A valve stopper for a medical injection device and a medical injection device for dispensing at least one composition

摘要

The present invention relates to a valve stopper (1) configured to be disposed inside a body (101) of an injection device (100) for injecting at least one composition through a distal end (104) of the body, said valve stopper (1) ) is: a membrane (2) comprising a proximal face (6) and a distal face (7), configured to separate a first distal chamber (108) of the body from a second proximal chamber (109) of the body , a membrane ( 2 ) - a lateral wall ( 3 ) extending distally from the membrane ( 2 ), or both distally and proximally, forming at least a distal cavity ( 4 ), the inner surface ( 102 ) of the body and a lateral wall (3) comprising a circumferential sealing surface (8) configured for sealing engagement with the proximal face (6) of the membrane (2) exhibiting a concave shape, the membrane (2) a notch (10, 20) extending through at least a portion of the thickness of the membrane (2) between the face (6) and the distal face (7), the notch (10, 20) allowing the fluid to pass through the second chamber (109) ) to the first chamber 108 only, depending on the pressure applied by the composition onto the proximal face 6 of the membrane 2 , the membrane 2 from characterized in that it is configured to selectively create a fluid path (30) therethrough.