Blood constituent monitoring apparatus and methods with frequency division multiplexing
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United States of America Patent
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Jan 31, 1989
Grant Date -
N/A
app pub date -
Dec 2, 1987
filing date -
Dec 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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