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US5304378A
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Wound dressing material
Assignee: Niigata Hi-Spinners Ltd
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Filing: 1991-07-26
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Granted: 1994-04-19
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Expires: 2011-07-26
Abstract
Abstract A novel wound dressing material is produced by a chemical treatment of animal fibers, particularly, wool, to strip off the keratin layers of the surfaces of the fibers so as to expose the non-keratin protein in the underlayers, which is hydrophilic. The wound dressing material provides healing and regenerating effects on the wounds, and can be produced at a low cost.
Inventors
- 👤 Joichi Koga
- 👤 Koichi Nomura
- 👤 Hiroshi Hojo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:10
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
115 words
A wound dressing material made of animal-fibered fabric, wherein keratin layers of the surfaces of the animal fibers are stripped off through a chemical treatment to expose the non-keratin protein in the underlayers, whereby the surfaces of the animal fibers are modified to be hydrophilic, wherein said chemical treatment comprises (i) placing said animal fibers in an aqueous solution comprising water and an electrophilic reagent, (ii) applying a mechanical strain consisting essentially of rapid bending and stretching to said animal fibers which is effective to selectively swell non-keratin protein located beneath the surfaces of said animal fibers. (iii) applying an oxidizing agent to said animal fibers in an amount effective to remove said keratin layers.
Claim 2
Dependent Claim
115 words
A wound dressing material made of animal-fibered fabric, wherein keratin layers of the surfaces of the animal fibers are stripped off through a chemical treatment to expose the non-keratin protein in the underlayers, whereby the surfaces of the animal fibers are modified to be hydrophilic, wherein said chemical treatment comprises (i) placing said animal fibers in an aqueous solution comprising water and an electrophilic reagent, (ii) applying a mechanical strain consisting essentially of rapid bending and stretching to said animal fibers which is effective to selectively swell non-keratin protein located beneath the surfaces of said animal fibers. (iii) applying an oxidizing agent to said animal fibers in an amount effective to remove said keratin layers.
Claim 3
Dependent Claim
18 words
The wound dressing material of claim 1, wherein wool is used as the animal fibers of the fabric.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-18 | 1997-10-18 | 1998-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-18 | 2001-10-18 | 2002-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-18 | 2005-10-18 | 2006-04-19 | $7700.00 | Window Closed / Lapsed |