Calculation Method of Arterial Oxygen Saturation Based on Dual-Wavelength Photoplethysmography Characteristic Quantities

Abstract

The invention discloses a calculation method for arterial oxygen saturation by using the characteristic quantity of a dual-wavelength photoelectric volume pulse wave. The calculation method comprises the following steps of synchronously acquiring pulse oximeter signals with different wavelengths under sources during a period of time and taking the logarithm to obtain a logarithmic under two wavelengths; extracting characteristic quantities of dual wavelengths by using an extraction method for direct current characteristic quantity and alternating current characteristic quantity of the dual wavelengths in a time domain or a frequency domain; removing the direct current characteristic quantity and the alternating current characteristic quantity which have gross errors according to the 3sigma criterion, and taking a mean value of the direct current characteristic quantity and the alternating current characteristic quantity of which coarse noises are removed as a final characteristic quantities of dual-wavelength photoelectric volume pulse wave; extracting a certain quantity of characteristic quantity samples of the photoelectric volume pulse wave, measuring a truth value of the arterial oxygen saturation by using a blood-gas analyzer, and establishing a correction model of the truth value of the arterial oxygen saturation and the characteristic quantity of the photoelectric volume pulse wave; extracting the characteristic quantity of the photoelectric volume pulse wave of a detected object, and calculating the arterial oxygen saturation by using the correction model.

Description

technical field [0001] The invention relates to the field of calculation of arterial blood oxygen saturation, in particular to a method for calculating arterial blood oxygen saturation of dual-wavelength photoplethysmography characteristic quantities. Background technique [0002] The existing non-invasive pulse oximeter has the problem of low measurement accuracy, and when the blood oxygen concentration is low, the error of the measurement result increases significantly. The fundamental reason is that the existing pulse oximeter is based on the blood oxygen saturation measurement principle of the Lambert-Beer law, which does not consider the influence of scattering and introduces measurement errors in principle. [0003] When using the Lambert-Beer law to derive the blood oxygen saturation formula, the following assumptions are usually made: [0004] (1) The light scattering effect of human tissue and blood components is not considered. [0005] (2) Assume that the finger...

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Problems solved by technology

[0011] The present invention provides a dual-wavelength photoplethysmography characteristic quantity calculation method for arterial blood oxygen saturation. The present invention solves the problem of how to compensate the influence of human tissue and blood scattering on the measurement of arterial blood oxygen saturation. See the description below for details. :

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