Bone shaping instrument and method for using the same

• US 20060122616A1
• Filed: 12/07/2004
• Published: 06/08/2006
• Est. Priority Date: 12/07/2004
• Status: Active Grant

• Current Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Products Incorporated (Johnson & Johnson)
• Inventors: Bennett, Travis, Wyss, Joseph G.
• Granted Patent: US 7,766,913 B2
• Time in Patent Office: Days
• US Class Current: 606/87
• CPC Class Codes: A61B 17/154 for preparing bone for knee prosthesis
• CPC Class Codes: A61B 17/1764 for the knee

Abstract

A bone resection tool for resecting an end of a bone along a surface having a curvature comprises a guide, a cutting tool and a track follower. The guide is configured to be removably attached in a fixed position to the end of the bone. The guide is configured to include a track exhibiting a curvature generally corresponding to the curvature of the surface to be resected in the bone. The cutting tool includes a cutting face. The track follower is configured to couple to the cutting tool and cooperate with the track to facilitate reciprocation of the cutting tool relative to the guide to induce the cutting face to resect the bone along the surface having the curvature. A method for cutting a bone along a curved surface conforming to the curvature of a curved surface of the underside of a prosthetic component comprises the steps of incising the tissue surrounding the surface of the bone, positioning a guide alongside the surface of a bone to be cut, affixing the guide to the bone, interconnecting a cutter having a cutting face with the guide, maintaining the cutting face generally parallel to the tangent of the curved surface and traversing the cutting face along the bone while guiding the cutter along the track. The tissue incision incises the tissue surrounding the surface of the bone to be cut in a minimally invasive fashion. The positioned guide includes a track configured to assimilate the curvature of the curved surface of the underside of the prosthetic component.

Claims

1. A bone resection tool for resecting an end of a bone along a surface having a curvature, the bone resection tool comprising:

a guide configured to be removably attached in a fixed position to the end of the bone, the guide being configured to include a track exhibiting a curvature generally corresponding to the curvature of the of the surface to be resected in the bone;

a cutting tool including a cutting face;

a track follower configured to couple to the cutting tool and cooperating with the track to facilitate reciprocation of the cutting tool relative to the guide to induce the cutting face to resect the bone along the surface having the curvature.

2. The device of claim 1 and further comprising a shaft coupled to the cutting tool and configured to cooperate with the cutting tool to induce the cutting face to resect the bone.

3. The device of claim 2 wherein the shaft, cutter, track follower and guide cooperate to maintain the shaft generally perpendicular to the surface having a curvature.

4. The device of claim 3 comprising a driver coupled to the shaft to rotate the same about the longitudinal axis of the shaft.

5. The device of claim 4 wherein the shaft is rigidly attached to the cutting face.

6. The device of claim 5 wherein the track follower and track are configured to facilitate reciprocal movement of the cutter relative to the guide along the track.

7. The device of claim 6 wherein the cutting face is configured to cut on the end of the face and a side of the face.

8. The device of claim 5 wherein the guide comprises spaced apart rail extending along and above the surface of curvature wherein the rails cooperate to define the track.

9. The device of claim 8 wherein a curved slot is formed through each rail and the slots cooperate to define the track.

10. The device of claim 8 wherein a portion of the shaft is disposed between the spaced apart rails.

11. The device of claim 9 wherein a portion of the shaft is disposed between the spaced apart rails.

12. The device of claim 11 wherein the shaft is configured to reciprocate along its longitudinal axis perpendicular to the tangent of the curved slot.

13. The device of claim 12 wherein a stop is formed on the shaft which cooperates with the track follower to limit the reciprocal movement of the shaft toward the bone.

14. The device of claim 13 wherein the stop is configured to be adjusted longitudinally with respect to the shaft.

15. A method for cutting a bone along a curved surface conforming to the curvature of a curved surface of the underside of a prosthetic component, the method comprising the steps of:

incising the tissue surrounding the surface of the bone to be cut in a minimally invasive fashion;

positioning a guide alongside the surface of a bone to be cut, the guide including a track configured to assimilate the curvature of the curved surface of the underside of the prosthetic component;

affixing the guide to the bone;

interconnecting a cutter having a cutting face with the guide;

maintaining the cutting face generally parallel to the tangent of the curved surface; and

traversing the cutting face along the bone while guiding the cutter along the track.

16. The method of claim 15 wherein the cutter includes a shaft extending perpendicularly relative to the cutting face and further comprising traversing the cutter along the bone while maintaining the shaft normal to the tangent of the curved surface.

17. The method of claim 16 and further comprising moving the shaft longitudinally along an axis perpendicular to the tangent of the curved surface to advance the cutting face into the bone.

18. The method of claim 17 and further comprising rotating the shaft about the axis.

19. The method of claim 18 further comprising the step of manipulating the cutter to continuously traverse the track.