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Nasal volume meter

  • US 5,279,304 A
  • Filed: 04/30/1992
  • Issued: 01/18/1994
  • Est. Priority Date: 04/30/1992
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring nasal air flow comprising:

  • a head for interfacing with at least one of the nasal cavities of a patient in a sealed relationship such that essentially all of the air passing through the nasal passage flows through the head, said head having a measuring chamber through which air is inhaled and exhaled from the nasal cavity;

    a resistance wire disposed within the measuring chamber about which the air flows past;

    a current generator electrically connected to the resistance wire for providing a constant current through the resistance wire which heats the resistance wire;

    means for analyzing change in voltage across the resistance wire over time such that air flow through said measuring chamber is determined, said analyzing means in electrical communication with said resistance wire; and

    means for displaying said determined air flow, said displaying means in communication with said analyzing means.

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