Tibial resection guide

• US 8,162,949 B2
• Filed: 04/21/2008
• Issued: 04/24/2012
• Est. Priority Date: 04/21/2008
• Status: Active Grant

• Current Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Biomet Manufacturing, LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Duggineni, Rajesh V., Murray, David Wycliffe
• Primary Examiner(s): Snow, Bruce E
• Assistant Examiner(s): Hoban, Melissa
• Application Number:
  US12/106,773
• Publication Number:
  US 20090264890A1
• Time in Patent Office: 1,464 Days
• Field of Search: 606/88, 606/102
• US Class Current: 606/88
• CPC Class Codes: A61B 17/157 Cutting tibia

Abstract

A tibial resection guide. The tibial resection guide includes a support member having a longitudinal shaft, and a referencing guide coupled to the longitudinal shaft, the referencing guide defining a referencing slot. The tibial resection guide can also include a cutting guide coupled to the longitudinal shaft, the cutting guide defining a cutting slot, the cutting slot positioned at a fixed distance from the referencing slot, and an adjustment mechanism operable to move the referencing guide and the cutting guide along the longitudinal shaft without changing the fixed distance.

Claims

1. A tibial resection guide for a knee joint comprising:

a support member including a longitudinal shaft;

a femoral referencing guide rotatably mounted on the longitudinal shaft and configured for referencing a femur of the knee joint, the referencing guide including a referencing slot;

a femoral referencing member having a stylus arm attached to a bar, the stylus arm configured for referencing a posterior condyle of a femur of the knee joint and the bar removably passing through the referencing slot;

a cutting guide rotatably coupled to the longitudinal shaft, the cutting guide defining a cutting slot, the cutting slot positioned at a fixed distance from the referencing slot; and

an adjustment mechanism operable to move the referencing guide and the cutting guide along the longitudinal shaft without changing the fixed distance.

2. The tibial resection guide of claim 1, wherein the stylus arm is parallel and attached to the bar at an offset with an intermediate angled portion.

3. The tibial resection guide of claim 1, wherein the referencing guide and the referencing slot are rotatable relative to the cutting slot.

4. The tibial resection guide of claim 1, further comprising a base member supporting the cutting guide and having a bore and slidably mounted over the longitudinal shaft through the bore.

5. The tibial resection guide of claim 1, wherein the cutting guide includes first and second separable flanges, each of the first and second flanges independently rotatable about the longitudinal shaft between a first position in which the first and second flanges are aligned over one another and define the cutting slot therebetween and a second in which the first and second flanges are not aligned over one another.

6. The tibial resection guide of claim 4, wherein the adjustment mechanism includes a macro-adjustment mechanism movable between a first position preventing sliding of the base along the longitudinal shaft and a second position of allowing sliding of the base member along the longitudinal shaft.

7. The tibial resection guide of claim 6, wherein the macro-adjustment mechanism includes a push button, the push button spring-biased to the first position preventing movement along the longitudinal shaft.

8. The tibial resection guide of claim 6, further comprising a micro-adjustment mechanism that includes a nut threadably coupled to a threaded portion of the longitudinal shaft.

9. The tibial resection guide of claim 6, further comprising a micro-adjustment mechanism that includes a rotatable actuator having a curved groove defining a cam and a pin received in the curved groove configured for moving the base member along the longitudinal axis in smaller increments than the macroadjustment mechanism.

10. A tibial resection guide for a knee joint comprising:

a support member including a longitudinal shaft;

a femoral referencing guide rotatably mounted on the longitudinal shaft and configured for referencing a femur of the knee joint, the referencing guide including a referencing slot, the referencing guide independently rotatable about the longitudinal shaft;

a first guide portion having a first flange, the first guide portion coupled to the longitudinal shaft and independently rotatable about the longitudinal shaft;

a second guide portion having a second flange, the second guide portion coupled to the longitudinal shaft and independently rotatable about the longitudinal shaft, the first and second flanges rotatable between a first position of stacked alignment in which the first and second flanges are aligned over one another and define a cutting slot therebetween, and a second position in which the first and second flanges are out of stacked alignment, and wherein the first and second guide portions positioned under the referencing guide along the longitudinal shaft;

a base member movably supported on the longitudinal shaft and positioned under the first and second guide portions; and

an adjustment mechanism configured to move the referencing guide and the first and second guide portions along the longitudinal shaft by moving the base member along the longitudinal shaft.

11. A tibial resection guide of claim 10, wherein the longitudinal shaft passes through a bore of the base member, the bore keyed to the longitudinal shaft and preventing rotation of the base member relative to the longitudinal shaft.

12. The tibial resection guide of claim 11, wherein the referencing slot and the cutting slot define a fixed distance therebetween, the fixed distance remaining constant during the movement of the referencing guide and the first and second guide portions along the longitudinal shaft.

13. The tibial resection guide of claim 10, further comprising a separate referencing member, the referencing member manually insertable through the referencing slot for referencing posterior condyles of a femur of the knee joint.

14. The tibial resection guide of claim 10, wherein the adjustment mechanism includes a macro-adjustment mechanism and a micro-adjustment mechanism.

15. The tibial resection guide of claim 14, wherein the macro-adjustment mechanism includes a push button, the push button spring-biased to a position preventing sliding movement of the base member along the longitudinal shaft.

16. The tibial resection guide of claim 14, wherein the micro-adjustment mechanism includes a nut threadably coupled to a threaded portion of the longitudinal shaft.

17. The tibial resection guide of claim 14, wherein the micro-adjustment mechanism includes a rotatable actuator having a curved groove defining a cam and a pin received in the curved groove configured for moving the base member along the longitudinal axis in smaller increments than the macroadjustment mechanism.

18. A tibial resection guide for a knee joint comprising:

a support member including a longitudinal shaft;

a referencing guide mounted on the longitudinal shaft, the referencing guide integrally forming a stylus arm configured for engaging posterior femoral condyles of a femur of the knee joint;

a cutting guide coupled to the longitudinal shaft, the cutting guide positioned under the referencing guide and including first and second flanges independently rotatable relative to the longitudinal shaft between a first position of stacked alignment in which the first and second flanges are aligned over one another and define a cutting slot therebetween, and a second position in which the first and second flanges are out of stacked alignment, the first and second guide positioned are positioned under the referencing guide along the longitudinal axis, the cutting slot positioned at a fixed distance from the stylus arm;

a base member movably supported on the longitudinal shaft and positioned under the first and second flanges; and

an adjustment mechanism configured to move the referencing guide and the cutting guide along the longitudinal shaft without changing the fixed distance by moving the base member along the longitudinal shaft.

19. The tibial resection guide of claim 18, wherein the referencing guide is rotatable about the longitudinal shaft independently from the cutting guide.

20. The tibial resection guide of claim 18, wherein the adjustment mechanism includes a macro-adjustment mechanism movable between a first position preventing sliding of the base member along the longitudinal shaft and a second position of allowing sliding of the base member along the longitudinal shaft.