Medical shaft, medical device, and method for manufacturing medical shaft

A method for manufacturing a medical shaft comprising a shaft including at least one lumen extending in a longitudinal direction,

• a core member disposed in the lumen, the core member extending along the longitudinal direction, and a tubular member disposed between the shaft and the core member in a same lumen as a lumen in which the core member is disposed, the tubular member having a length, in the longitudinal direction, which is shorter than a length of the core member, the method comprising the steps of:
• forming an opening through which the lumen and a portion outside the shaft are connected;
• disposing, in the lumen of the shaft, the core member on which the tubular member is not disposed;
• disposing the core member inside the tubular member;
• disposing the tubular member in the lumen of the shaft;
• and then
• heating the tubular member so that the tubular member is adhered to the core member and a circumferential wall of the lumen of the shaft, wherein the opening is closed by the heating, and
• wherein the steps are performed in the order as recited.