Pulse oximetry
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United States of America Patent
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Jul 11, 1995
Issued Date -
N/A
app pub date -
Jun 17, 1991
filing date -
May 5, 1988
priority date (Note) -
Expired
status (Latency Note)
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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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