Training mechanism for drug delivery device

US9336690B2 · kind B2 · utility

Assignee

• Sanofi-Aventis Deutschland GMBH · DE

Inventors

• Michael Helmer · Frankfurt am Main, DE
• Peter Nober · Rommersheim, DE
• Christoph Garthen · Dexheim, DE
• Christian Dexheimer · Gerolzhofen, DE
• Benjamin Schaefer · Haßloch, DE

Key dates

• Filing date: Dec 6, 2011
• Grant date: May 10, 2016
• Expiry date: May 29, 2033

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2005/31508
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The present invention relates to a cartridge for a drug delivery device comprising of a body of substantially cylindrical shape, a piston slidably disposed in the body along two opposite axial directions, along a distal and along a proximal direction, and at least one friction means operably engaged with the piston to generate a pre-defined friction force between the piston and an inside wall of the body, when the piston is displaced relative to the body, wherein in response to an axial displacement of the piston relative to the body in distal direction and in proximal direction, the at least one friction means is adapted to generate respective proximal and distal friction forces that are different in magnitude.