Electric wire connection structure and method for manufacturing the same

Abstract

To provide an electric wire connection structure that makes it easy to maintain the spacing between multiple exposed core wire portions, and a method for manufacturing the same.SOLUTION: An electric wire connection structure 1 includes a plurality of electric wires 3, an electronic component 2, and a core wire fixing material 4. The plurality of electric wires 3 include coated portions 301 in which a core wire 31 is covered with a coating 32, and exposed core portions 302 in which the core wire 31 is exposed from the coating 32, and the exposed core portions 302 are arranged in parallel. The electronic component 2 has a plurality of electrodes 21 to which the exposed core portions 302 of the plurality of electric wires 3 are respectively connected. The core wire fixing material 4 fixes the exposed core portions 302 together.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an electric wire connection structure and a method for manufacturing the electric wire connection structure. [Background technology]

[0002] Patent Document 1 discloses an electric wire connection structure including a plurality of electrodes provided on a pressure sensor for catheter treatment and a plurality of electric wires respectively connected to the plurality of electrodes. The plurality of electric wires have exposed core portions in which the core wires are exposed, and are arranged in parallel and connected to the plurality of electrodes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2015 / 0137274 Summary of the Invention [Problem to be solved by the invention]

[0004] In the electric wire connection structure described in Patent Document 1, it is difficult to maintain the distance between the multiple exposed core wire portions.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide an electric wire connection structure and a method for manufacturing the electric wire connection structure that make it easy to maintain the spacing between multiple exposed core wire portions. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides an electric wire connection structure comprising: a plurality of electric wires having a coated portion in which a core wire is covered with a coating and a core exposed portion in which the core wire is exposed from the coating, the core exposed portions being arranged in parallel; an electronic component having a plurality of electrodes to which the core exposed portions of the plurality of electric wires are respectively connected; and a core fixing material that fixes the plurality of core exposed portions together.

[0007] In addition, in order to achieve the above-mentioned object, the present invention provides a method for manufacturing an electric wire connection structure, comprising: an electric wire fixing step of arranging in parallel exposed core portions of a plurality of electric wires, where the core wires of the plurality of electric wires are exposed from the coating, and fixing the exposed core portions with a core wire fixing material; and a connection step that is performed after the electric wire fixing step and connects the exposed core portions of the plurality of electric wires to a plurality of electrodes of an electronic component, respectively. Effect of the Invention

[0008] According to the present invention, it is possible to provide an electric wire connection structure and a method for manufacturing the electric wire connection structure, which facilitates maintaining the spacing between a plurality of exposed core portions. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view of an electric wire connection structure according to a first embodiment. FIG. [Diagram 2] FIG. 1 is a plan view of an electric wire connection structure according to a first embodiment. [Diagram 3] 1 is a cross-sectional view of an electric wire connection structure passing through core wires of a plurality of electric wires in a first embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 3 is a cross-sectional view taken along line VV in FIG. 2. [Figure 6] FIG. 3 is a plan view of three electric wires prepared in an electric wire preparing step in the first embodiment. [Figure 7] FIG. 4 is a plan view of the three electric wires and the core wire fixing material after the electric wire fixing step in the first embodiment. [Figure 8] 4 is a plan view of the electronic component, three conductive bonding materials, three electric wires, and a core wire fixing material after a connecting step in the first embodiment. FIG. [Figure 9] FIG. 11 is a cross-sectional view of an electric wire connection structure according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [First embodiment] A first embodiment of the present invention will be described with reference to Figures 1 to 8. Note that the embodiment described below is shown as a preferred specific example for carrying out the present invention, and while there are some parts that specifically exemplify various technical matters that are technically preferable, the technical scope of the present invention is not limited to this specific embodiment.

[0011] (Electric wire connection structure) Fig. 1 is a perspective view of an electric wire connection structure 1 in this embodiment. Fig. 2 is a plan view of the electric wire connection structure 1. Fig. 3 is a cross-sectional view of the electric wire connection structure 1 through which core wires 31 of a plurality of electric wires 3 pass. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 2.

[0012] The electric wire connection structure 1 of this embodiment constitutes a device used in a medical device inserted into the body. The medical device inserted into the body is required to be small and thin in diameter so that it can be inserted into the body and the burden on the human body can be reduced. As an example of a medical device equipped with the electric wire connection structure 1 of this embodiment, a guidewire equipped with a pressure sensor is assumed. The guidewire is used to guide the movement of a catheter inside the body.

[0013] The use of the electric wire connection structure 1 is not limited thereto, and may be, for example, a medical device other than a guide wire to be inserted into the body. Furthermore, the electric wire connection structure 1 can be applied to uses other than medical devices as long as it is a structure in which a plurality of electric wires 3 and a plurality of electrodes 21 of an electronic component 2 are connected.

[0014] The electric wire connection structure 1 of this embodiment includes an electronic component 2, a plurality of electric wires 3, a core wire fixing material 4, and a sealing material 5. The electronic component 2 includes a plurality of electrodes 21. The plurality of electric wires 3 include a covering portion 301 in which a core wire 31 is covered with a covering 32, and a core wire exposed portion 302 in which the core wire 31 is exposed from the covering 32. The core wire exposed portions 302 of the plurality of electric wires 3 are arranged in parallel. Hereinafter, the longitudinal direction of each core wire exposed portion 302 is referred to as the "axial direction X", the direction in which the plurality of core wire exposed portions 302 are arranged is referred to as the width direction Y, and the direction perpendicular to both the axial direction X and the width direction Y is referred to as the height direction Z. The core wire fixing material 4 fixes the plurality of core wire exposed portions 302 to each other. The sealing material 5 seals the plurality of electrodes 21, the tip portions of the plurality of electric wires 3, and the core wire fixing material 4. For convenience, in FIG. 1, only the outline of each of the core wire fixing material 4 and the sealing material 5 is shown by a dashed line.

[0015] The electronic component 2 is formed in a rectangular parallelepiped shape that is long in the axial direction X and has a thickness in the height direction Z. The electronic component 2 includes a sensor unit 20 and a plurality of electrodes 21. In this embodiment, the sensor unit 20 is a pressure sensor that detects the pressure in a blood vessel. Although detailed illustration is omitted, the pressure sensor includes a diaphragm that bends under the pressure of blood and a Wheatstone bridge having a strain gauge whose electrical resistance decreases according to the deformation of the diaphragm (for example, the pressure sensor described in JP 2023-39717 A). Note that the electronic component 2 may be an electronic component other than a sensor.

[0016] The multiple electrodes 21 are composed of a total of three electrodes, including one input electrode for applying a voltage to the Wheatstone bridge of the sensor unit 20, and two output electrodes connected to two points of the Wheatstone bridge, the potential difference of which changes according to the pressure acting on the diaphragm. The number of electrodes 21 provided in the electronic component 2 may be two or four or more as long as it is more than one. The same applies to the number of electric wires 3 connected to the electrodes 21.

[0017] The three electrodes 21 are configured by a wiring pattern formed on one surface of the electronic component 2 in the height direction Z. The three electrodes 21 are rectangular plate-like, long in the axial direction X and short in the width direction Y, and are arranged in parallel in the width direction Y. The width of the three electrodes 21 is, for example, 0.1 mm or less. The pitch of the three electrodes 21 is, for example, 0.1 mm or less. The exposed core portions 302 of the three electric wires 3 are connected to the three electrodes 21, respectively.

[0018] The electric wire 3 includes a core wire 31 and a coating 32. The core wire 31 is made of a material with good electrical conductivity, such as a copper alloy plated with silver, gold, or the like, and is configured as a single wire with a circular cross section. Plating the core wire 31 with silver, gold, or the like makes it easier to solder the core wire 31 to the electrode 21, as described below. The diameter of the core wire 31 is, for example, 0.05 mm or less. The core wire 31 may be configured as a twisted wire, but a single wire is easier to form into a straight line and makes it easier to keep the three exposed core wire portions 302 parallel to each other. When the core wire 31 is a twisted wire, the diameter of the core wire 31 can be the diameter of a circumscribing circle of the multiple strands that make up the core wire 31.

[0019] The coating 32 is made of an electrically insulating resin. In this embodiment, the coating 32 is made of a highly heat-resistant fluorine-based resin such as PFA (tetrafluoroethylene-perfluoroalkylvinylether copolymer) or PTFE (polytetrafluoroethylene).

[0020] As described above, the electric wire 3 includes a covering portion 301 in which the core wire 31 is covered with the covering 32, and an exposed core portion 302 in which the core wire 31 is exposed from the covering 32. The tip surfaces 321 of the coverings 32 of the three electric wires 3 are aligned at the same positions, and the exposed core portions 302 protrude from the tip surfaces 321 of the coverings 32 toward the tip side. As shown in Figs. 3 and 4, the length L in the axial direction X from the tip surfaces 321 of the coverings 32 of the three electric wires 3 to the electronic component 2 is, for example, 0.5 mm or less. The exposed core portions 302 of the three electric wires 3 are aligned in a row parallel to each other. The exposed core portions 302 are connected to the electrode 21 in a position parallel to the electrode 21.

[0021] The multiple exposed core wire portions 302 and the multiple electrodes 21 are connected to each other using a conductive bonding material 6 that melts and hardens with a change in temperature. In this embodiment, the conductive bonding material 6 is made of solder that melts when heated and hardens when cooled, particularly Au-Sn-based solder that has a relatively high melting temperature. The material of the conductive bonding material 6 is not limited to this, and may be solder of another material. The three exposed core wire portions 302 are fixed to each other at the side connected to the electrode 21 and the opposite side by a core wire fixing material 4.

[0022] The core wire fixing material 4 fixes the three exposed core wire portions 302 so that the pitch of the three exposed core wire portions 302 is the same as the pitch of the three electrodes 21. The core wire fixing material 4 covers the entire periphery of each of the three core wire fixing materials 4, integrating them together.

[0023] The core wire fixing material 4 is made by hardening a molten resin filled around the three exposed core wire parts 302, and has electrical insulation properties. The core wire fixing material 4 is made of a heat-resistant material that can withstand the heating temperature when the conductive bonding material 6 is used to bond the exposed core wire parts 302 and the electrode 21. For example, the core wire fixing material 4 is made of an ultraviolet (UV)-curable epoxy adhesive or the like. The core wire fixing material 4 can be made of a material that does not have adhesive properties with the coating 32, for example, but may also be made of a material that has adhesive properties with the coating 32, such as the sealing material 5 described below.

[0024] The core wire fixing member 4 covers the roots of the three exposed core wire portions 302 (i.e., the ends on the tip surface 321 side of the coating 32). As shown in Figs. 3 and 4, at least a part of the core wire fixing member 4 is disposed on the tip surface 321 side of the coating 32 with respect to a center position C between the electronic component 2 and the tip surface 321 of the coating 32 in the axial direction X. In this embodiment, the entire core wire fixing member 4 is disposed on the tip surface 321 side of the coating 32 with respect to the center position C. In particular, in this embodiment, the core wire fixing member 4 has a contact surface 41 that contacts the tip surfaces 321 of the three coatings 32. Note that, when the positions of the tip surfaces 321 of the three coatings 32 are not aligned, the center position C is set to be the center position between the electronic component 2 and the tip surface 321 of the three coatings 32 that is closest to the electronic component 2.

[0025] 5 is a cross-sectional view taken along the line VV in FIG. 2. The core wire fixing material 4 is formed in a bulk shape with a thickness T (i.e., a dimension in the height direction Z) equal to or larger than the diameter D of the core wire 31. That is, the core wire fixing material 4 is not formed in a thin film shape on the surface of each core wire 31, but is formed in a thick shape that fills the gaps between the three exposed core wire parts 302 and has a thickness T equal to or larger than the diameter D of the core wire 31. By forming the core wire fixing material 4 in a bulk shape, the strength of the core wire fixing material 4 is ensured, and the intervals between the three exposed core wire parts 302 are easily maintained. Note that, for example, when the core wire fixing material 4 has a distorted shape and the thickness varies depending on the part, the thickness T means the maximum thickness of the core wire fixing material 4.

[0026] The sealing material 5 covers the three electrodes 21, the three exposed core wire portions 302, the tips of the three coating portions 301, and the core wire fixing material 4, and prevents moisture such as blood from penetrating into the conductive portion of the electric wire connection structure 1. The sealing material 5 is made of a material that has adhesive properties to the fluorine-based resin that constitutes the coating 32. As an example, the sealing material 5 can be made of a cyanoacrylate-based adhesive that has been treated to improve adhesiveness, such as with a primer.

[0027] (Method of manufacturing electric wire connection structure) Next, a method for manufacturing the electric wire connection structure 1 in this embodiment will be described. The method for manufacturing the electric wire connection structure 1 of this embodiment includes performing an electric wire preparing step, an electric wire fixing step, a connecting step, and a sealing step in this order.

[0028] 6 is a plan view of three electric wires 3 prepared in an electric wire preparation step. In the electric wire preparation step, three electric wires 3 each having an exposed core portion 302 are prepared. In this embodiment, the exposed core portion 302 is formed by removing a part of the coating 32 from the three electric wires 3. At this time, the position of the tip surface 321 of the coating 32 and the length of the exposed core portion 302 are aligned for the three electric wires 3.

[0029] After the electric wire preparing step, an electric wire fixing step is carried out. Fig. 7 is a plan view of the three electric wires 3 and the core wire fixing material 4 after the electric wire fixing step. In the electric wire fixing step, first, the three core wire exposed portions 302 are arranged in parallel so as to have the same pitch as the three electrodes 21. In arranging the three core wire exposed portions 302 in parallel, for example, a jig having three grooves formed therein with the same pitch as the three electrodes 21 is used, and the three core wire exposed portions 302 are respectively placed in the three grooves, so that the three core wire exposed portions 302 can be arranged in parallel.

[0030] The three exposed core wire portions 302 arranged in parallel are fixed to each other by the core wire fixing material 4. When a UV-curable resin is used as the core wire fixing material 4, the molten resin that becomes the core wire fixing material 4 is applied so as to cover the three exposed core wire portions 302, and the molten resin is cured by irradiating the molten resin with ultraviolet light to obtain the core wire fixing material 4. In this embodiment, the core wire fixing material 4 is formed so as to contact the tip surfaces 321 of the three coatings 32 as described above. By the core wire fixing material 4 contacting the tip surfaces 321 of the three coatings 32, the molten resin that becomes the core wire fixing material 4 is easily spread along the tip surfaces 321 of the three coatings 32, and is easily formed in a bulk shape. The core wire fixing material 4 may be formed by a method other than coating, and for example, a molding method or the like can be used.

[0031] After the electric wire fixing step, the connecting step is performed. FIG. 8 is a plan view of the electronic component 2, the three conductive bonding materials 6, the three electric wires 3, and the core wire fixing material 4 after the connecting step. In the connecting step, the three core wire exposed parts 302 and the three electrodes 21 are connected using the conductive bonding materials 6. In this embodiment, in the connecting step, first, a solder paste that becomes the conductive bonding material 6 is placed on each of the three electrodes 21 of the electronic component 2. Then, the three core wire exposed parts 302 are made to face the three electrodes 21, respectively, and are brought into contact with the solder paste placed on the three electrodes 21, respectively. Then, the solder paste is melted and hardened by reflowing at a temperature of, for example, about 300° C., and the conductive bonding material 6 that mechanically and electrically connects the three core wire exposed parts 302 and the three electrodes 21 is formed. The material of the core wire fixing material 4 is selected so as to be able to withstand the high temperature environment at this time.

[0032] After the connection process, a sealing process is carried out. In the sealing process, the three electrodes 21, the three exposed core wire portions 302, the tips of the three coating portions 301, and the core wire fixing material 4 are covered with a molten resin that becomes the sealing material 5, and then the molten resin is cured to form the sealing material 5 as shown in Figs. 2 to 4. As described above, the electric wire connection structure 1 of this embodiment can be manufactured.

[0033] (Functions and Effects of the First Embodiment) The electric wire connection structure 1 of this embodiment includes a core wire fixing material 4 that fixes the multiple exposed core wire portions 302 together. This makes it easy to maintain the distance between the multiple exposed core wire portions 302. This prevents the exposed core wire portions 302 from coming into contact with each other and becoming conductive due to deformation of the exposed core wire portions 302 during the manufacturing process, for example.

