The mandrel, proximal large diameter barrel division and reduction diameter/includes the taper part, and the mandrel itself which possesses distal (2036) small diameter barrel division. The said taper part can connect the said distal (2036) small diameter barrel division with the said proximal large diameter barrel division. The said proximal large diameter barrel division has large diameter, the said distal (2036) small diameter barrel division has the small diameter which is smaller than large diameter. The said small diameter is smaller than diameter of the inside lumen of coaxial catheter, the said large diameter exceeds the inside diameter of the guide wire exit port of the outer part lumen of the said coaxial catheter, the said taper part is the size which forms the fluid seal in inside diameter of the guide wire exit port of the outer part lumen. The distal (2036) small diameter barrel division of the said mandrel, it closes the said catheter, seals substantially, it prevents the flow to the guide wire entrance port of the distal (2036) edge which at the same time passes this.マンドレルは、近位の大径バレル区分、縮径/テーパ部分、および遠位の小径バレル区分を有するマンドレル本体を含む。該テーパ部分は該近位の大径バレル区分と該遠位の小径バレル区分をつなげる。該近位の大径バレル区分は大径を有し、該遠位の小径バレル区分は大径よりも小さい小径を有する。該小径は同軸カテーテルの内側ルーメンの径よりも小さく、該大径は該同軸カテーテルの外側ルーメンのガイドワイヤ出口ポートの内径を上回り、該テーパ部分は外側ルーメンのガイドワイヤ出口ポートの内径に流体シールを形成する大きさである。該マンドレルの遠位の小径バレル区分は、該カテーテルを塞ぎ、実質的にシールし、かつこれを通過する遠位端のガイドワイヤ入口ポートへの流れを防ぐ。
