Drive assembly for a drug delivery device and drug delivery device

摘要

A drive assembly for a drug delivery device, comprising a housing with a proximal end and a distal end, and a longitudinal axis (A) extending between the proximal end and the distal end, a rotation sleeve being rotatable relative to the housing, and a piston rod being axially moveable relative to the housing. The piston rod is in mechanical cooperation with the rotation sleeve to be rotatable and moveable in the distal direction relative to the housing when the rotation sleeve rotates in a first direction (D1) and to be stationary in axial direction relative to the housing when the rotation sleeve rotates in a second direction (D2) opposite to the first direction (D1).

主权项

1. A drive assembly for a drug delivery device, comprising:
a housing with a proximal end and a distal end, and a longitudinal axis (A) extending between the proximal end and the distal end, a rotation sleeve being rotatable relative to the housing, a drive member is axially moveable relative to the housing, and a piston rod being axially moveable relative to the housing, wherein the piston rod is in mechanical cooperation with the rotation sleeve to be moveable in the distal direction relative to the housing when the rotation sleeve rotates in a first direction (D1) and to be stationary in axial direction relative to the housing when the rotation sleeve rotates in a second direction (D2) opposite to the first direction (D1), wherein the rotation sleeve is in mechanical cooperation with the drive member to be rotatable relative to the housing when the drive member is displaced in axial direction relative to the rotation sleeve.