Disposable cartridge type hypodermic syringes

Claim 1

A DISPOSABLE, SINGLE DOSE CARTRIDGE FOR USE IN PARETERNAL ADMINISTRATION OF MEDICAMENTS AND THE LIKE, COMPRISING AN ELONGATE TUBULAR BODY OF SUBSTANTIALLY UNIFORM BORE, OPEN AT ONE END, PARTIALLY CONSTRICTED AND PROVIDED WITH AN ANNULAR GROOVE FORMATION ON THE OUTER SURFACE NEAR THE OTHER END THEREOF, A PISTON POSITIONED WITHIN THE OPEN END OF THE TUBULAR BODY AND CAPABLE OF MOVEMENT AXIALLY THEREIN, ENGAGING THE INNER WALLS THEREOF TO PROVIDE AN ESSENTIALLY LIQUID-TIGHT CLOSURE THEREWITH, AND A PARTIAL CLOSURE AT THE OTHER END OF SAID TUBULAR BODY, SAID PARTIAL CLOSURE COMPRISING A DIAPHRAGM EXTENDING ACROSS AND LYING AGAINST THE BOTTOM OF SAID ANNULAR GROOVED FORMATION, SAID DIAPHRAGM BEING SELF-SEAING, PERFORATION IN SAID DIAPHRAGM NORMALLY CLOSED DUE TO THE SELF-SEALING CHARACTERISTICS OF THE DIAPHRAGM, BUT ADAPTED TO REOPEN UNDER THE INFLUENCE OF PRESSURE EXERTED ON SAID PISTON; AND PROVIDED ASAN INTEGRAL UNIT, A COMBINATION NEEDLE MOUNT, DIAPHRAGM EXPANSION AND NEEDLE MEMBER COMPRISING A TOP COLLAR PORTION ADAPTED TO ENGAGE SAID ANNULAR GROOVED FORMATION, AN ANNULAR RE-ENTRANT FLANGE AT THE TOP OF SAID COLLAR PORTION ENGAGING THE GROOVE OF SAID ANNULAR FORMATION, A RE-ENTRANT FLANGE AT THE BOTTOM OF SAID COLLAR PORTION ABUTTING AGAINST THE BOTTOM OF SAID DIAPHRAGM ALONG THE PERIPHERY THEREOF, A CUP-SHAPED PORTION SERVING AS AN EXPANSION CHAMBER FOR SAID DIAPHRAGM EXTENDING DOWNWARD FROM SAID RE-ENTRANT FLANGE AT THE BOTTOM OF THE COLLAR PORTION, A BOTTOM ON SAID CUP-SHAPED EXPANSION CHAMBER PORTION, AND A NEEDLE MOUNTED IN SAID BOTTOM AND FLUSH THEREWITH, WHEREBY TO FIRMLY MOUNT THE NEEDLE ON SAID TUBULAR BODY, SEAL THE DIAPHRAGM AT THE BOTTOM THEREOF, AND AVOID ANY CONTACT OF SAID NEEDLE WITH SAID DIAPHRAGM.