US4753231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive wound dressing
Assignee: Smith and Nephew PLC
•
Filing: 1986-10-27
•
Granted: 1988-06-28
•
Expires: 2006-10-27
Abstract
Abstract Moisture vapor transmitting wound dressings are described which comprise (a) a conformable backing layer which has an adhesive on one of its surfaces and in which at least one of the backing layer and adhesive layer is continuous so as to provide a barrier both to bacteria and to liquid water when the dressing is in place on a wound and (b) a low wound adherency absorbent pad positioned on the adhesive side of the backing layer. The area of the pad is less than that of the backing layer so that an adhesive margin remains exposed on two, or preferably four, sides of the pad so that the backing layer may be adhered to the skin surrounding the wound area. The wound dressings have a moisture vapor transmission rate of from 500 to 2000 grams/square meter/24 hours at 37.5° C. and 100% to 10% relative humidity difference. Materials for use in the dressings and processes for manufacture of the dressings are also described.
Inventors
- 👤 Stephen M. Lang
- 👤 David F. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:39
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/58; A61F; A61F13/00; A61F13/02; A61F13/023; A61F13/0243; A61F13/15; A61F13/51; A61F13/511; A61F13/51121; A61L15/22; A61L15/24; A61L15/26; A61L15/425; A61L15/46; A61F13/53; A61F13/534; A61F13/539; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00119; A61F2013/00157; A61F2013/00217; A61F2013/00221; A61F2013/00225; A61F2013/00246; A61F2013/00263; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00544; A61F2013/00582; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00761; A61F2013/00855; A61F2013/00876; A61F13/15577; A61F2013/15821; A61F2013/530802; A61F2013/53445; A61F2013/5395; A61L2300/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
185 words
A conformable wound dressing which comprises: (a) a low wound adherency wound facing layer 0.05 to 1 mm thick which is a conformable elastomer net; (b) an absorbent layer in the form of a pad 0.5 to 20 mm thick of conformable open cell foam of a hydrophilic polymer; and (c) a moisture vapor permeable adhesive coated backing layer which serves to adhere the dressing to the wound area, at least one of said adhesive and said backing layer being continuous and said wound dressing having a moisture vapor transmission rate of from 300 to 5,000 grams/square meter/24 hours at 37.5° C. at 100% to 10% relative humidity difference, said wound facing layer being laminated to one face of the absorbent layer and said backing layer being laminated to the opposing face of said absorbent layer, whereby the backing layer extends beyond the absorbent layer to act as a means of retaining the dressing whereby the wound dressing prevents ingress of bacteria and liquid water to the wound which is allowed to heal under moist conditions without causing the skin surrounding the wound to macerate.
Claim 2
Dependent Claim
185 words
A conformable wound dressing which comprises: (a) a low wound adherency wound facing layer 0.05 to 1 mm thick which is a conformable elastomer net; (b) an absorbent layer in the form of a pad 0.5 to 20 mm thick of conformable open cell foam of a hydrophilic polymer; and (c) a moisture vapor permeable adhesive coated backing layer which serves to adhere the dressing to the wound area, at least one of said adhesive and said backing layer being continuous and said wound dressing having a moisture vapor transmission rate of from 300 to 5,000 grams/square meter/24 hours at 37.5° C. at 100% to 10% relative humidity difference, said wound facing layer being laminated to one face of the absorbent layer and said backing layer being laminated to the opposing face of said absorbent layer, whereby the backing layer extends beyond the absorbent layer to act as a means of retaining the dressing whereby the wound dressing prevents ingress of bacteria and liquid water to the wound which is allowed to heal under moist conditions without causing the skin surrounding the wound to macerate.
Claim 3
Dependent Claim
26 words
A dressing according to claim 1 in which both the backing layer and the adhesive layer on one surface thereof are continuous and moisture vapor transmitting.
Claim 4
Dependent Claim
18 words
A dressing according to claim 2 in which the continuous moisture vapor transmitting backing layer is a polyurethane.
Claim 5
Dependent Claim
20 words
A dressing according to claim 2 in which the continuous moisture vapor transmitting adhesive layer is an acrylate ester copolymer.
Claim 6
Dependent Claim
28 words
A dressing according to claim 1 in which the elastomer net comprises a net in which the net has intersecting diagonal strands which form a diamond pattern net.
Claim 7
Dependent Claim
16 words
A dressing according to claim 1 in which the elastomer net is formed from a polyurethane.
Claim 8
Dependent Claim
27 words
A dressing according to claim 1 in which the elastomer net has 2 to 40 apertures per cm with a dimension of from 0.5 to 4 mm.
Claim 9
Dependent Claim
21 words
A dressing according to claim 1 in which the hydrophilic polymer comprising the conformable open cell foam is a hydrophilic polyurethane.
Claim 10
Dependent Claim
22 words
A dressing according to claim 1 in which the conformable open cell foam has a cell size of 50 to 500 microns.
Claim 11
Dependent Claim
32 words
A dressing according to claim 1 in which the conformable open cell foam is a foam in which 30% to 60% of the total membrane area of the cells are membrane openings.
Claim 12
Dependent Claim
15 words
A dressing according to claim 1 in which the dressing contains a topically effective medicament.
Claim 13
Dependent Claim
13 words
A sterile wound dressing according to claim 1 within a bacteria impervious pack.
References Cited (Backward Citations)
DE139942C
Cited
US2896618A
Cited
US3566871A
Cited
US3645835A
Cited
US3678933A
Cited
US3648692A
Cited
GB1440191A
Cited
US3888248A
Cited
US3927669A
Cited
US3978855A
Cited
US3972328A
Cited
US4146027A
Cited
US4233969A
Cited
US4203435A
Cited
US4156067A
Cited
US4231357A
Cited
US4181127A
Cited
US4340043A
Cited
US4341207A
Cited
GB2081177A
Cited
EP0050514A1
Cited
GB2093703A
Cited
GB2093702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |