Two compartment syringe with vapor seal between compartments

Claim 1

A HYPODERMIC SYRINGE COMPRISING AN OUTER BARREL, SAID BARREL HAVING AN ORIFICE AT ONE END THEREOF, DISPLACEABLE CLOSURE MEANS FOR OCCLUDING SAID ORIFICE, A MEDICAMENT IN SAID OUTER BARREL AT SAID ORIFICE END THEREOF, AN INNER BARREL TELESCOPED INTO SAID OUTER CYLINDER BARREL, A RESILIENT STOPPER IMMOVABLY LOCATED WITHIN THE END OF SAID INNER BARREL WHICH IS ADJACENT THE ORIFICE, A PASSAGEWAY THROUGH SAID STOPPER, A BALL SLIGHTLY LARGER IN DIAMETER THAN THE NORMAL DIAMETER OF THE PASSAGE LODGED IN SAID PASSAGE, A PISTON IN SAID INNER BARREL AT THE OTHER END OF SAID INNER BARREL, A SOLUTE FOR SAID MEDICAMENT IN SAID INNER BARREL BETWEEN THE PISTON AND THE STOPPER, A VAPOR IMPERMEABLE DISC EMBEDDED IN THE STOPPER IN A PLANE PERPENDICULAR TO THE PASSAGEWAY AND LOCATED BETWEEN THE BALL AND FACE OF THE STOPPER ADJACENT THE ORIFICE IN THE OUTER CYLINDER, SAID DISC HAVING FORMED THEREWITH AN ANNULAR CYLINDER, EXTENDING REARWARDLY THROUGH THE MATERIAL OF THE STOPPER, SAID CYLINDER HAVING AN INWARDLY DIRECTED FLANGE AT ITS REAR END HELD IN A NECK PORTION AT THE FORWARD END OF THE INNER BARREL, AND MEANS TO DRIVE THE PISTON TOWARD THE STOPPER TO FIRST EXPEL THE BALL FROM THE PASSAGE, NEXT FORCE THE SOLUTE THROUGH THE PASSAGE WHILE THE INNER BARREL IS AUTOMATICALLY DRIVEN TO GREATER EXTENSION FROM SAID OUTER BARREL, THEREBY ENABLING A DISSOLVING OF THE MEDICAMENT TO OCCUR AND PREPARING THE SYRINGE FOR EXPULSION OF THE DISSOLVED MEDICAMENT FROM THE SYRINGE.