[0034] Moreover, the core wire fixing material 4 is formed by hardening molten resin filled around the multiple exposed core portions 302, and is in contact with the tip surfaces 321 of the multiple coatings 32. Therefore, the molten resin that becomes the core wire fixing material 4 easily spreads along the tip surfaces 321 of the multiple coatings 32, and is easily formed in a bulk shape. By forming the core wire fixing material 4 in a bulk shape, the strength of the core wire fixing material 4 is increased, and peeling of the core wire exposed portions 302 from the core wire fixing material 4 is suppressed.

[0035] Moreover, the electric wire connection structure 1 of this embodiment further includes a sealant 5 that seals the electrodes 21, the tips of the electric wires 3, and the core wire fixing member 4. This, for example, suppresses the intrusion of moisture and the like into the electrodes 21 and the electric wires 3. Furthermore, by configuring the core wire fixing member 4 and the sealant 5 separately, the freedom of material selection increases. For example, while a material that has adhesive properties to the objects to be sealed (in this embodiment, the three electrodes 21, the core wires 31 and the coatings 32 of the three electric wires 3, and the core wire fixing member 4) is selected as the sealant 5, it is possible to use a material that does not have such adhesive properties as the core wire fixing member 4.

[0036] Furthermore, at least a portion of the core wire fixing member 4 is disposed, in the axial direction X, closer to the tip surface 321 of the coating 32 than a central position C between the electronic component 2 and the tip surface 321 of the coating 32. This makes it possible to prevent the core wire fixing member 4 from being affected by (e.g., thermal, mechanical, and other effects) when the electrodes 21 and the exposed core wire portions 302 are connected, without increasing the length L in the axial direction X from the tip surfaces 321 of the coatings 32 of the three electric wires 3 to the electronic component 2. This makes it possible to reduce the sealing area of ​​the sealing material 5, thereby reducing the overall weight of the electric wire connection structure 1 and simplifying the sealing process for forming the sealing material 5.

[0037] Moreover, the coating 32 is made of a fluororesin, and the sealing material 5 seals the coating 32 up to its tip and is made of a material that is adhesive to the fluororesin. While there are limited materials that can adhere to fluororesin, according to this embodiment, for example, since the intrusion of moisture from the interface between the coating 32 and the sealing material 5 into the conductive parts of the electrodes 21 and the electric wires 3 is suppressed, the core wire fixing material 4 is not necessarily required to have adhesiveness to the contact object, and the degree of freedom in material selection is increased.

[0038] Moreover, the core wire fixing material 4 is formed in a bulk shape with a thickness T equal to or larger than the diameter D of the core wire 31. Therefore, the strength of the core wire fixing material 4 is increased, and as a result, the core wire exposed portion 302 is prevented from peeling off from the core wire fixing material 4 due to, for example, the core wire fixing material 4 cracking.

[0039] Furthermore, the multiple core wire exposed portions 302 and the multiple electrodes 21 are connected to each other using a conductive bonding material 6 that melts and hardens due to temperature changes. Therefore, the core wire fixing material 4 is affected by thermal changes when the core wire exposed portions 302 and the electrodes 21 are connected, and thermal stress is likely to occur in this situation. However, since the core wire fixing material 4 is formed in a bulk shape in this embodiment, peeling of the core wire exposed portions 302 from the core wire fixing material 4 due to thermal stress is suppressed.

[0040] In this embodiment, the electric wire connection structure 1 is used in a medical device to be inserted into the body. That is, each component constituting the electric wire connection structure 1 needs to be configured to be extremely small so that the medical device including the electric wire connection structure 1 can be inserted into the body. In such a case, it is extremely difficult to maintain the spacing between the multiple exposed core wire parts 302, so the electric wire connection structure 1 of this embodiment, which uses the core wire fixing member 4 as described above to enable the spacing between the multiple exposed core wire parts 302 to be maintained, is preferably used.

