Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Patent
1991-03-19
1994-11-22
Burr, Edgar S.
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
12820222, 12820421, 12820511, 12820523, A61M 1600
Patent
active
053659228
ABSTRACT:
An adaptive controller for delivering a fractional amount of oxygen to a patient. The controller utilizes an oximeter coupled by a non-invasive sensor to the patient for measuring the blood hemoglobin saturation in the patient. The oximeter generates a plurality of blood saturation output signals over a given period of time which are sequentially representative of the patient's blood hemoglobin saturation. A processing means evaluates a plurality of the oximeter output signals and, based on the evaluation, provides a pseudo blood saturation signal. A feedback control means responsive to the pseudo output signal sets the fractional amount of oxygen to be delivered to the patient. When deviations of the oximeter output signal are excessive, the pseudo output signals cause a gradual increase in the fractional amount of oxygen for the patient. Furthermore, the feedback control means is periodically disconnected, and the response of the patient to random changes in the fractional amount of oxygen delivered to the patient is used to adapt the response characteristics of the feedback control means in a manner tailored to the needs of the patient.
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Brigham and Women's Hospital, Inc.
Burr Edgar S.
Lewis Aaron J.
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