| abstract |
1527592 Adhesive dressings IMPERIAL CHEMICAL INDUSTRIES Ltd 25 July 1975 [5 Aug 1974] 34338/74 Heading A5R [Also in Divisions B5 and Dl] A laminate wound dressing comprises a mat 15 of fibres prepared by electrostatically spinning an organic polymeric material or a precursor thereof dissolved or dispersed in a liquid and collecting the spun fibres on a suitable receiver and a backing layer 12, of greater area than the mat and having an adhesive facing 13 located on the same surface of the backing layer as the mat. Preferably the adhesive coats the whole front surface of the backing layer to yield an adhesive bandage. An absorbent pad 14 may be disposed between backing 12 and mat 15. The fibres may be spun from organic solutions of polyurethane, polyamide or polyacrylonitrile, aqueous dispersions of polyethylene terephthalate, silicones polytetrafluoroethylene (PTFE) or the above polymers, or aqueous solutions of polyvinyl alcohol, polyvinyl pyrrolidone, polyethylene oxide or ureaformaldehyde polymer precursor. The fibre forming solution or dispersion may contain zirconium oxide, titanium oxide, chromic oxide, magnesium oxide or hydroxide or calcium oxide or hydroxide to render the fibres wettable so that the dressing will encourage clotting of blood and halt bleeding. The fibres may have a diameter of 0.1 to 25 microns. Fibres of different diameter or composition may be applied from separate spinnerets in turn to form a non uniform mat or together to form a uniform mat. The mat may have a thickness of 25 to 1500 microns, a pore size of 1 to 500 microns and a porosity of as collected of 55 to 95%. which may be reduced to 1% by compression. |