Patent ID: 8178499

Claim:
Hydrogel consisting of a cross-linked product obtained by photocuring an aqueous solution of an ester derivative of hyaluronic acid or of hyaluronic acid derivatives, wherein part of the carboxylic groups of hyaluronic acid or of hyaluronic acid derivatives is esterified with the propiophenone derivatives of formula (I) wherein R is selected from the group consisting of hydroxyl, alkyloxy having an alkyl chain C1-C20 bearing one or more hydroxyl groups, and heterocycle bearing one or more hydroxyl groups; and R 1 , R 2 and R 3 , equal or different amongst each other, are selected from the group consisting of hydrogen, hydroxyl, alkyl C1-C20 possibly substituted with one or more hydroxyl groups and alkyloxy C1-C20 possibly substituted with one or more hydroxyl groups, wherein said ester is in a concentration between 0.01 and 100% (w/w).