The ideal retrieval window for a retrievable IVC filter is generally within 6 months of implantation, before struts begin embedding in the vena cava wall. When retrieval is attempted beyond this window — or when struts have already fractured or penetrated the vessel — the procedure becomes substantially more dangerous. Failed retrieval attempts that leave struts in place, or high-risk open surgical extractions required because standard endovascular approaches failed, constitute independent compensable injuries in IVC filter litigation. Patients who underwent multiple retrieval attempts, or who were told their filter could not be safely removed, may have particularly strong claims.