PROBLEM TO BE SOLVED: To provide a medical tubular body capable of suppressing constriction of blood flow and lowering of shear stress.SOLUTION: The medical tubular body includes diameter-expandable tubular bodies including a plurality of supports having planes or ridge lines, and a cross-sectional drawing 25 of a support in a plane including an axis of the tubular body has the following characteristics (1)-(5). (1) A straight line L1 is parallel to the axis, and passes through a part in which the length of the cross-sectional drawing 25 in the axial direction Y of the tubular body is maximum, and points where the straight line L1 and a visible outline 26 of the cross sectional drawing 25 cross each other are defined as a first point 31 and a second point 32. (2) A straight line L2 parallel to the straight line L1 passes through a third point 33 that is on the visible outline 26 of the cross sectional drawing 25 and located at an innermost part of the radial direction X of the tubular body. (3) and (4) Straight lines L3 and L4 extending in the radial direction X pass through the first point 31 and the second point 32 respectively. (5) An area A1 of the cross-sectional drawing located radially X-inward the straight line L1 is smaller than an area A2 of a closed region enclosed by the straight lines L1-L4.SELECTED DRAWING: Figure 3【課題】血流阻害およびシェアストレスの低下を抑制することができる医療用管状体を提供する。【解決手段】医療用管状体は、平面または稜線を有する支柱を複数含み、拡径可能な管状体を有し、管状体の軸を含む平面における支柱の断面図形25が(1)~(5)の特徴を有する。(1)直線L1は軸に平行であり、管状体の軸方向Yにおける断面図形25の長さが最大である箇所を通っており、直線L1と断面図形25の外形線26が交わる点を第1点31と第2点32とする。(2)直線L1に平行な直線L2が断面図形25の外形線26上であって管状体の径方向Xの最内方に位置する第3点33を通る。(3)、(4)径方向Xに延在している直線L3、L4がそれぞれ第1点31、第2点32を通る。(5)直線L1よりも径方向Xの内方の面積A1が、直線L1~L4で囲まれる閉領域の面積A2よりも小さい。【選択図】図3
