Portable power cutting tool

• US 5,490,860 A
• Filed: 12/08/1993
• Issued: 02/13/1996
• Est. Priority Date: 12/08/1993
• Status: Expired due to Term

• Current Assignee: Sofamor Danek Properties, Inc. (Medtronic Plc)
• Original Assignee: Sofamor Danek Properties, Inc. (Medtronic Plc)
• Inventors: Evans, Edward A., Purdy, Craig, Middle, George H.
• Primary Examiner(s): Pellegrino, Stephen C.
• Assistant Examiner(s): MULCARE, NANCY C
• Application Number:
  US08/163,999
• Time in Patent Office: 797 Days
• Field of Search: 606/80, 606/159, 606/167, 606/170, 606/171, 606/180, 604/22
• US Class Current: 606/171
• CPC Class Codes: A61B 17/32002 with continuously rotating, oscillating or reciprocating cutting instruments
• CPC Class Codes: A61B 2017/0023 disposable
• CPC Class Codes: A61B 2017/00734 battery operated

Abstract

A portable power cutting tool is disclosed, having a plurality of replaceable tool assemblies for connection to the power cutting tool, with each tool assembly having a different cutting blade and a mode of motion selected for optimum operation of the cutting blade. Each tool assembly has a mode of motion selected from the group of rotation, reciprocation, and a combination of rotation and reciprocation. The tool assemblies can be disposable.

Claims

1. A system for performing cutting operations during surgery, comprising:

a housing;

a motor mounted within said housing, said motor having a rotating output shaft; and

a plurality of surgical implement assemblies, each of which includes a different surgical implement and a transmission mechanism designed to impart a characteristic mode of motion to said surgical implement, a first said assembly producing rotary motion, a second said assembly producing reciprocating motion, and a third said assembly producing a combination of rotary and reciprocating motion;

wherein each of said surgical implement assemblies is selectively attachable one-at-a-time by a user to said motor output shaft to perform a different desired cutting operation using said different surgical implement and said mode of motion which is characteristic to said selected assembly.

2. A system for performing cutting operations during surgery, comprising:

a housing;

a motor mounted within said housing, said motor having a rotating output shaft;

a cam follower attached to said housing;

a plurality of transmission mechanisms, each said mechanism having an output drive shaft, each said mechanism being designed to impart a different mode of motion to its respective drive shaft, and each said mechanism being selectively attachable one-at-a-time by a user to said motor output shaft to product a selected one of said different modes of motion; and

a surgical implement attached to each said drive shaft;

wherein said different modes of motion include rotation, reciprocation, and a combination of rotation and reciprocation.

3. A system as claimed in claim 2, wherein a first said transmission mechanism comprises:

a first transmission body attachable to said housing;

a first drive piston attachable to said motor output shaft for rotation by said motor output shaft;

a cam groove on said first drive piston engaging with said cam follower to cause said first drive piston to reciprocate as said first drive piston rotates; and

a drive shaft attached to said first drive piston for rotation and reciprocation by said first drive piston.

4. A system as claimed in claim 3, wherein a second said transmission mechanism comprises:

a second transmission body attachable to said housing;

a second drive piston attachable to said motor output shaft for rotation by said motor output shaft;

a cam groove on said second drive piston engaging with said cam follower to cause said second drive piston to reciprocate relative to said housing as said second drive piston rotates;

a second drive shaft attached to said second drive piston for reciprocation by said second drive piston;

a rotation limiter piston fixedly attached to said second drive shaft;

wherein said second drive piston is free to rotate relative to said second drive shaft; and

wherein said rotation limiter piston is constrained by said second transmission body to prevent rotation of said second drive shaft relative to said housing.

5. A system as claimed in claim 4, wherein a third said transmission mechanism comprises;

a third transmission body attachable to said housing;

a drive bushing attachable to said motor output shaft for rotation by said motor output shaft;

a third drive shaft fixedly attached to said drive bushing for rotation by said drive bushing; and

a reciprocation limiter bushing fixedly attached to said third drive shaft;

wherein said reciprocation limiter bushing is constrained by said third transmission body to prevent reciprocation of said third drive shaft relative to said housing.