Patent ID: 8167834
Filing Date: 2012-05-01
Classification: A61M

Abstract:
1. An injection device configured for dispensing a substance from a dual or multi-chamber cartridge, said cartridge having a bung moveable in a first reconstitution phase of movement and a second, dosing phase of movement, said device comprising: a body portion ( a plunger ( a plunger drive element ( said plunger having a drive portion ( a drive mechanism to apply a pre-selectable amount of angular movement to said plunger drive element on activation thereof, said drive mechanism comprising: a trigger member operable to prevent rotary movement of said drive element and releasable to allow said spring to rotate said dose setting member and said plunger drive element by an amount corresponding to the set dose, whereby, during a reconstitution phase, said plunger is moved longitudinally forward from a position with the non-drive portion adjacent said drive element but not in driving engagement therewith, to bring its drive portion into driving engagement with the drive portion on said drive element.