一种基于硬性微针阵列的柔性干电极及其制备方法

A novel fabrication method of flexible dry electrode with rigid microneedles for biopotential monitoring

针对脑机接口系统、生理监护系统中对生物体电信号的高效采集需求,本文提出了一种基于微针阵列柔性干电极制备的新方法。该方法以柔性聚对二甲苯(parylene)为基底,利用parylene包裹固化后的紫外胶作为刚性微针阵列主体。通过该方法制备的柔性干电极更贴合皮肤表面的弯曲和成形,提高了电极与皮肤接触的舒适性。所制备的刚性微针亦可增加电极与皮肤的接触面积,降低电极与皮肤之间的接触阻抗。利用电化学阻抗谱和生物电位记录测试,证实此柔性干电极与传统的银/氯化银(Ag/AgCl)湿电极表现出相似的性能水平。该柔性干电极具有重量轻、柔性高、生物相容性强等优点,有望长期用作可穿戴脑机接口系统的头皮脑电电极。

In this paper,a novel fabrication method of flexible dry electrode with rigid microneedles for brain computer interface and healthcare biopotential monitoring,which is utilizing ultraviolet cured(UV-cured)adhesive as the body of rigid microneedles.The flexible dry electrode is constructed with flexible parylene substrate and rigid UV-cured adhesive microneedls array which enclosed by parylene.The rigid microneedles are contributed to increase electrode-to-skin contact area and reduce contact impedance.The proposed flexible dry electrode can flex and shape itself to the curved skin surface and provide good comfort and electrode-to-skin contact.Equivalent circuit modeling was used to study the electrode-skin interface.Using electrochemical impedance spectroscopy and biopotential recording test,we demonstrate that the proposed flexible dry electrodes exhibit similar performance in comparison with those of conventional Ag/AgCl wet electrodes.The proposed flexible dry electrode,which is light-weight,flexible and well biocompatible,can be taken as a promising bioelectrode for long-term wearable health monitoring systems.