Pulse oximeter sensor control system

Details Pulse oximeter sensor control system Pulse oximeter sensor control system

1987-10-08

1989-07-18

McGraw, Vincent P.

Optics: measuring and testing

Blood analysis

Hemoglobin concentration

128633, G01N 3349, A61B 500

Patent

active

048489018

ABSTRACT:
A pulse oximeter is provided including two light emitting diodes. Each LED is energized by a unique modulation signal. Light produced by the LEDs passes through the tissue of a subject and is detected by a photodiode. The photodiode signal is separated by tuned circuits resonant at the two modulation signal frequencies and physiological information signals are recovered from the separated signals by amplitude demodulation. The inventive arrangement provides identification of back-to-back coupled LEDs and narrow band filtering for good noise immunity.

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patent: 4653498 (1987-03-01), New, Jr. et al.

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