Herein a medicament delivery device (2) is disclosed. The device (2) comprises a housing (4), a container holder (14) arranged in the housing (4), an axially movable plunger (16), and an energy accumulating member (18) adapted for displacing the plunger (16). The container holder (14) is adapted to accommodate a medicament container (20) comprising a first piston (24) sealingly and slidably arranged inside an opposite end portion of the medicament container (20), and a second piston (26) slidably arranged inside an intermediate portion of the medicament container (20). The plunger (16) comprises an outer plunger rod (32), an inner plunger rod (34) arranged at least partially inside the outer plunger rod (32), a biasing arrangement (36) for actuating the inner plunger rod (34), and a locking arrangement (35). The locking arrangement (35), in a first state, is arranged to lock the biasing arrangement (36) in an energy storing position and, in a second state, is arranged to release the biasing arrangement (36) from the energy storing position to displace the inner plunger rod (34) into the container holder (14).在此中,藥物輸送裝置(2)被揭示。該裝置(2)包含外殼(4);容器夾具(14),被配置於該外殼(4)中;可軸向運動柱塞(16);及蓄能構件(18),被設計成適用於位移該柱塞(16)。該容器夾具(14)被設計成適於容納藥物容器(20),其包含密封式及可滑動地配置在該藥物容器(20)之相反端部內側的第一活塞(24)、和可滑動地配置在該藥物容器(20)之中間部分內側的第二活塞(26)。該柱塞(16)包含外部柱塞桿(32)、至少局部地配置在該外部柱塞桿(32)內側的內部柱塞桿(34)、用於作動該內部柱塞桿(34)之偏向配置(36)、及鎖定配置(35)。該鎖定配置(35)在第一狀態中被配置成將該偏向配置(36)鎖定於能量儲存位置中,及在第二狀態中被配置成由該能量儲存位置釋放該偏向配置(36),以位移該內部柱塞桿(34)進入該容器夾具(14)。2‧‧‧藥物輸送裝置6‧‧‧縱軸8‧‧‧近側端部分10‧‧‧遠側端部分14‧‧‧容器夾具16‧‧‧柱塞18‧‧‧蓄能構件19‧‧‧扭轉彈簧20‧‧‧藥物容器22‧‧‧藥物輸送構件23‧‧‧針24‧‧‧活塞26‧‧‧活塞28‧‧‧空間30‧‧‧空間32‧‧‧柱塞桿34‧‧‧柱塞桿35‧‧‧鎖定配置36‧‧‧偏向配置38‧‧‧壓縮彈簧52‧‧‧突出部分54‧‧‧固定式構件56‧‧‧內表面58‧‧‧外表面65‧‧‧凹部
