EP0150608A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Stent covering for tissue valves
Assignee: Livanova Holding USA Inc
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Filing: 1984-12-19
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Granted: —
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Expires: 2004-12-19
Abstract
Abstract A prosthetic heart valve comprising a stent (12) having an annular base (19) and a plurality of legs (15, 16, 17) extending upwardly from said base; a valve element circumscribing said stent and attached thereto, said valve element comprising a number of cooperating valve leaflets (11) equal to the number of said legs; and a layer (21) 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 Ian Ionescu
- 👤 Jay Alan Lenker
- 👤 Philip Shu-Cuan Yang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-22 19:27
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: 12
Claim 1
Independent Claim
115 words
A prosthetic heart valve comprising a stent (12) having an annular base (19) and a plurality of legs (15, 16, 17) extending upwardly from said base and a valve element circumscribing said stent and attached thereto, said valve element comprising a number of cooperating valve leaflets (11) equal to the number of said legs, characterized in that a layer (21) of biologically-compatible material is 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
115 words
A prosthetic heart valve comprising a stent (12) having an annular base (19) and a plurality of legs (15, 16, 17) extending upwardly from said base and a valve element circumscribing said stent and attached thereto, said valve element comprising a number of cooperating valve leaflets (11) equal to the number of said legs, characterized in that a layer (21) of biologically-compatible material is 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
34 words
A prosthetic heart valve according to claim 1, characterized in that said layer (21) is a sheet of a synthetic polymeric material, a coating of synthetic polymeric material or a sheet of natural tissue.
Claim 4
Dependent Claim
22 words
A prosthetic heart valve according to claim 2, characterized in that said synthetic polymeric material is polyurethane, a silicone elastomer or polytetrafluoroethylene.
Claim 5
Dependent Claim
34 words
A prosthetic heart valve according to claim 2, characterized in that said natural tissue is pericardial tissue which is cross-linked by fixation of the tissue before or after its attachment to the stent (12).
Claim 6
Dependent Claim
44 words
A prosthetic heart valve according to any one of the preceding claims, characterized in that it comprises additionally a layer of fabric (21) covering the entire surface of and attached to said stent, and positioned between said stent and said layer of biologically-compatible material.
Claim 7
Dependent Claim
31 words
A prosthetic heart valve according to claim 5, characterized in that the biologically-compatible material (22) is attached to the fabric by means of a biologically-compatible glue or by means of sutures.
Claim 8
Dependent Claim
27 words
A prosthetic heart valve according to claim 5, characterized in that said layer of biologically-compatible material is a coating of organic material applied to the fabric (21).
Claim 9
Dependent Claim
24 words
A prosthetic heart valve according to claim 7, characterized in that the organic material is collagen or gelatin which may be uncross-linked or cross-linked.
Claim 10
Dependent Claim
31 words
A prosthetic heart valve according to any one of the preceding claims, characterized in that the biologically-compatible material has a greater compliance than the material from which the stent is made.
Claim 11
Dependent Claim
81 words
A stent (12) for use in a prosthetic heart valve.comprising an annular base (19) and a plurality of legs (15, 16, 17) extending upwardly from said base, characterized in that a layer of biologically-compatible material (21) is secured to and covers 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 12
Dependent Claim
81 words
A stent (12) for use in a prosthetic heart valve.comprising an annular base (19) and a plurality of legs (15, 16, 17) extending upwardly from said base, characterized in that a layer of biologically-compatible material (21) is secured to and covers 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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