JP2004305604A - Wiring embedded catheter and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer a wiring embedded catheter which can be composed at a low cost without spoiling flexibility of the catheter by thumbnail constitution and its production method. <P>SOLUTION: The wiring embedded catheter 10 is composed so as to include a lining 11 equipped with a lumen 11a of a predetermined internal diameter, a wiring section 12 consisting of a spiral knitting wire provided on the outside of this lining 11, and an external layer 13 which surrounds the lining 11 and wiring section 12 from outside. Electric wiring to a movement mechanism, a micro sensor, etc. loaded at the tip of the catheter 10 can be provided easily and at a low cost by providing the wiring section 12 on the outside of the lining 11, the function of the lumen and the flexibility of the catheter itself are not reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a catheter, and more particularly, to a wire-embedded catheter having a built-in electric wire for operating various motion mechanisms and sensors at a distal end portion of the catheter, and a method of manufacturing the same.
[0002]
[Prior art]
In general, a catheter has a lumen for injecting a contrast agent, a drug solution, or the like, and for inserting various micro tools such as a guide wire. In order to make such a catheter multifunctional, when various movement mechanisms or microsensors are mounted on the catheter tip, these components are placed between the catheter tip and various devices to which the other end of the catheter is connected. A plurality of electric wires are required for driving the motion mechanism and the microsensor and transmitting signals.
[0003]
For this purpose, for example, Patent Literature 1 discloses a configuration in which such an electric wiring is inserted into a lumen of a catheter. Further, for example, Patent Document 2 discloses a method in which a metal thin film is formed on an outer wall of a catheter, and a wiring is formed by pattern etching.
[0004]
[Patent Document 1]
JP-A-7-265310 [Patent Document 2]
JP-A-10-151115
[Problems to be solved by the invention]
However, in the catheter according to Patent Document 1, the electric wiring is inserted through the lumen, so that the cross-sectional area of the lumen is substantially reduced, and the function of the lumen is impaired. At the same time, there is a problem that the rigidity of the catheter itself is increased and the flexible movement of the catheter is hindered.
On the other hand, in the catheter according to Patent Document 2, the wiring is formed by pattern-etching the metal thin film formed on the outer wall of the catheter, and the process for forming the wiring is complicated, and the cost is high. There is a problem that it becomes.
[0006]
In view of the above, an object of the present invention is to provide a wire-embedded catheter which can be configured at low cost by a simple configuration without impairing the flexibility of the catheter, and an object of the present invention is to provide a method of manufacturing the same. .
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided an inner layer having a lumen having a predetermined inner diameter, a wiring portion including a braided wire provided outside the inner layer, and an inner layer and a wiring portion. This is achieved by a wire-implantable catheter, comprising an outer layer surrounding from the outside.
[0008]
The wire-embedded catheter according to the present invention preferably has, between the wire portion and the outer layer, an intermediate layer made of an insulating material and a shield portion made of a knitted wire provided outside the intermediate layer.
[0009]
In the wire-embedded catheter according to the present invention, preferably, the knitted wires forming the wiring portion and the shield portion are spirally knitted around the inner layer.
[0010]
In the wire-embedded catheter according to the present invention, preferably, the braided wire is a copper-silver alloy wire.
[0011]
In the wire-embedded catheter according to the present invention, the inner layer, the outer layer, and the intermediate layer are preferably removed by etching at the distal end portion of the wire-embedded catheter, so that the wire portion and the shield portion are exposed.
[0012]
Further, according to the second aspect of the present invention, the first object is to form a first step of forming an inner layer having a bore having a predetermined inner diameter, and forming a wiring portion on the surface of the inner layer by knitting wires. This is achieved by a method for manufacturing a wire-embedded catheter, which includes two steps and a third step of forming an outer layer on the surface of the inner layer and the wiring portion.
[0013]
The method for producing a wire-embedded catheter according to the present invention preferably includes, after the second step, a fourth step of forming an intermediate layer made of an insulating material on the surface of the inner layer and the wiring section, and a braided wire on the surface of the intermediate layer. And a fifth step of forming a shield portion by the method.
[0014]
In the method of manufacturing a wire-embedded catheter according to the present invention, preferably, in the second step and / or the fourth step, a wiring portion and / or a shield portion are formed by knitting a knitted wire spirally.
[0015]
In the method for producing a wire-embedded catheter according to the present invention, preferably, the knitted wire is a copper-silver alloy wire.
[0016]
In the method for producing a wire-embedded catheter according to the present invention, preferably, after the outer layer is formed, the inner layer, the outer layer, and the intermediate layer are removed by etching at the tip, thereby exposing the wiring section and the shield section.
[0017]
According to the above configuration, by providing a wiring portion composed of a knitted wire between the inner layer having the lumen and the outer layer, it is possible to electrically connect with the movement mechanism and the microsensor mounted on the distal end portion of the catheter. Is possible, and the flexibility of the catheter is not impaired by the fact that the wiring portion is made of a knitted wire.
In addition, since complicated steps such as a conventional pattern etching step are not required, the cost is reduced, and the wiring is not inserted into the lumen provided in the inner layer. Function is not impaired by the wiring. Therefore, while having flexibility as a catheter, it is mounted on the distal end of the catheter while fully exhibiting the functions of the lumen, such as the injection of a contrast medium or a drug solution, the movement mechanism of a guide wire, and the insertion of a microsensor, by the lumen. It is possible to provide an electrical connection for a moving mechanism, a microsensor and the like to be performed.
[0018]
When an intermediate layer made of an insulating material is further provided between the wiring portion and the outer layer, and a shield portion made of a knitted wire provided outside the intermediate layer, the wiring portion is formed by the shield portion. In addition to being reliably shielded electrically, the shield portion is formed of a braided wire like the wiring portion, so that the flexibility of the catheter is not impaired.
[0019]
When the knitting wires constituting the wiring portion and the shield portion are spirally knitted around the inner layer, the shape of the lumen inside the inner layer is maintained by the spiral shape of these knitting wires, and the torque of the catheter is maintained. The transmission is ensured and the flexibility of the catheter is not impaired.
[0020]
In the case where the braided wire is a copper-silver alloy wire, in the step of knitting the braided wire outside the inner layer or the intermediate layer, even if a strong tension is applied to the braided wire, the braided wire extends along the longitudinal direction of the copper-silver alloy wire. Since the crystals are arranged side by side, they have a small electric resistance and a high resistance to tension. Therefore, they are suitable for forming a wiring portion without breaking a knitted wire during knitting.
[0021]
When the inner layer, outer layer, and intermediate layer are removed by etching at the distal end, the wiring section and the shield section are exposed. Can be easily connected.
[0022]
In this manner, according to the present invention, by providing a wiring portion formed of a spiral braided wire outside the inner layer, electric wiring for a movement mechanism, a microsensor, and the like mounted on the distal end portion of the catheter can be easily performed, and In addition to being able to be provided at a low cost, since the wiring portion is provided outside the inner layer, the function of the lumen is not impaired, and the wiring portion is knitted, in particular, spirally knitted By being composed of braided wires, the flexibility of the catheter itself is not impaired.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a side view showing the configuration of a first embodiment of a wire-embedded catheter according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the wire-embedded catheter of FIG.
In FIG. 1, the wiring embedding catheter 10 is formed in an elongated cylindrical shape having, for example, an outer diameter of 1.600 mm and a total length of about 1200 mm.
Further, as shown in the enlarged cross-sectional view of FIG. 2, the wiring embedding catheter 10 includes an inner layer 11, a wiring portion 12, and an outer layer 13.
[0024]
The inner layer 11 is made of, for example, a polymer material such as a fluororesin (trade name: Teflon (registered trademark)) or a silicone resin, and is formed in a hollow cylindrical shape so as to define an inner cavity 11a therein. ing. Here, the inner layer 11 is selected to have, for example, an outer diameter of 1.066 mm and an inner diameter of 0.760 mm.
[0025]
The wiring portion 12 is formed of a knitted wire made of a metal wire such as a copper-silver alloy wire having high tensile strength.
FIG. 3 is a partially enlarged perspective view of the wire-embedded catheter of FIG. Here, as shown in FIG. 3, the wiring section 12 is, for example, a copper-silver alloy wire having an outer diameter of 0.046 mm provided with an insulating coating such as enamel on the surface of a copper-silver alloy wire having a diameter of 0.040 mm. Using 16 pieces, they are wound in a spiral shape while applying a tension clockwise and counterclockwise to the outer surface of the inner layer 11 at a pitch of 4.0 mm, thereby forming a knitted shape. As a result, the wiring portion 12 has a thickness of about 0.184 mm and an outer diameter of about 1.250 mm.
[0026]
The outer layer 13 is made of, for example, a polymer material such as a fluororesin or a silicone resin, like the inner layer 11. Here, the outer layer 13 is selected to have, for example, a thickness of 0.350 mm and an outer diameter of 1.600 mm.
[0027]
Further, in the vicinity of the distal end of the catheter 10, it is necessary to take out the end 12a of the wiring portion 12 for connection to a movement mechanism mounted on the distal end, a microsensor, or the like. The removal of the end 12a of the wiring portion 12 is performed by removing the inner layer 11 and the outer layer 13 near the end 12a.
[0028]
Next, a method for manufacturing the above-described wire-embedded catheter 10 will be described with reference to FIG. FIG. 4 is a flowchart sequentially showing the manufacturing steps of the wire-embedded catheter of FIG.
First, in step A1, the inner layer 11 is formed by coating or extruding with a polymer material. The molding of the inner layer 11 is easily performed by using a usual molding machine.
[0029]
Subsequently, in step A2, the wiring portion 12 is formed by spirally winding the knitted wire outside the inner layer 11 while applying tension. In this case, since a copper-silver alloy wire having high resistance to tension is used as a knitted wire constituting the wiring portion 12, the knitted wire does not break during the winding operation.
[0030]
Then, in step A3, while the inner layer 11 having the wiring portion 12 is fed in the longitudinal direction, the outer layer 13 is formed on the surface by coating or extrusion molding with a polymer material.
[0031]
Finally, in step A4, the knitted wires of the wiring section 12 are taken out by removing the inner layer 11 and the outer layer 13 in the region of the distal end portion of the wiring embedding catheter 10.
In addition, the catheter 10 in which such a wiring portion 12 is embedded is manufactured by a manufacturing apparatus for manufacturing a so-called bladed catheter in which a helical polymer or metal is embedded in order to improve torque transmission of a conventional catheter. It can be easily manufactured by using a braided wire instead of a polymer or metal.
[0032]
Hereinafter, such removal of the inner layer 11 and the outer layer 13 will be described.
First, a metal rod (not shown), for example, a piano wire is inserted into the inner cavity 11a inside the inner layer 11, and the surface of the inner cavity 11a is closed. From this state, the entire distal end portion of the catheter 10 is etched using an etchant for a polymer material constituting the inner layer 11 and the outer layer 13.
[0033]
For example, when the inner layer 11 and the outer layer 13 are made of a fluororesin, a selective etchant that etches only the fluororesin and does not etch the knitted wire is used as the etchant.
[0034]
By such etching, the inner layer 11 and the outer layer 13 are removed in the region of the distal end portion of the catheter 10, so that the knitted wires constituting the wiring portion 12 in this region are exposed, and the wiring portion 12 is taken out. Can be easily performed.
Thus, the wire-embedded catheter 10 is completed.
[0035]
The wiring-embedded catheter 10 according to the present invention is configured as described above. By providing the wiring portion 12 made of a spiral braided wire on the outside of the inner layer 11, a movement mechanism and a micro mechanism mounted on the distal end portion of the catheter 10 are provided. Electrical wiring for sensors and the like can be provided easily and at low cost.
[0036]
Further, since the wiring portion 12 is provided outside the inner layer 11, the wiring is not inserted into the lumen 11a, so that the function of the lumen 11a is not impaired. Furthermore, since the wiring portion 12 is formed of a knitted wire, in particular, a helical knitted wire, the rigidity of the catheter 10 itself is not increased, and the flexibility of the catheter 10 may be impaired. Absent.
[0037]
The above-described wiring-embedded catheter 10 is selected to have an inner diameter of 0.760 mm and an outer diameter of 1.600 mm. However, the present invention is not limited to this, and other dimensions may be used. For example, an inner diameter of 1.360 mm and an outer diameter of 2.200 mm are selected. May be. In this case, the outer diameter of the inner layer 11 is 1.666 mm, and the inner diameter of the outer layer 11 is 1.850 mm.
[0038]
Next, a second embodiment of the wire-embedded catheter according to the present invention will be described.
FIG. 5 is a side view showing the configuration of a second embodiment of the wire-embedded catheter according to the present invention, and FIG. 6 is an enlarged cross-sectional view of the wire-embedded catheter of FIG.
In FIG. 5, the wiring embedding catheter 20 is formed in an elongated cylindrical shape having an outer diameter of, for example, 3000 mm and a total length of about 1200 mm. Further, as shown in the enlarged cross-sectional view of FIG. 6, the wiring embedding catheter 20 includes an inner layer 21, a wiring portion 22, an intermediate layer 23, a shield portion 24, and an outer layer 25.
[0039]
The inner layer 21 is made of, for example, a polymer material such as a fluororesin or a silicone resin, and is formed in a hollow cylindrical shape so as to define a lumen 21a therein. Here, the inner layer 21 is selected to have, for example, an outer diameter of 1.870 mm and an inner diameter of 1.470 mm.
[0040]
The wiring portion 22 is formed of a knitted wire made of a metal wire such as a copper-silver alloy wire having a high tensile strength. The wiring portion 22 is made of, for example, a copper-silver alloy wire having a diameter of 0.046 mm and having an insulating coating such as enamel on the surface thereof, similarly to the wiring portion 12 in the wiring embedding catheter 10 shown in FIGS. 1 and 2. It is formed in a knitted shape by using 16 silver alloy wires and spirally applying clockwise and counterclockwise tension on the outer surface of the inner layer 21 at a pitch of 4.0 mm to the outer surface. . Thus, the wiring portion 22 has a thickness of about 0.184 mm and an outer diameter of about 2.054 mm.
[0041]
The intermediate layer 23 is made of, for example, a polymer material such as a fluororesin or a silicone resin, like the inner layer 21. The intermediate layer 23 is selected to have, for example, a thickness of 0.346 mm and an outer diameter of 2.400 mm.
[0042]
The shield part 24 is made of a knitted wire made of a metal wire such as stainless steel. Like the wiring part 22, the shield part 24 uses, for example, 32 stainless steel wires having a diameter of 0.040 mm, clockwise and counterclockwise with respect to the outer surface of the intermediate layer 23 at a pitch of 2.5 mm. It is formed in a knitted shape by winding while applying tension in a spiral. Thus, the shield part 24 has a thickness of about 0.160 mm and an outer diameter of about 2.560 mm.
[0043]
The outer layer 25 is made of, for example, a polymer material such as a fluororesin or a silicone resin, like the inner layer 21 and the intermediate layer 23. The outer layer 25 is selected to have, for example, a thickness of 0.440 mm and an outer diameter of 3.000 mm.
[0044]
Further, in the vicinity of the distal end of the catheter 20, the ends 22a and 24a of the wiring portion 22 and the shield portion 24 are taken out for connection to a movement mechanism mounted on the distal end, a microsensor, or the like. This is performed by removing the inner layer 21, the intermediate layer 23 and the outer layer 25 near 22a and 24a by etching.
[0045]
Next, a method of manufacturing the above-described wire-embedded catheter 20 will be described with reference to FIG. FIG. 7 is a flowchart sequentially showing the steps of manufacturing the wire-embedded catheter of FIG.
First, in step B1, the inner layer 21 is formed by coating or extrusion molding with a polymer material. Subsequently, in step B2, the wiring portion 22 is formed by spirally winding the knitted wire outside the inner layer 21 while applying tension.
[0046]
Thereafter, in step B3, while the inner layer 21 provided with the wiring portion 22 is sent out in the longitudinal direction, the intermediate layer 23 is formed on the surface thereof by coating or extrusion molding with a polymer material. Next, in Step B4, the shield portion 24 is formed by winding the knitted wire spirally while applying tension to the outside of the intermediate layer 23.
[0047]
Thereafter, in step B5, the outer layer 25 is coated or extruded with a polymer material on the surface of the shield part 24 while the inner layer 21 having the wiring part 22, the intermediate layer 23 and the shield part 24 is sent out in the longitudinal direction. And the like.
Finally, in step B6, the inner layer 21, the intermediate layer 23, and the outer layer 25 are removed in the region of the distal end portion of the wiring embedding catheter 20 to take out the knitted wires of the wiring portion 22 and the shield portion 24.
In this way, the wire-embedded catheter 20 is completed.
[0048]
The wiring-embedded catheter 20 according to the present invention is manufactured as described above, and by providing the wiring portion 22 formed of a helical braided wire outside the inner layer 21, a movement mechanism and a micro sensor mounted on the distal end portion of the catheter 20 are provided. And the like can be provided easily and at low cost.
[0049]
Further, since the wiring portion 22 is provided outside the inner layer 21, the wiring does not pass through the lumen 21a, so that the function of the lumen 21a is not impaired. Further, since the wiring portion 22 is formed of a knitted wire, in particular, a helical knitted wire, the rigidity of the catheter 20 itself is not increased, and the flexibility of the catheter 10 may be impaired. Absent.
[0050]
Furthermore, since the wiring portion 22 is surrounded by the shield portion 24 located outside the wiring portion 22, the wiring portion 22 is shielded from the influence of an external electromagnetic field, that is, shielded. This eliminates disturbance noise and the like mixed into the wiring section 22, and improves the S / N ratio of a signal passing through the wiring section 22.
[0051]
In the above-described embodiment, the wiring portions 12 and 22 are made of a braided copper-silver alloy wire. However, the present invention is not limited to this. Obviously, it may be possible.
[0052]
In the above-described embodiment, only one wiring portion 12 or 22 is provided. However, since at least one wiring portion is further provided outside the wiring portions 12 and 22 with an insulating layer interposed therebetween, a multilayer structure is provided. It is clear that the wiring section may be provided.
[0053]
【The invention's effect】
As described above, according to the present invention, by providing a wiring portion formed of a spiral braided wire outside the inner layer, it is possible to easily and electrically connect a movement mechanism, a microsensor, and the like mounted on the distal end portion of the catheter. In addition to being able to be provided at a low cost, since the wiring portion is provided outside the inner layer, the function of the lumen is not impaired, and the wiring portion is knitted, in particular, spirally knitted By being composed of braided wires, the flexibility of the catheter itself is not impaired.
[0054]
As described above, according to the present invention, there is provided an extremely excellent wire-embedded catheter and a method for manufacturing the same, which can be configured at a low cost with a simple configuration without impairing the flexibility of the catheter. You.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of a first embodiment of a wire-embedded catheter according to the present invention.
FIG. 2 is an enlarged sectional view of the wiring implantation catheter of FIG.
FIG. 3 is a partially enlarged perspective view of the wiring implantation catheter of FIG. 1;
FIG. 4 is a flowchart sequentially showing manufacturing steps of the wire-embedded catheter of FIG. 1;
FIG. 5 is a side view showing the configuration of a second embodiment of the wire-embedded catheter according to the present invention.
FIG. 6 is an enlarged sectional view of the wiring implantation catheter of FIG. 5;
FIG. 7 is a flowchart sequentially showing the manufacturing steps of the wire-embedded catheter of FIG.
[Explanation of symbols]
10,20 Wiring implant catheter 11,21 Inner layer 11a, 21a Lumen 12,22 Wiring part 13,25 Outer layer 23 Intermediate layer 24 Shield part

Claims (10)

An inner layer having a lumen having a predetermined inner diameter, a wiring portion formed of a knitted wire provided outside the inner layer, and an outer layer surrounding the inner layer and the wiring portion from the outside are included. , Wiring implanted catheter. The semiconductor device according to claim 1, further comprising an intermediate layer made of an insulating material, and a shield part made of a knitted wire provided outside the intermediate layer, between the wiring part and the outer layer. The implantable wiring catheter according to claim 1. The wire-embedded catheter according to claim 1 or 2, wherein the knitted wires constituting the wiring portion and the shield portion are spirally knitted around an inner layer. The wire-embedded catheter according to any one of claims 1 to 3, wherein the braided wire is a copper-silver alloy wire. The wiring portion and the shield portion are exposed by removing an inner layer, an outer layer, and an intermediate layer by etching at a distal end portion of the wire embedding catheter, thereby exposing the wiring portion and the shield portion. Wiring implantable catheter. A first step of forming an inner layer with a lumen of a predetermined inner diameter,
A second step of forming a wiring portion on the surface of the inner layer by knitting,
A third step of forming an outer layer on the surface of the inner layer and the wiring section, the method comprising the steps of: After the second step, a fourth step of forming an intermediate layer made of an insulating material on the surface of the inner layer and the wiring portion;
The method for producing a wire-embedded catheter according to claim 6, further comprising: a fifth step of forming a shield portion on the surface of the intermediate layer by a knitted wire. 8. The wiring according to claim 6, wherein in the second step and / or the fourth step, a wiring part and / or a shield part is formed by spirally knitting a knitted wire. 9. Manufacturing method of implantable catheter. The method according to any one of claims 6 to 8, wherein the knitted wire is a copper-silver alloy wire. 10. The wiring embedding according to claim 6, wherein the wiring portion and the shield portion are exposed by removing the inner layer, the outer layer, and the intermediate layer by etching at a tip portion after forming the outer layer. Method for manufacturing a catheter.

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