Patent ID: 9375534
Filing Date: 2016-06-28
CPC Classification: A61M

Claim Text:
1. Drive mechanism for a drug delivery device, comprising: a body having a distal end and a proximal end, which are spaced apart in the direction of an axis, a first output member arranged within the body, the first output member being rotatable around the axis relatively to the body, a second output member arranged within the body along the axis, the second output member being movable relatively to the body along the axis, the first output member and the second output member being rotationally coupled, and a drive feature that is provided to generate a rotation of the first output member, characterized in that the device further comprises a removable and attachable part, which is removable from and attachable to the body, the first output member being unidirectionally rotationally coupled with the drive feature when the part is attached to the body, so that the first output member is rotatable in one direction, a resilient element, the removable and attachable part restraining the resilient element when the part is attached to the body, and the resilient element removing the unidirectional rotational coupling when the removable and attachable part is removed from the body, so that the first output member is rotatable in an opposite direction.