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The Medtronic CardioTherm™ Blood Cardioplegia System is intended for mixing, cooling, warming, and delivery of oxygenated blood and/or asanguineous cardioplegia solution.

Each Medtronic CardioTherm™ Blood Cardioplegia System is a single use, disposable device designed to mix arterial blood from an oxygenator with asanguineous cardioplegia solution in specific ratios devending on the tubing set configurations. The blood/cardioplegia solution is then cooled/warmed and delivered to the patient. The Medtronic CardioTherm™ Cardioplegia Heat Exchanger consists of a polycarbonate housing which incorporates a bubble chamber. A stopcock is attached to the upper luer port of the housing lid allowing for air venting through a purge line during priming and pressure monitoring through a vented or nonvented pressure monitoring line throughout the procedure. A temperature probe port is located adjacent to the blood outlet port at the bottom of the device, allowing for temperature monitoring of the blood/cardioplegia solution prior to patient delivery. The heat exchanger housing contains nonporous polypropylene hollow fibers, which are supported on their exterior by a polyethylene screen. These polypropylene fibers run longitudinally through the polycarbonate chamber. Blood/cardioplegia solution flows through the polypropylene hollow fibers. The walls of these fibers provide a barrier between the blood/cardioplegia solution and the cooling/warming water.