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Pressure support ventilatory assist system

  • US 5,598,838 A
  • Filed: 04/07/1995
  • Issued: 02/04/1997
  • Est. Priority Date: 04/07/1995
  • Status: Expired due to Term
First Claim
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1. A pressure support ventilatory assist device comprising:

  • a blower;

    a patient mask;

    a conduit for placing said blower in fluid communication with said patient mask;

    a valve disposed in-line of said conduit between said blower and said patient mask;

    a flow sensor disposed between said blower and said valve for measuring airflow within said conduit between said blower and said valve, said measured airflow corresponding to air inspired by a patient plus bias flow and leakage;

    inspiration/expiration detection means operatively associated with said flow sensor for detecting the beginning and the end of a patient'"'"'s inspiration;

    modeling means operative upon detection of an end of inspiration by said inspiration/expiration detection means for generating a predicted expiration waveform based upon said measured airflow;

    comparator means for comparing actual airflow measured by said flow sensor to said predicted expiration waveform; and

    valve control means for operating said valve to conform said actual airflow to said predicted expiration waveform.

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