Patent US4857069A successfully refreshed from Google Patents.
US4857069A
Expired / Lapsed
US
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Artificial vessel and process for preparing the same
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1988-02-29
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Granted: 1989-08-15
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Expires: 2008-02-29
Abstract
Abstract An artificial vessel having a compliance and a stress-strain curve approximate to those of a vital vessel, which comprises a porous part of an elastomer having pores which communicate between the inside of the vessel and the outside of the vessel and a tubular part of fibers, said tubular part being in contact with and/or bonded to at least one part of the porous part. The artificial vessel can be prevented from breakage and damage at a high blood pressure and has an excellent durability.
Inventors
- 👤 Kazuaki Kira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:54
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/14; A61L27/18; A61F; A61F2/00; A61F2/02; A61F2/04; A61F2/06; A61F2/062; A61L27/50; A61L27/56; B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/09; B29K; B29K2021/00; B29K2105/00; B29K2105/0058; B29K2105/0073
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
An artificial vessel consisting essentially of first and second groups of concentric layers, said first group consisting essentially of porous fibrous material and comprising at least one concentric layer, said second group consisting essentially of porous segmented polyurethane elastomer and comprising at least one concentric layer, wherein the innermost layer of the artificial vessel is a layer of said porous segmented polyurethane elastomer, and wherein said groups have pores which communicate the inner surface of the vessel to the outer surface of the vessel, said vessel having a compliance and a stress-strain curve approximate to the compliance and the stress strain curve of a vital vessel.
Claim 2
Dependent Claim
106 words
An artificial vessel consisting essentially of first and second groups of concentric layers, said first group consisting essentially of porous fibrous material and comprising at least one concentric layer, said second group consisting essentially of porous segmented polyurethane elastomer and comprising at least one concentric layer, wherein the innermost layer of the artificial vessel is a layer of said porous segmented polyurethane elastomer, and wherein said groups have pores which communicate the inner surface of the vessel to the outer surface of the vessel, said vessel having a compliance and a stress-strain curve approximate to the compliance and the stress strain curve of a vital vessel.
Claim 3
Dependent Claim
13 words
The artificial vessel of claim 1, wherein the compliance is 0.1 to 0.8.
Claim 4
Dependent Claim
49 words
The artificial vessel of claim 1, wherein the strain is 0.1 to 0.8 at a stress of 0.01 kg/mm 2 , the strain is 0.4 to 1.2 at a stress of 0.05 kg/mm 2 and the strain is 0.5 to 1.5 at a stress of 0.12 kg/mm 2 .
Claim 5
Dependent Claim
13 words
The artificial vessel of claim 1, wherein the segmented polyurethane elastomer contains fluorine.
Claim 6
Dependent Claim
18 words
The artificial vessel of claim 1, wherein the segmented polyurethane elastomer contains a dimethylsiloxane in its main chain.
Claim 7
Dependent Claim
16 words
The artificial vessel of claim 1, wherein said fibrous layer is formed by a knit fabric.
Claim 8
Dependent Claim
19 words
The artificial vessel of claim 1, wherein said fibrous layer is formed by a knit fabric of stretch yarns.
Claim 9
Dependent Claim
141 words
An artificial vessel consisting essentially of first and second groups of concentric layers, said first group consisting essentially of porous fibrous material and comprising at least one concentric layer, said second group consisting essentially of porous segmented polyurethane elastomer and comprising at least one concentric layer, wherein the innermost layer of the artificial vessel is a layer of said porous segmented polyurethane elastomer, and wherein said groups have pores which communicate the inner surface of the vessel to the outer surface of the vessel, said vessel having a compliance of 0.1 to 0.8, and a stress-strain curve in which the strain is 0.1 to 0.8 at a stress of 0.01 kg/mm 2 , the strain is 0.4 to 1.2 at a stress of 0.05 kg/mm 2 and the strain is 0.5 to 1.5 at a stress of 0.12 kg/mm 2 .
Claim 10
Dependent Claim
141 words
An artificial vessel consisting essentially of first and second groups of concentric layers, said first group consisting essentially of porous fibrous material and comprising at least one concentric layer, said second group consisting essentially of porous segmented polyurethane elastomer and comprising at least one concentric layer, wherein the innermost layer of the artificial vessel is a layer of said porous segmented polyurethane elastomer, and wherein said groups have pores which communicate the inner surface of the vessel to the outer surface of the vessel, said vessel having a compliance of 0.1 to 0.8, and a stress-strain curve in which the strain is 0.1 to 0.8 at a stress of 0.01 kg/mm 2 , the strain is 0.4 to 1.2 at a stress of 0.05 kg/mm 2 and the strain is 0.5 to 1.5 at a stress of 0.12 kg/mm 2 .
Claim 11
Dependent Claim
16 words
The artificial vessel of claim 8, wherein said fibrous layer is formed by a knit fabric.
Claim 12
Dependent Claim
19 words
The artificial vessel of claim 8, wherein said fibrous layer is formed by a knit fabric of stretch yarns.
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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) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |