Drive mechanisms suitable for use in drug delivery devices
First Claim
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1. A drive mechanism for use in a drug delivery device comprising an epicyclic gearbox.
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Abstract
A drive mechanism for use in a drug delivery device comprising an epicyclic gearbox. This drive mechanism includes a housing having a helical thread; a piston rod having a non-circular cross section and an external helical thread; a dose dial sleeve, which is threadedly engaged with the housing and being rotatable with respect to the housing; and a drive sleeve, located between the housing and the piston rod, which is threadedly engaged with the piston rod.
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Citations
7 Claims
- 1. A drive mechanism for use in a drug delivery device comprising an epicyclic gearbox.
Specification