Patent ID: 7687138

Claim:
A porous calcium phosphate ceramic body comprising a substrate having fine pores, and three-dimensional nanotunnel layers having pluralities of three-dimensionally connected nanotunnels formed on wall surfaces of said fine pores by mixing together calcium phosphate particles, a dispersant and water to form a slurry in a single dispersion state or near a single dispersion state, immersing said substrate in said slurry, and defoaming said slurry under reduced pressure, wherein said three-dimensional nanotunnel layers are formed in the fine pores inside the substrate, wherein a thickness of said three-dimensional nanotunnel layers is from 20 to 300 nm, wherein at least part of said nanotunnels have openings communicating with the fine pores of said substrate and said openings have an average diameter of 1 to 200 nm, and wherein the substrate and the three-dimensional nanotunnel layers are made from calcium phosphate.