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US3806960A - Acetabulum implant - Google Patents

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Publication number
US3806960A
US3806960A US32867273A US3806960A US 3806960 A US3806960 A US 3806960A US 32867273 A US32867273 A US 32867273A US 3806960 A US3806960 A US 3806960A
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Prior art keywords
acetabulum
layer
body
anchorage
resilient
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Expired - Lifetime
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B Weber
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Sulzer AG
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Sulzer AG
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/30767Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth
    • A61F2/30771Special external and/or bone-contacting surfaces, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes, grooves
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30563Special structural features of bone or joint prostheses not otherwise provided for having elastic means or damping means, different from springs, e.g. including an elastomeric core or shock absorbers
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2002/3241Joints for the hip having a ring, e.g. for locking the femoral head into the acetabular cup
    • A61F2002/3266Wire ring
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/32Joints for the hip
    • A61F2/34Acetabular cups
    • A61F2002/3412Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
    • A61F2002/3417Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface the outer shell having protrusions on meridian lines, e.g. equidistant fins or wings around the equatorial zone
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/46Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
    • A61F2002/4631Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor the prosthesis being specially adapted for being cemented

Abstract

The acetabulum is formed of a rigid cup shaped body which has a layer of highly resilient material, such as silicone rubber, secured on the outside. The resilient layer is bonded via a suitable cement to the pelvis and acts to insure against loosening of the rigid body from the pelvis under vibrations while also acting as a cushion.

Description

United States Patent [19] Weber ACETABULUM IMPLANT [75] Inventor: Bernhard Georg Weber, St. Gallen,

Switzerland [73] Assignee: Sulzer Brothers Ltd., Winterthur,

Switzerland [22] Filed: Feb. 1, 1973 211 App]. No.: 328,672

[52] US. Cl. 3/1, 128/92 C [51] Int. Cl. A61f 1/24 [58] Field of Search..... 3/1; 128/92 C, 92 CA, 92 R [56] References Cited UNITED STATES PATENTS 2,668,531 2/1954 Haboush 128/92 CA 3,064,645 1 1/1962 Ficat et a1. 128/92 CA 3,685,058 8/1972 Tronzo 3/1 Apr. 30, 1974 FOREIGN PATENTS OR APPLICATIONS 1,122,634 5/1956 France 128/92 C Primary ExaminerRichard A. Gaudet Assistant Examiner-Ronald L. Frinks Attorney, Agent, or FirmKenyon & Kenyon Reilly Carr & Chapin 1 1 ABSTRACT The acetabulum is formed of a rigid cup shaped body which has a layer of highly resilient material, such as silicone rubber, secured on the outside. The resilient layer is bonded via a suitable cement to the pelvis and acts to insure against loosening of the rigid body from the pelvis under vibrations while also acting as a cushion.

7 Claims, 5 Drawing Figures ACETABULUM IMPLANT This invention relates to an acetabulum and more particularly to an implant for placement in the pelvis to function as the normal acetabulum.

I-leretofore, it'has been known to fabricate artificial acetabula or sockets for use as components of a prosthetic hip joint. Generally, the acetebulum which has been used has been secured in a pelvis by means of a conventional bone cement. However, in the course of time, it has been found that the acetabulum has worked loose. It is supposed that the main reason for this is microvibrations which, when the joint experiences loading and movement, are transmitted from the acetabulum or socket through the bone cement to the bone, probably with the result of local necroses and/or bone recession.

In order to overcome this problem it has been known to use a shell-like acetabulum whose edges are secured in the pelvis as disclosed in French patent specification 1,122,634 and whose shell-like recess, which receives either the natural femur head or an artifical metal or plastics femur head, is coated with a resilient material to damp impact loads transmitted via the joint to the bone. However, since the loading on the acetabulum may be as much as 300 kg, this known construction does not lead to a serviceable hip joint. That is, under loads of this nature, the femur head ceases to be able to move at all in a resilient layer or coating because of excessive friction. The resilient layer must therefore be given a strong load-resistant contact or sliding surface which, to prevent the resilient material from moving away and being extruded under load, should bear on the shell-like acetabulum at least in the fashion of a cover. Unfortunately, this rigid connection of the known construction leads to impact and vibrations being directly transmitted from the contact surface to the shell and therefore to the bone. Thus, the resilient layer has been found to have no effect.

Accordingly, it is an object of the invention to obviate loosening of an implanted acetabulum in a hip joint.

It is another object of the invention to avoid microvibrations in the interface between a pelvic bone and the bone cement used to implant an acetabulum.

Briefly, the invention provides an acetabulum for mounting in a pelvis comprising a rigid body defining an internal recess on one side for a femur head and having an anchorage surface on an opposite side, and a layer of highly resilient material secured to the anchor age surface. In addition, the layer of highly resilient material includes a plurality of external grooves and recesses for receiving bone cement when the acetabulum is implanted in a pelvis.

The rigid body can be made of any suitable metal or plastics material.

The term highly resilient material" is to be understood herein as denoting substances having a final aftercure hardness in Shore A values of less than or equal to s 90. As well as being resilient, the material must, of course, be compatible with the body and highly resistant to the body. The material should also have high shear strength and high tensile strength, more particularly high tear resistance. A silicone rubber commercially available under the registered trademark Silastic E RTV of the Dow Corning International Ltd. company has proved a very satisfactory substance. Of

course, other substances, such as natural rubber, can be used as the highly resilient material subject to meeting the conditions set.

The layer of resilient material serves to damp impact as well as vibrations. To this end, the resilient layer must be firmly anchored to the rigid body which, in turn, must be able to deal with the loads which occur which are, as already mentioned, up to 300 kilograms (kg). In order to achieve this, the acetabulum is provided with ribs on the anchorage surface, in known manner, as well as anchorage elements which extend peripherally at a varying spacing from the edge of the acetabulum. These anchorage elements can be, e.g., wire rings brazed to the ribs.

These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawingsin which:

FIG. 1 illustrates a side view of a rigid load-bearing acetabulum body according to the invention;

FIG. 2 illustrates a cross-sectional view of the body of FIG. 1;

FIG. 3 illustrates a side elevational view of a completed acetabulum accoding to the invention;

FIG. 4 illustrates a plan view of the acetabulum of FIG. 3; and

FIG. 5 illustrates a sectioned view similar to FIG. 2 showing an acetabulum anchored in a pelvis according to the invention.

Referring to FIGS. 1 and 2, the acetabulum body or socket 1 which is rigid and which does not distort permanently when subjected to the loads previously referred to, i.e., which is load bearing, is made in known manner of a metal alloy compatible with the human organism or of a physiologically innocuous plastics. The body 1 is formed with a part-spherical internal recess 2 on one side which can be seen in FIG. 2 and which is adapted to receive a femur head (not shown). In addition, an outside anchorage surface 3 of the acetabulum body 1 has, in known manner, integral ribs 4 disposed in upstanding manner and extending in a meridial direction. Generally, where such a body has been used as the acetabulum per se, often being anchored in the pelvis, the ribs 4 have served to prevent relative movements between the socket or acetabulum l and the material applied to the socket. Conventionally, such material has usually been a bone cement.

Referring to FIGS. 3, 4 and 5, in accordance with the invention, an intermediate layer 5 of highly resilient material is secured to the body 1 about the ribs 4. In order to improve the anchorage of the intermediate layer 5 on the surface 3, anchorage elements are provided in the form of wire rings 8'which are secured to the ribs 4, e.g., by brazing, and which extend peripherally at various distances from the peripheral edge of the acetabulum body 1.

The highly resilient substance for the layer 5 is, for instance, a silicone rubber known under the registered trademark Silastic E RTV of Dow Corning International Ltd. In addition, the outside surface of the rubber layer 5 is formed with grooves 6 which extend peripherally and meridianally as well as with recesses 7.

