Abstract

Advanced wearable medical devices are widely used for health monitoring, i.e. recording and analyzing signals from human organs. However, the signal quality is influenced significantly by medical electrodes, which became the bottleneck for health monitoring due to unstable impedance under long-term daily usage. Here, a novel monitoring electrode was designed with uniform micro-convex shape to increase the impedance reliability of electrode-skin interface in long-term monitoring and under dynamic conditions, and we set up the electrode-skin interface model to describe the electrode-skin interface and impedance distribution clearly. Furthermore, we investigated how the electrodeposition factors affect the electrode deposition uniformity and electrode resistance. In this study, we compared the monitoring performance among two sets of electrodes: 1) Ag electrodes and Ag/AgCl electrodes, 2) plain Ag/AgCl electrodes, jacquard Ag/AgCl electrodes, and commercial wet electrodes. Specifically, the monitoring performance was quantified by the electrode-skin interface impedance during long-term monitoring, under different dynamic conditions. The optimal electrodeposition process was a ‘small step’ multi-potential method with the 1-1.5-2 V mode. The jacquard Ag/AgCl electrodes presented the best monitoring performance under all three measurement scenarios across four types of electrodes. The results indicated that the proposed electrodes could be used for long-term medical monitoring under daily life activities based on electrical impedance tomography.

摘要

先进的可穿戴医疗设备广泛用于健康监测，即记录和分析来自人体器官的信号。然而，医疗电极对信号质量的影响很大，长期日常使用下阻抗不稳定，成为健康监测的瓶颈。在这里，设计了一种具有均匀微凸形状的新型监测电极，以提高电极-皮肤界面在长期监测和动态条件下的阻抗可靠性，并建立了电极-皮肤界面模型来描述电极-皮肤界面和阻抗分布清晰。此外，我们研究了电沉积因素如何影响电极沉积均匀性和电极电阻。在本研究中，我们比较了两组电极之间的监测性能：/ AgCl 电极、提花 Ag/AgCl 电极和商用湿电极。具体而言，在不同动态条件下，通过长期监测期间的电极-皮肤界面阻抗来量化监测性能。最佳的电沉积过程是1-1.5-2 V 模式的“小步”多电位方法。提花 Ag/AgCl 电极在四种类型的电极的所有三种测量场景下均表现出最佳监测性能。结果表明，所提出的电极可用于基于电阻抗断层扫描的日常生活活动下的长期医学监测。