US5061276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layered poly(tetrafluoroethylene)/elastomer materials useful for in vivo implantation
Assignee: Edwards Lifesciences Corp
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Filing: 1988-12-19
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Granted: 1991-10-29
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Expires: 2008-12-19
Abstract
Abstract A vascular graft having a composite structure prepared by wrapping about the external surface of a tube having one or more layers of polytetrafluoroethylene or a polytetrafluoroethylene-elastomeric polymer blend, either alone or in combination, an elastic fiber, while maintaining the fiber under tension. The elastic fibers can be wound about the entire length of the tube while being maintained under the same of different degrees of tension. Furthermore, the elastic fibers may be wound about the tube under a higher degree of tension along locations adjacent the opposite ends the tubing.
Inventors
- 👤 Roger Tu
- 👤 Edwin Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:31
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/50; A61L27/507; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61L27/14; A61L27/16; A61L27/26; B; B29; B29C; B29C55/00; B29C55/005; A61F2/0077; A61F2250/00; A61F2250/0014; A61F2250/0023; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A vascular graft comprising a porous polytetrafluoroethylene tubing and elastic fibers wrapped about the external surface of said tubing, with said fibers being wrapped about said surface at varying angles and under varying degrees of applied tension to promote the retraction of said tubing from the original size of said polytetrafluoroethylene tubing without said wrapping of fibers, and wherein said elastic fibers are wrapped under higher degrees of tension at locations adjacent to said tubing opposite ends.
Claim 2
Dependent Claim
77 words
A vascular graft comprising a porous polytetrafluoroethylene tubing and elastic fibers wrapped about the external surface of said tubing, with said fibers being wrapped about said surface at varying angles and under varying degrees of applied tension to promote the retraction of said tubing from the original size of said polytetrafluoroethylene tubing without said wrapping of fibers, and wherein said elastic fibers are wrapped under higher degrees of tension at locations adjacent to said tubing opposite ends.
Claim 3
Dependent Claim
23 words
The vascular graft of claim 1 wherein said tubing is retracted from about one to about fifty percent of said tubing original size.
Claim 4
Dependent Claim
23 words
The vascular graft of claim 1 wherein said tubing is retracted from about five to about thirty percent of said tubing original size.
Claim 5
Dependent Claim
19 words
The vascular graft of claim 2 wherein said desired winding angle is from about thirty to about eight degrees.
Claim 6
Dependent Claim
19 words
The vascular graft of claim 3 wherein said desired winding angle is from about thirty to about eighty degrees.
Claim 7
Dependent Claim
43 words
A vascular graft comprising a porous polytetrafluoroethylene tubing and elastic fibers wrapped under varying degrees of tension about the external surface of said tubing, with said elastic fibers being wrapped under higher degrees of tension at locations adjacent to said tubing opposite ends.
Claim 8
Dependent Claim
43 words
A vascular graft comprising a porous polytetrafluoroethylene tubing and elastic fibers wrapped under varying degrees of tension about the external surface of said tubing, with said elastic fibers being wrapped under higher degrees of tension at locations adjacent to said tubing opposite ends.
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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) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |