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There are considered characteristics of the laser medical devices working at the wavelengths 1.94; 2.01 and 2.1 µm, which are used in urology for surgical operations. It is shown that unlike action in the air environment, section of the biotissue in the water environment (physiological solution) is performed by the steam-gas stream which is formed as a result of superintensive boiling in thin (about 0.1 mm) a liquid layer in which absorbed laser radiation. Coagulation of the biotissue, adjacent to a section, happens due to heat which is produced via vapor condensation.