Cylinder and piston suitable for storage of injection solutions for needleless injector and method for automatic filling or bubble free manual assembly cylinder piston also at atmospheric pressure

摘要

Drive cylinder piston (1) pressure-resistant, blocking water vapor and oxygen for a needleless injector with a chamber (3) disposed in a cylinder (2) for durable and sterile housing solution injection (4) with a stable end wall (5) with at least one nozzle bore or an output element (6), with a pressure-stable outer cylinder (13) and a piston (7) pressure movably disposed in the chamber (3) and which blocks water vapor and oxygen, - wherein the chamber (3) is configured with a first chamber (8) and a second chamber (9) concentrically in the cross section of the first chamber (8) is greater than the cross section of the second chamber (9), and - in which each nozzle bore or each outlet (6) is configured closed sterile by a membrane (26, 27) which blocks water vapor and oxygen and which opens with overpressure, characterized by q ue the piston (7), which is constituted by a body inner piston (18) and a flange (22) is configured wrapped with an outer ring piston (17) crushable with blocking effect of water vapor and oxygen , pressure-stable and sterile closure.