Describe 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 plunger (10) rotationally and slidably disposed in the case (2). The plunger (10) is rotatable relative to the case (2) between a first rotational position in which the plunger (10) is engaged to the case (2) and a second rotational position in which the plunger (10) disengages the case (2). The needle shroud (7) is operably coupled to the plunger (10). When the needle shroud (7) translates from the first extended position (FEP) to the retracted position (RP), the plunger (10) rotates from the first rotational position to the second rotational position.描述一種自動注射器(1)，其係包括：一適合保持具有一針(4)之一藥劑容器的外殼(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)及該針(4)露出的一縮回位置(RP)之間移動，以及一可旋轉及可滑動地配置於該外殼(2)中的柱塞(10)。該柱塞(10)相對於該外殼(2)可在該柱塞(10)接合至該外殼(2)的一第一旋轉位置、該柱塞(10)脫離該外殼(2)的一第二旋轉位置之間旋轉。該針罩(7)可操作地耦合至該柱塞(10)。當該針罩(7)由該第一伸出位置(FEP)平移至該縮回位置(RP)時，該柱塞(10)由該第一旋轉位置旋轉到該第二旋轉位置。
