So-called radial laser systems are used to treat diseased vein sections. This is a procedure in which laser energy is emitted at the diseased vein wall. Due to the resulting thermal effect, the diseased vein can be treated well. It is irrelevant here how large the diameter of the corresponding vein is. Therefore, they can be used for both severe cases of varicose veins as well as for varicose veins that are in the very early stages of development. This also includes varicose veins developed after a previous operation (recurrent varicose veins).