Microcapsules containing biomedical materials

A - Human Necessities – 61 – K

Patent

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Details

A61K 9/52 (2006.01) A61K 9/50 (2006.01)

Patent

CA 2485259

Biomedical materials are encapsulated in ionically crosslinked polymer capsules, preferably alginate microcapsules. The alginate capsules are then subjected, in a liquid vehicle, to an ethylenically unsaturated monomer and an initiator, to induce polymerization of the unsaturated monomer and thereby enhance the strength of the capsule wall. The microcapsules can be after- treated with, for example, polylysine and alginate to reduce their tendency to elicit an immune response if implanted in an animal. The invention extends to the microcapsules and also to a method of treating or preventing medical conditions in an animal particularly a human, by implanting microcapsules containing biomedical material in the animal.

Des substances biomédicales sont encapsulées dans des capsules polymères réticulées par voie ionique, de préférence, des microcapsules d'alginate. Les capsules d'alginate sont ensuite soumises, dans un support liquide, à un monomère éthyléniquement insaturé et à un initiateur, pour induire la polymérisation du monomère insaturé et améliorer ainsi la résistance de la paroi de la capsule. Les microcapsules peuvent ensuite être traitées avec, par exemple, de la polylysine et de l'alginate, pour réduire leur tendance à eliciter une réponse immunitaire lorsqu'elles sont implantées dans le corps d'un animal. L'invention concerne ces microcapsules ainsi qu'une méthode de traitement ou de prévention d'états pathologiques chez les animaux, en particulier les humains, qui consistent à implanter dans le corps de l'animal des microcapsules contenant une substance biomédicale.

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