一种基于胸阻抗法的心功能无创检测分析仪

目的为了经济、快捷、全面地实现心功能的无创检测,基于胸阻抗法成功研发了一种心功能无创检测分析仪,可方便地实现胸阻抗信号、心电信号、心音信号的同步检测分析,从而实现对患者心功能的无创综合评价。该方法无毒无创,操作简单,完全可以实现家用化普及。方法本文首先描述了系统的硬件模块构成,说明了胸阻抗信号的采集过程。其次,使用FPGA芯片与DDS芯片构成系统的控制与信号发生核心,指出了恒流源的精度等性能指标。再次,指出了胸阻抗信号处理的要点,运用互感原理实现干扰信号的隔离。最后,介绍了仪器软件功能,并展示了仪器软件实测结果。结果通过临床试验,对胸阻抗法与超声多普勒法检测的数据结果进行t检验,结果表明二者具有一致性。结论由于采用了先进的特征点判别方法,该设备具有较高的临床检测精度和较好的临床适用性,可满足临床心功能无创检测和评估的要求。

A kind of heart function analytical device based on impedance cardiography method

Objective A kind of heart function analytical device is invented based on impedance cardiography method to detect heart function economically, fast and comprehensively? The device can detect and analyze ICG, ECG and PCG signals synchronously, so comprehensive noninvasive assessment of heart function in patients can be achieved? Methods This article introduces the system and main hardware modules of the device, describes the process of ICG acquisition? FPGA and DDS are used as hardware core and performance indices of the device are pointed out? Key points of signal processing are presented and the electromagnetic principle of mutual inductance is used in this part? Results By analyzing and comparing clinical data, this article indicates that the device can gain more accurate clinical test data and has better clinical applicability? Conclusions Because of its advanced feature points’ extraction method, this device meets the requirements of clinical examination and assessment for heart function.