US5607590A
Expired / Lapsed
US
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Material for medical use and process for preparing same
Assignee: Amniotec Inc
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Filing: 1994-08-05
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Granted: 1997-03-04
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Expires: 2014-08-05
Abstract
Abstract There are disclosed a material for medical use comprising two sheets of collagen membrane adhered to each other with an adhesive and having interposed therebetween a mesh-like intermediary material, wherein the mean pore size of the mesh-like intermediary material is between 100 and 2000 μm; and a process for preparing a material for medical use comprising (a) laminating with an adhesive two sheets of a collagen membrane having a mesh-like intermediary material interposed therebetween; (b) maintaining the resulting laminated material under a reduced pressure so that the two sheets of collagen membrane are adhered to each other through the mesh-like intermediary; and (c) cross-linking the laminated material.
Inventors
- 👤 Yasuhiko Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:36
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/40; A61L27/44; A61L27/48; A61L15/00; A61L15/16; A61L15/22; A61L15/32; A61L15/325; A61L31/00; A61L31/12; A61L31/125; A61L31/129
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
50 words
A material for medical use comprising two sheets of membrane of a purified collagen derived from a living body adhered to each other with an adhesive and having interposed therebetween a mesh-like intermediary material, wherein the mean pore size of the mesh-like intermediary material, is between 100 and 2000 μm.
Claim 2
Dependent Claim
50 words
A material for medical use comprising two sheets of membrane of a purified collagen derived from a living body adhered to each other with an adhesive and having interposed therebetween a mesh-like intermediary material, wherein the mean pore size of the mesh-like intermediary material, is between 100 and 2000 μm.
Claim 3
Dependent Claim
31 words
The material of claim 1, wherein the membrane of a purified collagen derived from a living body is a collagen solubilized with an alkali or a collagen solubilized with an enzyme.
Claim 4
Dependent Claim
26 words
The material of claim 1, wherein the membrane of a purified collagen derived from a living body is of a human amnion or a human chorion.
Claim 5
Dependent Claim
34 words
The material of claim 3, wherein the mesh-like intermediary material is interposed with two sheets of the collagen membrane of a human amnion so that the surfaces thereof facing toward a fetus are outside.
Claim 6
Dependent Claim
34 words
The material of claim 3, wherein the mesh-like intermediary material is interposed with two sheets of the collagen membrane of a human amnion so that the surfaces thereof facing toward a chorion are outside.
Claim 7
Dependent Claim
20 words
The material of claim 1, wherein the mean pore size of the mesh-like intermediary material is 100 to 1500 μm.
Claim 8
Dependent Claim
18 words
The material of claim 1, wherein the mesh-like intermediary material is degradable and absorbable in a living body.
Claim 9
Dependent Claim
20 words
The material of claim 1, wherein the mesh-like intermediary material is not degradable and not absorbable in a living body.
Claim 10
Dependent Claim
45 words
The material of claim 7, wherein the intermediary material is a poly(glycolic acid), a poly(lactic acid), a copolymer of glycolic acid and lactic acid, a polydioxanone, a copolymer of glycolic acid and trimethylene carbonate or a mixture of a poly(glycolic acid) and a poly(lactic acid).
Claim 11
Dependent Claim
39 words
The material of claim 8, wherein the intermediary material is neither degradable nor absorbable in a living body and is a silicone, a polytetrafluoroethylene, a polyethylene, a polypropylene, a polyethylene terephthalate, a polyurethane, a polyvinyl alcohol or a nylon.
Claim 12
Dependent Claim
16 words
The material of claim 1, wherein the adhesive is a collagen solution or a gelatin solution.
Claim 13
Dependent Claim
67 words
A process for preparing a material for medical use comprising: (a) laminating with an adhesive two sheets of membrane of a purified collagen derived from a living body having a mesh-like intermediary material interposed therebetween; (b) maintaining the resulting laminated material under a reduced pressure so that the two sheets of membrane are adhered to each other through the mesh-like intermediary; and (c) cross-linking the laminated material.
Claim 14
Dependent Claim
67 words
A process for preparing a material for medical use comprising: (a) laminating with an adhesive two sheets of membrane of a purified collagen derived from a living body having a mesh-like intermediary material interposed therebetween; (b) maintaining the resulting laminated material under a reduced pressure so that the two sheets of membrane are adhered to each other through the mesh-like intermediary; and (c) cross-linking the laminated material.
Claim 15
Dependent Claim
14 words
The process of claim 12, wherein the material is subjected further to succinylation treatment.
Claim 16
Dependent Claim
31 words
The process of claim 12, wherein the membrane of a purified collagen derived from a living body is a collagen solubilized with an alkali or a collagen solubilized with an enzyme.
Claim 17
Dependent Claim
26 words
The process of claim 12, wherein the membrane of a purified collagen derived from a living body is of a human amnion or a human chorion.
Claim 18
Dependent Claim
34 words
The process of claim 15, wherein the mesh-like intermediary material is interposed with two sheets of the collagen membrane of a human amnion so that the surfaces therof facing toward a fetus are outside.
Claim 19
Dependent Claim
34 words
The process of claim 15, wherein the mesh-like intermediary material is interposed with two sheets of the collagen membrane of a human amnion so that the surfaces thereof facing toward a chorion are outside.
Claim 20
Dependent Claim
20 words
The process of claim 12, wherein the mean pore size of the mesh-like intermediary material is 100 to 2000 μm.
Claim 21
Dependent Claim
18 words
The process of claim 12, wherein the mesh-like intermediary material is degradable and absorbable in a living body.
Claim 22
Dependent Claim
20 words
The process of claim 12, wherein the mesh-like intermediary material is not degradable and not absorbable in a living body.
Claim 23
Dependent Claim
45 words
The process of claim 19, wherein the intermediary material is a poly(glycolic acid), a poly(lactic acid), a copolymer of glycolic acid and lactic acid, a polydioxanone, a copolymer of glycolic acid and trimethylene carbonate or a mixture of a poly(glycolic acid) and a poly(lactic acid).
Claim 24
Dependent Claim
29 words
The process of claim 20, wherein the intermediary material is a silicone, a polytetrafluoroethylene, a polyethylene, a polypropylene, a polyethylene terephthalate, a polyurethane, a polyvinyl alcohol or a nylon.
Claim 25
Dependent Claim
16 words
The process of claim 12, wherein the adhesive is a collagen solution or a gelatin solution.
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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) | 2000-03-03 | 2000-09-02 | 2001-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-03 | 2004-09-02 | 2005-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-03 | 2008-09-02 | 2009-03-04 | $7700.00 | Window Closed / Lapsed |