Auto-injector with needle shroud and needle protection cap

摘要

An auto-injector may be used to administer a dose of a liquid medicament (M). In some embodiments, a shroud is arranged inside a housing, the shroud slidable in longitudinal direction between at least a retracted position, in which a hollow injection needle is exposable and an advanced position, in which the needle is covered by the shroud. A protective needle shield is attachable to the needle in a manner to partially protrude beyond the proximal end of the shroud through the orifice with the needle in its advanced position. A syringe carrier is arranged inside the shroud and comprises at least one snap for locking it to the shroud in order to prevent relative axial motion. The snap is configured to automatically disengage upon removal of the protective needle shield to allow the syringe and needle to be retracted into the covered position under load of the syringe spring.

主权项

1. An auto-injector for administering a dose of a liquid medicament (M), the auto-injector having a distal end (D) and a proximal end P with an orifice intended to be applied against an injection site and comprising:
an elongate housing arranged to contain a syringe with a hollow needle and a stopper for sealing the syringe and displacing the medicament (M), wherein the syringe is slidably arranged with respect to the housing, a driver capable of, upon activation:
pushing the needle from a covered position into an advanced position through the orifice and past the proximal end (P), andoperating the syringe to supply the dose of medicament (M), and a trigger mechanism arranged to lock the driver in a compressed state prior to manual operation and capable of, upon manual operation, releasing the driver for injection, characterized in that a shroud is arranged at least partially inside the housing, the shroud slidable in longitudinal direction between at least a retracted position, in which the needle is exposable and an advanced position, in which the needle is covered by the shroud, wherein the shroud is arranged to be locked in the retracted position prior to manual operation of the trigger mechanism and wherein the shroud is arranged to be pushed towards the advanced position by a syringe spring when the driver has been released, wherein a protective needle shield is attachable to the needle in a manner to partially protrude beyond the proximal end of the shroud through the orifice with the needle in its advanced position, wherein a syringe carrier is arranged inside the shroud for holding the syringe, the syringe carrier slidable with respect to the shroud, wherein the syringe carrier comprises at least one resilient snap for locking it to the shroud in order to prevent relative axial motion, wherein the snap is arranged to be supportable from inside by the protective needle shield when attached to the needle in order to remain engaged with the shroud and wherein the snap is inwardly biased to disengage from the shroud without support from inside in a manner to automatically disengage upon removal of the protective needle shield, thus allowing the syringe and needle to be retracted into the covered position under load of the syringe spring.