IEEE Trans Biomed Eng. 2019 Oct;66(10):2897-2905. doi: 10.1109/TBME.2019.2897935. Epub 2019 Feb 6.
Electrodes are used to convert ionic currents to electrical currents in biological systems. Modeling the electrode-electrolyte interface and characterizing the impedance of the interface could help to optimize the performance of the electrode interface to achieve higher signal to noise ratios. Previous work has yielded accurate models for single-element biomedical electrodes. This paper introduces a model for a tripolar concentric ring electrode (TCRE) derived from impedance measurements using electrochemical impedance spectroscopy with a Ten20 electrode impedance matching paste. It is shown that the model serves well to predict the performance of the electrode-electrolyte interface for TCREs as well as standard cup electrodes. In this paper, we also discuss the comparison between the TCRE and the standard cup electrode regarding their impedance characterization and demonstrate the benefit of using TCREs in biomedical applications. We have also conducted auditory evoked potential experiments using both TCRE and standard cup electrodes. The results show that electroencephalography (EEG) recorded from tripolar concentric ring electrodes is beneficial, acquiring the auditory brainstem response with less stimuli with respect to recoding EEG using standard cup electrodes.
电极用于将离子电流转换为生物系统中的电流。对电极-电解质界面进行建模并对界面的阻抗进行特征化，可以帮助优化电极界面的性能，以实现更高的信噪比。以前的工作已经为单元素生物医学电极生成了准确的模型。本文介绍了一种基于三极同心环电极（TCRE）的模型，该模型是通过使用电化学阻抗谱和 Ten20 电极阻抗匹配膏进行阻抗测量得出的。结果表明，该模型很好地预测了 TCRE 和标准杯电极的电极-电解质界面的性能。在本文中，我们还讨论了 TCRE 和标准杯电极在阻抗特性方面的比较，并证明了在生物医学应用中使用 TCRE 的好处。我们还使用 TCRE 和标准杯电极进行了听觉诱发电位实验。结果表明，与使用标准杯电极记录脑电图（EEG）相比，从三极同心环电极记录的脑电（EEG）是有益的，可以用更少的刺激来获取听觉脑干反应。
