Blood constituent monitoring apparatus and methods with frequenc

Details Blood constituent monitoring apparatus and methods with frequenc Blood constituent monitoring apparatus and methods with frequenc

1987-12-02

1989-01-31

Chambers, A. Michael

Surgery

Truss

Pad

356 41, 36441309, A61B 500

Patent

active

048008850

ABSTRACT:
Apparatus and method for measuring the level of a constituent such as oxygen in the blood of a living subject. Light at a plurality of wavelengths is emitted and directed through the patient's body to a photodetector. The amplitude of the emitted light at each wavelength is varied in accordance with a different carrier frequency, and the photodetector signal thus includes a component at each carrier frequency. Each such component represents transmissivity of the body structure at one wavelength of the emitted light. The photodetector signal is subdivided by frequency so as to separate the components at the different carrier frequencies. The constituent level is determined from these separated components.

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

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