穿戴式心电及心振信号监测系统的研制

Development of wearable ECG and SCG monitoring system

目的心脏的电活动及机械活动对于研究心脏的生理功能和病理改变具有重要作用,为此本研究研制了一套心电(electrocardiogram,ECG)及心振(seismocardiogram,SCG)信号同步监测系统。方法采用单导联方式进行心电检测,通过测量胸廓皮肤表面的三轴线加速度和三轴角速度来获取心振信号,以ARM Cotex-M3内核的低功耗微处理器STM32作为主控芯片将数据存储至SD卡,或通过低功耗蓝牙将采集的数据发送至手机端上位机并进行数据处理及波形显示。结果对人体进行测量以获取ECG及SCG信号,结果表明系统能够实时采集、传输、显示具有较高信噪比的心电和心振信号,并能实现信号的长期离线记录。结论该系统具有便携、操作简单的特点,能够长期稳定工作,为下一步分析心脏的电活动与机械活动之间的耦联关系奠定了基础。

Objective The electrical properties and mechanical activities of the heart play an important role in the physiological and pathological cardiac research.Therefore,we develop a synchronous monitoring system for electrocardiogram（ECG） and seismocardiogram（SCG）.Methods The detection of ECG is designed by single lead and SCG is obtained by measuring the tri-axial acceleration and the tri-axial angular velocity of the skin surface at chest.A low power consumption microprocessor named STM32 with ARM Cortex-M3 kernel is used to store data to the SD card,or send data to the mobile phone by low-power bluetooth,process data and display waveform.Results ECG and SCG signals of human body are acquired,and the results show that the system can collect,transmit and display the signals of ECG and SCG with high signal-to-noise ratio in real time,and the system can complete the record of signals over a long period of time.Conclusions The monitoring system is portable and easy to operation,and can work steadily for a long time.This work makes the foundation for further analysis of the coupling relationship between the electrical activities and the mechanical activities of the heart.