Resettable drug delivery device
First Claim
Patent Images
1. A resettable dosing mechanism, said dosing mechanism comprising:
- an inner housing preferably having at least one helical groove;
a dose dial sleeve rotationally engaged with the at least one helical groove of said housing;
a driver provided within said housing; and
a first clutch provided between said dial sleeve and said driver;
a second clutch between said inner housing and said driver;
wherein when a dose is set with said dose setting mechanism, said first clutch engages said dose dial sleeve and said driver to rotate together relative to said housing;
wherein when the set dose is injected, said first clutch disengages said dose dial sleeve from said driver while said second clutch couples said driver to said inner housing,so that said dose dial sleeve rotates and said driver is prevented from rotating but moves axially against a spindle to expel said set dose; and
wherein when resetting said dosing mechanism, said first clutch decouples said driver from said dose dial sleeve and said second clutch decouples said driver from said housing, allowing said driver to be moved to a reset position.
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Abstract
A resettable dosing mechanism comprises a dose button and a dial grip operatively coupled to the dose button. A spindle acts on a bung of a cartridge and a driver is operatively coupled between the dose button and the spindle. During an injection of the dose, the dose button moves in an axial direction to cause the spindle to administer the dose. During resetting of the dose setting mechanism, the spindle is retracted back into the dose setting mechanism. An advantageous resetting mechanism is described.
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Citations
12 Claims
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1. A resettable dosing mechanism, said dosing mechanism comprising:
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an inner housing preferably having at least one helical groove; a dose dial sleeve rotationally engaged with the at least one helical groove of said housing; a driver provided within said housing; and a first clutch provided between said dial sleeve and said driver; a second clutch between said inner housing and said driver; wherein when a dose is set with said dose setting mechanism, said first clutch engages said dose dial sleeve and said driver to rotate together relative to said housing; wherein when the set dose is injected, said first clutch disengages said dose dial sleeve from said driver while said second clutch couples said driver to said inner housing, so that said dose dial sleeve rotates and said driver is prevented from rotating but moves axially against a spindle to expel said set dose; and wherein when resetting said dosing mechanism, said first clutch decouples said driver from said dose dial sleeve and said second clutch decouples said driver from said housing, allowing said driver to be moved to a reset position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A resettable drug delivery device, said device comprising:
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a cartridge holder comprising a releasable mechanical interlock; a resettable dosing mechanism comprising, an inner housing preferably having at least one helical groove; a dose dial sleeve rotationally engaged with the at least one helical groove of said housing; a driver provided within said housing a spindle operatively connected to the driver; a first clutch provided between said dial sleeve and said driver; a second clutch between said inner housing and said driver; and a dose dial grip or a dose button operativey engaged with the first clutch and configured so that a user is not required to manually pull the dose dial grip or the dose button in a proximal direction to reset the resettable dosing mechanism; wherein when a dose is set with said resettable dosing mechanism, said first clutch engages said dose dial sleeve and said driver to rotate together relative to said housing; wherein when the set dose is injected, said first clutch disengages said dose dial sleeve from said driver while said second clutch couples said driver to said inner housing, so that said dose dial sleeve rotates and said driver is prevented from rotating but moves axially against the spindle to expel said set dose; and where the dose setting mechanism is releasably coupled to said mechanical interlock, wherein during resetting of the dosing mechanism the spindle is retracted back into the resettable dosing mechanism, wherein a user is not required to manually pull back the dose dial grip or dose button in a proximal direction in order to enable spindle retraction back into the resettable dosing mechanism said dosing mechanism further comprising a transfer sleeve operatively engaged with said dose button or said dose dial grip, and a rotatable dose setting sleeve surrounding said transfer sleeve, such that when said dose setting sleeve is rotated to reach a predetermined position, said dose setting sleeve releases said mechanical interlock and places said resettable dose setting mechanism in a reset condition. - View Dependent Claims (10, 11, 12)
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Specification