00 - Instruments, dispositifs ou procédés chirurgicaux, p.ex. tourniquets
A61B 17/16 - Ostéoclastes; Forets ou ciseaux pour os; Trépans
A61B 17/88 - Moyens ou procédés pour implanter ou pour extraire des dispositifs de fixation interne
A61F 2/00 - Filtres implantables dans les vaisseaux sanguins; Prothèses, c.-à-d. éléments de substitution ou de remplacement pour des parties du corps; Appareils pour les assujettir au corps; Dispositifs maintenant le passage ou évitant l'affaissement de structures corporelles tubulaires, p.ex. stents
A surgical instrument for separating a femoral cup or a femoral ball from a femoral implant wherein the cup or ball is affixed to the implant by means of a Morse taper. A tapered wedge in the form of a two pronged fork is provided at the distal end of the instrument for placement between the cup or ball and the femoral implant. Then the proximal end of the instrument is struck with a hammer to separate the cup or ball from the femoral implant. The surgical instrument of the invention enables a surgeon to remove the cup or ball without pulling on the femoral implant and, thereby, without disrupting any bone ingrowth in the implanted femoral implant.
An orthopedic instrument for installing a new reverse hip prosthesis, particularly the acetabular cup thereof, wherein the cup can be affixed to the pelvis with or without screws. The acetabular cup is releasably attached to the instrument and the instrument is used to position the cup in the pelvis. Optional screw guides are provided in the instrument in case the surgeon wishes to use screws to affix the cup to the pelvis.
Interlocking acetabular fixation screws having a threaded shaft for threading into cancellous bone and a tapered threaded head for threading into tapered threaded screw holes in a reverse hip acetabular cup. The reverse hip acetabular cup has a central stem and the threaded screw holes are drilled at an angle that allows drilling of the bone of the acetabular cavity, placement of the screws and tightening of the screws without touching the central stem and without interference from the central stem.
An interlocking reverse shoulder prosthesis including a glenoid cup being implanted in the glenoid fossa having a glenoid ball, firmly attached to the central portion of the cup via Morse taper. The humeral component having a hemispherical cup attached to the neck of the implant via Morse taper in a modular fashion thereby allowing use of several neck lengths. After implantation of the glenoid cup, glenoid hall and the humeral cup, the members are assembled together for relative movement. The glenoid cup is secured by several screws or resorbable fixation studs. During range of motion, the edge of the humeral cup becomes inserted into a gap located between the glenoid cup and the glenoid ball and becomes restrained thus reducing the likelihood of dislocation during extreme range of motion.
A reverse hip prosthesis comprising an acetabular cup for implanting in an acetabular socket. The acetabular cup is secured to the acetabular socket. The acetabular cup has a stem extending from the center of a concave portion thereof and an acetabular ball is attached to the stem. A femoral implant has a femoral cup attached to the proximal end thereof. The femoral cup has a stem which can be made with several stem lengths in order to accommodate the various sizing requirements of patients. After implantation of the acetabular cup and ball and the femoral cup, the members are assembled together so that the femoral cup can articulate on the acetabular ball. The prosthesis of the invention has a wide range of motion and substantially improved tribology.
The lined femoral cup of the invention is used in a new reverse hip prosthesis wherein the cup is affixed to the femur and the ball is affixed to the acetabulum. This permits installation of the liner in the factory instead of the operating room. Prior art hip prostheses require installation of the liner in the operating room because the cup must be affixed to the acetabulum, usually by screws, before the liner can be installed. Thus, in a preferred embodiment of the invention the liner is installed under high pressure in the factory. In a second embodiment, a threaded cap is used which permits replacement of the liner without removing the cup from the patient.
Interlocking acetabular fixation screws having a threaded shaft for threading into cancellous bone and a tapered threaded head for threading into tapered threaded screw holes in a reverse hip acetabular cup. The reverse hip acetabular cup has a central stem and the threaded screw holes are drilled at an angle that allows drilling of the bone of the acetabular cavity, placement of the screws and tightening of the screws without touching the central stem and without interference from the central stem.
Interlocking acetabular fixation screws having a threaded shaft for threading into cancellous bone and a tapered threaded head for threading into tapered threaded screw holes in a reverse hip acetabular cup. The reverse hip acetabular cup has a central stem and the threaded screw holes are drilled at an angle that allows drilling of the bone of the acetabular cavity, placement of the screws and tightening of the screws without touching the central stem and without interference from the central stem.
