A newly developed home-monitoring system of fetal movement during sleep in pregnant women with high risk pregnancy for reducing their anxiety.

研制了一种高输出功率的小型电容式胎动加速度传感器、胎动加速度测量记录仪和胎动自动分析系统。记录仪（290g, 77mm X 27mm X 140mm）由两个传感器（一个用于胎儿运动，一个用于母体运动），一个生物放大器和一个SD卡驱动器组成。我们可以记录胎儿连续40小时的运动。研究对象为9名给予书面知情同意的正常孕妇（29-39岁）。从妊娠20周到36周，他们每四周记录一次胎儿运动。孕妇睡眠时胎动次数呈周差异，存在个体差异。在胎动自动分析系统中，来自母体的人工信号存在一些问题，尤其是呼吸信号。我们记录了两名高危死产孕妇的胎动情况。其胎动次数分布在胎动范围内的孕妇为低风险孕妇。当她们看到胎儿运动的分析数据时，她们对胎儿的健康感到安全。孕妇可以在夜间自行使用FMAM记录仪轻松记录胎儿运动。FMAM记录仪有望长期监测胎儿运动。有必要收集更多关于正常怀孕受试者的数据，并改进分析系统以排除母体人工制品。

We developed a small capacitive acceleration sensor of fetal movement with high output power, FMAM (Fetal Movement Acceleration Measurement)recorder and an automatic analysis system of fetal movement. The recorder (290g, 77mm X 27mm X 140mm) consists of two sensors (one for fetal movement ; one for maternal movement), a biological amplifier, and an SD card drive. We can record fetal movement during continuous 40 hours.The subjects were nine normal pregnant women (29-39 yr) who gave written informed consent. They recorded fetal movement once every four weeks from 20 to 36 gestation weeks. The number of fetal movement during maternal sleep showed weekly variation with individual differences. In the automatic analysis system of fetal movement, there were a few problems in artifacts coming from the mother, especially her respiration. We could record fetal movement of two pregnant women with high risks who had experienced stillbirth. The number of their fetal movement distributed within a rage of fetal movement of the pregnant women with low risks. When they saw analysis figures of their fetal movement, they felt safe of their fetal well-being.The pregnant women were able to easily record fetal movement using the FMAM recorder at night by themselves. The FMAM recorder is promising for a long term monitoring of fetal movement. It will be necessary to collect more data on normal pregnant subjects and to improve the system of analysis to exclude maternal artifacts.