Drive mechanism of a drug delivery device

US10124118B2 · kind B2 · utility

Assignee

• Sanofi · FR

Inventors

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

Key dates

• Filing date: Apr 8, 2014
• Grant date: Nov 13, 2018
• Expiry date: Jun 21, 2035

Classification

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

Abstract

A drive mechanism of a drug delivery device for dispensing of a dose of a medicament includes a housing extending in an axial direction, a piston rod to operably engage with a piston of a cartridge to displace the piston in an axial distal direction, and a drive sleeve extending in the axial direction and being rotatable in a dose incrementing direction against the action of a spring enclosing at least an axial portion of the drive sleeve. The drive mechanism further includes a dose limiting member threadedly engaged with the drive sleeve, rotatably locked to the housing and at least partially extending radially between the drive sleeve and the spring, and at least one stop located on at least one of dose limiting member and drive sleeve for limiting an axial displacement of the dose limiting member relative to the drive sleeve.