JP2010257687A - Coiled electric wire - Google Patents

Coiled electric wire Download PDF

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JP2010257687A
JP2010257687A JP2009105030A JP2009105030A JP2010257687A JP 2010257687 A JP2010257687 A JP 2010257687A JP 2009105030 A JP2009105030 A JP 2009105030A JP 2009105030 A JP2009105030 A JP 2009105030A JP 2010257687 A JP2010257687 A JP 2010257687A
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electric wire
coiled electric
coiled
wire
outer periphery
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Osamu Matsumoto
修 松本
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Junkosha Co Ltd
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Junkosha Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-resistance and durable coiled electric wire. <P>SOLUTION: In the coiled electric wire 1, a plurality of baselines 2 are placed side by side for formation in a coil shape. The baselines 2 include: a center material 11 made of a high-tension spring material; a plurality of outer members 12 made of a material having low electric resistivity twisted on an outer periphery of the center material; and a covering 13 provided on an outer periphery of the outer member 12. By configuring the coiled electric wire 1 in this manner, the coiled electric wire 1 having resistance lower than and durability higher than that of a conventional coiled electric wire can be provided. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、医療分野においてインプラントに使用され、あるいは小型ロボット分野において狭小のスペースで使用される極細のコイル状電線に関する。   The present invention relates to an extremely fine coiled electric wire used for an implant in the medical field or used in a small space in a small robot field.

例えば、心臓に周期的な電気刺激を与えて心拍動を起こさせるペースメーカに用いられる電線や、手足の動きを補助する小型ロボットに用いられる電線は、配線部位の動作に合わせて伸縮可能であることは勿論、低抵抗かつ高張力であることが要求される。この理由は、低抵抗でないとバッテリに接続されたときに発熱ロスが大きくてバッテリ等が短寿命となるおそれがあり、高張力でないと引張りや曲げの繰り返しにより断線するおそれがあり、結局、電線等の耐久性が低下する要因となるからである。   For example, wires used in pacemakers that cause heartbeats by applying periodic electrical stimulation to the heart, and wires used in small robots that assist the movement of limbs, can be expanded and contracted according to the movement of the wiring site. Of course, low resistance and high tension are required. The reason for this is that if the resistance is not low, the heat loss will be large when connected to the battery and the battery will have a short life.If the tension is not high, there is a risk of disconnection due to repeated pulling and bending. This is because the durability such as the above becomes a factor of lowering.

このような電線として、特許文献１には、複数本の電線（以下、基線という）を並列配置してコイル状に形成したコイル状電線が開示されている。基線は、銀や銅等でなる中心材の外周にステンレスやコバルト基合金等でなる外部材が一体化されたクラッド構造体と、このクラッド構造体の外周を被覆するフッ素樹脂等でなる絶縁コーティング層とで構成されている。このような基線を複数本並列配置してコイル状に形成しているので伸縮可能となり、中心材を銀や銅等で形成しているので低抵抗となり、外部材をステンレスやコバルト基合金等で形成しているので高張力となる。これにより、コイル状電線等の耐久性を高めることができるというものである。   As such an electric wire, Patent Document 1 discloses a coiled electric wire in which a plurality of electric wires (hereinafter referred to as a base line) are arranged in parallel to form a coil shape. The base line is a clad structure in which an outer member made of stainless steel or a cobalt base alloy or the like is integrated on the outer periphery of a central material made of silver, copper, or the like, and an insulating coating made of fluororesin that covers the outer periphery of the clad structure It consists of layers. Since a plurality of such base lines are arranged in parallel and formed into a coil shape, it can be expanded and contracted, and since the center material is formed of silver, copper, etc., the resistance is low, and the outer member is made of stainless steel, cobalt base alloy, etc. Since it is formed, it becomes high tension. Thereby, durability, such as a coil-shaped electric wire, can be improved.

特開平１１−３３３０００号公報JP 11-333000 A

しかし、近年、特に生体内で使用するコイル状電線の分野では、バッテリの寿命、電線の耐久性の観点から、より低抵抗、高耐久性のものが要求されていた。   However, in recent years, particularly in the field of coiled electric wires used in vivo, those with lower resistance and higher durability have been required from the viewpoint of battery life and electric wire durability.

本発明は、上記のような課題に鑑みなされたものであり、その目的は、従来のコイル状電線よりもはるかに低抵抗、高耐久性となるコイル状電線を提供することにある。   This invention is made | formed in view of the above subjects, The objective is to provide the coiled electric wire which becomes much low resistance and high durability rather than the conventional coiled electric wire.

