Gearing mechanism for an injection device
First Claim
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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Abstract
An injection device comprising: a base member (102); a plunger (104) for driving a piston in a distal direction; a driving member (106); and a gear mechanism (108) providing a gearing between the driving member (106) and the plunger (104) such that then the driving member (106) is moved at a first speed relative to the base member (102), the plunger (104) is moved at a second speed relative to the base member (102); wherein at least two of the base member (102), the plunger (104) and the driving member (106) are pivotally connected to the gear mechanism (108).
306 Citations
17 Claims
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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:
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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, and wherein the gear mechanism comprises a lever mechanism coupling a distally directed movement of the driving member with a distally directed movement of the plunger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. 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:
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a base member; a plunger for driving the piston axially in a distal direction wherein said plunger comprises a threaded inner surface which is adapted to engage a threaded outer surface of a piston rod, or where said plunger is arranged to cooperate with a pawl and ratchet mechanism which provides for telescopic engagement between said plunger and said piston; 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, and wherein 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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Specification