Patent ID: 8226618

Claim:
A pen-injector for manually administering set doses of a medicament, the injector adapted for accommodating a reservoir comprising a piston movable along a first axis within the reservoir and a medicament to be injected, the pen-injector comprising: a base member; a plunger for driving the piston axially in a distal direction; a driving member axially movable relative to the base member, the driving member movable in a proximal direction relative to an initial position so as to set a dose and manually pushable in a distal direction towards the initial position so as to eject a dose of the medicament; and a gear mechanism providing a gearing between the driving member and the plunger such that when the driving member is moved at a first speed relative to the base member, the plunger is moved at a second speed relative to the base member; wherein at least two of the base member, the plunger and the driving member are pivotally connected to the gear mechanism.