上記目的達成のため、本発明のコイル状電線では、複数本の基線を並設してコイル状に形成したコイル状電線であって、前記基線が、高張力バネ材で成る中心材と、該中心材の外周に撚り合わされた低電気抵抗率材で成る複数本の外部材と、該外部材の外周に設けられた外被とを有することを特徴としている。   To achieve the above object, the coiled electric wire of the present invention is a coiled electric wire formed in a coil shape by arranging a plurality of base lines, wherein the base line is a central member made of a high-tension spring material, It is characterized by having a plurality of outer members made of a low electrical resistivity material twisted around the outer periphery of the central member, and a jacket provided on the outer periphery of the outer member.

即ち、本発明者は、中心材を高張力バネ材とし、外周に低電気抵抗率材を撚り合わせることで、コイル状電線が従来のコイル状電線よりもはるかに低抵抗となることを見い出した。さらに、外部材は中心材と分離されており、更に複数本の外部材が中心材の外周に螺旋状に巻回されているので、基線の屈曲時や伸縮時には外部材は中心材に引っ張られることなく単独で屈曲および伸縮する。したがって、外部材の断線を防止することができる。即ち、従来のコイル状電線よりもはるかに高耐久性となる。中心材としては、２０００ＭＰａ以上の高張力バネ材、外部材としては、２．1Ω・ｃｍ以下の低電気抵抗率材を使用することが望ましい。   That is, the present inventor has found that the coiled wire has a much lower resistance than the conventional coiled wire by using a high tension spring material as the center material and twisting a low electrical resistivity material on the outer periphery. . Furthermore, since the outer member is separated from the central member, and a plurality of outer members are spirally wound around the outer periphery of the central member, the outer member is pulled by the central member when the base line is bent or stretched. It bends and stretches alone without any problems. Therefore, disconnection of the outer member can be prevented. That is, it becomes much more durable than the conventional coiled electric wire. It is desirable to use a high tension spring material of 2000 MPa or more as the central material and a low electrical resistivity material of 2.1 Ω · cm or less as the outer member.

本発明の実施形態に係るコイル状電線を電線軸と直交する方向から見た平面図である。It is the top view which looked at the coiled electric wire which concerns on embodiment of this invention from the direction orthogonal to an electric wire axis. 図１のコイル状電線の基線を電線軸方向から見た拡大図である。It is the enlarged view which looked at the base line of the coil-shaped electric wire of FIG. 1 from the electric wire axial direction. 基線の外被の耐摩耗性を試験するための耐摩耗性試験電線を電線軸方向から見た拡大図である。It is the enlarged view which looked at the abrasion resistance test electric wire for testing the abrasion resistance of the jacket of a base line from the electric wire axial direction. 基線の外被の耐摩耗性を試験する耐摩耗性試験装置の構成を示す図である。It is a figure which shows the structure of the abrasion resistance test apparatus which tests the abrasion resistance of the jacket of a base line.

以下に説明する実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態の中で説明されている特徴の組み合わせの全てが本発明の成立に必須であるとは限らない。   The embodiments described below do not limit the invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential for the establishment of the present invention.

図１は、本発明の実施形態に係るコイル状電線を電線軸と直交する方向から見た平面図、図２は、図１のコイル状電線の基線を電線軸方向から見た拡大図である。このコイル状電線１は、４本の基線２１〜２４を並べたものを、更に螺旋状（コイル状）に巻いた構成となっている。コイル状電線１は、医療分野においてインプラントに使用され、あるいは小型ロボット分野において狭小のスペースで使用される。インプラント分野では、電線が細径であり（例えば０．２８ｍｍの外径）、柔軟性が求められる。   FIG. 1 is a plan view of a coiled electric wire according to an embodiment of the present invention as viewed from a direction orthogonal to the electric wire axis, and FIG. 2 is an enlarged view of the base line of the coiled electric wire of FIG. . This coiled electric wire 1 has a configuration in which four base lines 21 to 24 are arranged in a spiral shape (coiled). The coiled electric wire 1 is used for an implant in the medical field, or is used in a small space in the small robot field. In the implant field, the electric wire has a small diameter (for example, an outer diameter of 0.28 mm), and flexibility is required.

