| 摘要 |
A foamed plastic and a method for its production are described. Tne foamed plastic has cavities which consist of open cells or pores. In at least a portion of the cavities, particles of water-insoluble hydrophilic polymer are homogeneously distributed, the particles being swellable to a gel in water. Examples of such polymer particles are granules of cross-linked dextran. The polymer particles are incorporated in the foamed plastic by being suspended in a liquid impregnating agent, such as ethanol-chloroform which is of substantially the same density as the polymer particles. A water-soluble binder, such as polyvinyl pyrrolidone, is also dissolved in the impregnating agent, and suitably also a plasticizing and surface active agent, such as a poloxamer. The foamed plastic is impregnated with the liquid suspension, whereafter the impregnating liquid is removed by drying. The polymer particles are anchored to the dried foamed plastic by means of the binder, whereas the polymer particles, on use of the foamed plastic product for, for example, treating a running sore, swell to form a gel such that they fill out the cavities of the foamed plastic and are retained because of steric hindrance. The foamed plastic product is int.al. usable as a bandage and/or for plugging to drain exudate from injured skin surfaces, such as running sores, and in the treatment of incontinence. Also non-clinical fields of use, such as the use of gel iodophore-provided foamed plastic for water purification, are included in the invention. |
