Patent ID: 7942892

Claim:
A radiopaque, expandable frame for an embolic filtering device used to capture embolic debris in a body lumen, the frame comprising: two half frames having respective proximal and distal portions, the half frames being movable between an unexpanded position and an expanded position, wherein each half frame includes: first and second control arms, a partial hoop extending in a circumferential direction between the first and second control arms, and a substantially D-shaped flex region extending substantially perpendicular to the partial hoop and located at or near an apex of the partial hoop, the partial hoops of the first and second control arms defining a circular hoop; wherein each of the first and second control arms include a proximal angled portion extending away from a longitudinal axis of the frame and a distal portion configured to contact a body lumen wall and extending substantially parallel to the longitudinal axis; a polymeric filtering element having an expandable proximal end and a substantially closed distal end disposed on the half frames, wherein the polymeric filtering element includes a plurality of holes formed in rows extending between the proximal end and the distal end with the holes being arranged such that holes in adjacent rows are offset relative to one another; and a collar disposed proximal to the filtering element, wherein: the proximal portions of the half frames are coupled to the collar; the frame is formed of a cold-worked linear pseudoelastic alloy, the alloy having a martensitic phase in the unexpanded and expanded position; and the alloy further includes at least one ternary element selected from the group of elements consisting of iridium, platinum, gold, rhenium, tungsten, rhodium, tantalum, silver, ruthenium, or hafnium.