Modular acetabular reinforcement system

• US 5,871,548 A
• Filed: 12/07/1996
• Issued: 02/16/1999
• Est. Priority Date: 12/07/1996
• Status: Expired due to Term

• Current Assignee: DePuy Orthopaedics Incorporated (Johnson & Johnson)
• Original Assignee: Johnson and Johnson Professional Inc (Johnson & Johnson)
• Inventors: Revie, Ian, Gross, Allan E., Cornell, Alan, Sanders, Anthony P.
• Primary Examiner(s): Prebilic, Paul B.
• Application Number:
  US08/762,885
• Time in Patent Office: 801 Days
• Field of Search: 623/22, 623/23, 606/71
• US Class Current: 623/22.36
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/34 Acetabular cups
• CPC Class Codes: A61F 2002/30153 rectangular
• CPC Class Codes: A61F 2002/30156 triangular
• CPC Class Codes: A61F 2002/30168 L-shaped
• CPC Class Codes: A61F 2002/30172 T-shaped
• CPC Class Codes: A61F 2002/30181 Y-shaped
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30485 plastically deformable
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30624 Hinged joint, e.g. with transverse axle restricting the movement
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30894 inclined obliquely with respect to each other
• 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 2002/3412 with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
• CPC Class Codes: A61F 2002/343 partial, i.e. not extending along the entire equatorial circumference
• CPC Class Codes: A61F 2002/3432 having apertures 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 2220/0041 : using additional screws, bolts, dowels or rivets, e.g. connecting screws
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0023 : triangular
• CPC Class Codes: A61F 2230/0043 : L-shaped
• CPC Class Codes: A61F 2230/0052 : T-shaped
• CPC Class Codes: A61F 2230/006 : Y-shaped
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys
• CPC Class Codes: A61F 2310/00029 : Cobalt-based alloys, e.g. Co-Cr alloys or Vitallium

Abstract

A modular acetabular reinforcement system includes a substantially cup-shaped reinforcement body having a peripheral flange portion. One or more fixation wings, of various sizes and shapes, are selectively and separately attachable to the flange portion of the reinforcement body. The system is mountable within the acetabulum of a patient to reinforce the acetabulum and to serve as a platform for other prosthesis components such as an acetabular shell.

Claims

1. A modular acetabular reinforcement system, comprising:

a metallic reinforcement body having dome and rim ends, and at least one integrally formed metallic peripheral flange portion extending along at least a portion of a perimeter of the rim end of the metallic reinforcement body;

at least one fixation wing, each of the at least one fixation wing being removably attached to the integral flange portion of the reinforcement body and each of the at least one wing having a first end attachable to integral flange portion of the reinforcement body and an opposed, second end; and

at least one bone fixation hole disposed in each of the at least one fixation wing.

2. The system of claim 1 wherein the reinforcement body further comprises at least one peripheral flange portion extending along at least a portion of a perimeter of the rim end.

3. The system of claim 2 wherein the reinforcement body includes an outer, bone-engaging surface and an opposed inner surface, the outer bone-engaging surface being adapted to mount within the natural acetabulum of a patient.

4. The system of claim 3 wherein the rim and dome ends are each open.

5. The system of claim 4 wherein the rim end has a diameter that is greater than the dome end.

6. The system of claim 1 wherein at least one bone fixation hole is disposed in the reinforcement body.

7. The system of claim 6 wherein the at least one bone fixation hole is a screw hole.

8. The system of claim 7 further comprising one or more fixation elements effective to affix the reinforcement body within the acetabulum.

9. The system of claim 2 wherein at least one flange fixation hole is disposed in the flange portion.

10. The system of claim 9 further comprising one or more fixation elements that cooperate with the at least one flange fixation hole to selectively join each of the at least one fixation wings to the flange portion of the reinforcement body.

11. The system of claim 1 wherein a plurality of bone fixation holes are disposed along the length of each of the at least one fixation wing, the bone fixation holes being effective to assist in securing each of the at least one fixation wing to pelvic bone.

12. The system of claim 11 further comprising a plurality of bone screws which, in cooperation with the at least one bone fixation hole, secure the at least one fixation wing to pelvic bone.

13. The system of claim 12 wherein each of the at least one fixation wing are of a structure in which the first end is narrower than the second end.

14. The system of claim 12 wherein each of the at least one fixation wing are substantially L-shaped such that the second end of each fixation wing includes a segment that extends substantially orthogonally to the first end of the fixation wing.

15. The system of claim 12 wherein each of the at least one fixation wing are substantially T-shaped, wherein a leg portion represents the first end and a head portion represents the second end.

16. The system of claim 12 wherein each of the at least one fixation wing are rectangular.

17. The system of claim 1 wherein the length of each of the at least one fixation wing is in the range of about 20 to 70 mm.

18. The system of claim 1 further comprising a means for attaching each of the at least one fixation wing to the flange portion of the reinforcement body.

19. The system of claim 1 wherein the flange portion is discontinuous.

20. A modular acetabular reinforcement system, comprising:

a substantially cup-shaped reinforcement body having a first end mountable within a patient'"'"'s acetabulum and an opposed second end mountable adjacent a lip of the acetabulum, the second end including an integrally formed flange portion extending along at least a portion of a perimeter thereof;

a plurality of removable fixation wings, each fixation wing being selectively attached to the reinforcement body and having a first end attachable to the integrally formed flange portion of the fixation body and an opposed, second end attachable to bone;

means for selectively affixing the first end of at least one of the fixation wings to the flange;

at least one bone fixation hole disposed between the first and second ends of the fixation wing; and

at least one bone fixation element for affixing the second end of the fixation wing to pelvic bone.

21. The system of claim 20 further comprising one or more bone fixation holes disposed in the reinforcement body, and one or more bone screws insertable within the at least one bone fixation holes to secure the reinforcement body within a patient'"'"'s acetabulum.

22. The system of claim 20 wherein the first and second ends of the reinforcement body are open ends.

23. The system of claim 20 wherein the means for selectively affixing comprises rivets.

24. The system of claim 20 wherein the means for selectively affixing comprises threaded fixation elements.