The present invention relates to an automatic injection training device (1) comprising an elongated housing assembly and a demo container (19) wherein the device further comprises a reloadable plunger assembly comprising a hollow plunger (10), a piston rod (12), a first energy accumulating member (11) arranged between the hollow plunger (10) and the piston rod (12) and an actuation assembly configured to hold the hollow plunger (10) in a first position and thereby the piston rod (12) in the start position and to release the hollow plunger (10) from the first position and thereby the piston rod (12) from the start position and wherein the hollow plunger (10) comprises a chamber (110) sealed by the piston rod (12), and a passage (101) such that movement of the hollow plunger (10) from the first to the second position by a force exerted from the first energy accumulating member causes an airflow into the chamber (110) through the passage (101) whereby the movement of the hollow plunger (10) is damped.本發明有關自動注射訓練裝置(1),包含細長的外殼組件及展示容器(19),其中該裝置另包含可重新載入之柱塞組件,包含中空柱塞(10)、柱塞桿(12)、被配置於該中空柱塞(10)及該柱塞桿(12)間之第一蓄能構件(11)、及致動組件,該致動組件被建構來將該中空柱塞(10)固持於第一位置中,且藉此將該柱塞桿(12)固持於該開始位置中,並由該第一位置釋放該中空柱塞(10)及藉此由該開始位置釋放該柱塞桿(12);及其中該中空柱塞(10)包含藉由該柱塞桿(12)所密封之室(110)、及通道(101);使得該中空柱塞(10)藉由該第一蓄能構件所施加的力量而從該第一位置至該第二位置之運動,造成氣流經過該通道(101)進入該室(110),由此該中空柱塞(10)的運動被阻尼。2‧‧‧外殼6‧‧‧針蓋10‧‧‧中空柱塞11‧‧‧第一蓄能構件12‧‧‧柱塞桿13‧‧‧塞子14‧‧‧密封構件16‧‧‧致動器17‧‧‧致動器套筒18‧‧‧第三蓄能構件19‧‧‧展示容器20‧‧‧可移去蓋子21‧‧‧遠側蓋子23‧‧‧第二蓄能構件24‧‧‧緊鄰表面25‧‧‧第四蓄能構件71‧‧‧軸桿構件101‧‧‧通道110‧‧‧室120‧‧‧溝槽160‧‧‧凸緣
