Drive assembly and use of a spring in a drug delivery device

摘要

Resettable drive assembly for a drug delivery device is provided for. The resettable drive assembly may comprise a housing (10A, 10B, 10C), a piston rod (20) being rotatable and axially displaceable with respect to the housing between a proximal start position and a distal end position, a drive member (30) for distally displacing the piston rod towards the end position when dispensing a dose, and a stop member (50). The drive member is operable to interact with the piston rod for forming an unlockable first interlock, the first interlock being operable to block proximal movement of the piston rod with respect to the drive member. The stop member is operable to interact with the piston rod for forming an unlockable second interlock, the second interlock being operable to block proximal movement of the piston rod with respect to the housing. When the drive assembly is in a drive mode, the interlocks are locked such that proximal movement of the piston rod from the end position to the start position is prevented. For switching the drive assembly from the drive mode to a reset mode, the piston rod is rotatable with respect to the drive member for unlocking the first interlock and the stop member and the piston rod are rotatable with respect to each other for unlocking the second interlock. When the drive assembly is in the reset mode, the first interlock and the second interlock are unlocked such that proximal movement of the piston rod to the start position is allowed. Further, a drug delivery device and a use of a spring are provided for.