DRUG DELIVERY DEVICE

摘要

A drug delivery device (4) for dispensing one or more doses of a drug is provided. The device (4) comprises a drive member (1 ) for driving a piston rod (5) and a dose member (46) for actuating the drive member (1 ). The piston rod (5) is coupled to the drive member (1 ) such that a relative translational movement of the drive member (1 ) and the piston rod (5) is allowed and a relative rotational movement is prevented. The drive member (1 ) is configured to be driven by the dose member (46) around the longitudinal axis in a first (110) and a second rotational direction (111 ) opposite to each other. Furthermore, a drug delivery device (4) is provided, wherein the drive member (1 ) has stable and unstable states and wherein in an unstable state the drive member (1 ) is biased by biasing means(3) towards a stable state.