生物组织分布阻抗测量装置的研制

An Instrument for the Measurement of Intra-and Extra-cellular Fluid Distribution by Electrical Bio-impedance Method

根据Ｃｏｌｅ－Ｃｏｌｅ阻抗圆图、生物组织ＲＣ三元件等效电路模型和频散理论，成功地设计了一套用于测量肢体和脑神经细胞内外液分布阻抗的测量装置。整个测量装置在８０３１单片机的控制下，能够自动实现频率切换、数据采集和处理、结果显示和打印等功能，并采用软件方法实现自调零和系统校正。为确保被测者的安全，本装置还采用光耦合器件和ＤＣ／ＤＣ变换器进行电隔离，激励电流幅值调在１００μＡ附近。

Based on Cole-Cole impedance locus plot, RC three elements equivalent circuit model and dispersion theory, an impedance measuring instrument for measuring the intra-and extra-cellular fluid distribution of human limbs and blain nerves has been designed. The whole system is controlled by 8031 single-chip microcomputer. It can automatically realize frequency change, deta collecting and processing , result displaying and printing. The software method is adopted for zero-compensation and system calibration. To ensure the safety, the optical couplers and DC/DC convertor are adopted for electrical isolation. The exiting current is in the order of 100 μA.