The present invention is of device, system, and method for cooling and heatingan operating tip of a cryoprobe using a single source of compressed gas.Cooling of the operating tip is effected by Joule-Thomson expansion of a high-pressure cooling gas through a Joule-Thomson orifice into an expansionchamber. Heating of the operating tip is effected by electrical resistanceheating. In preferred embodiments, heating of the operating tip is effected byelectrical resistance heating of low-pressure gas flowing towards theoperating tip. Preferably, gas from a single gas source is supplied to theprobe during both cooling and heating phases, a cooling gas being supplied athigh pressure when used for cooling and at low pressure when used for heating.Low-pressure gas supplied during the heating phase is heated as it flowstowards the operating tip, preferably by electrical resistance heating withinthe body of the probe. A single gas input lumen is used during both coolingand heating phases to transport gas into the probe, and a single gas exhaustlumen is used during both cooling and heating phases to conduct gas out of theprobe.
