Abstract: A medical syringe for collecting blood samples, including a cylindrical body having an open proximal end , a closed distal end, and a distal opening. A plunger assembly has a distal portion that is slidably disposed in the proximal end of the cylindrical body, thereby defining a fluid chamber between the distal portion and the distal end of the cylindrical body. The plunger assembly has a proximal portion with a cavity therein. A conduit extends from the fluid chamber proximally through the distal portion to the cavity. A penetrable seal, such as a multi-sample luer adapter, is fixed in the cavity, thereby sealing the conduit from retrograde flow of air. Fluid may be drawn into the fluid chamber, a vacuum specimen tube may be inserted into the cavity, and the penetrable seal penetrated to provide fluid-tight communication between the conduit and the specimen tube, fluid being preferentially drawn into the specimen tube from the fluid chamber.

Abstract: A medical syringe for collecting blood samples is provided, comprising a cylindrical body having an open end and a closed end. A plunger assembly including a piston is slidably inserted into the open end, defining a fluid chamber between the piston face and the closed end. A distal opening in the closed end provides passage between the syringe and a patient, and includes a restriction therein. A conduit extends from the fluid chamber through the plunger assembly to a tube-holding device, or may extend peripherally from the cylindrical body to the tube-holding device. Fluid is drawn into the fluid chamber, and a vacuum specimen tube is inserted into the tube-holding device, the vacuum drawing fluid into the tube. The restriction in the distal opening imposes a viscous resistance to flow, slowing blood flow into the syringe, preferentially drawing fluid into the specimen tube from the fluid chamber, and decelerating movement of the plunger assembly.

Abstract: A disposable syringe for the dual extraction of arterial blood or venous blood into the barrel of said disposable syringe and a plurality of vacuum glass tubes.