US4957795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent elastomeric wound dressing
Assignee: 3M Co
•
Filing: 1990-01-24
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Granted: 1990-09-18
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Expires: 2010-01-24
Abstract
Abstract An elastomeric nonwoven absorbent web is provided. The web comprises a nonwoven fibrous matrix of elastomeric melt-blown small diameter fibers and absorbent staple fibers or absorbent particulate material, wicking staple fibers, and bulking staple fibers dispersed throughout the matrix. This web is particularly useful in an absorbent elastomeric wound dressing. The wound dressing has a fluid permeable, compliant, low adherency wound contacting layer, an intermediate conformable, fluid-absorbent element, i.e., the elastomeric nonwoven absorbent web, and a soft, compliant cover layer.
Inventors
- 👤 John E. Riedel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:31
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61L15/24; D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; Y; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/237; Y10T428/239; Y10T428/249921; Y10T428/249953; Y10T428/249982; Y10T428/249986; Y10T428/29; Y10T428/2904; Y10T428/2905; Y10T428/2909; Y10T428/2913; Y10T428/2922; Y10T428/2927; Y10T442/00; Y10T442/60; Y10T442/601; Y10T442/602
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
67 words
An elastomeric nonwoven absorbent web comprising a nonwoven fibrous matrix of about 10 to 20 weight percent elastomeric melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix.
Claim 2
Dependent Claim
67 words
An elastomeric nonwoven absorbent web comprising a nonwoven fibrous matrix of about 10 to 20 weight percent elastomeric melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix.
Claim 3
Dependent Claim
46 words
The elastomeric nonwoven absorbent web of claim 1 wherein said elastomeric melt-blown small diameter fibers comprise polyurethane elastomeric materials, polyester elastomeric materials, polyamide elastomeric materials, A-B-A block copolymer materials where the A end groups are styrenic moieties and B is an elastomeric midblock, and combinations thereof.
Claim 4
Dependent Claim
18 words
The elastomeric nonwoven absorbent web of claim 1 wherein said elastomeric melt-blown small diameter fibers comprise polyurethane fibers.
Claim 5
Dependent Claim
23 words
The elastomeric nonwoven absorbent web of claim 1 wherein said absorbent staple fibers comprise fibers having an absorbency of at least about 1000%.
Claim 6
Dependent Claim
20 words
The elastomeric nonwoven absorbent web of claim 4 wherein said absorbent staple fibers comprise acrylonitrile fibers having a hydrophilic surface.
Claim 7
Dependent Claim
25 words
The elastomeric nonwoven absorbent web of claim 1 wherein said wicking staple fibers comprise cotton fibers, rayon fibers, wool fibers, silk fibers, or combinations thereof.
Claim 8
Dependent Claim
18 words
The elastomeric nonwoven absorbent web of claim 1 wherein said wicking staple fibers comprise rayon or cotton fibers.
Claim 9
Dependent Claim
27 words
The elastomeric nonwoven absorbent web of claim 1 wherein said crimped bulking staple fibers have an average crimp frequency of more than about one-half crimp per centimeter.
Claim 10
Dependent Claim
20 words
The elastomeric nonwoven absorbent web of claim 8 wherein said crimp frequency is at least about 2 crimps per centimeter.
Claim 11
Dependent Claim
24 words
The elastomeric nonwoven absorbent web of claim 1 wherein said bulking staple fiber has a flexural rigidity of 1.5×10 -4 gram-square centimeters per tex.
Claim 12
Dependent Claim
18 words
The elastomeric nonwoven absorbent web of claim 1 wherein said bulking staple fiber is acrylic or polyester fiber.
Claim 13
Dependent Claim
20 words
The elastomeric nonwoven absorbent web of claim 1 wherein said web has a softness of less than about 80 g.
Claim 14
Dependent Claim
22 words
The elastomeric nonwoven absorbent web of claim 1 wherein said web has a wicking value of at least about 0.5 cm/30 sec.
