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Figure 3 Potential failure mode—lack of filter apposition against the vessel wall. (A) Post-stenting of the mid shaft of the saphenous vein graft to the right coronary artery (black arrow) with the FilterWire in place (white arrow). (B) Magnification of panel A—the nitinol loop of the FilterWire may be seen. (C) Further magnification and enhancement of the FilterWire, showing that the nitinol loop (black arrow) and collection filter (cross hatched net) are clearly lifted off the inferior wall of the vein graft, likely due to geometric wire bias resulting from placement of the distal wire tip in the posterolateral branch (white arrow). Relocating the guidewire tip into the more inferior posterior descending artery may have apposed the filter loop against the vein graft wall.