The present invention relates to a medicament delivery device comprising an elongated housing (10) extending in a longitudinal direction, which housing (10) is arranged to accommodate a medicament container (16), an end cap (52) arranged with a first attachment element (98, 100) designed to engage with a second attachment element (102) on said housing for attaching said end cap (52) to said housing (10), a rotator (62) rotatably arranged inside said housing (10), an activator (32) axially slidable with respect to the housing from an extended position to a retracted position and operably connected to said rotator (62) such as to rotate said rotator (62) from an initial non-activated rotational position and an activated rotational position when the activator (32) is moved from the extended to the retracted position, said rotator (62) further comprises a blocking element (76) arranged to cooperate with said first attachment element (98, 100) for preventing disengagement of said first attachment element (98, 100) from said second attachment element (102) when the rotator (62) is in the activated rotational position.本發明有關藥物輸送裝置，包含在縱向中延伸的修長外殼(10)，該外殼(10)被配置來容納藥物容器(16)；端蓋(52)，配置有第一附接元件(98、100)，其被設計來與該外殼上之第二附接元件(102)嚙合，用於將該端蓋(52)附接至該外殼(10)；轉子(62)，可旋轉地配置在該外殼(10)內側；啟動器(32)，可相對於該外殼由延伸位置軸向地滑動至縮回位置，並可操作地連接至該轉子(62)，以便當該啟動器(32)係由該延伸位置運動至該縮回位置時，由最初的非啟動旋轉位置及啟動旋轉位置旋轉該轉子(62)；該轉子(62)另包含被配置成與該第一附接元件(98、100)配合之阻擋元件(76)，用於當該轉子(62)係在該啟動旋轉位置中時，防止該第一附接元件(98、100)由該第二附接元件(102)脫開。
