be able to avoid recanalization with any suitable degree of certainty because the section 4 places itself across the vessel to be occluded the occlusion can be performed solely by means of the wire body thus there is no need to use the formerly known occlusion hairs of silk or dacron to occlude the vessel center this means that the embolization device according to the invention when it is free of occlusion hairs can be inserted through a catheter with advantageously smaller inner lumen than the known embolization coils with hairs because no space is required inside the catheter for the hairs as these hairs also generate an unfortunate high friction between the coil and the inner surface of the catheter the device according to the invention is easier to advance through the catheter this can be utilized to place wire members of a greater length and or of lower rigidity if a further advantageous reduction of the friction is desired the inner surface of the catheter or possibly the wire body itself may be coated with a friction reducing coating such as a ptfe coating or a hydrophilic coating naturally it is possible within the scope of the invention to provide the wire body with occlusion hairs but it is not preferred for the above reasons a number of experiments have been carried out to find suitable rigidities of section 4 of the wire body so that it obtains the desired vessel wall seeking rigidity without becoming so stiff that the outward pressure on the vessel wall becomes too high the experiments were carried out with helically wound platinum threads for different thread diameters d.