Pressurized sub-cooled cryogenic system and method of use

A cryogenic system comprising:

• a reservoir containing a liquid cryogen;
• an enclosure in which the reservoir is disposed;
• a heat exchange coil immersed in a pressurized cryogen, wherein the pressurized cryogen is supplied to the heat exchange coil and is cooled under pressure to produce a pressurized mixed phase cryogen within the heat exchange coil;
• a cryoprobe fluidly connected to the heat exchange coil by a supply line such that the pressurized mixed phase cryogen is delivered to the cryoprobe, wherein the cryoprobe further comprises;
• an umbilical line coupled to the enclosure;
• a probe handle coupled to the umbilical line;
• and
• a probe shaft having an outer sheath disposed thereon, the probe shaft extending from the probe handle, wherein the supply line is disposed within the umbilical, the probe handle, and the probe shaft, placing the cryoprobe in fluid communication with the heat exchange coil within the enclosure;
• and
• a vacuum lumen disposed within the probe shaft;
• a return line configured to conduct the used cryogen away from the cryoprobe, wherein the return line conducts the used cryogen to a heat exchanger venting system.