各基線２１〜２４は、高張力バネ材で成る中心材１１と、該中心材１１の外周に撚り合わされた低電気抵抗率材で成る複数本の外部材１２と、該外部材１２の外周に設けられた外被１３とを有する。中心材１１としては、２０００ＭＰａ以上の張力を有する高張力バネ材であれば良く、例えばマルテンサイト系のステンレス鋼（例えばＳＵＳ３０４）やピアノ線等の高炭素鋼が使用可能である。外部材１２としては、２．1Ω・ｃｍ以下の電気抵抗率を有する低電気抵抗率材であれば良く、例えば銀メッキ銀入り銅合金や銅等が使用可能である。外被１３としては、耐摩耗性材であれば良く、例えば母材としてエチレン−テトラフルオロエチレン共重合体（ＥＴＦＥ）等に、充填材として１０μｍ以下の粒子径を有し、母材よりも動摩擦係数が小さい微小粒状のポリテトラフルオロエチレン（ＰＴＦＥ）、微小粒状の鱗状黒鉛、微小粒状のアラミド樹脂等を充填した複合材が使用可能である。   Each of the base lines 21 to 24 includes a center member 11 made of a high tension spring material, a plurality of outer members 12 made of a low electrical resistivity material twisted around the outer periphery of the center member 11, and an outer periphery of the outer member 12. And an outer cover 13 provided. The center material 11 may be a high tension spring material having a tension of 2000 MPa or more. For example, martensitic stainless steel (for example, SUS304) or high carbon steel such as piano wire can be used. The external material 12 may be a low electrical resistivity material having an electrical resistivity of 2.1 Ω · cm or less. For example, a silver-plated silver-containing copper alloy or copper can be used. The outer jacket 13 may be any wear-resistant material. For example, ethylene-tetrafluoroethylene copolymer (ETFE) or the like as a base material has a particle diameter of 10 μm or less as a filler, and dynamic friction is larger than that of the base material. A composite material filled with fine granular polytetrafluoroethylene (PTFE) having a small coefficient, fine granular scale graphite, fine granular aramid resin, or the like can be used.

このような構成のコイル状電線１は、従来のコイル状電線よりもはるかに低抵抗となる。さらに、コイル状電線１は、従来のコイル状電線のように中心材と外部材とが一体化されたクラッド構造体ではなく、外部材１２は中心材１１と分離された構造であり、更に複数本の外部材１２が中心材１１の外周に螺旋状に巻回されている。このため、基線２１〜２４の屈曲時や伸縮時には外部材１２は中心材１１に引っ張られることなく単独で屈曲および伸縮するので、外部材１２の断線を防止することができる。即ち、コイル状電線１は、従来のコイル状電線よりもはるかに高耐久性となる。そして、中心材１１と外部材１２は個々に独立しているため、必要とする張力や電気抵抗率を有する最適な材料を選択することができ、材料選択肢の幅を広げることができる。   The coiled electric wire 1 having such a configuration has a much lower resistance than a conventional coiled electric wire. Further, the coiled electric wire 1 is not a clad structure in which the central member and the outer member are integrated as in the conventional coiled electric wire, and the outer member 12 has a structure separated from the central member 11, and more A book outer member 12 is spirally wound around the outer periphery of the central member 11. For this reason, when the base lines 21 to 24 are bent or stretched, the outer member 12 is bent and stretched independently without being pulled by the center member 11, so that the disconnection of the outer member 12 can be prevented. That is, the coiled electric wire 1 has much higher durability than the conventional coiled electric wire. Since the central member 11 and the outer member 12 are independent of each other, it is possible to select an optimal material having the necessary tension and electrical resistivity, and to widen the range of material options.

また、外被１３は母材がフッ素樹脂であるため、薄肉であっても、生体適合性、耐摩耗性、耐薬品性および耐油性に優れているが、更に、充填材自体の摩擦係数が低く潤滑性に優れているので、耐摩耗性を更に向上させることができる。また、母材の肉厚を５０μｍ以下としても、充填材の粒子径は１０μｍ以下であるため、充填材は母材を突き抜けることなく母材中に埋め込まれるので、ピンホールの発生を抑えて絶縁破壊を防止することができる。即ち、基線２同士の摩擦による摩耗によって絶縁破壊が発生することを防止することができる。   Moreover, since the base material of the outer cover 13 is a fluororesin, even if it is thin, it has excellent biocompatibility, wear resistance, chemical resistance and oil resistance. Since it is low and excellent in lubricity, the wear resistance can be further improved. Even if the thickness of the base material is 50 μm or less, since the filler particle diameter is 10 μm or less, the filler is embedded in the base material without penetrating the base material. Destruction can be prevented. That is, it is possible to prevent dielectric breakdown from occurring due to wear caused by friction between the base lines 2.

