Patent ID: 8428672

Claim:
A method for delivering oxygen to a patient with a mechanical ventilator, the method comprising: (a) supplying fractionally inspired oxygen (FlO 2 ) to a patient based on a target oxygen saturation (SpO 2 ), wherein the target SpO 2 is set a lower limit of clinical acceptability of SpO 2 for the patient to conserve oxygen; (b) monitoring SpO 2 returned from the patient; (c) determining an error between the monitored SpO 2 and the target SpO 2 and while the error is greater than a predetermined error iteratively performing, (d) determining a gain factor such that increases to FlO 2 are greater than decreases for a magnitude of the determined error; (e) determining a correction factor by multiplying the determined gain factor by the magnitude of the error; (f) applying the correction factor to the supplied FlO 2 ; and further comprising waiting a first predetermined time period before iteratively performing steps (c)-(f).