AUTO-INJECTOR

摘要

The invention relates to an auto-injector (1) for administering a dose of a liquid medicament (M), comprising: - an elongate housing (2) arranged to contain a syringe (3), wherein the syringe is slidably arranged with respect to the housing, - spring means (8) capable of, upon activation: - pushing the needle (4) from a covered position inside the housing (2) into an advanced position - operating the syringe to supply the dose of medicament, and - retracting the syringe with the needle into the covered position after delivering the medicament, - activating means (20). The spring means is a single drive spring (8) for advancing the needle and for injecting the dose of medicament via a plunger (9). An interlock sleeve (45) is telescoped in the proximal (P) end of the housing. The activating means comprises a trigger button (20) arranged at the distal end (D) of the auto - injector, wherein the trigger button is locked, thereby preventing actuation when the interlock sleeve is in its proximal position in an as delivered state and wherein translation of the interlock sleeve unlocks the trigger button so as to allow actuation.