Drug delivery device for delivering a predefined fixed dose
Inventors
Assignees
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Publication Number
US-12390600-B2
Publication Date
2025-08-19
Expiration Date
Abstract
A drug delivery device (100, 200) for delivering a fixed dose, wherein the drug delivery device comprises: a housing assembly, a drug reservoir with a piston and a drive mechanism. The drive mechanism comprises a piston rod (109, 209) for advancing the piston to expel a drug, and a drive tube (180, 280), wherein the drive mechanism is adapted to deliver the predefined fixed dose in response to activation. The drug delivery device further comprises an activation mechanism for activating the drive mechanism, in response to moving the drive tube in an axial direction. The housing assembly comprises a guide structure for guiding the drive tube during activation and delivery of a dose, wherein the guide structure comprises an axial portion (156, 256) providing a sliding surface for guiding the drive tube during activation, and for providing a rotational stop defining an end of dose, and a helical portion (157, 257) providing a sliding surface adapted for guiding the drive tube (180, 280) during dosing. The drive tube (180, 280) comprises a guide structure comprising an axial portion (182, 282) adapted for slidably engaging the axial portion of the housing assembly for activation, and a helical portion (189, 289) for slidably engaging the helical portion of the housing assembly during dosing during dosing.
Core Innovation
The invention relates to a drug delivery device for delivering a fixed dose, comprising a housing assembly, a drug reservoir with a piston, and a drive mechanism. The drive mechanism comprises a piston rod operationally arranged in the housing assembly and a drive tube operationally arranged with the piston rod. The drive tube is adapted to be axially movable relative to the housing and rotationally blocked in a stationary state, and to be axially movable and rotatable relative to the housing in a dosing state.
A triggering mechanism activates the drive mechanism in response to moving the drive tube in an axial direction. The housing assembly comprises a housing guide structure for guiding the drive tube during activation and delivery of a dose, including an axial housing portion providing a first sliding surface for guiding the drive tube during activation and defining an end of dose position via a rotational stop, and a circumferential housing portion providing a second sliding surface for guiding the drive tube during dosing.
The drive tube comprises a drive guide structure including an axial drive portion adapted for slidably engaging the corresponding axial housing portion for activation and a circumferential drive portion adapted for slidably engaging the corresponding circumferential housing portion during dosing. During activation, the drive tube is guided along the axial housing portion without rotation to change from the stationary state to the dosing state, and during dosing the drive tube is moved axially and rotated by the drive mechanism to advance the piston rod and deliver the fixed dose.
Claims Coverage
The independent claim defines 4 inventive features centered on the drive tube state change behavior and matched guide structures.
Axially movable, rotationally blocked to rotatable dosing state drive tube
The drive tube is axially movable relative to the housing and rotationally blocked in a stationary state, and is adapted to be axially movable and rotatable relative to the housing in a dosing state.
Axial housing portion with rotational stop end of dose position and circumferential dosing sliding surface
The housing assembly comprises a housing guide structure including an axial housing portion that provides a first sliding surface for guiding the drive tube during activation and defines an end of dose position via a rotational stop, and a circumferential housing portion providing a second sliding surface for guiding the drive tube during dosing.
Axial and circumferential drive guide portions matched to housing guide portions
The drive tube comprises a drive guide structure including an axial drive portion adapted for slidably engaging the corresponding axial housing portion for activation and a circumferential drive portion adapted for slidably engaging the corresponding circumferential housing portion during dosing.
Triggering mechanism based on axial movement of the drive tube
A triggering mechanism activates the drive mechanism in response to moving the drive tube in an axial direction.
The claim set centers on a drive tube that is rotationally blocked in a stationary state but becomes axially movable and rotatable in a dosing state, controlled by matched axial and circumferential guide structures of the housing and the drive tube. Activation is triggered by axial movement of the drive tube, and the end of dose position is defined by a rotational stop.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
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