Conical endocaval filters with metallic struts: search for a new model

The multitude of caval filters now available and conflicting experimental and clinical findings indicate that no one model can be considered to be perfect. The principal drawbacks of conical endocaval filters, such as the Greenfield model, are the possibility of migration and tilting, often related to failure to open, or untimely ejection of the filter. In this study, we analyzed the geometrical aspects of these filters, leaving aside all concerns of biocompatibility and thrombogenicity, as well as the hemodynamic or clinical aspects. The goal was to determine an ideal geometrical model, with optimal filtration of clots and low risk of tilting.