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Powered surgical device with speed and current derivative motor shut off

  • US 10,390,858 B2
  • Filed: 04/05/2018
  • Issued: 08/27/2019
  • Est. Priority Date: 05/02/2017
  • Status: Active Grant
First Claim
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1. A surgical instrument, comprising:

  • an end effector;

    a power source;

    a motor coupled to the power source, the motor configured to actuate the end effector;

    a motor control circuit configured to measure a current draw of the motor and an angular velocity of the motor; and

    a controller operatively coupled to the motor and configured to;

    control the motor based on a current draw of the motor and an angular velocity of the motor;

    calculate an instantaneous rate of change of each of the current draw of the motor and the angular velocity of the motor; and

    determine that the motor reached a mechanical limit based on the instantaneous rate of change of the current draw of the motor exceeding a first threshold and the instantaneous rate of change of the angular velocity of the motor exceeding a second threshold.

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