Motor driven surgical fastener device with switching system configured to prevent firing initiation until activated

  • US 10,420,550 B2
  • Filed: 09/23/2016
  • Issued: 09/24/2019
  • Est. Priority Date: 02/06/2009
  • Status: Active Grant
First Claim
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1. A powered surgical stapler, comprising:

  • a housing, comprising;

    a battery; and

    a motor configured to output rotary motions when power from said battery is supplied to said motor;

    a switch configured to permit power to flow to said motor when in a closed state and prevent power flow to said motor when in an open state;

    a closure actuator configured to move between an unactuated position and an actuated position, wherein said closure actuator moves said switch into said closed state;

    a firing actuator configured to operate said motor when moved from an unactuated position to an actuated position to perform a firing stroke when said switch is in said closed state, wherein said firing actuator is resettable to perform another firing stroke;

    a counter element configured to count the number of firing strokes;

    an elongate shaft extending from said housing;

    an end effector extending from said elongate shaft, wherein said end effector is configurable in an unclamped configuration and a clamped configuration, and wherein said end effector is moved into said clamped configuration when said closure actuator is in said actuated position;

    a firing member configured to translate through said end effector between an unfired position and a fired position during a firing stroke in response to said output rotary motions, wherein said firing member is further configured to translate through said end effector between said fired position and said unfired position during a retraction stroke in response to said output rotary motions;

    a firing member position sensor;

    a display which displays the position of said firing member within said end effector during said firing stroke, the state of said switch, and said number of firing strokes;

    a pulse width modulation circuit in signal communication with said motor and said firing member position sensor; and

    a control circuit in signal communication with said pulse width modulation circuit, wherein said control circuit is configured to translate said firing member at a first speed during said firing stroke, and wherein said control circuit is configured to translate said firing member at a second speed during said retraction stroke.

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