Patent ID: 8795350

Claim:
A fenestrated venous stent graft system comprising: an expandable stent frame having a proximal end portion, a distal end portion, and a central portion between the proximal and distal end portions; and a lumen extending through the proximal end portion, the central portion, and the distal end portion; wherein the stent frame is radially expandable from a collapsed configuration to an expanded configuration; wherein the central portion is coupled to a fabric that extends along a perimeter of the central portion and comprises an aperture having a cross-sectional dimension that is substantially equal to a cross-sectional dimension of an outer cross-sectional dimension of the distal portion; wherein the central portion comprises a curved, elongate member having a curved segment that extends around at least one-fourth of a perimeter of the aperture; wherein the segment has a radius of curvature that is less than 10 percent longer than a radius of curvature of the one-fourth of the perimeter of the aperture; wherein the elongate member provides a bias force that tends to resist collapse of the aperture when the stent frame is in the expanded configuration; wherein first and second portions of the elongate member, adjacent to opposite ends of the segment, respectively, each have a curvature with a different sign than the curvature of the segment.