Patent US5800512A successfully refreshed from Google Patents.
US5800512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
PTFE vascular graft
Assignee: Boston Scientific Scimed Inc
•
Filing: 1996-01-22
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Granted: 1998-09-01
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Expires: 2016-01-22
Abstract
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.
Inventors
- 👤 David J. Lentz
- 👤 Jamie Henderson
- 👤 Edward J. Dormier
- 👤 Richard J. Zdrahala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:35
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/56; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61L27/14; A61L27/16; A61L27/507; A61F2/0077; A61F2002/0086; A61F2/07; A61F2002/072; Y; Y10; Y10S; Y10S623/00; Y10S623/901
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
99 words
An implantable tubular prosthesis comprising: an expanded polytetrafluoroethylene (ePTFE) composite tubular structure including a clearly defined tissue contacting expanded outer tube and concentrically adjacent separately expanded inner tube, an inner surface of which is a blood contacting surface; said outer and inner tubes each having a given porosity defined by node and fibril spacing of said expanded structure, said given porosity of said inner tube being different from said given porosity of said outer tube and wherein a distinct difference in porosity between said inner tube and said outer tube is defined on either side of an interface therebetween.
Claim 2
Dependent Claim
99 words
An implantable tubular prosthesis comprising: an expanded polytetrafluoroethylene (ePTFE) composite tubular structure including a clearly defined tissue contacting expanded outer tube and concentrically adjacent separately expanded inner tube, an inner surface of which is a blood contacting surface; said outer and inner tubes each having a given porosity defined by node and fibril spacing of said expanded structure, said given porosity of said inner tube being different from said given porosity of said outer tube and wherein a distinct difference in porosity between said inner tube and said outer tube is defined on either side of an interface therebetween.
Claim 3
Dependent Claim
25 words
An implantable tubular prosthesis of claim 1 wherein said outer tube exhibits a radial strength in excess of the radial strength of said inner portion.
Claim 4
Dependent Claim
25 words
An implantable tubular prosthesis of claim 1 wherein said given porosity of said inner tube is greater than said given porosity of said outer tube.
Claim 5
Dependent Claim
75 words
An implantable polytetrafluoroethylene (PTFE) tubular vascular prosthesis comprising: a first PTFE tubular structure having been expanded to provide a given radial strength; and a second PTFE tubular structure circumferentially disposed externally about said first expanded PTFE tubular structure; said first expanded PTFE tubular structure exhibiting a porosity sufficient to promote cell endothelization therealong and said second PTFE tubular structure exhibiting radial strength in excess of the radial strength of said first expanded PTFE tubular structure.
Claim 6
Dependent Claim
75 words
An implantable polytetrafluoroethylene (PTFE) tubular vascular prosthesis comprising: a first PTFE tubular structure having been expanded to provide a given radial strength; and a second PTFE tubular structure circumferentially disposed externally about said first expanded PTFE tubular structure; said first expanded PTFE tubular structure exhibiting a porosity sufficient to promote cell endothelization therealong and said second PTFE tubular structure exhibiting radial strength in excess of the radial strength of said first expanded PTFE tubular structure.
Claim 7
Dependent Claim
21 words
A vascular prosthesis of claim 4 wherein said second PTFE tubular structure is adheringly supported over said first PTFE tubular structure.
Claim 8
Dependent Claim
27 words
A vascular prosthesis of claim 4 further including an additional structure formed over one of said first PTFE tubular structure and over said second PTFE tubular structure.
Claim 9
Dependent Claim
24 words
A vascular prosthesis of claim 6 wherein said additional structure is interposed between said first PTFE tubular structure and said second PTFE tubular structure.
Claim 10
Dependent Claim
25 words
A vascular prosthesis of claim 7 wherein said additional structure exhibits a porosity which is less than said porosity of said first PTFE tubular structure.
Claim 11
Dependent Claim
16 words
A vascular prosthesis of claim 7 wherein said additional structure is formed of a polymer composition.
Claim 12
Dependent Claim
12 words
A vascular prosthesis of claim 9 wherein said polymer composition is PTFE.
Claim 13
Dependent Claim
16 words
A vascular prosthesis of claim 4 wherein said second PTFE structure is formed of expanded PTFE.
Claim 14
Dependent Claim
22 words
A vascular prosthesis of claim 10 wherein said first PTFE structure has a porosity greater than that of said second PTFE structure.
Claim 15
Dependent Claim
25 words
A vascular prosthesis of claim 12 wherein said additional structure exhibits a strength which is greater than the radial strength of said first PTFE structure.
Claim 16
Dependent Claim
21 words
A vascular prosthesis of claim 13 wherein said additional structure exhibits strength less than said strength of said second PTFE structure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-31 | 2002-03-02 | 2002-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-31 | 2006-03-02 | 2006-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-31 | 2010-03-02 | 2010-09-01 | $7700.00 | Window Closed / Lapsed |