Calculation method for extracting conduction time from pulse wave

Abstract

The invention discloses a calculation method for extracting a conduction time from a pulse wave, comprising the steps of: acquiring a pulse wave signal; carrying out quadratic differential and filtration on the obtained pulse wave signal; carrying out data splitting on the accelerated pulse wave after the quadratic differential through searching splitting feature points; searching C feature points in allusion to different data intervals after splitting; and calculating the conduction time by utilizing the searched feature points. According to the calculation method, the pulse wave signal is analyzed and processed, then a correct conduction time value can be searched and calculated and the changes of positions of the feature points can be correctly captured by using corresponding different algorithms when the positions of the feature points change under the influence of blood pressure values, so that the correctness and stability of the calculation of the conduction time are improved. The calculation method has the advantages of being correct, stable, simple, practical and the like.

Description

technical field [0001] The invention belongs to the field of medical signal processing, and relates to a calculation method of the conduction time in a pulse signal, which is particularly suitable for the calculation method of the conduction time in the detection of blood pressure and other blood flow parameters. Background technique [0002] Pulse wave transit time is an important physiological parameter in the human blood circulation system, which reflects the degree of elasticity and hardening of the blood vessel wall, and there is a linear relationship between the conduction time and arterial blood pressure. Therefore, accurate acquisition of the conduction time is essential for medical diagnosis and scientific research. has a very important meaning. [0003] There are generally three methods for extracting the conduction time: the first method is to collect vascular pulse waveforms at different positions in the artery, and then calculate the conduction time required for...

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Problems solved by technology

[0003] There are generally three methods for extracting the conduction time: the first method is to collect vascular pulse waveforms at different positions in the artery, and then calculate the conduction time required for this distance, but this method has strict requirements on the position. And it is necessary to realize the synchronization of two-point waveform acquisition. If the position changes slightly or the waveform is not synchronized, a large error will often occur

The second method is the ECG pulse method, which expresses the conduction time by collecting the ECG signal and the pulse signal at the end of the artery, and calculating the time interval between the corresponding feature points of the ECG signal and the pulse signal, but this method needs to collect the ECG signal, increasing Many operations are difficult, and it is extremely inconvenient to apply in the product, which also makes the monitoring of this parameter meaningless

The third method is the accelerated pulse wave extraction method, which collects the volumetric pulse wave and obtains the accelerated pulse wave through two differentials, and extracts the transit time from the accelerated pulse wave. Although this method requires less detection equipment, and the transit time The regularity changes obviously, but because the position of the corresponding feature point of the accelerated pulse wave changes with the blood pressure value, and the waveform shape of the feature point at different positions will be slightly different accordingly, it is still difficult to accurately identify it from the waveform. A more accurate calculation method of conduction time

[0004] To sum up, there are still deficiencies in the acquisition and extraction methods in the calculation of conduction time, and there are no reports on the use of data segmentation and interval search methods

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