Yasuhiko Hirayama, Haruko Ikata, Satoshi Ojima, Hiromi Matsuzaki: Artificial intervertebral disc. Asahi Kogaku Kogyo Kabushiki Kaisha, Sandler Greenblum & Bernstein, August 7, 1990: US04946378 (423 worldwide citation)

An artificial intervertebral disc comprises a pair of end bodies which are provided, on their outer surfaces, with apatite layers. The disc includes a medical synthetic polymeric intermediate which is held between the end bodies through connecting members.

Yasuhiko Hirayama, Haruko Ikata, Satoshi Ojima: Apatite coated article and process for producing the same. Asahi Kogaku Kogyo, Sughrue Mion Zinn Macpeak & Seas, July 7, 1992: US05128146 (23 worldwide citation)

An apatite coated article comprising a substrate having thereon an apatite layer which is formed by flame spraying apatite powder at from about 2,000.degree. to 4,000.degree. C., and a process for producing such an apatite coated article.