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Gearing mechanism for an injection device

  • US 8,900,204 B2
  • Filed: 06/20/2012
  • Issued: 12/02/2014
  • Est. Priority Date: 05/16/2006
  • Status: Expired due to Fees
First Claim
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1. 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, andwherein the gear mechanism comprises a lever mechanism coupling a distally directed movement of the driving member with a distally directed movement of the plunger.

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