Abstract: A blood sampling apparatus that includes a low dead space-sampling device, which is of a unitary construction that can be interposed as a single unit into an infusion line between a source of fluid and the patient. The unitary sampling device includes an elongated body having a fluid passageway there through, the fluid passageway having first and second ends, a stopcock assembly connected to the elongated body intermediate the first and second ends and a sampling port assembly having a body portion that is integrally formed with the elongated body intermediate the stopcock assembly and the second end of the elongated body.

Abstract: A thermodilution injectate assembly which includes a length of flexible tubing for introducing fluid from a solution container to the assembly. An insulated container which holds a heat exchange medium and into which is positioned a substantially flat plate heat exchanger. The heat exchanger includes an inlet port and an outlet port and a fluid-flow path therebetween, which path provides a heat exchange relationship between fluid flowing through the path and the heat exchange medium. A dual directional valve is connected to the outlet port of the heat exchanger and to the solution container. A three-ported stopcock is in fluid-flow communication with the dual directional valve. A syringe is connected to a port on the three-ported stopcock and a length of flexible tubing is connected to a port on the three-ported stopcock for delivering the cooled fluid to a patient for monitoring the cardiac output.