Patent ID: 8968258
Filing Date: 2015-03-03
Classification: A61M

Abstract:
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 drive mechanism further comprises a rotation member adapted to be rotated in the first direction with respect to the housing during setting of a dose of a medication and to be rotated in the second direction with respect to the housing during delivery of the dose, wherein the rotation member and the drive member are engaged to form a uni-directional friction clutch mechanism when the clutch member is in the delivery position, said mechanism being configured to prevent relative rotational movement between rotation member and drive member when the rotation member rotates in the second direction.