United States Patent  [ii] Patent Number: 4,768,504
Ender  Date of Patent: Sep. 6, 1988
 References Cited
U.S. PATENT DOCUMENTS
2,294,303 8/1942 Jagow 128/92 VD
4,273,117 6/1981 Neuhauser 128/310 X
4,284,080 8/1981 Rehder 128/305
4,509,511 4/1985 Neufeld .
FOREIGN PATENT DOCUMENTS
2304322 10/1976 France .
Primary Examiner—Michael H. Thaler
Attorney, Agent, or Firm—Holman & Stern
A device for performing an osteotomy comprises an arcuately shaped saw blade (14), which in particular has a cross-sectional configuration in the shape of an arc of a circle, non-rotatably connected via a carrier body (12) with a spacer member (9) driven by an oscillating drive device (6) so that the saw blade (14) performs a reciprocating circular movement. A retractable guide bushing (21) is loaded by a spring (22) and slidably supported within the spacer member (9) so that it is resiliently urged in the feed direction (27) of the saw blade (14), the guide bushing (21) having a guide passage (26) accommodating a guide pin, for example a boring wire, anchored within the bone.
11 Claims, 3 Drawing Sheets