US4034751A
Expired / Lapsed
US
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Polymeric sheets as synthetic medical dressings or coverings for wounds
Assignee: International Paper Co
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Filing: 1975-11-24
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Granted: 1977-07-12
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Expires: 1995-11-24
Abstract
Abstract Polymeric sheets having on one or both sides a fabric texture and a network of elongated channels in the interior of the structural framework of the sheet. In one embodiment, the sheets comprise a plurality of interbonded continuous polymeric ribs extending in a direction parallel to the plane of the sheet. The ribs impart a fabric texture to both sides of the sheet and define between them recessed portions on each surface of the sheet. The elongated channels extend throughout the ribs. The open area between the ribs can vary from zero to 60%. In another embodiment, the sheets have an ultra-thin, pinhole-free silicone rubber membrane on one side and a fabric texture on the other side. The sheets are useful as burn coverings where they serve as synthetic temporary replacements for damaged or missing skin. The sheets have physiologic properties similar to human skin, excellent drapability characteristics, recessed portions which provide a reservoir for wound debris and, in certain embodiments, a dermal surface which permits wound adherence by fibroblastic ingrowth.
Inventors
- 👤 John Hui-hsiung Hung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:58
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/01; A61F13/01008; A61F13/01017; A61F13/01034; A61F13/01046; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61F13/15; A61F13/53; A61F13/534; A61F2013/00089; A61F2013/00119; A61F2013/00157; A61F2013/00182; A61F2013/00246; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00727; A61F2013/00731; A61F2013/00744; A61F2013/00846; A61F2013/00855; A61F2013/00876; A61F2013/00902; A61F2013/0091; A61F2013/53445; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24744; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2935
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
A synthetic medical dressing or covering for wounds comprising an integral, continuous, non-woven, non-fibrous, non-filamentary, non-foamed, drapable polymeric sheet at least one side of which has a fabric texture and comprises a plurality of interbonded continuous polymeric ribs defining between them recessed portions in said at least one side of the sheet, said ribs containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within said ribs which extend continuously throughout said at least one side of the sheet, said sheet having a water vapor phase transfer rate of about 2 to 20 mg./hr.-cm. 2 , two dimensional elongation of at least about 100% in each direction, and an open area between the ribs of zero to about 60%.
Claim 2
Dependent Claim
138 words
A synthetic medical dressing or covering for wounds comprising an integral, continuous, non-woven, non-fibrous, non-filamentary, non-foamed, drapable polymeric sheet at least one side of which has a fabric texture and comprises a plurality of interbonded continuous polymeric ribs defining between them recessed portions in said at least one side of the sheet, said ribs containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within said ribs which extend continuously throughout said at least one side of the sheet, said sheet having a water vapor phase transfer rate of about 2 to 20 mg./hr.-cm. 2 , two dimensional elongation of at least about 100% in each direction, and an open area between the ribs of zero to about 60%.
Claim 3
Dependent Claim
38 words
The synthetic medical dressing or covering of claim 1 further including exteriorly located elongated continuous channels in the surface of said at least one side of the sheet which extend substantially parallel to the plane of the sheet.
Claim 4
Dependent Claim
54 words
The synthetic medical dressing or covering of claim 1 wherein one side of said sheet is a pinhole-free silicone rubber membrane layer whose thickness is less than about 2 mils, and wherein said sheet has anti-microbial barrier layer properties and a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm. 2 .
Claim 5
Dependent Claim
13 words
The synthetic medical dressing or covering of claim 1 formed of silicone rubber.
Claim 6
Dependent Claim
32 words
The synthetic medical dressing or covering of claim 1 having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm. 2 and an open area of about 10 to 50%.
Claim 7
Dependent Claim
32 words
The synthetic medical dressing or covering of claim 4 having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm. 2 and an open area of about 10 to 50%.
Claim 8
Dependent Claim
129 words
A synthetic medical dressing or covering for wounds comprising an integral, continuous, non-laminated, non-woven, non-fibrous, non-filamentary, non-foamed, drapable polymeric sheet each side of which has a fabric texture, said sheet comprising a plurality of interbonded continuous polymeric ribs defining between them recessed portions on each side of said sheet, said ribs containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within said ribs which extend continuously throughout said ribs, said sheet having a water vapor phase transfer rate of about 2 to 20 mg./hr.-cm. 2 , two dimensional elongation of at least about 100% in each direction and an open area between the ribs of zero to about 60%.
Claim 9
Dependent Claim
129 words
A synthetic medical dressing or covering for wounds comprising an integral, continuous, non-laminated, non-woven, non-fibrous, non-filamentary, non-foamed, drapable polymeric sheet each side of which has a fabric texture, said sheet comprising a plurality of interbonded continuous polymeric ribs defining between them recessed portions on each side of said sheet, said ribs containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within said ribs which extend continuously throughout said ribs, said sheet having a water vapor phase transfer rate of about 2 to 20 mg./hr.-cm. 2 , two dimensional elongation of at least about 100% in each direction and an open area between the ribs of zero to about 60%.
Claim 10
Dependent Claim
39 words
The synthetic medical dressing or covering of claim 7 wherein the elongated continuous channels are of filamentary configuration and have a length to diameter ratio of at least about 100 and a diameter of about 0.1 to 5 mils.
Claim 11
Dependent Claim
41 words
The synthetic medical dressing or covering of claim 7 formed entirely from silicone rubber, and having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm. 2 and an open area between the ribs of about 10 to 50%.
Claim 12
Dependent Claim
140 words
A synthetic medical dressing or covering for wounds comprising a drapable sheet having a fabric texture on one surface thereof comprising an integral, unified, non-laminated continuous sheet of polymeric material having on one side thereof a thin membrane layer whose thickness does not exceed about 2 mils and on the other side thereof a fabric texture formed by portions of said polymeric material which project from said membrane layer and form a continuous phase with said membrane layer, said portions of said polymeric material which project containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within the sheet, said sheet having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm. 2 , and anti-microbial barrier layer properties.
Claim 13
Dependent Claim
140 words
A synthetic medical dressing or covering for wounds comprising a drapable sheet having a fabric texture on one surface thereof comprising an integral, unified, non-laminated continuous sheet of polymeric material having on one side thereof a thin membrane layer whose thickness does not exceed about 2 mils and on the other side thereof a fabric texture formed by portions of said polymeric material which project from said membrane layer and form a continuous phase with said membrane layer, said portions of said polymeric material which project containing a plurality of elongated continuous channels interiorly located therein which extend in a direction generally parallel to the plane of the sheet to form a network of voids within the sheet, said sheet having a water vapor phase transfer rate of about 2 to 10 mg./hr.-cm. 2 , and anti-microbial barrier layer properties.
Claim 14
Dependent Claim
16 words
The synthetic medical dressing or covering of claim 10 wherein said polymeric material is silicone rubber.
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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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |