An endoprosthesis, such as a stent, includes anchoring regions formed of polymer that enhance adherence of a coating, e. In the first current supply period, the duty is set to the upper limit value. For example, power consumption of the routing multiplexers may be reduced by reducing short-circuit currents, reducing leakage currents, limiting voltage swing, and recycling charge within the multiplexer. In addition, or as an alternative, upon a partial or complete expansion thereof, the structure can be controllable to have a plurality of shapes. Importantly, the photoresist is variably exposed so that when developed some of the resist layer remains.