Patent ID: 9295785
Filing Date: 2016-03-29
CPC Classification: A61M

Claim Text:
1. A front end for an auto-injector, the front end comprising: a syringe with an injection needle and a stopper, wherein the syringe is slidably arranged within a syringe retainer, wherein an outer sleeve for preventing access to the needle is removably arrangeable over the syringe retainer, wherein the syringe retainer comprises a screw thread for connecting it to a correspondent screw thread of a mounting of a re-usable auto-injector back end comprising a drive means for advancing the syringe and needle in a proximal direction for needle insertion and for advancing the stopper within the syringe for injection, wherein a resilient locking barb is arranged on the syringe retainer proximally from the screw thread of the syringe retainer, wherein the resilient locking barb is arranged to rotationally lock the syringe retainer to the mounting in an unscrewing direction when the front end is screwed to the re-usable back end and when the outer sleeve is removed, and the resilient locking barb exhibits a chamfer for inwardly deflecting the resilient locking barb by an internal surface of the mounting when rotated in a screwing direction, wherein the outer sleeve is arranged to unlock the resilient locking barb when arranged over the syringe retainer, the resilient locking barb being arranged to partially remain outside of the mounting so as to allow the outer sleeve to inwardly deflect the locking barb to unlock it, and wherein the resilient locking barb is arranged to engage an internal groove arranged in the mounting.