Biomaterial

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 33/02 (2006.01) A61L 27/00 (2006.01) A61L 27/02 (2006.01) A61L 27/30 (2006.01) A61L 27/32 (2006.01) A61L 27/56 (2006.01) G01N 27/327 (2006.01) H01L 21/306 (2006.01) A61F 2/00 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2228426

Biomaterial, for example bioactive silicon, may be fabricated by anodising a silicon wafer to produce a wafer (10) having a porous silicon region (20). In vitro experiments have shown that certain types of porous silicon cause the deposition of apatite deposits both on the porous silicon (20) and neighbouring areas of bulk silicon (22) when immersed in a simulated body fluid solution. This deposition of apatite provides an indication that porous silicon of appropriate form is bioactive, and therefore also biocompatible. A form of porous silicon is dissolved in the simulated body fluid solution and this is an indication of a resorbable biomaterial characteristic. In addition to porous silicon, certain types of polycrystalline silicon exhibit bioactive characteristics. Bioactive silicon may be used in the fabrication of biosensors for in vitro or in vivo applications. The bioactivity of the bioactive silicon may be controlled by the application of an electrical potential thereto.

On peut fabriquer un biomatériau, par exemple du silicium bioactif, en anodisant une plaquette de silicium afin de produire une plaquette (10) présentant une région (20) de silicium poreux. Des expériences in vitro ont montré que certains types de silicium poreux provoquent le dépôt de particules d'apatite à la fois sur le silicium (20) poreux et sur les zones voisines du silicium (22) en masse, lorsque l'on immerge cette plaquette dans une solution d'un fluide corporel artificiel. Ce dépôt d'apatite apporte l'indication que le silicium poreux de forme appropriée est bioactif et, par conséquent, biocompatible. Une forme de silicium poreux se dissout dans ladite solution, et ceci constitue une indication d'une caractéristique propre à un biomatériau résorbable. Outre le silicium poreux, certains types de silicium polycristallin présentent des caractéristiques bioactives. On peut utiliser du silicium bioactif dans la fabrication de biocapteurs aux fins d'applications in vitro ou in vivo. On peut réguler la bioactivité de ce silicium en appliquant sur celui-ci un potentiel électrique.

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