The present disclosure relates to an administration assembly 10 for drug delivery device 1, which administration assembly 10 is configured to proximally bias the plunger rod 15 and the plunger rod 15. A first with respect to the plunger rod holder 21, configured to receive a member 17, an elongated plunger rod holder 21 configured to receive the plunger rod 15, and a portion of the plunger rod holder 21. A activating sleeve 23 configured to axially move from a position to a second position and configured to deflect toward the first position, the plunger rod holder 21 having a first retaining and releasing structure 21a, The plunger rod 15 has a second retaining and releasing structure 15a, and in the first position, the activating sleeve 23 shafts the first retaining and releasing structure 21a with the second retaining and releasing structure 15a. Configured to hold in the directional locking contact position, the axial locking contact position , The second retaining and releasing structure 15a is prevented from moving relative to the first retaining and releasing structure 21a to lock the plunger rod 15 axially with respect to the plunger rod holder 21. In the position, the activating sleeve 23 is configured to allow the first retaining and releasing structure 21a to move out of the axial locking contact position, whereby the deflection of the plunger rod provided by the first elastic member 17 is controlled. 2 retaining and releasing structure 15a exerts a proximal directionally directed force on first retaining and releasing structure 21a to move first retaining and releasing structure 21a tangentially from the axial locking contact position. To release the plunger rod 15 from the plunger rod holder 21.본 개시는 약물 전달 장치(1)용 투여 조립체(10)에 관련되며, 이 투여 조립체(10)는, 플런저 로드(15)와, 플런저 로드(15)를 근위방향으로 편향시키도록 구성된 제 1 탄성 부재(17)와, 플런저 로드(15)를 수용하도록 구성된 세장형의 플런저 로드 홀더(21)와, 플런저 로드 홀더(21)의 일부를 수용하도록 구성되고, 플런저 로드 홀더(21)에 대한 제 1 위치로부터 제 2 위치로 축방향으로 이동하도록 구성되며, 제 1 위치를 향해 편향되도록 구성된 활성화
