US Patent 9352090 Auto-injector

An auto-injector comprising a tubular chassis, a carrier subassembly comprising a tubular carrier slidably arranged partially inside the chassis, a drive spring and a plunger, the syringe is lockable for joint axial translation with a carrier, a control spring, and a needle insertion control mechanism comprising a first collar biased by the control spring in a proximal direction. At least one resilient beam is proximally arranged on the first collar, wherein respective recesses are arranged in the carrier and case. A transversal extension of a head of the resilient beam is wider than a gap between the carrier and the chassis causing the head of the resilient beam to abut a distal face on the recess in the chassis.