Intermixing syringe

Claim 1

AN INTERMIXING SYRINGE FOR THE ISOLATED STORAGE OF MEDICANTS AND THE LIKE, THE SYRINGE INCLUDING AN OUTER HOUSING HAVING A PARTIALLY CLOSED FRONT END AND AN OPEN REAR END, AND MEANS ON SAID PARTIALLY CLOSED FRONT END FOR THE MOUNTING THEREON OF A HYPODERMIC NEEDLE, AND A HOLLOW PLUNGER SLIDABLE IN THE BORE OF THE HOUSING AND PROVIDING FOR THE ISOLATED STORAGE OF AT LEAST ONE OF THE MEDICANTS AND THE LIKE, THE SYRINGE INCLUDING MEANS WHEREBY AT LEAST ONE OF THE INGREDIENTS MAY BE SELECTIVELY TRANSFERRED FROM ONE OF THE STORAGE PORTIONS TO ANOTHER STORAGE PORTION FOR THE MIXING OF THE INGREDIENTS, THE SYRINGE COMPRISING: (A) AN OUTER HOUSING OF GENERALLY TUBULAR CONSTRUCTION AND HAVING AN INNER BORE FORMED WITH AT LEAST TWO DIAMETERS AND ARRANGED WITH A FRONT BORE PORTION OF RELATIVELY CONSTANT DIAMETER, AN INTERMEDIATE BORE PORTION ADJACENT THE FRONT BORE PORTION AND LARGER THAN SAID FRONT BORE PORTION, AND A REAR BORE PORTION OF RELATIVELY CONSTANT DIAMETER AND OF A SIZE SIMILAR TO THE FRONT BORE PORTION, (B) A PLUNGER OF GENERALLY TUBULAR CONFIGURATION AND HAVING ON ITS INNER END A PISTON PORTION CLOSING THE END OF THE PLUNGER, THE PISTON FORMED WITH AT LEAST TWO OUTWARDLY EXTENDING AND RESILIENT RING-TYPE SEALING SURFACES SIZED SO AS TO BE SLIDABLE IN THE LIKE-SIZED FRONT AND REAR LESSER BORE PORTIONS WHILE ENGAGING THESE BORE PORTIONS IN A FLUID-FLOW SEALING MANNER AND BEING MANIPULATABLE IN THE FRONT BORE FOR ASPIRATION OF THE SYRINGE, THE PLUNGER HAVING AT LEAST ONE FLUID PASSAGEWAY FROM THE INNER STORAGE CHAMBER OF THE PLUNGER AND TERMINATING AT THE PISTON SURFACE AND BETWEEN ADJACENT RING-TYPE SEALING SURFACES, THE RING-TYPE SEALING SURFACES AS THEY ARE BROUGHT IN THE WAY OF THE INTERMEDIATE BORE PORTION BEING SMALLER THAN THE INTERMEDIATE BORE PORTION AND RENDERED INEFFECTIVE FOR FLUID SEALING OF THE BORE, AND (C) REMOVABLE MEANS PROVIDING FOR THE SEALING OF THE OUTER OPEN END OF EACH OF THE STORAGE CHAMBERS OF THE PLUNGER TO SEAL THE CHAMBERS FOR STORAGE AND TRANSPORT.