Electrode catheter and method for manufacturing the same

摘要

An electrode catheter is provided with a catheter shaft (10), an operating handle (20) provided with a connector (70), a tip electrode (31), ring-shaped electrodes (32 to 34), lead wires (41 to 44) connected to the tip electrode (31) and the ring-shaped electrodes (32 to 34), respectively, and a pull wire (50) fixed to the tip electrode (31). The catheter shaft (10) is constituted of a shaft proximal end portion (11) formed of a metal tube having a spiral slit (115) formed in a tip portion, a shaft distal end portion (12) formed of a resin tube of multi-lumen structure, and a resin covering layer (13) covering outer peripheries of the shaft proximal end portion (11) and a rear end portion of the shaft distal end portion (12). The lead wires (41 to 44) and the pull wire (50) extend through different lumens of the resin tube constituting the shaft distal end portion (12). This electrode catheter can exhibit good kink resistance, torque transmissibility and pushability in the entire shaft.

主权项

1. An electrode catheter, comprising:
a catheter shaft; an operating handle connected to a base end side of the catheter shaft; a connector provided in the operating handle; a tip electrode attached to a tip of the catheter shaft; a lead wire having its tip connected to the tip electrode, extending along an axial direction inside the catheter shaft, and having its rear end connected to the connector; and a wire having its tip fixed to the tip electrode or a tip portion of the catheter shaft, extending along the axial direction inside the catheter shaft, and having its rear end fixed to the operating handle or a base end portion of the catheter shaft, wherein the catheter shaft comprises:
a shaft proximal end portion formed of a metal tube having a spiral slit formed at least in a tip portion;a shaft distal end portion formed of a resin tube having a multi-lumen structure coupled to the shaft proximal end portion by inserting a rear end region of its rear end portion into a tip region of the tip portion of the shaft proximal end portion; anda resin covering layer covering outer peripheries of the shaft proximal end portion and the rear end portion of the shaft distal end portion, and wherein the lead wire and the wire extend through different lumens of the shaft distal end portion, wherein a constituent resin of the shaft distal end portion flows into the slit of the shaft proximal end portion in a coupling portion to the shaft distal end portion, wherein the resin covering layer is formed by shrinking a heat-shrinkable resin tube into which the shaft proximal end portion and the rear end portion of the shaft distal end portion are inserted, and a melting point of a heat-shrinkable resin constituting the heat-shrinkable resin tube is higher than a melting point of the constituent resin of the shaft distal end portion, and wherein a width ratio (W1/W0) is 1.3 or more, where (W1) represents a width of the slit in the shaft proximal end portion in the coupling portion between the shaft proximal end portion and the shaft distal end portion, and (W0) represents a width of the slit of the shaft proximal end portion in a portion other than the coupling portion.