Methods and systems for detecting fluid egress, assessing lesion quality, determining tissue composition or structure, determining ice coverage of catheter tip and providing tissue contact assessment, by providing a catheter having a shaft with a proximal end portion and a distal end portion, the proximal...http://www.google.com.au/patents/US7842031?utm_source=gb-gplus-sharePatent US7842031 - Bioimpedance measurement system and method
