An injection device comprising a locking nut

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/20 (2006.01) A61M 5/315 (2006.01)

Patent

CA 2681023

The invention relates to an injection device for injecting a dose of drug. Theinjection device com prises a housing, a dose setting mechanism being operable to set a desired dose, an injection mechanism comprising a piston rod (7) adapted to cooperate with a piston positioned in a cartridge containing a drug to be delivered in order to cause a set dose to be delivered from the cartridge via the injection device, a dosage tube (6), and retaining means arranged to prevent axial movement of the dosage tube in a distal direction relatively to the housing during dose setting. The dose setting mechanism com prises a rotatable dose knob (24), operation of the dose setting mechanism causing energy to be stored in a spring member. The injection mechanism is driven by releasing energy previously stored in the spring member during dose setting.

L'invention porte sur un dispositif d'injection permettant d'injecter une dose de médicament. Le dispositif d'injection comprend un boîtier, un mécanisme de dosage réglable pour l'obtention de la dose souhaitée, un mécanisme d'injection constitué d'une tige de piston (7) conçue pour coopérer avec un piston placé dans une cartouche contenant un médicament à administrer et ainsi à provoquer la libération d'une dose déterminée depuis la cartouche via le dispositif d'injection ; il comprend également un tube de dosage (6) et un moyen de retenue agencé de manière à empêcher tout mouvement axial du tube de dosage dans une direction distale par rapport au boîtier lors du dosage. Le mécanisme de dosage comprend un bouton de dosage rotatif (24), la mise en AEuvre du mécanisme de dosage produisant une énergie alors stockée dans un élément faisant ressort. Le mécanisme d'injection est entraîné par la libération de l'énergie stockée dans l'élément faisant ressort au cours du dosage.

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