OXYGEN SATURATION DEGREE MEASURING DEVICE AND OXYGEN SATURATION DEGREE MEASURING METHOD

To provide an oxygen saturation degree measuring device and an oxygen saturation degree measuring method capable of measuring an oxygen saturation degree even by a signal with a small fluctuation component, by which measurement of an oxygen saturation degree is difficult on a conventional oxygen saturation degree measuring device.SOLUTION: A biological tissue is irradiated with lights of different wavelengths, and the light passing through the biological tissue or the light reflected by the biological tissue is received. Not only in the case where a peak value and a bottom value of a signal of a fluctuation component are clearly shown in a received signal, but also in the case where a peak value and a bottom value are not clear, a root mean square of the signal of the fluctuation component is calculated, and using the result of this calculation, a predetermined ratio is calculated to obtain an oxygen saturation degree.SELECTED DRAWING: Figure 2 【課題】従来の酸素飽和度測定装置では測定することが難しい変動成分の小さい信号によっても酸素飽和度を測定することができる酸素飽和度測定装置および酸素飽和度測定方法を提供する。【解決手段】波長の異なる光をそれぞれ生体組織に照射し、生体組織を透過する光、あるいは生体組織で反射する光を受光する。このとき受光する信号が、変動成分の信号のピーク値とボトム値が明確に表れる場合だけでなく、ピーク値とボトム値が明確でない場合であっても、変動成分の信号の二乗平均平方根を算出し、この算出結果を用いて所定の比を算出することで酸素飽和度を知ることができる。【選択図】図２