An implantable electric device comprising: a deployable round structure initially in a cramped state and adapted to be expanded into a deployed state, with at least one of a plurality of coils provided about the structure; a power source; and an electric circuitry for generating alternating currents in said at least one of the plurality of coils to generate an alternating electromagnetic field within the structure. In some embodiments of the invention it serves as a motor, and in some embodiments it serves to enhance blood flow within a patient's vasculature.