CRYOGENIC SPRAYER Russian patent published in 2007 - IPC A61B18/02 F25D3/10 

FIELD: medicine; cryogenic technology.

SUBSTANCE: cryogenic sprayer can be used for local cooling of biological tissue. Cryogenic sprayer has container for refrigerating agent, which is connected with open tip through channel for feeding refrigerating medium. Container for refrigerating medium is provided with air-proof cap, inside cavity of which the heat-exchange chamber is placed. Chamber is made in form of thin-walled sleeve made of heat-conducting material; chamber is soldered to walls of air-proof cap of sleeve. Sleeve has widened open end made for installation of cone-shaped plug into it; plug has pipe, which is inserted in axial to elastic pipe. Pipe is connected with pressure raise source. Elastic pipe is provided with outlet branch pipe having valve. Rod is mounted in cavity of thin-walled sleeve; rod is connected with cavity. There is saw cut in lower part of rod. Air-supplying pipe is introduced from container for keeping refrigerating medium into sleeve behind rod. L-shaped part of channel for supplying refrigerating medium goes though sleeve and it is soldered to its walls. Sleeve is made of heat-conducting material and is provided with longitudinal knurl to form internal ribs. Open tip is fastened to L-shaped part of channel for supplying refrigerating medium by means of hose; electro-conducting spiral is reeled upon internal surface of hose. Spiral is connected with portable power supply Open tip is made in form of cylindrical pipe which changes from distal part to jet where rod is mounted. Jet is provided with removable gasket made of heat-insulating material; jet is made in form of cylinder with windows. Efficiency of operation is improved due to more uniform and qualitative formation of fine-dispersed aerosol of refrigerating medium.

EFFECT: improved efficiency of operation.