Patent ID: 8257432

Claim:
A prosthesis for placement at an ostium opening from a main body lumen to a branch body lumen, the prosthesis comprising: a radially expansible support configured to be deployed in at least a portion of the branch body lumen or the main body lumen; and a plurality of fronds extending axially from an end of the support, the fronds being configured to be positioned across the ostium and (a) into the main body lumen in a direction opposite to blood flow when the radially expansible support is in the branch body lumen or (b) into the branch body lumen in a direction of blood flow when the radially expansible support is in the main body lumen; wherein the plurality of fronds have sufficient length to (1) extend into and bend and rotate and thereby expandably circumscribe at least partially the main vessel wall and reach the portion of the main vessel wall opposing the ostium when the support is implanted in the branch lumen, or (2) reach the portion of the branch vessel wall beyond the ostium when the support is implanted in the main lumen.