Surgical instrument with wireless communication between control unit and remote sensor

  • US 11,000,277 B2
  • Filed: 09/09/2015
  • Issued: 05/11/2021
  • Est. Priority Date: 01/10/2007
  • Status: Active Grant
First Claim
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1. A cordless surgical instrument for cutting and stapling tissue, comprising:

  • a handle;

    a battery in the handle; and

    a firing system, comprising;

    a shaft extending from the handle;

    a motor in the handle, the motor comprising an output connected to the shaft, wherein the battery powers the motor;

    an end effector connected to the shaft, wherein the end effector comprises a proximal end, a distal end, and a working portion, wherein the proximal end is closer to the handle than the distal end, and wherein upon actuation of the firing system the working portion traverses the end effector from the proximal end toward the distal end;

    a control circuit in the handle for controlling current through the motor from the battery; and

    a digital rotary encoder in the handle that outputs digital signals to the control circuit related to rotation of the shaft,wherein the control circuit comprises a relay connected to the motor, wherein the control circuit is configured to;

    determine a position of the working portion in the end effector based on the digital signals from the digital rotary encoder;

    compare a level of the motor current to a threshold motor current level; and

    change the current supplied to the motor by changing a state of the relay when both the working portion is within a specified position range in the end effector and the motor current level exceeds a threshold motor current level for the specified position range.

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