Lead

Abstract

An electrode catheter is provided wherein: a catheter shaft (10) having an eccentrically-formed lumen (11) serving as a path for fluid, an irrigation member (20), and a tip electrode (30) are provided; a plurality of irrigation holes (25A) are provided to the irrigation member (20) at equiangular intervals to the irrigation member (20); an eccentric path (23) that connects with the lumen (11) of the shaft (10), a storage space (24) for liquid that connects to the eccentric path (23) and has no partition walls in the peripheral direction, and a plurality of branching paths (25) that connect with the storage space (24), extend in the tip direction while inclining toward the outside, and arrive at each of the irrigation holes (25A) formed on the inner section of the irrigation member (20); the irrigation member (20) comprises a first part (21) and a second part (22); the eccentric path (23) is formed on the inner section of the second part (22); the branching paths (25) are formed on the inner section of the first part (21); and the storage space (24) is formed in the portion where the first part (21) and the second part (22) fit together. This electrode catheter makes it possible to uniformly irrigate the surface of the tip electrode (30) in the peripheral direction using liquid supplied from the lumen of the eccentrically-formed shaft (10).

Description

technical field [0001] The present invention relates to an electrode catheter. More specifically, it relates to an electrode catheter equipped with an electrode at a distal end of the catheter and a mechanism for perfusing the electrode with a liquid such as physiological saline. Background technique [0002] As an ablation catheter as an electrode catheter, a catheter equipped with an irrigation mechanism for cooling a distal electrode that becomes high temperature during cauterization is used. [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 distal electrode through the catheter shaft is sprayed from a plurality of openings formed on the surface of the distal electrode is introduced (for example, refer to Patent Document 1 and Patent Document 1). 2). [0004] However, conventionally known catheters in which an opening for irrigation is formed on the surface of the dist...

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Problems solved by technology

In addition, when cauterization is performed with such a sharp-edged tip electrode, the current density at the sharp-edged portion becomes extremely high, causing an abnormal temperature rise in this portion, and there is a possibility that a thrombus may be rapidly formed.

[0006] (2) Even if physiological saline is injected from the opening formed on the surface of the front electrode, the surface of the front electrode cannot be sufficiently perfused (covering the surface with liquid)

In particular, in the catheters described in Patent Document 1 and Patent Document 2, which inject physiological saline in a direction perpendicular to the axis of the distal electrode, the physiological saline cannot be brought into sufficient contact with the surface of the distal electrode.

[0007] (3) By forming a plurality of openings on the electrode surface, the surface area of ​​the front electrode cannot be sufficiently ensured, and effective ablation treatment cannot be performed

[0020] However, in order to increase the number of ejection openings (outlets of the flow path), it is unrealistic to increase the number of flow paths formed in the tip electrode or the irrigation member, and further increase the number of lumens forming flow paths in the catheter shaft. of

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