Trigger mechanism for a drug delivery device

A - Human Necessities – 61 – M

Patent

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A61M 15/00 (2006.01)

Patent

CA 2755455

The invention relates to a trig-ger mechanism for a drug delivery device comprising at least one energy storing ele-ment, an actuation element and a series of cas-caded trigger elements. The trigger elements are pre-stressed with increasing pre-stressing and coupled to the at least one energy storing element such that the trigger elements, upon exerting a sufficient actuation force (Fa, U) on the actuation element, cause a cascaded release of increasing portions of energy stored in the at least one energy storing device. At least one of the trigger elements is equipped with a latch element directly coupling at least two trigger elements such that the latch element restrains at least one of these trigger elements to its pre--stressed state before exerting the actuation force (Fa, U).

L'invention porte sur un mécanisme déclencheur pour dispositif d'administration de médicament, comprenant au moins un élément de stockage d'énergie, un élément d'actionnement et une série d'éléments déclencheurs en cascade. Les éléments déclencheurs sont précontraints avec une précontrainte accrue et couplés à au moins un élément de stockage d'énergie tel que les éléments déclencheurs, lors de l'exercice d'une force d'actionnement suffisante (Fa, U) sur l'élément d'actionnement, amènent une libération en cascade de parties croissantes d'énergie stockée dans le ou les dispositifs de stockage d'énergie. Au moins l'un des éléments déclencheurs est équipé d'un élément de verrou couplant directement au moins deux éléments déclencheurs de telle sorte que l'élément de verrou maintient au moins l'un de ces éléments déclencheurs dans son état précontraint avant l'exercice de la force d'actionnement (Fa, U).

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