Combination syringe and vial mixing container

Claim 1

IN COMBINATION: (1) A MIXING CHAMBER FOR CONTAINING A FIRST STERILE INGREDIENT FOR INJECTION AND HAVING AN OPEN END; (2) A STORAGE CHAMBER FOR CONTAINING A STERILE FLUID INGREDIENT FOR INJECTION AFFIXED TO SAID MIXING CHAMBER; (3) PENETRABLE PLUG MEANS SEALING SAID OPEN END OF SAID MIXING CHAMBER; (4) A CANNULA EXTENDING FROM ONE END OF SAID STORAGE CHAMBER THROUGH SAID PLUG INTO SAID MIXING CHAMBER AND COMMUNICATING THEREBETWEEN; (5) A PLUNGER MOUNTING A PISTON SLIDABLE IN SAID STORAGE CHAMBER; (6) A FREE PISTON SITUATED IN SAID STORAGE CHAMBER BETWEEN SAID PLUNGER-MOUNTED PISTON AND SAID CANNULA, AND DEFINING, WITH SAID PLUNGER-MOUNTED PISTON A FLUID STORAGE COMPARTMENT IN SAID CHAMBER, SAID FREE PISTON COMPRISING A CYLINDRICAL BODY HAVING A PLURALITY OF CIRCUMFERENTIALLY EXTENDING RINGS OF RESILIENT MATERAL, AND AT LEAST TWO LEGS DEPENDING FROM THE LOWER SURFACE THEREOF, AND (7) BYPASS MEANS EXTENDING BELOW THE LOWEST POINT OF SAID FLUID STORAGE COMPARTMENT AND HAVING A LONGITUDINAL EXTENT GREATER THAN THE HEIGHT OF SAID FREE PISTON, WHEREBY DOWNWARD MOVEMENT OF SAID PLUNGER-MOUNTED PISTON WILL HYDRAULICALLY FORCE SAID FREE PISTON INTO A POSITION WHEREIN SAID LEGS ENGAGE SAID ONE END OF SAID STORAGE CHAMBER, THEREBY PERMITTING FLUID INTO SAID STORAGE COMPARTMENT TO FLOW THROUGH SAID BYPASS AND SAID CANNULA, INTO SAID MIXING CHAMBER, WHEREUPON THE RESULTING FLUID MIXTURE CAN BE WITHDRAWN FROM SAID MIXING CHAMBER INTO SAID STORAGE CHAMBER AND SAID STORAGE CHAMBER SEPARATED FROM SAID MIXING CHAMBER FOR USE.