Implant i.e. injectable by subcutaneous or intradermal way in the form of a monophasic hydrogel, comprises hyaluronic acid (0.5-5 wt.%, preferably 2 wt.%), in which 50-95 wt.%, preferably 85 wt.% of hyaluronic acid is present in the form of cross linked gel, 5-50 wt.%, preferably 15 wt.% of the hyaluronic acid is present in the free form or in the form of one of its salts, a molecular mass is 500-2800 kDa, preferably 1000-1500 kDa, and the ratio of the cross linked hyaluronic acid gel weight and free hyaluronic acid weight is 1:1 to 1:0.5, in a carrier fluid. An independent claimS are included for: (1) a kit in the form of syringe comprising the injectable implant； and (2) a preparation of the injectable implant comprising introducing the hyaluronic acid in an isosmolar fluid and basic buffer fluid； inflating, cross linking and homogenizing by heat under slow agitation； neutralizing the obtained gel and eliminating the cross-linking agent； adding hydrated hyaluronic acid by a basic buffer solution； homogenizing the mixture； optional degassing； conditioning in flacons or syringes； and sterilizing. ACTIVITY : Dermatological. MECHANISM OF ACTION : None given. No biological data given.
