Towards emerging EEG applications: a novel printable flexible Ag/AgCl dry electrode array for robust recording of EEG signals at forehead sites
Towards emerging EEG applications: a novel printable flexible Ag/AgCl dry electrode array for robust recording of EEG signals at forehead sites
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面向新兴脑电图应用：新型可打印柔性 Ag/AgCl 干电极阵列，用于在前额部位可靠记录脑电图信号
DOI：
10.1088/1741-2552/ab71ea
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发表时间：
2020-04-01
影响因子：
4
通讯作者：
He, Quanguo
中科院分区：
文献类型：
--
作者：
Li, Guangli;Wu, Jingtao;He, Quanguo
目标。随着基于脑电图的可穿戴医疗设备和脑机接口的快速发展，用于脑电图记录的可靠且用户友好的脑电图传感器，特别是在前额部位，非常令人渴望和具有挑战性。然而，现有的脑电图传感器无法满足要求，因为湿电极需要繁琐的设置和导电膏或凝胶，并且大多数干电极表现出不可接受的高接触阻抗。另外，现有的电极不能有效吸收汗液；汗水会造成相邻电极之间的交叉干扰，甚至短路，尤其是在移动场景或湿热环境中。为了解决这些问题，开发了一种新型可印刷柔性Ag/AgCl干电极阵列，用于前额部位的脑电图采集，主要由丝网印刷Ag/AgCl涂层、导电吸汗海绵和柔性尖齿组成。方法。还建立了评估柔性干电极阵列的系统方法。主要结果。实验结果表明，柔性干电极阵列具有可重复的电极电位、较低的电极-皮肤阻抗和良好的稳定性。此外，可以有效地捕获脑电图信号，其质量可与湿电极相媲美。意义。所有结果都证实了使用所提出的柔性干电极阵列在现实场景中进行额头脑电图记录的可行性，操作快速简便，并且具有自我应用、用户友好和佩戴舒适的优点。
Objectives. With the rapid development of EEG-based wearable healthcare devices and brain-computer interfaces, reliable and user-friendly EEG sensors for EEG recording, especially at forehead sites, are highly desirable and challenging. However, existing EEG sensors cannot meet the requirements, since wet electrodes require tedious setup and conductive pastes or gels, and most dry electrodes show unacceptable high contact impedance. In addition, the existing electrodes cannot absorb sweat effectively; sweat would cause cross-interferences, and even short circuits, between adjacent electrodes, especially in the moving scenarios, or a hot and humid environment. To resolve these problems, a novel printable flexible Ag/AgCl dry electrode array was developed for EEG acquisition at forehead sites, mainly consisting of screen printing the Ag/AgCl coating, conductive sweat-absorbable sponges and flexible tines. Approach. A systematic method was also established to evaluate the flexible dry electrode array. Main results. The experimental results show the flexible dry electrode array has reproducible electrode potential, relatively low electrode-skin impedance, and good stability. Moreover, the EEG signals can be effectively captured with a high quality that is comparable to that of wet electrodes. Significance. All the results confirmed the feasibility of forehead EEG recording in real-world scenarios using the proposed flexible dry electrode array, with a rapid and facile operation as well as the advantages of self-application, user-friendliness and wearer comfort.