a solid or semisolid implant obtainable by providing a liquid composition comprising an aqueous solution of dextran with molecular weight of 1 . 0 - 100 kda and introducing the liquid composition into the body of a mammal , whereby the implant is formed in situ in the body of the mammal . a process for preparing a composition useful for biomedical application , comprising the steps of providing a liquid composition comprising an aqueous solution of dextran having a molecular weight of 1 - 100 kda ; and bringing the liquid composition to solidify ; whereby water is gradually eliminated from the liquid composition during the solidification . a biomedical article prepared from the composition .