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Acoustic inhaler flow measurement

  • US 9,242,056 B2
  • Filed: 02/28/2007
  • Issued: 01/26/2016
  • Est. Priority Date: 03/07/2006
  • Status: Active Grant
First Claim
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1. An inhaler, comprising:

  • an external surface;

    a dispenser configured to dispense an aerosol or a dry powder at a dispensing position;

    a channel defining a flow path between the dispensing position and a gas outlet;

    a sensor detachably attached to the external surface, the sensor being adapted to sense vibrations or sound with a frequency in an interval of 100-3000 Hz;

    a processor adapted to estimate, on the basis of the vibrations/sound sensed in the interval of 100-3000 Hz, at least one parameter of a flow velocity of gas in the flow path; and

    a casing enclosing the sensor, wherein a front of the sensor is in direct contact with the external surface and a rear side of the sensor is in direct acoustic contact with surroundings of the inhaler via a port in the casing.

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