Patent ID: 9272096
Filing Date: 2016-03-01
CPC Classification: A61M

Claim Text:
1. A drive assembly for a drug delivery device, the drive assembly being connectable with a cartridge holder and comprising: a housing a piston rod, the piston rod being movable in a distal direction for drug delivery, a guide nut, the guide nut being rotatable relative to the housing around an axis of the assembly and provided for guiding the piston rod, a locking means, the locking means being enabled to take an engaged state in which the locking means is engaged with the guide nut in order to prevent rotation of the guide nut and to take a disengaged state in which the locking means is disengaged from the guide nut in order to allow rotation of the guide nut, and a coupling means, the coupling means being rotatable relative to the housing around the axis of the assembly for interaction with the locking means in order to change between the engaged state and the disengaged state of the locking means, wherein the coupling means comprises one or more retaining means for preventing axial movement of the coupling means with respect to the housing.