Dual cartridge wet/dry syringe
Patent 4581016 Issued on April 8, 1986. Estimated Expiration Date: 
February 29, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 29, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2841145 3327710 3542023 3636950 3724460 3785379 3911916 3916894 Two-chamber mixing syringe Injection syringe with telescopic assembly between cartridge and vial InventorAssigneeApplicationNo. 06/584883 filed on 02/29/1984US Classes:604/88, Septum604/92Solid dissolved in liquidExaminersPrimary: Metz, Andrew H.Assistant: McFarlane, Anthony Attorney, Agent or FirmInternational 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. | |
