Surgical apparatus

• US 5,911,723 A
• Filed: 05/28/1997
• Issued: 06/15/1999
• Est. Priority Date: 05/28/1996
• Status: Expired due to Term

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Howmedica International Incorporated (Stryker Corporation)
• Inventors: Ashby, Alan, Cowling, Mark A.
• Primary Examiner(s): Tucker, Guy V.
• Application Number:
  US08/864,168
• Time in Patent Office: 748 Days
• Field of Search: 606/90, 606/88, 606/89, 606/87, 606/86, 606/102
• US Class Current: 606/88
• CPC Class Codes: A61B 17/154 for preparing bone for knee prosthesis
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 2017/0268 for the knee

Abstract

A surgical tensioning apparatus has a base, first and second bone tissue engaging elements mounted on the base and being displaceable toward and away from each other. One of the tissue engaging elements being adapted to be oriented by the tissue engaged thereby. A guide element is provided which is adjustable in relation to the base and one of the tissue engaging elements for positioning first location element to locate a cutting guide provided with cooperating second location element onto the bone to be resectioned.

Claims

1. A knee tensioning appratus comprising:

a base, a first and second tissue engaging elements mounted on said base and being displaceable towards and away from each other, the first of said tissue engaging elements being adapted to be oriented by the tissue engaged thereby;

a guide element adjustable in relation to said base and a second of said tissue engaging elements for positioning a first location element to locate a cutting guide provided with a cooperating second location element on a bone to be resectioned;

said guide element being carried by said second tissue engaging element and arranged to move in relation to the base in accordance with movement of the second tissue engaging element;

said guide element is carried by a releasable rachet locking element movably located on the base and can be moved in only one direction by the second tissue engaging element;

said first tissue engaging element being located in a fixed relationship to the base and said second tissue engaging element comprising a movable head carrying a tissue engaging element provided with a tissue engaging surface and said guide element being moved by movement of said movable head;

said guide element engaging the movable head and is carried on a support movably mounted on the base; and

said second tissue engaging element being rotatable and having a lock for locking said second tissue engaging element in two or more angular positions.

2. The apparatus as claimed in claim 1 in which said guide element includes a guide bore.

3. The apparatus as claimed in claim 2 in which said guide bore is dimensioned to receive said first location element in the form of an elongated medullary guide to be inserted into a canal of said bone.

4. The apparatus as claimed in claim 3 in which said elongate guide is a drill, screw, or rod.

5. The apparatus as claimed in claim 3 in which a second location element is provided by a location opening in said cutting guide.

6. The apparatus as claimed in claim 5 in which said first location element is an opening in said bone formed by an elongate forming means guided through said guide bore.

7. The apparatus as claimed in claim 6 in which said second location element is provided by an abutment on said cutting guide which is dimensioned to locate in said opening in said bone.

8. The apparatus as claimed in claim 7 in which said cutting guide is provided with additional bores to receive attachment elements to further locate it on said bone.

9. The apparatus as claimed in claim 1 in which the tissue engaging elements each include a tissue engaging surface, each of said tissue engaging surfaces being arranged so that it faces away from the other.

10. The apparatus as claimed in claim 1 in which two guide elements are included and are arranged in spaced apart relationship in relation to one of said tissue engaging elements.

11. The apparatus as claimed in claim 1 in which the second tissue engaging element is adapted to be rotationally oriented by the tissue engaged thereby with respect to the long axis of said bone.

12. The apparatus as claimed in claim 1 in which said tissue engaging element is carried by a rotatable shaft mounted in said movable head.

13. The apparatus as claimed in claim 1 further including measuring means to measure the degree of rotary deflection of said second tissue engaging surface away from a position of parallelism with the first tissue engaging surface when first and second tissue engaging surfaces engage the tissue.

14. The apparatus as claimed in claim 13 further including a drive mechanism to displace the tissue engaging elements away from each other and which mechanism includes a geared drive.

15. The apparatus as claimed in claim 14 in which said geared drive mechanism includes a rack and pinion assembly.