Patent ID: 8092399
Filing Date: 2012-01-10
Classification: A61B

Abstract:
1. A sleep state measuring apparatus for detecting a biosignal which changes depending on a sleep state of a living body that gets on a mattress filled with a fluid, amplifying the biosignal, and estimating the sleep state based on the amplified biosignal, comprising: a detector which detects a static component P of a mattress internal pressure which is a pressure of the fluid in the mattress; a specifier which specifies a fluctuation part ΔV of the mattress internal pressure at a time of applying a predetermined, non-zero load which changes depending on the static component P from the static component P detected by the detector using a corresponded relation performed beforehand between the static component P of the mattress internal pressure and the fluctuation part ΔV of the mattress internal pressure; and an electronic calculator comprising a processor which is programmed with an algorithm to calculate an amplification factor A for input into a variable amplifier and used for amplification of the biosignal by correcting a predetermined standard amplification factor A wherein the detector detects the matress internal pressure which fluctuates in a state where the living body gets on the matress as the biosignal.