PROBLEM TO BE SOLVED: To provide a medical device and a treatment method capable of effectively suppressing the flow into the kidneys of a contrast having been discharged into a blood vessel.SOLUTION: A medical device 10 for suppressing the flow of the contrast into the kidneys comprises: a long-length inner tube 20 and a discharge part 60 capable of discharging a fluid in a proximal direction on both sides across the axial center of the distal end of the inner tube 20, the discharge part 60 having plural discharge holes 63 aligned along one direction.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】血管内に放出した造影剤の腎臓への流入を効果的に抑制できる医療デバイスおよび処置方法を提供する。【解決手段】腎臓への造影剤の流入を抑制するための医療デバイス10であって、長尺な内管20と、内管20の遠位部の軸心を挟む両側で近位方向へ流体を放出可能な放出部60と、を有し、放出部60は、一方向へ並ぶ複数の放出孔63を有する。【選択図】図1