Drive mechanism for a drug delivery device

US10076610B2 · kind B2 · utility

Assignee

• Sanofi · FR

Inventors

• Stefan Bayer · Würselen, DE
• Daniel Berning · Baesweiler, DE
• Philippe Blank · Düsseldorf, DE
• Wolfgang Pelzer · Kreuzau, DE
• Michael Pfoser · Würselen, DE
• Björn Wilden · Simmerath, DE

Key dates

• Filing date: Apr 8, 2014
• Grant date: Sep 18, 2018
• Expiry date: Nov 27, 2034

Classification

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

Abstract

A drive mechanism for a drug delivery device includes an elongated housing extending in an axial direction and a piston rod to operably engage with a piston of a cartridge to displace the piston in an axial distal direction. A drive sleeve is rotatably supported in the housing, operably releasable from the piston rod for setting of a dose, and operably engageable with the piston rod for dispensing of the dose. A dose limiting member is engaged with the drive sleeve and engaged with the piston rod in such a way that it is displaced in axial direction relative to the drive sleeve when the drive sleeve rotates relative to the piston rod during a dose setting procedure. At least one stop is configured to engage with the dose limiting member for limiting the axial displacement of the dose limiting member during the dose setting procedure and to impede further displacement of the drive sleeve relative to the piston rod.