Drug delivery device

摘要

A drive mechanism for a drug delivery device is presented having a housing, an axially displaceable piston rod to act on a piston of a cartridge containing a medicinal product to be dispensed, a drive member threadedly engaged with the piston rod and being slidably disposed relative to the housing between a distal stop position and a proximal stop position. During the setting of a dose the drive member is rotatable with respect to the housing and a dose dial member is operably engaged with the drive member by means of a reduction gear, wherein the drive member at its proximal end section comprises a radially extending receptacle adapted to receive the reduction gear.

主权项

1. A drive mechanism for a drug delivery device, comprising:
a housing; an axially displaceable piston rod to act on a piston of a cartridge containing a medicinal product to be dispensed; a drive member threadedly engaged with the piston rod and being slidably disposed and displaceable relative to the housing between a distal stop position and a proximal stop position, and comprising at its proximal end section a radially extending receptacle adapted to receive a reduction gear, where the reduction gear is exclusively operable to reduce the displacement of the drive member during dose setting and during dose dispensing the reduction gear is deactivated; and a dose dial member operably engaged with the drive member by means of the reduction gear, for transferring a dose setting rotative movement of the dose dial member at a lower rate of rotation to the drive member being rotatable with respect to the housing for setting of a dose.