Wrist type electric sphygmomanometer, and its application method

Abstract

The present invention discloses a wrist electronic sphygmomanometer and its hemadynametry, in which its central processing unit is connected with inflatable pump, PWM generator, comparison voltage generator, voltage comparator, keyboard and display; the wrist band is connected with inflatable pump, electrically-controlled air-discharging vavle and pressure sensor, the described wrist band also isconnected with electrically-controlled air discharging valve, PWM generator and central processing unit, and the described pressure sensor is connected with amplifier, comparison voltage generator, voltage comparator and central processing unit in turn. Said invention also provides its method for measuring blood pressure by using said electronic sphygmomanometer.

Description

technical field [0001] The invention relates to a blood pressure and heart rate measuring device and a measuring method thereof. Background technique [0002] At present, most blood pressure monitors and electronic sphygmomanometers use the oscillometric method to measure blood pressure. The oscillometric blood pressure measurement requires the use of an inflatable cuff or wristband to block the arterial blood flow, and then slowly deflate it. During the deflation process, the gas pressure oscillation wave in the cuff or wristband caused by the pulse of the blood vessel wall is detected. When the pressure in the cuff or wristband is greater than the systolic pressure, the artery is closed, and a small oscillation wave appears in the cuff or wristband due to the impact of the proximal pulse; when the pressure in the cuff or wristband is greater than the mean arterial pressure, the oscillation wave The amplitude gradually increases; when the pres...

AI Technical Summary

Problems solved by technology

If a mechanical deflation valve is used to achieve slow deflation, it is difficult to control the opening of the deflation valve under the condition of a small volume; if the opening is slightly larger, the pressure in the wristband will drop rapidly, and the necessary number of pulsation waveforms cannot be guaranteed. Detection, if the opening is slightly smaller, the deflation rate will decrease, and the measurement time will increase significantly, causing discomfort to the measured object and increasing the possibility of interference introduction

Even if the wrist electronic sphygmomanometer adjusts the opening of the air release valve properly during production, it is difficult to ensure that the opening of the air release valve remains unchanged during long-term use

Compared with the signal of the upper arm, the pulsation signal of the wrist is weak, and the bending of the finger during the measurement is easy to cause small fluctuations in the pressure in the wristband

[0008] In short, if a mechanical deflation valve is used, the non-linear deflation caused by the volume change will affect the correct detection of the pulsation waveform

If an electronically controlled deflation valve is used, although a linear deflation at a substantially constant rate can be achieved, a pulsation waveform that is the same as the heart rate cycle will be superimposed on the linear deflation line

If the timing of controlling the electronically controlled air release valve is inappropriate, such as adjusting the opening of the air release valve when the rising edge of the pulsation waveform appears, the pulsation waveform cannot be detected correctly

The current wrist-type electronic sphygmomanometer fails to combine the correct detection of the pulsation waveform during the deflation process to select the control point of the electronically controlled deflation valve

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