An expandable member that is configured to engage an interior region of a prosthetic valve and capable of transitioning from a pre-deployment configuration at a pre-deployment temperature, where the expandable member is capable of being positioned in the valve at an interior valve region when the valve is disposed in a cardiovascular structure, to a post-deployment configuration when the expandable member is subjected to cardiovascular tissue temperature, where an outer surface region of the valve proximate the interior valve region is placed in intimate contact with host cardiovascular tissue of the cardiovascular structure at a first position and seals perivalvular leaks present at the first cardiovascular structure position.
