Blood absorption during 970 and 1470 nm laser radiation in vitro

Aim. Soon after introduction of water lasers in medical practice for EVLA, less power and energy line density have been used. However, there are no experimental grounds for different energy modes and there is no clear evidence for a difference in the effect of the two wavelengths dealt with in this study. The goal of this study was to evaluate the temperature profile of various laser action modes with testing devices. Methods. Three experimental testing devices consisted of cylinders filled with whole donor blood and a set of temperature sensors installed in different positions. Results. We have determined the range of temperatures around the fiber tip of 970 and 1470 nm lasers. The average temperature of 970 nm laser at 1 mm distance along the axis from the fiber tip substantially differed from that of 1470 nm laser, power being equal. Conclusion. Statistically substantial differences were found in endovenous laser ablation simulation in vitro for the 970 um and 1470 nm laser radiation. Similar temperatures can be reached with 970 nm lasers if power is increased.