Patent ID: 7763019

Claim:
An electrosurgical instrument comprising: an elongated instrument body; a cylindrical member constituting the instrument body; an ultrasonic transducer provided at a proximal side of the instrument body and inside of the cylindrical member; an ultrasonic probe for applying an ultrasonic vibration of the ultrasonic transducer to a conductive fluid flowing into the inside of the cylindrical member at a distal side of the elongated instrument body, the ultrasonic probe being connected to the ultrasonic transducer and extending to a distal end of the instrument body in the inside of the cylindrical member; a fluid atomizing port provided at the distal side of the instrument body for injecting to a living tissue from the distal end of the instrument body the conductive fluid which was given the ultrasonic vibration by the ultrasonic probe and atomized; and an electrode provided at the distal side of the instrument body for discharging high-frequency electric energy along the conductive fluid atomized from the fluid atomizing port.