A cryoablation device having a temperature control system includes an elongated catheter tube that has a central lumen and is formed with a closed distal tip. The distal end of a refrigerant supply line is positioned in the central lumen and distanced from the catheter tube's distal tip to establish...http://www.google.com.au/patents/US7357797?utm_source=gb-gplus-sharePatent US7357797 - System and method for varying return pressure to control tip temperature of a cryoablation catheter
