Resettable drug delivery device
First Claim
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1. A resettable dosing mechanism, wherein said dosing mechanism is removably connectable to a cartridge holder, said dosing mechanism comprising:
- a dose button;
a dial grip operatively coupled to said dose button, said dial grip rotatable to set a dose;
a spindle for acting on a bung of a cartridge; and
a driver operatively coupled to said dose button and said spindle, wherein during an injection of said dose, said dose button moves in an axial direction to cause said spindle to administer said dose, anda resetting mechanism for resetting of said dosing mechanism by retracting back said spindle into said dosing mechanism, wherein during said injection of said dose, said spindle rotates while advancing in said distal direction and wherein said dial grip must be moved axially in order to activate said resetting mechanism, wherein said dial grip must be pulled in a proximal direction in order to activate said resetting mechanism in order to retract said spindle back into said dosing mechanism.
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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
10 Claims
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1. A resettable dosing mechanism, wherein said dosing mechanism is removably connectable to a cartridge holder, said dosing mechanism comprising:
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a dose button; a dial grip operatively coupled to said dose button, said dial grip rotatable to set a dose; a spindle for acting on a bung of a cartridge; and a driver operatively coupled to said dose button and said spindle, wherein during an injection of said dose, said dose button moves in an axial direction to cause said spindle to administer said dose, and a resetting mechanism for resetting of said dosing mechanism by retracting back said spindle into said dosing mechanism, wherein during said injection of said dose, said spindle rotates while advancing in said distal direction and wherein said dial grip must be moved axially in order to activate said resetting mechanism, wherein said dial grip must be pulled in a proximal direction in order to activate said resetting mechanism in order to retract said spindle back into said dosing mechanism. - View Dependent Claims (2, 3)
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4. A resettable drug delivery device comprising:
a resettable dosing mechanism, wherein said dosing mechanism is removably connectable to a cartridge holder, said dosing mechanism comprising; a dose button; a dial grip operatively coupled to said dose button, said dial grip rotatable to set a dose; a spindle for acting on a bung of a cartridge; and a driver operatively coupled to said dose button and said spindle, wherein during an injection of said dose, said dose button moves in an axial direction to cause said spindle to administer said dose, a resetting mechanism for resetting of said dosing mechanism by retracting back said spindle into said dosing mechanism, wherein during said injection of said dose, said spindle rotates while advancing in said distal direction and wherein said dial grip must be moved axially in order to activate said resetting mechanism, an inner housing having at least one helical groove; a dose dial sleeve rotationally engaged with the at least one helical groove of said inner housing; a first clutch provided between said dose dial sleeve and said driver; and a second clutch between said inner housing and said driver; wherein when a dose is set with said dosing mechanism, said first clutch engages said dose dial sleeve and said driver to rotate together relative to said inner 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 inner housing, allowing said driver to be moved to a reset position. - View Dependent Claims (5, 6, 7, 8, 9, 10)
Specification