Leicht Lennart, Eilebrecht Benjamin, Weyer Soren, Leonhardt Steffen, Teichmann Daniel
IEEE Trans Biomed Circuits Syst. 2017 Apr;11(2):300-313. doi: 10.1109/TBCAS.2016.2613097. Epub 2017 Jan 25.
Recording biosignals without the need for direct skin contact offers new opportunities for ubiquitous health monitoring. Electrodes with capacitive coupling have been shown to be suitable for the monitoring of electrical potentials on the body surface, in particular ECG. However, due to triboelectric charge generation and motion artifacts, signal and thus diagnostic quality is inferior to galvanic coupling. Active closed-loop humidification of capacitive electrodes is proposed in this work as a new concept to improve signal quality. A capacitive ECG recording system integrated into a common car seat is presented. It can regulate the micro climate at the interface of electrode and patient by actively dispensing water vapour and monitoring humidity in a closed-loop approach. As a regenerative water reservoir, silica gel is used. The system was evaluated with respect to subjective and objective ECG signal quality. Active humidification was found to have a significant positive effect in case of previously poor quality. Also, it had no diminishing effect in case of already good signal quality.
无需直接皮肤接触即可记录生物信号为无处不在的健康监测提供了新机遇。已证明具有电容耦合的电极适用于监测体表电势，尤其是心电图（ECG）。然而，由于摩擦电荷的产生和运动伪影，信号以及诊断质量不如电耦合。本文提出对电容式电极进行主动闭环加湿，作为提高信号质量的新概念。展示了一种集成在普通汽车座椅中的电容式ECG记录系统。它可以通过主动散发水蒸气并以闭环方式监测湿度，来调节电极与患者界面处的微气候。使用硅胶作为可再生储水器。该系统针对主观和客观的ECG信号质量进行了评估。发现在先前质量较差的情况下，主动加湿具有显著的积极效果。此外，在信号质量已经良好的情况下，它也没有负面影响。
