Medicinal syringe with piston stopper withdrawal and rotation-limiting means

The syringe is formed according to DIN ISO 11040 and has a syringe barrel ( 1 ) with a syringe head ( 1 a ) formed on one end and a grip plate ( 4 ) formed at the other open end. An elastomeric piston stopper ( 6 ) is insertable in this open end, which is movable back and forth and which has a cruciform-cross-sectioned piston rod ( 7 ) screwed into it. A stop element, which reduces the interior diameter of the syringe barrel, is provided at the open end of the syringe barrel to perform a back-stop function, i.e. to prevent unintended withdrawal of the piston stopper. For this purpose a plastic part ( 2 ) connected to the grip plate ( 4 ) is provided with snap catches ( 3 ), which snap onto the inner side of the syringe barrel ( 1 ). These snap-catches ( 3 ) prevent the piston rod ( 7 ) from being rotated out of the piston stopper and the piston stopper ( 6 ) from being withdrawn from the syringe barrel. At the same time the finger support is enlarged.