The endovenous laser is one that we put inside the vein in order to close off those big veins that are damaged and hurting the patient. This is a different laser than the skin laser which is sometimes used on spider veins. The endovenous laser creates a concentrated light that creates intense heat. The laser I use produces a wave length that targets water. Since water is the main component of the cells of the vein, the heat is distributed to these cells and permanently damages them, resulting in contraction, scarring and closing of the vein.