PTFE vascular graft and method of manufacture
First Claim
Patent Images
1. An ePTFE self-sealing graft comprising:
- a first ePTFE tubular structure having a first porosity;
a second ePTFE tubular structure having a second porosity less than said first porosity, said second ePTFE tubular structure being disposed externally about said first ePTFE tubular structure; and
a resealable polymer layer interposed between said first and second ePTFE tubular structures.
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Abstract
An implantable microporous ePTFE tubular vascular graft exhibits long term patency, superior radial tensile strength and suture hole elongation resistance. The graft includes a first ePTFE tube and a second ePTFE tube circumferentially disposed over the first tube. The first ePTFE tube exhibits a porosity sufficient to promote cell endothelization, tissue ingrowth and healing. The second ePTFE tube exhibits enhanced radial strength in excess of the radial tensile strength of the first tube.
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Citations
27 Claims
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1. An ePTFE self-sealing graft comprising:
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a first ePTFE tubular structure having a first porosity;
a second ePTFE tubular structure having a second porosity less than said first porosity, said second ePTFE tubular structure being disposed externally about said first ePTFE tubular structure; and
a resealable polymer layer interposed between said first and second ePTFE tubular structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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16. A method of forming a tubular vascular prosthesis comprising the steps of:
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providing a first PTFE tubular structure having a given porosity sufficient to promote cell endothelization and a given strength;
providing a second PTFE tubular structure having a radial strength greater than the radial strength of said first PTFE tubular structure;
disposing an intermediate resealable polymer layer over said first PTFE tubular structure; and
disposing said second PTFE tubular structure over said intermediate layer to define a composite structure.
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27. An ePTFE self-sealing graft comprising:
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a first ePTFE tubular structure;
a second ePTFE tubular structure disposed externally about said first ePTFE tubular structure; and
a self-sustained resealable polymer layer interposed between said first and second ePTFE tubular structures.
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Specification