The syringe assembly is a barrel for containing one or more types of drugs, the barrel having a front outlet, wherein the front outlet allows the release of the one or more types of drugs from the barrel through the outlet. A first stopper disposed in the barrel and movable in the axial direction in the barrel, and positioned in front of the first stopper in the axial direction in the barrel. A first stopper defining a first space and a second space located axially rearward of the first stopper in the barrel. The first stopper includes a two-way valve that is movable between a sealed configuration and an open configuration to selectively fluidly communicate the first space with the second space. The two-way valve is movable from the sealed configuration to the open configuration by increasing the fluid pressure in one of the first and second spaces. The syringe assembly is a second stopper that is disposed axially rearward of the first stopper in the barrel and is axially movable in the barrel, and is liquid-tight at the rear end of the second space. A second stopper providing a seal is additionally provided. The syringe assembly is a first plunger rod connected to the first stopper and extending axially rearwardly through the second stopper, the second stopper being attached to the first plunger rod. A first plunger rod is further provided that is in sealing engagement and adapted to allow axial sliding of the first plunger rod through the second stopper. The first plunger rod moves the first stopper in the axial direction, pressurizes either the first space or the second space, thereby moving the two-way valve to the open configuration, The second space and the second space are movable in the axial direction so as to be fluidly connected to each other.注射器アセンブリは、一種または多種の薬剤を含むためのバレルであって、バレルは、前出口を有しており、前出口は、前記バレルから前記出口を通る前記一種または多種の薬剤の放出を可能にするようになっているバレルと、バレル内に配置され、バレル内において軸方向に移動可能になっている第１のストッパであって、バレル内において第１のストッパの軸方向前方に位置する第１の空間およびバレル内において第１のストッパの軸方向後方に位置する第２の空間を画定して
