METHOD FOR PRODUCING POROUS CALCIUM DEFICIENT HYDROXYAPATITE GRANULES

The method is for producing porous calcium deficient hydroxyapatite granules and comprises the following steps: (a) subjecting granules of calcium sulfate anhydrous (CSA), calcium sulfate dihydrate (CSD) or calcium sulfate hemihydrate (CSH) to an incubation in an alkaline aqueous solution having a p...

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Bibliographische Detailangaben
Hauptverfasser:	BOHNER, MARC, VAN GARDEREN, NOEMIE, SEEHERMAN, HOWARD, VANDERPLOEG, ERIC, DE GASPARO, ALEX
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:	The method is for producing porous calcium deficient hydroxyapatite granules and comprises the following steps: (a) subjecting granules of calcium sulfate anhydrous (CSA), calcium sulfate dihydrate (CSD) or calcium sulfate hemihydrate (CSH) to an incubation in an alkaline aqueous solution having a pH-value of less than 10 and containing PO4 3- ions; whereby the granules of calcium sulfate anhydrous (CSA), calcium sulfate dihydrate (CSD) or calcium sulfate hemihydrate (CSH) comprise interconnected pores with a minimum mean diameter of 3 microns; (b) washing with water the granules obtained after incubation of step a); (c) drying the obtained porous granules of calcium deficient hydroxyapatite; whereby (d) the amount-of PO4 3- ions present in the incubation of step a) is at least as large as the amount of SO4 2- ions of the granules used for step (a). The porous calcium deficient hydroxyapatite granules obtained by the invention may be purposefully used as carriers for biologically active substances in particular for proteins.