Shot gun syringe with cartridge and scabbards

An assembly for injecting measured fluid medications comprising, in combination:

• (a) a transparent medicament containing cartridge, said cartridge comprising a cylindrical body portion having a leading end forming a conical hub;
• a beveled-tip needle permanently attached in said conical hub;
• a trailing end terminating in a circular flange, said circular flange having a greater outer diameter than the outer diameter of the body portion, said circular flange having a single longitudinal gap therein;
• and an inside piston having a trailing threaded member projecting therefrom;
• and
• (b) a breech-loading syringe comprising a thumb-activated plunger, said plunger having a leading end with a threaded member mating with said trailing threaded member on said inside piston and a trailing end terminating in a thumb-ring;
• the breech-loading syringe also comprising a leading end whose circular aperture precisely fits the base of said conical hub of said cartridge, a trailing hollow cylindrical barrel dimensioned to accommodate said body portion of said cartridge within the barrel, said barrel having an expanded trailing chamber portion, said expanded trailing chamber portion having a projection on the trailing surface thereof and an indentation substantially 180.degree. from said projection, said indentation providing mechanical access to the said trailing terminal circular flange of said cartridge, said projection being dimensioned to matingly engage said single longitudinal gap in said trailing terminal circular flange of said cartridge when the leading end and body of said cartridge is fully inserted into said barrel;
• said cartridge being secured within said syringe by a hinged breech block portion containing an axial passage therethrough holding said thumb-activated plunger and a latch which latches to cover said expanded trailing chamber.