Process for producing calcium phosphate ceramics having porous surface
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsYasuhiko Hirayama, Tetsuro Ogawa, Satoshi Ojima
Life of this patent
Estimating the term…
Abstract
A process for producing calcium phosphate ceramics having a porous surface is described, which comprise the steps of: a) preparing untreated calcium phosphate ceramics, which comprises a mixture of hydroxyapatite and tricalcium phosphate, and b) treating said untreated ceramics with an acidic solution to selectively dissolve the tricalcium phosphate in the surface of the ceramics.
Claims7
A process for producing calcium phosphate ceramics having a porous surface, comprising the steps of:
- a) preparing untreated calcium phosphate ceramics, said untreated ceramics comprising a mixture of hydroxyapatite and tricalcium phosphate;
- b) molding said untreated ceramics;
- c) firing said untreated ceramics;
- and
- d) contacting said untreated ceramics with an acidic solution to selectively dissolve the tricalcium phosphate in the surface of the ceramics but not selectively dissolve said hydroxyapatite;
- wherein the pH of the acidic solution is from 1 to 5.5.
A process for producing calcium phosphate ceramics having a porous surface according to claim 8, wherein said step of contacting untreated ceramic with an acidic solution is performed for a time period of from 1 second to 24 hours.
Calcium phosphate based ceramics having a porous surface produced by the process comprising the steps of:
- a) preparing untreated calcium phosphate ceramics, said untreated ceramics comprising a mixture of hydroxyapatite and tricalcium phosphate;
- b) molding said untreated ceramics;
- c) firing said untreated ceramics;
- and
- d) contacting said untreated ceramics with an acidic solution to selectively dissolve the tricalcium phosphate in the surface of the ceramics but not selectively dissolve said hydroxyapatite so that the inner density of said ceramics is maintained;
- wherein the pH of the acidic solution is from 1 to 5.5.
Dependencies are inferred from the claim text.