| 摘要 |
The invention relates to a drive mechanism for use in a re-usable drug delivery device is provided comprising:
a housing (4', 16') comprising an inner body (16') having a helical thread;
a dose dial sleeve (70') having a helical thread engaged with the helical thread of the said housing (4', 16');
a drive sleeve (30') releasibly connected to the said dose dial sleeve (70');
and a clutch means (60') located between the dose dial sleeve (70') and the drive sleeve (30'). When the dose dial sleeve (70') and the drive sleeve (30') are coupled, the dose dial sleeve and the drive sleeve are allowed to rotate with respect to the housing (4', 16'). When the dose dial sleeve (70') and the drive sleeve (30') are de-coupled, rotation of the dose dial sleeve with respect to the housing (4', 16') is allowed, whilst rotation of the drive sleeve with respect to the housing is not allowed, whereby axial movement of the drive sleeve is allowed so that a force is transferred in the longitudinal direction to the proximal end of the drug delivery device. |