次に、実施例として本実施形態のコイル状電線１を作製し、張力測定および電気抵抗率測定を行ったので該測定結果について説明する。   Next, since the coiled electric wire 1 of this embodiment was produced as an example and the tension measurement and the electrical resistivity measurement were performed, the measurement results will be described.

ここで、張力測定および電気抵抗率測定に使用した実施例のコイル状電線１は、以下のようにして作製されている。中心材１１として外径０．０６ｍｍのＳＵＳ３０４のステンレス線を用意し、この中心材１１の外周に外部材１２として外径０．０３ｍｍの銀メッキ銀入り銅合金の合金線を９本撚り合わせ、その外周に平均粒子径が０．１μｍ〜０．５μｍのＰＴＦＥを３ｗｔ％充填したＥＴＦＥを２０μｍ押出し被覆して基線２とし、作成した基線２を４本並べて螺旋巻きし、最終的に外径Ｄが０．６２ｍｍのコイル状電線１とする。   Here, the coiled electric wire 1 of the Example used for tension measurement and electrical resistivity measurement is produced as follows. A stainless steel wire of SUS304 having an outer diameter of 0.06 mm is prepared as the central member 11, and nine alloy wires of silver-plated silver-containing copper alloy having an outer diameter of 0.03 mm are twisted around the outer periphery of the central member 11. ETFE filled with 3 wt% of PTFE having an average particle diameter of 0.1 μm to 0.5 μm on its outer periphery is extruded and coated to 20 μm to form a base line 2, and four created base lines 2 are arranged side by side and spirally wound. Is a coiled electric wire 1 of 0.62 mm.

このコイル状電線１に使用される金属部分（中心材１１に外部材１２を巻いたもの）の電気抵抗率は室温２０°Ｃで２．６μΩ・ｃｍ以下となり、引張り強さは１２１０ＭＰａ以上となる。これに対し従来のＤＦＴワイヤでは、電気抵抗率が室温２０°Ｃで４．２μΩ・ｃｍとなり、引張り強さは１０９１ＭＰａとなる。したがって、コイル状電線１の金属部分は、従来のＤＦＴワイヤよりも電気抵抗率で３８％以上低減し、引張り強さで１０％以上向上する。よって、コイル状電線１は、従来のコイル状電線よりも低抵抗、高張力（高耐久性）となる。   The electrical resistivity of the metal portion used for the coiled electric wire 1 (the core member 11 wrapped with the outer member 12) is 2.6 μΩ · cm or less at room temperature of 20 ° C., and the tensile strength is 1210 MPa or more. . On the other hand, the conventional DFT wire has an electric resistivity of 4.2 μΩ · cm at a room temperature of 20 ° C. and a tensile strength of 1091 MPa. Therefore, the metal portion of the coiled electric wire 1 is reduced by 38% or more in electrical resistivity and improved by 10% or more in tensile strength as compared with the conventional DFT wire. Therefore, the coiled electric wire 1 has lower resistance and higher tension (high durability) than the conventional coiled electric wire.

次に、実施例として本実施形態のコイル状電線１に使用可能な材料で成る外被１３および比較例として従来のコイル状電線に使用された材料で成る外被の耐摩耗性試験を行ったので図３および図４を参照して耐摩耗性試験電線および耐摩耗性試験装置を説明してから試験結果について説明する。   Next, an abrasion resistance test was performed on the outer sheath 13 made of a material usable for the coiled electric wire 1 of the present embodiment as an example and the outer sheath made of a material used for a conventional coiled electric wire as a comparative example. Therefore, the test results will be described after the description of the wear resistance test wire and the wear resistance test apparatus with reference to FIG. 3 and FIG.

