Body-Temperature-Responsive Balloon Actuator for Adaptive In-Ear Microneedle Electrode Deployment

Le résumé fourni par la source

Conventional in-ear electrodes face challenges such as inconsistent skin contact, motion artifacts, and discomfort, limiting their reliability in dynamic conditions. To overcome these limitations, this study presents a body-temperature responsive in-ear balloon actuator (BBA) based on liquid-to-vapor phase change, integrated with silver microneedle electrodes for stable electrophysiological monitoring. The dual-layer balloon structure encapsulates a phase-change fluid core, expanding at 36–37°C to ensure conformal skin contact while minimizing motion artifacts and mechanical pressure. Among 3 tested designs, the dual-material design proved optimal, achieving a peak insertion force of 0.05 N and maintaining impedance fluctuations below 5%. A wearable system was further validated through dynamic tests, demonstrating a 20% reduction in motion artifacts compared to conventional electrodes. These findings highlight the actuator’s potential for stable and comfortable wearable electrophysiological monitoring.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.