Abstract: An ultrasonic treatment apparatus includes an ultrasonic transducer that generates ultrasonic vibrations, a probe that includes a proximal end connected with the ultrasonic transducer, and transmits ultrasonic vibrations generated by the ultrasonic transducer from the proximal end to a distal end thereof, and a treatment portion that is formed at the distal end of the probe, and utilizes the transmitted ultrasonic vibrations to treat a living tissue. The treatment portion includes two or more protrusions.

Abstract: A coagulating cutter according to the present invention comprises: a transmitting member for transmitting energy, for treating living body tissue, to the living body tissue; an outer sheath through which the transmitting member is passed; and a grasping section supported at the tip end portion of the outer sheath so as to be capable of turning with respect to the transmitting member, which allows the living body tissue to be grasped against the transmitting member.

Abstract: There is provided an ultrasonic treatment apparatus including an ultrasonic oscillator which generates ultrasonic waves, a probe which is connected to the ultrasonic oscillator and transmits ultrasonic oscillations generated by the ultrasonic oscillator, and a treatment portion which is formed on the probe and treats a living tissue by the transmitted ultrasonic oscillations. The treatment portion has a cavitation suppressing portion formed to have such a shape that a pressure of a liquid in a vicinity of an external surface of the cavitation suppressing portion is greater than a saturation vapor pressure of the liquid in fluid analysis concerning ultrasonic oscillations in the liquid.

Abstract: A medical treatment instrument of the present invention includes an elongated insertion portion inserted into a body cavity, a treatment portion provided at a tip end of the insertion portion for treating a tissue in the body cavity by heating, a cylindrical member into which a part of the insertion portion is inserted, a flow passage formed between an outer circumference of the insertion portion and an inner circumference of the cylindrical member and through which one of a fluid supplied to the treatment portion and the fluid sucked from within the body cavity flows, an inlet/outlet communicating with the flow passage for performing one of supply of the fluid supplied to the treatment portion and discharge of the fluid sucked from within the body cavity, and an opening portion communicating with the flow passage and opened opposite to the treatment portion.