Method for recognizing pulse rate and blood oxygen saturation degree through optical signal

Abstract

The invention discloses a method for recognizing pulse rate and blood oxygen saturation degree through an optical signal. The method comprises the following steps: S1, continuously acquiring red light electric signals converted from red light optical signals detected by a blood oxygen detection probe and filtering to obtain a sampled signal sequence; S2, setting an initialization process and an adaptive process of an amplitude threshold; S3, finding the wave crest and the wave trough of the sampled signal sequence according to the amplitude threshold obtained by the step S2; S4, calculating the pulse rate according to the wave crest and the wave trough of the sampled signal sequence; S5, processing infrared electric signals converted from infrared optical signals detected by the blood oxygen detection probe according to the steps S1 to S3 to obtain the wave crests and the wave troughs of the infrared electric signals, and calculating the blood oxygen saturation degree by combining the wave crests and the wave troughs of the infrared electric signals. By using the method, the pulse rate and the blood oxygen saturation degree can also be accurately recognized even under the condition of signal waveform base line drift caused by reasons such as hand movement or probe looseness.

Description

technical field [0001] The invention relates to the field of medical detection, in particular to a method for identifying pulse rate and blood oxygen saturation through optical signals. Background technique [0002] With the continuous development of modern medical technology and related disciplines, medical monitoring instruments have become an indispensable category of medical electronic instruments, and play an increasingly important role in hospitals. The use of monitoring equipment not only reduces the labor of medical staff, improves the efficiency of nursing work, but more importantly, enables doctors to keep abreast of the condition, and can deal with it in time when there is a critical situation, improving the quality of care. Among the monitored physiological parameters, in addition to ECG, blood pressure, etc., the determination of oxygen concentration in human blood, namely blood oxygen saturation and pulse rate, is also of great clinical significance. In the mo...

AI Technical Summary

Problems solved by technology

However, due to the movement of the patient's hand or the looseness of the probe, etc., the waveform will go up or down as a whole. This phenomenon is called baseline drift, such as Figure 4 The waveform shown is going upwards as a whole

It can be seen that when the baseline drifts, the misjudgment rate of the baseline method to identify peaks and troughs is very high, resulting in inaccurate calculated pulse rate and blood oxygen saturation.

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