US4803078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressing
Assignee: Japan Gore Tex Inc
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Filing: 1988-03-28
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Granted: 1989-02-07
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Expires: 2008-03-28
Abstract
Abstract A wound dressing is provided comprising a layer of chitin affixed to a layer of porous, expanded polytetrafluoroethylene (PTFE). The chitin may be laminated to the PTFE or it may penetrate into and be impregnated in the porous PTFE layer. The composite preferably has a pressure sensitive adhesive applied in a dot pattern on its surface to enable application and securing of the dressing over a wound.
Inventors
- 👤 Mari Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:55
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61F; A61F13/00; A61F13/02; A61F13/023; A61L15/28; A61F2013/00089; A61F2013/00217; A61F2013/00221; A61F2013/00361; A61F2013/00727; A61F2013/00748; A61F2013/00855; A61F2013/00863
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
16 words
A wound dressing comprising a layer of chitin affixed to a layer of porous, expanded polytetrafluoroethylene.
Claim 2
Dependent Claim
16 words
A wound dressing comprising a layer of chitin affixed to a layer of porous, expanded polytetrafluoroethylene.
Claim 3
Dependent Claim
13 words
The dressing of claim 1 wherein the chitin is laminated to the polytetrafluoroethylene.
Claim 4
Dependent Claim
18 words
The dressing of claim 1 wherein the chitin penetrates into and is impregnated in the porous polytetrafluoroethylene layer.
Claim 5
Dependent Claim
30 words
The dressing of claim 1 having a pressure sensitive adhesive applied in a dot pattern on its surface, thereby providing means to apply and secure said dressing over a wound.
Claim 6
Dependent Claim
29 words
The dressing of claim 1 wherein said porous, expanded polytetrafluoroethylene has a microstructure of nodes interconnected by fibrils wherein fibril lengths range from about 0.01 to about 1.0 micrometers.
Claim 7
Dependent Claim
23 words
The dressing of claim 1 wherein a layer of a water-absorbing macromolecular material is interposed between said chitin layer and said polytetrafluoroethylene layer.
Claim 8
Dependent Claim
12 words
The dressing of claim 6 wherein said water-absorbing macromolecular material is polyvinylalcohol.
Claim 9
Dependent Claim
16 words
the dressing of claim 6 wherein said water-absorbing macromolecular material is an acrylic acid graft-polymerized starch.
References Cited (Backward Citations)
US4373519A
Cited
US4664105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |