Patent US4906240A successfully refreshed from Google Patents.
US4906240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive-faced porous absorbent sheet and method of making same
Assignee: MATRIX MEMBRANES Inc
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Filing: 1988-02-01
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Granted: 1990-03-06
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Expires: 2008-02-01
Abstract
Abstract A sheet-form material suitable as wound dressing and having enhanced moisture control properties is disclosed. This sheet-form material includes a porous sheet of absorbent, elastomeric segmented polyurethane having an open pore structure and an apertured adhesive facing on one side of the porous sheet. A liquid impermeable but water vapor permeable backing may be provided on the opposite side of the porous sheet, if desired. Also disclosed is a method for forming an apertured adhesive facing for the sheet-form material.
Inventors
- 👤 Andrew M. Reed
- 👤 Ian N. Askill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:54
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61F; A61F13/00; A61F13/02; A61F13/023; A61L15/42; A61L15/425; A61L15/58; A61F2013/00089; A61F2013/00246; A61F2013/00255; A61F13/15; A61F13/53; A61F2013/530802; A61F2013/53081
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
A sheet-form material suitable as a wound dressing which comprises a porous sheet of absorbent, elastomeric, polyurethane having an open pore structure and defining macropores at one surface of said sheet, and an adhesive wound facing layer on said sheet contiguous with said macroporecontaining surface and defining apertures that communicate with said macropores and provide fluid channels thereto; said porous sheet being a segmented polyurethane having a pore size gradient across the thickness dimension thereof and with the pore size decreasing in the direction away from the macropore-containing surface.
Claim 2
Dependent Claim
89 words
A sheet-form material suitable as a wound dressing which comprises a porous sheet of absorbent, elastomeric, polyurethane having an open pore structure and defining macropores at one surface of said sheet, and an adhesive wound facing layer on said sheet contiguous with said macroporecontaining surface and defining apertures that communicate with said macropores and provide fluid channels thereto; said porous sheet being a segmented polyurethane having a pore size gradient across the thickness dimension thereof and with the pore size decreasing in the direction away from the macropore-containing surface.
Claim 3
Dependent Claim
31 words
The sheet-form material of claim 1 further including a liquid impermeable but water vapor permeable backing secured to the porous sheet at the surface thereof opposite that having the adhesive layer.
Claim 4
Dependent Claim
21 words
The sheet-form material of claim 1 wherein the said adhesive layer has an aperture density of at least about 1 percent.
Claim 5
Dependent Claim
21 words
The sheet-form material of claim 1 wherein said adhesive layer has an aperture density of about 5 to about 15 percent.
Claim 6
Dependent Claim
22 words
The sheet-form material of claim 1 wherein fragments of said adhesive are retained within said macropores but without blocking said fluid channels.
Claim 7
Dependent Claim
18 words
The sheet-form material of claim 1 wherein said adhesive is a copolymer of 2-ethylhexyl acrylate and acrylic acid.
Claim 8
Dependent Claim
16 words
The sheet-form material of claim 6 wherein the adhesive contains about 15 mol-percent of acrylic acid.
Claim 9
Dependent Claim
11 words
The sheet-form material of claim 2 wherein said backing is hydrophilic.
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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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |