Syringe device with a dose limiting mechanism and an additional safety mechanism
DCFirst Claim
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1. A syringe device for ejecting a dose of a medicament, the syringe device comprising:
- a housing;
a dose setting member rotatable and longitudinally fixed in relation to the housing so as to set a dose to be ejected,a dose ejecting mechanism comprising;
a piston rod arranged with respect to the housing such that translational movement of the piston rod in a distal direction causes the set dose to be ejected,structure for transforming rotational movement of the dose setting member into translational movement of the piston rod during ejection of the set dose in the form of an ejection assisting system comprising a pre-strained torsional spring arranged to rotate a driver relative to the housing, the pre-strained torsional spring providing an ejection force forcing the piston rod in the distal direction so as to eject the set dose without the aid of a user, when the user has initiated the ejection of the set dose;
a dose limiting mechanism operably connected with the dose ejecting mechanism to prevent ejection of a dose exceeding the set dose; and
a safety mechanism structure operably connected to the dose ejecting mechanism such that if the dose limiting mechanism fails, the safety mechanism structure prevents ejection of a dose exceeding the set dose.
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Abstract
A syringe device for ejecting a dose of a medicament, the syringe device comprising: a dose limiting mechanism arranged to interact with a dose ejecting mechanism to prevent ejection of a dose exceeding a set dose, and a safety mechanism, which is arranged such with respect to the dose ejecting mechanism that, if the dose limiting mechanism fails, the safety mechanism prevents ejection of a dose exceeding the set dose.
41 Citations
8 Claims
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1. A syringe device for ejecting a dose of a medicament, the syringe device comprising:
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a housing; a dose setting member rotatable and longitudinally fixed in relation to the housing so as to set a dose to be ejected, a dose ejecting mechanism comprising; a piston rod arranged with respect to the housing such that translational movement of the piston rod in a distal direction causes the set dose to be ejected, structure for transforming rotational movement of the dose setting member into translational movement of the piston rod during ejection of the set dose in the form of an ejection assisting system comprising a pre-strained torsional spring arranged to rotate a driver relative to the housing, the pre-strained torsional spring providing an ejection force forcing the piston rod in the distal direction so as to eject the set dose without the aid of a user, when the user has initiated the ejection of the set dose; a dose limiting mechanism operably connected with the dose ejecting mechanism to prevent ejection of a dose exceeding the set dose; and a safety mechanism structure operably connected to the dose ejecting mechanism such that if the dose limiting mechanism fails, the safety mechanism structure prevents ejection of a dose exceeding the set dose. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification