Patent ID: 9700678
Date: 2017-07-11
CPC Classifications: A61M,F16H,Y10T

Claim:
1. A drive assembly for a drug delivery device, the drive assembly comprising: a housing having a proximal end and a distal end, a rotation member being configured to be rotated in a first direction with respect to the housing during setting of a dose of a drug and to be rotated in a second direction with respect to the housing during delivery of the dose, the second direction being opposite to the first direction, a drive component being configured to follow rotational movement of the rotation member in the second direction during delivery of the dose, a stop member being configured to prevent rotational movement of the drive component in the first direction with respect to the housing, wherein the drive component comprises a first drive part and a second drive part, coupled to each other such that relative rotational movement of the first and second drive parts is prevented and relative axial movement is permitted, wherein the first drive part is configured for engagement with the rotation member, the stop member being secured against both axial and rotational movements with respect to the housing, and the stop member being configured to permit rotational movement of the drive component in the second direction with respect to the housing, wherein the stop member and the drive component are permanently coupled to one another by a uni-directional clutch mechanism, wherein the uni-directional clutch mechanism prevents rotational movement of the drive component with respect to the stop member when the rotation member rotates in the first direction, and wherein the uni-directional clutch mechanism permits rotational movement of the drive component with respect to the stop member when the rotation member rotates in the second direction.