POWER-DRIVEN RECIPROCATING BONE SURGERY INSTRUMENT

• US 3,640,280 A
• Filed: 11/26/1969
• Issued: 02/08/1972
• Est. Priority Date: 11/26/1969
• Status: Expired due to Term

• Current Assignee: Daniel R. Slanker, Edwin E. Slanker
• Original Assignee: Daniel R. Slanker, Edwin E. Slanker
• Inventors: Slanker, Daniel R., Slanker, Edwin E.
• Primary Examiner(s): Juhasz, Andrew R.
• Assistant Examiner(s): Koczo, Jr., Michael
• Application Number:
  US04/880,094
• Time in Patent Office: 804 Days
• Field of Search: 30/166 128/317 145/31R,31B,31C,31D 32/46,47
• US Class Current: 606/84
• CPC Class Codes: A61B 17/144 with cutting edges at the side of the saw blades
• CPC Class Codes: A61B 2017/00544 pneumatically
• CPC Class Codes: B23D 51/18 actuated by fluid or gas pressure B23D51/20 takes precedence
• CPC Class Codes: B23Q 11/10 Arrangements for cooling or lubricating tools or work incorporated in tools, see the relevant subclass for the tool , e.g. B23B27/10, B23B51/06, B23C5/28, B23D77/006; for circular saw blades B23D59/02, for cooling grinding surfaces B24B55/02
• CPC Class Codes: B23Q 5/033 driven essentially by fluid pressure
• CPC Class Codes: Y10T 137/2229 Device including passages having V over T configuration

Abstract

A bone surgery tool is provided with a reciprocating drive means. The tool and a flexible drive band can be enclosed in a shroud to protect tissue against contact with the tool or the driving means. The shroud can also contain a channel for a flushing fluid. The power unit can utilize a double-acting fluid piston, with the reversal in the direction of movement of the piston being effected by a fluidic control device.

Claims

1. A reciprocally power-driven cutting instrument comprising a handle, an elongated shroud attached to the forward end of said handle, said shroud having an internal guideway extending along at least a portion of the length of said shroud and having a tool opening extending from at least a portion of said guideway to the exterior of said shroud, a cutting tool positioned in said tool opening, said cutting tool having retention means extending into said guideway to couple said tool to said shroud while permitting said tool to freely move along said guideway, and power means connected to said tool to effect reciprocation of said tool within said tool opening along the path of at least a portion of said guideway;

said power means comprising a shaft mounted in said handle in alignment with the rear end of said shroud, means for reciprocally driving said shaft, and a flexible band positioned in said guideway, the rear end of said flexible band being connected to the front end of said shaft, the front end of said flexible band being connected to said cutting tool.

2. An instrument in accordance with claim 1 further comprising friction reducing means mounted in said shroud in contact with the inner surface of said tool.

3. An instrument in accordance with claim 1 wherein said guideway is curved in a plane perpendicular to the width of said flexible band.

4. An instrument in accordance with claim 1 wherein said shroud comprises a shank section and an elongated tool section, said guideway and said tool opening extending rearwardly through said shank section to permit the insertion of said tool and said flexible band into said shroud from the rear end of said shank section, and further comprising means for securing said shank section to said handle.

5. An instrument in accordance with claim 1 wherein said means for reciprocally driving said shaft comprises at least one power chamber and at least one control chamber formed in said handle;

said shaft extending through said at least one power chamber and at least one control chamber;

at least one piston flange mounted on said shaft in each said at least one power chamber and dividing each said at least one power chamber into a front section and a rear section;

at least one piston flange mounted on said shaft in each said at least one control chamber and dividing each said at least one central chamber into a front section and a rear section;

a fluidic amplifier having a power input, first and second control inputs and first and second power outputs;

means for supplying a fluid under pressure to said power input;

means providing fluid communication between the rear section of each said at least one control chamber and said first control input;

means providing fluid communication between the front section of each said at least one control chamber and said second control input;

means providing fluid communication between said first power output and the rear section of each said at least one power chamber; and

means providing fluid communication between said second power output and the front section of each said at least one power chamber, so that the movement of the piston in each said at least one control chamber varies the relative magnitude of the pressure signals applied to said first and second control inputs to effect a swiTching of the flow of fluid entering said power input to said first power output at the end of the rearward motion of said shaft and to said second power output at the end of the forward motion of said shaft.

6. An instrument in accordance with claim 1 wherein said shroud is provided with a fluid passageway extending to a point in the forward tip of said shroud, and further comprising means for supplying a flushing fluid to said fluid passageway, and wherein said cutting tool is a bone surgery abrading tool.

7. An instrument in accordance with claim 6 wherein said guideway is curved in a plane perpendicular to the width of said flexible band.

8. An instrument in accordance with claim 1 wherein said shroud is formed of material of sufficient flexibility to permit adjustment of the longitudinal curvature of said shroud.

9. An instrument in accordance with claim 1 wherein said means for reciprocally driving said shaft comprises a double acting fluid piston and a fluidic control device connected to effect periodic reversals in the direction of movement of said piston.