Drug delivery device inner housing having helical spline

Details Drug delivery device inner housing having helical spline Drug delivery device inner housing having helical spline

A - Human Necessities

61

M

A61M 5/315 (2006.01)

Patent

CA 2761285

A dose setting mechanism (4) for a drug delivery device (1) is disclosed. The mechanism comprises an outer housing (40) and an inner housing (44) having an external groove (62) and a helical spline (68). The inner housing helical spline guides a driver (30) to dispense a set dose. A dial sleeve (10) is disposed between the outer and inner housing and is rotatably engaged with the inner housing. When a dose is set, the dial sleeve is rotated and translates away from both the outer housing and the inner housing.

Cette invention concerne un mécanisme d'ajustement de dose (4) pour dispositif d'administration de médicament (1). Le mécanisme comprend un boîtier extérieur (40) et un boîtier intérieur (44) comportant une rainure extérieure (62) et une cannelure hélicoïdale (68). La cannelure hélicoïdale du boîtier intérieur guide un élément menant (30) pour délivrer une dose définie. Un manchon à trous (10) présent entre les boîtiers extérieur et intérieur vient se loger en rotation dans le boîtier intérieur. Quand une dose est prête, on fait tourner le manchon à trous qui s'écarte par translation à la fois du boîtier extérieur et du boîtier intérieur.

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