METAL-ON-METAL MODULAR HYBRID LINER

• US 20100145466A1
• Filed: 12/08/2008
• Published: 06/10/2010
• Est. Priority Date: 12/08/2008
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Slone, W. Jason
• Granted Patent: US 8,007,539 B2
• Time in Patent Office: Days
• US Class Current: 623/22.150
• CPC Class Codes: A61F 2/30734 Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2002/30014 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2002/30112 Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30378 Spherically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2002/30474 using an intermediate sleeve interposed between both prosthetic parts to be coupled
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/30505 spring biased
• CPC Class Codes: A61F 2002/3054 about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
• CPC Class Codes: A61F 2002/30733 Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/3079 Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/30822 Circumferential grooves
• CPC Class Codes: A61F 2002/30823 having the shape of a reverse dovetail
• CPC Class Codes: A61F 2002/3241 having a ring, e.g. for locking the femoral head into the acetabular cup
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2230/0004 : Rounded shapes, e.g. with rounded corners
• CPC Class Codes: A61F 2250/0018 : differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2310/00011 : Metals or alloys
• CPC Class Codes: A61F 2310/00179 : Ceramics or ceramic-like structures

Abstract

A prosthetic joint assembly that includes a shell including an inner surface. The assembly also includes a bearing member including an outer surface. The bearing member is received by the shell such that the outer surface of the bearing member is adjacent the inner surface of the shell. Furthermore, the joint assembly includes a compressible member that is rigidly fixed to the inner surface of the shell or the outer surface of the bearing member to only cover a portion thereof. The compressible member is made of a material that is different from the shell or the bearing member.

Claims

1. A prosthetic joint assembly comprising:

a shell including an inner surface;

a bearing member including an outer surface, the bearing member being received by the shell such that the outer surface of the bearing member is adjacent the inner surface of the shell; and

a compressible member that is rigidly fixed to one of the inner surface of the shell and the outer surface of the bearing member to only cover a portion thereof, the compressible member being made of a material that is different from the one of the shell and the bearing member.

2. The prosthetic joint assembly of claim 1, wherein the bearing member includes a recess, and wherein the compressible member is disposed within the recess.

3. The prosthetic joint assembly of claim 2, wherein the compressible member extends out of the recess.

4. The prosthetic joint assembly of claim 1, wherein the bearing member includes a rim, and wherein the compressible member is annular and extends about the rim.

5. The prosthetic joint assembly of claim 1, wherein the bearing member includes a rim and an inner radius on the rim.

6. The prosthetic joint assembly of claim 1, wherein the bearing member includes at least one of a projection and a recessed surface that limits relative rotation between the shell and the bearing member, wherein the compressible member covers the at least one of the projection and the recessed surface so as to be disposed between the shell and the at least one of the projection and the recessed surface.

7. The prosthetic joint assembly of claim 1, wherein the bearing member includes an apex and a rim, and wherein the compressible member is rigidly fixed to the bearing member between the apex and the rim.

8. The prosthetic joint assembly of claim 1, wherein a modulus of elasticity of the compressible member is lower than a modulus of elasticity of the bearing member.

9. The prosthetic joint assembly of claim 1, wherein the shell is made of metal, the bearing member is made of a metal, and the compressible member is made of a polymer.

10. The prosthetic joint assembly of claim 1, wherein the shell includes a groove, and wherein the compressible member includes a groove, and further comprising a ring member that is received in the groove of the shell and the groove of the compressible member.

11. The prosthetic joint assembly of claim 1, wherein the bearing member defines a first annular recess and a second annular recess, the first and second annular recesses disposed in spaced relationship to each other, and further comprising a first compressible member and a second compressible member, the first compressible member being disposed in the first annular recess, the first compressible member defining an annular groove, and the second compressible member being disposed in the second annular recess.

12. A liner assembly of a prosthetic joint assembly having a ring member and a shell that includes an inner surface with a groove that receives the ring member, the liner assembly comprising:

a bearing member that includes an outer surface, the bearing member being received by the shell such that the outer surface of the bearing member is adjacent the inner surface of the shell; and

a compressible member that is rigidly fixed to the outer surface of the bearing member, the compressible member being made of a material that is different than that of the bearing member, the compressible member including a groove that receives the ring member to limit relative movement between the bearing member and the shell.

13. The liner assembly of claim 12, wherein the bearing member is made of a metal and the compressible member is made of a polymer.

14. The liner assembly of claim 12, wherein the bearing member includes a recess, and wherein the compressible member is disposed within the recess such that the groove of the compressible member extends about the recess.

15. The liner assembly of claim 14, wherein the recess includes a lower lip having a width that is greater than an inner width of the ring member.

16. A prosthetic joint assembly comprising:

a shell made of at least one of a metallic material and a ceramic material;

a bearing member that is made of at least one of a metallic material and a ceramic material, the bearing member being received by the shell; and

an anti-rotation device that includes a protrusion and a recessed surface, the protrusion fixed to one of the shell and the bearing member, the recessed surface included in the other of the shell and the bearing member, the recessed surface receiving the protrusion to limit relative rotation between the shell and the bearing member.

17. The prosthetic joint assembly of claim 16, further comprising a compressible member that is rigidly fixed to at least one of the shell and the bearing member so as to be disposed between the protrusion and the recessed surface.

18. The prosthetic joint assembly of claim 17, wherein the compressible member has a modulus of elasticity that is lower than a modulus of elasticity of the bearing member and a modulus of elasticity of the shell.

19. The prosthetic implant of claim 16, wherein the compressible member covers only a portion of an outer surface of the bearing member.

20. A method of implanting a prosthesis assembly comprising:

selecting a shell that includes a groove;

selecting a liner assembly that includes a bearing member and a compressible member that is rigidly fixed to an outer surface of the bearing member, the compressible member only partially covering the outer surface and including a groove, the compressible member being made out of a material that is different from the bearing member; and

operatively securing the liner assembly within the shell with a ring member such that the ring member is disposed within the groove of the shell and the groove of the compressible member.

21. The method of claim 20, further comprising molding the compressible member to rigidly fix the compressible member to the liner assembly.

22. A prosthetic joint assembly comprising:

a metallic shell including an inner surface, a groove, and a rim;

a metallic bearing member including an outer surface, a rim, and an apex, the bearing member being received by the shell such that the outer surface of the bearing member is adjacent the inner surface of the shell;

an anti-rotation device that includes a projection that projects from the rim of the shell and a recessed surface included on the rim of the bearing member, the projection received by the recessed surface to limit relative rotation between the bearing member and the shell;

a first annular polymeric compressible member that is rigidly fixed to the outer surface of the bearing member on the rim, the first compressible member including a groove, the first compressible member disposed between the recessed surface and the projection, the first compressible member also having a modulus of elasticity lower than that of the shell and the bearing member;

a second annular polymeric compressible member that is rigidly fixed to the outer surface of the bearing member between the rim and the apex, the second compressible member also having a modulus of elasticity lower than that of the shell and the bearing member; and

a ring member that is disposed within the groove of the shell and the groove of the first compressible member, the ring member limiting axial movement of the bearing member away from the shell.