A hydrogel forming system which comprises a hydrophobic macromer with unsaturated group terminated ends and a hydrophilic polymer which is a polysaccharide (e.g., dextran) containing hydroxy groups which are reacted with unsaturated group introducing compound, is convertible by free radical polymerization to form a hydrogel containing a three dimensional crosslinked polymer network containing hydrophobic and hydrophilic components. Agent can be entrapped in the polymer network, e.g., drugs, macromolecules or synthetic or natural polymers, for controlled release therefrom.

Un hydrogel que formaba el sistema que abarca un macromer hidrofóbico con el grupo no saturado terminó extremos y un polímero hidrofílico que es un polisacárido (e.g., dextran) conteniendo a los grupos hydroxy que se reaccionan con el grupo no saturado que introduce el compuesto, es convertible por la polimerización del radical libre formar un hydrogel que contenía una red reticulada tridimensional del polímero que contenía componentes hidrofóbicos e hidrofílicos. El agente puede ser encerrado en la red del polímero, e.g., drogas, macromoléculas o polímeros sintéticos o naturales, para el lanzamiento controlado therefrom.

 
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