Reflective pulse blood oxygen detecting method based on diffusion theory

Abstract

The invention belongs to the technical field of human body physiological parameter measurement, and relates to a reflective pulse blood oxygen detecting method based on diffusion theory, which includes the steps: (1) establishing the relationship between organizer absorption coefficient and SaO2 (oxygen saturation); (2) establishing the relationship between reflection light intensity and organizer absorption coefficient; (3) establishing the relationship between an R value and the reflection light intensity; (4) acquiring pulse wave signals of a red light wavelength and a near-infrared light wavelength; (5) detecting features of pulse wave signals of the infrared light wavelength to extract peak values which are the maximum value and the minimal value of the reflection light intensity; (6) calculating blood oxygen saturation coefficient R; and (7) plugging the R value into a calibration curve to obtain needed blood oxygen saturation coefficient in real time. The reflective pulse blood oxygen detecting method based on the diffusion theory can be used for realizing non-invasive real-time measurement, and is higher in precision and wider in application range.

Description

technical field [0001] The invention belongs to the technical field of measuring human physiological parameters, and relates to a pulse blood oxygen detection method. Background technique [0002] The physiological activities of the human body require internal energy and nutrients, and different activities require different energy. Blood transports oxygen and nutrients to organs and plays a vital role in the body's metabolism. Hypoxia will affect the normal operation of a series of functions of the human body, causing symptoms of hypoxia in mild cases, and life-threatening in severe cases. Therefore, the monitoring of oxygen transport and combination process in human tissue, the concentration of oxygen in human internal tissue and blood has far-reaching significance for clinical diagnosis and treatment. [0003] Oxygen saturation detection provides timely and effective clinical evidence for doctors in clinical anesthesia operations and intensive care applications, and is a...

AI Technical Summary

Problems solved by technology

The oximeter based on the original Lambert Beer's law as the theoretical model takes the change of blood volume and arterial blood absorption coefficient as the investigation object, and ignores the scattering of light by the tissue, which leads to the deviation of the calculation result.

Generally, the measurement accuracy of the blood oxygen value is 2% to 6% in the range of 75% to 100%, and the error of this measurement value is larger when the blood oxygen saturation is low

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