Patent ID: 8876766

Claim:
A medicament delivery device, comprising: a housing having a proximal section and a distal section formed by a first housing part and a second housing part; a first compartment inside the proximal section for accommodating a medicament container that includes at least one stopper; a circle-segment-shaped second compartment inside the distal section for accommodating a drive unit configured for moving the at least one stopper in a proximal direction within the medicament container; wherein the drive unit comprises: a support wheel rotatably arranged inside the second compartment and comprising a central tubular hub on which first and second washer-shaped disks are fixedly attached in parallel to each other and interconnected by an abutment cross-wall; a plurality of spherical members arranged in a row between the abutment wall and adjacent the stopper, the plurality of spherical members being guided in a channel formed by an inner periphery of the circle-segment-shaped second compartment, by an outer periphery of the central tubular hub, by inner side surfaces of the washer-shaped disks, and by a guide member; a pre-tensioned clock spring coaxially arranged within the central tubular hub and having an outer end connected to the central tubular hub and an inner end connected to a one-direction-rotatable tubular hub coaxially arranged around a shaft fixedly attached to the first housing part; and an activation member interactively connected to the first washer-shaped disk by a co-acting hold-and-release mechanism, such that when the activation member is in a non-depressed position, the support wheel and clock spring are held in at least one tensioned and static state, and when the activation member is moved from the non-depressed position to a depressed position, the clock spring and thereby the support wheel are released from the at least one tensioned and static state such that the plurality of spherical members are forced against the at least one stopper.