Acetabular Cup Fixation

• US 20090210067A1
• Filed: 02/13/2009
• Published: 08/20/2009
• Est. Priority Date: 02/20/2008
• Status: Abandoned Application

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Meridew, Jason D.
• Application Number:
  US12/370,951
• Publication Number:
  US 20090210067A1
• Time in Patent Office: Days
• US Class Current: 623/22.240
• CPC Class Codes: A61B 17/8042 the additional component being a cover over the screw head
• CPC Class Codes: A61B 17/8047 wherein the additional element surrounds the screw head in the plate hole A61B17/8052 takes precedence
• CPC Class Codes: A61B 17/8052 immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
• CPC Class Codes: A61B 17/8057 the interlocking form comprising a thread
• CPC Class Codes: A61B 17/8685 comprising multiple separate parts
• 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 2002/30378 Spherically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30485 plastically deformable
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/3401 with radial apertures, e.g. radial bores for receiving fixation screws
• CPC Class Codes: A61F 2002/3403 Polar aperture
• CPC Class Codes: A61F 2002/3446 Single cups
• 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 2250/0006 for adjusting angular orientation

Abstract

An acetabular cup system includes an acetabular cup having a wall with an inner surface and an outer surface. The acetabular cup includes a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface. The acetabular cup system also includes a fixation fastener including a head and a shaft with a bone-anchoring portion. The fastener can be inserted though the fixation opening. The head includes a first head portion engageable with the first wall portion and a second head portion engageable with the second wall portion.

Claims

1. An acetabular cup system comprising:

an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface; and

a fixation fastener including a head and a shaft with a bone-anchoring portion, the fastener insertable though the fixation opening, the head including a first head portion engageable with the first wall portion and a second head portion engageable with the second wall portion.

2. The acetabular cup system of claim 1, wherein the first head portion is externally threaded and the first wall portion is internally threaded.

3. The acetabular cup system of claim 2, wherein the second head portion is unthreaded and tapered and the second wall portion is unthreaded and tapered forming a taper lock connection with the second head portion, and wherein the first head portion is contiguous to the second head portion.

4. The acetabular cup system of claim 3, wherein the first head portion is cylindrical and the first wall portion is cylindrical.

5. The acetabular cup system of claim 3, wherein the first head portion is tapered and the first wall portion is tapered.

6. The acetabular cup system of claim 1, wherein the second head portion is externally threaded and the second wall portion is internally threaded.

7. The acetabular cup system of claim 6, wherein the first head portion is unthreaded and the first wall portion is unthreaded.

8. The acetabular cup system of claim 7, wherein the first head portion is tapered and the first wall portion is tapered.

9. The acetabular cup system of claim 1, wherein the first head portion is substantially spherical and unthreaded and the second head portion is cylindrical and threaded with self-tapping threads.

10. The acetabular cup system of claim 9, wherein the fixation opening is unthreaded and the first wall portion is substantially spherical and the second wall portion is substantially cylindrical.

11. The acetabular cup system of claim 1, wherein the first head portion is substantially spherical.

12. The acetabular cup system of claim 11, wherein the first head portion is externally threaded.

13. The acetabular cup system of claim 12, wherein the first wall portion is substantially spherical and threaded.

14. An acetabular cup system comprising:

an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening including a first wall portion adjacent to the inner surface and a second wall portion adjacent to the outer surface, the first wall portion being internally threaded and the second wall portion being unthreaded and tapered; and

a fixation fastener including a head and a shaft with a bone anchoring portion, the fastener insertable though the fixation opening, the head including a first head portion threadably engageable with the first wall portion and a second head portion tapered for taper lock connection with the second wall portion.

15. The acetabular cup system of claim 14, wherein the first head portion is substantially cylindrical and the first wall portion is substantially cylindrical.

16. The acetabular cup system of claim 14, wherein the first head portion is tapered and the first wall portion is tapered.

17. An acetabular cup system comprising:

an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having an unthreaded surface; and

a fixation fastener including a head and a shaft with a bone anchoring portion, the fastener insertable though the fixation opening, the head including a threaded portion with self-tapping threads threadably engageable with the fixation opening.

18. The acetabular cup system of claim 17, wherein the threaded portion of the fixation fastener is tapered.

19. The acetabular cup system of claim 17, wherein the fixation opening is tapered.

20. An acetabular cup system comprising:

an acetabular cup having a wall with an inner surface and an outer surface, the acetabular cup including a fixation opening through the wall, the fixation opening having a threaded portion; and

a fixation fastener including an inner head attached to a bone-anchoring shaft and an outer head pivotably coupled to the inner head, the outer head including a threaded portion threadably engageable with the fixation opening, the inner head including a driver engagement recess.