| 摘要 |
PURPOSE:To stably obtain a pressurized physiological saline solution of desired pressure by calculating a pressure change ratio until the pressure detected by a pressure detector reaches a preset upper limit pressure and shutting off the supply of the high pressure gas, which is supplied to a pressure container before liquid pressure reaches the upper limit pressure, on the basis of said change ratio. CONSTITUTION:A pressure control valve 5 is opened in starting use, and the pressure in a pressure container 9 and that in a receiving container 8 gradually rise to reach predetermined pressure. The pressure change at this time is monitored and detected by a pressure detector 7 and the detected pressure is operationally processes by a controller 21 to obtain a pressure rising rate RP. A critical value RS is preset with respect to said pressure rising rate to be compared with the pressure rising ratio RP. As a result of comparison, at the time of RP>RS, the offset value RI to a pressure upper value PU is calculated on the basis of a definite calculation standard and a signal is outputted from the controller 21 in order to close the pressure control valve 5 at the point of time when the detected pressure PR reaches (PU-PI), that is, before said pressure PR reaches the pressure upper limit value PU. |
