A standard-sized bicycle includes a main frame, a rear drive wheel and a rowing mechanism. Among these embodiments are methods of manufacturing an implantable medical device by purifying a polymer with a fluid capable of swelling the polymer, and subsequently coating a device with the purified polymer or fabricating a device from the purified polymer. Overall yield and productivity of the unsaturated carboxylic improves for such a process. One or more processors are configured to use a Phase-Shifted Carrier Pulse Width Modulation scheme to operate the bridge circuits in order to produce steps for a step wave Alternating Current output from the secondary windings.