Orthopedic surgical device

• US 5,553,675 A
• Filed: 06/10/1994
• Issued: 09/10/1996
• Est. Priority Date: 06/10/1994
• Status: Expired due to Term

• Current Assignee: Linvatec Corporation (Jefferies Financial Group, Inc.)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Alexson, Charles E., Pitzen, James F., Smith, Jeffrey D.
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US08/258,338
• Time in Patent Office: 823 Days
• Field of Search: 173/216, 173/217, 227/67, 310/50
• US Class Current: 173/217
• CPC Class Codes: A61B 17/1628 Motors; Power supplies
• CPC Class Codes: A61B 17/1697 specially adapted for wire insertion
• CPC Class Codes: B25F 5/02 Construction of casings, bodies or handles B25F5/006, B25F5/008 take precedence
• CPC Class Codes: H02K 11/0094 Structural association with other electrical or electronic devices
• CPC Class Codes: H02K 11/215 Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 7/116 with gears
• CPC Class Codes: H02K 7/145 Hand-held machine tool

Abstract

A cordless drive assembly for driving various orthopedic surgical instruments is described. The drive assembly is battery powered and includes tracks in the handle portion of its housing for receiving the battery. A latch locks the battery to the housing.

Claims

1. A drive assembly for driving orthopedic surgical instruments, said drive assembly comprising:

a housing comprising elongate drive and handle portions defining drive and handle portion longitudinal axes, said handle portion projecting from said drive portion;

a drive comprising;

an electric direct current activated motor mounted within said drive portion, said motor having a motor shaft,

a transmission for transmitting power of the motor shaft to the surgical instrument, said transmission including a drive member,

said drive portion having surfaces defining a wire receiving chamber adapted to receive an orthopedic wire adapted to be driven during an orthopedic surgical procedure, at least a portion of said wire receiving chamber being situated within the motor shaft;

a trigger assembly movable relative to said handle portion;

electrical circuit means operatively associated with said trigger assembly for controlling the motor;

said handle portion comprising;

a releasably attachable battery comprising at least one cell, a battery housing, and a pair of battery contacts,

a battery receiving portion having battery terminals adapted to engage said battery contacts when said battery is attached to said battery receiving portion;

releasable attachment means for releasably attaching the battery to the battery receiving portion in a direction other than the direction of elongation of the handle portion,

biasing means for biasing said battery terminals toward a rest position, and

mounting means for mounting said battery terminals for deflection from said rest position.

2. A drive assembly according to claim 1 wherein the releasable attachment means comprises:

a) the handle portion having a pair of tracks defining flanges that are elongate in a direction substantially parallel to the longitudinal axis of said drive portion,

b) the battery having a pair of grooves adapted to receive the flanges of the tracks, and a pair of flexible, resilient cantilever members, and

c) said battery receiving portion having surfaces defining a cantilever member cavity for receiving the pair of flexible, resilient cantilever members in an interference fit so that the battery is frictionally held in place relative to the battery receiving portion.

3. A drive assembly according to claim 2 wherein the releasable attachment means comprises a releasable latch for releasably securing said battery to the battery receiving portion.

4. A drive assembly according to claim 1 wherein the releasable attachment means comprises means for releasably attaching the battery to the battery receiving portion in a direction substantially parallel to the axis of said drive portion.

5. A drive assembly according to claim 1 wherein each of said battery terminals comprise a substantially flat plate member having opposite side surfaces, and

each of said battery contacts comprise a pair of flexible, resilient arcuate members which are adapted to engage opposite side surfaces of a battery terminal when the battery is attached to the battery receiving portion.

6. A drive assembly according to claim 1 wherein said handle portion comprises a handgrip portion having outer surfaces that are sized and shaped to be grasped by a user without touching the battery, and inner surfaces defining a handgrip cavity, and

wherein said handgrip cavity is free of said transmission, said motor and any cells of said battery when said battery is received in said battery receiving portion.

