PROBLEM TO BE SOLVED: To successfully observe an inner wall of a blood vessel by reliably obtaining a clear visual field in a wide-angle range.SOLUTION: A vascular endoscope system 10 includes: an endoscope 1 which can be inserted into the inside of a blood vessel a sheath tube 2 which houses the endoscope 1 in a longitudinal direction to form a gap 3 communicating in the longitudinal direction between an outer peripheral surface of the endoscope 1 and the sheath tube and has a squirting port 2d formed on a side wall of a distal end portion to penetrate in a wall thickness direction and a flow direction changing means 2b which changes the direction of a liquid, flowing in the longitudinal direction in the gap 3 from a proximal end of the sheath tube 2 to the distal end portion, to the outside in a radial direction in the distal end portion.COPYRIGHT: (C)2015,JPO&INPIT【課題】広角領域において透明な視界を確実に得て、血管内壁を良好に観察する。【解決手段】血管内に挿入可能な内視鏡1と、該内視鏡1の外周面との間に長手方向に連通する隙間3を形成するように内視鏡1を長手方向に沿って収容し、先端部分の側壁に壁厚方向に貫通形成された噴出口2dを有する外套管2と、隙間3を外套管2の基端から先端部分に向かって長手方向に流動する液体を先端部分において半径方向外方へ変化させる流動方向変更手段2bとを備える血管内視鏡システム10を提供する。【選択図】図1