In order to apply the rubber composition to the anchorage surface 3, the body 1 is first located at a distance from a mold (not shown) forming the negative of the outside surface of the layer 5. After intimate mixing with the associated catalyst or cross-linking agent, Dow

Corning RTV catalyst E in the example mentioned, in the specified ratio of, e.g., 1:10, the silicone rubber is introduced into the mold, e.g., by pouring. Flowability can be increased, if necessary, by means of a diluent.

The silicone rubber specified polymerizes or vulcanizes at room temperatures of 25C within 24 hours after the addition of the catalyst, so that a non-shifting anchorage results between the body 1 and the layer 5. The resilient layer 5 cures much faster at higher temperatures. At room temperatures, the rubber specified reaches its final hardness of approximately Shore A 35 to 45 after a few days.

After the material for the layer 5 has reached its final hardness, the completed acetabulum 1 can be anchored conventionally in a pelvis (FIG. 5) by means ofa known bone cement 12, e.g., methyl methacrylate. The bone cement 12 which flows into artificial recesses 11 in the pelvis, which recesses 11 extend through the relatively compact bony tissue, forms anchorage pins 13 or projections or the like. The cement 12 also enters the grooves 6 and recesses 7, thus giving a non-shifting connection between the layer 5 and the bone cement 12. This connection is very well able to withstand turning and movements along the outside surface of the layer 5.

The vibration-damping effect of the intermediate layer 5 very likely depends upon the very considerable differences between the elasticity modulii of the body 1, of the components making the anchorage and of the bone. In the example described, these modulii, expressed in kp/mm are about 20,000 for the metal body, about two or three for the layer 5, about 100 to 200 for the bone cement and about 1000 for the actual bone. There is probably very little transmission of vibratory energy from the very soft silicone rubber to the less resilient bone cement 12, more particularly at the boundary or interface betweenthe layer 5 and the cement 12.

What is claimed is:

1. An acetabulum implant for mounting in a pelvis comprising a rigid body defining an internal recess on one side for receiving a femur head and having an anchorage surface on an opposite side, and a layer of highly resilient material secured to said anchorage surface, said highly resilient material having a final aftercure hardness in Shore A values of less than or equal to 90, the external surface of said layer including a plurality of external grooves therein and a plurality of recesses therein for receiving a suitable bone cement when implanted in a pelvis.

2. An acetabulum as set forth in claim 1 further comprising a plurality of integral ribs on said anchorage surface of said body extending into said layer and at least one anchorage element extending peripherally of said anchorage surface and said ribs.

3. An acetabulum as set forth in claim 2 comprising a plurality of said anchorage elements extending at various spacings from the peripheral edge of said body.

4. An acetabulum as set forth in claim 1 wherein said layer is made of silicone rubber.

5. An acetabulum as set forth in claim 1 wherein said rigid body is of cup-shape and said internal recess is part-spherical in shape.

6. An acetabulum as set forth in claim 5 further comprising a plurality of integral ribs on said anchorage surface extending into said layer.

7. An acetabulum as set forth in claim 6 wherein said layer is made of silicone rubber.

I UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION 3, ,9 Dated April 30, 197

Patent No.

Bernhard Georg Weber Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Insert the following on the title page of the patent;

This application is-based on Swiss Patent Application No. 1%7/72 filed February 1, 1972 to which the right of priority is claimed.

Signed and sealed this 17th day of September 1974.

(SEAL) Attest:

MCCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents USCOMM-DC 60376-5 69 U 5. GOVERNMENT PRINTING OFFICE I969 O366-334.

FORM po-loso (10459)

Claims (7)

