Ultrasonic cleaning is effective in removing carbonized clots and tissue from the insulation‐tipped diathermic knife‐2 oleh Kei Murakami, Daizen Hirata, Kengo Haraguchi, Noriko Arai, Koji Inoue, Yuka Miyazaki, Kimihiro Funase, Tadao Nakashige, Akira Teramoto, Mineo Iwatate, Santa Hattori, Mikio Fujita, Wataru Sano, Yasushi Sano