AUTO-INJECTOR Russian patent published in 2017 - IPC A61M5/20 

FIELD: medical equipment.

SUBSTANCE: invention relates to medical equipment, particularly, to an auto-injector for administering a dose of a liquid medicament. Injector comprises an elongate case arranged to be held by a user, tubular chassis telescopable in the case and biased against the case so as to protrude from the case, syringe with a hollow injection needle, drive spring and a plunger for forwarding load of the drive spring to a stopper of the syringe, trigger button which is initially abutted against the case preventing actuation, wherein the chassis is arranged to translate into the case against the pressed bias, wherein the trigger button is at least initially coupled to the chassis in such a manner that the trigger button emerges from the case, when the chassis is being translated towards the case for starting an injection cycle, trigger button is arranged distally in or on the case, carrier subassembly comprises a tubular carrier slidably arranged relative to the chassis inside the case, carrier adapted to contain the syringe with the hollow injection needle, the drive spring and the plunger, wherein the syringe is lockable for joint axial translation with the carrier, wherein the trigger button is initially coupled to the chassis through the carrier by the trigger button abutting the carrier, and the carrier being coupled to the chassis by a detent mechanism, wherein the a detent mechanism is arranged for coupling the chassis to the carrier 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.

EFFECT: administering a dose of a liquid medicament.

23 cl, 27 dwg