US4629459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternate stent covering for tissue valves
Assignee: Livanova Holding USA Inc
•
Filing: 1983-12-28
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Granted: 1986-12-16
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Expires: 2003-12-28
Abstract
Abstract A prosthetic heart valve comprising a stent having an annular base and a plurality of legs extending upwardly from said base; a valve element circumscribing said stent and attached thereto, said valving element comprising a number of cooperating valve leaflets equal to the number of said legs; and a layer of biologically-compatible material secured to said stent and positioned between said stent and said leaflets, said layer having a smooth, non-abrasive outer surface and covering all of the surfaces of said stent that, in the absence of said layer, would contact the mobile portions of said leaflets during the normal function of the valve.
Inventors
- 👤 Marian I. Ionescu
- 👤 Jay A. Lenker
- 👤 Philip S. Yang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2412; A61F2220/00; A61F2220/0025; A61F2220/0075; Y; Y10; Y10S; Y10S623/00; Y10S623/90
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
121 words
A prosthetic heart valve comprising: a stent having an annular base and a plurality of legs extending upwardly from said base; a valve element circumscribing said stent and attached thereto, said valving element comprising a number of cooperating valve leaflets equal to the number of said legs; and, for the purpose of avoiding abrasion damage caused by the rubbing of said leaflets over said stent, a layer of biologically-compatible material secured to said stent and positioned between said stent and said leaflets, said layer having a smooth, non-abrasive outer surface and covering all of the surfaces of said stent that, in the absence of said layer, would contact the mobile portions of said leaflets during the normal function of the valve.
Claim 2
Dependent Claim
121 words
A prosthetic heart valve comprising: a stent having an annular base and a plurality of legs extending upwardly from said base; a valve element circumscribing said stent and attached thereto, said valving element comprising a number of cooperating valve leaflets equal to the number of said legs; and, for the purpose of avoiding abrasion damage caused by the rubbing of said leaflets over said stent, a layer of biologically-compatible material secured to said stent and positioned between said stent and said leaflets, said layer having a smooth, non-abrasive outer surface and covering all of the surfaces of said stent that, in the absence of said layer, would contact the mobile portions of said leaflets during the normal function of the valve.
Claim 3
Dependent Claim
21 words
A prosthetic heart valve according to claim 1, wherein said layer is a sheet of a smooth surface synthetic polymeric material.
Claim 4
Dependent Claim
20 words
A prosthetic heart valve according to claim 2, wherein said synthetic polymeric material is polyurethane, a silicone elastomer or polytetrafluoroethylene.
Claim 5
Dependent Claim
17 words
A prosthetic heart valve according to claim 1, wherein said layer is a sheet of natural tissue.
Claim 6
Dependent Claim
15 words
A prosthetic heart valve according to claim 4, wherein said natural tissue is pericardial tissue.
Claim 7
Dependent Claim
14 words
A prosthetic heart valve according to claim 5, wherein the pericardial tissue is cross-linked.
Claim 8
Dependent Claim
30 words
A prosthetic heart valve according to claim 6, wherein the cross-linking of the pericardial tissue is achieved by fixation of the tissue before or after its attachment to the stent.
Claim 9
Dependent Claim
19 words
A prosthetic heart valve according to claim 1, wherein said layer is a smooth coating of synthetic polymeric material.
Claim 10
Dependent Claim
19 words
A prosthetic heart valve according to claim 8, wherein the synthetic polymeric material is polyurethane or a silicone elastomer.
Claim 11
Dependent Claim
35 words
A prosthetic heart valve according to claim 1 comprising additionally a layer of fabric covering the entire surface of and attached to said stent, and positioned between said stent and said layer of biologically-compatible material.
Claim 12
Dependent Claim
22 words
A prosthesis according to claim 10, wherein said layer of biologically-compatible material is a sheet of a smooth surface synthetic polymeric material.
Claim 13
Dependent Claim
18 words
A prosthesis according to claim 11, wherein said synthetic polymeric material is polyurethane, a silicone elastomer or polytetrafluoroethylene.
Claim 14
Dependent Claim
19 words
A prosthes is according to claim 10, wherein said layer of biologically-compatible material is a sheet of natural tissue.
Claim 15
Dependent Claim
13 words
A prosthesis according to claim 13, wherein said natural tissue is pericardial tissue.
Claim 16
Dependent Claim
12 words
A prosthesis according to claim 14, wherein the pericardial tissue is cross-linked.
Claim 17
Dependent Claim
26 words
A prosthesis according to claim 15, wherein the cross-linking is achieved by fixation of the tissue before or after its attachment to the fabric covered stent.
Claim 18
Dependent Claim
25 words
A prosthesis according to claim 10, wherein said layer of biologically-compatible material is a smooth coating of polymeric material applied to said layer of fabric.
Claim 19
Dependent Claim
16 words
A prosthesis according to claim 17, wherein said polymeric material is a silicone elastomer or polyurethane.
Claim 20
Dependent Claim
21 words
A prosthesis according to claim 10 wherein the biologically-compatible material is attached to the fabric by means of a biologically-compatible glue.
Claim 21
Dependent Claim
18 words
A prosthesis according to claim 10 wherein the biologically-compatible material is attached to the fabric by means of-sutures.
Claim 22
Dependent Claim
22 words
A prosthesis according to claim 10, wherein said layer of biologically-compatible material is a coating of organic material applied to the fabric.
Claim 23
Dependent Claim
20 words
A prosthesis according to claim 21, wherein the organic material is cross-linked collagen, uncross-linked collagen, cross-linked gelatin or uncross-linked gelatin.
Claim 24
Dependent Claim
23 words
A prosthesis according to claim 1, wherein the biologically-compatible material has a greater compliance than the material from which the stent is made.
Claim 25
Dependent Claim
72 words
A stent for use in a prosthetic heart valve, which comprises an annular base, a plurality of legs extending upwardly from said base and a layer of biologically-compatible material secured to and covering all the surfaces thereof, the said layer having a smooth, non-abrasive outer surface, the said outer-surface being that which contacts the mobile portions of the leaflets in the heart valve for which the stent is adapted to be used.
Claim 26
Dependent Claim
72 words
A stent for use in a prosthetic heart valve, which comprises an annular base, a plurality of legs extending upwardly from said base and a layer of biologically-compatible material secured to and covering all the surfaces thereof, the said layer having a smooth, non-abrasive outer surface, the said outer-surface being that which contacts the mobile portions of the leaflets in the heart valve for which the stent is adapted to be used.
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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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |