The present invention prevents a printing result desired by a user from being unable to be printed out, due to registration of the same color name for sheets of different colors. The system comprises a catheter body having a chamber containing a low acoustic impedance medium. Further aspects of the present invention relate to methods of removing a metal ion from a water stream and recovering a metal ion from a water stream, both of which include contacting a water stream containing a metal ion with an organo-ceramic composite material of the present invention under conditions effective to remove the metal ion from the water stream.