Multiple Bearing Acetabular Prosthesis

• US 20110015753A1
• Filed: 07/14/2009
• Published: 01/20/2011
• Est. Priority Date: 07/14/2009
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Meridew, Jason D.
• Granted Patent: US 8,308,810 B2
• Time in Patent Office: Days
• US Class Current: 623/22.24
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30364 Rotation about the common longitudinal axis
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30428 made by inserting a protrusion into a slot
• CPC Class Codes: A61F 2002/30487 Circumferential cooperating grooves and beads on cooperating lateral surfaces of a mainly longitudinal connection
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30607 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2002/30818 castellated or crenellated
• CPC Class Codes: A61F 2002/3092 having an open-celled or open-pored structure
• CPC Class Codes: A61F 2002/3093 for promoting ingrowth of bone tissue
• CPC Class Codes: A61F 2002/3241 having a ring, e.g. for locking the femoral head into the acetabular cup
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3429 with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
• 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 2250/0062 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2310/00598 Coating or prosthesis-covering structure made of compounds based on metal oxides or hydroxides

Abstract

An acetabular prosthesis assembly can include an acetabular cup and a first liner. The acetabular cup can have an outer surface, an inner surface and an upper rim extending between the outer surface and the inner surface. The acetabular cup can have a cup connection portion including a groove formed on an upper face of the upper rim. The first liner can have an outer cup engaging surface and a liner connection portion that extends from a flange of the first liner. The liner connection portion can have a finger that is received by the groove formed on the upper face of the acetabular cup that selectively couples the liner connection portion with the cup connection portion in an assembled position.

Claims

1. An acetabular prosthesis assembly comprising:

an acetabular cup having an outer surface, an inner surface and an upper rim extending between the outer surface and the inner surface, the acetabular cup having a cup connection portion including a groove formed on an upper face of the upper rim; and

a first liner having an outer cup engaging surface and a liner connection portion that extends from a flange of the first liner, the liner connection portion having a finger that is received by the groove that selectively couples the liner connection portion with the cup connection portion in an assembled position.

2. The acetabular prosthesis assembly of claim 1 wherein the cup connection portion is collectively formed by an inner wall and an outer wall offset by the groove, the groove extending annularly around the upper rim.

3. The acetabular prosthesis of claim 2 wherein the inner and outer walls are generally parallel to an axis through an apex of the acetabular cup.

4. The acetabular prosthesis assembly of claim 2 wherein an undercut is formed in the groove on one of the inner and outer walls.

5. The acetabular prosthesis assembly of claim 4 wherein the first liner includes a protrusion extending from the finger that nests in the undercut of the acetabular cup in the assembled position.

6. The acetabular prosthesis assembly of claim 5 wherein the cup connection portion and liner connection portion include a plurality of alternating inset and outset portions that cooperatively mate in the assembled position.

7. The acetabular prosthesis assembly of claim 2 wherein the acetabular cup further comprises an anti-rotation counterbore defined by the inner liner engaging surface and wherein the first liner includes an anti-rotation projection extending from the outer cup engaging surface that cooperatively locates at the anti-rotation counterbore of the acetabular cup in the assembled position.

8. The acetabular prosthesis assembly of claim 1 wherein the cup connection portion further comprises a plurality of grooves formed radially on the upper face of the upper rim.

9. The acetabular prosthesis assembly of claim 8 wherein the liner connection portion further comprises a plurality of radial flanges each having a finger that selectively mates with selected grooves of the cup connection portion in an assembled position.

10. The acetabular prosthesis assembly of claim 9 wherein each of the fingers have extending protrusion portions that selectively locate within cutout portions formed on the upper rim at the plurality of grooves.

11. The acetabular prosthesis assembly of claim 1, wherein the first liner is formed of polyethylene.

12. The acetabular prosthesis assembly of claim 1, further comprising:

a second liner formed of metal, the second liner having a male tapered portion that selectively engages a complementary female tapered portion formed on the inner liner engaging surface of the acetabular cup in an assembled position; and

a third liner formed of ceramic and having a male tapered portion that selectively engages the female tapered portion on the inner liner engaging surface of the acetabular cup in an assembled position;

wherein the acetabular cup selectively and alternatively mates with any of the first, second or third liners.

