CRYOSURGICAL APPARATUS OPERATING WITH ETHANOL

The article deals with sealed cryosurgical devices operating on the solid ethyl alcohol. The equations that define the heat flows passing from the object which is freezing through the cryocatheter (copper rod) to the liquid and then to a solid alcohol are given. To describe the process of cooling, freezing and undercooling of solid object the concept of equivalent thermal conductivity was introduced in cryosurgery. Varying in time heat fluxes, the thickness of the liquid alcohol and temperature losses on cryocatheter and liquid alcohol were defined. These estimated equations allow you to select the device design for various cryosurgery objects, e.g. apparatus for cryosurgical operation of tonsillar. The calculations were performed for the case of non-finned rod. Before the operation the unit was removed from the outer insulation and the apparatus together with the alcohol in the chamber was frozen to the alcohol freezing point (156 K).