Assembly for a drug delivery device and drug delivery device

摘要

An assembly for a drug delivery device comprises a housing, at least one stop feature and at least one blocking member. For setting a dose of a drug, the stop feature is configured to be rotated in a dose setting direction with respect to the blocking member and with respect to the housing. For delivering the set dose of the drug, the blocking member is configured to be axially displaced with respect to the stop feature away from an axial starting position and towards an axial interaction position. When the blocking member is in the axial starting position, the blocking member is axially offset from the stop feature and, when the blocking member is in the axial interaction position, the blocking member is configured to mechanically cooperate with the stop feature such that rotation of the stop feature in the dose setting direction with respect to the housing is prevented.

主权项

1. An assembly for a drug delivery device, comprising:
a housing, at least one stop feature, at least one blocking member, a piston rod configured to be axially displaced with respect to the housing for delivering a dose of a drug, wherein blocking member is part of the piston rod, a rotation member, wherein the stop feature is part of the rotation member and wherein the rotation member is configured to rotate in a dose setting direction with respect to the housing for setting a dose of the drug and to rotate in a dose delivery direction with respect to the housing for delivering the set dose of the drug, and a rigid drive member which is adapted to follow rotational movement of the rotation member in the dose delivery direction with respect to the housing by mechanical interaction with the rotation member, wherein the rigid drive member and the piston rod are rotationally locked with each other, wherein for setting the dose of the drug, the stop feature is configured to be rotated in the dose setting direction with respect to the blocking member and with respect to the housing and, for delivering the set dose of the drug, the blocking member is configured to be axially displaced with respect to the stop feature away from an axial starting position and towards an axial interaction position, wherein, when the blocking member is in the axial starting position, the blocking member is axially offset from the stop feature and, when the blocking member is in the axial interaction position, the blocking member is configured to mechanically cooperate with the stop feature such that rotation of the stop feature in the dose setting direction with respect to the housing is prevented, wherein the assembly comprises a stop member rotationally fixed to the housing that prevents rotational movement of the rigid drive member by engagement of a unidirectional clutch in the dose setting direction with respect to the housing by mechanical cooperation with the rigid drive member when the rotation member is rotated in the dose setting direction with respect to the housing.