C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 18/00 (2006.01) A61F 2/30 (2006.01) A61L 24/02 (2006.01) A61L 27/32 (2006.01) C23C 24/08 (2006.01) C23C 30/00 (2006.01) A61F 2/00 (2006.01) A61F 2/28 (2006.01)
Patent
CA 2470036
The invention relates to a novel method for coating substrates with calcium phosphate. Prior art methods do not permit temperature-sensitive substrates or particles to be coated with calcium phosphates or it requires several method steps for carrying out this coating. The aim of the novel method is to be able to carry out a simple coating for all materials as well as for particles. To this end, the invention provides that the substrate to be coated is placed in a calcium phosphate gel, whereupon this substrate that is coated with the gel is dried. Afterwards, the calcium phosphate particles not adhering to the substrate are removed. According to the invention, the substrate can also be placed inside a colloidal solution of SiO2 containing a calcium phosphate, whereupon the mixture is constantly set in motion, the solvent is removed, and the substrate is provided with a calcium phosphate layer by condensing the colloidal SiO2 on the surface of the substrate. The coated substrates can, particularly when it concerns coated particles, be used as bone substitute material.
Les procédés connus ne permettent pas de recouvrir de phosphates de calcium des substrats ou des particules thermosensibles, ou bien impliquent plusieurs étapes de recouvrement. L'invention concerne un nouveau procédé permettant d'effectuer un recouvrement simple pour tous les matériaux et toutes les particules. Selon l'invention, le substrat est placé, en vue de son recouvrement, dans un gel de phosphate de calcium et le substrat recouvert de gel est séché. Pour finir, les particules de phosphate de calcium n'ayant pas adhéré au substrat sont éliminées. Selon l'invention, le substrat peut également être placé dans une solution colloïdale de SiO¿2? contenant un phosphate de calcium, le mélange étant agité ensuite en continu. Le solvant est éliminé et le substrat est muni d'une couche de phosphate de calcium par condensation du SiO¿2? colloïdal sur la surface du substrat. Les substrats recouverts peuvent s'utiliser comme matériau substitut osseux, notamment lorsqu'il s'agit de particules enrobées.
Becker Petra
Buhrmeister Mischa
Neumann Hans-Georg
Teller Marianne
Dot Gmbh
Ridout & Maybee Llp
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