| 摘要 |
A bifurcated stent graft (18, 92, 122, 130, 144) implantable in branched int ernal passageways includes an open-frame stent latticework (34, 94, 126, 146) form ed of helically wound structural strands(36), and a graft sleeve(40, 110, 124, 132, 150, 152 )formed of interwoven textile strands (60). The sleeve is substantially impervious to f luids and is adjustable along with the graft between a nominal state and radially-reduced axially-elongated state, according to substantially the same relationship of radial reduction versus axial elongation. The sleeve and stent are bonded to one another at least at proximal and distal end regions of the stent graft. The sleeve preferably is surrounded b y the stent, and incorporates a flow dividing feature in the form of an axially extending sea m (56, 112, 114, 134, 136). The seam brings together portions of the sleeve that otherwise wo uld be circumferentially spaced apart in the tubular sleeve shape. The stent lattic ework and graft sleeve can be coextensive, the sleeve can extend distally beyond the lattice work, or the latticework can extend proximally beyond the sleeve, depending on the intend ed use. In other alternative embodiments, the sleeve can surround the latticework.
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