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Occlusion detection using pulse-width modulation and medical device incorporating same

  • US 8,603,027 B2
  • Filed: 03/20/2012
  • Issued: 12/10/2013
  • Est. Priority Date: 03/20/2012
  • Status: Active Grant
First Claim
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1. An infusion device, comprising:

  • a motor having a rotor;

    a stopper mechanically coupled to the rotor, the stopper being displaced to deliver fluid via a fluid path in response to rotation of the rotor;

    a modulation module coupled to the motor, the modulation module generating a modulated voltage applied to the motor, the modulated voltage oscillating between a first voltage and a second voltage, the modulated voltage being equal to the first voltage for a percentage of a time interval, the percentage corresponding to a duty cycle; and

    a control module coupled to the modulation module to adjust the duty cycle to achieve a commanded rotation of the rotor and detect an occlusion condition in the fluid path based on the duty cycle.

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