Why the study?
Does active closed-loop humidification of capacitive electrodes improve ECG signal quality in a car seat integrated system?
Does active closed-loop humidification of capacitive electrodes improve ECG signal quality in a car seat integrated system?
Active closed-loop humidification improves the signal quality of capacitive ECG measurements, potentially enhancing ubiquitous health monitoring without direct skin contact.
May enable reliable in-vehicle capacitive ECG; leaves open translation to clinical arrhythmia detection or other settings.
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.
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Leicht et al. (2017) studied this question.
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