Method for producing a three-dimensional macroporous...

B - Operations – Transporting – 22 – F

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B22F 3/22 (2006.01) B22F 7/00 (2006.01) C04B 35/63 (2006.01)

Patent

CA 2696386

The present invention relates to a method for producing a three-dimensional macroporous filament construct comprising interconnected microporous filaments showing a suitable surface roughness and microporosity. The method comprises the steps of: a) preparing a suspension comprising particles of a predetermined material, a liquid solvent, one or more binders and optionally one or more dispersants, b) depositing said suspension in the form of filaments in a predetermined three- dimensional pattern, preferably in a non-solvent environment, thereby creating a three-dimensional filament-based porous structure, c) inducing phase inversion, whereby said filaments are transformed from a liquid to a solid state, by exposing said filaments during the deposition of the filaments with a non-solvent vapour and to a liquid non-solvent, d) thermally treating the structure of step d) by calcining and sintering said structure. The invention further provides a three-dimensional macroporous filament construct comprising interconnected microporous filaments showing a specific surface roughness and microporosity. The invention also relates to various uses of the construct, including its use for the manufacture of a biomedical product, such as a synthetic bone implant or bone graft.

L'invention concerne un procédé de production d'une structure filamentaire macroporeuse tridimensionnelle comprenant des filaments microporeux interconnectés présentant une rugosité de surface et une microporosité appropriées. Ce procédé consiste : a) à préparer une suspension contenant des particules d'un matériau prédéterminé, un solvant liquide, au moins un liant et facultativement au moins un agent dispersant ; b) à déposer cette suspension sous la forme de filaments selon un motif tridimensionnel prédéterminé, de préférence dans un environnement exempt de solvant, ce qui permet d'obtenir une structure poreuse filamentaire tridimensionnelle ; c) à induire l'inversion de phase, les filaments étant transformés de l'état liquide à l'état solide par l'exposition des filaments pendant leur dépôt à une vapeur exempte de solvant et à un liquide exempt de solvant ; d) à traiter thermiquement la structure issue de l'étape d) par calcination et frittage. L'invention concerne également une structure filamentaire macroporeuse tridimensionnelle comprenant des filaments microporeux interconnectés présentant une rugosité de surface et une microporosité spécifiques. L'invention concerne enfin diverses utilisations de cette structure, notamment dans la fabrication d'un produit biomédical, tel qu'un greffon ou un implant osseux synthétique.

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