Two-chamber mixing syringe
Injection syringe with telescopic assembly between cartridge and vial
ApplicationNo. 06/584883 filed on 02/29/1984
US Classes:604/88, Septum604/92Solid dissolved in liquid
ExaminersPrimary: Metz, Andrew H.
Assistant: McFarlane, Anthony
Attorney, Agent or Firm
International ClassA61M 5/315 (20060101)
AbstractA multi-cartridge syringe assembly includes one cartridge containing a diluent and insertable within another cartridge containing dry medication. The nose of the diluent cartridge supports a cannula and is surrounded by a lock head member. In an initial mode, the exposed cannula is surrounded by a resilient cover. A retaining element extending rearwardly from a piston in the medication cartridge includes lock elements sequentially engageable with first and second annular devices on the lock head member as the two cartridges are axially displaced towards each other. In a first position the two cartridges are locked together without any axial displacement between the cannula and its cover while in a second position the cover is forced rearwardly of the cannula as the point of the cannula pierces the cover as well as the piston in the medication cartridge.