[intelligent development] scheme design and hardware development of sphygmomanometer

　　 Working principle of electronic sphygmomanometer
　　
　　 Electronic sphygmomanometer is a medical device that uses modern electronic technology and the principle of indirect blood pressure measurement to measure blood pressure , The principle of Oscillographic method is mostly used to measure blood pressure . The household portable sphygmomanometer mainly consists of MCU、 Display panel 、 Air pressure sensor 、 Cuff 、 Air pump 、 Battery, etc , Its working principle is based on the fluctuation of arterial blood pressure during decompression , Calculate systolic blood pressure 、 diastolic pressure 、 mean arterial pressure .
　　
　　 Electronic sphygmomanometer scheme
　　
　　 The whole scheme of electronic sphygmomanometer adopts SIC32F911RET6 As a control chip for blood pressure measurement and display of the whole machine , Through the development and design of single chip microcomputer program , The main component structure is the sensor 、 Air pump 、 Blocking ties 、LCD Display screen and measuring circuit . Through its own temperature compensation SIC160 The pressure sensor monitors the fluctuation of arterial blood pressure , Convert to frequency , Processed by filtering algorithm , Calculate systolic blood pressure 、 diastolic pressure 、 mean arterial pressure , And drive the LCD panel to display the blood pressure value and pulse number , Automatic voice broadcast measurement results .
　　
　　 Program features
　　
　　1. Data accuracy ： Filtering algorithm is adopted , Accurately calculate systolic and diastolic blood pressure . Display accuracy 1mmHg(0.133Kpa);
　　
　　2. Intelligent pressurization ： Built in high-precision digital air pressure sensor , Accurately control the inflation and deflation of the pressure pulse belt , Effectively eliminate measurement artifacts ;
　　
　　3. Voice Announcements ： Support volume adjustment , It can automatically broadcast the measurement results in the whole process ;
　　
　　4. A big screen ： Clearer display , The algorithm has been extensively tested , A more stable , Storage 100 Group historical memory ;
　　
　　5. Rich interface elements ： It can display the real-time change of blood pressure 、 High and low voltage warning, brightness adjustment and other user interface display effects ;
　　
　　6. Rechargeable ： Built in rechargeable lithium battery , collocation Mini USB The charging interface , Easy to charge , There is no need to replace the battery ;
　　
　　7.. Blood pressure measurement range ：0~ To 299mmHg（0~ To 39.9kPa）, Pulse measurement range （40~200 Time / minute ）;
　　
　　8. Communication mode ： bluetooth 、WiFi、 Serial port communication uploads data to the cloud APP.
　　
　　 Electronic sphygmomanometer measurement method
　　
　　 Take a break first 15 minute .
　　
　　 When measuring blood pressure , quiet 、 Sit comfortably on a seat with a back .
　　
　　 Naturally separate your legs , Relax naturally .
　　
　　 then , Take off the upper arm sleeve , The air bag is fastened to the upper arm , Its “△” The mark should be at the brachial artery .
　　
　　 The lower edge of the bag should be on the elbow socket 2 to 3 Cm , The upper arm should be at the same level as the heart .
　　
　　 Keep warm in winter , Prevent trembling .
　　
　　 Upper arm perimeridians >32 centimeter , Should be replaced 16 centimeter ×65 Cm large air bag . Automatic pressure measurement process , The patient cannot move , Otherwise, false waves will appear , Fail the pressure measurement .
　　
　　 measurement 2 to 3 Time , Average. .
　　
　　 There should be an interval between the two measurements 3 Minutes or more , And the parts 、 Be in the same position .