Noninvasive and continuous blood pressure monitoring method and device based on pulse wave propagation time

Abstract

The invention provides a noninvasive and continuous blood pressure monitoring method and device based on pulse wave propagation time. The noninvasive and continuous blood pressure monitoring method and device are characterized in that standard II-lead ECG signals of a testee is detected through an electrocardiosignal detection unit under three body positions, including the body positions generated when the testee lies on his / her back, stands with arms vertically lifted and stoops, meanwhile PPG signals at the ends of index fingers are detected through a volume pulse wave signal detection unit, the time difference between the wave peak value point R of the ECG signals and the characteristic point of the PPG signals is measured through an upper computer signal processing unit and serves as the pulse wave propagation time PTT, correlation analysis and linear-regression analysis are conducted on the obtained PTT data and blood data recorded by an electronic sphygmomanometer, a regression equation of the PTT to blood pressure is established, and the blood pressure value is obtained indirectly by measuring the PTT. By means of the noninvasive and continuous blood pressure monitoring method and device, accuracy of continuous blood pressure detection and comfort of the testee can be effectively improved, long-term noninvasive and continuous blood pressure measuring can be achieved, portability of the device is high, great convenience is brought to examination operation, and real-time detection of the blood pressure value is achieved easily.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a non-invasive continuous blood pressure monitoring method and device based on pulse wave propagation time. Background technique [0002] Since blood pressure parameters are easily affected by various factors such as environmental conditions and physical conditions, there are large differences in the results of intermittent measurement or single measurement. However, the continuous measurement method of blood pressure can measure blood pressure in each cardiac cycle. more important in clinical practice. [0003] At present, blood pressure measurement methods can be roughly divided into two categories: direct measurement method and indirect measurement method. The direct measurement method is to directly insert the catheter of the continuous blood pressure sensor into the heart or aorta through the skin to detect the blood pressure signal, and can perform continuous measu...

AI Technical Summary

Problems solved by technology

[0009] (1) The direct blood pressure measurement method requires the catheter to be directly inserted into the heart and aorta through the skin to detect blood pressure signals, so this technique requires high technical requirements and is traumatic to a certain extent, so it is only suitable for the rescue of major surgery patients and critically ill patients;

[0010] (2) Both the Korotkoff sound method and the oscillometric method require the cuff to compress the blood vessels, which causes discomfort to the subjects, and it is not suitable to use this method when continuously observing blood pressure for a long time;

[0011] (3) Although the constant volume method can detect subtle changes in blood pressure, its long-term measurement will cause venous congestion, which will affect the measurement accuracy and bring discomfort to the subject, and the measured systolic blood pressure has a large dispersion. The index did not meet the AAMI recommended standard deviation of no more than 8mmHg, and the instrument was more complicated;

[0012] (4) The measurement accuracy of the flat tension method is high, which can basically meet the requirements of non-invasive continuous measurement of blood pressure for a long time. However, due to the high sensitivity of the sensor to displacement, it is difficult to keep the position of the sensor relatively fixed for a long time. The comfort of the tester and the simplification of operation need to be improved;

The disadvantage is that the movement of the subject can cause changes in the acoustic path of the sensor and the vessel wall

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