Medication dispensing apparatus with spring-driven locking...

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/315 (2006.01)

Patent

CA 2557897

A medication dispensing apparatus with a spring-driven locking feature includes a drive member movable in a distal direction within a housing, and a fluid container with a piston that is advanceable by the drive member (60) when such drive member is moved distally by a driving means. The apparatus includes a latching element (180) having a skid (190) that is slidable along a surface of the drive member as the drive member passes distally during advancement. The drive member is arranged with the skid so as to maintain a latching lip of the latching element against a spring force in a first position free of the driving means during dose preparing and injecting prior to a final dose administration. The skid-engaging surface shifts distally of the skid such that the skid passes beyond a proximal end of that surface upon administration of a final dose, whereby the latching lip is urged by the spring force from the first position to a second position to physically lock the driving means to prevent further dose preparing and injecting.

L'invention concerne un appareil pour administrer un médicament présentant une caractéristique de verrouillage commandée par un ressort. Ledit appareil comprend un élément de commande, pouvant se déplacer dans un sens distal à l'intérieur du logement, et un récipient de liquide comprenant un piston mobile qui peut être avancé par l'élément de commande, lorsque ledit élément de commande est déplacé de manière distale par des moyens de commande. Ledit appareil comprend un élément de verrouillage présentant une plate-forme qui peut coulisser le long d'une surface de l'élément de commande, lorsque l'élément de commande passe de manière distale. L'élément de commande est structuré et disposé avec la plate-forme de manière à maintenir la lèvre de verrouillage de l'élément de verrouillage contre une force du ressort dans une première position des moyens de commande, lors de la préparation du dosage et l'injection avant l'administration de la dose finale. La surface d'enclenchement de la plate-forme se déplace de manière distale, de sorte qu'elle passe derrière une extrémité proximale de la surface, lors de l'administration d'une dose finale, la lèvre de verrouillage étant déplacée par la force du ressort de la première position dans une seconde position, de manière à verrouiller physiquement les moyens de commande, ce qui permet d'empêcher la préparation et l'injection supplémentaire d'une dose.

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