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    • 36. 发明申请
    • FIXED DOSE INJECTION DEVICE
    • US20230047780A1
    • 2023-02-16
    • US17782313
    • 2020-12-09
    • Novo Nordisk A/S
    • Bo KvolsbjergBjoern Gullak Larsen
    • A61M5/315A61M5/20
    • A drug delivery device (100, 200) for delivering a fixed dose, comprising a drive mecha-nism comprising a drive spring (108, 208), and an activation mechanism comprising a connector (170, 270) adapted for activating the drive mechanism, wherein the drug de-livery device further comprises a split-dose-prevention mechanism adapted for limiting the axial movement of the connector during dosing. The split dose prevention mechanism comprises: (i) a split-dose-prevention structure (184, 284.1, 284.2) provided on the drive tube (180, 280) and extending in a circumferential direction, and (ii) a retention portion (178.3, 278.2) provided on the connector. For the drive tube being arranged in the intermediate position, the split-dose-prevention structure (184, 284.1, 284.2) and the retention portion are arranged with a transverse overlap, whereby movement of the connector in the second axial direction is limited by the split-dose prevention structure. For the drive tube being arranged in the stop position, the split-dose-prevention structure (184, 284.1, 284.2) and the retention portion are arranged with a transverse clearance and/or an axial gap, whereby the return spring (107, 207) can move the connector in the second axial direction, in response to releasing the applied force in the first direction on the connector.