Abstract: A multiple dose, single barrel syringe has a barrel comprising a plurality of telescoping sections of progressively decreasing diameter. A puncturable fluid tight membrane extending across the forward end of each barrel section except the first divides the interior of the barrel into a plurality of separate fluid receiving chambers, each of which may contain a different fluid medication. A plunger is slidably mounted in the last barrel section and extends exteriorly therefrom. At the forward end of the syringe is a hollow needle, which extends through a needle-receiving tubular conduit at the forward end of the first barrel section so that the needle is disposed partly inside and partly outside the barrel. Both ends of the needle are sharply pointed. The inner end of the needle punctures the membranes so that, as each chamber in the barrel is emptied, the next chamber is placed in communication with the needle.

Abstract: Disclosed is a syringe having two or more barrels for injection of two or more liquids into a patient in predetermined sequence. The syringe includes a valve, either a slide valve or a rotary valve, which places the barrels one at a time in predetermined sequence in communication in the needle of the syringe. Preferably the syringe is prefilled with the desired injectable liquids and the valve is preset so that the barrel containing the first liquid to be dispensed is in communication in the needle.

Abstract: Dual syringe for either simultaneous or sequential injection of two different injectable liquids. The syringe includes two barrels, each having a plunger for the injection of liquid, and a manually operable three-position rotary valve which controls the filling of the syringe and the outflow of liquid from the syringe. The three positions of the valve permit liquid to be dispensed either from the first barrel only, the second barrel only, or both barrels simultaneously.