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 drug delivery device that allows reducing an inadvertently set dose comprising:
a housing; a drive mechanism; and a cartridge containing a medicinal product,wherein the drive mechanism comprises,
a dose dial sleeve threadedly engaged with the housing; a dose dial grip rotationally fixed to the dose dial sleeve and configured to rotate in a first direction to increase a set dose and in a second direction to reduce a set dose without dispense of the medicinal product from the cartridge and a drive sleeve rotationally fixed to a clutch and releasably connected to the dose dial sleeve, wherein the clutch and the dose dial sleeve rotate with the dose dial grip when a dose is being increased and when a dose is being decreased.