In a therapeutic situation with thin catheter using ultrasound, the inducing method with the catheter, which comes from inside to outside of human body, is essentially necessary. In the experiment, we formed two foci with opposite phase with 6 mm distance in 60 mm from the 2D array transducer (with 256 elements, frequency 1 MHz, and 120 mm curvature radius). According to the linear displacement of the foci in the azimuth direction, a catheter (diameter 0.2 mm) set between the two foci was bent with the maximum displacement of 0.19 mm as the cantilever law. From the result, we have confirmed the possibility to manipulate a thin catheter in the perpendicular position from ultrasound elements.
