Method for manufacturing medical instrument, and medical instrument

A medical instrument, comprising:

• a tubular body having an outer layer and a main lumen;
• a hollow tube comprising a material different from the outer layer of the tubular body and embedded in the outer layer of the tubular body such that the hollow tube has an outer surface directly joined to the outer layer of the tubular body and is positioned on an outer peripheral side of the main lumen and demarcating a sublumen;
• and
• an operating wire inserted in the sub lumen of the hollow tube such that the operating wire bends a distal end portion of the tubular body when operated at a proximal end portion of the operating wire,
• wherein the hollow tube has an inner surface continuously extending in a longitudinal direction of the hollow tube and one of a plurality of recesses and a combination of a plurality of protrusions and the plurality of recesses formed on the inner surface such that at least one of the plurality of protrusions and the plurality of recesses is extending on at least one side of the inner surface in the longitudinal direction of the hollow tube and formed apart from each other along the longitudinal direction of the hollow tube and that each of the plurality of protrusions and/or the plurality of recesses does not extend over a total length of the hollow tube, and the hollow tube is formed with the plurality of recesses such that each of the plurality of recesses has a width having a length orthogonal to a depth direction and a longitudinal direction of the plurality of recesses and that the width of each of the plurality of recesses is set smaller than a diameter of the operating wire.