Reinhard Warnking, Eugene J Jung, Yong Zou, Jacques Seguin, Mano Iyer: Methods and apparatus for treatment of mitral valve insufficiency. Jones Day, July 15, 2010: US20100179424-A1

Mitral valve insufficiency is treated by introducing an expansible device such as a balloon bearing a an ultrasonic transducer into the heart so that the transducer is positioned adjacent the mitral annulus but spaced from the mitral annulus, and actuating the transducer to heat the mitral annulus, ...