Patent ID: 8275433

Claim:
A non-invasive blood constituents measuring instrument comprising: a light source for irradiating light in the near infrared range including plural wavelengths to a living body whose blood constituent concentrations are unknown; a light receiver to detect light transmitted through the living body or reflected therefrom; an active spectroscope for separating the light into plural wavelengths in the near infrared range at an interval of 40-50 ms period of time; a spectrum analyzer to which the output signal of the light receiver is supplied and which analyzes spectrum of the light transmitted through the living body or reflected therefrom at different times having a shorter time intervals than a cycle time of the arterial waveform cycle; a spectrum subtraction generator to generate a plurality of spectrum subtractions from the spectrum of the light measured by the spectrum analyzer at any two different times corresponding to time intervals of 40-50 ms; and a blood constituent concentrations predictor into which the output data of the spectrum subtraction generator is input and which outputs the blood constituent concentrations, wherein the blood constituent concentrations predictor comprises a multi-regression analyzing model; wherein the multi-regression analyzing model is calibrated by supplying plural sample data comprising spectrum subtractions obtained non-invasively from a living body having known blood constituent concentrations as explanatory variables and the known blood constituent concentrations as objective variables, using the non-invasive blood constituents measuring instrument; wherein the output data of the spectrum subtraction generator obtained from the living body whose blood constituent concentrations are unknown is input to the blood constituent concentrations predictor and the blood constituent concentrations predictor outputs the blood constituent concentrations calculated by the calibrated multi-regression analyzing model.