Patent ID: 9687613
Date: 2017-06-27
CPC Classifications: A61M

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