MEDICAMENT DELIVERY DEVICE

摘要

A dose setting mechanism for a medicament delivery device is presented having a pinion mounted to a locking member where the axis of rotation of the pinion is offset and parallel to the longitudinal axis of the housing containing the dose setting components. Primary and secondary dose members are engaged with the pinion to indicate a set dose of medicament. A resetting mechanism is also presented where nut segments are radially and

主权项

1. A plunger rod resetting mechanism for a drug delivery device comprising,
a) a housing having an outer surface on a proximal end configured to allow removable attachment of a cartridge holder through engagement of a snap fit connector on the outer surface; b) a locking shell positioned inside the housing and having a radial projecting pin protruding through the outer surface of the housing, where the locking shell is rotatable relative to the housing and configured to engage the cartridge holder during attachment to the housing; c) a lock pin rotationally fixed to the housing and having a stop projecting through the outer surface of the housing and slidable in the distal direction from an unlocked to a locked position where the stop prevents removal of the cartridge holder from the housing; d) a biasing member that exerts a distal force on the lock pin to move the stop from the unlocked to the locked position; e) a transfer ring rotationally fixed to and axially slidable to the locking shell; f) a cam nut engaged with the transfer ring through a cam that allows the transfer ring to rotate and move axially relative to the cam nut; g) a push pin axially fixed to the transfer ring; and h) a nut segment slidably connected to the push pin through a cam, where the nut segment is configured to move from a locked position to an unlocked position.