A medical balloon composed of a micro-composite material which provides for radial expansion of a balloon to a predetermined extent, but which has minimal longitudinal growing during balloon inflation. The battery is for energizing the motor. In addition, platen rollers are also deformed by respective thermal heads. A plurality of the virtual access channels are cacheable virtual access channels, each of which includes a channel row cache memory for storing one or more cache entries and a channel row address register for storing corresponding cache address entries.