Medicament delivery device comprising: which extends along a longitudinal axis and comprises: a generally tubular elongated housing having a proximal and a distal end, which generally tubular elongated housing is arranged to accommodate a medicament container (28) a drive unit comprising a drive element (116) and plunger rod (68) operably arranged to act on said medicament container (28) a tubular element (72) rotatable arranged in relation to said housing and operably arranged to said plunger rod (68). The invention is characterised in thatthe plunger rod comprises at least one holding member (80) and in that the tubular element (72) comprises at least one arm (78) extending generally transversal to the longitudinal axis of the device, wherein the at least one arm (78) is arranged to engage the at least one holding member (80) on said plunger rod (68) to releasable hold said drive unit in an energy accumulated state.藥物輸送裝置包含:其沿著縱軸延伸,且包含:大致上管狀細長的外殼,具有近側端與遠側端,其大致上管狀細長外殼被配置來容納藥物容器(28);驅動器單元,包含可操作地配置來作用於該藥物容器(28)上之驅動元件(116)及柱塞桿(68);管狀元件(72),關於該外殼可旋轉地配置,並可操作地配置至該柱塞桿(68)。本發明的特徵在於該柱塞桿包含至少一固持構件(80),且其中該管狀元件(72)包含大致上橫向於該裝置的縱軸延伸之至少一支臂(78),其中該至少一支臂(78)被配置來嚙合該柱塞桿(68)上之至少一固持構件(80),以於蓄能狀態中可釋放地固持該驅動器單元。10‧‧‧近側外殼零件12‧‧‧近側端14‧‧‧遠側端16‧‧‧通道18‧‧‧啟動器28‧‧‧藥物容器32‧‧‧藥物輸送構件屏蔽件34‧‧‧藥物容器夾具58‧‧‧安全蓋子60‧‧‧管狀本體62‧‧‧凸耳68‧‧‧柱塞桿72‧‧‧管狀元件98‧‧‧遠側外殼零件110‧‧‧切口114‧‧‧切口116‧‧‧驅動元件
