Patent US5352508A successfully refreshed from Google Patents.
US5352508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Net wound dressings
Assignee: Systagenix Wound Management IP Co BV
•
Filing: 1993-03-04
•
Granted: 1994-10-04
•
Expires: 2013-03-04
Abstract
Abstract A net dressing in which the net substrate is encapsulated in a hydrophilic, tacky resin, the coating on the net substrate leaving the majority of the apertures in the net substrate unoccluded and a process for preparing the dressing.
Inventors
- 👤 Catherine L. Cheong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:42
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61F; A61F13/00; A61F13/02; A61F13/0203; A61F13/0206; A61F13/0209; A61F13/0213; A61L15/26; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T442/00; Y10T442/10; Y10T442/102; Y10T442/172; Y10T442/178; Y10T442/179
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
A pliant and comformable net dressing that adheres well to dry skin but does not adhere to wet skin and that comprises a net substrate, which has apertures whose smallest dimension is about 1.0 to 3.0 mm and which is encapsulated in a hydrophilic tacky resin, comprising either a polymerised hydrogel or a high molecular weight crosslinked polyurethane matrix containing at least one polyhydroxy compound having a number average molecular weight from 1,000 to 12,000 and a number average hydroxyl value from 26 to 110, the polyhydroxy compound comprising from 40 to 85% by weight based on the total weight of the matrix and the polyhydroxy compound, the resin being essentially free of polyhydroxy compounds having a molecular weight below 800, and the resin on the net substrate leaving the majority of the apertures in the net substrate unoccluded.
Claim 2
Dependent Claim
139 words
A pliant and comformable net dressing that adheres well to dry skin but does not adhere to wet skin and that comprises a net substrate, which has apertures whose smallest dimension is about 1.0 to 3.0 mm and which is encapsulated in a hydrophilic tacky resin, comprising either a polymerised hydrogel or a high molecular weight crosslinked polyurethane matrix containing at least one polyhydroxy compound having a number average molecular weight from 1,000 to 12,000 and a number average hydroxyl value from 26 to 110, the polyhydroxy compound comprising from 40 to 85% by weight based on the total weight of the matrix and the polyhydroxy compound, the resin being essentially free of polyhydroxy compounds having a molecular weight below 800, and the resin on the net substrate leaving the majority of the apertures in the net substrate unoccluded.
Claim 3
Dependent Claim
81 words
The net dressing of claim 1, wherein the hydrophilic, tacky resin comprises a high molecular weight crosslinked polyurethane matrix containing at least one polyhydroxy compound having a number average molecular weight from 1,000 to 12,000 and a number average hydroxyl value from 26 to 110, the polyhydroxy compound comprising from 40 to 85% by weight based on the total weight of the matrix and the polyhydroxy compound, the resin being essentially free of polyhydroxy compounds having a molecular weight below 800.
Claim 4
Dependent Claim
15 words
The net dressing of claim 1, wherein the hydrophilic, tacky resin comprises a polymerised hydrogel.
Claim 5
Dependent Claim
19 words
The net dressing of claim 1, wherein at least 75% of the apertures in the net substrate are unoccluded.
Claim 6
Dependent Claim
13 words
The net dressing of claim 1, wherein the resin contains fillers or additives.
Claim 7
Dependent Claim
21 words
The net dressing of claim 1, wherein the net substrate used to produce the net dressing is made from inelastic fibers.
Claim 8
Dependent Claim
15 words
The net dressing of claim 1, wherein the net substrate is made from continuous fibers.
Claim 9
Dependent Claim
15 words
The net dressing of claim 1, wherein the net substrate is knitted, woven or non-woven.
Claim 10
Dependent Claim
67 words
A continuous process for the production of the net dressing of claim 1, wherein a web of the net substrate is passed through the nip of a pair of coating rollers, wherein the resin is applied to the substrate, and on emerging from the nip, the coated substrate is subjected to a blast of air to reopen any apertures which may have been occluded during the coating.
Claim 11
Dependent Claim
18 words
The net dressing of claim 3 wherein the polymerized hydrogel is a derivatized polyacrylamide copolymer containing sulphonate groups.
Claim 12
Dependent Claim
19 words
The net dressing of claim 4 wherein at least 90% of the apertures in the net substrate are unoccluded.
References Cited (Backward Citations)
FR1153332A
Cited
US4404296A
Cited
EP0059048A1
Cited
US4524064A
Cited
US4661099A
Cited
US4904247A
Cited
WO1987005206A1
Cited
WO1988001878A1
Cited
US4929577A
Cited
US4960594A
Cited
US5035893A
Cited
US5156601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-03 | 1998-04-04 | 1998-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-03 | 2002-04-04 | 2002-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-03 | 2006-04-04 | 2006-10-04 | $7700.00 | Window Closed / Lapsed |