Abstract: An injection device includes a housing and a drive spring within the housing. The drive spring has a distal end and a proximal end opposite the distal end along the longitudinal axis. The drive spring defines an interior cavity. A plunger is disposed at least partially within a medicament container and a plunger rod is engaged with the plunger. A drive-lock mechanism includes a latch mechanism at least partially received within the interior cavity. The lock mechanism includes at least one engagement portion that releasably engages the plunger rod. A retraction collar is engaged with the latch mechanism that moves from a drive-locked position, which prevents unlocking of the drive-lock mechanism, to a drive-unlocked position relative to the retraction collar, in which decoupling of the drive-lock mechanism is permitted. A method of manufacturing the injection device is also described.

Abstract: An injection device includes a drive spring within the housing, a first drive component that transfers drive from the drive spring to a plunger disposed within a medicament container, and a damper concentrically arranged with respect to the first drive component. The damper is longitudinally fixed relative to the housing. The first drive component moves along the longitudinal axis relative to the damper under the influence of the drive spring. The damper frictionally engages a surface of the first drive component during movement of the drive component relative to the damper. A method of manufacturing the injection device is also described.