Patent ID: 9662454
Date: 2017-05-30
CPC Classifications: A61M

Claim:
1. A resettable dose setting mechanism for a drug delivery device comprising: a spindle; a rotating sleeve in rotatable engagement with respect to housing; and a driver for driving the spindle of the drug delivery device in a distal direction to cause a distal end of the spindle to act on a bung within a cartridge, wherein said driver comprises a first component and a second component rotationally coupled to said first component, wherein during resetting of said drug delivery device, said first component is decoupled from said second component such that the first component can rotate relative to the second component causing the spindle to retract axially in a proximal direction, wherein during a dose setting operation a user rotates the rotating sleeve causing the first component and the second component of the driver to rotate together, wherein the resettable dose setting mechanism is designed such that the first component and the second component remain locked together rotationally during the dose setting operation as well as during dose administration and wherein during the dose setting operation the first and second components are coupled together to rotate together in unison relative to the housing and the spindle causing the driver to move axially in the proximal direction when the user dials a dose of medicament for administration.