简单导联的非侵入便携式胎儿心电监护系统研究

提出并验证了一种简单导联方式实现的非侵入便携式胎儿心电监护仪的设计方案:以仪表放大器AD8220为核心,构建了母体胸导心电信号和腹壁混合信号的调理电路;通过AD7658实现A/D转换;然后将所得数字信号送入DSP芯片TMS320F28335,井通过USB通信模块CP2101将得到的心电信号数据传送到PC机。设计出了基于径向基函数的神经网络模块;提取出清晰的胎儿心电信号;调用绘图函数实现信号的实时显示。

Researches on Non-invasive Portable Fetal Electrocardiogram Monitor Based on Simple Lead

A design of the non-invasive portable fetal electrocardiogram monitor is realized by simple leads. Based on the instrumentation amplifier AD8220, a signal conditioning circuit which can realize the acquisition of the electrocardiogram signal of matrix chest and the compos- ite signal of matrix abdominal wall is constructed. The A/D conversion is realized by AD7658. In the circuit, the acquired digital signal is first sent to DSP chip TMS320F28335. Then the electrocardio signal is sent to the PC through the USB communication module CP2101 by the DSP. Under the environment VC ＋ ＋ 6.0,the API function is used to receive the electrocardiogram signal of matrix chest and the composite signal of matrix abdominal wall. A module based on RBFNN is gotten. And the clear fetal electrocardio signal is extracted. At last,the signal is display through the mapping function in real time.