Patent ID: 6241709
Filing Date: 2001-06-05
Classification: A61M

Abstract:
An injection device comprisinga housing, a retainer axially movable within said housing for movement therein, during an injection, between a distal position and a proximal position thereof,a fluid container within said retainer,a plunger axially movable within said fluid container,a driving member axially displaceable within said housing,a toothed rod having a plurality of teeth arranged thereon in a longitudinal direction, said toothed rod being disposed in said housing for axial displacement therein and for acting on said plunger to express fluid from said fluid container during an injection,a first coupling device cooperating with teeth on the toothed rod, provided on said retainer, which normally locks said toothed rod to said retainer but permits relative axial movement therebetween while said retainer is not within a first predetermined axial position range inside said housing, and said toothed rod is moving in a predetermined axial rod movement direction, anda second coupling device, cooperating with teeth on the toothed rod, provided on said driving member, which normally locks said driving member to said toothed rod but permits relative axial movement therebetween while said driving member is not within a second predetermined axial position range inside said housing, and said driving member is moving in a predetermined driving member axial movement direction.