Design And Implementation Of Electronic Blood Pressure Meter Verification Platform Based On Holtek Microcontroller

Blood pressure is a physiological indicator that reflects the status of blood ves-sels and heart function in humans,so the measurement of blood pressure is also re-ceiving much attention.In the non-invasive blood pressure measurement technology,the oscillometric method has the advantages of high noise resistance,stability,and simplicity compared with other methods such as arterial tension method and kosher sound method,and has always been a blood pressure measuring method researched by blood pressure measurement researchers.How to improve the accuracy of the oscil-lometric method for measuring blood pressure is the focus of researchers.At present,research on electronic sphygmomanometers is based on different chips and platforms.There is no ready-made software and hardware platform for use,and there are prob-lems such as decentralized research,complicated circuit layout design,and low sta-bility,which has led to a significant increase in research threshold for sphygmoma-nometers.Therefore,the blood pressure measurement and verification platform is of great significance for blood pressure measurement research personnel to verify the blood pressure measurement algorithm.The main work of this article is as follows:First,this paper designs and implements an electronic sphygmomanometer veri-fication platform based on the Holtek microcontroller.The lower computer adopts Holtek SCM as the core,and combines with external devices such as air pressure sensor,gas release solenoid valve and mini air pump to form the lower hardware sys-tem.The upper computer takes the personal computer as the platform,and sets up the serial port communication,waveform display and data processing modules to form the host computer client software.Second,an improved threshold and amplitude coefficient algorithm is proposed to improve the measurement accuracy of the electronic sphygmomanometer.The method of improving the threshold by gradually approaching the optimal threshold improves the recognition rate of pulse wave peaks and valleys feature points.The improved amplitude coefficient method combined with the method of dynamic nor-malized parameters and accurate calculation of blood pressure value improved the accuracy of measurement results and individual adaptation.Thirdly,the combination of FIR low-pass filtering and differential method in the upper computer is proposed to improve the recognition of pulse wave feature points.At the same time,the real-time display of pulse wave and cuff pressure before and after filtering by the host computer is conducive to the real-time implementation of the oscillometric method for measuring blood pressure and the waveform comparison before and after filtering.After the measurement is completed,the upper computer compares and verifies the measured values uploaded by the lower computer to verify the oscillographic algorithm and detect the measurement results.The traditional mercury sphygmomanometer was used to test and verify the ac-curacy and stability of the electronic sphygmomanometer verification platform.The mean difference between the sphygmomanometer measurement results of the elec-tronic sphygmomanometer verification platform and the mercury sphygmomanometer was(1.061±3.766)mmHg,and the mean difference of the diastolic pressure meas-urement was(1.030±3.486)mmHg.The measurement results show that the electronic sphygmomanometer verification platform has good accuracy and stability and meets the design requirements.