A cryosurgical instrument comprises a metal cooling tip operable to be cooled by a flow of cryogenic fluid within the tip, at least a boiling region of the tip being coated with a heat-insulating coating. The presence of the heat-insulating coating can promote nucleate boiling of the fluid rather than...http://www.google.fr/patents/US5860970?utm_source=gb-gplus-shareBrevet US5860970 - Cryosurgical instrument
