Heat transfer catheter apparatus and methods of making and using same are disclosed wherein a fluid connection is provided between the distal portions of two adjacent, thin-walled, high strength fluid lumens to define a closed loop fluid circulation system capable of controlled delivery of thermal energy...http://www.google.co.uk/patents/US6440158?utm_source=gb-gplus-sharePatent US6440158 - Heat transfer catheter apparatus and method of making and using same
