Patent ID: 8728513
Filing Date: 2014-05-20
Classification: A61L,Y10T

Abstract:
1. A light-stable wound dressing comprising gel-forming fibers having anti-microbial activity, comprising a first fibre which is gel-forming and substantially insoluble in water having silver (I) cations bonded by ion-exchange thereto and discoloring on exposure to light, the addition of silver having no significant effect on the absorbency of the first fibre, wherein the wound dressing consists of a uniform blend of the first fibre and a second fibre of lyocell which is substantially free from silver, said wound dressing comprising from 0.01 to 5.0 percent by weight of silver (I) cations based on the total weight of first and second fibres, whereby the discoloration of the blend on exposure to light is lessened compared with the discoloration on exposure to light of a batch of the first fibre having the same average amount of silver cations present as is present in the blend.