Medicament delivery device

A medicament delivery device, comprising:

• a generally tubular distal housing part;
• a generally tubular medicament container holder having opposite distal and proximal ends, wherein the distal end is releasably connected to the distal housing part, and the proximal end is releasably connected to a delivery member;
• a medicament container having at least one slidable stopper, wherein the container is arranged within the container holder;
• a plunger rod having opposite proximal and distal ends and arranged within the distal housing part, wherein the proximal end of the plunger rod abuts the at least one slidable stopper;
• a resilient force mechanism operably connected to the plunger rod for driving the plunger rod and thereby the at least one slidable stopper toward a proximal end of the device;
• an actuation mechanism, comprising a flexible locking device releasably connected to the plunger rod for holding the plunger rod and thereby the resilient force mechanism in a pre-tensioned state, and an activation button distally protruding from the distal housing part;
• a release mechanism slidably displaceable around the flexible locking device between a first position, in which the release mechanism completely surrounds the flexible locking device, and a second position, in which the release mechanism partially surrounds the flexible locking device after the release mechanism is distally displaced by the container holder when the container holder is displaced into the distal housing part;
• wherein the flexible locking device is arranged to be released from the plunger rod only after the release mechanism is moved from the first position to the second position and the activation button is proximally depressed, such that the flexible locking device comes completely out of contact with the release mechanism;
• and
• a resilient device arranged surrounding the release mechanism and to act axially on the actuation mechanism;
• wherein the plunger rod comprises a number of stop engagements arranged on its outer circumferential surface to co-act with corresponding stop engagements arranged on the flexible locking device, such that when the activation button is proximally depressed, stop engagements on the flexible locking device come out of contact with a stop engagement on the plunger rod, and such that when the activation button is released, the resilient device forces the activation button and thereby the flexible locking device to move distally such that stop engagements on the flexible locking device come into contact with another stop engagement on the plunger rod.