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首页> 外文期刊>IEEE Transactions on Instrumentation and Measurement >Comparison of the Carbon Nanofiber-/Fiber- and Silicone-Based Electrodes for Bioimpedance Measurements
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Comparison of the Carbon Nanofiber-/Fiber- and Silicone-Based Electrodes for Bioimpedance Measurements

机译：碳纳米纤维/纤维和有机硅基电极用于生物阻抗测量的比较

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摘要

Electrodes for bioimpedance measurements remain a challenge. In practice, commercially available nonpolarizable silver/silver chloride (Ag/AgCl) gel electrodes prove to be the best option for bioimpedance-based testing. The hydrogel layer reduces the problematic electrode-skin interface impedance, which results in a highly reliable signal. Our workgroup is developing a wearable device that estimates aortic blood pressure from the bioimpedance taken from the wrist area. Understandably, wet electrodes do not suit for a wearable, and there is a need for dry, soft, reusable, and stable electrodes. This study proposes stretchable carbon nanofiber/carbon fiber silicone electrodes as an alternative for cardiac signal measurements with bioimpedance. Five different electrode materials are tested and analyzed: Ag/AgCl gel, Ag/AgCl dry, two carbon and silicone composite materials, and carbon textile. To compare the electrodes & x2019; characteristics, the current through the tissue under the changing pressure, frequency, contact duration, and skin preparation is registered, and the electrode-skin impedance is calculated. The soft and stretchable carbon fiber silicone electrodes proved to have similar response as rigid nonpolarizable Ag/AgCl dry electrodes. Selected methods and proposed instrumentation ensure acceptable reproducibility of the base value and the modulation depth of the measured impedance despite the different electrode materials, large variation of the electrode-skin impedance, and the actual measurement current.
机译：用于生物阻抗测量的电极仍然是一个挑战。实际上，市售的不可极化的银/氯化银（Ag / AgCl）凝胶电极被证明是基于生物阻抗的测试的最佳选择。水凝胶层减少了有问题的电极-皮肤界面阻抗，从而产生了高度可靠的信号。我们的工作组正在开发一种可穿戴设备，该设备可根据从手腕区域获取的生物阻抗来估算主动脉血压。可以理解，湿电极不适合穿戴式使用，因此需要干燥，柔软，可重复使用且稳定的电极。这项研究提出了可伸缩的碳纳米纤维/碳纤维有机硅电极，作为具有生物阻抗的心脏信号测量的替代方法。测试和分析了五种不同的电极材料：Ag / AgCl凝胶，Ag / AgCl干粉，两种碳和有机硅复合材料以及碳纤维织物。比较电极＆x2019;记录在变化的压力，频率，接触持续时间和皮肤准备下通过组织的电流，并计算电极-皮肤阻抗。柔软而可拉伸的碳纤维有机硅电极被证明与刚性非极化Ag / AgCl干电极具有相似的响应。所选择的方法和建议的仪器可确保尽管电极材料不同，电极皮肤阻抗的变化较大以及实际测量电流，但基值和被测阻抗的调制深度仍具有可接受的可重复性。

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