Title:
APPARATUS FOR MEASURING CONCENTRATION AND OXYGEN SATURATION OF HEMOGLOBIN
Document Type and Number:
WIPO Patent Application WO/1989/001144
Kind Code:
A1
Abstract:
A light beam having a first wavelength (lambda1) is applied to the blood from a first light radiation section, while a light beam having a second wavelength (lambda2) is applied from second and third light radiation sections different in positions from the first radiation section and from each other to the blood and the respective reflected light intensity (I1, I2, I3) is detected. A first correction value (X) for correcting the reflected light intensity ratio (I2/I3) is calculated by a first correction value operation section (40) and a second correction value (C1) is calculated by a second correction value operation section (42) by use of this first correction value and the reflected light intensity (I3). The reflected light intensity ratio (I1/I2) is corrected by use of this second correction value and an oxygen saturation in the blood is operated based on correlation function by use of the corrected reflected light intensity ratio (Rs). The reflected light intensity ratio (I2/I3) is corrected by the coefficient of correction thus operated and the hemoglobin concentration in the blood is operated based on correlation function by use of the reflected light intensity ratio thus corrected.
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Inventors:
KOHNO HIROMASA (JP)
HONDA HIROAKI (JP)
NUDESHIMA MASAHIRO (JP)
HONDA HIROAKI (JP)
NUDESHIMA MASAHIRO (JP)
Application Number:
PCT/JP1988/000742
Publication Date:
February 09, 1989
Filing Date:
July 22, 1988
Export Citation:
Assignee:
TERUMO CORP (JP)
International Classes:
A61B5/00; G01N21/31; (IPC1-7): G01N21/31; A61B5/14
Foreign References:
| JPH05350880A | ||||
| JPH05718131B |
Other References:
See also references of EP 0380664A4
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