Double-air-bag oscillatory wave signal detecting method

Abstract

The invention discloses a double-air-bag oscillatory wave signal detecting method. The method is used for detecting air pressure in a sleeve band bound on one measured limb, and an oscillatory wave signal and mutual relation, variable speed pressurization is adopted in the pressurization process, the pressure required for blocking the measured artery is judged through the oscillatory wave signal measured by a downstream air bag second pressure sensor, and the phenomenon that a measurement result is lower than a real value due to discomfort and too low pressurization, brought by too high pressurization, of a measured person is avoided. The double-air-bag oscillatory wave signal detecting method adopts two pressure sensors, and the influence of surrounding noise on a microphone is avoided while the signal detecting sensitivity is improved. In addition, data acquisition of the two pressure sensors is synchronized in timing sequence so as to detect a pressure value through an upstream air bag first pressure sensor when it is judged that the artery is opened for blood flowing according to the second pressure sensor oscillatory wave signal detected by a downstream air bag.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a method for detecting oscillation wave signals of double airbags. Background technique [0002] Non-invasive blood pressure measurement methods mainly include auscultation, oscillometric method, and the method of using a microphone instead of a stethoscope, but they are all based on an inflatable airbag cuff. In the process of reopening the blocked arterial blood flow, the Korotkoff sound or pulse oscillation signal in the cuff is detected to realize the measurement of systolic blood pressure, diastolic blood pressure, mean pressure and pulse rate. [0003] However, blood pressure measurement by auscultation needs to be operated by trained professional medical personnel, which is not conducive to self-measurement of blood pressure by users at home; and this method cannot adapt to the measurement and monitoring of ambulatory blood pressure; at the same time, the accuracy ...

AI Technical Summary

Problems solved by technology

[0003] However, blood pressure measurement by auscultation needs to be operated by trained professional medical personnel, which is not conducive to self-measurement of blood pressure by users at home; and this method cannot adapt to the measurement and monitoring of ambulatory blood pressure; at the same time, the accuracy of blood pressure measurement is easily affected. The influence of ambient sound

The electronic method, which uses a microphone instead of a stethoscope, is also easily affected by ambient sounds, and the sensitivity of detecting sound in the cuff is weaker than that of the oscillometric method

[0004] For the oscillometric blood pressure measurement of a single balloon, compared with the auscultation method, the sensitivity of detecting the oscillating wave in the cuff is stronger, and it is not easily affected by the surrounding noise. However, there are still the following problems: (1) Due to the impact of the blood flow at the proximal end of the cuff, before the blood flow of the limb arteries is opened, an oscillation wave of a certain size can also be detected in the cuff (see appendix figure 1 , the pressure value and oscillation wave during the deflation process of a single balloon in a normal person), and as the pressure decreases, it also shows a trend of increasing gradually, so the pressure in the cuff is lower than the systolic pressure of the human body, and the arterial blood flow is reopened At the moment, the oscillating wave signal detected in the cuff has no clear sign, which is not conducive to the measurement of systolic blood pressure; (2) Due to the above reasons (1), the blood pressure measurement using the oscillometric method is generally the amplitude coefficient method, and the systolic blood pressure The magnitude coefficients of blood pressure and diastolic blood pressure are based on big data statistics, so there are certain individual differences, and there will be a large gap between the real blood pressure and the real blood pressure when measured by some users; (3) For patients with frequent premature beats or Arrhythmia patients with atrial fibrillation, because the strength of each heart pumping is different, the strength of the oscillatory wave signal generated in each stroke in the cuff is also different (see appendix figure 2 , the pressure value and oscillation wave during the deflation process of a single balloon in patients with atrial fibrillation; attached image 3 , the pressure value and oscillation wave during the deflation process of the single balloon with frequent premature beats), so it does not strictly conform to the process that the detected oscillation wave signal changes from small to large during the deflation process, and then decreases to a certain extent after increasing to a certain extent. Lead to large errors in blood pressure measurement in patients with frequent premature beats or atrial fibrillation

[0005] The prior art has not yet solved how to accurately locate the pressure in the cuff corresponding to the moment when the measured arterial blood pressure occurs, especially for arrhythmia patients with atrial fibrillation

Images