Pulse oximetry

Details Pulse oximetry Pulse oximetry

1991-06-17

1995-07-11

McGraw, Vincent P.

Surgery

Truss

Pad

356 41, A61B 500

Patent

active

054311594

ABSTRACT:
Non-invasive oximetry wherein red and infrared light from light sources energized at different frequencies is applied to arterial blood-containing tissue of a living subject. The red and infrared light coming from this tissue is sensed in order to obtain frequency-muliplexed information as to the absorption of said light by said tissue, the information being processed in order to derive therefrom a measure of percent oxygen saturation of said blood. The processing includes filtering for separating information represented by red light absorption from information represented by infrared light absorption. In particular, both notch and bandpass filters are used, and AM detectors provide for further separating such information into DC and AC components.

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