Wearable ECG Monitoring System For Dynamic Environment

With the development of social economy and the continuous improvement of living standards,people’s lifestyles have undergone profound changes.While enjoying a higher material living standard,people are under tremendous work intensity and life pressure,leading to cardiovascular diseases.The morbidity rate continues to rise,and it is necessary for social medical care to gradually shift from a disease-centered model to a prevention-based,early diagnosis,and early treatment model.Traditional,immovable large-scale medical care equipment has also gradually transformed into small portable health monitoring equipment that can meet the needs of the general population,enabling wearable ECG intelligent monitoring.At present,some portable ECG monitoring systems have poor anti-interference ability,and there is a problem that the motion artifact noise is too large in a dynamic environment,resulting in a baseline offset or even distortion of the ECG signal,and the frequency of the motion artifact noise and the ECG signal The frequency overlap makes it impossible to eliminate it with a simple filter circuit and digital filter algorithm.In response to this common problem,this paper has designed a wearable ECG monitoring system suitable for families in a dynamic environment,which can be achieved by adaptively eliminating motion artifacts without affecting the user’s daily activities.Real-time monitoring of the human body’s ECG signals in a dynamic environment.Firstly,aiming at the common ECG monitoring technology and the shortcomings of wearable ECG monitoring in the current market,it is clear that the user’s ECG signal and electrode-skin impedance change signal are used as system monitoring signals.Analyzed the generation mechanism of ECG signal and electrode-skin impedance change signal respectively,and put forward a monitoring scheme.Under the requirements of dynamic environment,wearable,convenience,comfort,etc.,the ECG signal for dynamic environment was designed.Monitoring program.Then completed the hardware and software design of the signal node.Among them,the signal node mainly integrates the ECG signal acquisition module,the electrode-skin impedance change signal acquisition module,the Bluetooth module,and the microcontroller module,and designs the charge and discharge circuit powered by the USB interface;the signal node pair is realized through the embedded software design The data collection and control of each module;the shell of the signal node is designed in combination with 3D printing technology,and finally the construction of the hardware platform of the entire system is realized.Finally,the client monitoring software design and system function verification are completed.Based on the Qt platform,the monitoring program on the PC side is designed,which realizes the functions of data transmission with the signal node,realtime display of the signal and data storage,and the multi-threaded software design method is used to calculate the real-time heart rate of the ECG signal and pass the realtime heart rate through The chart displays and displays the average heart rate in real time.Then the system functionality was verified.First,stress was applied to electrode RA and electrode LA,respectively,and the collected ECG signal and electrode-skin impedance signal were used as input signal and reference signal,respectively,and then filtered out by adaptive filtering algorithm.Movement artifacts have obtained a stable baseline ECG signal,and the test verifies the functionality of the system.Finally,the system was tested in the actual dynamic environment(under chest expansion exercise,squat exercise and hand raising exercise).The verification results show that the system can effectively eliminate the motion artifacts in the actual ECG signal,and obtain the baseline Stable and clear ECG signal.