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Average volume ventilation

  • US 7,011,091 B2
  • Filed: 09/13/2002
  • Issued: 03/14/2006
  • Est. Priority Date: 06/15/1999
  • Status: Expired due to Term
First Claim
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1. A method of adjusting a volume of a breathing gas supplied to a patient, the method comprising the steps of:

  • (a) supplying a flow of breathing gas to a patient over a plurality of respiratory cycles of such a patient;

    (b) determining, for each respiratory cycle, a tidal volume of the flow of breathing gas received by such a patient;

    (c) determining an average tidal volume of the flow of breathing gas received by such a patient from the volumes of breathing gas received by such a patient during the plurality of respiratory cycles;

    (d) determining an average error volume by comparing the average tidal volume to a predetermined target volume;

    (e) adjusting a pressure of the flow of breathing gas based on the average error volume;

    (f) determining, for each respiratory cycle, whether the tidal volume of the flow of breathing gas received by the patient is within normal parameters;

    (g) discarding the tidal volume for a respiratory cycle that is not within normal parameters; and

    (h) using the tidal volume for a respiratory cycle in step (c) if the tidal volume is within normal parameters.

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