PROBLEM TO BE SOLVED: To provide guide wire, etc., in which a back shadow in a tomographic image is reduced while maintaining permeability of the guide wire in an affected area, and a precise symptom of the affected area can be recognized based on the sharpened tomographic image.SOLUTION: A guide wire 1 is characterized in that core wire includes a core wire rear end large-diameter part 21, a core wire middle thin-diameter part 25 and a core wire tip small-diameter part 26 from the rear end to the tip. The core wire middle thin-diameter part 25 is positioned in a range of retracting a probe included in the sheath of an image diagnostic catheter to the rear end side while rotating the probe. Even if a hydrophilic coating 6 formed in an outer circumference of the core wire middle thin-diameter part 25 absorbs water and swells to increase a film thickness, the optical absorption with the water is extremely reduced, so that a dark back shadow is never expanded by the increased film thickness amount added therein. Then, a dynamic friction coefficient is lowered by the swelled hydrophilic coating 6, and thereby sliding properties are drastically increased.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2016,JPO&INPIT【課題】ガイドワイヤの病変部での通過性を維持しながら断層画像内のバックシャドーの低減を図り、鮮明化した断層画像に基づいて正確な病変部の症状が認識できるガイドワイヤ等を提供する。【解決手段】ガイドワイヤ1は、芯線が後端から先端へ、芯線後端径大部21と芯線中間細径部25と芯線先端径小部26とを備える。芯線中間細径部25は、画像診断用カテーテルのシース内に備えられたプローブを回転させながら後端側へ後退させる範囲内に位置する。芯線中間細径部25の外周に形成した親水性被膜6が水を吸収して膨潤し、膜厚が増大しても水による光吸収が極めて少ない為、増大した膜厚分が加算されて暗色のバックシャドーが拡張することはない。そして、膨潤した親水性被膜6により動摩擦係数を低くして、摺動性を飛躍的に向上させる。【選択図】図3
