Abstract: A cardioplegia delivery device for providing variable ratio delivery of blood and cardioplegia solution to a patient. The device includes separate pumps for crystalloid and blood. A heat exchanger control circuit is provided which includes a heater and an ice bath for warming or cooling the cardioplegia fluid delivered to the patient. The heat exchanger control circuit includes a priming circuit which may be used to purge air bubbles from the circuit.

Abstract: A cardioplegia delivery system which includes a first delivery unit adapted for connection in a manner allowing delivery of cardioplegia fluid to a patient's heart during surgery. A second delivery unit may be added to the cardioplegia delivery system. The second delivery unit includes a heat exchanger for controlling the temperature of the cardioplegia fluid. The second delivery unit may be connected during the surgical procedure to allow conversion from warm cardioplegia delivery to cold cardioplegia.

Abstract: A cardioplegia delivery device and method of use for delivering warm or cold cardioplegia fluid to the heart of a patient. The delivery device includes an air chamber having a housing with an integral pressure relief valve for diversion of cardioplegia fluid if the fluid pressure within the housing exceeds a predetermined pressure. The air chamber includes a membrane and one-way valve located near the top of the housing for removal of air from the cardioplegia fluid. The delivery device may include an integral heat exchanger for controlling the temperature of the cardioplegia fluid.