THE STUDY OF THE TEMPERATURE FIELD IN THE SKIN COVER WHEN DISPERSING GAS MIXTURES TO -35.5; -25.0; -15.0°C TEMPERATURE LEVEL FOR APPLICATION IN CRYOMEDICINE AND CRYOTHERAPY

摘要

Experimental data have been obtained on gas jet temperature distribution in various volume points when propane/butane/R123 cooling mixture throttling to -35.5; -25.0; -15.0°C temperature level from the nozzle at 0.1; 0.5; 1.0 mm diameter. The mixture was used for medical purposes. Also the study of the temperature field on the skin cover when dispersing cooling gas mixtures to -35.5; -25.0; -15.0°C temperature level has been carried out. Gas mixtures were propane-butane (40/60% mole); propane/butane/R123 (12/18/70% mole); propane/butane/R123 (28/42/30% mole) dispersed from the nozzle at 0.1; 0.5; 1.0 mm diameter from the distance of 5; 50; 150; 200; 250; 300 mm. Obtained data allow raising the accuracy and the effectiveness of cooling spray application, evaluating and choosing efficient convection conditions in order to cool biotissue as well as defining the limit safe cooling period of the given biotissue area (skin, mucous tunic) which ends at the moment of the tissue freezing. A laboratory bench was developed to automate the work to investigate a gas jet thermodynamic parameters. The description of cooling spray for athletes "Ice wave" (pre-production models) is given. The pre-production models were made in the Vekshinski Institute. The method is suggested to use the aerosol with special gauze plasters which retain refrigerating medium after spraying. Thus the cooling effect is prolonged several times as much.