Wound dressings and materials suitable for use therein

Details Wound dressings and materials suitable for use therein Wound dressings and materials suitable for use therein

A - Human Necessities

61

L

A61L 15/28 (2006.01) A61L 15/60 (2006.01) C08B 11/12 (2006.01)

Patent

CA 2335563

Carboxymethylated cellulosic articles having degree of substitution in the range from 0.12 to 0.35 and in which the carboxymethyl groups are believed to be predominantly within the amorphous regions to the exclusion of the crystalline regions have usefully non-adherent properties as wound dressings. Such wound dressings may be made by carboxymethylating a cellulose fabric so that its absorbency is little greater after carboxymethylation than beforehand and the degree of substitution is as stated above. Carboxymethylation can be carried out by contacting cellulose II fibres or other articles with a solution containing sodium hydroxide, sodium chloroacetate, water and ethanol. The solution may contain from 4 to 8 percent by weight sodium hydroxide and from 50 to 60 percent by weight water (including water in the fibre) or the weight ratio of sodium hydroxide to water (including water in the article) may be from 0.095 to 0.115 and the weight ratio of cellulose in the article to water (including water in the article) may be from 0.22 to 0.28.

L'invention porte sur des articles cellulosiques carbométhylés présentant un taux de substitution compris entre 0,12 et 0,35 dans lequel les groupes carbométhyle devraient se situer en prédominance dans la zone amorphe à l'exception de des zones cristallines. Du fait de leurs propriétés de non adhérence, ils se prêtent à la fabrication de pansements réalisés par carbométhylation de tissus de cellulose, ce qui en améliore légèrement le pouvoir absorbant, leur taux de substitution étant défini ci-dessus. La carbométhylation peut s'obtenir en mettant en contact des fibres de cellulose II ou d'autres articles avec une solution contenant de l'hydroxyde de sodium, du chloroacétate de sodium, de l'eau et de l'éthanol, à raison de 4 à 8 % en poids d'hydroxyde de sodium et de 50 à 60 % en poids d'eau (dont celle de la fibre) ou dont le rapport pondéral hydroxyde de sodium/eau est compris entre 0,095 et 0,115, et le rapport pondéral cellulose/eau (dont celle de la fibre) entre 0,22 et 0,28.

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