To provide a method for easily inserting a rod-shaped core material into a guide wire lumen of a balloon catheter in which a balloon is covered with a protective tube.SOLUTION: Provided is a method for inserting a rod-shaped core material into a guide wire lumen 5 of a balloon catheter 1 in which a balloon is covered with a protective tube 2, in which a needle-like instrument 11 is inserted into a space formed by the protective tube 2 and the distal portion of the balloon catheter 1, the distal end of the balloon catheter 1 is brought into contact with the inner wall of the protective tube 2, and the rod-shaped core material is inserted into the guide wire lumen 5 in the contact state.SELECTED DRAWING: Figure 2a【課題】簡易に、バルーンに保護管が被さったバルーンカテーテルのガイドワイヤールーメンに棒状芯材を挿入する方法を提供する。【解決手段】バルーンに保護管２が被さったバルーンカテーテル１のガイドワイヤールーメン５に、棒状芯材を挿入する方法であって、保護管２とバルーンカテーテル１の遠位部がなす空間にニードル状器具１１を挿入し、バルーンカテーテル１の遠位端を保護管２の内壁に接触させ、接触させた状態で棒状芯材をガイドワイヤールーメン５に挿入する。【選択図】図２ａ
