An injection device including a compression spring for engaging the ratchet element, urging the actuation button, and urging the locking element into the dose setting mode
The present invention is generally directed to an injection device for selecting and dispensing several user variable doses of a medicament. The injection device includes a housing (10) having a longitudinal axis (I), a dose setting member (60； 80) that can be rotated relative to the housing (10) during dose setting, and a first dose setting mode. A drive member (40) that is constrained in a rotational direction relative to the housing (10) and capable of rotating relative to the housing (10) in the second dose dispensing mode, and a permanent rotation relative to the housing (10). A locking element that is constrained in direction and is movable between a first dose setting position and a second dose dispensing position in a direction parallel to the longitudinal axis (I) relative to the housing (10) (100) and a housing (10) between a first dose setting position and a second dose dosing position for switching the injection device between a first dose setting mode and a second dose setting mode. ) Actuating button (70), which can move in a direction parallel to the longitudinal axis (I), and transmitting torque from dose setting member (60) to drive member (40) during dose dosing and during dose setting A first ratchet function (43) and a dose setting that allows relative rotational movement between the dose setting member (60) and the drive member (40) and is constrained in a rotational direction relative to the driver (40). A ratchet (42, 120) including a second ratchet function (121) constrained in a rotational direction relative to the member (60)； and a spring (130). The spring (130) biases the locking element (100) and the actuation button (70) to their first dose setting position, biases the first ratchet function (43) and the second ratchet function ( 121).本発明は、一般に、薬剤のいくつかの使用者可変用量を選択し投薬するための注射デバイスを対象とする。注射デバイスは、長手方向軸（Ｉ）を有するハウジング（１０）と、用量設定中にハウジング（１０）に対して回転することができる用量設定部材（６０；８０）と、第１の用量設定モードではハウジング（１０）に対して回転方向に拘束され第２の用量投薬モードではハウジング（１０）に対して回転することができる駆動部材（４０）と、ハウジ