1. An acetabulum implant for mounting in a pelvis comprising a rigid body defining an internal recess on one side for receiving a femur head and having an anchorage surface on an opposite side, and a layer of highly resilient material secured to said anchorage surface, said highly resilient material having a final aftercure hardness in Shore A values of less than or equal to 90, the external surface of said layer including a plurality of external grooves therein and a plurality of recesses therein for receiving a suitable bone cement when implanted in a pelvis.
2. An acetabulum as set forth in claim 1 further comprising a plurality of integral ribs on said anchorage surface of said body extending into said layer and at least one anchorage element extending peripherally of said anchorage surface and said ribs.
3. An acetabulum as set forth in claim 2 comprising a plurality of said anchorage elements extending at various spacings from the peripheral edge of said body.
4. An acetabulum as set forth in claim 1 wherein said layer is made of silicone rubber.
5. An acetabulum as set forth in claim 1 wherein said rigid body is of cup-shape and said internal recess is part-spherical in shape.
6. An acetabulum as set forth in claim 5 further comprising a plurality of integral ribs on said anchorage surface extending into said layer.
7. An acetabulum as set forth in claim 6 wherein said layer is made of silicone rubber.
US3806960A 1973-02-01 1973-02-01 Acetabulum implant Expired - Lifetime US3806960A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280233A (en) * 1979-02-15 1981-07-28 Raab S Bone connective prosthesis comprising a reinforcement element carrying a polymer layer having a varying modulus of elasticity
EP0297789A1 (en) * 1987-06-29 1989-01-04 Howmedica International Inc. Method of making a prosthetic component and component made according to the method
EP0298234A1 (en) * 1987-07-09 1989-01-11 Gebrüder Sulzer Aktiengesellschaft Acetabular cup
US4892548A (en) * 1982-01-12 1990-01-09 Gebruder Sulzer Joint socket
US5049158A (en) * 1990-04-20 1991-09-17 Boehringer Mannheim Corporation Acetabular cup assembly
EP0446559A1 (en) * 1990-03-13 1991-09-18 Gebrüder Sulzer Aktiengesellschaft Cement affixated plastic hip cup
WO1994028827A1 (en) * 1993-06-05 1994-12-22 Depuy International Ltd. A prosthesis component
US5405402A (en) * 1993-04-14 1995-04-11 Intermedics Orthopedics, Inc. Implantable prosthesis with radiographic marker
US5549700A (en) * 1993-09-07 1996-08-27 Ortho Development Corporation Segmented prosthetic articulation
US5782930A (en) * 1996-02-13 1998-07-21 Hommedica Inc. Polyetheretherketone (PEEK) retaining ring for an acetabular cup assembly
US20030074079A1 (en) * 1998-04-14 2003-04-17 Osteoimplant Technology, Inc. Differential porosity prosthetic hip system
US20030105529A1 (en) * 2001-11-16 2003-06-05 Synder Duane G. Prosthetic cup assembly having increased assembly congruency
US6610097B2 (en) 2000-03-15 2003-08-26 Depuy Orthopaedics, Inc. Prosthetic cup assembly which includes components possessing self-locking taper and associated method
US20040010319A1 (en) * 1998-04-14 2004-01-15 Osteoimplant Technology Inc. Intrinsic stability in a total hip stem
US6966932B1 (en) 2002-02-05 2005-11-22 Biomet, Inc. Composite acetabular component
US20050261777A1 (en) * 2003-01-31 2005-11-24 Ortho Development Corporation Polymeric acetabular cup
US20090326669A1 (en) * 2006-08-04 2009-12-31 Roman Preuss Insertion of vibration-damping elements in prosthetic systems for the manipulation and damping of natural frequencies
US8123815B2 (en) 2008-11-24 2012-02-28 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis
US8308810B2 (en) 2009-07-14 2012-11-13 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668531A (en) * 1952-02-15 1954-02-09 Edward J Haboush Prosthesis for hip joint
FR1122634A (en) * 1955-02-25 1956-09-11 Improvements in joint prostheses
US3064645A (en) * 1961-01-23 1962-11-20 Raymond P Ficat Damped prosthesis forming a substitute for the coxo-femoral articulation
US3685058A (en) * 1970-10-19 1972-08-22 Raymond G Tronzo Hip prosthesis

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2668531A (en) * 1952-02-15 1954-02-09 Edward J Haboush Prosthesis for hip joint
FR1122634A (en) * 1955-02-25 1956-09-11 Improvements in joint prostheses
US3064645A (en) * 1961-01-23 1962-11-20 Raymond P Ficat Damped prosthesis forming a substitute for the coxo-femoral articulation
US3685058A (en) * 1970-10-19 1972-08-22 Raymond G Tronzo Hip prosthesis

