US4565736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous surgical compress with cover layer autogenously bonded to absorption layer
Assignee: Carl Freudenberg KG
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Filing: 1983-03-21
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Granted: 1986-01-21
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Expires: 2003-03-21
Abstract
Abstract A surgical compress is described which is made of an absorptive layer and a wound covering layer, the covering layer spun or otherwise made of nonwoven hydrophobic fibers so that absorption of wound secretions is facilitated.
Inventors
- 👤 Karl H. Stein
- 👤 Manfred Krull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:17
CPC Classifications
A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/613; Y10T442/681; Y10T442/69
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
A fibrous surgical compress, which comprises: a fibrous absorption layer and an overlapping, liquid permeable, fibrous cover layer having a smooth outer surface which is free of protruding nap and fiber ends, the cover layer being autogeneously bonded to the absorption layer by direct formation of tacky cover layers fibers on the absorption layer, said tacky fibers thereafter drying to produce pressureless, interlayer autogeneous bonding and pressureless, random fashion, intralayer fiber autogeneous bonding; said fibers being comprised of hydrophobic, hydrolysis-resistant, aliphatic urethane fibers.
Claim 2
Dependent Claim
83 words
A fibrous surgical compress, which comprises: a fibrous absorption layer and an overlapping, liquid permeable, fibrous cover layer having a smooth outer surface which is free of protruding nap and fiber ends, the cover layer being autogeneously bonded to the absorption layer by direct formation of tacky cover layers fibers on the absorption layer, said tacky fibers thereafter drying to produce pressureless, interlayer autogeneous bonding and pressureless, random fashion, intralayer fiber autogeneous bonding; said fibers being comprised of hydrophobic, hydrolysis-resistant, aliphatic urethane fibers.
Claim 3
Dependent Claim
27 words
A surgical compress according to claim 1 wherein the outer surface of the cover layer is free of protruding nap and fiber ends of the absorption layer.
Claim 4
Dependent Claim
30 words
A surgical compress according to claim 1 wherein the surface of the absorption layer bonded to the cover layer is smooth and is free of protruding nap and fiber ends.
Claim 5
Dependent Claim
16 words
A surgical compress according to claim 1 wherein the surfaces of the polyurethane fibers are microporous.
Claim 6
Dependent Claim
20 words
A surgical compress according to claim 1 wherein the surfaces of the polyurethane fibers are smooth and free of pores.
Claim 7
Dependent Claim
12 words
A surgical compress according to claim 5 wherein the fibers are endless.
Claim 8
Dependent Claim
20 words
A surgical compress according to claim 1 wherein the polyurethane fibers have a length of about 4 to 80 cm.
Claim 9
Dependent Claim
14 words
A surgical compress according to claim 1 wherein the fibers have a circular cross-section.
Claim 10
Dependent Claim
12 words
A surgical compress according to claim 1 wherein the fibers are endless.
Claim 11
Dependent Claim
84 words
A method for manufacturing a surgical compress, said compress being described by claim 1, which comprises: smoothing the absorptive layer on calendar rollers and spinning the hydrophobic fibers of the covering layer directly onto the absorptive layer while the absorptive layer is warm, wherein the spinning and calendering conditions are adjusted so that the fibers are deposited on the warm absorptive layer while still tacky but retain their identity and bond to each other and to the absorptive layer without further heat or pressure.
Claim 12
Dependent Claim
15 words
A method according to claim 10 wherein the fibers are spun using an extrusion-spinning process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |