A biocompatible, biodegradable, copolymer is prepared from cross-linking a polylactic acid with a polysaccharide such as dextran. The resulting copolymer is a biodegradable hydrogel or solid having both hydrophobic and hydrophilic properties and provides for a mechanism in which biologically active agents may be covalently bonded to the dextran prior to incorporation of the dextran into a copolymer, and the subsequent release of the biologically active agents as the copolymer degrades.

Um biocompatible, biodegradable, copolymer é preparado do cross-linking um ácido polylactic com um polysaccharide tal como o dextran. O copolymer resultante é um hydrogel biodegradable ou contínuo tendo propriedades hydrophobic e hydrophilic e fornece para um mecanismo em que os agentes biològica ativos podem covalently ser ligados ao dextran antes da incorporação do dextran em um copolymer, e a liberação subseqüente dos agentes biològica ativos porque o copolymer degrada.

 
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