Patent ID: 7449004

Claim:
An ultrasonic treatment system having an ultrasonic treatment device, and an endoscope used in combination with the ultrasonic treatment device, said ultrasonic treatment device comprising: an ultrasonic transducer unit having an ultrasonic transducer designed to treat a living tissue, and a cover member which covers the ultrasonic transducer; a flexible sheath which has a distal end part and a proximal end part, the distal end part being coupled to the cover member; a signal cable which has a distal end part and a proximal end part, the distal end part being connected to the ultrasonic transducer; a transducer drive unit which is connected to the proximal end part of the signal cable and designed to generate a drive signal for driving the ultrasonic transducer; an operation unit which is provided at the proximal end part of the sheath and designed to move the sheath, thereby to move the ultrasonic transducer unit in an axial direction of the sheath, wherein the endoscope includes an elongate insertion unit which is to be inserted into a body cavity and which has at least one channel, the cover member and flexible sheath of the ultrasonic treatment device have outside diameters smaller than the inside diameter of the channel of the endoscope, and the ultrasonic transducer unit is designed to move into and from the channel of the endoscope when the operation unit is moved in the axial direction of the sheath; the ultrasonic transducer has an axis, a main part, a horn and a treatment member, the horn having a distal end part and a proximal end part which is coupled to the main part, and being configured to amplify ultrasonic vibration generated by the main part, which is applied to the distal end part, and the treatment member being provided at the distal end part of the horn to abut on a living tissue to perform an ultrasonic treatment on the living tissue; and the ultrasonic transducer unit has a fastening member which secures the cover member at a vibration node of the ultrasonic transducer.