Hemostatic wound dressing and method of making same
The present invention is directed to wound dressings that contain a fabric made from biocompatible polymeric fibers and having flexibility, strength and porosity effective for use as a hemostat, and a porous, polymeric matrix prepared from a biocompatible, water-soluble or water-swellable polymer dispersed through the fabric; and to methods of making such wound dressings.
1. A process for making a wound dressing for use with moderate to severe bleeding, the wound dressing comprising a fabric that comprises oxidized regenerated cellulose fibers and a biocompatible, water-soluble or water-swellable polymer matrix of sodium carboxymethyl cellulose, the process consisting of the steps of:
providing a solution having dissolved therein sodium carboxymethyl cellulose,
providing a fabric having a top surface and a bottom surface opposing said top surface, said fabric having flexibility, strength and porosity effective for use as a hemostat,
immersing said fabric at least partially in said solution to distribute said solution at least partially through said fibers,
lyophilizing said fabric and said solution distributed at least partially through said fibers, thereby forming a porous polymeric matrix at least partially integrated with or about the fibers having a microporous structure with a large fluid absorbing capacity.
2. The process of claim 1 wherein said fabric is knitted.
3. The process of claim 1 wherein the weight ratio of said sodium carboxymethyl cellulose to said fabric is from about 1:99 to about 20:80.
4. The process of claim 3 wherein the weight ratio of said sodium carboxymethyl cellulose to said fabric is from about 3:97 to about 10:90.
5. A hemostatic wound dressing made in accordance with the process of claim 1 .
6. The wound dressing of claim 5 wherein the fibers are woven or nonwoven.
7. The wound dressing of claim 5 wherein the fibers are knitted.
8. The wound dressing of claim 5 wherein the weight ratio of said sodium carboxymethyl cellulose to said fabric is from about 1:99 to about 20:80.
9. The wound dressing of claim 8 wherein the weight ratio of said sodium carboxymethyl cellulose to said fabric is from about 3:97 to about 10:90.