Research And Development Of Wearable Detection Modules For Mobile Health

The detection of physiological parameters has a momentous significance to the development of modern medicine. Long-term medical attention can form a valuable medical data. Meanwhile, the value of motion data detection in sports training, medical care and rehabilitation medicine is gradually discovered and applied in recent years. The whole healthcare industry has approved of wearable devices and mobile medical solutions higher than any time after the determination of " Internet +" strategic, which promotes the formation of "preventive treatment of disease".In this paper, we discussed and analyzed the application of wearable devices in the field of mobile health. We designed physiological parameters monitoring modules with low-power and high-precision sensors, and a motion detection module based on nine-axis gyroscope, both of which are according to embedded device development process of Unified Modeling Language(UML). Respectively, we used Bluetooth Low Energy(BLE) technology for short distance communication, and cellular networks for telecommunications in the modules.In this paper, we designed electrocardiogram(ECG), temperature and blood oxygen saturation monitoring modules. The analog front-end chips of physiological parameters have features of low-power consumption and high integration, contain not only analog to digital converter with high performance inside, but also special filter aiming at ECG, pulse wave and other weak signals. Thus is suitable for the wearable modules design requirements. The wearable motion data acquisition module used nine-axis inertial sensor with high sensitivity and small volume. The nine-axis sensor has an acceleration sensor, an angular velocity sensor and a magnetic sensor as its three internal triaxia sensors. Kalman filter and dynamic attitude estimation algorithms can be completed by the inner controller. The quaternion motion data were transferred to MCU and packaged. MCU transmitted the processed data to host computer transparently through Bluetooth serial port. After calibration initialization in the world coordinate system and the relative coordinate system, the extremity movement in threedimensional space can be demonstrated and the body range of motion can be calculated with the data including magnetic parameters. The detection system includes a safe and efficient power management module, and uses BLE.We designed a ECG vest, which can measure user’s ECG data on real time. We also integrated temperature detection function cleverly in the ear clip type oxygen probe. After our creative work, the nine-axis gyroscope motion detection equipment can be used not only for sleep monitoring and falling alarm, but also for rehabilitation training. We tested that our devices could achieve a high detection accuracy with lower power consumption through the comparison with similar products. The paper introduced the whole development process of wearable detection modules systematically. As the hardware foundation of mobile health system, the development provides a certain reference value in related fields.