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US 8,911,411 B2Granted
Injection device
AssigneeNovo Nordisk A/S
InventorLars Ulrik Nielsen
Life of this patent
Estimating the term…
Abstract
An injection device with a travelling clutch which can be shifted between two different positions by the activation of an injection button. In the first position, the injection button and the driver is allowed to rotate relatively to the piston rod, which is blocked from rotation by the clicker element. In the second position, the drive sleeve and the injection button is axially movable while the piston rod is allowed to rotate.
Claims7
A drug delivery device comprising:
- a housing,
- a piston rod having a first thread and a second thread,
- a nut member disposed within the housing, and which has an inner thread mating the first or second thread of the piston rod such that the piston rod is screwed in a distal direction when rotated relatively to the nut member,
- a drive sleeve which has an inner thread mating the first or second thread of the piston rod such that the piston rod is rotated when the drive sleeve is axially moved relatively to the piston rod,
- wherein a releasable coupling is movable between a first position and a second position to secure the piston rod, against rotation during dose setting in the first position but during dose administration allows the piston rod to rotate and thus axially translate to expel a drug from the device in the second position,
- wherein the releasable coupling is provided between the piston rod and the drive sleeve.
3 more elements
Dependencies are inferred from the claim text.