Piston-cylinder unit for needle-free injector for providing sterile injection solution, has chamber arranged in cylinder, for receiving injection solution, and front wall having nozzle borehole or outlet element

摘要

The piston-cylinder unit (1) has a chamber (3) arranged in a cylinder (2), for receiving an injection solution, a front wall (5) having a nozzle borehole or an outlet element (6), and a another piston arranged in such a way that it moves in the chamber. The chamber is made from two parts with a chamber (8) and another concentric chamber (9). The cross-section of the former chamber is larger than the cross-section of the latter chamber. An independent claim is also included for a method for filling a cylinder-piston unit.