Patent ID: 9623181
Date: 2017-04-18
CPC Classifications: A61M,F04C,Y10T

Claim:
1. Auto-injector for administering a dose of a liquid medicament, comprising: an elongate tubular case, a carrier subassembly comprising a tubular carrier slidably arranged 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, wherein the drive spring acts between the carrier and the plunger, wherein the carrier comprises a ramp, wherein the plunger comprises an outward protrusion, wherein the outward protrusion on the plunger in an initial state is locked to the ramp on the carrier to form a ramped engagement to the carrier and is prevented from rotating out of the ramped engagement depending on a relative longitudinal position of the carrier in the case, wherein the plunger is arranged to be released and to rotate out of the ramped engagement upon the needle reaching at least nearly a predefined injection depth on translation of the carrier in the proximal direction for advancing the needle beyond a proximal end of the auto-injector.