Implantable vascular device comprising a bioabsorbable frame
A multiple-sided valve for implantation within a body vessel comprising a frame comprising a bioabsorbable material is provided. The devices can be pushed from a delivery catheter into the lumen of a duct or vessel and may include one or more barbs for anchoring purposes. A full or partial covering of fabric or other flexible material, or a bioabsorbable material, including a collagen-based material such as small intestinal submucosa (SIS), may be attached to the frame to form an occlusion device, a graft, or an implantable, intraluminal valve such as for correcting incompetent veins in the lower legs and feet.
1. A stent graft comprising :
a frame having first, second, third and fourth struts, a plurality of bends interconnecting the struts to form a closed circumference having a central aperture therethrough, the frame having a proximal end and a distal end, and a covering having an outer edge attached along each of the struts and substantially covering the frame aperture by transversing the aperture from the frame inward to a central opening in the covering, the central opening centered on a mid longitudinal axis of the stent graft,
wherein the central aperture has a first diameter, the central opening has a second diameter, and the first diameter is larger than the second diameter;
wherein the frame includes a first set of opposite bends being diametrically opposed to one another at the proximal end and having a first fold line extending between the first set of opposite bends, and a second set of opposite bends being diametrically opposed to one another at the distal end and having a second fold line extending between the second set of opposite bends, the first fold line being oriented perpendicular to the second fold line, and wherein the covering has a first fold extending along the first fold line to the central opening and a second fold extending along the second fold line to the central opening; and
a tubular graft disposed within the central opening of the covering.
2. The stent graft of claim 1 , wherein the bends interconnecting the frame struts each comprise a coil.
3. The stent graft of claim 1 , wherein the frame is a first frame and the stent graft comprises a second frame having fifth, sixth, seventh and eighth struts, a second plurality of bends interconnecting the fifth, sixth, seventh, and eighth struts to form a second closed circumference having a second central aperture therethrough, the second frame having a second proximal end and a second distal end, and a second covering having an outer edge attached along each of the fifth, sixth, seventh, and eighth struts and substantially covering the second frame aperture by transversing the second aperture from the second frame inward to a second central opening in the second covering, the second central opening centered on a mid longitudinal axis of the stent graft, wherein the second frame is longitudinally spaced from the first frame, and the tubular graft is disposed within the first central opening of the covering of the first frame and within the second central opening of the second frame.
4. The stent graft of claim 3 , further comprising a bar having barbs at axial ends thereof, wherein the bar is attached to the first and second frames to further anchor the stent graft within a body vessel.
5. The stent graft of claim 1 , wherein each of the frame struts is substantially identical in length.
6. The stent graft of claim 1 , wherein each of the frame struts has a length of at least about 50% of a diameter of a body vessel in which said stent graft is to be implanted.
7. The stent graft of claim 1 , wherein the covering has an outer edge attached along each of the frame struts.
8. The stent graft of claim 1 , wherein each of the frame struts has an outward curvature to conform to a curvature of a body vessel wall.
9. The stent graft of claim 1 , wherein the tubular graft is securely positioned within the covering opening along the longitudinal axis and spaced apart from the frame.
10. The stent graft of claim 1 , wherein the tubular graft comprises an extracellular matrix material.
11. The stent graft of claim 10 , wherein the tubular graft comprises a material selected from the group consisting of : small intestine submucosa, pericardium, stomach submucosa, liver basement membrane, urinary bladder submucosa, tissue mucosa and dura mater.
12. The stent graft of claim 1 , wherein the frame comprises a material selected from the group consisting of: stainless steel and a nickel-titanium alloy.
13. A stent graft comprising:
a frame having first, second, third and fourth struts, a plurality of bends interconnecting the struts to form a closed circumference having a central aperture therethrough, the frame having a proximal end and a distal end, and a covering having an outer edge attached along each of the struts and substantially covering the frame aperture by transversing the aperture from the frame inward to a central opening in the covering, the central opening centered on a mid longitudinal axis of the stent graft,
wherein the central aperture has a first diameter, the central opening has a second diameter, and the first diameter is larger than the second diameter;
wherein the frame includes a first set of opposite bends diametrically opposed to one another at the proximal end and a second set of opposite bends diametrically opposed to one another at the distal end, and wherein the covering has oppositely facing folds extending diagonally between the opposite bends of each of the first and second sets to the central opening; and
a tubular graft disposed within the central opening of the covering.
14. A stent graft comprising :
a frame having first, second, third and fourth struts, a plurality of bends interconnecting the struts to form a closed circumference having a central aperture therethrough, the frame having a proximal end and a distal end, and a single covering having an outer edge attached along each of the struts and substantially covering the frame aperture by transversing the aperture from the frame inward to a central opening in the covering, the central opening centered on a mid longitudinal axis of the stent graft,
wherein the central aperture has a first diameter, the central opening has a second diameter, and the first diameter is larger than the second diameter;
wherein the frame includes a first set of opposite bends being diametrically opposed to one another at the proximal end and having a first fold line extending between the first set of opposite bends, and a second set of opposite bends being diametrically opposed to, one another at the distal end and having a second fold line extending between the second set of opposite bends, the first fold line being oriented perpendicular to the second fold line, and wherein the covering has a first fold extending along the first fold line to the central opening and a second fold extending along the second fold line to the central opening; and
a tubular graft disposed within the central opening of the covering.