SURGICAL INSTRUMENT FOR PLACEMENT OF BONE PINS AND HOLES THEREFOR

• US 3,719,186 A
• Filed: 04/22/1971
• Issued: 03/06/1973
• Est. Priority Date: 04/22/1971
• Status: Expired due to Term

• Current Assignee: UAB Research Foundation The Non-Profit Corporation
• Original Assignee: James J. Jr. Merig
• Inventors: Merig, James J. Jr.
• Primary Examiner(s): Pace, Channing L.
• Application Number:
  US05/136,345
• Time in Patent Office: 684 Days
• Field of Search: 128/305,310,347,348,349R,35R,83,92EB
• US Class Current: 606/80
• CPC Class Codes: A61B 17/1739 specially adapted for particular parts of the body
• CPC Class Codes: A61B 2017/1651 for cooling
• CPC Class Codes: A61B 2090/08021 of the patient or his organs
• CPC Class Codes: A61B 2217/005 with suction drainage system
• CPC Class Codes: A61B 2217/007 with irrigation system
• CPC Class Codes: Y10S 606/916 Tool for installing or removing orthopedic fastener

Abstract

A surgical instrument for placement of bone pins and holes therefor having an outer cannula telescopically receiving an inner cannula which in turn telescopically receives a stylus. The outer cannula has symmetrically separable components and one end thereof engages a bone in which a hole is drilled. A tool is detachably connected to the outer cannula for retaining the outer cannula assembly. An inner cannula terminates inwardly of said one end of the outer cannula and a stylus extends to a point adjacent said one end of the outer cannula.

Claims

1. A surgical instrument for use in the placement of bone pins and drilled holes therefor;

a. an outer cannula having separable components with one end of said outer cannulA being adapted to be maintained in engagement with a bone in which a hole is to be drilled, b. a tool engagable with said separable components of said outer cannula holding said components together in assembled position while said tool is in one position relative to said components and releasing said components upon movement of said tool to another position, c. an inner cannula telescoping into said outer cannula with one end of said inner cannula terminating inwardly of said one end of said outer cannula, and d. a stylus telescoping into said inner cannula and extending to a point adjacent said one end of said outer cannula restraining the entrapment of soft tissue in said outer cannula.

2. A surgical instrument as defined in claim 1 in which said one end of said outer cannula is serrated.

3. A surgical instrument as defined in claim 1 in which the end of said stylus adjacent said one end of said outer cannula is tapered.

4. A surgical instrument as defined in claim 1 in which the end of said outer cannula opposite said one end is enlarged and said inner cannula has an enlarged end portion fitting said one enlarged end of said outer cannula.

5. A surgical instrument as defined in claim 4 in which said enlarged end portions of said outer and inner cannulae are concentric, cylindrical members which communicate with reduced diameter, concentric, cylindrical portions, respectively, of said cannulae.

6. A surgical instrument as defined in claim 5 in which said stylus is provided with an outer surface which corresponds to and slidably engages a portion of the inner surface of said inner cannula.

7. A surgical instrument as defined in claim 6 in which said enlarged end portion of said inner cannula extends axially outwardly of said outer cannula and the adjacent end of said stylus extends axially outwardly of said inner cannula.

8. A surgical instrument as defined in claim 1 in which said outer cannula is divided longitudinally into separate, matching sections with outwardly opening locking grooves in said sections and said tool is provided with contact surfaces along the edges of an outwardly opening recess therein which engage said locking grooves with a sliding fit to retain said sections in assembled position.

9. A surgical instrument as defined in claim 8 in which each locking groove is provided with an inner surface which flares outwardly toward said one end of said outer cannula and said contact surfaces on said tool correspond to and slidably engage the adjacent inner surfaces of said locking groove.