Apparatus and method for making precise bone cuts in total knee replacement

• US 5,129,909 A
• Filed: 03/13/1991
• Issued: 07/14/1992
• Est. Priority Date: 03/13/1991
• Status: Expired due to Term

• Current Assignee: Sigma Associates LLC, Sigma Associates, Ltd.
• Original Assignee: Charles J. Sutherland
• Inventors: Sutherland, Charles J.
• Primary Examiner(s): Hafer, Robert A.
• Assistant Examiner(s): RIMELL, SAMUEL G
• Application Number:
  US07/668,887
• Time in Patent Office: 489 Days
• Field of Search: 606/53, 606/79, 606/82, 606/86, 606/87, 606/88, 606/96
• US Class Current: 606/88
• CPC Class Codes: A61B 17/155 Cutting femur

Abstract

Apparatus for making a precise cut in a bone comprising a cutting block having at least one saw-guiding slot therein. A screw is carried by the block and is adapted to secure the block to the bone so that the block is held in compression against the bone.

Claims

1. An apparatus for making precise cuts in a bone comprising:

a cutting block having a plurality of saw guiding slots and at least one hole extending threrethrough, and hole having a first portion and a second portion with the second portion having a cross sectional area less than that of the first portion so that a seat is formed in the cutting block and a lag screw disposed in said hole in said block and having a cylindrical threaded portion and a head portion, said head portion having a seat portion engaging the seat in the cutting block whereby as said lag screw is threaded into said bone cutting block is secured in a fixed position on said bone.

2. Apparatus as in claim 1 wherein at least certain of said saw guiding slots are inclined at an angle and extend through said hole above said seat so that they clear the head of the lag screw when it is disposed in said hole with its seat portion engaging said seat.

3. Apparatus as in claim 1 wherein said seat is inclined inwardly and downwardly and wherein said seat portion is provided with a downwardly angled peripheral surface.