Abstract: A device for occluding abnormal vessel communications is of the type comprised by a wire which, being pre-formed as a means of endo-luminal blocking and being stretchable in the direction of its longitudinal axis, has heat-sensitive resilient memory; said wire, which is to be introduced into an abnormal vessel communication, such as that produced between arteries and veins, or between systemic arterial circulation and pulmonary circulation, is characterized in that the wire is shaped as a conical spiral, the apex of which is followed by a terminal portion of the same wire, bent as a hook; such that the loops of said wire define portions of different diameter, which may be adapted to the vessel gap or passage, while the end as a hook is a means for anchoring the occluding device, emerging through the smaller end of the lumen.