Described is an autoinjector (1) comprising a case (2) adapted to hold a medicament container having a needle (4), a needle shroud (7) telescopically coupled to the case (2) and movable between a first extended position (FEP) relative to the case (2) in which the needle (4) is covered, and a retracted position (RP) relative to the case (2) in which the needle (4) is exposed, and a second extended position (SEP) relative to the case (2) in which the needle (4) is covered and the needle shroud (7) cannot translate relative to the case (2), and a plunger (10) slidably disposed in the case (2) and movable between a proximal position, an intermediate position and a distal position relative to the case (2). When the plunger (10) is in the intermediate position and the needle shroud (7) is in the retracted position (RP), the plunger (10) abuts the case (2) to prevent the needle shroud (7) from returning to the extended position (EP). When the plunger (10) is in the distal position and the needle shroud (7) is in the second extended position (SEP), the plunger (10) abuts the case (2) to prevent the needle shroud (7) from returning to the retracted position (RP).描述一種自動注射器(1)，其係包括：適於保持有一針(4)之一藥劑容器的一外殼(2)；一針罩(7)，其係可伸縮地耦合至該外殼(2)以及相對於該外殼(2)可在該針(4)被蓋住的一第一伸出位置(FEP)、該針(4)露出的一縮回位置(RP)、和該針(4)被蓋住而且該針罩(7)相對於該外殼(2)無法平移的一第二伸出位置(SEP)之間移動；以及一柱塞(10)，其係可滑動地配置於該外殼(2)中以及相對於該外殼(2)可在一近端位置、一中間位置及一遠端位置之間移動。當該柱塞(10)處於該中間位置以及該針罩(7)處於該縮回位置(RP)時，該柱塞(10)抵接該外殼(2)以防該針罩(7)回到該伸出位置(EP)。當該柱塞(10)處於該遠端位置以及該針罩(7)處於該第二伸出位置(SEP)時，該柱塞(10)抵接該外殼(2)以防該針罩(7)回到該縮回位置(RP)。
