Methods for mitigating calcification and improving...

A - Human Necessities – 61 – L

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A61L 27/00 (2006.01) A61L 27/36 (2006.01)

Patent

CA 2261811

Methods for treating glutaraldehyde-fixed collagenous tissues to mitigate their propensity for subsequent calcification and to improve durability. Collagenous tissues which have been harvested and cross-linked by glutaraldehyde are exposed to a carboxyl activating agent to convert the free carboxyl (COOH) groups of the collagen molecules to activated carboxyl moieties (e.g., o-acylisourea). Thereafter, the collagenous tissue is exposed to a compound capable of reacting with the activated carboxyl moieties (e.g., o-acylisourea) to form non-carboxyl side groups. Monofunctional and multi-functional amines are examples of compounds which may be utilized to react with the activated carboxyl moieties to form such non-carboxyl side groups. Thereafter, the collagenous tissue is again exposed to glutaraldehyde. If the non-carboxyl side groups have functional amino groups (NH2), such additional exposure to glutaraldehyde will result in additional glutaraldehyde cross-linking of the collagen molecules and resultant improvement of durability.

Procédés de traitement de tissus collagènes fixés par du glutaraldéhyde afin de réduire leur propension à la calcification et d'améliorer la durabilité. Les tissus collagènes ayant été prélevés et réticulés par le glutaraldéhyde sont exposés à un agent activateur carboxyle afin de convertir les groupes carboxyle libres (COOH) des molécules de collagène en fractions carboxyle activées (par exemple, o-acylisourée). Ensuite, le tissu collagène est exposé à un composé capable de réagir avec les fractions carboxyle activées (par exemple, o-acylisourée) pour former des groupes latéraux non-carboxyle. Des amines mono-fonctionnelles et multi-fonctionnelles constituent des exemples de composés pouvant être utilisés pour réagir avec les fractions carboxyle activées afin de former ces groupes latéraux non-carboxyle. Ensuite, le tissu collagène est à nouveau exposé au glutaraldéhyde. Si les groupes latéraux non carboxyle présentent des groupes amino fonctionnels (NH2), une telle exposition additionnelle au glutaraldéhyde a pour résultat une réticulation additionnelle par le glutaraldéhyde des molécules de collagène et par conséquent une amélioration de la durabilité.

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