Patent ID: 7815658

Claim:
An ultrasonic treatment apparatus comprising: a vibrator assembly which generates ultrasonic vibration; a probe which includes a proximal end detachably mounted to the vibrator assembly and a distal end having a treatment portion, the probe being configured to transmit the ultrasonic vibration from the proximal end to the treatment portion thereof; a handle assembly to which the vibrator assembly and the probe are detachably mounted respectively, the handle assembly including a handle to be operated by an operator; a treatment assembly which includes: an action portion which faces the treatment portion of the probe and turns around with respect to the treatment portion; a pipe-shaped drive member having a distal end and a proximal end, and is connected to the action portion at the distal end thereof and configured to transmit an operation force of the handle assembly from the proximal end to the distal end thereof, wherein the probe is slidably received within the pipe-shaped drive member; a treatment assembly connecting member which is provided in the proximal end of the drive member, the treatment assembly connecting member being detachably mounted to the handle assembly; and an outward projection portion formed in the distal end of the drive member, and protruding toward a radially outward direction, the treatment assembly being detachably mounted to the handle assembly when the action portion and the drive member are assembled; and a sheath assembly covering an outer periphery of the treatment assembly, the sheath assembly including a sheath assembly connecting member which is detachably mounted to the handle assembly, and the sheath assembly being engaged with the outward projection portion of the treatment assembly at the distal end side of the drive member without disassembling parts, wherein the handle assembly includes a sheath connecting member connected to the sheath assembly connecting member and a drive member connecting member connected to the treatment assembly connecting member, the sheath assembly connecting member includes at least two fixed arms extending to a proximal end side of the sheath, and the fixed arms respectively include an outward protrusion portion that protrudes toward a radially outward direction and the outward protrusion portion being detachably engaged with the sheath connecting member.