Dual chamber mixing device for a syringe

US9205194B2 · kind B2 · utility

Assignee

• UNITRACT SYRINGE PTY LTD · AU

Inventors

• Ramin Mojdehbakhsh · Sparta, US
• Peter J. Dungar · York, US
• Ashley Palmer · Cary, US
• Robert E. Johannesson · Mechanicsburg, US
• Philip A. Weaver · Mountain View, US
• Aaron M. Weir · York Haven, US

Key dates

• Filing date: Aug 3, 2012
• Grant date: Dec 8, 2015
• Expiry date: Jan 14, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49826
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A mixing device and a retractable syringe comprising same are provided. The mixing device comprises concentric outer and inner barrels that form an outer chamber, the inner barrel having an inner chamber. A mixing plunger is slidably located in the outer chamber. A seal located in the outer chamber is capable of axial movement, in response to depression of the mixing plunger, from a first position in sealing engagement with one or more apertures in the inner barrel to a second position intermediate the apertures and vents in the outer barrel. This allows depression of the mixing plunger to force a first substance from the outer chamber through the apertures to mix with a second substance in the inner chamber. The mixed substance in the inner barrel is then delivered by the syringe with subsequent needle retraction.