7. A drive assembly for driving orthopedic surgical instruments, said drive assembly comprising:

a housing comprising elongate drive and handle portions defining drive and handle portion longitudinal axes, said handle portion projecting from said drive portion;

a drive comprising;

a motor having a motor shaft,

a transmission for transmitting the power of the motor shaft to the surgical instrument, said transmission including a drive member,

said drive portion having surfaces defining a wire receiving chamber adapted to receive an orthopedic wire adapted to be driven during an orthopedic surgical procedure;

a trigger assembly movable relative to said handle portion;

electrical circuit means operatively associated with said trigger assembly for controlling the motor;

said handle portion comprising;

a releasably attachable battery comprising at least one cell, a battery housing, and a pair of battery contacts,

a handgrip portion having a battery receiving portion with battery terminals adapted to engage said battery contacts when said battery is received in said battery receiving portion;

said handgrip portion having outer surfaces that are sized and shaped to be grasped by a user without touching the battery, and inner surfaces defining a handgrip cavity,

releasable attachment means for releasably attaching the battery to the battery receiving portion in a direction other than the direction of elongation of the handle portion,

wherein said handgrip cavity is free of said transmission, said motor and any cells of said battery when said battery is received in said battery receiving portion,

biasing means for biasing said battery terminals toward a rest position, and

mounting means for mounting said battery terminals for deflection from said rest position.

8. A device according to claim 7 wherein said handgrip portion has opposite top and bottom ends, and

said cells of said battery are spaced on an opposite end of said handgrip portion than said motor and transmission.

9. A drive assembly according to claim 7 wherein the releasable attachment means comprises:

a) the handgrip portion having a pair of tracks defining flanges that are elongate in a direction substantially parallel to the longitudinal axis of said drive portion, and

b) the battery having a pair of grooves adapted to receive the flanges of the tracks, and a pair of flexible, resilient cantilever members, and

c) said battery receiving portion having surfaces defining a cantilever member receiving cavity for receiving the pair of flexible, resilient cantilever members in an interference fit so that the battery is frictionally held in place relative to battery receiving portion.

10. A drive assembly according to claim 9 wherein the releasable attachment means comprises a releasable latch for releasably securing said battery to the battery receiving portion.

11. A drive assembly according to claim 7 wherein the releasable attachment means comprises means for releasably attaching the battery to the battery receiving portion in a direction substantially parallel to the axis of said drive portion.

12. A drive assembly according to claim 7 wherein each of said battery terminals comprise a substantially flat plate member having opposite side surfaces, and

each of said battery contacts comprise a pair of flexible, resilient arcuate members which are adapted to engage opposite side surfaces of a battery terminal when the battery is attached to the drive assembly.

13. A drive assembly for driving orthopedic surgical instruments, said drive assembly comprising:

a housing comprising elongate drive and handle portions defining drive and handle portion longitudinal axes, said handle portion projecting from said drive portion;

a drive comprising;

a motor having a motor shaft,

a transmission for transmitting the power of the motor shaft to the surgical instrument, said transmission including a drive member,

a trigger assembly movable relative to said handle portion;

electrical circuit means operatively associated with said trigger assembly for controlling the motor;

said handle portion comprising;

a releasably attachable battery comprising at least one cell, a battery housing, and a pair of battery contacts,

a battery receiving portion with battery terminals adapted to engage said battery contacts when said battery is received by said battery receiving portion; and

releasable attachment means for releasably attaching the battery to the battery receiving portion in a direction other than the direction of elongation of the handle portion,

said releasable attachment means comprising;

a) the battery portion having a pair of tracks defining flanges,

b) the battery having a pair of grooves adapted to receive the flanges of the tracks, and a pair of flexible, resilient cantilever members, and

c) said battery receiving portion having surfaces defining a cantilever member receiving cavity for receiving the pair of flexible, resilient cantilever members in an interference fit so that the battery is frictionally held in place relative to the battery receiving portion.

14. A drive assembly according to claim 13 wherein the releasable attachment means comprises a releasable latch for releasably securing said battery to the battery receiving portion.

15. A drive assembly according to claim 13 comprising biasing means for biasing said battery terminals toward a rest position, and

mounting means for mounting said battery terminals for deflection from said rest position.

16. A drive assembly according to claim 15 wherein each of said battery terminals comprise a substantially flat plate member having opposite side surfaces, and

each of said battery contacts comprise a pair of flexible, resilient arcuate members which are adapted to engage opposite side surfaces of a battery terminal.