Pulse wave starting point real-time detection method resisting waveform change interference and application thereof

Abstract

The invention discloses a pulse wave starting point real-time detection method resisting waveform change interference and application of the method. The method is applied to the field of medical detection. The method includes the steps that human body pulse wave signals are acquired through a pulse wave sensing system and are filtered; first-order derivatives of the pulse wave signals are acquired, and first-order derivative signals are filtered; average slope values in front of and behind each point on first-order derivative waves are calculated according to a sliding window method, and trend change signals are acquired through subtraction of the average slope values; pulse wave starting points are defined as maximum values of the trend change signals in cardiac cycles. The trend change signals correspond to the change rates of radial vibration force applied to an artery tube wall when pulse waves reach measuring points physiologically, the maximum values of the trend change signals correspond to vibration force fastest change moments, namely, the pulse wave starting points. According to the method that the waveform trend change is calculated according to waveform information in sliding windows on the pulse waves, and pulse wave waveform deformation interference caused by motion, drug administration and other special states and noise and waveform baseline drift caused by mobile detection and other occasions can be effectively overcome.

Description

Technical field [0001] The invention relates to a real-time detection method and application of a pulse wave starting point resistant to the interference of waveform changes, and is applied in the field of medical detection. Background technique [0002] In each cardiac cycle, the heart rapidly ejects blood into the aorta, causing the aortic wall to stretch and produce mechanical waves, which propagate along the aortic wall to the branches and peripheral blood vessels, forming pulse waves. The pulse wave starts in the heart, passes through various arteries, tissues and organs, and generates complex reflection waves at the locations of artery branches, changes in tube diameter, and changes in tube wall material properties. Therefore, the pulse wave signals measured in various parts of the body are the superposition of the incident heart wave and multiple reflected waves, which contain rich cardiovascular system hemodynamic information. The measurement of pulse waves in clinic has...

AI Technical Summary

Problems solved by technology

However, for the complex and changeable actual measurement environment, the existing time-domain methods still have certain defects

For example, the local minimum method and the slope intersection method are not good at resisting the deformation of the pulse wave waveform caused by exercise, drugs and other factors, and the second-order derivative maximum method has poor noise immunity, etc.

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