[0041] The manufacturing method of the electric wire connection structure 1 of this embodiment includes an electric wire fixing step of arranging in parallel the exposed core portions 302 of the core wires 31 of the multiple electric wires 3 exposed from the coating 32 and fixing them with the core wire fixing member 4, and a connection step performed after the electric wire fixing step of connecting the exposed core portions 302 of the multiple electric wires 3 to the multiple electrodes 21 of the electronic component 2, respectively. In this way, with the spacing between the multiple exposed core portions 302 fixed by the core wire fixing member 4, the exposed core portions 302 can be aligned with the multiple electrodes 21, improving the productivity of the electric wire connection structure 1.

[0042] As described above, according to the present embodiment, it is possible to provide an electric wire connection structure and a method for manufacturing the electric wire connection structure that make it easy to maintain the spacing between a plurality of exposed core portions.

[0043] [Second embodiment] A second embodiment of the present invention will be described with reference to Fig. 9. Fig. 9 is a cross-sectional view parallel to the axial direction X and height direction Z of the electric wire connection structure 1.

[0044] In this embodiment, the relative positions of the core wire fixing member 4 and the coating 32 are changed from those of the first embodiment. Specifically, the core wire fixing member 4 is disposed away from the tip surfaces 321 of the coatings 32 of the three electric wires 3. Note that, in this embodiment as well, the core wire fixing member 4 is disposed closer to the tip surface 321 of the coating 32 than the center position C between the electronic component 2 and the tip surface 321 of the coating 32 in the axial direction X. The core wire fixing member 4 covers only the three core wire fixing members 4. A sealant 5 is filled between the core wire fixing member 4 and the tip surfaces 321 of the coatings 32 of the three electric wires 3.

[0045] The other configurations of this embodiment are similar to those of the first embodiment. In addition, among the symbols used in the second and subsequent embodiments, the same symbols as those used in the previously described embodiments represent the same components, etc. as those in the previously described embodiments, unless otherwise specified.

[0046] (Functions and Effects of the Second Embodiment) In this embodiment, the core wire fixing material 4 is spaced apart from the tip surface 321 of the coating 32, and the sealant 5 is filled between the tip surface 321 of the coating 32 of the multiple electric wires 3 and the core wire fixing material 4. In this manner, the sealant 5 having adhesiveness with the coating 32 is also disposed on the tip surface 321 of the coating 32, thereby preventing moisture from reaching the conductive portion of the multiple electric wires 3 from between the sealant 5 and the coating 32. In addition, the second embodiment has the same functions and effects as the first embodiment.

[0047] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiment will be described by using the reference numerals and the like in the embodiment. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiment.

[0048] [1] An electric wire connection structure 1 comprising: a plurality of electric wires 3 having a covering portion 301 in which a core wire 31 is covered with a covering 32 and a core exposed portion 302 in which the core wire 31 is exposed from the covering 32, the core exposed portions 302 being arranged in parallel; an electronic component 2 having a plurality of electrodes 21 to which the core exposed portions 302 of the plurality of electric wires 3 are respectively connected; and a core fixing material 4 that fixes the plurality of core exposed portions 302 together.

[0049] [2] The wire connection structure 1 described in [1], wherein the core wire fixing material 4 is formed by hardening molten resin filled around the multiple exposed core wire portions 302, and is in contact with the tip surface 321 of the coating 32 of at least one of the multiple electric wires 3.

[0050] [3] The electric wire connection structure (1) according to [1] or [2], further comprising a sealant (5) that seals the plurality of electrodes (21), the tip portions of the plurality of electric wires (3), and the core wire fixing material (4).

[0051] [4] The wire connection structure 1 described in [3], wherein at least a portion of the core wire fixing material 4 is arranged on the tip surface 321 side of a center position C between the electronic component 2 and the tip surface 321 of the coating 32 in the longitudinal direction X of each of the core wire exposed portions 302.

[0052] [5] The wire connection structure 1 described in [3] or [4], wherein the coating 32 is made of a fluororesin, and the sealing material 5 seals the coating 32 of the multiple electric wires 3 up to the tips thereof and is made of a material that is adhesive to the fluororesin.

