Hydroxylapatite gel

C - Chemistry – Metallurgy – 01 – B

Patent

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Details

C01B 25/32 (2006.01) A61K 9/20 (2006.01) A61L 27/00 (2006.01) A61L 27/12 (2006.01) A61L 27/32 (2006.01) C04B 35/447 (2006.01) A61F 2/00 (2006.01)

Patent

CA 2291677

The invention relates to a hydroxylapatite gel obtained through a sol-gel process, in which an alkaline aqueous solution of a calcium slat is reacted with an alkaline aqueous solution of a phosphate salt in a calcium and phosphorus molar ratio in the range of 1.67 to obtain a sol. The sol in then transformed into a gel by hydrothermal treatment. The hydroxylapatite gel thus obtained exhibits excellent properties for use as a binding agent in moldable hydroxylapatite materials, comprising a granular filling material containing calcium in addition to the gel. The filling material is also preferably a hydroxylapatite material. Shaped bodies can be obtained from the hydroxylapatite material, which are most suitable for use in bone surgery and as filtering materials. The invention further relates to a metal implant comprising a coating of the inventive hydroxylapatite material. The invention also concerns a method for producing the hydroxylapatite gel, the shaped bodies and the coated metal implant.

L'invention concerne un gel d'hydroxylapatite, pouvant être obtenu par un processus sol-gel, selon lequel on fait réagir une solution aqueuse alcaline d'un sel de calcium avec une solution aqueuse alcaline d'un sel de phosphate, dans un rapport molaire entre le calcium et le phosphore de l'ordre de 1,67, pour obtenir un sol qui est ensuite converti en gel par un traitement hydrothermique. Le gel d'hydroxylapatite ainsi obtenu se prête parfaitement à une utilisation comme liant dans des matières d'hydroxylapatite moulables, qui contiennent, outre le gel, une charge granulaire renfermant du calcium. De préférence, cette charge est également constituée d'hydroxylapatite. La matière d'hydroxylapatite moulable permet d'obtenir des corps moulés qui se prêtent parfaitement à une utilisation dans la chirurgie osseuse et comme matériaux de filtre. L'invention concerne en outre un implant métallique comportant un revêtement constitué de la matière d'hydroxylapatite de l'invention. Elle concerne également un procédé pour la production de ce gel d'hydroxylapatite, du corps moulé et de l'implant métallique revêtu.

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