New hydroxapatite calcium phosphates, their method of...

A - Human Necessities – 61 – K

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A61K 33/42 (2006.01)

Patent

CA 2563816

The present invention is directed to calcium phosphates in granular form having an X-ray diffraction pattern characteristic of hydroxyapatite in which a portion of the anions of the crystal lattice are substituted with carbonate anions and which have good compressibility and flow properties in direct compression applications. The invention is also directed to the methods for preparing the calcium phosphate aforesaid granules characterized in that the methods include the processing of a brushite dicalcium phosphate solution having a specified particle size distribution using a solution of an alkaline earth carbonate for a sufficient period of time to allow the transformation of the brushite calcium phosphate into hydroxyapatite calcium phosphate.

La présente invention concerne des phosphates de calcium granulaires présentant une caractéristique de diagramme de diffraction des rayons X de l'hydroxyapatite, dans laquelle une partie des anions du réseau cristallin est substituée par des anions de carbonate, et qui présentent de bonnes propriétés de compressibilité et rhéologiques dans des applications de compression directe. L'invention concerne également des méthodes de préparation desdites granules de phosphate de calcium, qui se caractérisent en ce qu'elles consistent à traiter une solution de phosphate bicalcique de brushite présentant une granulométrie spécifiée avec une solution d'un carbonate alcalino-terreux, pendant une durée suffisante pour permettre la transformation du phosphate calcique de brushite en phosphate de calcium d'hydroxyapatite.

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