[0053] [6] The wire connection structure 1 described in [5], wherein the core wire fixing material 4 is spaced apart from the tip surfaces 321 of the coatings 32 of the multiple electric wires 3, and the sealing material 5 is filled between the core wire fixing material 4 and the tip surfaces 321 of the coatings 32 of the multiple electric wires 3.

[0054] [7] The wire connection structure 1 described in any one of [1] to [6], wherein the core wire fixing material 4 is formed in a bulk shape with a thickness T equal to or greater than the diameter D of the core wire 31.

[0055] [8] The wire connection structure 1 described in [7], wherein the multiple exposed core wire portions 302 and the multiple electrodes 21 are respectively connected using a conductive bonding material 6 that melts and hardens due to a change in temperature.

[0056] [9] The wire connection structure 1 described in any one of [1] to [8], which is used in a medical device to be inserted into the body.

[0057]

[10] A method for manufacturing an electric wire connection structure 1, comprising: an electric wire fixing step of arranging in parallel exposed core portions 302, in which core wires 31 of a plurality of electric wires 3 are exposed from a coating 32, and fixing them with a core wire fixing material 4; and a connection step, which is performed after the electric wire fixing step, of connecting the exposed core portions 302 of the plurality of electric wires 3 to a plurality of electrodes 21 of an electronic component 2, respectively.

[0058] (Additional Note) Although the embodiment of the present invention has been described above, the invention according to the claims is not limited to the above embodiment. It should be noted that not all of the combinations of features described in the embodiment are essential to the means for solving the problems of the invention. The present invention can be modified appropriately without departing from the spirit of the invention. [Explanation of symbols]

[0059] 1... Wire connection structure 2... Electronic component 21...Electrode 3...Electric wire 301: Covering portion 302: Exposed core portion 31...Core wire 32...Covering 321...Tip surface 4...Core wire fixing material 5... Sealing material 6... Conductive bonding material

Claims

1. a plurality of electric wires each including a covering portion in which a core wire is covered with a covering and an exposed core wire portion in which the core wire is exposed from the covering, the exposed core wire portions being arranged in parallel to each other; an electronic component having a plurality of electrodes to which the exposed core portions of the plurality of electric wires are respectively connected; and a core wire fixing material that fixes the plurality of exposed core wire portions to each other. Wire connection structure.

2. The core wire fixing material is formed by hardening a molten resin filled around the plurality of exposed core wire portions, and is in contact with a tip end surface of the coating of at least one of the plurality of electric wires. The wire connection structure according to claim 1 .

3. The electrode assembly further includes a sealing material that seals the electrodes, the tip portions of the electric wires, and the core wire fixing material. The wire connection structure according to claim 1 .

4. At least a part of the core wire fixing material is disposed on the front end surface side of a center position between the electronic component and the front end surface of the coating in a longitudinal direction of each of the exposed core wire portions. The wire connection structure according to claim 3 .

5. The coating is made of a fluorine-based resin, The sealing material seals the coverings of the electric wires up to their tip portions and is made of a material having adhesiveness with the fluorine-based resin. The wire connection structure according to claim 3 .

6. the core wire fixing member is spaced apart from tip surfaces of the coatings of the plurality of electric wires, The sealing material is filled between the core wire fixing material and the tip surfaces of the coatings of the plurality of electric wires. The wire connection structure according to claim 5 .

7. The core wire fixing material is formed in a bulk shape having a thickness equal to or greater than the diameter of the core wire. The electric wire connection structure according to claim 1 or 2.

8. The plurality of exposed core wire portions and the plurality of electrodes are connected to each other using a conductive bonding material that melts and hardens due to a change in temperature. The wire connection structure according to claim 7.

9. Used in medical devices inserted into the body, The electric wire connection structure according to claim 1 or 2.

10. an electric wire fixing process in which exposed core portions of the plurality of electric wires, in which the cores of the electric wires are exposed from the coating, are arranged in parallel and fixed by a core wire fixing material; a connecting step, which is carried out after the electric wire fixing step, of connecting the exposed core wire portions of the plurality of electric wires to a plurality of electrodes of an electronic component, respectively. A method for manufacturing an electric wire connection structure.

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