Method and apparatus for continuously measuring blood pressure

Abstract

The present invention relates to a method for continuously measuring blood pressure and its equipment. Said method is characterized by that it creates a regression equation between pulse wave conduction time and arterial pressure: BP=a+b*PWTT for measurand person; and utilizes personalization correction technique to define intercept and regression coefficient b of measurand person. Besides, said invention also provides a method for continuously obtaining pulse wave conduction time PWTT by using pulse wave of human body, electrocardiogram signal and phonocardiogram signal and its concrete steps. Said method can raise accuracy for continuously measuring blood pressure, and can be used for measuring head blood pressure.

Description

technical field [0001] The invention belongs to a method and a device for measuring human arterial blood pressure, in particular to a method and a device for non-invasive continuous blood pressure measurement of a human body. Background technique [0002] Blood pressure measurement methods can generally be divided into two categories: invasive measurement and non-invasive measurement, and non-invasive methods can be divided into two categories: intermittent and continuous. Intermittent measurement is the blood pressure value at a specific measurement moment. Since the pressure of blood on the arterial wall is changing at each heartbeat and at each time point in each beat, the systolic blood pressure and diastolic blood pressure measured by this method are not necessarily the representative blood pressure of the subject, and they are not the same time. Numerical values ​​in heartbeats. Continuous can measure blood pressure without interruption, it can provide stroke-per-str...

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Problems solved by technology

[0009] Since the peak value of the R wave in the electrocardiogram itself cannot represent the moment when the heart ejects blood, the R wave pulse wave transit time RWPWTT obtained by the above method cannot really represent the time for the pulse wave to travel from the heart to the peripheral artery. In fact, the above R Pulse wave transit time RWPWTT also includes systolic onset RWPIT and isovolumic systolic ICT (see figure 2 ), if these two components are constant, then they will not affect the final result, but if they are variables, they will definitely affect the accurate representation of pulse wave transit time RWPWTT on blood pressure changes

Through the applicant's research, it is found that: the R-wave systolic initiation period (RWPIT) and the isovolumic systole (ICT) in the above-mentioned RWPWTT time composition have variability under different conditions, which will inevitably lead to the measurement of blood pressure with the R-wave pulse wave transit time. inaccuracy of

[0010] Especially if the pulse wave transit time RWPWTT of the above method is used to represent the head blood pressure, due to the short chest-head distance and short conduction time, it will affect its accuracy. The change of head blood pressure not only reflects the blood supply to the brain, but also reflects the The regulation of the autonomic nerves of the heart when the head blood pressure changes, and the continuous monitoring of head blood pressure changes are of great significance in military applications such as aviation and aerospace and clinical work. However, the existing R wave pulse wave transit time RWPWTT method for measuring blood pressure is due to Its inaccuracy precludes continuous monitoring of changes in head blood pressure

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