In order to be able to recognize under the ultrasonic image pickup method which uses the ultrasonic image pickup system which

摘要

A catheter for use in a patient's body lumen, having a shaft section configured to minimize ultrasonic image artifacts and the direct ultrasonic image brightness of the shaft surface and its internal components, and to produce its image at a wide range of imaging angles, preferably with an intensity not substantially different than surrounding tissue of the body lumen under ultrasound visualization. The shaft section is operative for the desired use of the catheter, yet is also configured to facilitate accurately imaging the shape and location of the shaft section, and easily differentiate it from the surrounding anatomy without unduly obscuring the images of the adjacent anatomy using an ultrasound imaging system.