Hypodermic syringe holder

Claim 1

A syringe body adapted to be used with a prefilled cylindrical cartridge-cannula unit comprising: a cartridge holding barrel having a cylindrical bore in its main body that is adapted to hold the cartridge, the barrel being open at one end for receiving the cartridge and partially closed at the opposite end by an end wall that limits axial movement of the cartridge, the barrel having an extension on the partially closed end, which extension has a cylindrical bore coaxial with the bore of the barrel, the extension's bore being of sufficiently large diameter so that the cannula and sheath of the cartridge can pass freely through it but of adequately restricted diameter to prevent excessive angular displacement of the cannula, thereby preventing the cannula from breaking from the cartridge, a push rod guiding sleeve, a push rod slidably mounted in the sleeve, and hinge means connecting the cartridge holding barrel to the push rod guiding sleeve so that the barrel can be rotated between an operation position in which its bore is coaxial with and opposed to the push rod and a loading position in which its bore is unobstructed, the push rod guiding sleeve including a partially open extension disposed adjacent to the open end of the barrel when in the operation position, the partially open section defining undercuts adapted to receive the exposed, plunger end, of the cartridge with a snap fit when it is rotated into operation position, thereby preventing unintended rotation of the cartridge out of the operation position.