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Ventilator control system using sensed inspiratory flow rate

  • US 5,107,831 A
  • Filed: 06/06/1991
  • Issued: 04/28/1992
  • Est. Priority Date: 06/19/1989
  • Status: Expired due to Term
First Claim
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1. A method of controlling a time-cycled constant-flow, pressure-limited medical ventilator during the ventilation of a patient, wherein the ventilator has a selectable breath rate interval, the method comprising the steps of:

  • (a) sensing the inspiratory flow rate of the patient and generating a flow rate signal;

    (b) selecting a flow rate threshold value;

    (c) selecting an episode time interval;

    (d) selecting a number of ventilator-delivered breaths;

    (e) comparing the flow rate signal value to the selected flow rate threshold value during the selected episode time; and

    (f) actuating the ventilator to deliver the selected number of ventilator-delivered breaths to the patient if the flow rate signal value remains below the selected flow rate threshold value throughout the duration of the selected episode time interval.

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