BIOLOGICAL INFORMATION MEASUREMENT SYSTEM

摘要

A light emitting unit emits first light and second light having different wavelengths. A photoreception unit outputs first and second signals depending on photoreception intensities of the first and second light transmitted through or reflected by biological tissue. A processing period setting unit extracts a signal cycle corresponding to the cardiac cycle for the first or second signal and sets a processing period in a first part dominantly affected by arterial blood flowing to the tissue or a second part dominantly affected by venous blood flowing from the tissue in the signal cycle. First and second change amount acquisition units obtain first and second change amounts corresponding to the attenuation change amounts of the first and second light from the first and second signals in the processing period. A concentration calculation unit calculates the concentration of light absorbing substance in blood from the first and second change amounts.

主权项

1. A biological information measurement system comprising:
a light emitting unit configured to emit first light having a first wavelength and second light having a second wavelength; a photoreception unit configured to output a first signal and a second signal depending on photoreception intensity of the first light and photoreception intensity of the second light that has passed through biological tissue of a subject or that is reflected by the biological tissue of the subject; a processing period setting unit configured to extract a signal cycle corresponding to a cardiac cycle of the subject for one of the first signal and the second signal, and further configured to set a first processing period in one of a first period in which an effect of arterial blood flowing to the biological tissue is dominant and a second period in which an effect of venous blood flowing from the biological tissue is dominant in the signal cycle; a first change amount acquisition unit configured to obtain a first change amount corresponding to an attenuation change amount of the first light based on the first signal in the first processing period; a second change amount acquisition unit configured to obtain a second change amount corresponding to an attenuation change amount of the second light based on the second signal in the first processing period; a first concentration calculation unit configured to calculate a first concentration of a light absorbing substance in blood of the subject based on the first change amount and the second change amount; and an output unit configured to provide the first concentration.