UNBLOODY INSTRUMENT FOR MEASURING ARTERIOVENOUS OXYGEN SATURATION

摘要

PROBLEM TO BE SOLVED: To provide an unbloody instrument for measuring an arteriovenous oxygen saturation with which the arteriovenous oxygen saturation is unbloodily measured without an auxiliary mechanism such as a cuff, and also the calibration of a measurement value obtained by using a standard oxygen saturation measuring instrument is not required.

SOLUTION: This unbloody instrument for measuring the arteriovenous oxygen saturation includes: first and second pulse rate arithmetic means for irradiating a living body 11 with first light and second light different in wave length, and calculating a pulse rate from signals based on each wave length; a first oxygen saturation calculating means 29 for calculating the oxygen saturation by the ratio of the respective output values of the first and second pulse rate arithmetic means; first and second change rate arithmetic means for removing a higher harmonic component from the signals based on the first and second wave lengths, and obtaining a change rate; and a second oxygen saturation calculating means 29 for outputting a venous oxygen saturation through the use of the ratio of the outputs of the first and second change rate arithmetic means.

COPYRIGHT: (C)2004,JPO