Methods for making encapsulated stent-grafts
First Claim
1. A method for making an encapsulated stent-graft, the stent-graft comprising a self-expanding stent having an essentially tubular configuration with a central longitudinal lumen and having a first diameter and a second diameter, wherein the first diameter is larger than the second diameter, comprising the steps of:
- placing a first tube of biocompatible material over a mandrel;
manipulating said stent from said first diameter to said second diameter;
concentrically engaging said stent about said first tube at said second diameter;
positioning an interlayer member about said stent;
concentrically engaging a second tube of biocompatible material about said interlayer member, said stent and said first tube, forming a stent-graft assembly;
applying pressure to said assembly by winding a layer of tape over said second tube to compress said assembly against said mandrel; and
heating said assembly, wherein said first tube is joined to said second tube through openings in the wall of said stent, forming a monolithic layer of biocompatible material that applies a constraining force on said stent, preventing said stent from expanding to said first diameter, the monolithic layer of biocompatible material being radially deformable to release said constraining force on said stent.
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Abstract
A method for making an encapsulated stent-graft having an essentially tubular configuration with a central longitudinal lumen and having a first diameter and a second diameter, wherein the first diameter is larger than the second diameter. The stent-graft may include a self-expanding stent and a first and second tube of biocompatible material between which the stent is positioned. The stent-graft may also include an interlayer member between the first and second tube. The method generally includes applying pressure and heat to a stent-graft assembly to form a monolithic layer of biocompatible material around the stent.
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Citations
31 Claims
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1. A method for making an encapsulated stent-graft, the stent-graft comprising a self-expanding stent having an essentially tubular configuration with a central longitudinal lumen and having a first diameter and a second diameter, wherein the first diameter is larger than the second diameter, comprising the steps of:
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placing a first tube of biocompatible material over a mandrel;
manipulating said stent from said first diameter to said second diameter;
concentrically engaging said stent about said first tube at said second diameter;
positioning an interlayer member about said stent;
concentrically engaging a second tube of biocompatible material about said interlayer member, said stent and said first tube, forming a stent-graft assembly;
applying pressure to said assembly by winding a layer of tape over said second tube to compress said assembly against said mandrel; and
heating said assembly, wherein said first tube is joined to said second tube through openings in the wall of said stent, forming a monolithic layer of biocompatible material that applies a constraining force on said stent, preventing said stent from expanding to said first diameter, the monolithic layer of biocompatible material being radially deformable to release said constraining force on said stent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for making an encapsulated stent-graft, the stent-graft comprising a self-expanding stent having an essentially tubular configuration with a central longitudinal lumen and having a first diameter and a second diameter, wherein the first diameter is larger than the second diameter, comprising the steps of:
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placing a first tube of biocompatible material over a mandrel;
concentrically engaging said stent about said first tube at said first diameter;
positioning an interlayer member about said stent;
concentrically engaging a second tube of biocompatible material about said interlayer member, said stent and said first tube, forming a stent-graft assembly;
applying pressure to said assembly by winding a layer of tape over said second tube to compress said assembly against said mandrel;
heating said assembly, wherein said first tube is joined to said second tube through openings in the wall of said stent, forming a monolithic layer of biocompatible material; and
manipulating said assembly to said second diameter, wherein a constraining force in the form of a delivery sheath is applied to said assembly, preventing said assembly from expanding to said first diameter. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29)
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30. A method for making an encapsulated stent-graft, the stent-graft comprising a self-expanding stent having an essentially tubular configuration with a central longitudinal lumen and having a first diameter and a second diameter, wherein the first diameter is larger than the second diameter, comprising the steps of:
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placing a first tube of biocompatible material over a mandrel;
positioning an interlayer member about said first tube;
manipulating said stent from said first diameter to said second diameter;
concentrically engaging said stent about said first tube and said interlayer member at said second diameter;
concentrically engaging a second tube of biocompatible material about said stent, said interlayer member and said first tube, forming a stent-graft assembly;
applying pressure to said assembly by winding a layer of tape over said second tube to compress said assembly against said mandrel; and
heating said assembly, wherein said first tube is joined to said second tube through openings in the wall of said stent, forming a monolithic layer of biocompatible material that applies a constraining force on said stent, preventing said stent from expanding to said first diameter, the monolithic layer of biocompatible material being radially deformable to release said constraining force on said stent.
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31. A method for making an encapsulated stent-graft, the stent-graft comprising a self-expanding stent having an essentially tubular configuration with a central longitudinal lumen and having a first diameter and a second diameter, wherein the first diameter is larger than the second diameter, comprising the steps of:
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placing a first tube of biocompatible material over a mandrel;
positioning an interlayer member about said first tube;
concentrically engaging said stent about said first tube at said first diameter;
concentrically engaging a second tube of biocompatible material about said stent, said interlayer member and said first tube, forming a stent-graft assembly;
applying pressure to said assembly by winding a layer of tape over said second tube to compress said assembly against said mandrel;
heating said assembly, wherein said first tube is joined to said second tube through openings in the wall of said stent, forming a monolithic layer of biocompatible material; and
manipulating said assembly to said second diameter, wherein a constraining force in the form of a delivery sheath is applied to said assembly, preventing said assembly from expanding to said first diameter.
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Specification