Patent US4747401A successfully refreshed from Google Patents.
US4747401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical adhesive dressing
Assignee: Smith and Nephew PLC
•
Filing: 1986-11-03
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Granted: 1988-05-31
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Expires: 2006-11-03
Abstract
Abstract A surgical dressing which consists essentially of a film which carries an adhesive layer for securing the dressing to the body characterized in that (a) the film is continuous and comprises a polymer which in contact with water has a higher MVP than when in contact with moisture vapor but not water, (b) the adhesive layer is adapted to allow access of water to the film when water is in contact with the adhesive layer so that said surgical dressing has a MVP of not less than 2500 g/m 2 when the adhesive layer is in contact with water and has a MVP of not more than 2000 g/m 2 when the adhesive is in contact with moisture vapor but not water; whereby the dressing is suitable for use on exuding wounds and on non-exuding wounds.
Inventors
- 👤 William D. Potter
- 👤 David A. Rawlings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:17
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61F; A61F13/00; A61F13/02; A61F13/023; A61L15/22; A61L15/24; A61L15/26; A61L15/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A surgical dressing suitable for use on exuding wounds and on non-exuding wounds which consists essentially of a film which carries an adhesive layer for securing the dressing to the body wherein (a) the film is continuous and comprises a polymer which in contact with water has a higher MVP than when in contact with moisture vapour but not water and (b) the adhesive layer is adapted to allow access of water to the film when water is in contact with the adhesive layer so that (c) said surgical dressing has a MVP of not less than 2500 g/m 2 when the adhesive layer is in contact with water and has a MVP of not more than 2000 g/m 2 when the adhesive is in contact with moisture vapour but not water.
Claim 2
Dependent Claim
132 words
A surgical dressing suitable for use on exuding wounds and on non-exuding wounds which consists essentially of a film which carries an adhesive layer for securing the dressing to the body wherein (a) the film is continuous and comprises a polymer which in contact with water has a higher MVP than when in contact with moisture vapour but not water and (b) the adhesive layer is adapted to allow access of water to the film when water is in contact with the adhesive layer so that (c) said surgical dressing has a MVP of not less than 2500 g/m 2 when the adhesive layer is in contact with water and has a MVP of not more than 2000 g/m 2 when the adhesive is in contact with moisture vapour but not water.
Claim 3
Dependent Claim
29 words
A dressing according to claim 1 wherein the MVP is not more than 1500 g/m 2 when the adhesive layer is in contact with moisture vapour but not water.
Claim 4
Dependent Claim
25 words
A dressing according to claim 2 wherein the MVP is not less than 3200 g/m 2 when the adhesive layer is in contact with water.
Claim 5
Dependent Claim
30 words
A dressing according to claim 1 wherein the film comprises a hydrophilic polyurethane which when hydrated contains 5% to 50% of water and is from 15 to 80 microns thick.
Claim 6
Dependent Claim
30 words
A dressing according to claim 4 wherein the film comprises a hydrophilic polyurethane which when hydrated contains 10% to 40% of water and is from 20 to 60 microns thick.
Claim 7
Dependent Claim
19 words
A dressing according to claim 1 wherein the film is a hydrophilic polyurethane which is a hydrophilic polyether polyurethane.
Claim 8
Dependent Claim
24 words
A dressing according to claim 1 wherein the adhesive is an interrupted layer which leaves 30% to 70% of the film free of adhesive.
Claim 9
Dependent Claim
19 words
A dressing according to claim 1 wherein the adhesive comprises a polyvinyl ethyl ether or an acrylate surgical adhesive.
Claim 10
Dependent Claim
25 words
A dressing according to claim 1 in which the average weight per unit area of adhesive is 20 g/m 2 to 45 g/m 2 .
Claim 11
Dependent Claim
15 words
A dressing according to claim 1 in sterile form packaged in a bacteria proof package.
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |