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Medical ventilator

  • US 5,303,698 A
  • Filed: 08/27/1991
  • Issued: 04/19/1994
  • Est. Priority Date: 08/27/1991
  • Status: Expired due to Term
First Claim
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1. A medical ventilator for controlling the pressure of gas within a patient'"'"'s respiratory tract, comprising:

  • (a) a source of inspiratory gas;

    (b) an inspiratory conduit for directing the flow of said inspiratory gas from said source to said patient'"'"'s mouth;

    (c) inspiratory flow-control means for controlling the flow of said inspiratory gas within said inspiratory conduit;

    (d) means for measuring the actual pressure of gas at a location such that the measurement is indicative of the actual pressure within said patient'"'"'s respiratory tract;

    (e) first comparator means for comparing said actual pressure with a desired pressure and for generating a first error signal indicative of the difference between said actual pressure and said desired pressure;

    (f) processing means for processing said first error signal and for generating a first control-signal, in response to said first error signal, said processing means further comprising means for executing an inspiratory control function having a first time constant and for controlling said inspiratory flow-control means to cause said actual pressure to track said desired pressure; and

    (g) time-constant updating means for updating the value of said first time constant.

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