Patent ID: 6453184
Filing Date: 2002-09-17
Classification: A61B

Abstract:
A device for measuring a light absorption material in blood, comprising:light emitting means for emitting light, having a plurality of different wavelengths, onto a living tissue; light receiving means for receiving light outputted from the light emitting means and transmitted through or reflected from the living tissue, the light receiving means outputting a signal corresponding to an intensity of the light transmitted through or reflected from the living tissue; D.C./A.C. detecting means for obtaining a D.C. component and an A.C. component of a signal corresponding to each wavelength that is output from the light receiving means, respectively; A.C. to D.C. ratio detecting means for obtaining an A.C. to D.C. ratio signal, which is a ratio of the A.C. component to the D.C. component for each wavelength calculated by the D.C./A.C. detecting means; component extracting means for extracting a component from the A.C. to D.C. ratio signal having a predetermined frequency value, or a higher frequency value, for each wavelength which is obtained by the A.C. to D.C. ratio detecting means; extracted component ratio detecting means for obtaining a ratio of extracted component signals for corresponding different wavelengths outputted from the light receiving means, which is extracted by the component extracting means; and information detecting means for detecting information about a light absorption material in blood, based on the ratio detected by the extracted component ratio detecting means.