Method for a central venous line catheter having a temperature control system

An apparatus for delivery of thermal treatment and medication to a selected area in the vascular system of a patient, comprising:

• an elongated flexible catheter assembly;
• a heat transfer element on a distal portion of said catheter assembly insertable to said selected area in said vascular system;
• a temperature control lumen within said catheter assembly, said temperature control lumen being in fluid flow communication with said heat transfer element, to supply a temperature controlled fluid to said heat transfer element;
• a medicament delivery lumen within said catheter assembly, said medicament delivery lumen being in fluid flow communication with said distal portion of said catheter assembly, to deliver a medicament to said distal portion of said catheter assembly;
• a return lumen in said catheter assembly, said return lumen being in fluid flow communication with said heat transfer element, to receive said temperature controlled fluid from said heat transfer element;
• and
• an exit port in said distal portion of said catheter assembly, said exit port being in fluid flow communication with said medicament delivery lumen to allow said medicament to exit said catheter assembly in the proximity of said heat transfer element.