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首页> 外文期刊>Biomedical Circuits and Systems, IEEE Transactions on >A Thorax Simulator for Complex Dynamic Bioimpedance Measurements With Textile Electrodes
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A Thorax Simulator for Complex Dynamic Bioimpedance Measurements With Textile Electrodes

机译：带有纺织电极的复杂动态生物阻抗测量的胸腔模拟器

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摘要

Bioimpedance measurements on the human thorax are suitable for assessment of body composition or hemodynamic parameters, such as stroke volume; they are non-invasive, easy in application and inexpensive. When targeting personal healthcare scenarios, the technology can be integrated into textiles to increase ease, comfort and coverage of measurements. Bioimpedance is generally measured using two electrodes injecting low alternating currents (0.5–10 mA) and two additional electrodes to measure the corresponding voltage drop. The impedance is measured either spectroscopically (bioimpedance spectroscopy, BIS) between 5 kHz and 1 MHz or continuously at a fixed frequency around 100 kHz (impedance cardiography, ICG). A thorax simulator is being developed for testing and calibration of bioimpedance devices and other new developments. For the first time, it is possible to mimic the complete time-variant properties of the thorax during an impedance measurement. This includes the dynamic real part and dynamic imaginary part of the impedance with a peak-to-peak value of 0.2 and an adjustable base impedance . Another novelty is adjustable complex electrode-skin contact impedances for up to 8 electrodes to evaluate bioimpedance devices in combination with textile electrodes. In addition, an electrocardiographic signal is provided for cardiographic measurements which is used in ICG devices. This provides the possibility to generate physiologic impedance changes, and in combination with an ECG, all parameters of interest such as stroke volume (SV), pre-ejection period (PEP) or extracellular resistance can be simulated. The speed of all dynamic signals can be altered. The simulator was successfully tested wit- commercially available BIS and ICG devices and the preset signals are measured with high correlation .
机译：对人胸部的生物阻抗测量适合评估人体成分或血液动力学参数，例如中风量；它们是非侵入性的，易于应用且价格便宜。在针对个人医疗保健场景时，可以将该技术集成到纺织品中以增加便利性，舒适性和测量范围。通常使用两个注入低交流电（0.5-10 mA）的电极和两个附加电极来测量相应的电压降来测量生物阻抗。可以在5 kHz和1 MHz之间以光谱法（生物阻抗光谱法，BIS）或以100 kHz左右的固定频率连续测量阻抗（阻抗心动图，ICG）。正在开发一个胸部模拟器来测试和校准生物阻抗设备以及其他新的发展。首次有可能模拟阻抗测量过程中胸部的完整时变特性。这包括阻抗的动态实部和动态虚部，其峰峰值为0.2，并且可调节基础阻抗。另一个新颖之处是可调节的复合电极-皮肤接触阻抗，最多可用于8个电极，以结合纺织品电极评估生物阻抗设备。另外，提供了用于心电图测量的心电图信号，该信号用于ICG设备。这提供了产生生理阻抗变化的可能性，并且与ECG结合使用，可以模拟所有感兴趣的参数，例如中风量（SV），射血前期（PEP）或细胞外阻力。所有动态信号的速度都可以更改。该模拟器已在商用BIS和ICG设备上成功进行了测试，并且以高度相关性对预设信号进行了测量。

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