Capping bioprosthetic tissue to reduce calcification

A - Human Necessities – 61 – L

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Details

A61L 27/54 (2006.01) A61L 27/36 (2006.01)

Patent

CA 2710366

A treatment for bioprosthetic tissue used in implants or for assembled bioprosthetic heart valves to reduce in vivo calcification. The method includes applying a calcification mitigant such as a capping agent or an antioxidant to the tissue to specifically inhibit oxidation in tissue. Also, the method can be used to inhibit oxidation in dehydrated tissue. The capping agent suppresses the formation of binding sites in the tissue that are exposed or generated by the oxidation and otherwise would, upon implant, attract calcium, phosphate, immunogenic factors, or other precursors to calcification. In one method, tissue leaflets in as-sembled bioprosthetic heart valves are pretreated with an aldehyde capping agent prior to dehydration and sterilization.

Cette invention concerne un traitement de tissu bioprosthétique utilisé dans les implants ou pour des valvules cardiaques bioprosthétique en vue d'en réduire la calcification in vivo. Le procédé consiste à appliquer un agent limitant la calcification, par exemple un agent protecteur ou un antioxydant sur le tissu de manière à inhiber spécifiquement l'oxydation dans le tissu. Egalement, le procédé peut être utilisé pour inhiber l'oxydation dans un tissu déshydraté. L'agent protecteur supprime la formation de sites de liaison dans le tissu qui sont exposés ou générés par l'oxydation et qui, sinon après implantation, attireraient le calcium, le phosphate, les facteurs immunogènes ou d'autres précurseurs de calcification. Dans un procédé, des feuillets tissulaires dans les valvules cardiaques bioprosthétique sont prétraités avec un agent de protection aldéhyde avant déshydratation et stérilisation.

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