The catheter according to the present invention is a catheter 1 which is used by being introduced into a body cavity and which sucks an object to be suctioned containing at least a liquid, and a cavity portion which communicates a proximal end side and a distal end side with each other, A tube body 12 having an opening that communicates the cavity with the outside on the distal end side, and an opening protection that is provided so as to cover the vicinity of the distal end of the tube body and prevents the opening from being blocked. The opening protection portion includes a plurality of isolation portions 115 for isolating the tissue in the body cavity from the opening, and the plurality of isolation portions are provided at a predetermined interval from each other. ing.本発明に係るカテーテルは、体腔内に導入して用いられ、少なくとも液体を含む吸引対象物を吸引するカテーテル１であって、近位端側と遠位端側とを連通する空洞部と、前記遠位端側において前記空洞部と外部とを連通する開口と、を備えるチューブ本体１２と、前記チューブ本体の遠位端近傍を覆うように設けられ、前記開口が閉塞することを防止する開口保護部１１と、を有しており、前記開口保護部は、前記体腔内の組織を前記開口から隔離する複数の隔離部１１５を備え、該複数の隔離部は互いに所定の間隔を空けて設けられている。