13. An acetabular prosthesis assembly comprising:

an acetabular cup having an outer bone engaging surface, an inner liner engaging surface and a cup connection portion formed at an upper rim, the cup connection portion collectively formed by an inner wall and an outer wall offset by an annular groove on the upper rim, wherein a portion of the inner liner engaging surface is common to the inner wall and a portion of the outer bone engaging surface is common to the outer wall; and

a first liner having an outer cup engaging surface and a liner connection portion that extends from a flange of the first liner, the liner connection portion having an annular finger that is received by the annular groove of the acetabular cup that selectively couples the liner connection portion with the cup connection portion in an assembled position.

14. The acetabular prosthesis assembly of claim 13 wherein the acetabular cup further comprises an anti-rotation counterbore defined by the inner liner engaging surface.

15. The acetabular prosthesis assembly of claim 14 wherein the acetabular cup further comprises a threaded bore located within the anti-rotation counterbore that passes entirely through the acetabular cup.

16. The acetabular prosthesis assembly of claim 14 wherein the anti-rotation counterbore includes a series of alternating inset and outset portions.

17. The acetabular prosthesis assembly of claim 14 wherein the first liner includes an anti-rotation projection extending from the outer cup engaging surface that cooperatively locates at the anti-rotation counterbore of the acetabular cup in the assembled position.

18. The acetabular prosthesis assembly of claim 17 wherein the anti-rotation projection defines a series of inset and outset portions that cooperatively mate with corresponding inset and outset portions of the acetabular cup in the assembled position.

19. The acetabular prosthesis assembly of claim 13 wherein the inner liner engaging surface defines a cup cavity and wherein the cup connection portion is formed outside of the cup cavity.

20. The acetabular prosthesis assembly of claim 13 wherein the inner wall includes an undercut formed from the annular groove.

21. The acetabular prosthesis assembly of claim 20 wherein the undercut is formed into one of the inner wall or the outer wall.

22. The acetabular prosthesis assembly of claim 20 wherein the first liner includes a protrusion extending from the annular finger that nests in the undercut of the acetabular cup in the assembled position.

23. The acetabular prosthesis assembly of claim 22 wherein the annular finger is flexible such that the annular finger flexes radially outwardly during advancement of the liner around the inner wall until the protrusion reaches the undercut of the acetabular cup in the assembled position.

24. The acetabular prosthesis assembly of claim 22 wherein the annular finger includes at least one relief notch formed therein.

25. The acetabular prosthesis assembly of claim 13, wherein the first liner is formed of polyethylene.

26. The acetabular prosthesis assembly of claim 13, further comprising:

a second liner formed of cobalt-chromium, the second liner having a male tapered portion that selectively engages a complementary female tapered portion formed on the inner liner engaging surface of the acetabular cup in an assembled position; and

a third liner formed of ceramic and having a male tapered portion that selectively engages the female tapered portion on the inner liner engaging surface of the acetabular cup in an assembled position;

wherein the acetabular cup selectively and alternatively mates with any of the first, second or third liners.

27. An acetabular prosthesis assembly comprising:

an acetabular cup having an outer bone engaging surface, an inner liner engaging surface and an upper rim extending between the outer bone engaging surface and the inner liner engaging surface, the acetabular cup having a cup connection portion including an annular groove formed between inner and outer walls on an upper face of the upper rim, one of the inner and outer walls having an undercut formed from the groove; and

a liner having an outer cup engaging surface and a liner connection portion including a protrusion extending from a finger that extends from a flange of the first liner, the finger being received by the groove formed on the upper face of the acetabular cup whereby the protrusion locates beneath the undercut and selectively couples the liner connection portion with the cup connection portion in an assembled position.