[Features of thermal effect at high-frequency laser impact on biological tissue (experiment). Technique of laser ablation of a pharyngeal tonsil].

In the conditions of the experiment the peculiarities of thermal influence of Ho:YAG on biological tissue in the ablation mode were studied. In the experiment we used: surgical laser system LUMENIS VersaPulse PowerSuite 20, universal thermal imaging camera FLIR SC7000. The biological object (turkey meat) was remotely, at a distance of 5 mm, affected by a Holmium laser (E = 0.9 J and R = 12 Hz) for 6 seconds. The maximum temperature (Tmax, °C) in the ablation zone was measured in real time. As a result, it was found that laser ablation of a biological object is characterized by thermal effects, which largely depend on the state of irradiated tissue: the temperature of the irradiated object rises to critical values equal to 100.07-111.24 ° C, after which the surface layer of biological tissue is charred, and the process of laser "removal" stops; intact biological tissue reaches critical heating after 3.48 s, while under the influence of a high-frequency laser on the previously irradiated biological tissue development period It was also established that in order to continue laser ablation with controlled thermal effect it is necessary to remove charred areas of biological object. On the basis of the obtained data the method of laser ablation of pharyngeal tonsils was developed.