Guide sheath and medical system

A guide sheath which is configured to be guided by an internal introduction device and be inserted into a body, and which has a channel through which a medical device is capable of being inserted so as to guide a distal end of the medical device to a target area, the guide sheath comprising:

• an elongated member extending along a longitudinal axis;
• a first conduit line formed on a central axis of the elongated member;
• a pair of second conduit lines formed and disposed radially outside the first conduit line;
• a pair of manipulation wires disposed in the second conduit lines and extending along the longitudinal axis of the elongated member so as to be capable of advancing and retracting;
• and
• a bent section formed of a thermoplastic resin, the bent section being configured to be bent in accordance with advance or retraction of the manipulation wires, wherein
• the bent section includes portion walls formed at positions which are radially outside both the first conduit line and the second conduit lines and which are between an outer surface of the bent section and the second conduit lines,
• in the portion walls, soft sections having predetermined bending stiffness and hard sections formed to have bending stiffness larger than the soft sections by cross-linking the thermoplastic resin are alternately disposed along the longitudinal axis, and
• distal end sections of the manipulation wires are fixed to the hard sections.