| 摘要 |
A drive unit for medical equipment in which, when a pressure detected by a conduit pressure sensor (15) becomes lower than a predetermined value, a first solenoid valve (63) is closed and a second solenoid valve (68) is opened, so that a conduit (18) is replenished with a gas from a secondary gas tank (64), and the amount of gas to be supplied is calculated based upon a change in the pressure detected by a tank pressure sensor (65). In using the equipment, the leakage of gas under normal condition can be easily distinguished from the leakage of gas under abnormal condition. Desirably, the drive unit has a gas supply device (60) which detects the pressure in the conduit (18) at a timing of changing a balloon (22) from the contracted state over to the inflated state and replenishes the conduit (18) with the gas so that the detected pressure will reach a predetermined value, and further has a control unit (10b) for changing the desired value. Preferably, when the interval between inflation and contraction of the balloon (22) is short, the inflation drive is stopped for one pulse, the pressure in the balloon is stabilized and is then detected, and the gas is replenished based upon this pressure. Preferably, the drive unit has a pressure transmission device having vent grooves (52, 54) to permit the residual fluid existing in the intimate contact between a diaphragm (46) and a first inner surface (49) or a second inner surface (51) to escape to an input port (48) or to an output port (50).
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