| 摘要 |
The invention relates to a needle unit (2) for connecting a drug delivery device to a medicament reservoir (1), the needle (2) unit comprising: - a hollow cannula (3) having a sharp proximal tip (3.1) for piercing a reservoir wall (1.1) of the medicament reservoir (1), - a stop member (5) which is axially fixed to the cannula (3), - a fluid pouch (4) disposed on a section of the cannula (3), - a fluid pump (8) for pumping a fluid through a fluid channel (7) into the fluid pouch (4), wherein in an initialstate the fluid pouch (4) is at least nearly flush with an outer surface of the cannula (3), wherein the fluid pouch (4) is adapted to dilate when the fluid is pumped into the fluid pouch (4) for squeezing the reservoir wall (1.1) between the stop member (5) and the fluid pouch (4). |
