| 主权项 |
1. An injection unit for an injection device, the injection unit comprising:
a housing extending along a longitudinal axis, a cartridge holder configured to axially fix a drug cartridge with respect to the housing a needle holder comprising a needle mount adapted to receive and hold a fluid delivery structure, the needle holder being moveable relative to the cartridge holder between a first position and a second position, where movement from the first position to the second position is converging, and movement from the second position to the first position is diverging, and where the needle holder is biased towards the first position, a dose expelling mechanism for pressurising an axially fixed drug cartridge, the dose expelling mechanism comprising a piston rod, a spring member adapted to provide energy for activation of the piston rod, and a dose activation button operable to cause a release of energy from the spring member, and a blocking structure configured to disable the dose expelling mechanism in response to the needle holder being moved from the second position to the first position, and to enable the dose expelling mechanism in response to the needle holder being moved from the first position to the second position. |
