Patent ID: 6890347

Claim:
A cassette for supplying heat exchange fluid to a heat exchange catheter, said cassette comprising: an external heat exchanger comprising a relatively stiff structural member and a compliant member, said compliant member sealed to said structural member in a pattern, said pattern forming a flow channel having an inlet and an outlet; a first fluid supply line, said first fluid supply line in fluid communication with said flow channel inlet; a bulkhead, said bulkhead comprising a reservoir and a disposable pump head, said reservoir containing an inlet in fluid communication with said flow channel outlet, said reservoir further having a fluid level detector for detecting the level of fluid within said reservoir, said pump head being a cardioid vane pump head, said pump head actuated by an electric motor, said pump head having an inlet and an outlet, and said pump inlet in fluid communication with said reservoir outlet, said electric motor is controlled by an amplifier controller, said amplifier controller supplying a constant current to said pump head thereby causing said pump head to supply a relatively constant pressure to said fluid in said second fluid supply line; a second fluid supply line, said second fluid supply line in fluid communication with said pump outlet for receiving fluid pumped out of said pump outlet; an external fluid source, said external fluid source in fluid communication with said reservoir; and a pressure damper, said pressure damper in fluid communication with said pump outlet.