US4146027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for dressing a wound
Assignee: Rohm and Haas Co
•
Filing: 1977-05-09
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Granted: 1979-03-27
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Expires: 1997-05-09
Abstract
Abstract A procedure is provided for producing a wound dressing having a crushed or uncrushed foam bonded to a woven, knit or nonwoven absorbent layer, particularly woven cotton gauze. The foam is self-bonded to the absorbent layer, i.e., no adhesive is needed to bond the foam. The foam may be applied by one of several methods. One procedure comprises applying a thin layer of foamed latex on a release medium. The dry foam, still on the release paper, is then simultaneously crushed and transfer bonded to the absorbent layer. A second method comprises applying the foam directly on the absorbent layer and crushing if desired. A third method comprises applying unfoamed material on the fabric and then causing foaming by the use of blowing agents then crushing if desired.
Inventors
- 👤 Charles E. Hoey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:32
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/425; A61F; A61F13/00; A61F13/00051; A61F13/00063; A61F13/01; A61F13/01008; A61F13/15; A61F13/53; A61F13/534; A61F13/539; A61F2013/00361; A61F2013/00727; A61F2013/00731; A61F2013/0074; A61F2013/00744; A61F2013/00902; A61F2013/0091; A61F13/15577; A61F2013/15821; A61F2013/530802; A61F2013/53445; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249975
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
104 words
A method for dressing a wound wherein the improvement comprises applying to said wound a sterile dressing comprising a layer of a foam permeable to liquids adhered to a layer of liquid absorbent material wherein the improvement is that said foam is crushed or uncrushed foam having a wet foam density of from about 0.05 to about 0.5 g./cc. and a dry foam density of from about 0.2 to about 3 g./cc. and a thickness of from about 1 mil to about 70 mils wherein said foam has a cohesive tear strength in the range of from about 0.5 p.l.i. to about 10 p.l.i.
Claim 2
Independent Claim
104 words
A method for dressing a wound wherein the improvement comprises applying to said wound a sterile dressing comprising a layer of a foam permeable to liquids adhered to a layer of liquid absorbent material wherein the improvement is that said foam is crushed or uncrushed foam having a wet foam density of from about 0.05 to about 0.5 g./cc. and a dry foam density of from about 0.2 to about 3 g./cc. and a thickness of from about 1 mil to about 70 mils wherein said foam has a cohesive tear strength in the range of from about 0.5 p.l.i. to about 10 p.l.i.
Claim 3
Dependent Claim
31 words
The method of claim 1 in which the foam is from about 10 to about 70 mils thick and the absorbent layer is selected from cellulosic textiles of cotton or rayon.
Claim 4
Dependent Claim
24 words
The method of claim 2 wherein the sterile wound dressing contains an additive selected from a germicide, deodorant, reodorant, antiseptic, antibiotic, antiinflammatory or anesthetic.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein the foam is thermoplastic.
Claim 6
Dependent Claim
26 words
The method of claim 4 wherein the polymer used to prepare the foam is prepared from 87.5% ethyl acrylate; 10.5% methyl methacrylate and 2.5% itaconic acid.
Claim 7
Dependent Claim
27 words
The method of claim 4 wherein the polymer used to prepare the foam is prepared from 66% ethyl acrylate, 32.7% methyl methacrylate and 1.3% of methacrylic acid.
Claim 8
Dependent Claim
18 words
The method of claim 4 wherein the polymer used to prepare the foam is prepared from ethyl acrylate.
Claim 9
Dependent Claim
18 words
The method of claim 4 wherein the polymer used to prepare the foam is prepared from butyl acrylate.
References Cited (Backward Citations)
US3648692A
Cited
US3849238A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |