Hypodermic syringe body structure

Claim 1

A hypodermic syringe body structure for association with a liquid medicament container of the type including a pierceable stopper having a connector thereon, said body structure comprising a molded plastic barrel member having an open end, a base opposite said open end having an aperture therethrough and an integral guide sleeve surrounding the aperture in the base and extending axially inwardly of said base a distance that is relatively short in relation to the axial extent of said barrel member, a one-piece molded plastic inner tubular member having a hollow interior and at least a portion thereof fitting within said guide sleeve and an end portion having a connector for coupling engagement with a stopper of such a medicament container, said end portion terminating at least approximately in the plane of the open end of said barrel and comprising an enlarged, internally threaded, integrally formed plastic portion of said inner tubular member, a hollow, plastic, stopper piercing spike coaxially disposed within said enlarged internally threaded portion integrally formed of the plastic of the tubular member and in fluid communication with the hollow interior of the inner tubular member, one of said barrel member and inner tubular member having an integral tubular extension projecting outwardly of the aperture in said base, said tubular extension being in fluid communication with the hollow interior of the inner tubular member, said tubular extension having a frangible portion outwards of said base of said barrel member, means operatively connected with said tubular extension outwards of said frangible portion for receiving an end portion of a cannula, said barrel member and inner tubular member having mutual facing bonding surfaces, and means effectively bonding said barrel member and tubular member together.