A medical device is arranged to provide adjustable, user-controlled, perpendicular compression to soft tissues. When operated, the plurality of fan motors provided in the refrigerator is sequentially operated at certain delay times, to thus improve operation efficiency of the plurality of fan motors. The excitation frequency is incrementally changed. The page buffer is adopted to apply first and second voltages to the bit lines connected to the memory cell transistors in which the \u201c0\u201d data and \u201c1\u201d data is to be programmed respectively, when the selection transistor is turned on, in a write operation.