Dose setting mechanism and method of setting a dose

摘要

A dose setting mechanism (200) comprises a drug delivery device housing (250) and a dual state track (262) provided within the housing that is axially and rotationally fixed with respect to the housing. A dose dial component (204) is positioned in the housing and rotatable during dose setting and dose delivery. A clutch (208) is rotatable during dose setting and non-rotatable during dose delivery. A clutch plate (212) is rotationally fixed relative to the housing; and a clutch blocker (220) is in threaded engagement with the clutch plate and has a radial key (222) engaged with the dual state track. The mechanism may comprise a biasing member (216) positioned between the clutch blocker and clutch plate.