Patent ID: 7011091

Claim:
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.