Claim 15
Dependent Claim
20 words
The elastomeric nonwoven absorbent web of claim 1 wherein said web has an absorbency of at least about 1000 percent.
Claim 16
Dependent Claim
23 words
The elastomeric nonwoven absorbent web of claim 1 wherein said web has an absorbency of at least 11.5 g per g basis weight.
Claim 17
Dependent Claim
23 words
The elastomeric nonwoven absorbent web of claim 1 wherein said web has a retention of absorbed liquid of at least about 50 percent.
Claim 18
Dependent Claim
92 words
An absorbent elastomeric wound dressing comprising (1) a fluid permeable, compliant, low adherency wound contacting layer, (2) an intermediate conformable, fluid-absorbent element, the element having a nonwoven fibrous matrix of about 10 to °weight percent elastomeric melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix, and (3) a soft, compliant cover layer.
Claim 19
Dependent Claim
92 words
An absorbent elastomeric wound dressing comprising (1) a fluid permeable, compliant, low adherency wound contacting layer, (2) an intermediate conformable, fluid-absorbent element, the element having a nonwoven fibrous matrix of about 10 to °weight percent elastomeric melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix, and (3) a soft, compliant cover layer.
Claim 20
Dependent Claim
17 words
The wound dressing of claim 17 wherein said wound contacting layer and said fluid-absorbent element are coextensive.
Claim 21
Dependent Claim
19 words
The wound dressing of claim 17 wherein said wound contacting layer is a porous nonwoven small diameter fiber web.
Claim 22
Dependent Claim
19 words
The wound dressing of claim 19 wherein said porous nonwoven small diameter fiber web comprises a thermoplastic elastomeric resin.
Claim 23
Dependent Claim
13 words
The wound dressing of claim 20 wherein said thermoplastic elastomeric resin is polyurethane.
Claim 24
Dependent Claim
18 words
The wound dressing of claim 17 wherein said cover layer is absorbent liquid impermeable and moisture vapor permeable.
Claim 25
Dependent Claim
17 words
The wound dressing of claim 22 wherein said cover layer comprises a nonwoven small diameter fiber web.
Claim 26
Dependent Claim
25 words
The wound dressing of claim 22 wherein one face of said cover layer comprises a pressure-sensitive adhesive layer for contact with said fluid absorbent element.
Claim 27
Dependent Claim
20 words
The wound dressing of claim 22 wherein said cover layer extends beyond said fluid-absorbent element and said wound contacting layer.
Claim 28
Dependent Claim
67 words
An elastomeric nonwoven absorbent web comprising a nonwoven fibrous matrix of about 10 to 20 weight percent polyurethane melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix.
Claim 29
Dependent Claim
67 words
An elastomeric nonwoven absorbent web comprising a nonwoven fibrous matrix of about 10 to 20 weight percent polyurethane melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix.
Claim 30
Dependent Claim
117 words
An elastomeric nonwoven absorbent web comprising a nonwoven fibrous matrix of about 10 to 20 weight percent polyurethane melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix, said web having a softness of less than about 80 g, a wicking value of at least about 0.5 cm/30 sec, and absorbency of at least about 1000 percent and at least 11.5 g per g basis weight, and a retention of absorbed liquid of at least about 50 percent.
Claim 31
Dependent Claim
117 words
An elastomeric nonwoven absorbent web comprising a nonwoven fibrous matrix of about 10 to 20 weight percent polyurethane melt-blown small diameter fibers and about 10 to 30 weight percent absorbent staple fibers or about 5 to 20 weight percent absorbent polymeric particulate material, about 30 to 60 weight percent wicking staple fibers, and about 10 to 30 weight percent crimped bulking staple fibers dispersed throughout the matrix, said web having a softness of less than about 80 g, a wicking value of at least about 0.5 cm/30 sec, and absorbency of at least about 1000 percent and at least 11.5 g per g basis weight, and a retention of absorbed liquid of at least about 50 percent.
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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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |