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Metering system and method for aerosol delivery

  • US 8,511,299 B2
  • Filed: 10/04/2010
  • Issued: 08/20/2013
  • Est. Priority Date: 09/25/2003
  • Status: Expired due to Term
First Claim
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1. An apparatus for determining the volume of a fluid, the apparatus comprising:

  • a housing configured to be in communication with a valve;

    a printed circuit board disposed within the housing wherein the printed circuit board defines a first volume and a second volume including a gas region and a fluid region, the printed circuit board comprising;

    an acoustic source;

    a first microphone disposed within the first volume; and

    a second microphone disposed within the second volume; and

    a processor configured to calculate a change in volume of the gas region wherein the processor determines an amount of fluid output from the fluid region,wherein the fluid is an aerosolized fluid.

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