Method for eliminating interference to blood oxygen saturation monitoring

Abstract

A method for eliminating interference to blood oxygen saturation monitoring includes steps of digitally filtering acquired red light and infrared light PPG (photoplethysmography) signals, removing low-frequency interference signals in direct current components, computing accurate direct-current component value, computing PPG signal envelope curves to extract alternating-current components, separating signals relevant with interference and serving the same as reference signals to be subjected to self-adaptive filtering, eliminating movement interference generated from aliasing of frequency and target signals in the alternating-current components, computing to obtain the accurate PPG alternating-current component value, and finally computing the blood oxygen saturation after the interference is eliminated according to the Lambert-Beer's law. The method is capable of suppressing movement interference well and computing to obtain the accurate blood oxygen saturation value. By extracting the reference signals directly from the red light and infrared light PPG signals to realize self-adaptive filtering, the method is simple in construction, simple in algorithm and small in computing number, has no need of an extra device for providing reference signals, is free of multiple self-adaptive filtering, and facilitates miniaturization and portability of monitoring equipment.

Description

technical field [0001] The invention relates to an interference elimination method, in particular to an interference elimination method for blood oxygen saturation monitoring. Background technique [0002] Compared with the traditional hospital environment blood oxygen saturation monitoring, the dynamic environment human blood oxygen saturation monitoring has a wider application prospect. It is used in pre-hospital first aid, battlefield soldier status monitoring, altitude sickness prevention, astronaut physiological state monitoring and other fields. can play a positive role. However, due to the influence of motion interference, the accuracy and stability of dynamic environmental blood oxygen saturation monitoring results are usually poor, which limits its development and application. [0003] In response to the above problems, in recent years, there have been many methods of suppressing motion interference at home and abroad, some have improved the probe structure, and so...

AI Technical Summary

Problems solved by technology

However, this algorithm needs to perform multiple adaptive filters in the range of 0-100% blood oxygen saturation to obtain a blood oxygen value. The algorithm is complex and the amount of calculation is large. limited, it is very difficult to realize

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