Patent ID: 9610409
Date: 2017-04-04
CPC Classifications: A61M

Claim:
1. A drive mechanism for use in a drug delivery device comprising: a housing comprising an inner surface having longitudinal splines; a dose dial sleeve threadedly engaged with the housing; a drive sleeve having an outer surface and releasably connected to the dose dial sleeve, where a proximal end of the drive sleeve comprises a distal and a proximal radially extending flange where threads are disposed on the outer surface between the flanges; and an end of life nut threadedly engaged with the threads on the outer surface of the drive sleeve between the two radially extending flanges, where the end of life nut has an outer surface configured to engage the splines on the inner surface of the housing to prevent rotation of the end of life nut relative to the housing and the drive sleeve, and where the end of life nut translates distally relative to the drive sleeve during dose setting and is axially fixed relative to the drive sleeve during dose delivery.