Patent ID: 9687607
Date: 2017-06-27
CPC Classifications: A61M,F04C,F16B,Y10T

Claim:
1. An auto-injector for administering a dose of a liquid medicament (M), comprising: a tubular chassis telescopable in a tubular case, a carrier subassembly comprising a tubular carrier slidably arranged relative to the chassis inside the case, the carrier adapted to contain a syringe with a hollow injection needle, a drive spring and a plunger for forwarding load of the drive spring to a stopper of the syringe, wherein the syringe is lockable for joint axial translation with the carrier, a trigger button arranged to advance the carrier in the proximal direction (P), a detent mechanism for controlling translation of the carrier relative to the chassis, wherein the chassis and the carrier are initially coupled for joint axial translation relative to the case, wherein the detent mechanism is arranged to decouple the chassis from the carrier upon actuation of the trigger button thus allowing the carrier to move relative to the chassis, wherein the detent mechanism is attached to the carrier and the chassis, wherein the detent mechanism comprises at least one clip on one of the chassis and the carrier arranged to be in a ramped engagement with a recess in the other one of the chassis and the carrier in an initial state in such a manner that translation between the chassis and the carrier is constrained and that application of a translative force between the chassis and the carrier in one longitudinal direction (P, D) with the clip engaged with the recess deflects the clip out of the recess when a predetermined value of the translative force, at least depending on the resilience of the clip, is overcome so as to allow translation between the chassis and the carrier.