The invention relates to a medicament delivery device comprising a housing arranged to receive a medicament container (20), a drive unit (25) arranged to act on a stopper (27) in said medicament container (20), which drive unit (25) comprises a torsion drive spring (50). A dose setting member (56) is operably connected to said drive unit (25) such that a manual turning of said dose setting member (56) causes a tensioning of said torsion drive spring (50). The device further comprises an activation mechanism (76) having an activation button (94) protruding through the distal end of the device, wherein said activation mechanism (76) is operably connected to said drive unit (25) such that actuation of said activation mechanism (76) causes a release of said drive unit (25) whereby a set dose of medicament is delivered.本發明係關於一種藥物輸送裝置包括一外殼用來接收一藥物容器(20)，一驅動單元(25)用來作用於該藥物容器(20)內的一瓶塞(27)上，該驅動單元(25)包括一扭力驅動彈簧(50)。一劑量設定構件(56)可操作地連接於該驅動單元(25)以致該劑量設定構件(56)的一互轉造成該扭力驅動彈簧(50)拉緊。該裝置又包括一致動機制(76)有一致動鈕(94)從該裝置的末端突出，其中該致動機制(76)可操作地連接於該驅動單元(25)以致該致動機制(76)的致動造成該驅動單元(25)鬆開，因此一設定藥物劑量被輸送。
