ePTFE lamination—resizing ePTFE tubing
View Patent ↗A vascular graft includes a vessel structure having outer and inner wall surfaces. The vessel structure has outer and inner transverse dimensions. The vascular graft includes a fold structure which is integral with the vessel structure. The fold structure extends from the outer or inner wall surface of the vessel structure for altering the inner or outer transverse dimension thereof. A method for making the vascular graft facilitates formation of the fold structure.
1. A vascular graft having a lumen therethrough, the graft comprising:
a vessel structure having a first layer of material disposed about the circumference of the vessel structure, a second layer of material disposed about the circumference of the vessel structure,
a stent structure within the vessel structure,
the vessel structure including a plurality of pleat structures including a first pleat structure, a second pleat structure, and a third pleat structure, the first and third pleat structure formed of one of the first or second layers of material and the second pleat structure formed of the other layer of material,
the first, second, and third pleat structures each being in the form of a first turn-back of said same layer of material followed by a second opposing turn-back of said same layer of material,
the first layer of material, second layer of material, and stent structure being secured to one another such that relative displacement between the stent structure and the first layer of material and second layer of material is obstructed,
wherein the first and third pleat structures are circumferentially offset from one another, and
wherein the first, second, and third pleat structures are each oriented helically relative to the longitudinal axis of the vascular graft; the first and third pleat structures having an opposite rotational orientation as compared with the second pleat structure.
2. A vascular graft according to claim 1 , wherein said vascular graft further comprises a suture material, said first and second pleat structures being sutured to said first or second layer of material.
3. A vascular graft according to claim 1 , wherein the vessel structure is free of pleat structures circumferentially between the first and third pleat.
4. A vascular graft according to claim 1 , and further comprising a radio-opaque marker within said first or second pleat structures and secured thereto.
5. A vascular graft according to claim 1 , and further comprising a radio-opaque marker positioned between said first or second pleat structures and said first or second layer of material, said radio-opaque marker being secured to said first or second pleat structure or said first or second layer of material.
6. A vascular graft according to claim 1 , wherein said vessel and first and second pleat structures comprise a PTFE material which is expanded.
7. A vascular graft according to claim 1 , wherein said stent structure has a transverse aperture into which said first layer of material or second layer of material extends for merging of said first layer of material and said second layer of material to one another to provide said securing of said first layer of material and said second layer of material and stent structure to one another.
8. A vascular graft according to claim 1 further comprising a radio-opaque marker within the first, second, and third pleat structures and secured thereto.
9. A vascular graft according to claim 1 further comprising a fourth pleat structure formed of the second layer of material, the fourth pleat structure being circumferentially offset from the second pleat structure, the fourth pleat structure being in the form of a first turn-back of the same layer of material followed by a second opposing turn-back of the same layer of material.
10. A vascular graft according to claim 1 wherein the first layer of material and the second layer of material include fillers selected from the group consisting of metals, carbon fibers, glass fibers, and ceramics.