Patent ID: 9421337
Filing Date: 2016-08-23
CPC Classification: A61M

Claim Text:
1. Auto-injector for administering a dose of a liquid medicament (M), comprising: a tubular chassis arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament (M), the chassis having a distal end (D) and a proximal end (P) with an orifice intended to be applied against an injection site, wherein the syringe is slidably arranged with respect to the chassis, a drive spring capable of operating the syringe to supply the dose of medicament (M), a control spring capable of pushing the needle from a covered position inside the chassis into an advanced position through the orifice and past the proximal end (P) for needle insertion, and advancing the chassis over the needle after at least partially delivering the medicament (M), an activating sleeve arranged to lock the drive spring and the control spring in a pressurized state prior to manual operation and capable of, upon manual operation, releasing the control spring and/or the drive spring for injection, wherein a carrier subassembly, comprising a tubular carrier is slidably arranged in the chassis, the carrier containing the syringe, the drive spring and a plunger for forwarding load of the drive spring to the stopper, wherein the syringe is locked for joint axial translation with the carrier, wherein the control spring is connectable to the carrier by a first interlock collar for needle insertion, wherein the activating sleeve comprises a second interlock collar arranged for releasing the drive spring when the carrier has at least almost reached an injection depth and wherein the first interlock collar is arranged for decoupling the control spring from the carrier and coupling it to the chassis for advancing it over the needle into a needle safe position.