Filter for inserting in main artery

摘要

The filter is made from flexible wire shaped elements which are connected at their ends. Each element is bent into a spiral shape along its centre line (6). Each element (2,3) is bent into a zigzag shape so that points (25) are formed The zigzag bends in one element (2) face in the opposite direction to those in the other element (3) so that the points 925) point away from one another. The straight sections of the elements cross one another