This is generally directed to an injection Device for the selection and distribution of several variables by a user, a dose of a drug.The injection Device comprises a housing (10) having a longitudinal AXIS (L), a Dose setting Member (60 80) rotating with respect to the housing (10) during the establishment of doseA Drive Member (40) which is rotationally constrained housing (10) in a First Mode of establishment of dose and it is rotating with respect to the housing (10) in a Second Mode of dispensing doseA locking element (100) which is rotationally constrained permanently housing (10) and is movable relative to the housing (10) in a direction parallel to the longitudinal AXIS (L) between a first position and a second position establishment of dose dispensing DoseAn Actuator (70) with movable relative to the housing (10) in a direction parallel to the longitudinal AXIS (R) between a first position and a second position establishment of dose dose dispensing injection Device for switching between the first mode is Establishment of dose and the second dose dispensing Mode, a Ratchet (42,120) to transmit torque from the Dose setting Member (60) to the Drive Member (40) during the dispensation of dose and allow the relative rotational Movement between the Dose setting Member (60) and the driving Member (40) during the establishment of dose, The TR Inquete (42,120) includes a First Ratchet characteristics (43) rotationally constrained the impeller (40) and a Second Ratchet characteristics (121) rotationally constrained the Dose setting Member (60) and a Spring (130).The Spring (130) predisposes the locking element (100) and the Actuator (70) to their first position establishment of dose and predisposes the first characteristics of Ratchet (43) to the coupling with the second Ratchet characteristics (121).La presente está dirigida generalmente a un dispositivo de inyección para la selección y la dispensación de varias dosis, variables por un usuario, de un medicamento. El
