Patent ID: 9724472
Date: 2017-08-08
CPC Classifications: A61M

Claim:
1. Auto-injector for administering a dose of a liquid medicament (M), comprising: a substantially cylindrical housing arranged to contain a pre-filled syringe filled with the medicament (M), a needle shroud slibably arranged with respect to the housing and adapted to rest on the skin of a patient receiving an injection, a releasable drive spring arranged within the housing that is capable of, upon release, translating the needle shroud in a proximal direction (P) towards a safe position (PS), a rotating collar rotatably arranged within the housing, wherein the needle shroud in the safe position (PS) surrounds the injection needle and wherein the rotating collar directly engages the needle shroud in a manner that forces the rotating collar to rotate within the housing when the needle shroud is translated in the proximal direction (P) towards the safe position (PS), wherein the rotating collar is arranged to partially absorb excess energy of the drive spring and slow down the proximal movement of the needle shroud.