A Correlation Based Acquisition Method of Pulse Transit Time

A technology of conduction time and acquisition method, which is applied in the field of pulse wave transit time acquisition, can solve problems such as inaccuracy and inaccurate identification, and achieve the effect of improving accuracy, good effect and large application prospect

Active Publication Date: 2019-12-27
苏州至心医疗科技有限公司
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Problems solved by technology

This method may be inaccurate in the final result due to the inaccurate identification of individual feature points

Method used

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  • A Correlation Based Acquisition Method of Pulse Transit Time
  • A Correlation Based Acquisition Method of Pulse Transit Time
  • A Correlation Based Acquisition Method of Pulse Transit Time

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[0036] 1. Using the Analog Discovery acquisition card to synchronously collect electrocardiographic signals (ECG) and photoelectric pulse wave signals (PPG), the sampling frequency is 2KHz, and upload the data (length: 8000) to the PC;

[0037] 2. Find an R wave in the ECG signal, then select a piece of data, and also select the same length of data in the PPG signal, and calculate the correlation coefficient between the ECG signal and the PPG signal;

[0038] 3. Move the photoelectric pulse wave signal to the left by 1 unit (0.5×10 -3 s), then calculate the correlation coefficient with the above-mentioned ECG signal, and judge whether it is the maximum value;

[0039] 4. If figure 2 As shown, move 1, 2, 3, ..., m units to the left in turn, and calculate the correlation coefficient of the ECG signal and the photoelectric pulse wave respectively;

[0040] 5. If figure 2 As shown, select a value with the largest correlation coefficient, record the translation amount i (i≤m) ...

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Abstract

The invention relates to a pulse wave conduction time acquisition method based on correlation. The pulse wave conduction time acquisition method based on correlation includes the steps: utilizing an electrode slice and a photoelectric pulse wave sensor to synchronously acquire a human body ECG (electrocardiograph) signal and a photoelectric pulse wave signal; determining the correlation coefficient formula of the data of the human body ECG signal and the data of the photoelectric pulse wave signal in a set length; in a time domain, moving the photoelectric pulse wave signal to the left with offset of one unit, and utilizing the correlation coefficient formula to compute the correlation coefficient of ECG and PPG after offset; repeatedly computing the correlation coefficient of the ECG and the PPG until obtaining m correlation coefficients; and selecting the maximum correlation coefficient among the m correlation coefficients, and using the position number I to represent the offset, moved by the photoelectric pulse wave, corresponding to the correlation coefficient so as to obtain the pulse wave conduction time PTT = i*0.5*103. The pulse wave conduction time acquisition method based on correlation selects the region of the ECG signal and the photoelectric pulse wave signal, and improves the accuracy for measurement of pulse wave conduction time, and can get better effect while gauss white noise and baseline drift are added, thus having greater potential application prospects.

Description

technical field [0001] The invention relates to a method for acquiring pulse wave transit time. In particular, it relates to a method for acquiring pulse wave transit time based on correlation. Background technique [0002] The pulse wave transit time is the transit time of the human arterial pulse pressure wave in the arterial blood vessel. There are generally two types of methods for obtaining pulse wave transit time. One is the conventional method, which calculates two pulse wave signals at different positions and calculates the pulse wave transit time. The other measurement method is to use ECG signals and pulse wave signals to measure Pulse wave transit time. [0003] The conventional measurement method is to measure the arterial pulse wave at two different positions synchronously during the pulse wave propagation process, and obtain the pulse wave transit time by measuring the propagation time of a corresponding point, but because the pulse wave is a multi-harmonic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/02A61B5/0402A61B5/00
CPCA61B5/02A61B5/7235A61B5/7246A61B5/318
Inventor 王慧泉赵彦峰朱豪杰王金海赵喆于双
Owner 苏州至心医疗科技有限公司
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