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Assisted ventilation to match patient respiratory need

  • US 6,532,957 B2
  • Filed: 09/23/1997
  • Issued: 03/18/2003
  • Est. Priority Date: 09/23/1996
  • Status: Expired due to Term
First Claim
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1. A method for calculating the phase in a patient'"'"'s respiratory cycle as a continuous variable comprising the steps of:

  • calculating a measure of instantaneous respiratory airflow, calculating a measure of the rate of change of said instantaneous respiratory airflow, calculating the degree of membership in each of a plurality of fuzzy magnitude and fuzzy rate of change sets from the calculated respiratory airflow and the calculated rate of change of respiratory airflow, using a plurality of fuzzy inference rules to calculate the degree of membership in each of a plurality of fuzzy phase sets from at least said fuzzy magnitude and fuzzy rate of change sets, and in a defuzzification step, calculating the instantaneous phase from the calculated degrees of membership in said plurality of fuzzy phase sets.

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