| 摘要 |
Dial up/dial down spring-driven drug delivery device comprising a rotatable driver assembly allowing a user to set a dose amount to be expelled and strain a drive spring correspondingly. A rotatable ratchet member is coupled to the driver assembly with a rotational play, the play allowing the driver assembly to release the ratchet member and thereby decrease a set dose. A helically moving scale drum is coupled to the driver assembly and comprises a stop surface preventing the driver assembly from being rotated below an initial position, whereby the driver assembly in the initial position is prevented from being rotated in the resetting direction relative to the ratchet member corresponding to the rotational play. |
