Patent ID: 8425460

Claim:
A needle shroud assembly for an injection device, said assembly comprising: a barrel; a needle shroud captively telescoped relative to the forward end of the barrel for longitudinal movement between an extended position and a retracted position; a shroud bias urging said needle shroud towards said extended position; and a locking collar mounted for rotational movement with respect to said barrel and with respect to said needle shroud between a safe position in which retraction movement of said needle shroud is prevented or limited, and a live position in which said needle shroud may pass towards the retracted position, said locking collar being manually and externally actuatable, wherein one of said needle shroud and said locking collar has a keyway and the other thereof has a cooperating key arranged so that said key and said keyway being out of alignment obstructs relative longitudinal movement of said key with respect to said keyway when said locking collar is in the safe position and so that said key and said keyway being aligned does not obstruct relative longitudinal movement of said key with respect to said keyway when said locking collar is in the live position.