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Method and apparatus for determining airway resistance and lung compliance

  • US 6,068,602 A
  • Filed: 09/26/1997
  • Issued: 05/30/2000
  • Est. Priority Date: 09/26/1997
  • Status: Expired due to Fees
First Claim
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1. A method of establishing the airway resistance and lung compliance of a subject using a non-linear circuit model, the subject inspiring and expiring breathing gases through an airway, said method comprising the steps of:

  • sensing breathing gas flow rate through the airway;

    sensing breathing gas pressure in the airway;

    calculating a gas volume moved through the airway from the sensed breathing gas flow rate;

    determining an invariant exponential based on physical characteristics of the airway; and

    calculating airway resistance and lung compliance based on the gas flow rate, the gas pressure, the gas volume, and the invariant exponential.

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