Needle assisted jet injection device having reduced trigger force

US9364611B2 · kind B2 · utility

Assignee

• Antares Pharma, Inc. · US

Inventors

• Thomas E. Kramer · Coon Rapids, US
• Matthew H. Rust · River Falls, US
• Paul M. Goudreau · Edina, US
• Peter A. Hoeft · Seattle, US
• Julius C. Sund · Plymouth, US
• Peter L. Sadowski · Woodbury, US
• Michael Travanty · Minneapolis, US
• Patrick Madsen · Litchfield, US

Key dates

• Filing date: May 7, 2013
• Grant date: Jun 14, 2016
• Expiry date: Mar 17, 2034

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M2202/048
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An exemplary embodiment of an injector includes a trigger mechanism, an energy source, and a user-operable firing-initiation member. The trigger mechanism can include a floating trigger member having a retaining portion, a ram assembly having a ram configured to pressurize a medicament container for expelling a medicament therefrom, the ram assembly further having a floating trigger engagement member configured to engage the retaining portion of the floating trigger member when the floating trigger member is in a pre-firing condition. The energy source can be associated with the ram for powering the ram to expel the medicament, and the user-operable firing-initiation member can be operable for causing an axial rotation of the floating trigger member from the pre-firing condition to a firing condition in which the floating trigger engagement member is released from the retaining portion to allow the energy source to fire the ram.