Drug delivery device and method for a drug delivery device

US9707352B2 · kind B2 · utility

Assignee

• Sanofi-Aventis Deutschland GMBH · DE

Inventors

• Michael Helmer · Frankfurt am Main, DE
• Christoph Eisengarthen · Ginsheim, DE
• Winfried Huthmacher · Frankfurt am Main, DE
• Carsten Mosebach · Frankfurt am Main, DE

Key dates

• Filing date: Sep 27, 2012
• Grant date: Jul 18, 2017
• Expiry date: Nov 20, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/4978
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A drug delivery device is provided comprising a housing comprising a distal end and a proximal end and a cartridge adapted and arranged to contain at least one dose of a drug, a bung being movably arranged within the cartridge. In an initial state of the device, the bung is arranged in a proximal end position with respect to the cartridge. The device further comprises a piston rod adapted and arranged to move the bung in the distal direction with respect to the cartridge for delivering a dose of the drug. The device further comprises a mechanism operable such that, after a dose delivery operation was completed, the piston rod is moved into the proximal direction with respect to the bung by a back off distance (D), wherein in the initial state, a distance between a distal end of the piston rod and a proximal end of the bung is greater than zero, with the distance between the piston rod and the bung in the initial state being defined by the back off distance (D). Furthermore, a method for assembling a drug delivery device is provided.