Photoelectric oximeter

Details Photoelectric oximeter Photoelectric oximeter

1975-10-10

1976-12-21

McGraw, Vincent P.

Optics: measuring and testing

Blood analysis

128 2L, 356 41, 356181, G01N 3316

Patent

active

039985504

ABSTRACT:
An optical non-invasive oximeter for measuring oxygen saturation in arterial blood utilizes a light source capable of giving off light having different wavelengths, such as light in the infrared and red region, and a pair of photoelectric devices, one responding to one wavelength and the other to the other wavelength, for detecting the amount of such light transmitted through living tissue. Each photoelectric device is connected to a computing circuit which generates a signal that represents the logarithm of the quotient of the signal received from the photoelectric device divided by its direct current component. The signals from each of the computing circuits are differentiated and then divided, one by the other, to provide an indication of oxygen saturation in the blood.

REFERENCES:
patent: 2640389 (1953-06-01), Liston
patent: 3628525 (1971-12-01), Polanyi et al.
patent: 3704706 (1972-12-01), Herczfeld et al.
"Photoelectric Determination of Arterial Oxygen Saturation in Man," Wood et al; Journal of Laboratory & Clinical Medicine; vol. 34, 1949; pp. 387-401.

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