Patent ID: 7066909
Filing Date: 2006-06-27
Classification: A61M

Abstract:
1. An apparatus for administering a liquid medicament, comprising a housing, a piston, a container and a propelling device, said propelling device comprising: (a) abase element; (b) an axially fixed drive member, the drive member being rotatively mounted in the base element; (c) a first shifting stage, the first shifting stage being shiftable relative to said base element, wherein said first shifting stage, on shifting, advancing said piston in said container resulting in said liquid medicament being dispensed from said container in a metered manner; and (d) a second shifting stage, the second shifting stage being shiftable relative to the drive member wherein the second shifting stage slaves the first shifting stage, thereby forming a first spindle drive; wherein the first and said second shifting stages, when seen in said advance direction of said piston, overlap at least in part, the first and second shifting stages together forming a first spindle drive, a rotational movement of which causes the first shifting stage to shift and wherein, the container being mounted in the housing such that the container is prevented from shifting, the piston being held in said container and said first shifting stage being connected to said piston only by exerting contact pressure on said piston.