Ceramic material having an even distribution of micropores

A - Human Necessities – 61 – L

Patent

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Details

A61L 27/56 (2006.01) A61L 27/00 (2006.01) A61L 27/42 (2006.01)

Patent

CA 2524982

The application relates to a biomaterial comprising a ceramic material, the ceramic material having a plurality of connecting micropores of an average diameter of between (1) ~m and (10) ~m, substantially evenly distributed through the biomaterial. The ceramic particles are preferably partially fused to one or more adjacent ceramic particles to form a lattice defining micropores. Each particle preferably has an average diameter of (1) ~m to (10) ~m and may comprise a plurality of elongated macropores having an average diameter of between (150) ~m and (500) ~m. Furthermore, the material preferably additionally contains midi-pores which are substantially spherical and have an average diameter of (5) ~m to (150) ~m. The document also discloses processes for preparing the biomaterial comprising: (i) preparing a mixture of finely-divided biocompatible ceramic particles with a coating agent; (ii) causing the coating agent to coat the ceramic particles to form coated particles; (iii) causing the coated particles to form a body; and (iv) heating the body to eliminate residues of the coating agent, to partially fuse the ceramic particles and produce a fused biomaterial, and to biomaterials obtainable from the process and to the uses of the biomaterials.

L'invention concerne un biomatériau contenant un matériau céramique, ce matériau céramique ayant une pluralité de micropores de connexion d'un diamètre moyen compris entre (1) ?m et (10) ?m et répartis de manière sensiblement uniforme dans le biomatériau. Les particules céramique sont, de préférence, partiellement fusionnées à au moins une particule céramique adjacente pour former des micropores définissant un réseau. Chaque particule a, de préférence, un diamtère moyen de (1) ?m à (10) ?m et peut contenir une pluralité de macropores allongés ayant un diamètre moyen compris entre (150) ?m et (500) ?m. Le matériau, de préférence, contient également des midi-pores qui sont sensiblement sphériques et ont un diamètre moyen de (5) ?m à (150) ?m. Le document concerne également des procédés destinés à la préparation du biomatériau consistant: (i) à préparer un mélange de particules céramique biocompatibles finement divisées avec un agent d'enrobage; (ii) à amener l'agent d'enrobage à enrober les particules céramique pour former des particules enrobées; (iii) à amener les particules enrobées à former un corps et (iv) à chauffer le corps pour éliminer les résidus de l'agent d'enrobage pour partiellement fusionner les particules céramique et produire un biomatériau fusionné. L'invention concerne enfin les biomatériaux obtenus selon ce procédé et les utilisations de ces biomatériaux.

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