Design And Implementation Of Wearable Multi-sensor Physiological Monitoring Device

The aggravation of aging and social pressure make cardiovascular disease an important social problem: in the elderly population,most people suffer from different types of cardiovascular diseases,such as hypertension;middle-aged people,some people with cardiovascular diseases do not know their history of illness;in addition,some cardiovascular diseases can only detect pathological features such as paroxysmal premature beats when they are onset.Therefore,designing a set of long-term cardiac monitoring equipment is of great significance for the prevention and treatment of cardiovascular diseases.The wearable cardiac monitoring devices currently on the market have single monitoring parameters.Their monitoring content is of little value to users.And there are motion artifacts interference during the ECG monitoring process.Therefore,this article designed and implemented a set of wearable multi-sensing physiological monitoring device.It can collect 3 kinds of physiological signals in real time,including ECG,heart sounds and body temperature and send data to the terminal display processing through BLE4.0 wireless transmission protocol.The display terminal can display 3 physiological signal waveforms and related medical parameters to the user in real time.The main research contents of this article are as follows:1)The device is designed in the form of multiple nodes: heart sound node,ECG body temperature node and terminal node.The heart sound node and the ECG body temperature node are sensing nodes.The former is responsible for collecting heart sound signals,the latter collecting ECG,inertia and body temperature signals.The terminal nodes are display and processing nodes.Multiple nodes are connected by BLE4.0 protocol networking.2)On the hardware,the signal acquisition circuit,main control circuit and power management circuit are designed in the two sensor nodes.In the signal acquisition circuit,ECG,inertia,and body temperature signal acquisition circuits are designed with integrated chips;the heart sound acquisition circuit is designed with discrete components,including signal amplification and hardware filter circuits.3)On the software,the signal acquisition driver,necessary service files in Bluetooth transmission and low power management scheme are designed in the two sensor nodes.Based on the signal anti-interference and low power consumption requirements,adaptive LMS filters and median filters are designed for ECG and body temperature signals in the ECG temperature node,respectively.In the terminal node,Bluetooth Dongle data forwarding program,host computer display and processing interface are designed.Among them,the host computer is designed based on Qt5.0,used to display,store and process three kinds of physiological signals.The signal processing part uses the Pan Tompkins algorithm and the normalized average Shannon energy algorithm to extract ECG and heart sound signal characteristic parameters.4)Finally,the device is tested for performance according to the design content,including: sensor node hardware electrical performance,physiological signal collection quality and accuracy,terminal node characteristic waveform recognition accuracy and device wireless transmission performance.The final experiment shows that the device designed in this paper has low power consumption,can monitor ECG,heart sound and body temperature signals in real time,which have strong anti-interference.It can provide users with multiple medical parameter calculation results.