| 摘要 |
<p>The invention relates to a drive mechanism for use in a drug delivery device comprising an epicyclic gearbox. This drive mechanism can comprise a housing (2) having a helical thread; a piston rod (20) having a non-circular cross section and an external helical thread; a dose dial sleeve (30), which is threadedly engaged with said housing and being rotatable with respect to said housing; a drive sleeve (50), located between said housing and said piston rod, which is threadedly engaged with said piston rod.</p> |
