PULSE PHOTOMETER AND METHOD FOR CALCULATING CONCENTRATION OF LIGHT ABSORBER IN BLOOD

摘要

A pulse photometer includes: a first variation acquirer acquiring a first variation corresponding to a light attenuation variation of a first light beam due to pulsation of blood in a subject, based on a first intensity signal corresponding to an intensity of the first light beam that is transmitted through or reflected from a body of the subject, and that has a first wavelength; a second variation acquirer acquiring a second variation; and a concentration calculator calculating a blood light absorber concentration, based on the first and second variations, the second variation containing a first offset which is based on an inverse of the light attenuation variation of the first light beam.

主权项

1. A pulse photometer comprising:
a first light emitter which is configured to emit a first light beam having a first wavelength; a second light emitter which is configured to emit a second light beam having a second wavelength; a light detector which is configured to output a first intensity signal in accordance with an intensity of the first light beam that is transmitted through or reflected from a body of a subject, and a second intensity signal in accordance with an intensity of the second light beam that is transmitted through or reflected from the body of the subject; a first variation acquirer which is configured to acquire a first variation corresponding to a light attenuation variation of the first light beam due to the pulsation of the blood in the subject, based on the first intensity signal; a second variation acquirer which is configured to acquire a second variation corresponding to a light attenuation variation of the second light beam due to the pulsation of the blood in the subject, based on the second intensity signal; and a concentration calculator which is configured to calculate a blood light absorber concentration, based on the first variation and the second variation, the second variation containing a first offset which is based on an inverse of the light attenuation variation of the first light beam.