Drive mechanism for an injection device

A - Human Necessities – 61 – M

Patent

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Details

A61M 5/31 (2006.01) A61M 5/20 (2006.01) A61M 5/24 (2006.01)

Patent

CA 2430917

A drive mechanism for an injection device is disclosed in which piston means are selectively driven to expel medicament from within a medicament cartridge. The drive mechanism comprises a drive means (270), first means (278) associated with the drive means, second gear means (274) being moveable between a first position in wich only movement along its longitudinal axis is permitted and a second position in which the second gear means (274) is free to rotate about the longitudinal axis, the piston means (280) being associated with the second gear means (274), a housing (276) within which the first gear means (278) and the second gear means (274) are constrained for movement, and baissing means (282) located between the housing (276) and second gear means (274) to bias the second gear means (274) to the first position.

L'invention concerne un mécanisme d'entraînement pour un dispositif d'injection dans lequel un moyen formant piston est entraîné de manière sélective de sorte qu'il expulse un médicament d'une cartouche de médicament. Le mécanisme d'entraînement comprend : un moyen d'entraînement (270), un premier moyen d'engrenage (278) associé au moyen d'entraînement, un second moyen d'engrenage (274) pouvant se déplacer entre une première position dans laquelle seul un déplacement le long de son axe longitudinal est autorisé et une seconde position dans laquelle le second moyen d'engrenage (274) peut effectuer librement un mouvement de rotation autour de l'axe longitudinal, le moyen formant piston (280) étant associé au second moyen d'engrenage (274) ; un compartiment (276) dans lequel le premier moyen d'engrenage (278) et le second moyen d'engrenage (274) sont contraints au niveau du déplacement ; et un moyen de sollicitation (282) situé entre le compartiment (276) et le second moyen d'engrenage (274), destiné à solliciter le second moyen d'engrenage (274) pour maintenir ce dernier dans la première position.

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