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PVDF films-based UWEH. a) PVDF nanofiber film-based UWEH device for an artery micro-robot. Reproduced with permission [95]. Copyright 2011, Elsevier. b) Patterned PVDF film-based UWEH scheme for an implantable active stent. Reproduced with permission [98]. Copyright 2018, Institute of Electrical and Electronics Engineers.
