EP2438940A1 — Auto injector with a torsion spring

USPTO Abstract

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 (7), wherein the syringe (7) is slidably arranged with respect to the housing (2), - spring means (14) capable of, upon activation, pushing the needle (9) from a covered position inside the housing (2) into an advanced position through the orifice and past the proximal end (P) as well as operating the syringe (7) to supply the dose of medicament (M), - activating means (4) arranged to lock the spring means (14). The spring means (14) is a torsion spring (14). The activating means (4) is a trigger button (4), arranged at a distal end (D) of the housing (2) and operable by being pressed in proximal direction (P).