穿戴式多通道生理信号采集系统的研究与设计

Research and design of wearable system for multi-channel physiological signal acquisition

随着人类对医疗保障需求的不断提升,长时间连续监测慢性疾病患者的关键生理参数可能为疾病的预防和全面准确的医疗评估提供重要信息。根据人体生理信号的特点提出并设计了一款穿戴式多通道生理信号采集系统。根据生理信号微弱且信噪比低的特点,系统设计了阻抗匹配与共模补偿电路、信号调理放大电路、数模转换与主控制电路,不仅提升了系统共模抑制比,还降低了系统平均功耗。同时将系统的通道结构与增益带宽设计为可调节模式以适应不同类型生理信号的采集。测试结果表明,系统具有低功耗、低噪声、高共模抑制比,能将采集到的生理信号实时存储并传输至终端显示。因此,系统能够满足人体多种生理信号的采集与放大需求以及穿戴式医疗设备的应用需求。

With increasing demand of medical health, continuous monitoring of important physiological parameters of patients with chronic diseases may provide crucial information for clinical assessment. A wearable system for multi-channel physiological signal acquisitions is proposed in this paper. According to the characteristics of weak signal and low signal-to-noise ratio, the proposed system designed the protection circuit, impedance matching circuit, the signal conditioning amplifier circuit, analog-digital converting circuit and the main control circuit for improving common-mode rejection ratio and reducing average power consumption of the system. Meanwhile, the channel structure, gain and bandwidth of the system can be set adjusted for the requirements of different physiological signals. The results show that the system possesses low-power consumption, high common-mode rejection ratio and voltage gain. The signal can be stored and transmitted to the terminal and displayed in real time. Therefore, the proposed signal acquisition system can be applied in the wearable medical field.