US4191218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrics for heart valve and vascular prostheses and methods of fabricating same
Assignee: Albany International Corp
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Filing: 1978-04-28
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Granted: 1980-03-04
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Expires: 1998-04-28
Abstract
Abstract Prostheses for inadequate or diseased heart valves and blood vessels, formed of fabrics comprising multifilament synthetic yarns. For a heart valve the fabric is supported on a three-lobed frame. During manufacture, the fabric is subjected to a plural step compressive shrinking and crimping process to impart nonisotropic elastic compliance approximating the natural mechanical properties. The resulting composite structures are free of thrombogenic complications.
Inventors
- 👤 Richard E. Clark
- 👤 John Skelton
- 👤 Robert B. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:25
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F2/24; A61F2/2412; D; D03; D03D; D03D15/00; D03D15/20; D03D15/283; D03D15/40; D03D15/44; D03D15/46; D03D3/00; D03D3/02; D03D7/00; D10; D10B; D10B2331/00; D10B2331/04; D10B2401/00; D10B2401/06; D10B2401/061; D10B2509/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
93 words
A fabric for a cardiovascular prosthesis comprising woven multifilament polymeric yarns extending in first and second directions forming an angle therebetween, the yarns in each of said directions having crimps similarly oriented with respect to the plane of the fabric and being bloomed in their interstices to form a substantial number of open interstitial spaces in the range of 20 to 40 microns evenly distributed throughout the fabric, the stretch characteristic of the fabric having a region of easy elongation up to at least ten percent in at least one of said directions.
Claim 2
Dependent Claim
93 words
A fabric for a cardiovascular prosthesis comprising woven multifilament polymeric yarns extending in first and second directions forming an angle therebetween, the yarns in each of said directions having crimps similarly oriented with respect to the plane of the fabric and being bloomed in their interstices to form a substantial number of open interstitial spaces in the range of 20 to 40 microns evenly distributed throughout the fabric, the stretch characteristic of the fabric having a region of easy elongation up to at least ten percent in at least one of said directions.
Claim 3
Dependent Claim
20 words
A fabric according to claim 1, in which the fabric has different elastic compliance in said first and second directions.
Claim 4
Dependent Claim
15 words
A fabric according to claim 1, in which the yarns are flattened and essentially untwisted.
Claim 5
Dependent Claim
14 words
A fabric according to claim 1, in which said angle is a right angle.
Claim 6
Dependent Claim
18 words
A fabric according to claim 1 in the form of a ribbon having a selvage of uncut yarns.
Claim 7
Dependent Claim
12 words
A fabric according to claim 1 in the form of a tube.
Claim 8
Dependent Claim
18 words
A fabric according to claim 6, in which the longitudinal elastic compliance differs from the circumferential elastic compliance.
Claim 9
Dependent Claim
15 words
A fabric according to claim 1, in which the filament diameters are about 10 microns.
Claim 10
Dependent Claim
21 words
A fabric according to claim 1, of tubular form and having a circumferential extension ratio of at least 1.5 to one.
Claim 11
Dependent Claim
15 words
A fabric according to claim 3, having a thickness less than about four filament diameters.
Claim 12
Dependent Claim
101 words
A fabric for a cardiovascular prosthesis comprising a flat braided ribbon having a selvage of uncut multifilament polymeric yarns extending in first and second directions forming an angle therebetween, the yarns in each of said directions having crimps similarly oriented with respect to the plane of the fabric and being bloomed in their interstices to form a substantial number of open interstitial spaces in the range of 20 to 40 microns evenly distributed throughout the fabric, the stretch characteristic of the fabric having a region of easy elongation up to at least ten percent in at least one of said directions.
Claim 13
Dependent Claim
101 words
A fabric for a cardiovascular prosthesis comprising a flat braided ribbon having a selvage of uncut multifilament polymeric yarns extending in first and second directions forming an angle therebetween, the yarns in each of said directions having crimps similarly oriented with respect to the plane of the fabric and being bloomed in their interstices to form a substantial number of open interstitial spaces in the range of 20 to 40 microns evenly distributed throughout the fabric, the stretch characteristic of the fabric having a region of easy elongation up to at least ten percent in at least one of said directions.
Claim 14
Dependent Claim
26 words
A fabric according to claim 11, having longitudinal yarns extending parallel to the selvage and braid carrier yarns extending to the selvage at acute angles thereto.
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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) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |