KR101300884B1 - Catheter having deflectable leading end - Google Patents

Abstract

The present invention can firmly connect and fix the operation wire to the leaf spring, regardless of the material of the leaf spring and the material of the control wire, so that the wire does not detach from the surface of the leaf spring during use. An object of the present invention is to provide a tip deflection operable catheter.
In order to solve the above problems, the tip deflection operable catheter includes a catheter tube 4, a tip chip electrode 10 fixed to a distal end of the catheter tube 4, and a catheter tube 4. It is disposed in the distal end side along the axial direction, and is arranged to extend along the axial direction in the inside of the catheter tube 4 and the shaking plate spring 20 for deformation in the bending direction. The operation wire 30 of the proximal end can be tension-operated and the one side 201 and / or the other side 202 of the distal end 203 of the leaf spring 20 of the operation wire 30. A ring-shaped member 40 for caulking the distal end portion 303 is provided.

Description

Catheter having deflectable leading end

The present invention relates to a distal end operable catheter, and more particularly, to a distal end of a catheter inserted into a body cavity by operating an operation part of the proximal end side disposed outside the body. A tip deflection operable catheter capable of changing the direction of vi).

For example, in an electrode catheter or the like inserted through the arterial vessel to the inside of the heart, the distal end (fixed end of the tip chip electrode) of the catheter inserted into the heart is oriented in the proximal end (rear end or There is a need to operate (change) the operating part mounted on the right side).

Conventionally, the mechanism shown in following patent document 1 is known as a mechanism for deflecting by operating the distal end of a catheter directly to the side.

In the mechanism shown in this patent document 1, the leaf spring (plate-shaped lead spring) is arrange | positioned inside the distal end part of a flexible catheter, and the circle | round | yen of an operation wire is provided on one surface and / or other surface of the distal end part of the leaf spring. The upper end is connected and fixed. Then, by tensioning the proximal end of the operation wire, the leaf spring can be bent to change the direction of the distal end of the catheter.

Here, solder is usually used for the connection fixing of the distal end of the wire for operation to one side and / or the other side of the leaf spring.

However, when solder is used to secure the connection of the operation wire to one side and / or the other side of the leaf spring, the constituent material of the leaf spring (for example, stainless steel and Ni-Ti alloy) and the constituent material of the operation wire ( For example, stainless steel) is poor in wettability with solder, so that the wire for operation cannot be connected and fixed with sufficient strength to one side and / or the other side of the leaf spring, and during use of the electrode catheter shown in Patent Document 1, The operation wire may detach from the surface of the leaf spring.

Moreover, in the electrode catheter shown by patent document 1, the tip chip electrode fixed to the distal end of a catheter is only connected and fixed (fixed) at two places of the distal end of a catheter tube and the distal end of a leaf spring.

Here, connection fixing between the distal end of the tip chip electrode and the catheter tube is usually performed by an adhesive, but the adhesive force may decrease due to deterioration of the adhesive over time.

In addition, although solder is usually used for the connection fixing between the tip chip electrode and the leaf spring, the constituent material of the leaf spring (stainless steel exhibiting good springability, Ni-Ti alloy) has poor wettability with the solder. Connection is difficult.

For this reason, it is not possible to connect and fix the tip chip electrode with sufficient fixing force with respect to the distal end of the catheter, and there exists a possibility that the tip chip electrode may fall in vivo during use of an electrode force catheter. Recovery of the tip chip electrode dropped into the living body is difficult, so that the tip chip electrode is required not to fall off from the distal end of the catheter tube.

With respect to such a problem, the applicant connects the distal end of the leaf spring (head shaking member) to the distal tip electrode, and independently of the connection portion of the distal end of the leaf spring, the circle of the operation wire is connected to the distal tip electrode. A tip deflection operable catheter with an upper end connected is proposed (see Patent Document 2 below).

It is sectional drawing which shows the inside of the distal end side of the catheter of patent document 2. FIG.

As shown in the figure, inside the distal end of the catheter tube 104, the leaf spring 120 as a shaking member is arrange | positioned, and the distal end of the leaf spring 120 is the tip chip electrode 110. As shown in FIG. It is connected and fixed to the tip chip electrode 110 by the solder 150 which is filled in the inside. A notch is formed at the distal end of the leaf spring 120, and a protective tube for temperature sensor 140 is disposed inside the notch. The proximal end of the leaf spring 120 is connected and fixed to the distal end of the coil tube 124 inside the catheter tube 104. In the figure, reference numeral 112 is a ring-shaped electrode attached to the distal end of the catheter tube 104, 122 is a reinforcing plate connected to one side of the leaf spring (120).

130 is a pair of operation wires for bending deformation of the leaf spring 120 in the direction of the arrow A or the direction of the arrow B. The large diameter portion for preventing the fall is respectively disposed at the distal end of the operation wire 130 ( Fall prevention part (130a) is formed. The distal ends of these operation wires 130 are disposed apart from the plate springs 120 at both positions by sandwiching the leaf springs 120 inside the solder 150, and are soldered by the large diameter portion 130a for preventing release. It is prevented with respect to 150.

The proximal end side of the operation wire 130 is inserted freely in the axial direction inside the operation tube 132. The proximal end of the operation wire 130 is connected to a handle for performing deflection movement operation (head shaking operation) of the distal end portion of the catheter tube 104, and by operating the handle, one of the operation wire 130 ), The leaf spring 120 is bent, and the distal end of the catheter can be deflected with arrows A or B.

In the catheter having the above-described configuration, the tip chip electrode 110 is not only connected and fixed to the distal end of the catheter tube 104 and the distal end of the leaf spring 120 but also a pair of Since the distal end of the operation wire 130 is also fixed to the distal end, if the distal end of the distal end of the tip chip electrode 110 and the catheter tube 104 is separated, or the tip chip electrode 110 and the leaf spring are separated. Even when the distal end of the 120 is disconnected, the tip chip electrode 110 is connected to the distal end of the pair of operation wires 130, thereby preventing the tip chip electrode 110 from falling off. can do.

Japanese Patent No. 3232308 Japanese Patent Publication No. 2006-61350

However, in the catheter described in Patent Literature 2, since the distal end of the operation wire is fixed to the tip chip electrode independently of the connecting portion of the distal end of the leaf spring (away from the distal end of the leaf spring), When performing the tensioning operation of the working wire, there is a fear that the distal end of the operation wire is pulled out (the connection with the tip chip electrode is separated) from the solder filled inside the tip chip electrode. That is, even if the large diameter portion for the fall prevention is formed, the contact area with the solder at the distal end of the operation wire is small compared with the contact area at the distal end of the leaf spring, and the operation wire is made with the solder. When it becomes a material with poor wettability (for example, stainless steel), it is thought that it will fall by comparatively low tensile force.

The present invention has been made based on the above circumstances.

The first object of the present invention is to securely connect and fix the operation wire with respect to the leaf spring, irrespective of the constituent material of the leaf spring and the constituent material of the wire for operation. An object of the present invention is to provide a tip deflection operable catheter in which no wire is detached.

The second object of the present invention is to prevent falling of the tip chip electrode fixed to the distal end of the catheter, and to prevent the dropping of the tip chip electrode from the solder charged inside the tip chip electrode when the tensioning operation wire is performed. A tip deflection operable catheter capable of preventing the distal end of the action wire from being pulled out.

It is a third object of the present invention to provide a tip deflection operable catheter having excellent manufacturing efficiency as compared with the conventional one.

In order to achieve the above object, the tip deflection operable catheter of the present invention,

Catheter tube,

A tip chip electrode fixed to the distal end of the catheter tube;

A leaf swinging leaf spring disposed along the axial direction inside the distal end side (near the distal end) of the catheter tube and deformable in the bending direction;

An operation wire disposed in the catheter tube so as to extend in an axial direction, the proximal end of which is tension-operated;

And a ring-shaped member for caulking the distal end of the operation wire on one surface and / or the other surface of the distal end of the leaf spring.

According to such a structure, since the distal end of the operation wire is fixed to one surface and / or the other surface at the distal end of the leaf spring, regardless of the constituent material of the leaf spring and the constituent material of the operation wire, The operation wire can be firmly connected and fixed to the leaf spring.

In the tip deflection operable catheter of the present invention, the distal end portion of the leaf spring and the operation wire, which are caulked by the ring-shaped member, the tip chip by solder filled in the tip chip electrode. It is preferable that it is connected and fixed to an electrode.

According to such a structure, the distal end of a leaf spring, the distal end of an operation wire, and the ring-shaped member caulking and fixing this contact with the solder filled in the tip chip electrode (it is embedded). Therefore, in addition to the distal end of the catheter tube and the distal end portion of the leaf spring, the tip chip electrode fixed to the distal end of the catheter tube, the operation wire fixed to the distal end of the leaf spring by a ring-shaped member Connection resistance is also fixed (fixed) to the distal end of the plate, and the drawing resistance from the solder of the leaf spring and the operating wire (fixing of the tip chip electrode) is increased due to the increase in the contact area with the solder by embedding the ring-shaped member. Force) is increased. Therefore, the detachment of the tip chip electrode from the catheter tube can be reliably prevented.

In addition, the distal end of the operation wire is fixed to one surface and / or the other surface of the distal end of the leaf spring by a ring-shaped member (the distal end of the leaf spring, the distal end of the operation wire, and the ring-shaped member Is in contact with the solder, so that the distal end of the leaf spring and the ring-shaped member act as prevention of pulling out (drawing resistance) with respect to the force to draw the operation wire. This makes it possible to reliably prevent the distal end of the operation wire from falling out of the solder charged inside the tip chip electrode when performing the tension operation of the operation wire.

In the tip deflection operable catheter of the present invention, one end and the other end of the operation wire are proximal ends, and the inside of the catheter tube is extended from the one end (proximal end) to the distal direction and the one surface of the leaf spring. It passes through the side, folds and overlaps at the distal end of the leaf spring, passes through the other surface side of the leaf spring, and extends in the proximal direction to the other end (proximal end), and becomes the distal end of the leaf spring. It is preferable that the distal end of the said operation wire is caulking fixed on both surfaces of one side and the other surface of an end part.

According to such a structure, since the leaf spring can be deflected to one surface side and the other surface side by the strand of wire which becomes a distal end of the overlap, the direction of the distal end of the catheter can be changed in both directions. It can reduce and manufacture becomes easy.

In the distal end operable catheter of the present invention having such a configuration, it is preferable that a notching or through hole for guiding the overlapping of the operation wire is formed at the distal end of the leaf spring.

In the distal end operable catheter of the present invention, the operation wire has a proximal end thereof, extends the inside of the catheter tube in a distal direction, and the other end thereof is a wire which becomes a distal end, and the leaf spring In one side or the other side of the distal end of the terminal, the distal end of the operation wire may be caulked.

According to such a structure, the strand of wire can be deflected to one surface side or the other surface side by one strand of the operation wire, and the direction of the distal end of a catheter can be changed to one direction.

In addition, by preparing two strands of such a wire for operation and caulking and fixing these distal ends to one surface or the other surface of the distal end portion of the leaf spring, the leaf springs are connected to one surface side and the other surface side by two wires. By bending in both directions, the distal end of the catheter can be changed in both directions.

In the tip deflection operable catheter of the present invention having the above-described configuration, a sleeve for preventing release is attached to the distal end of the operation wire, and an inner diameter of the sleeve is provided at the distal end of the operation wire. A large diameter portion having a diameter larger than) is formed, and the proximal end surface of the sleeve abuts against the distal end surface of the ring-shaped member, thereby restricting the movement of the sleeve in the proximal direction along one surface or the other surface of the leaf spring. It is preferable that the operation wire moves to the proximal direction of the inside of the sleeve by contacting the large diameter portion of the distal end of the operation wire with the distal end surface of the sleeve.

According to such a configuration, it is possible to reliably prevent the operation wire from moving in the proximal direction along one surface or the other surface of the leaf spring (extracting the operation wire fixed to the caulking).

In the tip deflection operable catheter of the present invention, the ring-shaped member is preferably made of copper or a copper alloy.

According to the ring-shaped member made of copper or a copper alloy, when caulking the distal end of the operation wire to one side and / or the other side of the distal end of the leaf spring, the fixing operation can be easily performed.

Moreover, copper and a copper alloy have good wettability with solder, and caulking by the ring-shaped member which consists of copper or a copper alloy improves the connection strength of a ring-shaped member and a tip chip electrode, and further eliminates the tip chip electrode fall. It can certainly be prevented.

According to the distal end operable catheter of the present invention (claim 1), since the distal end of the operation wire is fixed to the one side and / or the other side of the distal end of the leaf spring by the ring-shaped member, Regardless of the constituent material and the constituent material of the operative wire, the operative wire can be firmly connected and fixed with respect to the leaf spring, and the operative wire is not released from the surface of the leaf spring during use.

In addition, according to the tip deflection operable catheter of the present invention (claim 2), it is possible to prevent the tip chip electrode from falling off, and at the same time, from the solder charged inside the tip chip electrode when tensioning the operation wire is performed. It is possible to reliably prevent the distal end of the operation wire from falling out.

Further, the inside of the catheter tube is extended from one end (proximal end) to the distal direction, passes through one surface side of the leaf spring, folds up at the distal end of the leaf spring, passes through the other surface side of the leaf spring, and proximate to the proximal direction. The present invention (Claim 3) comprising a wire for operation that extends to the other end (proximal end) and becomes a strand of wire, and the distal end of the wire for operation is fixed on one side and the other side of the distal end of the leaf spring. According to the tip deflection operable catheter, the plate spring can be deflected in both directions on one side and the other side by one strand of the operation wire, so that the number of parts can be reduced, compared with the conventional one. Manufacturing efficiency is also excellent.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the electrode catheter which is one Embodiment of the tip deflection operable catheter of this invention.
FIG. 2 is a partially broken front view of the distal end side of the electrode catheter shown in FIG. 1. FIG.
3 is a partially broken plan view of the distal end side of the electrode catheter shown in FIG. 1.
4 is a cross-sectional view II of FIG. 2.
It is a top view which shows the shape of the leaf spring which comprises the electrode catheter shown in FIG.
It is a partially broken front view of the distal end side of the electrode catheter which is another embodiment of this invention.
7 is a partially broken plan view of the distal end side of an electrode catheter according to another embodiment of the present invention.
It is a partially broken front view of the distal end side of the electrode catheter which is another embodiment of this invention.
9 is a partially broken plan view of the distal end side of an electrode catheter according to another embodiment of the present invention.
10 is a cross-sectional view showing the interior of a distal end side of a conventional electrode catheter.

First Embodiment

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated based on embodiment shown in drawing.

The electrode catheter 2 of this embodiment shown in FIG. 1 is used for the diagnosis or treatment of arrhythmia in a heart, for example.

1, 4 is a catheter tube, 10 is a tip chip electrode fixed at the distal end of the catheter tube 4, 12 is a ring-shaped electrode mounted at the distal end of the catheter tube 4, 6 is a catheter tube 4 The connector (handle), 7 attached to the proximal end of the head) is a handle for attaching the connector 6 to perform a deflection movement operation (head shaking operation) of the distal end of the catheter tube 4. From the connector 6, the conducting wire (not shown) electrically connected to each of the tip chip electrode 10 and the ring-shaped electrode 12 is taken out.

2 to 4, the electrode catheter 2 of the present embodiment includes a catheter tube 4, a tip chip electrode 10 fixed to a distal end of the catheter tube 4, and a catheter tube ( 4 (2) ring-shaped electrodes 12 attached to the distal end of 4), plate spring 20 disposed inside the distal end side (near the distal end) of the catheter tube 4, the catheter tube The operation wire 30 arranged on the inside of the (4) so as to extend along the axial direction, and the operation wire on one surface 201 and the other surface 202 of the distal end portion 203 of the leaf spring 20. A ring-shaped member 40 for caulking the distal end portion 303 of 30 is provided.

The catheter tube 4 is comprised by the hollow tube member. Although the catheter tube 4 may be comprised with the tube of the same characteristic along an axial direction, it is integrally formed in the axial direction with respect to the distal end part which is comparatively flexible, and the distal end part, and is comparatively compared with the distal end part. It is preferred to have a rigid proximal end portion.

As a constituent material of the catheter tube 4, synthetic resins, such as a polyolefin, a polyamide, a polyether polyamide, and a polyurethane, are mentioned, for example.

The outer diameter of the catheter tube 4 is generally about 0.6-3 mm, and the inner diameter is about 0.5-2.5 mm. A conductive wire (not shown) connected to each of the tip chip electrode 10 and the ring-shaped electrode 12 is insulated and passed through the axial lumen of the catheter tube 4, respectively.

The tip chip electrode 10 fixed to the distal end of the catheter tube 4 is formed by integrally forming a shell-shaped tip portion 101 and a cylindrical portion 102 continuous thereto. The part 102 is inserted into its inner hole from the distal end of the catheter tube 4 and is fixed by an adhesive agent.

Examples of the constituent material of the tip chip electrode 10 include metals having good thermal conductivity, such as aluminum, copper, stainless steel, gold, and platinum. In addition, in order to provide favorable contrast to X-rays, the tip chip electrode 10 is preferably made of platinum or the like.

Although the outer diameter of the tip chip electrode 10 is not specifically limited, It is preferable that it is about the same as the outer diameter of the catheter tube 4, and it is about 0.6-3 mm normally.

Examples of the constituent material of the ring-shaped electrode 12 attached to the distal end of the catheter tube 4 include the same metals as those exemplified as the constituent material of the tip chip electrode 10.

Although the outer diameter of the ring-shaped electrode 12 is not specifically limited, It is preferable that it is about the same as the outer diameter of the catheter tube 4, and it is about 0.6-3 mm normally.

In addition, the number of ring-shaped electrodes attached to the distal end of the catheter tube 4 is, of course, not limited to two.

The leaf spring 20 disposed inside the distal end side of the catheter tube 4 is a hill swing member that can be deformed in the bending direction.

As also shown in FIG. 5 (1), the notch 20C for guiding the folding of an operation wire is formed in the distal end part 203 of the leaf spring 20. As shown in FIG. In addition, as shown in FIG. 5 (2), it is also possible to use the leaf spring 20 'in which the through-hole 20P is formed instead of the notch. The axial length L of the leaf spring 20 is not specifically limited, For example, it is 40-300 mm. The width W of the leaf spring 20 will not be specifically limited if it is a grade accommodated in the inside of the catheter tube 4.

The material of the leaf spring 20 is not specifically limited, For example, metal materials, such as stainless steel, a Ni-Ti alloy, and a Co-Ni alloy, polymer materials, such as a fluororesin and a polyamide resin, etc. are mentioned.

In the electrode catheter 2 of the present embodiment, caulking is employed as the connection fixing means of the wire 30 for operation to the leaf spring 20, and solder is not used as in the prior art. As the constituent material, a metal material (for example, stainless steel or Ni-Ti alloy) having poor wettability with solder can be used, and even a polymer material having low heat resistance as compared with the metal material can be used.

The proximal end of the leaf spring 20 is connected to and fixed to the catheter tube 4 or to the distal end of a coil tube (not shown) which receives a reaction force of tensile force acting on the operation wire 30. It is fixed.

As for the operation wire 30 extended along the axial direction inside the catheter tube 4, the proximal end is arrange | positioned so that tension operation is possible.

One end and the other end of the operation wire 30 become the proximal end, and the inside of the catheter tube 4 is extended from one end (proximal end) to the distal direction (upward in FIGS. 2 and 3), and the leaf spring ( It passes through the one side 201 side of 20 and is guided and overlapped by the notch formed in the distal end 203 of the leaf spring 20 (thus, the overlapping part becomes the distal end of the operation wire 30). After passing through the other surface 202 side of the leaf spring 20, it extends in the proximal direction (downward) and becomes one strand of wire reaching the other end (proximal end).

One end and the other end which are the proximal end of the operation wire 30 are connected to the handle 7 for performing deflection movement operation (head shaking operation) of the distal end of the catheter tube 4.

The operation wire 30 may be made of a metal such as stainless steel or a Ni-Ti superelastic alloy, but is not necessarily made of a metal. For example, the operation wire 30 may be made of a high strength non-conductive wire. You may comprise. By configuring the operation wire with the non-conductive wire, the cause of the high frequency noise can be reduced.

The ring-shaped member 40 is for caulking the distal end portion 303 of the operation wire 30 to one surface 201 and the other surface 202 of the distal end portion 203 of the leaf spring 20. .

Thereby, with respect to the one surface 201 and the other surface 202 in the distal end 203 of the leaf spring 20, the distal end 303 (part before and after the overlapping) of the operation wire 30 is removed. I can fix it firmly.

Since caulking is used as the connection fixing means of the wire 30 for operation to the leaf spring 20 (one surface 201 and the other surface 202), and no solder is used, it is a constituent material of the wire 30 for operation. It becomes possible to use a thing with low wettability with solder.

As a constituent material of the ring-shaped member 40, it can select suitably from the metal which can carry out caulking process (connection fixation of the operation wire 30 with respect to the leaf spring 20) easily.

In addition, as described later, the distal end portion 203 of the leaf spring 20 caulked and fixed by the ring-shaped member 40 and the distal end portion 303 of the operation wire 30 are the tip chip electrode 10. The constituent material of the ring-shaped member 40 is a metal material having good wettability to solder in order to be connected to the tip chip electrode 10 by the solder 50 filled in the inside (inside recess) of the metal. It is preferable. From such a viewpoint, copper or a copper alloy is mentioned as a preferable structural material of the ring-shaped member 40. As shown in FIG. By using copper or a copper alloy as the constituent material of the ring-shaped member 40, the constituent material of the leaf spring 20 and the constituent material of the operation wire 30 have low wettability with solder (for example, stainless steel). , Ni-Ti alloy), the distal ends of the leaf spring 20 and the operation wire 30 can be firmly connected and fixed to the tip chip electrode 10.

2 to 4, in the electrode catheter 2 of the present embodiment, the distal end 203 and the operation wire 30 of the leaf spring 20 that are caulked by the ring-shaped member 40. The distal end portion 303 of) is connected and fixed to the tip chip electrode 10 by the solder 50 filled in the tip chip electrode 10.

That is, a solder filled in the distal end portion 203 of the leaf spring 20, the distal end portion 303 of the operation wire 30, and the ring-shaped member 40 inside the tip chip electrode 10 ( It is purchased in 50).

The material of the solder 50 filled in the tip chip electrode 10 is not particularly limited, and examples thereof include Sn-Pb, Sn-Pb-Ag, and Sn-Pb-Cu. It is also possible to use Sn-Ag-Cu, Sn-Cu, Sn-Ag, Sn-Ag-Cu-Bi and the like which are Pb-free solders.

In the electrode catheter 2 of this embodiment, by operating the handle 7 of the connector 6, either one end or the other end of the operation wire 30 is tensioned in the proximal direction, and the leaf spring 20 is As a result, the distal end of the electrode catheter 2 can be tilted in the direction indicated by the arrow A or B.

For example, by turning the knob 7 shown in FIG. 1 counterclockwise, one end of the operation wire 30 is tensioned in the proximal direction, and the leaf spring 20 is bent toward the one surface 201 side, whereby the electrode The distal end of the catheter 2 is deflected with a head shake in the direction indicated by the arrow A. FIG. Further, by turning the handle 7 clockwise, the other end of the operation wire 30 is tensioned in the proximal direction, and the leaf spring 20 is bent to the other surface 202 side, thereby distal end of the electrode catheter 2. The head shake is deflected in the direction indicated by the arrow B. FIG.

In this way, the strand spring 20 can be deflected in both directions on one surface 201 side (arrow A direction) and the other surface 202 side (arrow B direction) by one strand of the operation wire 30. Therefore, it is possible to reduce the number of parts (using one strand of the wire, which conventionally required two strands), and the manufacturing becomes easy.

Moreover, when the connector 6 is rotated by axial rotation, the direction of the A or B direction with respect to the electrode catheter 2 can be set freely in the state inserted in the body cavity.

According to the electrode catheter 2 of this embodiment, the distal end part of the operation wire 30 with respect to each surface of the one surface 201 and the other surface 202 in the distal end part 203 of the leaf spring 20 is carried out. Since 303 (part before and after the overlapping) is caulked by the ring-shaped member 40, the plate spring (regardless of the constituent material of the leaf spring 20 and the constituent material of the operation wire 30) The operation wire 30 can be firmly connected and fixed to the operation 20, and the operation wire 30 can be secured from one surface 201 or the other surface 202 of the leaf spring 20 during the use of the catheter (during hand technology). Does not deviate.

Moreover, according to the electrode catheter 2 of this embodiment, the distal end part 203 of the leaf spring 20, the distal end part 303 of the operation wire 30, and the ring-shaped member 40 which caulk these are fixed. ) Contacts (embedded) the solder 50 filled inside the tip chip electrode 10, and the tip chip electrode 10 is connected to the distal end of the catheter tube 4 and the distal end of the leaf spring 20. In addition to the two positions of the end portion 203, the connection member is also fixed (fixed) to the distal end portion 303 of the operation wire 30 that is caulked and fixed to the distal end portion of the leaf spring 20, and the ring-shaped member 40 ) Is increased by the increase in the contact area with the solder 50 due to the embedding and the improvement of the wettability with respect to the solder 50 due to the ring-shaped member 40 being made of copper or a copper alloy. 20) and the pullout resistance (fixing force of the tip chip electrode 10) with respect to the solder 50 of the operation wire 30 are increased. This makes it possible to reliably prevent the tip chip electrode 10 from falling off from the catheter tube 4.

In addition, the distal end 303 of the operation wire 30 is fixed to the one surface 201 and the other surface 202 at the distal end 203 of the leaf spring 20 by the ring-shaped member 40. In contact with the solder 50 in a closed state (a state where the distal end portion 203 of the leaf spring 20, the distal end portion 303 of the operation wire 30, and the ring-shaped member 40 are engaged). Therefore, the distal end portion 203 of the leaf spring 20 and the ring-shaped member 40 act as a fall prevention (draw resistance) against the force to draw the operation wire 30 from the solder 50. Thereby, when performing the tensioning operation of the operation wire 30, it is possible to reliably prevent the distal end of the operation wire 30 from falling out of the solder 50 filled in the tip chip electrode 10. Can be.

≪ Second Embodiment >

6 and 7 are partially broken front views and partially broken plan views on the distal end side of the electrode catheter according to another embodiment of the present invention.

In addition, the same code | symbol is used for the same or corresponding component as 1st Embodiment.

The external shape of the electrode catheter of this embodiment is the same as that of 1st embodiment shown in FIG. As shown in FIG. 6 and FIG. 7, the electrode catheter of the present embodiment includes a catheter tube 4, a tip chip electrode 10 fixed to a distal end of the catheter tube 4, and a catheter tube 4. A plurality of (two) ring-shaped electrodes 12 attached to the distal end, a plate spring 25 disposed inside the distal end side (near the distal end) of the catheter tube 4, and the catheter tube 4 A ring for caulking the distal end of the operating wire 35 to the surface of the distal end of the leaf spring 25 and the operation wire 35 disposed so as to extend in the axial direction. The shape member 40 and the fall prevention sleeve 60 attached to the distal end part of the operation wire 35 are provided.

The leaf spring 25 constituting the electrode catheter of the present embodiment has the same configuration as the leaf spring 20 constituting the first embodiment except that the notch is not formed at the distal end thereof.

As for the operation wire 35 which comprises the electrode catheter of this embodiment, one end becomes a proximal end, and the inside (surface 252 side of the leaf spring 25) of the catheter tube 4 distal direction (FIG. 6 and 7, upwards), the other end of which is the distal end.

The proximal end of the operation wire 35 is arrange | positioned so that tension operation is possible. That is, the proximal end of the operation wire 35 is connected to the handle (knob 7 shown in FIG. 1) for performing the deflection movement operation of the distal end of the catheter tube 4.

At the distal end of the operation wire 35, a large diameter portion (fall prevention portion) 35a for preventing fall is formed. As a formation method of the fall prevention part 35a, the method of forming by TIG welding can be illustrated, for example.

The distal end of the operation wire 35 is fixed to the surface 252 of the distal end of the leaf spring 25 by the ring-shaped member 40.

Thereby, by operating the handle of the connector and tensioning the operation wire 35, the leaf spring 25 is bent toward the surface 252 side, and the distal end of the electrode catheter swings in one direction (direction indicated by arrow B). Deflection is possible.

The anti-separation sleeve 60 constituting the electrode catheter of the present embodiment is attached to the distal end portion (the distal end side of the fixing position by the ring-shaped member 40) of the operation wire 35 (external) )

The outer diameter of the sleeve 60 is sized so that the sleeve 60 is not inserted in the space enclosed by the inner peripheral surface of the ring-shaped member 40 and the surface 252 of the leaf spring 25. Thereby, since the proximal end surface of the sleeve 60 is in contact with the distal end surface of the ring-shaped member 40, movement of the sleeve 60 in the proximal direction is restricted.

In addition, the inner diameter of the sleeve 60 is slightly larger than the outer diameter of the operation wire 35, but smaller than the diameter of the fall prevention part 35 of the operation wire 35. Thereby, the fall prevention part 35a of the operation wire 35 abuts on the distal end surface of the sleeve 60, and it is regulated that the operation wire 35 moves in the proximal direction of the inside of the sleeve 60. do.

By attaching such a sleeve 60 to the distal end of the operation wire 35, when the operation wire 35 is tensioned, the operation wire 35 moves proximally to the inside of the catheter tube 4. (The caulking fixed operation wire 35 falls off from the ring-shaped member 40) can be prevented reliably.

As a constituent material of the sleeve 60, although it does not specifically limit, For example, stainless steel etc. can be used, but it is preferable to use the metal material (for example, phosphor bronze) with wettability with the solder 50.

As shown in FIG. 6 and FIG. 7, in the electrode catheter of the present embodiment, the distal end portion of the leaf spring 25 and the distal end portion of the operation wire 35, which are caulked by the ring-shaped member 40, The solder 50 filled in the tip chip electrode 10 is connected to and fixed to the tip chip electrode 10.

That is, the distal end of the leaf spring 25, the distal end of the operation wire 35, the ring-shaped member 40, and the sleeve 60 are filled with solder filled inside the tip chip electrode 10 ( It is purchased in 50).

In the electrode catheter of the present embodiment, by operating the handle of the connector, one end (proximal end) of the operation wire 35 is pulled in the proximal direction and the plate spring 25 is bent, whereby the circle of the electrode catheter The upper end is capable of shaking the head in one direction.

For example, by turning the knob 7 shown in FIG. 1 clockwise, one end (proximal end) of the operation wire 35 is tensioned in the proximal direction, and the leaf spring 25 is bent toward the surface 252 side. As a result, the distal end of the electrode catheter is tilted in the direction indicated by the arrow B.

According to the electrode catheter of this embodiment, since the distal end part of the operation wire 35 is caulking by the ring-shaped member 40 with respect to the surface 252 in the distal end part of the leaf spring 25, Regardless of the constituent material of the plate spring 25 and the constituent material of the operation wire 35, the operation wire 35 can be firmly connected and fixed to the plate spring 25, and the catheter is in use (handwriting) ), The operation wire 35 is not detached from the surface 252 of the leaf spring 25.

Moreover, according to the electrode catheter of this embodiment, the distal end part of the leaf spring 25, the distal end part of the operation wire 35, the ring-shaped member 40 caulking and fixing these, and the operation wire 35 The sleeve 60 mounted at the distal end of the tip contacts (buried) the solder 50 filled inside the tip chip electrode 10, and the tip chip electrode 10 is distal of the catheter tube 4. In addition to the two positions of the distal end of the leaf spring 25, the connection is also fixed (fixed) to the distal end of the operation wire 35 that is caulked and fixed to the distal end of the leaf spring 25, and a ring shape. The increase in the contact area with the solder 50 due to the embedding of the member 40 and the sleeve 60, the ring-shaped member 40 being made of copper or a copper alloy, and the sleeve 60 being made of phosphor bronze By the improvement effect of the wettability with respect to the solder 50, the leaf spring 25 and the operation wire 35 of the phosphor 50 to the solder 50 are improved. The resistivity (fixing force of the tip chip electrode 10) is increased. This can reliably prevent the tip chip electrode 10 from falling off from the catheter tube 4.

Moreover, the distal end of the operation wire 35 is caulked and fixed to the surface 252 in the distal end of the leaf spring 25 by the ring-shaped member 40 (distal end of the leaf spring 20). And the distal end of the operation wire 35, the ring-shaped member 40, and the sleeve 50 are in contact with the solder 50, so that the operation wire 35 is soldered ( With respect to the force to be drawn from 50, the distal end of the leaf spring 25, the ring-shaped member 40 and the sleeve 60 act as a fall prevention (drawing resistance). Thereby, when performing the tensioning operation of the operation wire 35, it is possible to reliably prevent the distal end of the operation wire 35 from falling out of the solder 50 filled in the tip chip electrode 10. Can be.

≪ Third Embodiment >

8 and 9 are partially broken front views and partially broken plan views on the distal end side of the electrode catheter according to another embodiment of the present invention.

In addition, the same code | symbol is used for the same or corresponding component as 2nd Embodiment.

The external shape of the electrode catheter of this embodiment is the same as that of 1st embodiment shown in FIG. As shown to FIG. 8 and FIG. 9, the electrode catheter of this embodiment has the structure similar to 2nd Embodiment, and the surface 251 of the leaf spring 25 inside the catheter tube 4 is shown. The operation wire 36 arrange | positioned so that it may extend in the side, and the fall prevention sleeve 61 attached to the distal end part of the operation wire 36 are provided.

As for the operation wire 36 which comprises the electrode catheter of this embodiment, one end becomes a proximal end, and the inside of the catheter tube 4 is distal to the surface 251 side of the leaf spring 25 (FIG. 8 and 9, the other end of which is the wire which becomes the distal end, and has the same structure as the operation wire 35 extended to the surface 252 side of the leaf spring 25, and the operation wire ( Also at the distal end of 36, the fall prevention part 36a is formed.

The proximal end of the operation wire 36 is arrange | positioned so that tension operation is possible. That is, the proximal end of the operation wire 36 is connected to the handle (knob 7 shown in FIG. 1) for performing deflection movement operation of the distal end of the catheter tube 4.

The distal end of the operation wire 36 is fixed to the surface 251 of the distal end of the leaf spring 25 by the ring-shaped member 40.

The sleeve 61 constituting the electrode catheter of the present embodiment is attached (extrapolated) to the distal end of the operation wire 36.

The sleeve 61 has the same configuration as the sleeve 60 attached to the distal end of the operation wire 35, and the proximal end face of the sleeve 61 abuts against the distal end face of the ring-shaped member 40. It is regulated that 61 moves in the proximal direction. In addition, the falling prevention part 36a of the operation wire 36 abuts on the distal end surface of the sleeve 61, thereby restricting the movement of the operation wire 36 in the proximal direction of the inside of the sleeve 61. .

By attaching such a sleeve 61 to the distal end of the operation wire 36, when the operation wire 36 is tensioned, the operation wire 36 moves proximally to the inside of the catheter tube 4. (The caulking fixed operation wire 36 falls off from the ring-shaped member 40) can be prevented reliably.

As shown to FIG. 8 and FIG. 9, in the electrode catheter of this embodiment, the distal end part of the leaf spring 25, the distal end part of the operation wire 35, the sleeve 60 attached to this, and the operation The distal end of the wire 36, the sleeve 61 attached thereto, and the ring-shaped member 40 are embedded in the solder 50 filled in the tip chip electrode 10.

In the electrode catheter of this embodiment, the distal end of the catheter can be deflected by arrow A or B by operating the handle of the connector.

For example, by turning the knob 7 shown in FIG. 1 counterclockwise, one end (proximal end) of the operation wire 36 is tensioned in the proximal direction, and the leaf spring 25 is directed to the surface 251 side. By deflection, the distal end of the electrode catheter is shaken head in the direction indicated by the arrow A. In addition, by turning the knob 7 clockwise, one end (proximal end) of the operation wire 35 is tensioned in the proximal direction, and the leaf spring 25 is bent toward the surface 252 side, whereby the circle of the electrode catheter The upper end can deflect the head shaking in the direction indicated by the arrow B. FIG.

According to the electrode catheter of this embodiment, the distal end of the operation wire 35 is caulked with respect to the surface 252 in the distal end of the leaf spring 25 by the ring-shaped member 40, and a plate Since the distal end of the operation wire 36 is fixed to the surface 251 at the distal end of the spring 25, the constituent material of the leaf spring 25 and the operation wires 35 and 36 of the spring 25 are fixed. Regardless of the constituent material, the operation wires 35 and 36 can be firmly connected and fixed to the leaf springs 25, so that the surfaces 251 and 252 of the leaf springs 25 are in use (handed). ), The operation wires 36 and 35 do not come off.

