Compliant fixation of external prosthesis

• US 7,141,073 B2
• Filed: 03/09/2004
• Issued: 11/28/2006
• Est. Priority Date: 11/01/1993
• Status: Expired due to Fees

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: O'Donnell, Richard J, White, John R, May, Brian M
• Primary Examiner(s): SNOW, BRUCE EDWARD
• Application Number:
  US10/797,692
• Publication Number:
  US 20040172138A1
• Time in Patent Office: 994 Days
• Field of Search: 623 2344- 2347, 623/32
• US Class Current: 623/32
• CPC Class Codes: A61B 17/164 intramedullary
• CPC Class Codes: A61B 17/1668 for the upper femur A61B17/164 takes precedence
• CPC Class Codes: A61B 17/1725 for applying transverse screws or pins through intramedullary nails or pins
• CPC Class Codes: A61B 17/7216 for bone lengthening or compression A61B17/7258 takes precedence
• CPC Class Codes: A61B 2017/1602 Mills
• CPC Class Codes: A61F 2/28 Bones joints A61F2/30
• CPC Class Codes: A61F 2/3601 for replacing only the epiphyseal or metaphyseal parts of the femur, e.g. endoprosthetic femoral heads or necks directly fixed to the natural femur by internal fixation devices non-prosthetic internal fixation devices for the femoral head or neck A61B17/74
• CPC Class Codes: A61F 2/3607 including proximal or total replacement of the femur
• CPC Class Codes: A61F 2002/30535 Special structural features of bone or joint prostheses not otherwise provided for
• 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 2250/0058 Additional features; Implant or prostheses properties not otherwise provided for

Abstract

A fixation device and method for attaching an external prosthesis to a bone. The fixation device includes a main body having a compliant portion operable to be expanded and contracted. The main body has a first end fixedly retained in the bone and a second end coupled to an extension for receiving the external prosthesis. The main body and the extension define respectively first and second engagement surfaces for constraining a bone graft therebetween.

Claims

1. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the main body is coupled to the extension by a Morse taper connection.

2. The device of claim 1, wherein the main body includes a female taper receiving a male taper of the extension.

3. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the extension includes internal threading for receiving the external prosthesis.

4. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the first engagement surface is a superior shoulder of the main body.

5. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone craft between the first and second engagement surfaces, wherein the second engagement surface is a ring coupled to the extension.

6. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the extension is integral to the main body.

7. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the extension includes a plurality of suture apertures for attaching skin.

8. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the main body includes a bone tray operable to engage a prepared bone surface.

9. The device of claim 8, wherein the main body further includes a post attached to the bone tray.

10. The device of claim 9, wherein the post is threadably coupled to the compliant portion.

11. The device of claim 9, wherein upon rotating the post, the compliant portion is expanded to a desired condition of expansion after the main body is attached to the bone.

12. The device of claim 8, wherein the compliant portion is directly attached to the bone tray.

13. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the main body further includes a plurality of apertures for receiving bone fasteners.

14. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone araft between the first and second engagement surfaces, wherein the main body is attached to the bone by an anchor.

15. The device of claim 14, wherein the compliant portion is integral with the anchor.

16. The device of claim 15, wherein the compliant portion is shaped as a helical spring.

17. A fixation device for attaching an external prosthesis to a bone, the fixation device comprising a main body including a compliant portion operable to be expanded and contracted, the main body having a first end operable to be fixedly retained in the bone and a second end coupled to an extension configured for receiving the external prosthesis, wherein the main body and the extension define respectively first and second engagement surfaces configured for constraining a bone graft between the first and second engagement surfaces, wherein the compliant portion includes spring washers.

18. A fixation device for attaching an external knee prosthesis to a distal femoral bone having an attached patella, the fixation device comprising:

a main body operable to engage a prepared femoral surface, the main body having a superior shoulder;

an extension coupled to the main body with a taper to taper connection, the extension including a inferior ring, the inferior ring and the superior shoulder configured to constraint the patella therebetween;

an anchor coupled to the main body and operable to be fixedly retained within the femoral bone; and

a compliant portion operable to be expanded and contracted, the compliant portion disposed between the body and the anchor.

19. The device of claim 18, wherein the main body further includes a femoral tray operable to engage the prepared femoral surface.

20. The device of claim 18, wherein the compliant portion is integral with the anchor.

21. The device of claim 18, wherein the compliant portion is shaped as a helical spring.

22. The device of claim 18, wherein the anchor includes external helical threads operable to fixedly attach the anchor within a cavity formed within the femoral bone.

23. The device of claim 18, wherein the main body includes a threaded post operable to threadably pass through the femoral tray.

24. The device of claim 23, wherein the post is threadably attached to the compliant portion and is operable to adjust a force applied to the compliant portion.

25. A compliant fixation device for attaching an external prosthesis to a bone having an attached bone graft, the fixation device comprising a compliant portion, first and second engagement surfaces configured for constraining the attached bone graft between the first and second engagement surfaces, and an extension including a bore for receiving a portion of the external prosthesis, the fixation device configured for receiving an external prosthesis at one end, wherein the extension includes a Morse taper connection.

26. The compliant fixation device of claim 25, wherein the bone is a distal femur with an attached patella, and the first and second engagement surfaces are configured to retain the patella.

27. The compliant fixation device of claim 26, wherein the second engagement surface is a patella cap.

28. The compliant fixation device of claim 25, wherein the extension is modularly coupled to the fixation device.

29. The compliant fixation device of claim 25, further comprising an anchor coupled to the compliant portion.

30. A compliant fixation device for attaching an external prosthesis to a bone having an attached bone graft, the fixation device comprising a compliant portion, first and second engagement surfaces configured for constraining the attached bone graft between the first and second engagement surfaces, and an extension including a bore for receiving a portion of the external prosthesis, the fixation device configured for receiving an external prosthesis at one end, wherein the extension includes a ring having suture apertures for capturing skin.