US4664662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wound dressing
Assignee: Smith and Nephew PLC
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Filing: 1985-07-31
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Granted: 1987-05-12
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Expires: 2005-07-31
Abstract
Abstract An absorbent, non-adherent wound dressing suitable for use in deep and cavernous wounds is described. The dressing comprises an absorbent material in the form of individual pieces of a conformable, resilient, absorbent hydrophilic foam retained within a porous bag formed from a perforated polymeric film. In a preferred form the foam is a hydrophilic polyurethane foam and the perforated polymeric film is a contoured net of a thermoplastic elastomeric polymer. A non-woven fabric may be additionally present between the perforated polymeric film and the pieces of foam. The dressings can absorb large volumes of wound exudate without adhering to the wound.
Inventors
- 👤 David F. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:21
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61F; A61F13/00; A61F13/00051; A61F13/00063; A61F13/01; A61F13/01021; A61L15/22; A61L15/225; A61L15/26; A61F13/06; A61F13/064; A61F13/069; A61F13/15; A61F13/53; A61F13/534; A61F13/537; A61F2013/00089; A61F2013/00119; A61F2013/00157; A61F2013/00217; A61F2013/00246; A61F2013/00251; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/0054; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00855; A61F2013/00859; A61F2013/00897; A61F2013/00902; A61F2013/00927; A61F2013/530802; A61F2013/53765; A61F2013/53782
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
84 words
A sterile, absorbent, non-adherent wound dressing suitable for use on deep wounds which dressing comprises an absorbent material contained within a porous bag, said absorbent material comprising individual pieces of a conformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film and in which there is additionally present between the perforated polymeric film and the pieces of foam a non-woven fabric comprising a mixture of rayon and polypropylene fibers with an uncompressed thickness of from 0.4 to 2 mm.
Claim 2
Dependent Claim
84 words
A sterile, absorbent, non-adherent wound dressing suitable for use on deep wounds which dressing comprises an absorbent material contained within a porous bag, said absorbent material comprising individual pieces of a conformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film and in which there is additionally present between the perforated polymeric film and the pieces of foam a non-woven fabric comprising a mixture of rayon and polypropylene fibers with an uncompressed thickness of from 0.4 to 2 mm.
Claim 3
Dependent Claim
45 words
A wound dressing according to claim 1 in which the hydrophilic foam is an open cell foam in which the cell size is from 30 μm to 700 μm and from 20 to 70% of the total membrane area of the cells are membrane openings.
Claim 4
Dependent Claim
31 words
A wound dressing according to claim 1 in which the pieces of foam have dimensions of from 3×3 to 7×7 mm and have a thickness of from 2 to 10 mm.
Claim 5
Dependent Claim
17 words
A wound dressing according to claim 1 in which the hydrophilic foam is a hydrophilic polyurethane foam.
Claim 6
Dependent Claim
19 words
A wound dressing according to claim 1 in which the hydrophilic foam is a foam containing a non-ionic surfactant.
Claim 7
Dependent Claim
83 words
A sterile, absorbent, non-adherent wound dressing suitable for use on deep wounds which dressing comprises an absorbent material contained within a porous bag, said absorbent material comprising individual pieces of a comformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film, in which the perforated film is in the form of a contoured net comprising a film of thermoplastic elastomer having depressions impressed out of the plane of the film each depression having an aperture at the bottom.
Claim 8
Dependent Claim
83 words
A sterile, absorbent, non-adherent wound dressing suitable for use on deep wounds which dressing comprises an absorbent material contained within a porous bag, said absorbent material comprising individual pieces of a comformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film, in which the perforated film is in the form of a contoured net comprising a film of thermoplastic elastomer having depressions impressed out of the plane of the film each depression having an aperture at the bottom.
Claim 9
Dependent Claim
34 words
A wound dressing according to claim 6 in which the thermoplastic elastomer comprises a blend of 40 to 90 parts by weight ethylene-vinyl acetate copolymer and 60 to 10 parts by weight of polystyrene.
Claim 10
Dependent Claim
30 words
A wound dressing according to claim 6 in which the area of an aperture is equivalent to the area of a circle having a diameter of 0.5 to 3 mm.
Claim 11
Dependent Claim
34 words
A wound dressing according to claim 6 in which the contoured net has fibers adhered to the depressions impressed out of the plane of the film whereby the apertures are crossed by the fibers.
Claim 12
Dependent Claim
46 words
A wound dressing according to claim 9 in which the fibres are formed by spraying a solution of the polymer of the fibres in a volatile solvent allowing the solvent to evaporate and catching the fibres so formed in the embossed surface of the contoured net.
