Backflow prevention mechanism for drug delivery device

US11890450B2 · kind B2 · utility

Assignee

• AMGEN INC. · US

Inventors

• Lawrence S. Ring · Valencia, US
• Tohid Pirbodaghi · Cambridge, US
• Samin Akbari · Cambridge, US
• Daniel Eduardo Groszmann · Belmont, US
• Mehran Mojarrad · Thousand Oaks, US
• Mark Gordon · McLean, US
• Mikhail Tikh · St. Louis Park, US
• Jimmie L. Ward · Golden, US
• Scott R. Gibson · San Fernando, US
• Sheldon B. Moberg · Thousand Oaks, US
• Joshua Tamsky · Los Angeles, US
• Paul D. Faucher · Escondido, US
• Jeff Lind · Thousand Oaks, US

Key dates

• Filing date: Mar 8, 2019
• Grant date: Feb 6, 2024
• Expiry date: Apr 7, 2040

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2209/045
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A drug delivery device includes a housing defining a shell and an inner volume, a container, a drive mechanism, a needle assembly, a fluid flow connection, and a backflow prevention mechanism. The container has an inner volume to contain a medicament to be administered to a user. The drive mechanism is at least partially disposed within the housing and exerts a force to urge the medicament out the container. The fluid flow connection is coupled to the container and the needle assembly and allows the medicament to flow from the container to the needle assembly to be administered. The backflow prevention mechanism is associated with at least one of the container, the fluid flow connection, or the needle assembly and includes at least one flow restrictor to restrict a fluid from flowing from the needle assembly to the container.