Recent strong demand for wearable and implantable devices has been encouraged researchers to develop biocompatible (soft, wet and ionic) devices that can form a smart interface with biological systems. The conventional medical devices for sensing/treatment are "electronically driven dry systems", which is in contrast to the "ionically driven wet biosystem". Therefore, in addition to the improvements in softness and stretchability, the moist and ionic features of electrodes should be considered to realize truly bioconformable interfaces. We have developed original components for such biocompatible devices, including the nanostructured organic electrodes, the stretchable enzyme electrodes, and the porous microneedle arrays. Here I will present our recent achievements in developping the "soft, wet and iontronic devices" that has been realized by combining above uneque components.
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