A Refrigeration Source for a Cryoablation Catheter

摘要

A supply line (46) is positioned inside a lumen (50) of catheter tube. A precooler cools fluid refrigerant passing through proximal end (38) of supply line at a specified temperature (Pw) and flows out from distal end (36) of supply line into tip section (56) of catheter tube. An exhaust unit evaluates the fluid refrigerant from catheter tube and maintains a specified value of outflow pressure in the tip section. An independent claim is included for method for cooling tip section of cryoablation catheter.