Fountain syringe

Claim 1

A FOUNTAIN SYRINGE COMPRISING FIRST AND SECOND HALF SHEELS OF ELASTOPLASTIC MATERIAL ADAPTED TO BE LOCKED TOGETHER IN SEALING RELATIONSHIP TO PROVIDE A VESSEL OF SPHEROIDAL SHAPE; A TUBULAR MEMBER PROJECTING FROM THE SECOND HALF SHELL AT A POINT OF EVEN DISTANCE FROM ITS PERIPHERY AND HAVING A CENTRAL BORE IN COMMUNICATION WITH SAID VESSEL; MEANS TO CLOSE THE OUTLET FROM THE BORE; THE FIRST HALF SHELL HAVING A V-SHAPED GROOVE ADJACENT ITS PERIPHERY, SAID GROOVE PERMITTING THE FIRST HALF SHELL TO BE DEFORMED BY THE APPLICATION OF PRESSURE THEREON INTO THE SECOND HALF SHELL, WHEN THE SHELLS ARE LOCKED TOGETHER, AND INTO CLOSE CONTACT WITH THE INNER SURFACE OF THE SECOND HALF SHELL IN THE DEFORMED POSITION; THE OUTER WALL OF THE SAID GROOVE BEING EXTENDED TO FORM A CYLINDRICAL FLANGE OF SUCH A HEIGHT THAT IT FORMS WITH THE FIRST HALF SHELL A VESSEL OF SUFFICIENT CAPACITY TO ACCOMMODATE THE QUANTITY OF MEDICAMENT REQUIRED TO COMPLETELY FILL THE SYRINGE EXCLUDING ANY AIR THEREFROM, SAID FLANGE HAVING ON ITS INNER SURFACE AN INWARDLY PROJECTING SHOULDER WITH A LEAD-IN RAMP THEREON, THE SECOND HALF SHELL HAVING A FURTHER CYLINDRICAL FLANGE EXTENDING FROM ITS PERIPHERY IN THE DIRECTION OF THE TUBULAR MEMBER AND CO-AXIAL THEREWITH, SAID FURTHER FLANGE HAVING ON THE OUTER SURFACE AN OUTWARDLY PROJECTING STEP ADAPTED TO ENGAGE SAID INWARDLY PROJECTING SHOULDER OF SAID FIRST MENTIONED FLANGE TO LOCK THE TWO HALF SHELLS TOGETHER.