Hockey stick chisel

• US 5,135,528 A
• Filed: 06/04/1991
• Issued: 08/04/1992
• Est. Priority Date: 06/04/1991
• Status: Expired due to Fees

• Current Assignee: Frederick Winston
• Original Assignee: Frederick Winston
• Inventors: Winston, Frederick
• Primary Examiner(s): Brown, Michael A.
• Application Number:
  US07/710,326
• Time in Patent Office: 427 Days
• Field of Search: 606/79, 606/84, 606/85, 606/184, 606/185, 606/186, 30/314, 30/167, 30/167.1, 30/DIG. 8
• US Class Current: 606/79
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1671 for the spine

Abstract

A medical instrument for performing a vertebral osteotomy comprising an elongated handle member having first and second ends and a curved blade member extending from the second end of the handle, which curved blade member terminates in a chisel at a forward edge. The forward tip of the chisel is chamfered so as to safeguard against contacting the spinal cord during the vertebral osteotomy.

Claims

1. A medical instrument for performing a vertebral osteotomy comprising:

an elongated handle member having first and second ends, and

a planar curved blade member extending from said second end of said handle and adapted to be inserted between adjacent vertebrae, said curved blade member terminating in a chisel at a forward edge thereof, said chisel having a chamfered non-cutting edge extending generally from said forward edge to an inner side of said chisel.

2. The medical instrument of claim 1 wherein said curved blade member tapers gradually to said chisel.

3. The medical instrument of claim 2 wherein said curved blade member has a radius of curvature of about 0.31 inches.

4. The medical instrument of claim 2 wherein said curved blade member has a radius of curvature ranging from about 0.2 inches to about 0.5 inches.

5. The medical instrument of claim 4 wherein said curved blade member has a width dimension ranging from about 0.2 inches to about 0.5 inches.

6. The medical instrument of claim 5 wherein said curved blade member is oriented with respect to said handle member at an angle ranging between about 30°

and about 70°

.

7. The medical instrument of claim 6 wherein a forward tip of said chisel extends from said blade member in an amount ranging from about 0.2 inches to about 0.4 inches.

8. The medical instrument of claim 5 wherein said curved blade member is oriented with respect to said handle member at an angle of about 45°

.

9. The medical instrument of claim 6 wherein a forward tip of said chisel extends from said blade member by about 0.31 inches.

10. The medical instrument of claim 4 wherein said curved blade member has a width dimension of about 0.31 inches.