A drive mechanism for a delivery device comprising, a rotator comprising an outer surface and an inner surface, the rotator configured to rotate from a first position to a second position. A needle cover comprising an inner surface that engages the outer surface of the rotator. A rotatable plunger rod comprising an outer surface configured to engage the inner surface of the rotator. When the rotator rotates from the first position to the second position, the rotatable plunger rod is rotated by the rotator and a plunger rod spring is released from a pre-tensioned state to exert a force on the rotatable plunger rod.一種用於輸送裝置的驅動機構包含:旋轉器,包括外表面和內表面,該旋轉器被建構用於從第一位置旋轉至第二位置。針遮蔽件包括內表面,其嚙合該旋轉器的該外表面。可旋轉的柱塞桿包括外表面,被建構用於嚙合該旋轉器的該內表面。當該旋轉器從該第一位置旋轉至該第二位置時,該可旋轉的柱塞桿被該旋轉器轉動,且該柱塞桿彈簧被從預繃緊狀態釋放,以施加一力在該可旋轉的柱塞桿上。10‧‧‧輸送裝置12‧‧‧驅動機構14‧‧‧(裝置)遠側端20‧‧‧(裝置)近側端24‧‧‧蓋件26‧‧‧外殼28‧‧‧(外殼)遠側端30‧‧‧(外殼)近側端34‧‧‧內表面38‧‧‧外表面44‧‧‧第一觀看開口(窗)46、46A‧‧‧第二觀看開口(窗)110‧‧‧針遮蔽件200‧‧‧容器(匣)214‧‧‧栓塞
