Lead

Abstract

An electrode catheter is provided with: a shaft (10) having a lumen (11) serving as a fluid passage; an irrigation member (20); and a distal end electrode (30). Irrigation openings (25A) for supplying liquid, which is supplied from the shaft (10), to the surface of the distal end electrode (30) are provided in the irrigation member (20) at equal angular intervals. The distal end of the irrigation member (20) has formed therein liquid guide grooves (26) respectively extending from the irrigation openings (25A) toward the distal end. The distal end electrode (30) has a spherical distal end section (31) including a maximum-diameter section (39) and also has a proximal end section (32). Liquid guide grooves (36) are formed in the surface of the distal end electrode (30), and the liquid guide grooves (36) respectively continue to the guide grooves (26) in the irrigation member (20) and extend toward the distal end until the liquid guide grooves (36) reach at least the maximum-diameter section (39). As a result, the electrode catheter is configured in such a manner that cauterization does not cause an abnormal temperature rise in a part of the distal end electrode, that the surface of the distal end electrode exhibits an excellent cooling effect and an excellent effect of preventing the formation of a thrombus, and that the electrode catheter can perform efficient cauterization treatment.

Description

technical field [0001] The present invention relates to an electrode catheter, and more specifically, to an electrode catheter having an electrode attached to a distal end of the catheter and a mechanism for perfusing the electrode with a liquid such as physiological saline. Background technique [0002] In the ablation catheter of the electrode catheter, a perfusion mechanism is used to cool the tip electrode, which becomes high temperature during cautery, and to stir and dilute the blood around the tip electrode to prevent thrombus from forming on the surface of the tip electrode. the catheter. [0003] As a conventional catheter equipped with a perfusion mechanism, a catheter of a type in which physiological saline supplied to the inside of the tip electrode through the catheter shaft is sprayed from a plurality of openings formed on the surface of the tip electrode is introduced (for example, refer to Patent Document 1 and Patent Document 1). 2). [0004] Patent Docume...

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Problems solved by technology

[0008] (2) Even if physiological saline is sprayed from the opening formed on the surface of the front electrode, the surface of the front electrode cannot be sufficiently perfused (covered with liquid), so the surface of the front electrode cannot be sufficiently cooled. In addition, Inability to adequately prevent or inhibit superficial thrombus formation

In particular, in the catheters described in Patent Document 1 and Patent Document 2 that inject physiological saline in a direction perpendicular to the axis of the distal electrode, since the physiological saline cannot sufficiently contact the surface of the distal electrode, cooling of the electrode surface effect and thrombosis inhibitory effect is extremely low

[0009] (3) Since a plurality of openings are formed on the surface of the electrode, the surface area of ​​the front electrode cannot be sufficiently ensured, and efficient ablation treatment cannot be performed

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