Design And Implementation Of ECG And Blood Oxygen Saturation Monitoring Terminal

According to the relevant agencies, cardiovascular diseases become a threat to human health, 1/3 disease deaths are caused by cardiovascular disease around the world every year. With the continuous improvement of people's quality of life, the prevention and detection of cardiovascular disease has become increasingly important. However, traditional medical monitors are only for application in clinic, but are not suitable for the community hospital and home. The ECG and PPG signals are the body's two important physiological parameters, therefore, designing ECG and PPG signals monitor to meet the family and community hospitals which analyze ECG and PPG signals with auxiliary means is of great application value and social benefits.The main work of this paper is to design the ECG and blood oxygen saturation monitoring terminal. The monitoring terminal is composed of central control unit(MCU)?ECG acquisition front-end module, blood oxygen acquisition front-end module, data storage module, transmission module, real-time display module. The TI's chip ADS1298 R is used as the ECG signal acquisition analog front-end. The TI's chip AFE4490 is used as the Blood oxygen analog front-end. Compared with the traditional discrete components, the proposed scheme greatly simplifies the circuit design, effectively solves the large number of noise caused by discrete components, and greatly reduces the power consumption and reduces the size of the device. The ultra low power consumption 16 bit single chip MSP430F6659 is used as the MCU. The chip has 100 pins and rich interface, can provide 25 M system clock, operate and control the whole system. The transmission interface includes USB interface and Ethernet interface. The 7-inch LCD color display screen is used to display the real-time results and waveforms. The MicroSD card is used to store the collected data of monitor terminal.According to this scheme, the hardware of monitoring terminal of each module is designed, and then the overall software process is designed and each module of the software is realized. The calibration curve of R-SpO2 is calibrated with the blood oxygen simulation instrument, and with a high accuracy. Considering the application in embedded system, the method improved median filter and sliding average filter are used to reduce the noise. The second order difference threshold algorithm is used to detect and analyze the characteristics of ECG waveform and the peaks and troughs of PPG signal. The ECG and blood oxygen saturation monitoring terminal designed in this paper can complete the function of ECG monitoring and blood oxygen saturation measurement, which can be easily applied in the field of family and community monitoring, mobile monitoring and remote monitoring.