Patent ID: 7959599

Claim:
In combination with a disposable injector including a housing ( 10 ), a cylinder-piston unit ( 100 )—at least intermittently fillable—arranged thereon, an upstream detachable container adapter ( 200 ) housing a second cylinder-piston unit ( 250 ), the second cylinder-piston unit ( 250 ) at least intermittently fillable, the cylinder-piston unit ( 100 ) including a piston ( 111 ) and an injector-side cylinder ( 101 ) having an interior space ( 110 ), the improvement which comprises: the piston ( 111 ) of the cylinder-piston unit ( 100 ) is movably arranged in a suction- and pressure-controlled manner in the cylinder ( 101 ), the cylinder ( 101 ) sealed at the back thereof in the delivery state; the container adapter ( 200 ) is attached detachably to the disposable injector via a coupling element ( 230 ), in which the container adapter ( 200 ) sits displaceable longitudinally; the container adapter ( 200 ) includes an adapter region ( 201 ) and a container region ( 221 ), an intermediate floor ( 211 ) separates the adaptor region ( 201 ) from the container region ( 221 ), the intermediate floor ( 211 ) having throughhole ( 212 ) passing therethrough; between the intermediate floor ( 211 ) and the cylinder ( 101 ) a needle holder ( 240 ) operatively sits, the cylinder ( 101 ) having a front abutting face ( 103 ) operatively positioned closely adjacent needle holder ( 240 ), the needle holder ( 240 ) having an injection needle ( 242 ) operatively affixed thereto in controllable intermittent fluid communication with the interior space ( 110 ) of the cylinder ( 101 ); the second cylinder-piston unit ( 250 ) is operatively arranged in the container adapter ( 200 ) at the back thereof, an elastic stopper ( 257 ) is in tight sealed relationship with the front of the cylinder-piston unit ( 250 )—in a delivery state—and a second piston ( 261 ) is secured detachably and against running in at the back of the second cylinder-piston unit ( 250 ); the injection needle ( 242 ) has a tip ( 243 ) that terminates operatively sealed in the stopper ( 257 ) prior to activation; the second cylinder-piston unit ( 250 ) includes a second cylinder ( 251 ) having an interior space ( 252 ), the container adapter ( 200 ) is mounted displaceably against the needle holder ( 240 ) in the coupling element ( 230 ), the tip ( 243 ) of the injection needle ( 242 ) is operatively displaceable to pass through stopper ( 257 ) and enter interior space ( 252 ) of the second cylinder ( 251 ), whereby prior to use of the injector for administering to a patient the injection needle ( 242 ) upon displacement provides a temporary fluid communication connection between the interior space ( 110 ) of the injector-side cylinder ( 101 ) and the interior space ( 252 ) of the second cylinder ( 251 ).