Preparation of occlusive dressings

Abstract

A method of preparing an occlusive wound dressing involves preparing a slurry of an occlusive composition with a hydrophobic compound and a bacteriostatic agent, applying the occlusive composition on a fabric to produce a coated fabric, disposing the coated fabric in packaging, adding water onto at least one of the coated fabric and the packaging, sealing the packaging containing the coated fabric, and irradiating the sealed package to sterilize and produce the occlusive wound dressing. The occlusive wound dressing has from about 60 wt % to about 75 wt % hydrophobic compound, from about 2 wt % to about 5 wt % bacteriostatic agent, from about 2 wt % to about 5 wt % water, and from about 5 wt % to about 36 wt % fabric.

What is claimed: 
     
         1 . A wound dressing comprising yarns,
 wherein the yarns comprise:
 from about 5% to about 50% by weight cellulosic material, and 
 from about 50% to 95% by weight of a non-adherent polymeric material; and 
   wherein the yarns have a break factor from about 1.700 lb·Ne to about 2.500 lb·Ne.   
     
     
         2 . The wound dressing of  claim 1 , further comprising an antimicrobial agent. 
     
     
         3 . The wound dressing of  claim 2 , wherein the antimicrobial agent is selected from the group consisting of polyhexamethylene biguanide; 2,4,4′-trichloro-2′-hydroxydiphenyl ether; chlorhexidine and salts thereof, silver and salts or complexes thereof, polymyxin, tetracycline; aminoglycoside compounds; bacitracin; neomycin; chloramphenicol; miconazole; and combinations thereof. 
     
     
         4 . The wound dressing of  claim 2 , wherein the antimicrobial agent is present in the wound dressing in an amount from about 500 ppm to about 3,500 ppm. 
     
     
         5 . The wound dressing of  claim 4 , wherein the antimicrobial agent is present in the wound dressing in an amount from about 500 ppm to about 1,000 ppm. 
     
     
         6 . The wound dressing of  claim 3 , wherein the antimicrobial agent is polyhexamethylene biguanide. 
     
     
         7 . The wound dressing of  claim 1 , further comprising a bioactive agent. 
     
     
         8 . The wound dressing of  claim 7 , wherein the bioactive agent is selected from the group consisting of polyhexamethylene biguanide and bismuth tribromophenate. 
     
     
         9 . The wound dressing of  claim 8 , wherein the bioactive agent is bismuth tribromophenate. 
     
     
         10 . The wound dressing of  claim 7 , wherein the bioactive agent is present in the wound dressing in an amount from about 1 wt % to about 5 wt % by weight of the dressing. 
     
     
         11 . The wound dressing of  claim 1 , wherein the wound dressing is an occlusive wound dressing. 
     
     
         12 . The wound dressing of  claim 13 , wherein the fabric is comprised of at least one of cotton, polyester, rayon, cellulose acetate, and polyimide. 
     
     
         13 . The wound dressing of  claim 1 , wherein the wound dressing consisting essentially of:
 from about 60 wt % to about 75 wt % petrolatum,   from about 2 wt % to about 5 wt % bismuth tribromophenate,   from about 2 wt % to about 15 wt % water, and   from about 5 wt % to about 36 wt % fabric.   
     
     
         14 . The wound dressing of  claim 13 , wherein the fabric is a woven fabric. 
     
     
         15 . The wound dressing of  claim 14 , wherein the woven fabric comprises first and second yarns. 
     
     
         16 . The wound dressing of  claim 15 , wherein the first yarns comprise cellulosic fibers. 
     
     
         17 . The wound dressing of  claim 15 , wherein the second yarns comprise nonadherent polymeric fibers. 
     
     
         18 . The wound dressing of  claim 17 , wherein the non-adherent polymeric fibers can be a polymer selected from the group consisting of polyethylene, polypropylene, polyfluoroethylene, polyfluoropropylene, polyfluoroethylene glycol, polytetrafluoroethylene, polyethylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate, polybutylene terephthalate, and combinations thereof. 
     
     
         19 . The wound dressing of  claim 13 , wherein the fabric is a nonwoven fabric.