DIFFUSE CIRCULAR FIBER TYPE FOR TUMOR LASER SURGERY Obtained a patent of the Republic of Belarus. Appointment removal of small tumors (from 2 to 10 mm), vascular microsurgery. Special features interstitial application through a needle or endoscope, maltraumatic treatment, application through any type of endoscopes, the possibility of palliative multiple treatment. Radiation spherical (circular) with uniform distribution. Diameter of tip 0,4 mm, 0,6 mm, 1 mm. Diameter of optical fiber 300, 400, 500, 600 mkm. Radiation power up to 30 W. Peak power up to 10 000 W. Application disposable or reusable (up to 50 operations). The probability of successful implementation of the project is 95%.