Instrumentation And Method For Implanting A Curved Stem Tibial Tray

• US 20080183177A1
• Filed: 03/20/2008
• Published: 07/31/2008
• Est. Priority Date: 06/09/2005
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Fox, Duke, A., Metzger, Robert, Hoeppner, Jacy C., Detlefsen, Richard
• Granted Patent: US 8,002,777 B2
• Time in Patent Office: Days
• US Class Current: 606/88
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1675 for the knee
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence

Abstract

A punch assembly for preparing a tibia bone for a prosthesis includes a static component configured to be supported by the tibia bone and a dynamic component that includes a punch having a stem. The dynamic component is supported for movement relative to the static component along a generally arcuate path to prepare an aperture having an arcuate contour in the tibia bone. A method of preparing a tibial aperture for is also disclosed.

Claims

1. A punch assembly for preparing a tibia bone for a prosthesis comprising:

a static component configured to be supported by the tibia bone; and

a dynamic component that includes a punch having a stem, the dynamic component supported for movement relative to the static component along a generally arcuate path to prepare an aperture having an arcuate contour in the tibia bone.

2. The punch assembly of claim 1, wherein the stem has an arcuate contour.

3. The punch assembly of claim 1, wherein the stem includes at least one fin.

4. The punch assembly of claim 1, wherein the stem includes a plurality of teeth.

5. The punch assembly of claim 1, wherein the static component includes a first support surface against which the dynamic component is supported for sliding movement along the generally arcuate path.

6. The punch assembly of claim 5, wherein the first support surface is an arcuate support surface that defines the generally arcuate path.

7. The punch assembly of claim 6, wherein the stem includes an arcuate support surface that corresponds in shape to the arcuate support surface of the static component, the arcuate support surface of the stem being supported for sliding movement against the arcuate support surface of the static member along the generally arcuate path.

8. The punch assembly of claim 6, wherein the static component includes a third surface that cooperates with the arcuate support surface to define a passage, wherein the punch moves at least partially through the passage along the generally arcuate path, wherein the second surface generally faces the arcuate support surface, and wherein the third surface is substantially parallel and disposed at a distance from an imaginary line that is substantially tangent to the arcuate support surface.

9. The punch assembly of claim 1, wherein the dynamic component is pivotally coupled to the static component.

10. The punch assembly of claim 9, wherein the dynamic component is adjustably coupled to the static component to enable positional adjustment of the generally arcuate path relative to the tibia bone.

11. The punch assembly of claim 10, further comprising a swing arm that pivotally couples the dynamic component and the static component, wherein the dynamic component is positionally adjustable along an axis of the swing arm.

12. The punch assembly of claim 10, further comprising a swing arm that pivotally couples the dynamic component and the static component, wherein the swing arm is pivotally coupled to the static component at a pivot point, and wherein the pivot point is positionally adjustable relative to the static component.

13. The punch assembly of claim 1, wherein the generally arcuate path extends toward a generally posterior, inferior direction into the tibia bone.

14. The punch assembly of claim 1, further comprising a first handle that is removably coupled to the static component, the first handle including a grip portion defining a first axis and a coupling portion defining a second axis, wherein the coupling portion is removably coupled to the static component, and wherein the first axis is offset from the second axis.

15. The punch assembly of claim 1, further comprising a second handle that removably couples to the dynamic component to extract the dynamic component from the tibia bone, wherein the static component is configured to be removably coupled to the tibia bone via a fastener, the second handle including a claw member that enables extraction of the fastener from the tibia bone.

16. The punch assembly of claim 1, wherein the dynamic component is configured to prepare the tibia bone for a knee joint prosthesis.

17. The punch assembly of claim 1, wherein the stem is generally cruciform in shape.

18. The punch assembly of claim 1, wherein the static component includes a bone engaging surface and a fastener that extends from the bone engaging surface and into the tibia bone, the fastener disposed at a positive acute angle relative to the bone engaging surface.

19. A method of preparing a tibia bone for a prosthesis comprising:

locating a static component of a punch assembly having a first support surface on the tibia bone; and

moving a dynamic component of the punch assembly having a stem with a second support surface relative to the static component such that the second support surface slides on the first support surface and such that the dynamic component of the punch assembly moves along a generally arcuate path into the tibia bone to prepare an aperture having an arcuate contour in the tibia bone.

20. The method of claim 19, further comprising removably coupling a first handle to the static component, and supporting the static component using the first handle while actuating the dynamic component.

21. The method of claim 19, further comprising removably coupling a second handle to the dynamic member, and extracting the dynamic member from the tibia bone using the second handle.

22. The method of claim 21, further comprising removably coupling the static member to the tibia bone via a fastener, and removing the fastener using the second handle.

23. The method of claim 19, wherein moving the dynamic component comprises moving the dynamic component in at least one of a generally anterior, inferior direction into the tibia bone and a generally posterior, inferior direction into the tibia bone.

24. The method of claim 19, further comprising sizing the tibia bone for a primary prosthetic prior to moving the dynamic component of the punch assembly along the generally arcuate path to prepare the aperture having the arcuate contour in the tibia bone.

25. The method of claim 19, further comprising surgically resecting the tibia bone to define a surgically resected surface on the tibia bone, and wherein locating the static component of the punch assembly comprises locating the static component of the punch assembly on the surgically resected surface.

26. A punch assembly for preparing a tibia bone for a knee joint prosthesis comprising:

a static component configured to be supported by the tibia bone, the static component defining a passage partially defined by a first arcuate support surface that defines a generally arcuate path, the passage further defined by a third support surface that is substantially parallel and disposed at a distance from an imaginary line that is substantially tangent to the first arcuate support surface; and

a dynamic component that includes a punch having a stem, the stem having a generally cruciform shape, an arcuate contour, a plurality of teeth, and a second arcuate support surface supported for sliding movement against the first arcuate support surface of the static component along the generally arcuate path to prepare an aperture having an arcuate contour in the tibia bone.