Method of bonding operation wire and medical equipment

A medical equipment comprising:

• a coupling material having a through-hole;
• an operation wire having an end portion inserted into the through-hole of the coupling material;
• and
• a bonding material provided between the coupling material and the operation wire to bond the coupling material and the operation wire, wherein the operation wire includes:
• a bonding region on which the bonding material is arranged to bond the coupling material and the operation wire, and
• a wet-spreading preventing region for the bonding material, the wet-spreading preventing region:
• being adjacent to the bonding region,
• being formed from oxide, and
• being a region on which the bonding material is not arranged,
• wherein the wet-spreading preventing region of the operation wire is positioned outside the coupling material, and
• the bonding material has a cone shape extending from an end of the coupling material to the wet-spreading preventing region.