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Output displacement control using phase margin in an ultrasonic surgical hand piece

  • US 6,678,621 B2
  • Filed: 04/06/2001
  • Issued: 01/13/2004
  • Est. Priority Date: 10/20/2000
  • Status: Active Grant
First Claim
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1. A method for operating an ultrasonic surgical hand piece comprising the steps of:

  • measuring a resonant frequency of the hand piece;

    measuring an anti-resonant frequency of the hand piece;

    calculating a phase margin which is the difference of the resonant frequency and the anti-resonant frequency;

    correlating the phase margin with an output displacement;

    calculating a drive current based on the correlation of the phase margin with the output displacement; and

    driving the hand piece with the drive current.

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