PROBLEM TO BE SOLVED: To provide a catheter tube capable of easily obtaining a desired gradient of hardness, reducing a sudden change of hardness in a hardness changing part, with excellent push-in property and the kink resistance applicable to various kinds of catheters such as a micro-catheter.SOLUTION: The catheter tube comprises an inner layer 1 made of fluororesin and an outer layer which covers the inner layer. The outer layer comprises at least two layers: a first outer layer 3 with at least two kinds of resin with different hardness in the longitudinal direction of the catheter tube and a second outer layer 4 covering the first outer layer with at least two kinds of resin with different hardness in the longitudinal direction of the catheter tube. The joint part 5 of the two resin parts with different hardness in the first outer layer is not juxtaposed with the joint part 6 of the two resin parts with different hardness in the second outer layer in the longitudinal direction.COPYRIGHT: (C)2008,JPO&INPIT【課題】所望の硬度傾斜を容易に得ることができ、且つ硬度変化部での急激な硬度変化が低減され、マイクロカテーテルをはじめとした種々カテーテルに適用できる押込み性、耐キンク性に優れたカテーテルチューブを提供する。【解決手段】フッ素系樹脂からなる内層1と、当該内層を覆う外層とを含むカテーテルチューブであって、前記外層は、硬度の異なる少なくとも2つの樹脂を前記カテーテルチューブの長手方向にかけて備える第1外層3、および硬度の異なる少なくとも2つの樹脂を前記カテーテルチューブの長手方向にかけて備える、前記第1外層を覆う第2外層4の少なくとも2層を有し、前記第1外層における硬度の異なる2つの樹脂の接合部5と前記第2外層における硬度の異なる2つの樹脂の接合部6とが前記長手方向にかけて並列しない位置にある。【選択図】図1
