Vibration transmitting member, ultrasonic treatment instrument, vibrating body unit, and method of manufacturing vibration transmitting member

摘要

Each of the plurality of segments of the vibration transmitting member corresponds to a half-wavelength portion between two corresponding vibration antinodes adjacent to each other, and is symmetrical with respect to the longitudinal direction about the vibration node between the vibration antinodes. In each of the plurality of concave segments in the segment, the vibration node is located in the groove, and an intermediate extending portion extends from the proximal end to the distal end of the groove in the longitudinal direction. At least two of the concave segments are different from each other in at least one of a dimension in the longitudinal direction of the intermediate extending portion and a cross-sectional area perpendicular to the longitudinal direction of the intermediate extending portion.