Sizing plate and drill guide assembly for orthopaedic knee instrumentation

• US 5,634,927 A
• Filed: 07/06/1995
• Issued: 06/03/1997
• Est. Priority Date: 07/06/1995
• Status: Expired due to Term

• Current Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Zawadzki, Steven A., Houston, Michelle L.
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): Woo, Julian W.
• Application Number:
  US08/499,049
• Time in Patent Office: 698 Days
• Field of Search: 606/88, 606/89, 606/96, 606/87, 606/79, 606/80
• US Class Current: 606/96
• CPC Class Codes: A61B 17/1735 for rasps or chisels
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61F 2/389 Tibial components A61F2/3868 takes precedence
• CPC Class Codes: A61F 2/4684 Trial or dummy prostheses

Abstract

The invention is directed to an orthopaedic instrumentation assembly 10 for at least partially preparing an end of a bone with a drill for receiving a prosthesis. The instrumentation assembly includes a drill guide 14 having a drill guide opening for guiding a drill into the bone; and an orthopaedic sizing plate 12 attachable to the end of the bone. The sizing plate 12 is configured for interconnecting with the drill guide 14. The drill guide 14 includes a first drill stop 47 and the sizing plate includes a second drill stop 33, with the first drill stop and the second drill stop coacting with each other for limiting projection and for maintaining axial alignment of the drill into the bone.

Claims

1. An orthopaedic instrumentation assembly for at least partially preparing an end of a bone with a drill for receiving a prosthesis, said instrumentation assembly comprising:

a drill guide including a drill guide opening for guiding a drill into the bone; and

an orthopaedic plate member attachable to the end of the bone, said plate member including means for interconnecting with said drill guide;

wherein said drill guide includes a first drill stop means and said orthopaedic plate member includes a second drill stop means, said first drill stop means and said second drill stop means coacting with each other for limiting projection and for maintaining axial alignment of the drill into the bone, and wherein said first drill stop means comprises a first shoulder on said drill guide, and said second drill stop means comprises a second shoulder on said plate member, and wherein said plate member includes a drill opening associated with said drill guide opening, and wherein said first shoulder is disposed at an inner periphery of said drill guide opening, and said second shoulder is disposed at an inner periphery of said drill opening, and wherein said drill opening of said plate member includes an interconnecting opening extending therefrom, such that the second shoulder on the inner periphery of the drill opening of said plate member forms only a partial circumferential shoulder, and wherein the first shoulder on the inner periphery of said drill guide opening of said drill guide provides a supplemental stop which complements the partial circumferential shoulder of the drill opening on said plate member, said first shoulder of said drill guide being positioned within the interconnecting opening of said plate member.

2. The orthopaedic instrumentation assembly of claim 1, wherein said interconnecting opening on said plate member defines an opening for receiving a fin cutting member of a broach when said drill guide is not interconnected with said plate member.

3. The orthopaedic instrumentation assembly of claim 1, wherein said orthopaedic plate member comprises a tibial sizing plate.

4. The orthopaedic instrumentation assembly of claim 1, wherein said drill guide includes a pair of locating holes, and wherein said interconnecting means comprises a pair of locating pins connected to said plate member and respectively received within said locating holes.

5. An orthopaedic instrumentation assembly for at least partially preparing a proximal end of a tibia for receiving a prosthesis, said instrumentation assembly comprising:

a drill guide including at least one peg drill guide opening for guiding a peg drill; and

a tibial sizing plate attachable to the proximal end of the tibia and including means for interconnecting with said drill guide, said sizing plate having at least one peg opening, each said peg opening associated with a respective said peg drill guide opening, said sizing plate including a first drill stop means, and said drill guide including a supplemental drill stop for coacting with the first drill stop means for limiting projection and for maintaining axial alignment of the peg drill into the tibia, and wherein said drill stop means comprises a shoulder on said sizing plate and said shoulder is disposed at an inner periphery of said peg opening, and wherein said supplemental drill stop comprises a supplemental shoulder on said drill guide and said supplemental shoulder is disposed on an inner periphery of a drill guide opening on said drill guide, and wherein said peg opening of said sizing plate includes an interconnecting opening extending therefrom, such that the sizing plate shoulder on the inner periphery of the peg opening forms only a partial circumferential shoulder, and wherein the supplemental shoulder on the inner periphery of said drill guide opening of said drill guide provides a supplemental stop which complements the partial circumferential shoulder of the peg opening on said sizing plate, said supplemental shoulder of said drill guide being positioned with the interconnecting opening of said sizing plate.

6. The orthopaedic instrumentation assembly of claim 5, wherein said drill guide includes a pair of locating holes, and wherein said interconnecting means comprises a pair of locating pins connected to said tibial sizing plate and respectively received within said locating holes.