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.
Claims14
Auto-injector (1) for administering a dose of a liquid medicament (M), comprising:
- an elongate case (12) arranged to be held by a user,
- a tubular chassis (2) telescopable in the case (12) and biased against the case (12) so as to protrude from the case (12),
- a syringe (3) with a hollow injection needle (4), a drive spring (8) and a plunger (9) for forwarding load of the drive spring (8) to a stopper (6) of the syringe (3),
- a trigger button (13) distally arranged in or on the case (12),
- wherein the trigger button (13) is initially coupled to the case (12) in a manner to protrude distally from the case (12) and interlocked to the chassis (2) in a manner preventing the trigger button (13) from disengaging the case (12) and thus preventing actuation of the trigger button (13) in an initial position, wherein the case (12) is arranged to translate in the proximal direction (P) against the bias relative to the chassis (2) thereby also translating the trigger button (13) releasing the interlock to the chassis (2) so as to allow actuation of the trigger button (13), wherein the trigger button (13) is arranged to lock in a more proximal position on actuation.
Auto-injector (1) according to one of the preceding claims, characterized in that a releasable noise component (28) is provided, capable of, upon release, generating an audible and/or tactile feedback to a user, wherein the noise component (28) is arranged to be released when the plunger (9) reaches a position relative to the syringe (3) in which the stopper (4) is located in proximity of a proximal end of the syringe (3), and wherein the released noise component (28) impacts on a housing component (12, 13) indicating the end of the injection.
Dependencies are inferred from the claim text.