Intravascular deliverable stent for reinforcement of abdominal aortic aneurysm
First Claim
1. A catheter deliverable stent for treating an abdominal aortic aneurysm comprising:
- a continuous innermost tubular structure having a first length and comprising a first plurality of braided strands forming a first braid comprising a first shape memory alloy, the first braid of the continuous innermost tubular structure having a predetermined pick and pitch to define openings sufficiently large so as to not materially impede blood flow therethrough, the first braid extending from a first end of the innermost tubular structure to a second end of the innermost tubular structure;
a continuous outer tubular structure having a second length less than the first length and comprising a second plurality of braided strands forming a second braid comprising a second shape memory alloy, the second braid of the continuous outer tubular structure having a predetermined pick and pitch to define openings sufficiently small so as to substantially preclude blood flow therethrough, the continuous outer tubular structure being in a coaxial relationship with and surrounding the continuous innermost tubular structure, wherein the continuous innermost tubular structure and the continuous outer tubular structure are both adapted to self expand and together form a composite tubular structure having a predetermined diameter;
wherein a longitudinal stretching of the composite tubular structure reduces the outer diameter of the composite tubular structure sufficiently to allow the composite tubular structure to be loaded into a lumen of an intravascular delivery catheter, and wherein release of the composite tubular structure from the intravascular delivery catheter allows the composite tubular structure to self expand back to said predetermined diameter.
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Accused Products
Abstract
A stent/graft especially designed to be used in a minimally invasive surgical procedure for treating an abdominal aortic aneurysm (AAA) comprises an innermost tubular structure of a length (L1) formed by braiding a relatively few strands of shape memory alloy wire. The pick and pitch of the braid are such as to provide relative large fenestrations in the tubular wall. A portion of the innermost tubular structure of a length L2<L1 is surrounded by a further braided tubular structure having relatively many strands that occlude the fenestrations of the innermost tubular structure. The composite structure can be stretched to reduce the outer diameter of the stent/graft, allowing it to be drawn into a lumen of a delivery catheter. The catheter can then be advanced through the vascular system to the site of the AAA and then ejected, allowing it to self-expand with the portion L2 bridging the aneurysm. The portion L1>L2 does not block blood flow to the renal arteries while the portion L2 prevents the aneurysm to grown and burst.
88 Citations
12 Claims
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1. A catheter deliverable stent for treating an abdominal aortic aneurysm comprising:
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a continuous innermost tubular structure having a first length and comprising a first plurality of braided strands forming a first braid comprising a first shape memory alloy, the first braid of the continuous innermost tubular structure having a predetermined pick and pitch to define openings sufficiently large so as to not materially impede blood flow therethrough, the first braid extending from a first end of the innermost tubular structure to a second end of the innermost tubular structure; a continuous outer tubular structure having a second length less than the first length and comprising a second plurality of braided strands forming a second braid comprising a second shape memory alloy, the second braid of the continuous outer tubular structure having a predetermined pick and pitch to define openings sufficiently small so as to substantially preclude blood flow therethrough, the continuous outer tubular structure being in a coaxial relationship with and surrounding the continuous innermost tubular structure, wherein the continuous innermost tubular structure and the continuous outer tubular structure are both adapted to self expand and together form a composite tubular structure having a predetermined diameter; wherein a longitudinal stretching of the composite tubular structure reduces the outer diameter of the composite tubular structure sufficiently to allow the composite tubular structure to be loaded into a lumen of an intravascular delivery catheter, and wherein release of the composite tubular structure from the intravascular delivery catheter allows the composite tubular structure to self expand back to said predetermined diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A catheter deliverable stent for treating an abdominal aortic aneurysm comprising:
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an innermost tubular structure having a first length, first and second ends and comprised of a first plurality of braided strands of a shape memory alloy, wherein the innermost tubular structure has a predetermined pick and pitch extending from the first to the second end and defining openings across the entire first length having an area sufficiently large so as to not materially impede blood flow therethrough; an outer tubular structure having a second length shorter than the first length, first and second ends, and comprised of a second plurality of braided strands of a shape memory alloy, wherein the outer tubular structure has a predetermined pick and pitch to define openings having an area sufficiently small so as to substantially preclude blood flow therethrough; the innermost tubular structure and the outer tubular structure each having a preset expanded diameter and being self expandable from a compressed diameter to the preset expanded diameter, the innermost tubular structure surrounded by and coaxial with the outer tubular structure to form a composite tubular structure; and wherein a longitudinal stretching of the composite tubular structure reduces the outer diameter of the composite tubular structure sufficiently to allow the structure to be loaded into a lumen of an intravascular delivery catheter, and wherein release of the composite tubular structure from the catheter allows the structure to self expand back to said predetermined diameter.
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Specification