US4373519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite wound dressing
Assignee: 3M Co
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Filing: 1981-06-26
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Granted: 1983-02-15
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Expires: 2001-06-26
Abstract
Abstract A composite wound dressing, optionally having controlled permeability, is highly absorbent toward blood and exudate and comprises a polytetrafluoroethylene fibril matrix, hydrophilic absorptive particles enmeshed in the matrix, and, optionally, a partially occlusive film coated on one surface of the matrix.
Inventors
- 👤 Louis A. Errede
- 👤 James D. Stoesz
- 👤 George D. Winter, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:50
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; A61F; A61F13/00; A61F13/01; A61F13/01034; A61F13/01046; A61L15/22; A61L15/24; A61F13/06; A61F13/064; A61F13/069; A61F13/15; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00157; A61F2013/00217; A61F2013/00246; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00463; A61F2013/00472; A61F2013/00519; A61F2013/00855; A61F2013/00876; A61F2013/00902; A61F2013/0091; A61F2013/00927; A61F2013/00931; A61F13/53; A61F2013/530481; A61F2013/530489; A61F2013/530496; Y; Y10; Y10S; Y10S128/00; Y10S128/21
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
75 words
A composite wound-dressing which is a sheet material, comprising: (a) a polytetrafluoroethylene fibril matrix, (b) 0.5 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 0.5 grams of water per gram of dry particles, and (c) a partially occlusive film coated on one surface of said matrix, wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing.
Claim 2
Dependent Claim
75 words
A composite wound-dressing which is a sheet material, comprising: (a) a polytetrafluoroethylene fibril matrix, (b) 0.5 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 0.5 grams of water per gram of dry particles, and (c) a partially occlusive film coated on one surface of said matrix, wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing.
Claim 3
Dependent Claim
43 words
The composite wound-dressing according to claim 1 wherein said hydrophilic absorbent particles are alginic acid, polyacrylatecellulose graft copolymer, collagen, chitin, chitosan, dextran, clay, casein, zein, carboxymethyldextran, starch, hydroxyethyl starch, hydrolyzed polyacrylonitrile, starch-methacrylonitrile polymer, polyacrylamide, hydrolyzed polyacrylamide, cellulose, carboxymethylcellulose or derivatives or mixtures thereof.
Claim 4
Dependent Claim
19 words
The composite wound-dressing according to claim 1 wherein said hydrophilic absorptive particles are particles of a crosslinked dextran derivative.
Claim 5
Dependent Claim
18 words
The composite wound-dressing according to claim 1 wherein said hydrophilic absorptive particles are admixed with inert diluent particles.
Claim 6
Dependent Claim
24 words
The composite wound-dressing according to claim 4 wherein said inert diluent particles are selected from polyethylene, polypropylene, polystyrene, kaolin, talc, silica, bentonite, and vermiculite.
Claim 7
Dependent Claim
20 words
The composite wound-dressing according to claim 4 wherein said particles comprise 40-90% of the weight of the said composite wound-dressing.
Claim 8
Dependent Claim
22 words
The composite wound-dressing according to claim 4 wherein said particles comprise about 80 to 90% of the weight of said composite wound-dressing.
Claim 9
Dependent Claim
21 words
The composite wound-dressing according to claim 1 wherein said hydrophilic absorbent particles range in size from about 0.1 to 300 micrometers.
Claim 10
Dependent Claim
21 words
The composite wound-dressing according to claim 1 wherein said hydrophilic absorbent particles range in size from about 1.0 to 80 micrometers.
Claim 11
Dependent Claim
25 words
The composite wound-dressing according to claim 1 wherein said fibril matrix comprises fibrils having a thickness in the range of about 0.025 to 0.5 micrometers.
Claim 12
Dependent Claim
20 words
The composite wound-dressing according to claim 1 wherein said partially occlusive film is a polymer of silicone, urethane, or acrylate.
Claim 13
Dependent Claim
37 words
The composite wound-dressing according to claim 1 wherein the rate of transmission of moisture through said dressing is in the range of about 240 to 2400 g/m 2 /24 hrs, at 37° C. and 75% relative humidity.
Claim 14
Dependent Claim
21 words
The composite wound-dressing according to claim 1 wherein said dressing has a thickness in the range of 0.1 to 10 mm.
Claim 15
Dependent Claim
23 words
The composite wound-dressing according to claim 1 wherein said partially occlusive film has a thickness in the range of 2 to 200 micrometers.
Claim 16
Dependent Claim
21 words
The composite wound-dressing according to claim 1 further comprising medicaments selected from antibacterial agents, antifungal agents, hemostatic agents, and wound-healing agents.
Claim 17
Independent Claim
74 words
A method of treating a wound comprising applying to said wound a composite wound-dressing which is a sheet material comprising: (a) a polytetrafluoroethylene fibril matrix; and (b) 0.5 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 0.5 grams of water per gram of dry particles, wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing.
Claim 18
Independent Claim
74 words
A method of treating a wound comprising applying to said wound a composite wound-dressing which is a sheet material comprising: (a) a polytetrafluoroethylene fibril matrix; and (b) 0.5 to 10 parts of hydrophilic absorptive particles per part of PTFE by weight enmeshed in said matrix, the absorptive particles having absorptive capacity greater than 0.5 grams of water per gram of dry particles, wherein substantially all of said hydrophilic absorptive particles are unavailable for sloughing.
Claim 19
Dependent Claim
26 words
The method of treating a wound according to claim 16 wherein said wound-dressing further comprises a partially occlusive film coated on one surface of said matrix.
Claim 20
Dependent Claim
27 words
The method of treating a wound according to claim 16 wherein said wound-dressing further comprises medicaments selected from antibacterial agents, antifungal agents, hemostatic agents, and wound-healing agents.
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |