JP5339630B2 - Electrode catheter - Google Patents

Abstract

The disclosed electrode catheter is provided with a catheter tube (11), a control handle, a tip connection member (12) and catheter tips (31-34). The tip connection member (12) is configured by integrating a tip holding part (122), in which are formed holding holes (131-134) that open at the convex surface of the tip and extend in the axial direction, and a cylindrical part, in which is formed an inner hole (135) that communicates with the holding holes in the axial direction. The bases of the catheter tips (31-34) are, while inserted into the holding holes (131-134), thermally fused to the tip holding part (122) of the tip connection member (12), and the cylindrical part (121) of the tip connection member (12) is, while inserted into the inner hole of the catheter tube (11), thermally fused to the catheter tube (11). Using this electrode catheter, a catheter tip of the appropriate shape (position) is firmly connected to the catheter tube and there is also little variation in the connection strength of each product.

Description

  The present invention relates to an electrode catheter having an electrode attached to the distal end portion of the catheter.

As a catheter for mapping electrical activity in the heart, a catheter having a looped catheter tip (mapping assembly 17) connected to the tip of a catheter tube is known (Patent Document 1). reference).
According to such a catheter, the potential of the inner peripheral portion of the blood vessel can be simultaneously measured in the radial direction.

Further, as another catheter for mapping the electrical activity in the heart, one having a plurality of catheter tip portions (projections 14) extending radially from the tip of the catheter tube is known (Patent Document 2). And Patent Document 3).
A tip electrode and a ring electrode are attached to each of the catheter tip portions in this catheter, and the potential of an in-circle region having the radius of the length of the catheter tip portion as a radius can be simultaneously measured with one catheter. it can.

JP 2001-245864 A Japanese Patent Laid-Open No. 2003-235821 JP 2004-130114 A

A catheter having a plurality of radially extending catheter tips can be used for various medical treatments in addition to the above mapping.
For example, it may be possible to confirm whether or not the intended cauterization has been performed after ablation treatment. Specifically, two electrodes (tip electrode or ring electrode) attached to each of different catheter tip portions are placed at symmetrical positions with the ablation line as an axis, and the potential transmission speed is measured. . Here, when cauterization is performed reliably, the potential transmission path between the two electrodes is interrupted by the ablation line, and the potential is bypassed and transmitted, so that the transmission speed is delayed. On the other hand, when cauterization is not performed reliably, the potential is transmitted between the two electrodes at the shortest distance, and therefore the transmission speed is not delayed.

By the way, when manufacturing the catheter of patent documents 1-3, it is necessary to connect a catheter front-end | tip part to the front-end | tip of a catheter tube.
As a method for connecting the distal end portion of the catheter, first, the proximal end portion of the distal end portion of the catheter is inserted into the inner hole of the catheter tube while the lead wire of the electrode attached to the distal end portion of the catheter is passed through the inner hole of the catheter tube. Next, by applying an adhesive so as to fill the gap between the catheter tube distal end opening edge and the proximal end portion of the catheter distal end inserted into the inner hole, and curing the adhesive (thermal curing or photocuring), The catheter tip is bonded and fixed to the tip of the catheter tube (see FIG. 3 of Patent Document 1, FIG. 2 of Patent Document 2, and FIG. 2 of Patent Document 3).

  However, when the catheter tip is connected to the tip of the catheter tube by the above method (adhesion step), there are the following problems.

(1) Sufficient adhesive strength cannot be obtained between the catheter tube and the catheter tip, and the adhesive (cured product) may fall off or the catheter tip may fall out from the inner hole of the catheter tube. Further, the adhesive strength tends to vary from product to product.
This may be due to the fact that there is a limit in strength with fixing with an adhesive, a sufficient bonding area cannot be secured, and the bonding operation is complicated and difficult to perform under uniform conditions. .

(2) Since the outer diameter of the catheter tip is smaller than the inner diameter of the catheter tube, for example, in the adhesive curing process, the catheter tip inserted into the inner hole of the catheter tube may be displaced, By tilting with respect to the axial direction, the distal end portion of the catheter extending from the distal end of the catheter tube may not have an appropriate shape (posture).
With respect to such a problem, in the catheters described in Patent Documents 2 to 3 having a plurality (five) of catheter tip portions, a position regulating member (non-conductive tube) having a pentagonal cross section is formed at the tip portion of the catheter tube. 42) is embedded to regulate the position of the catheter tip in the catheter tube, but the operation of embedding such a position regulating member and inserting the catheter tip along this is extremely complicated. It is.

(3) Since the outer diameter of the catheter tip is considerably smaller than the outer diameter of the catheter tube, a step (a portion where the outer diameter of the tube changes extremely) occurs at the connection position between the catheter tube and the catheter tip. Such a step causes the formation and adhesion of a thrombus during use of the catheter.
In response to such a problem, the degree of the level difference can be reduced by forming an adhesive layer having a convex curved surface by applying an excessive adhesive to the connection position of the catheter tip (tip of the catheter tube). Conceivable. However, it is not a good idea to use more adhesive than necessary because it increases the risk of dropping off the adhesive (cured product).

The present invention has been made based on the above situation.
A first object of the present invention is to provide an electrode catheter in which a catheter tip having an appropriate shape (posture) is firmly connected to a catheter tube and there is little variation in connection strength between products.
It is a second object of the present invention to provide an electrode catheter that does not risk the fall of the cured adhesive.
A third object of the present invention is to provide an electrode catheter that is difficult to form and adhere to a thrombus at the connection position of the distal end portion of the catheter during use.

(1) The electrode catheter of the present invention includes a catheter tube having at least one inner hole;
A control handle connected to the proximal end of the catheter tube;
A distal end connecting member made of a resin molded product connected to the distal end of the catheter tube and having a convex curved distal end surface;
At least one catheter tip connected to the tip of the tip linking member;
A plurality of ring-shaped electrodes mounted on the catheter tip;
The distal end connecting member is opened to a convex curved distal end surface, and has a distal end holding portion in which at least one holding hole for inserting and holding the proximal end portion of the catheter distal end is formed along the axial direction; A cylindrical portion in which an inner hole communicating with the holding hole is formed along the axial direction is integrally formed;
The proximal end portion of the distal end portion of the catheter is thermally fused to the distal end portion holding portion of the distal end portion connecting member in a state where the proximal end portion is inserted into the holding hole,
A cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube.

The proximal end portion of the distal end portion of the catheter is inserted into a holding hole formed in the distal end portion holding portion of the distal end portion connecting member, and is heat-sealed to the distal end portion holding portion. The tip end connecting member is firmly fixed.
Further, since the cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube, the distal end connecting member and the catheter tube are firmly fixed.
As a result, the distal end portion of the catheter and the catheter tube can be firmly coupled via the distal end portion coupling member.

  The fixing means between the catheter tip and the tip connecting member, and the fixing means between the tip connecting member and the catheter tube are all heat-sealed, and the catheter tip, tip connecting member, and catheter tube are fused and fixed. And are integrated, it is possible to ensure higher strength than fixing with an adhesive and there is no risk of the adhesive (cured product) falling off.

  In addition, the thermal fusion between the distal end portion of the catheter (base end portion) and the distal end portion connecting member (the distal end holding portion) is in a state where the proximal end portion of the catheter distal end portion is inserted into the holding hole (positioned by the holding hole). Therefore, the distal end portion of the catheter is not displaced or tilted with respect to the axial direction of the catheter tube. Thereby, the catheter front-end | tip part extended from the front end surface of a front-end | tip part connection member has an appropriate shape (attitude | position).

  Furthermore, the distal end surface of the distal end connecting member to which the distal end portion of the catheter is connected has a convex curved surface, so that a step that causes the formation and adhesion of a thrombus hardly occurs at the connection position of the distal end portion of the catheter.

(2) In the electrode catheter of the present invention, the distal end portion connecting member includes a distal end portion holding portion in which a plurality of holding holes opening in the convex curved distal end surface are formed along the axial direction;
A cylindrical portion in which an inner hole communicating with the holding hole is formed along the axial direction is integrally formed;
Each proximal end portion of the plurality of catheter distal end portions is thermally fused to the distal end holding portion of the distal end connecting member in a state inserted into each of the holding holes,
It is preferable that the cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube.

  The proximal end portions of the plurality of catheter distal end portions are thermally fused to the distal end holding portion of the distal end connecting member in a state where the proximal end portions are inserted into the plurality of holding holes. Can be fixed at an appropriate position.

(3) In the electrode catheter of the present invention, the distal end portion connecting member includes a distal end portion holding portion in which four holding holes opened in a convex curved end surface are formed along the axial direction;
A cylindrical portion in which an inner hole communicating with the holding hole is formed along the axial direction is integrally formed;
Each proximal end portion of the four catheter distal end portions is heat-sealed to the distal end holding portion of the distal end connecting member while being inserted into each of the holding holes,
It is preferable that the cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube.

  Each catheter distal end portion is thermally fused to the distal end holding portion of the distal end connecting member in a state where each proximal end portion of each of the four catheter distal end portions is inserted into each of the four holding holes. The part can be fixed at an appropriate position.

(4) In the electrode catheter of the present invention, the cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube (tube inner peripheral surface) in a state of being inserted into the inner hole of the catheter tube. It is preferable.

(5) In the electrode catheter of the present invention, the cylindrical portion of the distal end portion connecting member is the catheter tube (tube outer peripheral surface) in a state where the distal end portion of the catheter tube is inserted into the inner hole of the cylindrical portion. It is preferable to be heat-sealed.

(6) In the electrode catheter of the present invention, it is preferable that a distal end shape of the distal end portion connecting member is a convex rotating body shape.

(1) In the electrode catheter of the present invention, the distal end portion of the appropriate shape (posture) is firmly connected to the catheter tube, and there is little variation in connection strength between products.
(2) When using the electrode catheter of the present invention, there is no risk of the cured product of the adhesive falling off.
(3) When using the electrode catheter of the present invention, thrombus is unlikely to form or adhere to the connection position of the catheter tip.

It is a schematic front view of the electrode catheter which concerns on one Embodiment of this invention. It is a side view (II arrow view of FIG. 1) of the electrode catheter shown in FIG. It is sectional drawing in the front-end | tip part of the electrode catheter shown in FIG. 1 (II-II sectional drawing of FIG. 2). FIG. 3 is a cross-sectional view (III-III cross-sectional view of FIG. 2) at the distal end portion of the electrode catheter shown in FIG. 1. FIG. 4 is a cross-sectional view (IV-IV cross-sectional view of FIG. 1) at the distal end portion of the electrode catheter shown in FIG. 1. It is explanatory drawing which shows the front-end | tip part connection member which comprises the electrode catheter shown in FIG. 1, (1) is a perspective view, (2) is a front view, (3) is VV sectional drawing of (2). . It is the schematic which shows the use condition of the electrode catheter shown in FIG. It is a schematic front view of the electrode catheter which concerns on other embodiment of this invention. It is a side view (VI-VI arrow line view of FIG. 8) of the electrode catheter shown in FIG. It is sectional drawing in the front-end | tip part of the electrode catheter shown in FIG. 8 (VII-VII sectional drawing of FIG. 9). It is a schematic front view of the electrode catheter which concerns on other embodiment of this invention. It is a side view (VIII-VIII arrow line view of FIG. 11) of the electrode catheter shown in FIG. It is sectional drawing in the front-end | tip part of the electrode catheter shown in FIG. 11 (IX-IX sectional drawing of FIG. 12). It is sectional drawing in the front-end | tip part of the electrode catheter shown in FIG. 11 (XX sectional drawing of FIG. 12). It is sectional drawing in the front-end | tip part of the electrode catheter shown in FIG. 11 (XI-XI sectional drawing of FIG. 11). It is explanatory drawing which shows the front-end | tip part connection member which comprises the electrode catheter shown in FIG. 11, (1) is a perspective view, (2) is a front view, (3) is XII-XII sectional drawing of (2). .

<First Embodiment>
The electrode catheter 1 of this embodiment is used for diagnosis or treatment of arrhythmia in the heart, for example.
The electrode catheter 1 includes a catheter tube 11, a control handle 20 connected to the proximal end of the catheter tube 11, a distal end connecting member 12 having a convex curved distal end surface connected to the distal end of the catheter tube 11, Four catheter tips connected to the tip of the tip connector 12 (first catheter tip 31, second catheter tip 32, third catheter tip 33, fourth catheter tip 34) Tip electrodes 41a, 42a, 43a, 44a attached to each of the catheter tip portions, and eight ring electrodes 41B, 41c, 42b, 42C, 43b, two attached to each of the catheter tip portions. 43c, 44b and 44c. In FIG. 1, the length of the catheter tube 11 is shown short, but actually, it is several times to several tens of times longer than the length of the control handle 20 in the Z-axis direction.

  The catheter tube 11 has at least one inner hole (lumen). A lead wire (not shown) connected to the tip electrode and the ring electrode and a pulling wire (shown by 51 and 52 in FIG. 4) constituting a deflection mechanism of the catheter tip are passed through the lumen of the catheter tube 11. Yes.

  The catheter tube 11 may be made of a material having the same characteristics along the axial direction, but is preferably formed integrally using materials having different rigidity (hardness) along the axial direction. Specifically, it is preferable that the constituent material on the proximal end side has relatively high rigidity, and the constituent material on the distal end side has relatively low rigidity.

  The catheter tube 11 is made of a synthetic resin such as polyolefin, polyamide, polyether polyamide, polyurethane, nylon, or PEBAX (polyether block amide). The proximal end side of the catheter tube 11 may be a blade tube obtained by braiding these synthetic resin tubes with stainless steel wires.

The outer diameter of the catheter tube 11 is preferably 1.0 to 3.0 mm, and more preferably 1.6 to 2.7 mm.
The length of the catheter tube 11 is preferably 600 to 1500 mm, more preferably 900 to 1200 mm.

The electrode catheter 1 of this embodiment is characterized in that each of the catheter tip portions 31, 32, 33, and 34 is connected to the catheter tube 11 via the tip portion connecting member 12.
As shown in FIG. 6, the tip end connecting member 12 is made of a resin molded product in which a tip end holding portion 122 and a cylindrical portion 121 are integrally molded. In FIG. 6, reference numeral 123 denotes a retaining prevention portion formed on the cylindrical portion 121.
In the distal end holding portion 122 of the distal end connecting member 12, four holding holes 131, 132, 133, 134 that open to the convex curved distal end surface are formed along the axial direction.
On the other hand, an inner hole 135 communicating with the holding holes 131, 132, 133, 134 is formed in the cylindrical portion 121 along the axial direction.

The distal end surface of the distal end portion connecting member 12 has a convex curved surface shape, and the distal end shape of the distal end portion connecting member 12 is preferably a convex rotating body shape so that the distal end surface has a convex curved surface shape.
Examples of the “convex rotating body shape” include a hemispherical shape, a semi-rotating elliptical shape, a bullet shape, a conical shape, and a truncated cone shape.

  The resin constituting the distal end connecting member 12 is not particularly limited as long as it can be fused to the catheter tube 11 and the distal end of the catheter. For example, PEBAX that is the same material as the catheter tube 11 is preferable. It is.

It is preferable that the outer diameter of the distal end connecting member 12 (the distal end holding portion 122) is the same as the outer diameter of the catheter tube 11 so that a step does not occur in the connecting portion of the distal end connecting member 12.
The length of the tip holding portion 122 is preferably 2 to 60 mm, and more preferably 5 to 10 mm.
The inner diameter of the holding hole formed in the tip holding portion 122 of the tip connecting member 12 is adjusted as appropriate according to the outer diameter of the catheter tip inserted and held therein.

The outer diameter of the cylindrical portion 121 of the distal end connecting member 12 is smaller than the outer diameter of the distal end holding portion 122 and is appropriately adjusted according to the inner diameter of the catheter tube 11 into which the cylindrical portion 121 is inserted.
The length of the cylindrical portion 121 is preferably 1 to 10 mm, and more preferably 2 to 5 mm.

  The control handle 20 is connected to the proximal end of the catheter tube 11. In FIG. 1, 21 is a gripping portion, and 22 is a rotating plate constituting a deflection mechanism that bends the distal end portion of the catheter tube 11.

The electrode catheter 1 of this embodiment includes four catheter tip portions (a first catheter tip portion 31, a second catheter tip portion 32, and a third catheter tip portion) that extend while bending outward in the radial direction of the axis of the catheter tube 11. Part 33 and a fourth catheter tip 34).
As shown in FIG. 2, the four catheter tip portions 31, 32, 33, 34 are radially spaced from the tip of the tip connecting member 12 at substantially equal angles (about 90 ° in a side view shown in FIG. 2). It extends to.

The outer diameter of the catheter tip is preferably 0.3 to 1.4 mm, more preferably 0.5 to 1.0 mm.
The outer diameter of the distal end portion of the catheter is preferably 0.15 to 0.4 times the outer diameter of the catheter tube 11 and the distal end portion connecting member 12.
Thus, when the outer diameter of the catheter distal end is considerably smaller than the outer diameter of the catheter tube and a step is produced when directly connected, the distal end connecting member having a convex curved surface at the distal end surface is formed. It is effective to intervene 12.
The length of the distal end portion of the catheter (the portion extending from the distal end surface of the distal end connecting member 12) is preferably 5 to 50 mm, and more preferably 10 to 30 mm.

  As shown in FIGS. 3 and 5, the catheter tip portions 31, 32, 33, 34 are composed of elongated plate-like core members 311, 321, 331, 341 and covered tubes 312, 322, 332, 342. ing.

As shown in FIG. 3, the core member 311 constituting the first catheter tip 31 extends along the inner hole of the covering tube 312 and the tip is fixed in a state of being embedded in the tip electrode 41a. .
Further, the core member 331 constituting the third catheter distal end portion 33 extends along the inner hole of the covering tube 332, and the distal end portion is fixed in a state of being embedded in the distal end electrode 43a.
Note that the second catheter tip 32 and the fourth catheter tip 34 also have the same structure as the first catheter tip 31 and the third catheter tip 33.

The core member stores the shape of the distal end portion of the catheter, and is deformed (for example, deformed linearly) by applying force. However, when the force is removed, the stored shape (as shown in FIGS. 1 to 4) is stored. Return to the unfolded shape.
Examples of the constituent material of the core member include Ni-Ti alloys. The ratio of Ni and Ti in the Ni—Ti alloy is preferably 54:46 to 57:43. Nitinol can be mentioned as a preferred Ni-Ti alloy.
Examples of the constituent material of the coated tube include a bio-acceptable resin material such as polyurethane or PEBAX.

  As shown in FIGS. 3 and 5, in the electrode catheter 1 of this embodiment, the proximal end portions of the four catheter distal end portions 31, 32, 33, 34 are the distal end holding portions of the distal end connecting member 12, respectively. 122, and inserted into the four holding holes 131, 132, 133, and 134, and the proximal end portion of the distal end portion of the catheter is inserted into the holding hole, the covered tubes 312, 322, 332, 342 and the tip holding portion 122 of the tip connecting member 12 are heat-sealed. Thereby, each of the four catheter tip portions 31, 32, 33, and 34 and the tip portion connecting member 12 are firmly fixed.

As shown in FIGS. 3 and 4, the cylindrical portion 121 of the distal end connecting member 12 is heat-sealed to the catheter tube 11 while being inserted into the lumen of the catheter tube 11 ( The outer peripheral surface of the cylindrical portion 121 and the inner peripheral surface of the catheter tube 11 are heat-sealed). Thereby, the front-end | tip part connection member 12 and the catheter tube 11 are firmly fixed.
As a result, each of the catheter distal end portions 31, 32, 33, and 34 can be firmly coupled to the catheter tube 11 via the distal end coupling member 12.

  The fixing means between the catheter tip portions 31, 32, 33, and 34 and the tip connecting member 12 and the fixing means between the tip connecting member 12 and the catheter tube 11 are all heat-sealed, and an adhesive is used. It is possible to ensure a higher strength than that of fixing by means of, and there is no risk that the cured product of the adhesive will fall off.

In addition, heat fusion between the proximal end portion of the distal end portion of the catheter and the distal end holding portion 122 of the distal end connecting member 12 is such that the proximal end portions of the catheter distal end portions 31, 32, 33, 34 are held in the holding holes 131, 132, 133, and 134 are inserted (positioned by the holding holes), so that the catheter tip portions 31, 32, 33, and 34 are displaced, or the catheter tube 11 is axially displaced. Will not tilt. Thereby, the catheter distal end portions 31, 32, 33, and 34 extending from the distal end surface of the distal end connecting member 12 have an appropriate shape (posture).
In addition, since the proximal end portion of the distal end portion of the catheter is thermally fused while being inserted into the holding hole, a sufficient fusion area can be secured.

  Furthermore, since the distal end surface of the distal end connecting member 12 to which the catheter distal end portions 31, 32, 33, 34 are connected is a convex curved surface, a thrombus is formed at the connection position of the catheter distal end portions 31, 32, 33, 34.・ Steps that cause adhesion are not formed.

On the catheter tip (first catheter tip 31, second catheter tip 32, third catheter tip 33, fourth catheter tip 34), tip electrodes 41a, 42a, 43a, 44a are respectively provided. And two ring-shaped electrodes 41B and 41c, 42b and 42C, 43b and 43c, and 44b and 44c, respectively.
Conductive wires (not shown) connected to the tip electrode and the ring electrode are insulated from each other, with the inner hole of the catheter tip (covered tube), the holding hole and the inner hole of the tip connecting member 12 and the catheter tube. 11 lumens have been passed.

  The tip electrode and the ring electrode are made of a metal having good electrical conductivity such as aluminum, copper, stainless steel, gold, platinum, iridium, or an alloy thereof. The outer diameters of the tip electrode and the ring-shaped electrode are not particularly limited, but are preferably approximately the same as the outer diameter of the catheter tip.

As shown in FIG. 2, among the eight ring-shaped electrodes 41B and 41c, 42b and 42C, 43b and 43c, and 44b and 44c that constitute the electrode catheter 1, the ring shape that is attached to the distal end portion 31 of the first catheter The electrode 41B and the ring-shaped electrode 42C attached to the second catheter tip 32 have an electrode width (length in the tube axis direction) longer than the electrode width of the other ring-shaped electrodes. Is 1.5 to 2.0 times.
Here, the electrode width of the ring electrodes other than the ring electrode 41B and the ring electrode 42C is preferably 0.5 to 4.0 mm, and more preferably 0.6 to 1.2 mm.

According to the electrode catheter 1 having such a configuration, by finding the ring-shaped electrode 41B having a wide electrode width among the ring-shaped electrodes 41B, 42b, 43b, and 44b that are first from the distal end side on the X-ray image. It can be recognized that the distal end portion of the catheter to which the ring-shaped electrode 41B is attached is the first distal end portion 31 of the catheter.
If the first catheter tip 31 can be recognized on the X-ray image, the tip electrode and the ring electrode attached to the first catheter tip 31 are recognized as the tip electrode 41a and the ring electrodes 41B and 41c, respectively. Can do.

Further, by finding the ring-shaped electrode 42C having a wide electrode width among the ring-shaped electrodes 41c, 42C, 43c, and 44c that are second from the tip side on the X-ray image, the ring-shaped electrode 42C is attached. It can be recognized that the catheter tip portion is the second catheter tip portion 32.
If the second catheter tip 32 can be recognized on the X-ray image, the tip electrode and the ring electrode attached thereto are recognized as the tip electrode 42a and the ring electrodes 42b and 42C, respectively. Can do.

In addition, if the first catheter tip 31 and the second catheter tip 32 can be recognized on the X-ray image, they are next to the second catheter tip 32 (opposite to the first catheter tip 31). The catheter tip can be recognized as the third catheter tip 33.
If the third catheter tip 33 can be recognized on the X-ray image, the tip electrode and the ring electrode attached thereto are recognized as the tip electrode 43a and the ring electrodes 43b and 43c, respectively. Can do.

In addition, if the first catheter tip 31, the second catheter tip 32, and the third catheter tip 33 can be recognized on the X-ray image, they are next to the third catheter tip 33 (the third catheter tip 33). The catheter tip (between the catheter tip 33 and the first catheter tip 31) can be recognized as the fourth catheter tip 34.
If the fourth catheter tip 34 can be recognized on the X-ray image, the tip electrode and the ring-shaped electrode attached thereto are recognized as the tip electrode 44a and the ring-shaped electrodes 44b and 44c, respectively. Can do.

As a result, it is possible to easily grasp which catheter tip is attached to all the tip electrodes 41a, 42a, 43a, 44a on the X-ray image.
In addition, regarding all the ring electrodes 41B and 41c, 42b and 42C, 43b and 43c, and 44b and 44c on the X-ray image, it is determined at which arrangement position at which catheter tip portion. It can be easily grasped.

  In the electrode catheter 1 of this embodiment, two ring-shaped electrodes (ring-shaped electrode 41B and ring-shaped electrode 42C) having a wider electrode width than other ring-shaped electrodes are adjacent to the distal end of the catheter (first distal end of the catheter). 31 and the second catheter tip 32) are mounted at different positions.

When there is one ring-shaped electrode having a wide electrode width, for example, when only the electrode width of the ring-shaped electrode 41B is wide, the second catheter tip 32 and the fourth catheter tip on the X-ray image. 34 cannot be immediately identified. For example, the tip electrode 42a displayed on the X image may be mistaken for the tip electrode 44a.
In such a case, for example, when the tip electrode 43a attached to the third catheter tip 33 and the tip electrode 42a attached to the second catheter tip 32 are placed across the ablation line. In addition, the tip electrode 42a on the X image is mistaken as the tip electrode 44a, and is displayed on the monitor based on the potential data between the tip electrode 43a and the tip electrode 44a that does not cross the ablation line. It may be misdiagnosed as "no shochu".

  On the other hand, in the electrode catheter 1 of this embodiment, in addition to the electrode width of the ring-shaped electrode 41B, the electrode width of the ring-shaped electrode 42C attached to the second catheter distal end portion 32 is also wide. The second catheter tip 32 and the fourth catheter tip 34 can be immediately identified, and there is no possibility of misidentifying the tip electrode 42a projected on the X-ray image as the tip electrode 44a. It is possible to reliably avoid misdiagnosis.

In addition, when two ring electrodes having a wider electrode width than the other ring electrodes are mounted at the same position in each of the adjacent catheter tip portions, the ring shape having a wider electrode width in the X-ray image. It is not possible to distinguish whether each of the two catheter tips attached with the electrodes is the first catheter tip or the second catheter tip.
In such a case, it is impossible to immediately recognize whether the four catheter distal ends on the X-ray image are viewed from the distal end side of the catheter or viewed from the proximal end side of the catheter.

  On the other hand, in the electrode catheter 1 of this embodiment, the arrangement position of the ring electrode 41B attached to the first catheter tip 31 (first from the tip side as a ring electrode) and the second catheter tip Since the mounting position of the ring-shaped electrode 42C mounted on the portion 32 (second ring-shaped electrode from the distal end side) is different from each other, the first catheter distal end portion 31 and the second catheter distal end portion 32 are securely connected to each other. Can be identified. Thereby, it is possible to immediately recognize whether the four catheter distal ends on the X-ray image are viewed from the distal end side of the catheter or viewed from the proximal end side of the catheter.

The electrode catheter 1 of this embodiment includes a deflection mechanism (swing mechanism) that bends the distal end portion of the catheter tube 11.
The deflection mechanism is not particularly limited. For example, a leaf spring (not shown) housed in the distal end portion of the catheter tube 11 and the lumen of the catheter tube 11 on the front and back sides of the leaf spring are provided. Mention may be made of a mechanism comprising two pulling wires (indicated by 51 and 52 in FIG. 4) to be drawn and a rotating plate 22 to which the proximal ends of the two pulling wires are connected. .
Here, each of the distal ends of the two tension wires may be fixed to the inner wall of the catheter tube 11 at a position opposed to each other with the leaf spring interposed therebetween, and the front and back surfaces of the flat plate portion at the distal end of the leaf spring. It may be fixed to.

On the other hand, the proximal ends of the pull wires 51 and 52 are connected to positions separated from each other on the rotary plate 22 of the control handle 20, and the rotary plate 22 is centered on a rotary axis perpendicular to the Z axis shown in FIG. And can be rotated freely.
The operator holds the grip portion 21 of the control handle 20 with one hand, and operates (rotates in a predetermined direction) the rotating plate 22 with the finger of the one hand. Thereby, the tension | tensile_strength of the pulling wires 51 and 52 changes, and the front-end | tip part of the catheter tube 11 bends in the direction shown by the arrow A or arrow B of FIG.

  That is, for example, when the rotating plate 22 is rotated in the A1 direction shown in FIG. 1, the pulling wire 52 is pulled and the pulling wire 51 is loosened. As a result, as shown in FIG. 1, the distal end portion of the catheter tube 11 is bent in the direction of arrow A, and the distal end portion of the catheter is deflected.

Similarly, when the rotating plate 22 is rotated in the B1 direction shown in FIG. 1, for example, the pulling wire 51 is pulled and the pulling wire 52 is loosened. As a result, as shown in FIG. 1, the distal end portion of the catheter tube 11 is bent in the direction of arrow B and the distal end portion of the catheter is deflected.
When the control handle 20 is rotated about the Z axis shown in FIG. 1, the direction of the A direction or the B direction with respect to the control handle 20 can be freely set while being inserted into the heart chamber.

  If an example of the usage method of the electrode catheter 1 of this embodiment is shown, the target site | part in a heart cavity will be shown first in the state inserted in the cylindrical sheath (The state where four catheter tip parts were linearly deformed). The electrode catheter 1 is moved to the vicinity of the catheter, and the four catheter tip portions are pushed out of the sheath in the vicinity of the target site to restore the memory shape of the catheter tip portion (deployed shape as shown in FIGS. 1 to 4). Let

Next, as shown in FIG. 7 (1), the distal end portion of the catheter tube 11 is bent, and the distal electrode 42a attached to the second catheter distal end portion 32 and the third catheter distal end portion 33 are attached. The tip electrode 43a is placed so that the ablation line AL is positioned at the intermediate point between them.
In this manner, by placing the two ring-shaped electrodes attached to the adjacent catheter distal end portions, the remaining two ring-shaped electrodes, that is, the distal electrode 41a attached to the first catheter distal end portion 31 are provided. In addition, the distal electrode 44a attached to the fourth catheter distal end portion 34 can also be placed so that the ablation line AL is positioned at an intermediate point between them. As a result, the four tip electrodes 41a, 42a, 43a, 44a can be arranged at the same distance from the ablation line AL.
After placement in this manner, electrical stimulation is applied from one of the tip electrodes (pacing), and potential measurement is performed on the other tip electrode, and the transmission speed (time at which the potential is detected) is compared, thereby ablation. The line AL can be evaluated.
It is also possible to place another electrode catheter around the catheter body 10, apply electrical stimulation from the other electrode catheter (pacing), measure the potential at each tip electrode, and compare the transmission speed. is there.

By arranging the four tip electrodes equidistant from the ablation line AL, if the intended cauterization is made along the ablation line AL, the tip electrode 41a and the tip electrode 41a The potential transmission speed between the tip electrodes 44a (potential transmission speed between electrodes across the ablation line AL) is the potential between the tip electrode 42a and the tip electrode 41a and between the tip electrode 43a and the tip electrode 44a. It becomes slower than the transmission speed (the transmission speed of the potential between the electrodes not straddling the ablation line AL).
If uniform cauterization is performed along the ablation line AL, the transmission speed of the potential between the tip electrode 42a and the tip electrode 43a is equal to the transmission speed of the potential between the tip electrode 41a and the tip electrode 44a. Become.

  Note that the ablation line AL shown in FIG. 7 (1) does not appear on the X-ray image, but is usually grasped by the operator.

  As described above, according to the electrode catheter 1 of this embodiment in which the number of catheter tip portions is four, it is easy to arrange corresponding four electrodes (for example, tip electrodes) at an equal distance from the ablation line AL. Can be done.

  According to the electrode catheter 1 of this embodiment, whether the electrode of the X-ray image and the distal end portion of the catheter to which the electrode is mounted are viewed from the distal end side of the catheter or viewed from the proximal end side of the catheter. It can be recognized immediately.

In the X-ray image in the state as shown in FIG. 7 (1), by finding the ring electrode 41B having the first wide electrode width from the front end side, this ring electrode 41B is mounted. Can be recognized as the first catheter tip 31.
Further, by finding the ring-shaped electrode 42C having the second wide electrode width from the distal end side, the catheter distal end portion on the upper left side of the drawing, to which the ring-shaped electrode 42C is attached, is the second catheter distal end portion. It can be recognized as 32.
7 (1), the first catheter tip 31, the second catheter tip 32, the third catheter tip 33, and the fourth catheter tip 34 are arranged “clockwise”. Therefore, this X-ray image can be immediately recognized as the catheter tip viewed from the proximal end side of the catheter.

On the other hand, in the X-ray image in the state as shown in FIG. 7 (2), at first glance, it looks the same as in FIG. 7 (1), but paying attention to the electrode width of the ring electrode, By recognizing the ring-shaped electrode 41B having a large electrode width, the catheter tip on the lower right side of the drawing, to which the ring-shaped electrode 41B is attached, is recognized as the first catheter tip 31. Can do.
In addition, by finding the ring-shaped electrode 42C having the second wide electrode width from the distal end side, the catheter distal end portion on the upper right side of the drawing, to which the ring-shaped electrode 42C is attached, is the second catheter distal end portion. It can be recognized as 32.
7 (2), the first catheter tip 31, the second catheter tip 32, the third catheter tip 33, and the fourth catheter tip 34 are arranged “counterclockwise”. Therefore, this X-ray image can be immediately recognized as the catheter tip viewed from the tip of the catheter.

<Second Embodiment>
The electrode catheter 2 of this embodiment includes a catheter tube 16, a control handle 25 connected to the proximal end of the catheter tube 16, and a distal end connecting member having a convex curved distal end surface connected to the distal end of the catheter tube 16. 17, a looped catheter tip 35 connected to the tip of the tip connecting member 17, a tip electrode 46 attached to the catheter tip 35, and ten ring electrodes attached to the catheter tip 35 47.

  The catheter tube 16 has at least one inner hole (lumen), and this lumen constitutes a lead wire (not shown) connected to the tip electrode 46 and the ring electrode 47, respectively, and a deflection mechanism for the catheter tip portion 35. A puller wire (shown as 55 in FIG. 10) is threaded.

  The specific configuration (material, outer diameter, length) of the catheter tube 16 is the same as that of the catheter tube 11 constituting the electrode catheter 1 of the first embodiment.

As shown in FIG. 10, the tip end connecting member 17 is formed of a resin molded product in which a tip end holding portion 172 and a cylindrical portion 171 are integrally formed.
A holding hole 182 that opens to the tip surface of the convex curved surface is formed in the tip holding portion 172 of the tip connecting member 17 along the axial direction.
On the other hand, an inner hole 181 communicating with the holding hole 182 is formed in the cylindrical portion 171 along the axial direction.

  The resin constituting the distal end connecting member 17 is not particularly limited as long as it can be fused to the catheter tube 16 and the catheter distal end, and for example, PEBAX is suitable.

The outer diameter of the distal end connecting member 17 (the distal end holding portion 172) is preferably the same as the outer diameter of the catheter tube 16.
Moreover, it is preferable that the length of the front-end | tip part connection member 17 (front-end | tip part holding part 172) is 2-60 mm, More preferably, you may be 5-10 mm.

The outer diameter of the cylindrical portion 171 of the distal end connecting member 17 is appropriately adjusted according to the inner diameter of the catheter tube 16 into which it is inserted.
The inner diameter of the holding hole 182 formed in the tip holding portion 172 of the tip connecting member 17 is appropriately adjusted according to the outer diameter of the catheter tip 35 inserted and held therein.

  The control handle 25 is connected to the proximal end of the catheter tube 16. In FIG. 8, 26 is a gripping portion, and 27 is a knob for performing an operation of bending the distal end portion of the catheter tube 11 (deflecting the catheter distal end portion 35).

  The electrode catheter 2 of this embodiment includes a catheter tip 35 formed in a loop shape.

The outer diameter of the catheter tip 35 is preferably 0.6 to 2.0 mm.
The outer diameter of the distal end portion of the catheter is preferably 0.2 to 0.7 times the outer diameter of the catheter tube 16 and the distal end portion connecting member 17.

As shown in FIG. 10, the catheter distal end portion 35 includes a core member 351 and a covering tube 352.
The core member 351 extends along the inner hole of the covering tube 352, and the distal end portion of the core member 351 is fixed in a state of being embedded in the distal electrode 46.

The core member 351 stores the shape of the distal end portion of the catheter and is deformed (for example, linearly deformed) by applying a force, but returns to the stored shape when the force is removed.
An example of the constituent material of the core member 351 is a Ni—Ti alloy. The ratio of Ni and Ti in the Ni—Ti alloy is preferably 54:46 to 57:43. Nitinol can be mentioned as a preferred Ni-Ti alloy.
Examples of the constituent material of the covering tube 352 include a bio-acceptable resin material such as polyurethane or PEBAX.

  As shown in FIG. 10, in the electrode catheter 2 of this embodiment, the proximal end portion of the catheter distal end portion 35 is inserted into the holding hole 182 formed in the distal end holding portion 172 of the distal end connecting member 17, and the distal end of the catheter With the proximal end portion of the portion 35 inserted into the holding hole 182, the covering tube 352 at the proximal end portion and the distal end holding portion 172 of the distal end connecting member 17 are heat-sealed. Thereby, the catheter front-end | tip part 35 and the front-end | tip part connection member 12 are firmly fixed.

Further, the cylindrical portion 171 of the distal end connecting member 17 is heat-sealed to the catheter tube 16 while being inserted into the lumen of the catheter tube 16. Thereby, the front-end | tip part connection member 17 and the catheter tube 16 are firmly fixed.
As a result, the catheter tip 35 and the catheter tube 16 can be firmly connected via the tip connecting member 17.

  The fixing means between the catheter distal end portion 35 and the distal end connecting member 17 and the fixing means between the distal end connecting member 17 and the catheter tube 16 are both heat-sealed, and have higher strength than the fixing by the adhesive. In addition, there is no risk of the cured product of the adhesive falling off.

Further, the heat fusion between the proximal end portion of the catheter distal end portion 35 and the distal end holding portion 172 of the distal end connecting member 17 is a state where the proximal end portion of the catheter distal end portion 35 is inserted into the holding hole 182 (holding). Therefore, the catheter tip 35 is not displaced or tilted with respect to the axial direction of the catheter tube 16. Thereby, the catheter distal end portion 35 extending from the distal end surface of the distal end portion connecting member 17 has an appropriate shape (posture).
In addition, since the proximal end portion of the catheter distal end portion 35 is heat-sealed while being inserted into the holding hole 182, a sufficient fusion area can be secured.

  Further, since the distal end surface of the distal end connecting member 17 to which the catheter distal end portion 35 is connected is a convex curved surface, a step that causes formation and adhesion of a thrombus is formed at the connection position of the catheter distal end portion 35. Not.

<Third Embodiment>
The electrode catheter 3 according to this embodiment includes a catheter tube 11, a control handle 20 connected to the proximal end of the catheter tube 11, and a distal end connecting member having a convex curved distal end surface connected to the distal end of the catheter tube 11. 14 and four catheter tips connected to the tip of the tip linking member 14 (first catheter tip 31, second catheter tip 32, third catheter tip 33, fourth catheter tip 34), tip electrodes 41a, 42a, 43a, 44a attached to each of the catheter tip portions, and eight ring electrodes 41B, 41c, 42b, 42C attached to each of the catheter tip portions. , 43b · 43c, 44b · 44c.

The electrode catheter 3 has the same configuration as that of the electrode catheter 1 according to the first embodiment except that the form and connection mode of the distal end connecting member are different.
11-15 which show the electrode catheter 3, the same code | symbol is used for the component same as 1st Embodiment.

In the electrode catheter 3 of this embodiment, each of the catheter distal end portions 31, 32, 33, and 34 is connected to the catheter tube 11 via the distal end connecting member 14.
As shown in FIG. 16, the tip end connecting member 14 is formed of a resin molded product in which a tip end holding portion 142 and a cylindrical portion 141 are integrally formed.
Four holding holes 151, 152, 153, 154 are formed in the tip holding portion 142 of the tip connecting member 14 along the axial direction so as to open to the tip of the convex curved surface.
On the other hand, an inner hole 155 communicating with the holding holes 151, 152, 153, 154 is formed in the cylindrical portion 141 along the axial direction.

The distal end surface of the distal end portion connecting member 14 has a convex curved surface shape, and the distal end shape of the distal end portion connecting member 14 is preferably a convex rotating body shape so that the distal end surface has a convex curved surface shape.
The tip holding portion 142 and the cylindrical portion 141 of the tip connecting member 14 have the same outer diameter. Therefore, although it is difficult to distinguish in appearance, the portion having the holding hole inside is the tip portion holding portion 142 and the portion having the inner hole 155 inside is the cylindrical portion 141. is there.

  As shown in FIGS. 13 and 15, in the electrode catheter 3 of this embodiment, the proximal end portions of the four catheter distal end portions 31, 32, 33, and 34 are the distal end holding portions of the distal end connecting member 14, respectively. 142, inserted into the four holding holes 151, 152, 153, 154 formed in 142, and in the state where the proximal end portion of the catheter distal end portion is inserted into the holding hole, the covered tubes 312, 322, 332, 342 and the tip holding portion 142 of the tip connecting member 14 are heat-sealed. Thereby, each of the four catheter tip portions 31, 32, 33, and 34 and the tip portion connecting member 14 are firmly fixed.

As shown in FIGS. 13 and 14, the cylindrical portion 141 of the distal end connecting member 14 is heated to the catheter tube 11 in a state where the distal end portion of the catheter tube 11 is inserted into the inner hole 155 thereof. Fused (the inner peripheral surface of the cylindrical portion 141 and the outer peripheral surface of the catheter tube 11 are heat-sealed).
Thereby, the front-end | tip part connection member 14 and the catheter tube 11 are firmly fixed.
As a result, each of the catheter distal end portions 31, 32, 33, and 34 can be firmly coupled to the catheter tube 11 via the distal end coupling member 14.

In the electrode catheter 3 of this embodiment, the outer diameter of the distal end connecting member 14 (the distal end holding portion 142 and the cylindrical portion 141) is set so that no step is generated in the connecting portion of the distal end connecting member 14. The outer diameter is preferably substantially the same.
The length of the tip holding portion 142 is preferably 2 to 60 mm, and more preferably 5 to 10 mm.
The inner diameter of the holding hole formed in the tip holding portion 142 is appropriately adjusted according to the outer diameter of the catheter tip inserted and held therein.

The inner diameter (the diameter of the inner hole 155) of the cylindrical portion 141 is appropriately adjusted according to the outer diameter of the catheter tube 11 inserted therein.
In addition, in the catheter tube 11 inserted in the inner hole 155 of the cylindrical part 141, you may process so that the outer diameter of a front-end | tip may become smaller than the outer diameter of another part.

The length of the cylindrical portion 141 is preferably 1 to 20 mm, and more preferably 3 to 7 mm.
The cylindrical portion 141 of the distal end connecting member 14 constituting the electrode catheter 3 of this embodiment is set longer than the cylindrical portion 121 of the distal end connecting member 12 constituting the electrode catheter 1 of the first embodiment. Can do.
That is, in the electrode catheter 1 of the first embodiment, the length of the cylindrical portion 121 of the distal end connecting member 12 is in contact with the distal ends of the pulling wires 51 and 52 that are passed through the lumen of the catheter tube 11. However, in the electrode catheter 3 according to this embodiment, since the catheter tube 11 is inserted into the inner hole 155 of the cylindrical portion 141 of the distal end connecting member 14, Even if the length-like portion 141 is set to be long, it does not come into contact with the distal ends of the pulling wires 51 and 52 drawn through the lumen of the catheter tube 11. By setting the length longer than that of the cylindrical portion 121, a heat-sealing area between the cylindrical portion 141 and the catheter tube 11 can be increased, and the distal end connecting member 14 and the catheter tube 11 are more firmly fixed. In addition, since the distal ends of the pulling wires 51 and 52 can be extended to the tip of the catheter tube 11, the operability (swinging operation) of the electrode catheter can be improved.

  In the electrode catheter 3 of this embodiment, the fixing means for the catheter tip portions 31, 32, 33, 34 and the tip connecting member 14 and the fixing means for the tip connecting member 14 and the catheter tube 11 are all heat. It is a fusion, can ensure a higher strength than the fixing with an adhesive, and there is no risk of the cured product of the adhesive falling off.

In addition, heat fusion between the proximal end portion of the distal end portion of the catheter and the distal end portion holding portion 142 of the distal end portion connecting member 14 is performed so that the proximal end portions of the catheter distal end portions 31, 32, 33, and 34 152, 153, and 154 are inserted (positioned by the holding holes), the catheter tip portions 31, 32, 33, and 34 are displaced, or the catheter tube 11 is axially displaced. Will not tilt. Thereby, the catheter distal end portions 31, 32, 33, and 34 extending from the distal end surface of the distal end connecting member 12 have an appropriate shape (posture).
In addition, since the proximal end portion of the distal end portion of the catheter is thermally fused while being inserted into the holding hole, a sufficient fusion area can be secured.

  Further, since the distal end surface of the distal end connecting member 14 to which the catheter distal end portions 31, 32, 33, 34 are connected is a convex curved surface, a thrombus is formed at the connection position of the catheter distal end portions 31, 32, 33, 34.・ Steps that cause adhesion are not formed.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible.

For example, in the form having a plurality of catheter tip portions, the number of ring-shaped electrodes attached to each of the catheter tip portions is not limited to two, and may be three or more. Moreover, the electrode width may be the same in all ring-shaped electrodes.
Furthermore, the shape of the catheter tip is not particularly limited.

  The electrode catheter of the present invention can be used not only for confirmation after ablation treatment but also for various diagnoses or treatments. For example, since the electric potential in the in-circle region having the radius of the length of the distal end portion of the catheter can be measured simultaneously, it can be suitably used as a mapping catheter.

DESCRIPTION OF SYMBOLS 1 Electrode catheter 11 Catheter tube 12 Tip part connection member 121 Cylindrical part 122 Tip part holding part 123 Retaining prevention part 131,132,133,134 Holding hole 135 Inner hole 20 Control handle 21 Gripping part 22 Rotating plate 31 1st plate Catheter tip portion 32 Second catheter tip portion 33 Third catheter tip portion 34 Fourth catheter tip portion 311, 321, 331, 341 Core member 312, 322, 332, 342 Covered tube 41 a Tip electrode 41 B / 41 c Ring shape Electrode 42a Tip electrode 42b / 42C Ring electrode 43a Tip electrode 43b / 43c Ring electrode 44a Tip electrode 44b / 44c Ring electrode 2 Electrode catheter 16 Catheter tube 17 Tip connecting member 171 Cylindrical portion 172 Tip holding Minute 181 Inner hole 182 Holding hole 25 Control handle 26 Gripping part 27 Knob 35 Catheter tip 351 Core member 352 Covered tube 46 Tip electrode 47 Ring electrode 55 Tension wire 3 Electrode catheter 14 Tip part connecting member 141 Cylindrical part 142 Tip part Holding portion 151, 152, 153, 154 Holding hole 155 Inner hole

Claims (6)

A catheter tube having at least one inner bore;
A control handle connected to the proximal end of the catheter tube;
A distal end connecting member made of a resin molded product connected to the distal end of the catheter tube and having a convex curved distal end surface;
At least one catheter tip connected to the tip of the tip linking member;
A plurality of ring-shaped electrodes mounted on the catheter tip;
The distal end connecting member is opened to a convex curved distal end surface, and has a distal end holding portion in which at least one holding hole for inserting and holding the proximal end portion of the catheter distal end is formed along the axial direction; A cylindrical portion in which an inner hole communicating with the holding hole is formed along the axial direction is integrally formed;
The proximal end portion of the distal end portion of the catheter is thermally fused to the distal end portion holding portion of the distal end portion connecting member in a state where the proximal end portion is inserted into the holding hole,
An electrode catheter, wherein a cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube. The tip portion connecting member includes a tip portion holding portion in which a plurality of holding holes that are open in a convex curved tip surface are formed along the axial direction;
A cylindrical portion in which an inner hole communicating with the holding hole is formed along the axial direction is integrally formed;
Each proximal end portion of the plurality of catheter distal end portions is thermally fused to the distal end holding portion of the distal end connecting member in a state inserted into each of the holding holes,
The electrode catheter according to claim 1, wherein the cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube. The tip portion connecting member has a tip portion holding portion in which four holding holes that are open in a convex curved tip surface are formed along the axial direction;
A cylindrical portion in which an inner hole communicating with the holding hole is formed along the axial direction is integrally formed;
Each proximal end portion of the four catheter distal end portions is heat-sealed to the distal end holding portion of the distal end connecting member while being inserted into each of the holding holes,
The electrode catheter according to claim 1, wherein the cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube.   4. The cylindrical portion of the distal end connecting member is heat-sealed to the catheter tube in a state of being inserted into the inner hole of the catheter tube. The electrode catheter as described.   The cylindrical portion of the distal end portion connecting member is heat-sealed to the catheter tube in a state where the distal end portion of the catheter tube is inserted into an inner hole of the cylindrical portion. The electrode catheter according to any one of claims 1 to 3.   The electrode catheter according to any one of claims 1 to 5, wherein a distal end shape of the distal end portion connecting member is a convex rotating body shape.

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