Methods for treating glutaraldehyde-fixed collagenous tissues to mitigate there 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)...http://www.google.com/patents/US5935168?utm_source=gb-gplus-sharePatent US5935168 - Glutaraldehyde-fixed bioprostheses
