. . . "In still another configuration, struts 52 are extensions of filter 50 that extend to head 44 and connect thereto. [0122] As illustrated, each strut 52 is formed from Nitinol, stainless steel, metals, alloys, composites, plastics, polymers, synthetic materials, combinations thereof, or other materials that allow struts to perform one or more of the functions described herein." . . . .