PROBLEM TO BE SOLVED: To provide an imaging diagnosis catheter which has improved performance for delivery to a lesioned part and which can be disposed in the lesioned part without expanding the lesioned part.SOLUTION: An imaging diagnosis catheter 100 includes: a sheath 110 having a tip opening part 111 which is inserted into a living body lumen； a drive shaft 140 provided so as to rotate, and move forward and backward in an axial direction of the sheath within the sheath, an imaging core 150 which has an ultrasonic vibrator 151 capable of transmitting/receiving an ultrasonic wave and a housing 152 holding the ultrasonic vibrator and which is provided at the tip of drive shaft, and a tip member 160 which has a coil 161 for guiding the movement of the sheath in the living body lumen and which is provided at the tip of the imaging core. The tip of the coil can be protruded from the tip opening part of the sheath in accordance with the movement of the drive shaft to a tip side.SELECTED DRAWING: Figure 3【課題】病変部への送達性がより一層向上され、かつ、病変部を押し広げることなく病変部内に配置可能な画像診断用カテーテルを提供する。【解決手段】画像診断用カテーテル１００は、先端開口部１１１を備え、生体管腔に挿入されるシース１１０と、シース内において、回転可能およびシースの軸方向に進退移動可能に設けられる駆動シャフト１４０と、超音波を送受信可能な超音波振動子１５１および超音波振動子を保持するハウジング１５２を備え、駆動シャフトの先端部に設けられるイメージングコア１５０と、生体管腔内においてシースの移動をガイドするコイル１６１を備え、イメージングコアの先端部に設けられた先端部材１６０と、を有する。コイルの先端部は、駆動シャフトの先端側への移動に伴ってシースの先端開口部から突出可能である。【選択図】図３
