Patent ID: 9283283
Filing Date: 2016-03-15
CPC Classification: A61K,A61L,C08B,C08J,C08L

Claim Text:
1. A hydrogel comprising water and a hyaluronic acid derivative, wherein: the hyaluronic acid derivative comprises hyaluronic acid (HA), or a salt thereof, of molecular weight comprised between 50,000 and 3,500,000 Da, onto the N-acetyl-D-glucosamine moieties of which are grafted chains of a biodegradable and biocompatible polyester of molecular weight comprised between 3,000 and 900,000 Da, in an amount such that the derivative comprises between 1 and 50 of said polyester chains per 100 repeating units of D-glucuronic acid/N-acetyl-D-glucosamine of hyaluronic acid; the concentration of said hyaluronic acid derivative in the hydrogel is between 2 and 10% w/v, and the hydrogel has a shelf life of at least 6 month at ambient temperature.