drive mechanism of the drug delivery device, the displacement in the distal direction (25) for the dose delivery and it is, comprises a piston rod (11) which is displaced in the proximal direction (26) for resetting, in the delivery of a dose, and a rotatable drive member which is threadedly engaged to rotate the piston rod (16). During delivery of the dose, received a load by the rotation of the driving member, the piston rod is screwed into the drive member tends to rotate the piston rod relative to the drive member to be advanced thereby in the proximal direction, the biasing member (20) is provided. The drug delivery device comprises such a drive mechanism.薬物送達デバイスの駆動機構は、用量の送達のために遠位方向(25)に変位され、リセットのために近位方向(26)に変位されるピストンロッド(11)と、用量の送達中、ピストンロッドにねじ係合され回転する回転可能駆動部材(16)とを備える。用量の送達中、駆動部材の回転によって負荷を受け、ピストンロッドが駆動部材に螺入し、それによって近位方向に進められるように駆動部材に対してピストンロッドを回転させる傾向がある、付勢部材(20)が提供される。薬物送達デバイスは、そうした駆動機構を備える。
