Indsprøjtningsindretning til udførelse af medicinske injektioner

摘要

The present invention concerns a prefilled injection device having a container and a dose setting mechanism encapsulated inside the housing. The injection device incorporates an axial variable connection such that the distance between the distal end of the piston rod means and the plunger is minimized preferably to zero during assembly. The container and the dose setting mechanism are then mutually fastened, e.g. by laser welding. Consequently, possible clearance in assembly process of the injection device is obviated and priming of the device before an injection becomes redundant.