Inorganic shaped bodies and methods for their production and...

C - Chemistry – Metallurgy – 01 – B

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C01B 25/32 (2006.01) A61L 27/12 (2006.01) C04B 28/34 (2006.01) C04B 32/00 (2006.01) C04B 38/00 (2006.01) A61K 47/02 (2006.01)

Patent

CA 2359488

Shaped, preferably porous, inorganic bodies are provided which are prepared from a reactive blend. In accordance with one preferred embodiment, the solution is absorbed into a porous sacrificial substrate such as a cellulose sponge. The solution-saturated substrate is heated and an oxidation-reduction reaction occurs thereby forming an inorganic solid. A shaped, inorganic body is formed in situ. Optional, but preferred additional thermal treatment of the shaped, inorganic body removes the organic substrate, leaving an inorganic body that faithfully mimics the porosity, shape, and other physical characteristics of the organic substrate. Inorganic substrates may also be used to good effect. Large varieties of shaped bodies can be prepared in accordance with other embodiments of the invention and such shapes find wide use in surgery, laboratory and industrial processes and otherwise. The invention also provides chemically and morphologically uniform powders, including those having iniformly small sizes.

L'invention concerne des corps inorganiques façonnés, de préférence poreux, qui sont élaborés à partir d'un mélange réactif. Dans un mode préféré de réalisation, la solution est absorbée dans un substrat poreux sacrifié tel qu'une éponge de cellulose. Le substrat saturé de solution est chauffé, et une réaction d'oxydation-réduction permet de former un solide inorganique. Un corps inorganique façonné est formé in situ. Un traitement thermique supplémentaire, facultatif mais préféré, du corps inorganique façonné permet d'éliminer le substrat organique, et d'obtenir un corps inorganique qui imite fidèlement la porosité, la forme et d'autres caractéristiques physiques du substrat organique. Des substrats inorganiques peuvent également être utilisés avec une bonne efficacité. On peut élaborer une grande diversité de corps façonnés selon d'autres modes de réalisation de l'invention, ces formes étant largement utilisées en chirurgie, dans des processus de laboratoire et industriels et autres. L'invention concerne également des poudres uniformes d'un point de vue chimique et morphologique, y compris celles qui présentent de petites dimensions uniformes.

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