A device implantable on a target of interest of a subject for pacemaker, neuromodulator, and/or defibrillator therapy comprises a wireless power harvesting unit configured to deliver power via resonant inductive coupling to the target tissue for stimulation in a manner that eliminates need for batteries and allows for externalized control without transcutaneous leads. The device relies exclusively on materials that resorb when exposed to biofluids in a time-controlled manner via metabolic action and hydrolysis. The materials and design choices create a thin, flexible, and lightweight form that maintain excellent biocompatibility and stable function throughout a desired period of use. Over a subsequent timeframe following the completion of therapy, the devices disappear completely through natural biological processes. These characteristics and a miniaturized geometry facilitate full implantation into the body to eliminate the need for percutaneous hardware, which thereby minimizes the risk of device-associated infections and dislodgement.