Moreover, according to the electrode catheter of this embodiment, the distal end of the leaf spring 25, the operation wire 35, the sleeve 60, the operation wire 36, the sleeve 61, and a ring The shape member 40 is connected (buried) with the solder 50 filled in the tip chip electrode 10, and the tip chip electrode 10 is connected to the distal end of the catheter tube 4 and the leaf spring ( In addition to the two locations of the distal end of 25), the connection wire 35 and the distal end of the operation wire 36 caulked and fixed to the distal end of the leaf spring 25 are also fixed and fixed (fixed). The increase in the contact area with the solder 50 by embedding the ring-shaped member 40, the sleeve 60 and the sleeve 61, and the ring-shaped member 40 is made of copper or a copper alloy, The leaf spring 25, the operation wire 35, the operation wire 3 by the improvement effect of the wettability with respect to the solder 50 by the 60 and the sleeve 61 becoming phosphor bronze. The pullout resistance (fixing force of the tip chip electrode 10) to the solder 50 of 6) is increased. This can reliably prevent the tip chip electrode 10 from falling off from the catheter tube 4.

In addition, the distal ends of the operation wires 35 and 36 are fixed to the surfaces 252 and 251 at the distal ends of the leaf springs 25 by the ring-shaped member 40 (the leaf springs 20 ), The distal end of the operation wire 35, the sleeve 60, the distal end of the operation wire 36, the sleeve 61, and the ring-shaped member 40 are coupled to each other. Contact with the solder 50, the distal end of the leaf spring 25, the ring-shaped member against the force to draw the operation wire 35 or the operation wire 36 from the solder 50 40 and the sleeve 60 or 61 act as a fall prevention (drawing resistance). Thereby, when performing the tensioning operation of the operation wire 35 or the operation wire 36, the operation wire 35 or the operation is performed from the solder 50 filled in the tip chip electrode 10. The distal end of the wire 36 can be reliably prevented from falling out.

<Modifications>

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

For example, the distal end of the leaf spring and the distal end of the operation wire, which are caulked by the ring-shaped member, may be connected and fixed to the tip chip electrode by means other than solder.

Moreover, the aspect which does not connect and fix the distal end part of the leaf | plate spring caulking fixed by the ring-shaped member and the distal end part of an operation wire to a tip chip electrode is also included in the scope of the present invention.

2 electrode catheter
4 catheter tubes
6 connectors
7 handle
10 tip chip electrode
101 tip
102 cylindrical part
12 ring-shaped electrode
20 leaf springs
201 pages
202 rides
203 Distal end of leaf spring
25 leaf springs
251 pages
P. 252
30 Operation wire
303 Distal end of the operating wire
35,36 Operation Wire
40 ring members
50 solder
60,61 fall out sleeve

Claims (8)

Catheter tube,
A tip chip electrode fixed to the distal end of the catheter tube;
A leaf swinging leaf spring disposed along the axial direction inside the distal end side of the catheter tube and deformable in the bending direction;
An operation wire disposed in the catheter tube so as to extend in an axial direction, the proximal end of which is tension-operated;
A ring-shaped member for caulking the distal end of the operation wire to at least one of one surface and the other surface of the distal end of the leaf spring,
A tip deflection operable catheter, characterized by having a. The method of claim 1,
The distal end of the leaf spring and the operation wire, which are caulked by the ring-shaped member, are connected and fixed to the tip chip electrode by solder filled inside the tip chip electrode. Deflection operable catheter. 3. The method according to claim 1 or 2,
The one end and the other end of the operation wire is a proximal end, extends the inside of the catheter tube from the one end to the distal direction, passes through one side of the leaf spring, and folds at the distal end of the leaf spring, It becomes one strand of wire passing through the other surface side of the said leaf spring and extending in the proximal direction to the said other end, The distal end part of the said operating wire is caulking-fixed in the one side and the other surface of the distal end part of the said leaf spring. A tip deflection operable catheter, characterized in that there is. The method of claim 3,
The distal end portion of the leaf spring, a notch for guiding the overlap of the operation wire is formed, the tip deflection operable catheter. The method of claim 3,
A distal end of the leaf spring is provided with a through hole for guiding the overlap of the operation wire. 3. The method according to claim 1 or 2,
One end of the operation wire is a proximal end, and the inside of the catheter tube is extended in the distal direction, and the other end is a wire which becomes a distal end. In one side or the other side of the distal end of the leaf spring, A distal end operable catheter, wherein the distal end of the operation wire is fixed by caulking. The method according to claim 6,
At the distal end of the operation wire, a sleeve for preventing release is mounted, and at the distal end of the operation wire, a large diameter portion having a diameter larger than the inner diameter of the sleeve is formed,
The proximal end face of the sleeve abuts against the distal end face of the ring-shaped member, thereby restricting the movement of the sleeve in the proximal direction along one side or the other side of the leaf spring,
The large diameter portion of the distal end of the operation wire abuts against the distal end surface of the sleeve, whereby the operation wire is controlled to move the inside of the sleeve in the proximal direction. 3. The method according to claim 1 or 2,
A tip deflection operable catheter, wherein the ring-shaped member is made of copper or a copper alloy.

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