Patent ID: 9707351
Date: 2017-07-18
CPC Classifications: A61M

Claim:
1. A dose setting mechanism for a drug delivery device, the mechanism comprising: a drug delivery device housing; a dose dial sleeve positioned at least partly in the housing and is rotatable during dose setting and dose delivery, a clutch rotatable during dose setting and non-rotatable during dose delivery; and a clutch nut, that is threadedly engaged with the clutch and is splined to the housing to prevent rotation of the clutch nut, wherein the clutch nut is fixed to the dose dial sleeve from a dose of 0 to a predetermined minimum dose by means of interacting splines or by means of a one-directional coupling or ratchet and is disengaged from the dose dial sleeve when a dose greater than the predetermined minimum dose is set, wherein the dose dial sleeve is non-rotatable and locked from movement in a distal direction during attempted dose delivery if the set dose is from 0 to less than a predetermined minimum dose.