A Wearable Multi-phvsiological Signs Acquisition System Based On Photoplethvsmogram

With the increasing prevalence of chronic diseases and the improvement of people's concern about self-monitoring,multi-vital signs monitoring systems have been attracting more attention.Meanwhile,with the development of large data and intelligent hardware,wearable device has become the focus of health care.It's generally considered to be the next-generation medical monitoring equipment covering users'daily life.In this paper,a wearable signal acquisition system based on photoplethysmography(PPG)signal is presented,which can measure multi-physiological signs.The system consists of a hardware device and an APP on Android smart device.Wearing on the surface of human body,the hardware device is designed to collect and send signals to the Android smart device.The APP has the function of signal reception,waveform display,and data storage.The system can acquire single or dual PPG signals,single-lead ECG signal,and 3-channel accelerometer signals.An experiment is further designed to explore the optimal PPG signal acquisition position for the human throat region.Six candidate sites were selected and the quality of PPG signals were evaluated by four parameters.The finding shows that one site has the highest signal stability and the other part is an excellent choice for respiration rate extraction.At last,this paper builds up the multi-vital signs extraction model for the wearable system,and finally extracts five physiological parameters including pulse rate,respiration rate,blood oxygen saturation(SpO2),systolic pressure and diastolic pressure.The relative error of the five parameters is 0.73%,4.78%,0.44%,7.22%and 7.82%,respectively.Except for the two blood pressure parameters,the first three parameters have achieved an excellent level of error.