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4280233A (en) * 1979-02-15 1981-07-28 Raab S Bone connective prosthesis comprising a reinforcement element carrying a polymer layer having a varying modulus of elasticity
US4892548A (en) * 1982-01-12 1990-01-09 Gebruder Sulzer Joint socket
EP0297789A1 (en) * 1987-06-29 1989-01-04 Howmedica International Inc. Method of making a prosthetic component and component made according to the method
EP0298234A1 (en) * 1987-07-09 1989-01-11 Gebrüder Sulzer Aktiengesellschaft Acetabular cup
US4908033A (en) * 1987-07-09 1990-03-13 Sulzer Brothers Limited Hip joint acetabulum
EP0446559A1 (en) * 1990-03-13 1991-09-18 Gebrüder Sulzer Aktiengesellschaft Cement affixated plastic hip cup
US5171287A (en) * 1990-03-13 1992-12-15 Sulzer Brothers Limited Plastic acetabulum
US5049158A (en) * 1990-04-20 1991-09-17 Boehringer Mannheim Corporation Acetabular cup assembly
US5405402A (en) * 1993-04-14 1995-04-11 Intermedics Orthopedics, Inc. Implantable prosthesis with radiographic marker
WO1994028827A1 (en) * 1993-06-05 1994-12-22 Depuy International Ltd. A prosthesis component
US5549700A (en) * 1993-09-07 1996-08-27 Ortho Development Corporation Segmented prosthetic articulation
US5782930A (en) * 1996-02-13 1998-07-21 Hommedica Inc. Polyetheretherketone (PEEK) retaining ring for an acetabular cup assembly
US20070043448A1 (en) * 1998-04-14 2007-02-22 Encore Medical Asset Corporation Intrinsic stability in a total hip stem
US7323013B2 (en) 1998-04-14 2008-01-29 Encore Medical Asset Corporation Differential porosity prosthetic hip system
US20030074079A1 (en) * 1998-04-14 2003-04-17 Osteoimplant Technology, Inc. Differential porosity prosthetic hip system
US20040010319A1 (en) * 1998-04-14 2004-01-15 Osteoimplant Technology Inc. Intrinsic stability in a total hip stem
US6610097B2 (en) 2000-03-15 2003-08-26 Depuy Orthopaedics, Inc. Prosthetic cup assembly which includes components possessing self-locking taper and associated method
US20030105529A1 (en) * 2001-11-16 2003-06-05 Synder Duane G. Prosthetic cup assembly having increased assembly congruency
US7326253B2 (en) 2001-11-16 2008-02-05 Depuy Products, Inc. Prosthetic cup assembly having increased assembly congruency
US6966932B1 (en) 2002-02-05 2005-11-22 Biomet, Inc. Composite acetabular component
US20050261777A1 (en) * 2003-01-31 2005-11-24 Ortho Development Corporation Polymeric acetabular cup
US7402177B2 (en) 2003-01-31 2008-07-22 Ortho Development Corporation Polymeric acetabular cup
US20090326669A1 (en) * 2006-08-04 2009-12-31 Roman Preuss Insertion of vibration-damping elements in prosthetic systems for the manipulation and damping of natural frequencies
US8226728B2 (en) * 2006-08-04 2012-07-24 Ceramtec Gmbh Insertion of vibration-damping elements in prosthetic systems for the manipulation and damping of natural frequencies
US8123815B2 (en) 2008-11-24 2012-02-28 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis
US9445903B2 (en) 2008-11-24 2016-09-20 Biomet Manufacturing, Llc Multi-bearing acetabular prosthesis
US8308810B2 (en) 2009-07-14 2012-11-13 Biomet Manufacturing Corp. Multiple bearing acetabular prosthesis
US9445904B2 (en) 2009-07-14 2016-09-20 Biomet Manufacturing, Llc Multiple bearing acetabular prosthesis

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