Cryogenic applicator

A cryogenic applicator, comprising:

• a vessel for holding a cryogenic fluid;
• a vacuum casing housing the vessel;
• a forming capillary which is encased by a feeding capillary along the entire length of the forming capillary within the vessel,
• a thermostatic capillary which encases the feeding capillary along the entire length of the feeding capillary within the vessel;
• a conduit extending from a bottom of the vacuum casing;
• an evaporation chamber at the end of the conduit and in which an outlet of the the feeding capillary and an outlet of the forming capillary terminate;
• and
• a rotating roller comprising a porous biocompatible material and mounted around the evaporation chamber;
• wherein the evaporation chamber has radial holes extending from an interior of the evaporation chamber to an exterior of the evaporation chamber and configured to allow transport of the cryogenic fluid from an outlet of the forming capillary through the radial holes to an inner surface of the porous biocompatible material,
• wherein the porous biocompatible material is configured to enable liquid nitrogen to pass through pores of the porous biocompatible material from the interior surface of the porous biocompatible material to an exterior surface of the porous biocompatible material,
• wherein an inlet of the feeding capillary is in a filter within the vessel and is cut at a slanted angle with respect to its longitudinal axis, and
• wherein each of the feeding capillary, the forming capillary, and the thermostatic capillary extend upward from the filter and all together form a U-bend near the top of the vessel and each extend to the bottom of the vessel.