Patent ID: 8227656

Claim:
A wound treatment-dressing, comprising: a dressing body having at least a wound contacting surface layer which is formed from a hydrophilic, capillary active, medically inert, moisture permeable, urethane open-cell foam which provides conformational area contact over the wound treatment area without local non-contact; wherein the foam which makes up at least the wound contacting surface of the dressing body exists as a foam matrix comprised of interconnected foam cells with cell walls which have incorporated therein a combination of inorganic antimicrobial particles as active agents, the active agents being incorporated into the foam matrix both protruding through the foam cell wall and integrally within the foam cell wall, whereby the foam functions by capillary and hydrophilic action as a liquid absorber with liquid exudate being absorbed from the wound treatment area into the foam matrix where it is retained against free flow out of the wound treatment-dressing and is kept away from the wound to facilitate healing, whereby microbial organisms are removed from the wound and killed in an external killing zone; wherein the particles which are encapsulated into the foam matrix consist of gentian-violet, methylene-blue and colloidal or ionic silver, wherein the gentian-violet and methylene-blue components are present in the foam matrix as nano-sized particles which range in spherical diameter from about 19 microns to 8000 microns, and wherein the dressing body having the previously described characteristics comprises a finished manufactured foam wound treatment-dressing which has an antimicrobial concentration of each of the gentian-violet, methylene-blue and colloidal or ionic silver components in the range from 0.0001% to 9% (gr/gr) by weight of each component; and wherein the dressing body which makes up the finished manufactured foam wound treatment-dressing has a thickness in the range from about 2 to 10 mm.