Method and apparatus for controlling a ventilator

  • US 20050109340A1
  • Filed: 09/07/2004
  • Published: 05/26/2005
  • Est. Priority Date: 11/21/2003
  • Status: Active Grant
First Claim
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1. An apparatus for automatically controlling a ventilator comprising:

  • first means for processing data indicative of at least a measured oxygen level of a patient, and for providing output data indicative of;

    required concentration of oxygen in inspiratory gas of the patient (FIO2) and positive end-expiratory pressure (PEEP) for a next breath of the patient;

    wherein FIO2 is determined to reduce the difference between the measured oxygen level of the patient and a desired value;

    wherein PEEP is determined to keep a ratio of PEEP/FIO2 within a prescribed range and, while keeping the ratio within the prescribed range, to keep the measured oxygen level of the patient above a predefined value; and

    second means, operatively coupled to the first means, for providing control signals, based on the output data provided by the first means, to the ventilator;

    wherein the control signals provided to the ventilator automatically control PEEP, and FIO2, for a next breath of the patient.

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