Monodisperse black carbon nanoparticles (average diameter: 272 and 511 nm) are prepared by carbonization of monodisperse spherical π-conjugated polymer particles. Meanwhile, silica nanoparticles of different sizes are prepared by conventional...

Reports of mitral valve replacement after MitraClip removal have increased; however, surgical re-intervention is risky due to patients’ frailty and comorbidities. We report a case of mitral valve repair after MitraClip failure using the daVinci surgical system for a 55-year-old man with many comorbidities and two previous cardiac surgeries. The daVinci surgical system allows detailed handling with high-resolution visualization and endowrist instruments that provide surgeons with clear three-dimensional images and stabilized handling. This procedure enables us to remove the MitraClip precisely while preserving the mitral valve leaflet.

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