Endovenous Laser Ablation of the Surface Tributaries of the Main Veins |Biomedgrid

Using optical methods and ultrasound diagnostics, we studied thermal and transport processes caused by boiling of blood inside pathologically altered surface tributaries of the main veins under the action of continuous near-IR laser radiation (1.47 - 1.56 microns) delivered via an end-type optical fiber. These processes were investigated during the experiments with non-aerated water, as well as the clinical procedure of laser endovenous thermal ablation of the surface tributaries of the lower extremities' main veins. In the proposed approach, thermal modification (ablation and fibrosis) of pathologically altered vessels occurs as a result of blood boiling in the vein lumen with the generation of heated flooded jets that move from the heat source (the end of the fiber), transferring the heated fluid to the venous walls. Jets, as a phenomenon of forced convection, provide the fastest possible transfer of the heat of boiling blood to the endothelial lining and intima of veins.