Claim 13
Dependent Claim
24 words
A wound dressing according to claim 1 or 6 in which the dressing additionally contains a therapeutically effective amount of a physiologically active agent.
Claim 14
Dependent Claim
20 words
A wound dressing according to claim 1 or 6 which is sterile and is packaged in a bacteria proof pack.
Claim 15
Dependent Claim
45 words
A wound dressing according to claim 6 in which the hydrophilic foam is an open cell foam in which the cell size is from 30 μm to 70 μm and from 20 to 70% of the total membrane area of the cells are membrane openings.
Claim 16
Dependent Claim
32 words
A wound dressing according to claim 6 in which the pieces of foam have dimensions of from 3×3 mm to 7×7 mm and have a thickness of from 20 to 10 mm.
Claim 17
Dependent Claim
17 words
A wound dressing according to claim 6 in which the hydrophilic foam is a hydrophilic polyurethane foam.
Claim 18
Dependent Claim
19 words
A wound dressing according to claim 6 in which the hydrophilic foam is a foam containing a non-ionic surfactant.
Claim 19
Independent Claim
91 words
A method of treating a deep and exuding wound by applying to the wound a sterile absorbent, non-adherent wound dressing comprising an absorbent material contained within a water permeable porous bag, said absorbent material comprising individual pieces of conformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film and in which there is additionally present between the perforated polymeric film and the pieces of foam a non-woven fabric comprising a mixture of rayon and polypropylene fibers with an uncompressed thickness of from 0.4 to 2 mm.
Claim 20
Independent Claim
91 words
A method of treating a deep and exuding wound by applying to the wound a sterile absorbent, non-adherent wound dressing comprising an absorbent material contained within a water permeable porous bag, said absorbent material comprising individual pieces of conformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film and in which there is additionally present between the perforated polymeric film and the pieces of foam a non-woven fabric comprising a mixture of rayon and polypropylene fibers with an uncompressed thickness of from 0.4 to 2 mm.
Claim 21
Dependent Claim
48 words
A method of treating a wound according to claim 17 in which the hydrophilic foam is an open cell foam in which the cell size is from 30 μm to 700 μm and from 20 to 70% of the total membrane area of the cells are membrane openings.
Claim 22
Dependent Claim
30 words
A method according to claim 17 in which the pieces of foam have dimensions of from 3×3 to 7×7 mm and have a thickness of from 2 to 10 mm.
Claim 23
Dependent Claim
16 words
A method according to claim 17 in which the hydrophilic foam is a hydrophilic polyurethane foam.
Claim 24
Dependent Claim
18 words
A method according to claim 17 in which the hydrophilic foam is a foam containing a non-ionic surfactant.
Claim 25
Independent Claim
92 words
A method of treating a deep and exuding wound by applying to the wound a sterile absorbent, non-adherent wound dressing comprising an absorbent material contained within a water permeable porous bag, said absorbent material comprising individual pieces of a conformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film, in which the perforated polymeric film is in the form of a contoured net comprising a film of thermoplastic elastomer having depressions impressed out of the plane of the film each depression having an aperture at the bottom.
Claim 26
Independent Claim
92 words
A method of treating a deep and exuding wound by applying to the wound a sterile absorbent, non-adherent wound dressing comprising an absorbent material contained within a water permeable porous bag, said absorbent material comprising individual pieces of a conformable, resilient, absorbent hydrophilic foam and said bag being formed from a perforated polymeric film, in which the perforated polymeric film is in the form of a contoured net comprising a film of thermoplastic elastomer having depressions impressed out of the plane of the film each depression having an aperture at the bottom.
Claim 27
Dependent Claim
33 words
A method according to claim 22 in which the thermoplastic elastomer comprises a blend of 40 to 90 parts by weight ethylene-vinyl acetate copolymer and 60 to 10 parts by weight of polystyrene.
Claim 28
Dependent Claim
29 words
A method according to claim 22 in which the area of an aperture is equivalent to the area of a circle having a diameter of 0.5 to 3 mm.
Claim 29
Dependent Claim
33 words
A method according to claim 22 in which the contoured net has fibers adhered to the depressions impressed out of the plane of the film whereby the apertures are crossed by the fibers.
Claim 30
Dependent Claim
45 words
A method according to claim 25 in which the fibers are formed by spraying a solution of the polymer of the fibers in a volatile solvent allowing the solvent to evaporate and catching the fibers so formed in the embossed surface of the contoured net.
Claim 31
Dependent Claim
21 words
A method according to claim 22 in which the dressing additionally contains a therapeutically effective amount of a physiologically active agent.
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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) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |