The present invention relates to a medicament delivery device comprising a housing (12, 14), which housing (12, 14) is arranged to accommodate a medicament container (18), a drive unit (26) operably arranged to act on said medicament container (18) for expelling a dose of medicament, the drive unit comprising a plunger rod (28), a force element (32) operably connected to said plunger rod (28), a connector (40) arranged to releasibly hold said plunger rod, an actuator element (66) operably arranged to said connector (40) and a manually operable actuator (68) arranged to act on said actuator element (66) for releasing said connector (40) when operated. The invention is characterised in a safety device (54) arranged to releasibly hold said actuator element (66) in a locking position with said connector (40), preventing unintended release of said plunger rod (28).本發明有關藥物輸送裝置，包括外殼(12、14)，該外殼(12、14)被配置來容納藥物容器(18)；驅動單元(26)，可操作地配置來作用於該藥物容器(18)上，用於排出一劑量的藥物；該驅動單元包括柱塞桿(28)；力量元件(32)，可操作地連接至該柱塞桿(28)；連接器(40)，被配置成可釋放地固持該柱塞桿；致動器元件(66)，可操作地配置至該連接器(40)；及可手動操作之致動器(68)，被配置來作用於該致動器元件(66)上，用於當操作時釋放該連接器(40)。本發明的特徵在於安全裝置(54)被配置來以該連接器(40)將該致動器元件(66)可釋放地固持於鎖定位置中，防止該柱塞桿(28)之無意中釋放。
