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Method to deliver medication

  • US 9,550,035 B2
  • Filed: 09/30/2015
  • Issued: 01/24/2017
  • Est. Priority Date: 09/25/2003
  • Status: Expired due to Term
First Claim
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1. A method to deliver medication comprising:

  • providing an acoustic volume sensor, the acoustic volume sensor including a variable-volume chamber, a reference volume, an enclosure, a printed circuit board, and a processor, the reference volume being defined by the printed circuit board within the enclosure, the printed circuit board including an acoustic source, a first microphone and a second microphone;

    the variable-volume and the reference volume forming at least part of an acoustic system;

    coupling a disposable drug cassette to the acoustic volume sensor, the disposable drug cassette including a drug reservoir and a valve, the valve in fluid communication with the drug reservoir;

    determining the volume of the variable-volume chamber in a first instance;

    controlling the valve to release an amount of drug;

    determining the volume of the variable-volume chamber in a second instance; and

    determining the amount of drug to output from the drug reservoir associated with a change in the volume of the variable-volume chamber.

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