基于智能手机的无源胎动监测系统

Smartphone-Based Battery-Free System for Fetal Movement Monitoring

无源,无线,低成本,便携式的检测系统在生物医学领域有着巨大的需求。针对监测胎儿重要生理指标胎动信号的问题,结合孕妇胎动的生理特征和可穿戴设备的设计标准,研制了一种基于近场通信(NFC)无源胎动监测系统,NFC技术用于能量收集和传输数据到智能手机,聚偏氟乙烯(PVDF)压电薄膜传感器用于感测胎动信号,设计了滤波放大电路及数字滤波器提取胎动信号参数,研发了针对Android操作系统开发的NFC胎动监测应用程序(APP)。完成了整个系统硬件的调试和软件的设计,实验结果表明,针对胎动监测结果与孕妇主观感受胎动结果基本一致,误差率低于10%。验证了设计系统的可行性和可靠性,满足孕妇长期居家对胎动进行无源监测的要求。

Battery-free,wireless,low-cost,portable biomedical detection systems are in great demand.A fetal movement monitoring system based on Near Field Communication(NFC)is developed by considering the physiological characteristics of pregnant women and the design standards of wearable devices.NFC technology is employed for energy collection and data transmission aiming at smartphone application.A polyvinylidene fluoride(PVDF)piezoelectric thin film sensor,amplifier circuit and digital filter are designed to extract the parameters of the fetal movement signal.In additional,NFC fetal movement monitoring application(APP)for Android operating system is designed.The fetal movement monitoring experiments for pregnant women was implemented,and results show that the measurement error rate is less than 10%comparing to the perception of pregnant women.As a result,this system meets the requirements of long-term battery-free monitoring of fetal movement for pregnant women.