Drive mechanisms suitable for use in drug delivery devices

摘要

A drive mechanism suitable for use in drug delivery devices is disclosed. The drive mechanism may be used with injector-type drug delivery devices, such as those permitting a user to set the delivery dose. The drive mechanism may include a housing, a dose dial sleeve, and a drive sleeve. A clutch is configured to permit rotation of the drive sleeve and the dose dial sleeve with respect to the housing when the dose dial sleeve and drive sleeve are coupled through the clutch. Conversely, when the dose dial sleeve and drive sleeve are in a de-coupled state, rotation of the dose dial sleeve with respect to the housing is permitted and rotation of the drive sleeve with respect to the housing is prevented. In the de-coupled state, axial movement of the drive sleeve transfers force in a longitudinal direction for actuation of a drug delivery device.

主权项

1. A drive mechanism for use in a drug delivery device comprising:
a housing; a dose dial sleeve having a first end, a second end, and an outer surface, where the outer surface has a helical thread engaged with the housing, and the second end has an inwardly directed flange; a dose dial grip connected and rotationally fixed to the second end through connection with the inwardly directed flange; a drive sleeve releasably connected to the dose dial sleeve; a piston rod engaged with the drive sleeve; and a clutch located between the dose dial sleeve and the drive sleeve.