Abstract
The basic design of our portable driving unit follows that of an ordinary and stationary one. But for making it portable, we developed a mechanism which directly controlled the compressor by feeding back the level of the pressure in the air tank. On that concept, we made the first prototype driving unit, which had Ni-Cd battery, A linear compressor, and two flexible air tanks. The size of this driving unit was 150×300×500[mm], and its weight was about 15[Kg]. From in vitro experiment, we knew this unit could generated 6[L/min] blood flow, it could make the same air wave form which the stationary unit made, it could be operated for 2.5 hours under those conditions.
