Importance

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Abstract

A pulse oximeter includes light-emitting devices for irradiating different wavelengths of light into a living tissue through which arterial blood flow, a light-receiving device for detecting at least one of transmitted and reflected light after the different wavelengths of light have been absorbed by the living tissue, first correlation function computing device for determining first correlation function for the waveform of received light at one of the different wavelengths obtained from the output of the light-receiving device, second correlation function computing device for determining second correlation function for the waveforms of received light at another of the different waveforms obtained from the output of the light-receiving device, dividing device for determining the ratio between the first correlation function obtained by the first auto-correlation function computing device and the second correlation function obtained by the cross-correlation function computing device, the ratio determined on the basis of appropriate values of the two correlation functions, and computing device for calculating the oxygen saturation of the arterial blood on the basis of the output of the dividing device.

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First Claim