An orthopedic instrument for installing a new reverse hip prosthesis, particularly the acetabular cup thereof, wherein the cup can be affixed to the pelvis with or without screws. The acetabular cup is releasably attached to the instrument and the instrument is used to position the cup in the pelvis. Optional screw guides are provided in the instrument in case the surgeon wishes to use screws to affix the cup to the pelvis.
An orthopedic instrument for installing a new reverse hip prosthesis, particularly the acetabular cup thereof, wherein the cup can be affixed to the pelvis with or without screws. The acetabular cup is releasably attached to the instrument and the instrument is used to position the cup in the pelvis. Optional screw guides are provided in the instrument in case the surgeon wishes to use screws to affix the cup to the pelvis.
A61B 17/17 - Dispositifs de guidage pour les forets
A61F 2/00 - Filtres implantables dans les vaisseaux sanguins; Prothèses, c.-à-d. éléments de substitution ou de remplacement pour des parties du corps; Appareils pour les assujettir au corps; Dispositifs maintenant le passage ou évitant l'affaissement de structures corporelles tubulaires, p.ex. stents
A reverse hip prosthesis comprising an acetabular cup for implanting in an acetabular socket. The acetabular cup is secured to the acetabular socket of the pelvis using fasteners. The acetabular cup has a stem extending from the center of a concave portion thereof and an acetabular ball is attached to the stem, preferably by means of a Morse taper. A femoral implant is provided with a femoral cup attached to the proximal end thereof. The femoral cup has a stem which can be constructed in a modular fashion with several stem lengths in order to accommodate the various sizing requirements of different patients. After implantation of the acetabular cup and ball and the femoral cup, the members are assembled together so that the femoral cup can articulate on the acetabular ball. The prosthesis of the invention has a wide range of motion and substantially improved tribology. As the femoral cup is articulated, the edge of the femoral cup moves into a space located between the acetabular cup and the acetabular ball and thereby becomes restrained, thus reducing the likelihood of dislocation during extreme ranges of motion.
A reverse hip prosthesis comprising an acetabular cup for implanting in an acetabular socket. The acetabular cup is secured to the acetabular socket of the pelvis using fasteners. The acetabular cup has a stem extending from the center of a concave portion thereof and an acetabular ball is attached to the stem, preferably by means of a Morse taper. A femoral implant is provided with a femoral cup attached to the proximal end thereof. The femoral cup has a stem which can be constructed in a modular fashion with several stem lengths in order to accommodate the various sizing requirements of different patients. After implantation of the acetabular cup and ball and the femoral cup, the members are assembled together so that the femoral cup can articulate on the acetabular ball. The prosthesis of the invention has a wide range of motion and substantially improved tribology. As the femoral cup is articulated, the edge of the femoral cup moves into a space located between the acetabular cup and the acetabular ball and thereby becomes restrained, thus reducing the likelihood of dislocation during extreme ranges of motion.
A reverse hip prosthesis comprising an acetabular cup for implanting in an acetabular socket. The acetabular cup is secured to the acetabular socket of the pelvis using fasteners. The acetabular cup has a stem extending from the center of a concave portion thereof and an acetabular ball is attached to the stem, preferably by means of a Morse taper. A femoral implant is provided with a femoral cup attached to the proximal end thereof. The femoral cup has a stem which can be constructed in a modular fashion with several stem lengths in order to accommodate the various sizing requirements of different patients. After implantation of the acetabular cup and ball and the femoral cup, the members are assembled together so that the femoral cup can articulate on the acetabular ball. The prosthesis of the invention has a wide range of motion and substantially improved tribology. As the femoral cup is articulated, the edge of the femoral cup moves into a space located between the acetabular cup and the acetabular ball and thereby becomes restrained, thus reducing the likelihood of dislocation during extreme ranges of motion.
An interlocking reversed hip prosthesis including an acetabular cup being implanted in the acetabular cavity having an acetabular articular ball, firmly attached to the central portion of the cup via Morse taper. The femoral component having a hemispherical cup attached to the neck of the implant via Morse taper in a modular fashion thereby allowing use of several length necks. After implantation of the acetabular cup and the femoral cup, the two members are assembled together for relative movement. The acetabular cup secured by several screws or resorbable fixation studs. During range of motion, the edge of the femoral cup becomes inserted into space located between the acetabular cup and the acetabular ball and becomes restrained thus reducing the likelihood of dislocation during extreme range of motion.
brevets
