Patients controlled liquid administration device (10) includes reciprocating pump (12), and there is the one outlet that can be connected with pressurized liquid drug source may be connected to patient for it. Fixture (38) rotates between closure and open position, blocks respectively and allows to pump and flows out. One end for being in contact on plunger (48) with the removable wall of pump and pump (26) and position can raised and reduced. Button (50) moves between piston extended position and pressing position, and has a flange, joining jig, when button motion to its depressed position simultaneously mobile fixture to its open position. Compressed spring (52) is arranged between plunger and button. Spring catch (60) engages the button of pawl (50), when button motion to its depressed position and remains there, until button is released through button of that the release spring pin in lock release plunger (62) from retainer, when plunger (48) is moved to its reduction position. Removable lug allows to be easy, the pump of quick start is by being maintained at its open position for the clip, and unrelated with the position of button, and button is maintained at its depressed position, and unrelated with the position of plunger completes.
