Non-invasive measuring method and apparatus of blood constituents
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United States of America Patent
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May 22, 1990
Grant Date -
N/A
app pub date -
Dec 1, 1988
filing date -
Dec 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to measure the oxygen saturation in venous blood, a venous blood stream is made time-variant by applying pressure with a peak value of the minimum blood pressure to a proximal portion from a measuring part. Light beams with different wavelengths are transmitted from the measuring part and detected by photodiodes. Photodetected signals are logarithm-converted and venous signal components are separated from logarithm-converted signals with a filter circuit. The oxygen saturation of venous blood is calculated on the basis of separated venous signal components.
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