Patent US4911164A successfully refreshed from Google Patents.
US5282847A
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US
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Prosthetic vascular grafts with a pleated structure
Assignee: Medtronic Inc
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Filing: 1992-07-15
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Granted: 1994-02-01
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Expires: 2012-07-15
Abstract
Abstract A vascular graft having a pleated circumference accommodates blood pressure changes with minimal change in internal surface area. A highly compliant graft may be made from a wide variety of polymers including non-elastomeric materials.
Inventors
- 👤 Paul V. Trescony
- 👤 Michael Wolf
- 👤 Richard L. Molacek
- 👤 Elaine Lindell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:28
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F2/07; A61L; A61L27/00; A61L27/14; A61L27/50; A61L27/507; A61F2210/00; A61F2210/0076; A61F2230/00; A61F2230/0002; A61F2230/0028; A61F2230/005; A61M; A61M25/00; A61M25/0043
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A vascular graft comprising: (a) a tubular wall structure having a thickness; (b) longitudinally extending pleats on the tubular wall structure, the pleats comprised of a biocompatible polymer capable of responding flexurally to changes in blood pressure by providing the tubular wall structure with a first cross sectional area when maintained at a low normal physiological blood pressure, and a second, greater cross sectional area when maintained at a high normal physiological blood pressure, while maintaining a constant interior wall perimeter for the tubular wall structure and wherein a portion of the pleats are corrugated in the longitudinal direction of the tubular wall structure and wherein two of said corrugated pleats are separated by a cluster of at least three uncorrugated pleats.
Claim 2
Dependent Claim
122 words
A vascular graft comprising: (a) a tubular wall structure having a thickness; (b) longitudinally extending pleats on the tubular wall structure, the pleats comprised of a biocompatible polymer capable of responding flexurally to changes in blood pressure by providing the tubular wall structure with a first cross sectional area when maintained at a low normal physiological blood pressure, and a second, greater cross sectional area when maintained at a high normal physiological blood pressure, while maintaining a constant interior wall perimeter for the tubular wall structure and wherein a portion of the pleats are corrugated in the longitudinal direction of the tubular wall structure and wherein two of said corrugated pleats are separated by a cluster of at least three uncorrugated pleats.
Claim 3
Dependent Claim
16 words
A vascular graft according to claim 1 wherein the wall structure has at least 8 pleats.
Claim 4
Dependent Claim
38 words
A vascular graft according to claim 1 wherein the tubular wall structure is made from a biocompatible polymer selected from the group consisting of silicone polymers, polytetrafluoroethylene, polyesters, polystyrene, polyurethanes, styrene-olefin copolymers, styrene block copolymers, polyethylene, and polypropylene.
Claim 5
Dependent Claim
16 words
A vascular graft according to claim 1 wherein the wall thickness is at most 0.007 inch.
Claim 6
Dependent Claim
21 words
A vascular graft according to claim 1 wherein the pleats are twisted about the longitudinal axis of the tubular wall structure.
Claim 7
Dependent Claim
18 words
A vascular graft according to claim 1 wherein the polymer flexural modulus is lower than its tensile modulus.
References Cited (Backward Citations)
US3479670A
Cited
US3986828A
Cited
US4140126A
Cited
US4300244A
Cited
WO1983003349A1
Cited
US4834746A
Cited
US4647416A
Cited
US4550447A
Cited
GB2187463A
Cited
US4770664A
Cited
US4759757A
Cited
US4605406A
Cited
GB2199327A
Cited
US4629458A
Cited
EP0256748A2
Cited
US4941870A
Cited
US4892539A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-31 | 1997-08-02 | 1998-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-31 | 2001-08-02 | 2002-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-31 | 2005-08-02 | 2006-02-01 | $7700.00 | Window Closed / Lapsed |