Drive train for dial of a torsion-spring assisted wind-up injection device

US12226618B2 · kind B2 · utility

Assignee

• Sanofi · FR

Inventors

• Michael Jugl · Frankfurt am Main, DE
• Matthew Meredith Jones · Hamilton, BM
• Axel Teucher · Frankfurt am Main, DE
• Stefan Blancke · Frankfurt am Main, DE
• Ralph Donald Quentin Collings · Bristol, GB
• James Robert Coop · Bristol, GB
• James Anthony West · Bristol, GB
• Stephen Francis Gilmore · Bristol, GB
• Daniel David Higgins · Bristol, GB
• Mark Digby Teucher · Bristol, GB

Key dates

• Filing date: Mar 11, 2019
• Grant date: Feb 18, 2025
• Expiry date: Jun 20, 2042

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2205/582
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A drive train for a wind-up injection device, comprises a torsional energy storage adapted to be loaded or unloaded by a rotatable element, a rotatable user handle coupled with a button, a rotationally drivable expelling mechanism, and a clutch element coupled with the torsional energy storage via the rotatable element and comprising a ratchet for maintaining the rotatable element at one of a number of discrete angular positions, wherein via the rotatable element, the clutch element is adapted to transmit a torque from the user handle to the torsional energy storage or from the torsional energy storage to the expelling mechanism, and wherein the ratchet is switchable from one position to an adjacent position by a torque transmitted from the user handle to the torsional energy storage, and wherein the drive train is adapted to dampen torque peaks by a flexible impact portion in the area of the clutch element.