Electrode catheter

An electrode catheter comprising:

• a catheter main body;
• an operation handle connected to a base end side of the catheter main body;
• and
• a tip end portion connected to a tip end side of the catheter main body,
• wherein the tip end portion has:
• an outer tube with a plurality of electrodes being provided and spaced apart on an outer circumferential surface thereof;
• a coupling shaft with a plurality of pieces being coupled so that the pieces are able to mutually rotate within a predetermined range in a hollow space of the outer tube;
• a head member connected to a tip end of the coupling shaft;
• and
• a plurality of operation wires with one ends thereof being fixed to the head member and the other ends thereof being fixed to the operation handle,
• wherein the plurality of pieces are made by a synthetic resin, and the plurality of pieces each have;
• a rotation shaft that is provided on both surfaces of a central plate portion formed at a lower half portion of the respective piece in a longitudinal direction of the coupling shaft, and protrudes in a direction orthogonal to a short axis center of the coupling shaft;
• a shaft receiving hole that is provided on a pair of support arm portions formed at an upper half portion of the piece in the longitudinal direction of the coupling shaft, and axially supports the rotation shaft;
• and
• a through hole that is located at a position offset from the axis center, and
• an inclined surface is formed on the inner surface of the pair of support arm portions of respective piece, and the circumferential side surface of the rotation shaft is rounded in shape, and
• wherein one of the operation wires is inserted through the through hole, and the tip end portion is allowed to be curved by operating the operation wires via the operation handle.