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Phlebology — RFA (RFA, RFO or radiofrequency obliteration (ablation) of veins of lower extremities — an advanced and promising method of removal of varicose veins of legs. In most cases, the method is an alternative to classical surgery. This method stipulates heating of the bad vein wall with a thermal wave and full patching of the vessel lumen. Indications for this surgery are determined after examination by a phlebologist and ultrasound of veins of lower extremities. The surgery can be carried out under local anesthesia or intravenous sedation (medication sleep). The session of radiofrequency ablation of veins of lower extremities (RFA) is conducted as follows: at the level of the reflux lower border, vein puncture is performed, a disposable catheter with a special bipolar electrode (VNUS Closure FAST™ catheter) is inserted and moved under ultrasound control along the saphena to the mouth of inflow into a deep vein. Then step-by-step patching of the saphena. The sensors built into the catheter allow for automatic correction of radiation intensity. Upon completion of the session, the catheter is removed, and the patient can go home after a short rest).