Non-invasive blood pressure measuring device

Abstract

The invention provides a non-invasive blood pressure measuring device and a measuring method thereof. In the device, a main machine is provided with a microprocessor connected with an air pressure sensor; a pressurizing band is an inflatable sac-shaped band with air tubes, is connected with the air pressure sensor, is tied on a limb where the flowing of arterial blood of a measured person can be completely blocked after inflation, and is provided with a pulse wave detector which is fixed at a downstream position of the pressurizing band in the arterial blood flowing direction; and the microprocessor processes a plurality of pulse wave amplitudes detected by the pulse wave detector in the gradual increasing process from zero and corresponding pressurizing band pressure thereof in real timeso as to determine the systolic pressure, and processes a plurality of pulse delay time in the process from variation to relative invariant of the delay time between the pulse wave and the corresponding pressure AC signal in real time so as to determine the diastolic pressure. The device converts discontinuous events to continuous measurement, avoids unavoidable possible errors caused by the discontinuity of cardiac impulse, and can accurately and non-invasively measure the systolic pressure and the diastolic pressure in blood pressure.

Description

technical field [0001] The invention relates to blood pressure measurement, in particular to a noninvasive blood pressure measurement device and a measurement method thereof. Background technique [0002] Blood pressure is one of the most important medical basic parameters of the human body. Non-invasive blood pressure measurement is the most commonly used blood pressure inspection method, including the Korotkoff sound auscultation method used by mercury sphygmomanometers and the oscillometric method used by most electronic sphygmomanometers. The Korotkoff sound auscultation method is simple to measure. The disadvantage is that different people may measure different results, sometimes with large differences. The main reasons are: 1) The heart beat is discontinuous, which leads to the unavoidable drop in the height of mercury between two heartbeats. 2) Korotkoff sounds may not be produced when the blood flow is subtle, resulting in the inability to distinguish the appearance...

AI Technical Summary

Problems solved by technology

The Korotkoff sound auscultation method is simple to measure. The disadvantage is that different people may measure different results, sometimes with large differences. The main reasons are: 1) The heart beat is discontinuous, which leads to the unavoidable drop in the height of mercury between two heartbeats. 2) Korotkoff sounds may not be produced when the blood flow is subtle, resulting in the inability to distinguish the appearance time of the characteristic sound when listening to the sound; 3) The response to the change of the mercury column of the mercury manometer is different when listening to the sound, and there is a visual difference in the reading. Error; 4) There are differences in the identification of the appearance time of the characteristic sound when listening to the sound, which is related to the skill and proficiency; 5) The speed of decompression and deflation is easy to deviate from the international standard of 3-5mmHg / second, forming an error

The oscillometric method is a relatively advanced electronic measurement method. Because the systolic and diastolic blood pressure are estimated based on the mean pressure and empirical coefficients, individual differences are relatively large; the heartbeat is discontinuous, which also leads to difficulties in the drop of air bag pressure between two heartbeats. Errors to avoid; body movement, cuff vibration, tracheal vibration, tracheal stiffness, and decompression and deflation speed all affect the accuracy of the measurement

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