| 摘要 |
<p>A handpiece (21) of a surgical treatment apparatus includes a vibrating portion (24) having an axial length (L1) being a length corresponding to substantially one wavelength or above of the ultrasonic vibration, the vibrating portion (24) includes a vibration generating portion (26) formed on a proximal-end side of the vibrating portion (24) and having an axial length (11) being a length corresponding to substantially a quarter wavelength of the ultrasonic vibration, and a vibration transmitting portion (31) formed on a distal-end side of the vibrating portion (24) and having an axial length (12) being a length corresponding to substantially a three-quarter wavelength or above of the ultrasonic vibration, the vibration transmitting portion (31) includes a reduced diameter portion (36) arranged on the proximal-end side of the vibration transmitting portion (31), and an extending portion (37) arranged on the distal-end side of the vibration transmitting portion (31) and having an outside diameter (d) smaller than an outside diameter (D) of the vibration generating portion (26), and the operating portion (49) is arranged in an accommodation space (50) formed on a radially outer side of the extending portion (37) along the extending portion (37) in the handpiece (21).</p> |
