Sensor, apparatus and method for non-invasive measurement of oxy

Details Sensor, apparatus and method for non-invasive measurement of oxy Sensor, apparatus and method for non-invasive measurement of oxy

1991-01-23

1993-02-23

Howell, Kyle L.

Surgery

Truss

Pad

128666, 356 41, A61B 500

Patent

active

051881080

ABSTRACT:
A sensor for non-invasive measurement of oxygen saturation using the reflection method comprises a red transmitter (55), an infrared transmitter (58) and a receiver (57). The distances between the transmitters and the receiver are selected such that the length of the light path (60, 61) between the red transmitter (55) and the receiver (57) is substantially equal to the length of the light path (62, 63) between the infrared transmitter (58) and the receiver (57). The sensor comprises a further red transmitter (56) which is used for another application at the human body or another tissue characteristics where the depth of penetration at the various wavelengths is different from the shown example. Together with an appropriate oximeter, manual or automatic adaptation is possible. Further signal improvement may be obtained by autocorrelating the received signal, detecting its frequency and cross-correlating it with a pattern function of the same frequency.

REFERENCES:
patent: 4714341 (1987-12-01), Hamaguri et al.
patent: 4942877 (1990-07-01), Sakai et al.
patent: 5057695 (1991-10-01), Hirao et al.

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