Patent ID: 9364395
Filing Date: 2016-06-14
CPC Classification: A61J,A61M

Claim Text:
1. A cartridge syringe ( 1 ) with a longitudinal opening ( 2 ) for inserting a cartridge ( 3 ), the cartridge ( 3 ) having an ampule cylinder ( 6 ) filled with a medication and the cylinder being closed at a front end by a piercing membrane ( 7 ) and at a rear end by a stopper ( 8 ), the stopper ( 8 ) having a blind hole ( 9 ), and a displaceably guided ram ( 13 ) at the rear end of a receptacle housing of the syringe ( 1 ), configured for pressing the stopper ( 8 ) for injecting the medication in the ampule cylinder ( 6 ) after piercing the piercing membrane ( 7 ), wherein a rear end of the ram ( 13 ) is provided with an actuating element ( 15 ) and a front end of the ram ( 13 ) is configured to be attached in the blind hole ( 9 ) of the stopper ( 8 ) for aspiration, the syringe characterized in that the ram ( 13 ) has an outer sleeve ( 14 ) in which a core ( 16 ) is disposed, wherein, at the rear end of the receptacle housing ( 1 ), the outer sleeve ( 14 ) is displaceably guided in a rotatable manner and the core ( 16 ) in a rotationally fixed manner, a front end of the outer sleeve ( 14 ) has, for the attachment in the blind hole ( 9 ) of the stopper ( 8 ), at least one fixing hook ( 22 , 23 ) which is spring-loaded inwardly and which is movable between a fixing position in the blind hole ( 9 ) of the stopper ( 8 ) being directed outwardly sideways and an inwardly directed unlocked position, and, at a front end of the core ( 16 ), a cam ( 24 ) is provided, engaging with the fixing hook ( 22 , 23 ) such that, upon rotation of the outer sleeve ( 14 ), the fixing hook ( 22 , 23 ) is movable either to the fixing position or to the unlocked position.