Pressure control circuit and control method for blood pressure measurement

Abstract

The invention relates to a pressure control circuit and control method for blood pressure measurement. The control circuit comprises a pressure sensor, a signal processing circuit, a microcontroller, a PWM (pulse-width modulation) controller and a peristaltic pump. The pressure sensor is connected with the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the microcontroller, the output end of the microcontroller is connected with the input end of the PWM controller, and the output end of the PWM controller is connected with the peristaltic pump; the pressure sensor collects mixed signals of pressure and pulse waves, the signal processing circuit receives the mixed signals and has the same processed to acquire pressure feedback signals and pulse wave signals, the pressure feedback signals and the pulse wave signals are sent to the microcontroller, and the microcontroller sends control signals to the PWM controller after being subjected to comparison and PI adjustment, the PWM controllers sends out the PWM signals with the corresponding pulse width to complete control of the peristaltic pump. Compared with the prior art, the pressure control circuit and control method has the advantages that the pressure can be effectively controlled to change uniformly during measurement, and measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a pressure control circuit and control method for blood pressure measurement. Background technique [0002] Electronic sphygmomanometer in the blood pressure measurement process, in order to obtain accurate blood pressure measurement value, it is necessary to ensure that the pulse wave information at each pressure point is uniform, that is, the pressure changes at a uniform speed during the entire measurement process. In the traditional step-down blood pressure measuring machine measurement, the uniform deflation valve plays a key role. In the measurement of the step-up blood pressure measuring machine, the measurement method is the same as the step-down measurement principle, but in the process of step-up, if the pressure is required to change at a constant speed, the non-linear change of the speed of the inflator must be controlled. If the control is not accurate enoug...

AI Technical Summary

Problems solved by technology

If the control is not accurate enough, the air flow will be unstable during the boosting process, the pressure change speed will be uneven, and the measurement results will easily cause deviations.

At present, electronic sphygmomanometers have gradually replaced traditional mercury column sphygmomanometers, and electronic sphygmomanometers that use air pumps for pressure control have limitations in the accuracy of air pump control, and at the same time, the air pump needs to be additionally equipped with an air release valve for air release.

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