A dose setting mechanism and an injection syringe having...

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/24 (2006.01) A61M 5/31 (2006.01) A61M 5/315 (2006.01)

Patent

CA 2291342

A dose setting mechanism for a drug administration device and an injection syringe having such a dose setting mechanism are provided. The injection syringe has a housing accommodating an ampoule (3) containing medicine sufficient for a number of dosed injections, an injection press button (7), a piston rod (13) for co-operation with a piston in the ampoule (3) when injecting, and a dose setting mechanism comprising a rotatable dose setting element (5) interconnected with the press button. The dose setting mechanism further comprises a dose administration wheel (11) connected with the piston rod (13) and a coupling ring (12) connected with the dose setting element (5) and the press button (7). One of the dose administration wheel (11) and the coupling ring (12) at least partly surrounds the other, and the dose administration wheel (11) and the coupling ring (12) are arranged such that rotation of the dose setting element (5) allows the coupling ring (12) to be rotated in either direction in relation to the dose administration wheel (11), while activation of the press button (7), and thereby rotation of the coupling ring (12), causes the dose administration wheel (11) to be rotated.

L'invention concerne un mécanisme de dosage pour un dispositif d'administration de médicaments et une seringue d'injection présentant ce mécanisme. La seringue présente un boîtier logeant une ampoule (3) contenant une quantité suffisante de médicament pour un certain nombres d'injections dosées, un bouton poussoir (7) d'injection, une tige de piston (13) conçue pour coopérer avec un piston situé dans l'ampoule (3) lors de l'injection et un mécanisme de dosage comprenant un élément rotatif (5) doseur relié au bouton poussoir. Ledit mécanisme comprend en outre une molette (11) d'administration de la dose reliée à la tige de piston (13) et un anneau de couplage (12) relié à l'élément doseur (5) et au bouton poussoir (7). Soit la molette (11), soit l'anneau de couplage (12) entoure au moins partiellement l'autre. La molette (11) et l'anneau (12) sont disposés de telle sorte que la rotation de l'élément (5) doseur permet la rotation de l'anneau de couplage (12) dans les deux sens par rapport à la molette (11) d'administration de la dose, lors de l'actionnement du bouton poussoir (7), la rotation de l'anneau de couplage (12), faisant tourner la molette (11) d'administration de la dose.

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