Key evidence in an IVC filter lawsuit includes: (1) Implant records — operative report or device sticker from your implant procedure identifying the filter manufacturer, model, and lot number; (2) Imaging — CT scan, plain abdominal or chest X-ray, or fluoroscopic imaging confirming fracture, strut separation, migration, tilt, or perforation; (3) Treatment records — all medical records related to complications, including emergency department visits, cardiac procedures, and retrieval attempts; (4) Operative reports — if surgical removal was attempted or performed, the operative report is critical evidence; (5) Death records — if a family member died from cardiac or pulmonary complications attributable to an IVC filter, autopsy reports and death certificates support wrongful death claims.