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Figure 4 Potential failure mode—excessively distal lesion resulting in incomplete filter opening or unprotected native side branches. (A) Ulcerated lesion (arrow) in the distal shaft of the saphenous vein graft to the obtuse marginal branch of the left circumflex artery. (B) FilterWire deployed, with the distal nitinol loop protruding into the upper branch of the bifurcating obtuse marginal (arrow). (C) As a result, the polyurethane collection filter (arrow and cross hatched net) cannot open fully and is compressed in the undersized branch (<3.0 cm), impairing particulate recovery both in the partially protected superior branch and unprotected inferior branch.