Prosthesis having an everting pivoting fenestration
View Patent ↗The present disclosure relates to an endoluminal prosthesis, such as a stent graft that includes one or more fenestrations to accommodate endovascular disease, such as an aneurysm in cases where one or more side branches is involved. In one aspect, the prosthesis includes fenestrations that are pivotable to accommodate the dynamic geometry of the aortic branches. In another aspect, the pivotable fenestrations include a first perimeter, a band of flexible material attached and surrounding the first perimeter, a second perimeter attached to and surrounding the band of flexible material and a support frame disposed about a surface of the band of flexible material. The first perimeter, band of flexible material, and second perimeter have a geometric shape. The support frame includes a plurality of support units having curved segments. The curved segments of the support units may be concave with respect to an exterior surface of the prosthesis.
1. An endoluminal prosthesis, comprising:
a graft having a tubular body and a surface comprising a first biocompatible material;
one or more stents attached about the surface of the graft;
one or more fenestrations disposed through a sidewall of the graft, each fenestration having a diameter;
at least one fenestration having a first perimeter having a first diameter and surrounding the fenestration;
the first perimeter having a band of flexible material attached to and surrounding the first perimeter, the band of flexible material having a depth relative to a surface plane of the tubular body; and
the band of flexible material having a second perimeter surrounding the band of flexible material; and
a support frame attached to and positioned on an outer surface of the band of flexible material and extending between the first perimeter and the second perimeter, the support frame having a monostable structure comprising a flange and one or more support units having curved, concave segments with respect to an exterior surface of the graft and a circular reinforcement member, the one or more support units surrounding the at least one fenestration;
where the first perimeter, the band of flexible material, and the second perimeter have a geometric shape, the geometric shape extending radially outward from a surface of prosthesis and having an everting configuration, and where each fenestration is pivotable in a direction away from an axis perpendicular to a longitudinal axis of the prosthesis.
2. The prosthesis of claim 1 , where the support frame comprises at least three support units.
3. The prosthesis of claim 1 , where the curved segments of the one or more support units are interconnected by a plurality of apices.
4. The prosthesis of claim 1 , wherein the curved segments curve radially outward and away from a longitudinal axis of the prosthesis.
5. The prosthesis of claim 1 , where the support units of the support frame are comprised of a single continuous wire.
6. The prosthesis of claim 1 , wherein the geometric shape is generally frustoconical.
7. The prosthesis of claim 1 , wherein at least one stent is positioned in an out-of-phase configuration, the stents comprising a plurality of struts interconnected by apices.
8. The prosthesis of claim 7 , wherein the first perimeter, the band of flexible material, and the second perimeter are at least partially demarcated by a pair of struts on the stent having an out-of-phase configuration.