Auto-injector
AssigneeSanofi-Aventis Deutschland GmbH
InventorsSimon Francis Brereton, Thomas Mark Kemp, Rosie Burnell, Matthew Ekman
Life of this patent
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Abstract
An auto-injector for administering a dose of a liquid medicament (M) is presented having an elongate case arranged to be held by a user, a tubular chassis telescoped in the case and biased against the case so as to protrude from the case. The injector also includes a syringe with a hollow injection needle, a drive spring and a plunger for forwarding load of the drive spring to a stopper of the syringe. A trigger button is distally arranged in or on the case, wherein the trigger button is initially coupled to the case in a manner to protrude distally from the case and interlocked to the chassis in a manner preventing the trigger button from disengaging the case.
Claims15
An auto-injector for administering a dose of a liquid medicament, comprising:
- an elongate case;
- a tubular chassis telescopable in the elongate case and biased against the elongate case;
- a syringe;
- a drive spring;
- a plunger for forwarding a load of the drive spring to a stopper of the syringe;
- and
- a trigger button distally arranged in or on the elongate case,
- wherein the trigger button is initially coupled to the elongate case and interlocked to the tubular chassis in an initial position,
- wherein the trigger button exhibits at least one proximal beam arranged to be in a ramped engagement with the elongate case in a manner to inwardly deflect the at least one proximal beam and decouple the trigger button from the elongate case when the trigger button is forced in a proximal direction against the elongate case,
- wherein, in the initial position, the at least one proximal beam inwardly abuts a carrier so as to prevent inward deflection,
- wherein the carrier is initially coupled to the tubular chassis for joint axial translation by a detent mechanism,
- wherein the detent mechanism is arranged to decouple the tubular chassis from the carrier upon actuation of the trigger button to allow the carrier to move relative to the tubular chassis, and
- wherein a first window in the carrier is arranged so as to allow inward deflection of the at least one proximal beam when the elongate case is translated in the proximal direction from the initial position.
Dependencies are inferred from the claim text.