the present invention concerns the preparation of composite biomaterials constituted by hyaluronic acid and the derivatives thereof in combination with polymers that have electrically conductive properties . in particular , the methods of preparing biomedical devices formed by a two - or three - dimensional polysaccharide matrix and by an electrically conductive membrane . the matrix is constituted by hyaluronic acid derivatives in the form of membranes , woven fabrics , nonwoven felts , meshes , gauzes , guide channels or sponges , while the electrically conductive membrane is constituted by a film of polypyrrole in combination with hyaluronic acid or a derivative thereof .