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Ultrasonic device for cutting and coagulating with stepped output

  • US 8,704,425 B2
  • Filed: 08/13/2012
  • Issued: 04/22/2014
  • Est. Priority Date: 08/06/2008
  • Status: Active Grant
First Claim
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1. A method of determining a change in tissue state in an ultrasonic surgical instrument, the method comprising:

  • sampling, by a processor, one or more drive signals of a generator for driving an ultrasonic transducer;

    calculating, by the processor, a first weighted moving average of at least one of the sampled drive signals;

    calculating, by the processor, a slope of the calculated first moving average of at least one of the sampled drive signals;

    calculating, by the processor, a second weighted moving average for the slope of the sampled drive signal;

    calculating, by the processor, a moving average for the slope;

    comparing, by the processor, the second weighted moving average for the slope and the moving average for the slope; and

    determining, by the processor, the occurrence of a change in tissue state based on the comparison.

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