Plungers for drug delivery devices

US11191904B2 · kind B2 · utility

Assignee

• AMGEN INC. · US

Inventors

• Julian Jazayeri · Calabasas, US
• Ronald Forster · Simi Valley, US
• Jolita Seckute · Thousand Oaks, US
• Olivia Alice Henderson · Newbury Park, US
• Kristen Brown · Parker, US
• Gregory Gordon · Omaha, US
• Rasmus Øhlenschlæger · Thisted, DK
• Peter Dan Kaare Soelberg · Copenhagen, DK

Key dates

• Filing date: Oct 9, 2018
• Grant date: Dec 7, 2021
• Expiry date: Apr 22, 2039

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2005/3117
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A plunger configured as described herein provides geometry optimizations to minimize friction magnitude and variability during use by maintaining low deformation under large extrusion forces. More specifically, plunger embodiments described herein minimize a contact area between the plunger and a syringe or chamber, while also maintaining high contract pressures to maintain container closure integrity. Moreover, the plunger embodiments are configured to have minimal or no increase in the contact area under high loads associated with the delivery of viscous products.