Resettable drive mechanism of the drug delivery device (1) for comprises a (23) and interacting member (32) the piston rod assembly. Piston rod assembly (32), and a (18) and the guide track that follows along the (32) piston rod assembly, the guide track (18), and at least (18A) at least a delivery section of one reset one section (18B) I comprises. Reset section (18B) is arranged so as to follow the (18A) delivery section. Delivery Section (18A) includes (19) blocking at least one means. Interaction member (23) is configured to cooperate (18) and the guide track. In order to deliver a dose of drug (24), the piston rod assembly (32) is axially displaceable in the delivery direction of the dose away from the axis starting position, the interaction member (23) delivery section (18A When (32) is displaced in the dose delivery direction piston rod assembly, blocking means and, in cooperation with) (19), passes through interaction member (23). When (23) cooperates delivery section and (18A) interacting member, the displacement towards the axial starting position the piston rod assembly (32), mechanical interaction interaction member (19) blocking means (23) It is blocked by. To reset the (1) a drug delivery device, the interaction member (23), and is configured to cooperate with (18B) reset section, the piston rod assembly (32), axially towards the axis start position The displaced, blocking means (19), when (32) is displaced toward the axial starting position the piston rod assembly and is offset through the axis position interaction member (23) from (23) interacting member to. Also, the piston rod assembly (32) is proposed. [Selection Figure Figure 3薬物送達デバイス(1)用のリセット可能な駆動機構は、ピストンロッドアセンブリ(32)及び相互作用部材(23)を含む。ピストンロッドアセンブリ(32)は、ピストンロッドアセンブリ(32)に沿って続くガイドトラック(18)を含み、ガイドトラック(18)は、少なくとも一つの送達セクション(18A)及び少なくとも一つのリセットセクション(18B)を含んでなる。リセットセクション(18B)は、送達セクション(18A)に続くように配置される。送達セクション(18A)は、少なくとも一つのブロッキング手段(19)を含む。相互作用部材(23)は、ガイドトラック(18)と協動するように構成される。薬物(24)の用量を送達するために、ピストンロッドアセンブリ(32
