There is described a medication delivery device comprising a housing, a door (88) which, in its open position, permits insertion/removal of a medication container (83) into/from said housing, a door opening mechanism (89, 123, 125, 126, 82) for opening/closing said door (88), and a push member which can be moved axially from a retracted position, located outside said medication container (83), to enter said medication container (83) and push liquid medication contained in said medication container (83) out of said medication container (83) to deliver it to a patient, and then returned to its retracted position, characterized by comprising a lock mechanism (94, 129) for locking at least part of said door opening mechanism (89, 123, 125, 126, 82), to prevent opening of said door (88), when said push member is inside said medication container (83) and for unlocking said door opening mechanism (89, 123, 125, 126, 82) when said push member is in its retracted position.본 발명은 손에 들고 사용하며 전자적으로 제어되어 미리 정해진 투약량의 액체 약물을 주사하기 위한 주사장치(10)에 관한 것이다. 주사장치는, 액체 약물을 포함하는 카트리지(4)를 수용하기 위한 하우징(2)과, 환자의 피부에 접촉하는 접촉면(16)과, 하우징(2) 내에서 접촉면(16)을 향하여 그리고 접촉면으로부터 멀어지게 카트리지(4)를 이동시키는 액추에이터 수단들(41)을 구비한다.
