Patent ID: 9636459
Date: 2017-05-02
CPC Classifications: A61M,F04C,Y10T

Claim:
1. An auto-injector for administering a dose of a liquid medicament (M), comprising: a tubular chassis telescopable in an elongate case, a carrier subassembly comprising a tubular carrier slidably arranged partially inside the chassis and 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 control spring arranged around the carrier, a needle insertion control mechanism comprising a first collar, the needle insertion control mechanism configured to couple a proximal end of the control spring to either the carrier for advancing it for needle insertion or to the chassis, wherein the first collar of the needle insertion control mechanism is biased by the control spring in a proximal direction (P), wherein a first clip is arranged on one of the chassis or the first collar initially abutting a block on the other of the chassis or the first collar, wherein a ramped engagement between the first clip and the carrier is provided for outwardly deflecting the first clip on translation of the carrier in the proximal direction (P), wherein outward deflection of the first clip and translation of the carrier in the proximal direction (P) is initially prevented by the case outwardly abutting the fifth first clip, wherein the case is at least initially biased in the distal direction (D), wherein the case is arranged to translate against the bias in the proximal direction (P) relative to the chassis into an advanced position thereby translating a window in the case outwardly behind the first clip thus allowing outward deflection so as to decouple the first clip from the block and to allow the first collar to abut against the carrier and advance it under load of the control spring.