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 comprising a window at a distal end of the housing, where the window has a maximum dose stop; a dose dial sleeve being rotatable with respect to the housing and having a radial stop extending radially outward from an outer surface of the dose dial sleeve, the radial stop configured to engage the maximum dose stop; a drive sleeve; and a piston rod engaged with the drive sleeve.