Wound treatment-dressing and method of manufacture

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 antimicrobials as active agents, the active agents being incorporated into the mechanically active foam matrix both protruding from the foam cell surface and integrally within the foam cell wall, whereby the foam functions 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 open-cell foam is made by the steps of:
• physically mixing a given weight percentage of each antimicrobial agent, in the form of particles, into the polymer foam ingredients prior to foaming;
• and
• producing a finished manufactured foam wound treatment-dressing from the polymer foam ingredients, including the antimicrobial agents, in a foaming step such that the antimicrobials are mechanically included in the foam cell wall upon foaming, whereby some quantity of antimicrobial particles will be totally encapsulated into the wall's polymer structure with the remaining quantity protruding through the polymer wall boundary to be physically exposed into the void space of the open-foam cell, the incorporation of the antimicrobial particles during the foaming step resulting in the antimicrobial particles being physically captured and no longer mobile.
• wherein the particles which are encapsulated into the foam's cell structure and wall comprise the combination 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 finished manufactured foam wound treatment-dressing 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 foam body which makes up the finished manufactured foam wound treatment-dressing has a thickness in the range from about 2 to 10 mm.