US Patent 7837726 Visible endoprosthesis

A crack-resistant endoprosthesis for delivery in a body lumen can be comprised of a multilayered material. The multilayered material can include at least two layers having a boundary layer therebetween. The boundary layer is configured to inhibit cracks from propagating from a first layer-to a second layer. The different layers can be comprised of the same materials or different materials. It can be preferred that the multilayered material have layers that are comprised of resiliently-flexible materials, shape memory materials, and/or radiopaque materials.