Resettable drive mechanism for a medication delivery device and medication delivery device

摘要

A resettable drive mechanism for a medication delivery device comprising a housing, a drive member rotatable with respect to the housing in a second direction for delivering a dose of a medication, and a piston rod by the drive member, when drive member rotates in the second direction, a stop member adapted to prevent rotation of drive member in a first direction, when the stop member engages the drive member, a clutch member movable between a delivery position and a reset position. When clutch member is in the delivery position, stop member and drive member are engaged and drive member is prevented from rotation in the first direction, and when the clutch member is in the reset position, the drive member and the stop member are disengaged, the drive member is rotatable in the first direction.

主权项

1. A resettable drive mechanism for a medication delivery device, comprising:
a housing with a proximal end and a distal end, a drive member rotatable with respect to the housing in a second direction for delivering a dose of a medication, a piston rod adapted to be driven in a distal direction with respect to the housing by the drive member, when the drive member rotates in the second direction, a stop member adapted to prevent rotation of the drive member in a first direction opposite to the second direction with respect to the housing, when the stop member engages the drive member, and a clutch member movable with respect to the housing between a delivery position and a reset position, wherein, when the clutch member is in the delivery position, the stop member and the drive member are engaged and the drive member is prevented from rotating in the first direction with respect to the housing, and when the clutch member is in the reset position, the drive member and the stop member are disengaged, the drive member is rotatable in the first direction with respect to the housing and the piston rod is movable in the proximal direction with respect to the housing, wherein the resettable drive mechanism has at least one of the following configurations:
the drive member and the stop member being engaged to form a uni-directional friction clutch mechanism when the clutch member is in the delivery position; andthe stop member being secured against rotational movement with respect to the housing and the stop member being displaceable with respect to the housing.