The present invention relates to a medicament delivery device (100) comprising a proximal sub-assembly (150, 250) and a distal sub-assembly (350) configured to be connected to each other, wherein the proximal sub-assembly comprises a key member (161) and wherein the distal sub-assembly comprises a power pack unit having a transport lock mechanism for transport locking said power pack unit such that unintentional activation of said power pack unit during transportation is avoided, and wherein said key member is configured to interact with said lock mechanism during assembling of said proximal and distal sub-assemblies such that said transport lock is released.本發明有關藥物輸送裝置(100)，包括被建構成連接至彼此之近側次組件(150、250)與遠側次組件(350)，其中該近側次組件包括鑰匙構件(161)，且其中該遠側次組件包括具有一用於運送鎖定該動力封包單元的運送鎖機件之動力封包單元，使得該動力封包單元在運送期間的無意中之啟動被避免，及其中該鑰匙構件被建構成於該近側及遠側次組件的組裝期間與該鎖機件互相作用，使得該運送鎖被釋放。
