Firing member retraction devices for powered surgical instruments

  • US 9,700,310 B2
  • Filed: 08/23/2013
  • Issued: 07/11/2017
  • Est. Priority Date: 08/23/2013
  • Status: Active Grant
First Claim
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1. A surgical instrument, comprising:

  • a firing member assembly including a portion supported for selective axial movement in a distal direction and a proximal direction;

    a drive unit, comprising;

    a motor including a motor shaft; and

    a gear assembly drivingly coupled to the motor shaft and including an output shaft assembly configured to interface with the firing member assembly such that upon rotation of the motor shaft in a first rotary direction, the portion of the firing member assembly is axially driven in the distal direction and upon rotation of the motor shaft in a second rotary direction, the portion of the firing member assembly is axially driven in the proximal direction;

    a retraction assembly interfacing with the firing member assembly for manually applying other rotary motions to the firing member assembly in the second rotary direction when the motor is deactivated; and

    locking means interfacing with the retraction assembly and the drive unit for preventing transfer of the other rotary motions to the motor shaft during operation of the retraction assembly and while the gear assembly remains drivingly coupled to the motor shaft;

    wherein the surgical instrument further comprises a housing and wherein the motor includes a motor housing and wherein the gear assembly includes a gear box housing non-movably coupled to the motor housing, the motor housing and the gear box housing being supported within the housing for rotation relative thereto as a unit upon application of the other rotary motions to the firing member assembly.

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