Injection Device
AssigneeSHL Group AB
InventorCarlos Guillermo
Life of this patent
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Abstract
The present invention relates to an injection device comprising a medicament container (18) and a needle attached to said container, means (12,72) for automatic penetration of the needle, injection of medicament and withdrawal of the needle, comprising the steps of initiating a penetration sequence, followed by an injection sequence and followed by a withdrawal sequence, wherein a previous sequence triggers a subsequent sequence, and wherein said device further comprises a dampening means arranged and designed to dampen the movement of the injection means during the whole injection sequence.
Claims7
-4. (canceled)
An injection device, comprising:
- an elongated housing;
- a container carrier having a medicament container to which a needle is attached;
- a penetration mechanism, comprising a decoupling sleeve, a preloaded penetration spring device capable of acting on the decoupling sleeve and thereby on the container carrier causing a sliding movement of the container and needle, and a penetration holding device configured for holding the penetration spring device in a loaded state;
- an injection mechanism, comprising a plunger rod arranged to act on a stopper in the medicament container, a preloaded injection spring device configured for acting on the plunger rod for displacement of the stopper inside the container, and an injection holding device configured for holding the injection spring device in a loaded state;
- a withdrawal mechanism, comprising a preloaded retraction spring arranged to act on the decoupling sleeve and thereby on the container carrier, and a withdrawal holding device configured for holding the retraction spring in a loaded state;
- a penetration sequence initiating mechanism configured for acting on a penetration trigger device arranged on the decoupling sleeve for disconnecting the penetration holding device;
- an injection trigger device arranged on the decoupling sleeve and configured for disconnecting the injection holding device for initiating an injection sequence when the decoupling sleeve and the plunger rod have moved to a certain position;
- a withdrawal trigger device arranged on the decoupling sleeve and configured for disconnecting the withdrawal holding device for initiating a needle withdrawal when the plunger rod has moved to a certain position;
- and
- a damping mechanism, comprising a compartment containing a volume of viscous liquid and defined in part by an outer surface of the plunger rod and an inner surface of a cap, wherein the compartment is configured with a passage through which the viscous liquid can be forced only when the injection sequence is initiated, such that the volume within the compartment decreases as the plunger rod moves within the container during the injection sequence and thereby creating a damping shear force.
Dependencies are inferred from the claim text.