In the medical guide wire having a connection structure made up of three members connecting the tubular connection tool and the first core line and the second core member, for example, when the torsional rigidity of one member is lower than the torsional rigidity of the member at both ends, torsional settlement occurs between the respective members, and the rotation to the tip end side The permeability is greatly reduced. In this case, there is a technical problem to improve the rotational transmission to the tip sideAs a result of considering the torsional rigidity ratio between the respective members by considering the torsional rigidity of each member in consideration of the torsional rigidity of each member, it is possible to overcome the technical problem of improving the rotational transmission to the tip end by having a constant relationship of the torsional rigidity ratio.Diagram【課題】管状接続具と第1芯線と第2芯線とを接続した3つの部材から成る接続構造を有する医療用ガイドワイヤにおいて、例えば1つの部材のねじり剛性が両端部の部材のねじり剛性よりも低い場合には、各部材間でねじり溜まりが発生し、先端側への回転伝達性は大きく低下する。かかる場合に、先端側への回転伝達性を向上させる為の技術課題が存在している【解決手段】 3つの部材から成る接続構造において、各部材のねじり剛性に着目して、各部材間のねじり剛性比を考察した結果、ねじり剛性比が一定の関係を有することにより、先端側への回転伝達性を向上させる技術課題を克服することができる。【選択図】図1
