The invention discloses a heterogeneous layered mineralized
coating on the surface of a medical
implant. The surface of the medical
implant is sequentially provided with a dense
chitosan layer, a porous mineralized
chitosan layer and a mineralized collagen /
chitosan cross-linking layer from bottom to top. With Collagen, chitosan, a
calcium-containing compound and a
phosphorus-containing compound as raw materials, the heterogeneous layered mineralized
coating is assembled once on the surface of a medical
metal basal body through electrochemical reaction in a water solution, and the deposition state of each phase can be adjusted by adjusting the electrolytic deposition parameter, therefore, the heterogeneous layered mineralized
coating is prepared. The method provided by the invention is simple and feasible and high in
controllability; the medical material coating prepared with the method can promote the attachment and the propagation of cells on the surface of the coating and has a function of carrying drugs and enhanced bioactivity; and the
bonding strength of the coating and a
metal base plate is high, and the stability is favorable.