US3896802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible flocked dressing
Assignee: Wyeth Holdings LLC
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Filing: 1974-04-19
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Granted: 1975-07-29
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Expires: 1994-04-19
Abstract
Abstract A wound surface is protected by a wound dressing consisting of a moisture permeable elastomeric film whose moisture permeability is in the order of that of the intact human skin to which is adhesively flocked a layer of tissue compatible and tissue absorbable fibers, such as polyglycolic acid. All tissue contacting material is absorbable by living tissue so that any material which is trapped within the wound is absorbable.
Inventors
- 👤 Bernard Leo Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:40
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/64; A61F; A61F13/00; A61F13/01; A61F13/01034; A61F13/01038; A61F13/01046; A61L15/22; A61L15/26; A61F2013/00089; A61F2013/00157; A61F2013/00246; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00544; A61F2013/00553; A61F2013/00561; A61F2013/00727; A61F2013/00855; A61F2013/00876; A61F2013/00902; A61F2013/0091; A61F13/15; A61F13/51; A61F13/511; A61F2013/51186; A61F13/513; A61F2013/51355; A61F13/514; A61F13/51401; A61F2013/51409; A61F2013/51411; A61F13/53; A61F2013/530992
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
139 words
A wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to moisture of the order of that of the intact human skin (approximately 2.2 mg/sq. cm./hr.) which comprises: an elastomeric layer which elastomeric layer has adhesively flocked to its surface a layer of fibers and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days.
Claim 2
Dependent Claim
139 words
A wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to moisture of the order of that of the intact human skin (approximately 2.2 mg/sq. cm./hr.) which comprises: an elastomeric layer which elastomeric layer has adhesively flocked to its surface a layer of fibers and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days.
Claim 3
Dependent Claim
174 words
A wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to moisture of the order of that of the intact human skin (approximately 2.2 mg/sq. cm./hr.), which comprises: an elastomeric layer of the order of 2 mils thick, and which elastomeric layer has adhesively flocked to its surface a layer of fibers of the order of 1 to 12 denier, and about 10 to 30 mils long, and which are predominantly at about right angles to the elastomeric layer, and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days.
Claim 4
Dependent Claim
174 words
A wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to moisture of the order of that of the intact human skin (approximately 2.2 mg/sq. cm./hr.), which comprises: an elastomeric layer of the order of 2 mils thick, and which elastomeric layer has adhesively flocked to its surface a layer of fibers of the order of 1 to 12 denier, and about 10 to 30 mils long, and which are predominantly at about right angles to the elastomeric layer, and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days.
Claim 5
Dependent Claim
32 words
The wound dressing of claim 2 in which the tissue compatible material is a polymer subject to hydrolytic degradation to non-toxic, tissue compatible absorbable components, said polymer having glycolic acid ester linkages.
Claim 6
Dependent Claim
16 words
The wound dressing of claim 3 in which the tissue compatible material is homopolymeric polyglycolic acid.
Claim 7
Dependent Claim
18 words
The wound dressing of claim 3 in which the tissue compatible material is a polymer of 3-methyl-1,4 dioxane-2,5-dione.
Claim 8
Dependent Claim
17 words
The wound dressing of claim 2 in which the tissue compatible material is a polymer of N-acetyl-D-glucosamine.
Claim 9
Dependent Claim
153 words
A sterile wound dressing package comprising an interiorly sterile strippable laminate container having therein a wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to moisture of the order of that of the intact human skin (approximately 2.2 mg/sq. cm./hr.) which comprises: an elastomeric layer which elastomeric layer has adhesively flocked to its surface a layer of fibers and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days.
Claim 10
Dependent Claim
153 words
A sterile wound dressing package comprising an interiorly sterile strippable laminate container having therein a wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to moisture of the order of that of the intact human skin (approximately 2.2 mg/sq. cm./hr.) which comprises: an elastomeric layer which elastomeric layer has adhesively flocked to its surface a layer of fibers and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days.
Claim 11
Independent Claim
236 words
A method for protecting the surface of living tissue during a healing process which comprises: during a preliminary period, covering and protecting the surface of damaged tissue by emplacing thereon a wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to mositure of the order of that of the intact human skin (Approximately 2.2 mg/sq. cm./hr.), which comprises: an elastomeric layer of the order of 2 mils thick, and which elastomeric layer has adhesively flocked to its surface a layer of fibers of the order of 1 to 12 denier, and about 10 to 30 mils long, and which are predominantly at about right angles to the elastomeric layer, and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days, permitting granulation tissue to regenerate thereunder to give a clean wound closed by said dressing, stripping off said dressing to expose granulation tissue, then autografting living skin to said exposed granulation tissue.
Claim 12
Independent Claim
236 words
A method for protecting the surface of living tissue during a healing process which comprises: during a preliminary period, covering and protecting the surface of damaged tissue by emplacing thereon a wound dressing for the surface of living tissue from which at least part of the skin has been removed and which tissue is subject to moisture loss, and bacterial contamination, which dressing is sufficiently flexible that it will conform and adapt to the surface of the tissue to minimize pools of fluid or air between the dressing and the tissue surface, which pools generate problems of infection, and which has a permeability to mositure of the order of that of the intact human skin (Approximately 2.2 mg/sq. cm./hr.), which comprises: an elastomeric layer of the order of 2 mils thick, and which elastomeric layer has adhesively flocked to its surface a layer of fibers of the order of 1 to 12 denier, and about 10 to 30 mils long, and which are predominantly at about right angles to the elastomeric layer, and which fibers are of a tissue compatible material which is substantially absorbed by living tissue within about 90 days, and which fibers maintain their integrity for at least about 3 days, permitting granulation tissue to regenerate thereunder to give a clean wound closed by said dressing, stripping off said dressing to expose granulation tissue, then autografting living skin to said exposed granulation tissue.
Claim 13
Dependent Claim
15 words
The process of claim 8 in which the tissue compatible material is homopolymeric polyglycolic acid.
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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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |