A real-time measurement and calculation method of heartbeat interval by ballistocardiogram

Abstract

The present invention provides a method for measuring and calculating real-time cardiac intervals of a ballistocardiogram, comprising the following steps: S1, collecting BCG signals; S2, performing preprocessing on the collected BCG signals, including filtering to remove thermal noise and baseline processing, and morphological filtering to remove Respiratory interference processing; S3, real-time positioning of each BCG signal J peak, measurement of real-time JJ interval; S4, calculation of instantaneous heart rate, multi-time scale average heart rate; S5, display of BCG waveform, instantaneous heart rate, multi-time scale average heart rate; solved The upper limit range of traditional BCG real-time heartbeat detection is too low (less than 120 beats / min), and it also solves the problem of excessive detection error of continuous heartbeat intervals caused by short-term body movement interference (<4s).

Description

technical field [0001] The invention relates to the technical field of medical measurement and calculation, in particular to a real-time measurement and calculation method of heartbeat interval by ballistocardiogram. Background technique [0002] A ballistocardiogram depicts the faint movements of the body caused by the shock and rebound of the heart and great blood vessels as the heart works and blood circulates. The shape of the ballistocardiogram curve is rich, including 5 bands of H, I, J, K, and L. Thanks to the rapid development of sensor technology, the acquisition of the ballistocardiogram can be relatively accurately acquired when the user is at rest. Since the ballistocardiogram is related to cardiac contractility, cardiac output, blood flow velocity, and great vessel elasticity, the collection and positioning of the ballistocardiogram signal is of certain significance for further analysis of heart rate variability and cardiac function tests. [0003] See attache...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are two problems. Problem 1: The basis of traditional instantaneous heart rate calculation is to identify the J peak of each BCG signal, and calculate the instantaneous heart rate of the current heartbeat with the help of the J-J interval of the adjacent BCG signal

Question 2: The general idea of ​​the traditional BCG signal positioning technology solution is: take the current BCG signal (i-th) J-peak time as the reference, traverse forward with a fixed time scale, and search for the next BCG signal (i+1) J-peak

Taking the commonly used search time scale of 0.5s-1.5s in the literature as an example, it is most suitable for scenarios with a heart rate of 120 beats / min. When the heart rate is higher than 120 beats / min, the above forward traversal interval not only ignores the A BCG signal (i+1th) J peak, but at the same time covers up to 3 non-adjacent BCG-J peaks (i+2, i+3 or even i+4th BCG signal), resulting in the inability to accurately measure heart rate Adjacent J-J intervals >120 beats / min

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