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Apparatus and method for differentiating between tissue and mechanical obstruction in a surgical instrument

  • US 10,271,840 B2
  • Filed: 08/19/2014
  • Issued: 04/30/2019
  • Est. Priority Date: 09/18/2013
  • Status: Active Grant
First Claim
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1. A method for controlling a surgical instrument comprising:

  • monitoring a current draw of a motor coupled to a drive assembly for actuating a jaw assembly of the surgical instrument;

    calculating a plurality of rate of change values based on a plurality of samples of the current draw; and

    continuously determining whether the motor has reached a mechanical limit based on whether the plurality of rate of change values are within a first range and whether the current draw of the motor is stable based on the plurality of rate of change values being within a second range,wherein the first range corresponds to the motor reaching the mechanical limit and the second range corresponds to stable operation of the motor.

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