Non-invasive measuring method and apparatus of blood constituent

Details Non-invasive measuring method and apparatus of blood constituent Non-invasive measuring method and apparatus of blood constituent

1988-12-01

1990-05-22

Rosenberger, Richard A.

Optics: measuring and testing

Blood analysis

Hemoglobin concentration

128633, A61B 500, G01N 2117

Patent

active

049272640

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.

REFERENCES:
patent: 4167331 (1979-09-01), Nielsen
patent: 4222389 (1980-09-01), Rubens
patent: 4266554 (1981-05-01), Hamaguri
patent: 4463762 (1984-08-01), Rubens

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