| 摘要 |
The present invention relates to an auto-injection device comprising a rear housing and a container housing; a medicament container disposed within the container housing; a dose setting mechanism capable of setting and resetting a dose of medicament; a drive nut 18 operably connected to the dose setting mechanism; wherein said device further comprises a hollow plunger rod rotatably connected to said drive nut; an energy accumulating member operably connected to the dose setting mechanism; an activating mechanism; a positioning mechanism operably connected to said hollow plunger rod and capable of locking said hollow plunger rod from being resiliently and axially displaced by rotation; wherein said positioning mechanism comprises a first locking nut rotationally locked but axially slidable surrounding said hollow plunger rod and arranged to co-operate with flexible locking means arranged on said rear housing for locking said first locking nut from rotation; and a resilient member arranged inside said hollow plunger rod capable of allowing said hollow plunger rod to be resiliently and axially displaced when said first locking nut is unlocked.
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