Dressing exhibiting low tissue ingrowth and negative-pressure treatment method
A dressing for treating a tissue site, particularly a peritoneal or abdominal site, is disclosed. The dressing may comprise: a substrate; an adherent layer coupled to a surface of the substrate; and a fibrous layer comprising fibers coupled to a surface of the adherent layer opposite the substrate. Typically, the fibrous layer satisfies one or more of the following: at least 75% of the fibers are coupled approximately perpendicular to the surface of the substrate; at least 95% of the fibers in the fibrous layer have a length to diameter aspect ratio from about 10 to about 1000; and no more than 10% of the fibers are coupled approximately tangential to the surface of the substrate. Optionally, the fibrous layer may be formed by a flocking process. Methods of treating various tissue sites using the dressings and negative-pressure therapy are also disclosed.
1. A dressing for treating a tissue site, the dressing comprising:
a substrate configured to allow fluid removal;
an adherent layer coupled to a surface of the substrate and configured to allow fluid removal; and
a fibrous layer comprising fibers coupled to a surface of the adherent layer opposite the substrate, at least a portion of the fibers having grooves along a length of each fiber;
wherein at least 75% of the fibers are coupled approximately perpendicular to the surface of the substrate.
2. The dressing of claim 1 , wherein at least 95% of the fibers in the fibrous layer have a length to diameter aspect ratio from about 10 to about 1000.
3. The dressing of claim 1 , wherein no more than 10% of the fibers are coupled approximately tangential to the surface of the substrate.
4. The dressing of claim 1 , wherein the fibers in the fibrous layer comprise a polysaccharide, a cellulosic material, collagen, a polyamide, a polyester, a polyether, a polyurethane, or a combination thereof.
5. The dressing of claim 4 , wherein the fibrous layer comprises viscose or rayon fibers.
6. The dressing of claim 1 , wherein the grooves have an average width at half-depth from about 0.4 mm to about 1.5 mm.
7. The dressing of claim 1 , wherein the substrate is perforated or fenestrated, or wherein the substrate comprises an open-cell foam, a mesh, paper, non-woven fibers, or woven fibers.
8. The dressing of claim 1 , wherein the substrate comprises a thermoplastic elastomer, a polyurethane, poly(vinyl chloride), a polyester, a polyether, a polystyrene copolymer, or a combination thereof.
9. The dressing of claim 1 , wherein the adherent layer comprises a hydrocolloid.
10. The dressing of claim 1 , wherein the coupled combination of the substrate, adherent layer, and fibrous layer is configured to be sized by a user to fit the tissue site.
11. The dressing of claim 1 , wherein an effective amount of one or more of an antiseptic and an antimicrobial agent is present on or in the fibrous layer.
12. The dressing of claim 1 , wherein the substrate comprises an absorbent material adapted to reduce, inhibit, or eliminate granulation in vivo and configured to absorb fluid.
13. The dressing of claim 1 , wherein the fibrous layer is formed by a flocking process.
14. The dressing of claim 1 , further comprising a sealing member disposed atop the substrate and configured to form a seal with the tissue site.
15. The dressing of claim 14 , wherein the tissue site is a compartmented tissue site and the sealing member comprises a polyurethane drape and an adhesive layer configured to sealably couple the polyurethane drape to tissue surrounding the compartmented tissue site.
16. The dressing of claim 14 , wherein the tissue site is a surface tissue site and the sealing member comprises a backing layer and an adhesive layer configured to sealably couple the backing layer to tissue surrounding the surface tissue site.
17. A system for treating a tissue site with negative pressure, the system comprising:
a dressing comprising:
a substrate configured to allow fluid removal;
an adherent layer coupled to a surface of the substrate and configured to allow fluid removal; and
a fibrous layer comprising fibers coupled to a surface of the adherent layer opposite the substrate, at least a portion of the fibers having grooves along a length of each fiber,
wherein at least 75% of the fibers are coupled approximately perpendicular to the surface of the substrate; and
a negative-pressure source fluidly coupled to the dressing and configured to enable fluid removal through the dressing via a plurality of fluid removal pathways.
18. The system of claim 17 , further comprising:
a negative-pressure conduit; and
a negative-pressure connector subsystem for fluidly coupling the negative-pressure source to the dressing for fluid removal via the plurality of fluid removal pathways.
19. The system of claim 18 , further comprising a container fluidly coupled to the negative-pressure source and the dressing and adapted to collect fluid.