Plastic cartridge needle assembly

Claim 1

A CARTRIDGE-NEEDLE ASSEMBLY WHICH COMPRISES IN COMBINATION: A PLASTIC CARTRIDGE ADAPTED TO RETAIN A FLUID THEREIN FORMED OF A SUBSTANTIALLY HARD PLASTIC MATERIAL WHICH HAS LOW VAPOR TRANSMISSION PROPERTIES AND WHICH IN SECTIONS READILY PIERCEABLE BY A HYPODERMIC NEEDLE IS INHERENTLY LACKING IN ABILITY TO FORM A PERMANENT SEALING ENGAGEMENT WITH A HYPODERMIC NEEDLE CANNULA, SAID CARTRIDGE HAVING A CYLINDRICAL LATERAL WALL SECTION WITH A PISTON MEANS SLIDABLY MOUNTED THEREIN AND HAVING ONE END OF SAID CYLINDRICAL LATERAL WALL SECTION SEALABLY CLOSED BY A READILY PIERCEABLE PLASTIC DIAPHRAGM END WALL SECTION INTEGRAL WITH CONTIGUOUS PORTIONS OF SAID CYLINDRICAL LATERAL WALL SECTION AND BEING FORMED OF SAID SUBSTANTIALLY HARD PLASTIC MATERIAL, AND A CARTRIDGE-NEEDLE SUPPORT MEMBER HAVING A CYLINDRICAL SLEEVE SECTION IN WHICH SAID CARTRIDGE IS SUPPORTED WITH ONE END OF SAID SLEEVE SECTION OPEN TO RECEIVE SAID CARTRIDGE AND THE OTHER END CLOSED BY A SLEEVE END WALL ADAPTED TO SUPPORT A DIAPHRAGM PIERCING NEEDLE CANNULA WITH ONE END OF SAID CANNULA EXTENDABLE AXIALLY WITHIN SAID SLEEVE SECTION, AND SAID SLEEVE SECTION HAVING FORMED AT THE END THEREOF ADJACENT SAID SLEEVE END WALL A REDUCED DIAMETER SECTION PROVIDING A SLEEVE LATERAL WALL SECTION ENGAGEABLE WITH SAID CYLINDRICAL LATERAL WALL SECTION ADJACENT SAID ONE END TO FORM A FLUID SEALING ENGAGEMENT BETWEEN SAID LATERAL WALL SECTIONS OF SAID CARTRIDGE AND SAID SLEEVE SECTION FOR RETAINING WITHIN SAID SLEEVE SECTION FLUID LEAKING FROM SAID DIAPHRAGM SECTION WHEN SAID CARTRIDGE AND CANNULA ARE DISPOSED IN DIAPHRAGM PIERCING SEATING ENGAGEMENT WITHIN SAID SLEEVE SECTION.