Patent 6881218 was granted and assigned to AngioDynamics on April, 2005 by the United States Patent and Trademark Office.
The filter is composed of two portions. A first portion is a set of zi-zag struts arranged in a cylindrical fashion which fit against the wall of the vascular lumen and provide a base for positioning a filter portion. A filter portion is a set of struts. Each filtering strut has its upstream end connected to the positioning portion at the vascular wall and its downstream end held at a central position in the vascular lumen by a frangible connector or cord.