基于充气板的呼吸监护仪设计与实现

Design and Realization of Respiratory Monitor Based on Air-mattress

根据非接触式家庭生理监护的要求,设计了一种基于充气板的呼吸监护系统。系统采用压阻式压力传感器来采集呼吸信号,通过平衡管并进行差压测量来提高信号采集部分的信噪比;针对呼吸信号弱、噪声强、动态范围大等特点,设计信号调理电路和幅度的自动调整算法;在上位机利用Visual C++设计了睡眠中呼吸状态判别和呼吸率提取算法。实验结果表明,该系统的信噪比最高可达22 dB,呼吸率检测误差均在10%以内,无超过15s呼吸暂停漏报情况,能够实现呼吸率检测和呼吸暂停监护的功能。

According to the non-contact request in home physiological monitoring,a respiratory monitor system based on an air-mattress is designed.In this system,the respiration signal is collected by a piezoresistive pressure transducer,with SNR of signal acquisition improved by the differential pressure measurement and balancing tube.Besides,a productive module for signal condition and amplitude regulation is designed for the weak signal with high noise and wide dynamic range.Algo-rithms for the extraction of respiratory status and respiration rate are achieved on a PC using Visual C ＋＋.Experiments show that the SNR is up to 22dB,with error of respiration rate less than 10%,and no sleep apnea for 15s detected.The de-signed system can achieve the function of respiration rate detection and sleep apnea monitoring.