The possibility of endovenous laser coagulation using Ti-containing optothermal fiber converters (TOTFC) is discussed. Optical and thermal models have been developed to estimate the distribution of radiation and temperature in the vein during endovenous laser coagulation when using TOTFC for 532 nm, 810 nm, 980 nm, 1064 nm, 1310 nm, 1470 nm, 1910 nm and 2100 nm wavelengths. Radiation intensity distributions around the TOTFC and on the vessel wall were obtained and evaluated. The absorbance efficiency of laser energy with different wavelengths for TOTFC has been calculated. As a result of the thermal calculation, for different wavelengths, average laser power from 8 to 15 W with traction speed from 1 to 7 mm/s, the thermodynamics of the blood vessel wall and TOTFC was determined. During endovenous laser coagulation temperature inside TOTFC exceeds 500°C. The optimal combinations of average laser power and titanium-containing converter traction speed are defined for coagulation of the vein wall.
The possibility of endovenous laser coagulation using C-doped and Ti-doped optothermal fiber converters is discussed. Optical and thermal models have been developed to estimate the distribution of light and temperature in the vein at endovenous laser coagulation using a 980 nm diode laser. It is shown that the distribution of light in the vein when using Ti-doped converter is significantly different from the distribution obtained using C-doped converter and clear quartz fiber. As a result of the thermal calculation, for 980 nm laser power equal to 20 W, the dynamic of blood vessel wall temperature was determined. The effect of blood flow speed (1.5 mm/s) on the temperature of the vein wall was taken to account. It is shown that the blood vessel wall can be heated up to a temperature of 80 °C, which is needed for collapse of the vein, after 21 seconds of laser exposure by C-doped converter and after 43 seconds of laser exposure by Ti-doped converter at endovenous 980 nm laser coagulation of vein with a diameter 5 mm.
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