Patent ID: 9597025
Date: 2017-03-21
CPC Classifications: A61B,G01N

Claim:
1. A biological signal measuring system comprising: a light emitter which is configured to emit light beams to a living tissue of a subject, the light beams having different N kinds of wavelengths, where N is an integer of four or more; a light receiver which is configured to output N kinds of signals respectively in accordance with received light intensities of the N kinds of light beams that have been passed through or reflected from the living tissue of the subject; a first calculating section which is configured to acquire N kinds of light attenuations based on the N kinds of signals; a second calculating section which is configured to acquire (N−1) kinds of blood-derived light attenuations based on two light attenuations related to (N−1) kinds of combinations selected from the N kinds of light attenuations; a third calculating section which is configured to identify concentrations of (N−1) kinds of in-blood substances based on the (N−1) kinds of blood-derived light attenuations; and an outputting section which is configured to output the identified concentrations, wherein the light attenuations are acquired based on changes of the received light intensities of a first timing during pressurization in which a pressure is applied to the living tissue and of a second timing before the pressurization or after release of the pressurization, wherein the pressure substantially eliminates both arterial and venous blood from the living tissue.