Drug delivery device and method for a drug delivery device

US10376650B2 · kind B2 · utility

Assignee

• Sanofi-Aventis Deutschland GMBH · DE

Inventors

• Michael Helmer · Frankfurt am Main, DE
• Christoph Eissengarthen · Nackenheim, DE
• Winfried Huthmacher · Frankfurt am Main, DE
• Carsten Mosebach · Frankfurt am Main, DE

Key dates

• Filing date: Jun 13, 2017
• Grant date: Aug 13, 2019
• Expiry date: Sep 26, 2037

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 (1) is provided comprising a housing (4) comprising a distal end and a proximal end and a cartridge (3) adapted and arranged to contain at least one dose of a drug (16), a bung (5) being movably arranged within the cartridge (3). In an initial state of the device (1), the bung (5) is arranged in a proximal end position with respect to the cartridge (3). The device (1) further comprises a piston rod (9) adapted and arranged to move the bung (5) in the distal direction with respect to the cartridge (3) for delivering a dose of the drug (16). The device (1) further comprises a mechanism operable such that, after a dose delivery operation was completed, the piston rod (9) is moved into the proximal direction with respect to the bung (5) by a back off distance (D), wherein in the initial state, a distance between a distal end of the piston rod (9) and a proximal end of the bung (5) is greater than zero, with the distance between the piston rod (9) and the bung (5) in the initial state being defined by the back off distance (D). Furthermore, a method for assembling a drug delivery device (1) is provided.