Patent US4667665A successfully refreshed from Google Patents.
US4667665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-occlusive burn and trauma dressing
Assignee: Smith and Nephew Inc
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Filing: 1986-02-18
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Granted: 1987-05-26
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Expires: 2006-02-18
Abstract
Abstract A non-medicated dressing having a non-adherent permeable outer casing and a multi-strata absorbent interior composition. The outer casing of the dressing includes a skin contacting layer formed of superimposed strata of perforated high density polyethylene film. An exterior layer of the casing includes a lamination of permeable polyethylene film and a layer of absorptive material, the combination having a density and thickness specifications which maintain the structural integrity of the dressing. The dressing has a soft and cushioned exterior finish which conforms to the body contour. The dressing is manufactured in accordance wtih a method which employs a combined cutting and ultrasonic sealing apparatus.
Inventors
- 👤 Carlos Blanco
- 👤 Anthony Siragusa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:56
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/15577; A61F13/15707; A61F13/15739; A61F13/00051; A61F13/00063; A61F13/01; A61F13/01021; A61F13/01029; A61F13/51; A61F13/511; A61F13/5116; A61F13/512; A61F13/5123; A61F13/513; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; B; B29; B29C; B29C65/00; B29C65/02; B29C65/08; B29C65/083; B29C65/086; B29C65/74; B29C65/743; B29C65/7443; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/20; B29C66/24; B29C66/242; B29C66/2424; B29C66/24243; B29C66/24244; B29C66/244; B29C66/2442; B29C66/40; B29C66/41; B29C66/43; B29C66/433; B29C66/70; B29C66/71; B29C66/72; B29C66/723; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81415; B29C66/81421; B29C66/81422; B29C66/816; B29C66/8167; B29C66/83; B29C66/836; B29C66/8362; A61F13/84; A61F13/8405; A61F2013/00089; A61F2013/00157; A61F2013/00217; A61F2013/00246; A61F2013/00251; A61F2013/00361; A61F2013/00365; A61F2013/00519; A61F2013/00855; A61F2013/00859; A61F2013/15821; A61F2013/51355; A61F2013/51372; A61F13/514; A61F13/51401; A61F2013/51409; A61F13/53; A61F13/534; A61F2013/53445; B29C66/834; B29C66/8341; B29C66/83441
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
157 words
A non-occlusive dressing adapted for conforming arrangement on a person's body contour, said dressing comprising: (a) a skin contacting layer comprising two superimposed strata of a film, said film being made of a non-adherent material and provided with a plurality of perforations; (b) an absorbent interior layer comprising a homogeneous absorbent material loosely compacted within the dressing, said material substantially retaining exudates from the body which permeate through said skin contacting layer, said perforations of said skin contacting layer dimensioned to eliminate passage of said absorbent material from said interior layer to a patient's skin; and (c) an exterior layer comprising a film member, said skin contacting layer and said exterior layer being positioned in overlying and sealing relation with respect to said interior layer to form an integral dressing, the exterior layer having sufficient thickness to maintain the structural integrity of the dressing when the absorbent interior layer is saturated with exudates, topical medications and fluids.
Claim 2
Dependent Claim
157 words
A non-occlusive dressing adapted for conforming arrangement on a person's body contour, said dressing comprising: (a) a skin contacting layer comprising two superimposed strata of a film, said film being made of a non-adherent material and provided with a plurality of perforations; (b) an absorbent interior layer comprising a homogeneous absorbent material loosely compacted within the dressing, said material substantially retaining exudates from the body which permeate through said skin contacting layer, said perforations of said skin contacting layer dimensioned to eliminate passage of said absorbent material from said interior layer to a patient's skin; and (c) an exterior layer comprising a film member, said skin contacting layer and said exterior layer being positioned in overlying and sealing relation with respect to said interior layer to form an integral dressing, the exterior layer having sufficient thickness to maintain the structural integrity of the dressing when the absorbent interior layer is saturated with exudates, topical medications and fluids.
Claim 3
Dependent Claim
40 words
A non-occlusive dressing according to claim 1, wherein said skin contacting and exterior layers have substantially planar configurations and substantially opposing peripherally extending edge portions, the skin contacting and exterior layers being sealed to each other at said peripheral edges.
Claim 4
Dependent Claim
27 words
A non-occlusive dressing according to claim 1, wherein said skin contacting layer performance are dimensioned and sufficiently dense to render said film permeable to said body exudates.
Claim 5
Dependent Claim
22 words
A non-occlusive dressing according to claim 2, wherein said exterior layer is permeable to topical medications and fluids applied to the dressing.
Claim 6
Dependent Claim
60 words
A non-occlusive dressing according to claim 2, wherein: said skin contacting layer comprises two strata of a high-density polyethylene film; said absorbent interior layer comprises a layer of cellulose strata and a stratum of blended polyester and rayon; and said exterior layer comprises a lamination of a stratum of high-density polyethylene film and a stratum of blended polyester and rayon.
Claim 7
Dependent Claim
28 words
A non-occlusive dressing according to claim 5, wherein each of said two strata of polyethylene film of said skin contacting layer has a perforation density of approximately 34%.
Claim 8
Dependent Claim
34 words
A non-occlusive dressing according to claim 6, wherein each of said two strata of perforated polyethylene film has an approoximate thickness of 4.3 mils and a density of approximately 15 pounds per cubic foot.
Claim 9
Dependent Claim
70 words
A non-occlusive dressing according to claim 5 wherein the absorbent interior layer includes at least five strata of cellulose material having an approximate per strata thickness of 13.2 mils and basic weight of 0.162 lb. per square yard ±10%, and the blended polyester and rayon stratum is approximately 70% polyester and 30% rayon and as a thickness of approximately 0.5 inches and density of approximately 194 grams per square yard.
Claim 10
Dependent Claim
39 words
A non-occlusive dressing according to claim 5, wherein the exterior layer includes a perforated polyethylene film having a perforation density of approximately 34%, a thickness of approximately 4.3 mils and a density of approximately 15 pounds per cubic foot.
Claim 11
Dependent Claim
56 words
A non-occlusive dressing according to claim 5, wherein the blended polyester and rayon component of said exterior layer is approximately 80% polyester and 20% rayon, has a thickness in the range of 30 to 35 mils, a weight of 4.5±10% oz. per square yard, and a permeability rate of 200±15 cubic feet per minute of airflow.
Claim 12
Dependent Claim
24 words
A non-occlusive dressing according to claim 2, wherein the peripheral edge portions of said skin contacting and exterior layers are sealed by ultrasonic energy.
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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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |