US 12,390,600 B2
Drug delivery device for delivering a predefined fixed dose
Bjoern Gullak Larsen, Birkeroed (DK)
Assigned to Novo Nordisk A/S, Bagsvaerd (DK)
Appl. No. 17/780,276
Filed by Novo Nordisk A/S, Bagsvaerd (DK)
PCT Filed Dec. 9, 2020, PCT No. PCT/EP2020/085201
§ 371(c)(1), (2) Date May 26, 2022,
PCT Pub. No. WO2021/122190, PCT Pub. Date Jun. 24, 2021.
Claims priority of application No. 19217339 (EP), filed on Dec. 18, 2019.
Prior Publication US 2022/0409821 A1, Dec. 29, 2022
Int. Cl. A61M 5/315 (2006.01); A61M 5/32 (2006.01)
CPC A61M 5/31595 (2013.01) [A61M 5/31536 (2013.01); A61M 5/31583 (2013.01); A61M 5/31593 (2013.01); A61M 5/3202 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A drug delivery device for delivering a fixed dose, wherein the drug delivery device comprises:
a housing assembly,
a drug reservoir with a piston
a drive mechanism comprising a piston rod operationally arranged in the housing assembly and adapted for advancing the piston to expel a drug during dosing, and a drive tube operationally arranged with the piston rod, wherein the drive tube is adapted to be axially movable relative to the housing assembly and rotationally blocked in a stationary state, and adapted to be axially movable and rotatable relative to the housing in a dosing state, wherein the drive mechanism is adapted for axial movement and rotation of the drive tube in the dosing state and thereby advance the piston rod to deliver the fixed dose in response to activation;
a triggering mechanism for activating the drive mechanism, in response to moving the drive tube in an axial direction,
wherein the housing assembly comprises a housing guide structure for guiding the drive tube during activation and delivery of a dose, wherein the housing guide structure comprises an axial housing portion providing a first sliding surface for guiding the drive tube during activation, and for providing a rotational stop defining an end of dose position, and a circumferential housing portion providing a second sliding surface adapted for guiding the drive tube during dosing;
wherein the drive tube comprises a drive guide structure comprising an axial drive portion adapted for slidably engaging the corresponding axial housing portion for activation, and a circumferential drive portion for slidably engaging the corresponding circumferential housing portion during dosing,
whereby the drive tube can be guided along the axial housing portion without rotation and thereby changed from the stationary state to the dosing state during activation, whereby the drive tube can be moved axially and rotated by the drive mechanism in the dosing state, and whereby the drive tube can be guided along the circumferential housing portion until the end of dose position and thereby changed from the dosing state to the stationary state, in response to activation of the drive mechanism.