図３に示すように、耐摩耗性試験に使用した耐摩耗性試験電線３０は、外径０．０３ｍｍの錫メッキ錫入り銅合金の合金線３１を７本撚り合わせ、その電線を７本撚り合わせ、該電線束の外周に押出機により外被３２を厚さ４５μｍで被覆した構成となっている。実施例の外被３２の材料は、母材としてのＥＴＦＥに、充填材として粒子径０．２μｍのＰＴＦＥ、粒子径３μｍの鱗状黒鉛、粒子径５μｍのアラミド樹脂のうちからいずれか１つを充填した複合材である。   As shown in FIG. 3, the abrasion resistance test electric wire 30 used for the abrasion resistance test is formed by twisting seven alloy wires 31 of a tin-plated tin-containing copper alloy having an outer diameter of 0.03 mm, and twisting the seven wires. In addition, the outer periphery of the wire bundle is covered with a jacket 32 with a thickness of 45 μm by an extruder. The material of the jacket 32 of the embodiment is filled with ETFE as a base material, any one of PTFE having a particle diameter of 0.2 μm, scaly graphite having a particle diameter of 3 μm, and an aramid resin having a particle diameter of 5 μm as a filler. Composite material.

ここで、母材に充填する充填材の充填量は、ＰＴＦＥで３ｗｔ％以下、鱗状黒鉛で５ｗｔ％以下、アラミド樹脂で１ｗｔ％以下であればよい。この理由は、例えばピンホールの試験のために５００Ｖのスパーク電圧をかけてスパークが発生しないときの充填量が、ＰＴＦＥで３ｗｔ％以下、鱗状黒鉛で５ｗｔ％以下、アラミド樹脂で１ｗｔ％以下となったからである。なお、スパークの実験で用いた電線は、外径０．１６ｍｍの錫メッキ錫入り銅合金の合金線に、上記の充填材を充填したＥＴＦＥで厚さ２０μｍの外被を形成したものである。   Here, the filling amount of the filler to be filled in the base material may be 3 wt% or less for PTFE, 5 wt% or less for scaly graphite, and 1 wt% or less for aramid resin. This is because, for example, when a spark voltage of 500 V is applied for a pinhole test and the spark is not generated, the filling amount is 3 wt% or less for PTFE, 5 wt% or less for scaly graphite, and 1 wt% or less for aramid resin. This is because the. In addition, the electric wire used in the spark experiment was formed by forming an outer sheath with a thickness of 20 μm with ETFE filled with the above filler on an alloy wire of a tin-plated tin-containing copper alloy having an outer diameter of 0.16 mm.

図４に示すように、耐摩耗性試験に使用した耐摩耗性試験装置４０（東洋精機製作所製）は、試験台４１、ビーズ針４２、可動部４３および導通検出回路４４を備えている。試験台４１上には、耐摩耗性試験電線３０が直線状態で載置されるようになっている。ビーズ針４２は、導電性金属により円柱棒状に形成されている。可動部４３は、導電性金属で作製されており、試験台４１の上方にて垂直往復直線移動可能であって水平往復直線移動可能なように配置されている。そして、可動部４３の下部には、ビーズ針４２が軸を水平方向であって水平往復直線移動方向と直交する方向を向くようにして取り付けられている。導通検出回路４４は、試験電線３０の合金線３１と可動部４３とに電気的に接続されて両者の導通を検出するようになっている。   As shown in FIG. 4, the wear resistance test apparatus 40 (manufactured by Toyo Seiki Seisakusho) used for the wear resistance test includes a test table 41, a bead needle 42, a movable portion 43, and a continuity detection circuit 44. On the test stand 41, the wear resistance test electric wire 30 is placed in a straight line state. The bead needle 42 is formed in a cylindrical rod shape from a conductive metal. The movable portion 43 is made of a conductive metal, and is arranged so as to be vertically reciprocal linearly movable above the test table 41 and horizontally reciprocally linearly moveable. And the bead needle 42 is attached to the lower part of the movable part 43 so that the axis | shaft may turn to the direction orthogonal to a horizontal direction and a horizontal reciprocating linear movement direction. The continuity detection circuit 44 is electrically connected to the alloy wire 31 and the movable portion 43 of the test electric wire 30 to detect continuity between the two.

このような構成の耐摩耗性試験装置４０により耐摩耗性試験を行う際は、試験台４１上に耐摩耗性試験電線３０を載置固定する。即ち、耐摩耗性試験電線３０の合金線３１が外径１．０ｍｍのビーズ針４２の軸と直交する方向に延在するように、かつ耐摩耗性試験電線３０の外被３２がビーズ針４２の中央部と当接可能なように固定する。そして、１Ｎの可動部４３を下降させてビーズ針４２の中央部を試験台４１上の耐摩耗性試験電線３０の外被３２に当接させる。この状態で、可動部４３を１０ｍｍのストロークで６０回／分の速度で水平往復動させてビーズ針４２の中央部を耐摩耗性試験電線３０の外被３２上で摺動させ、導通検出回路４４で導通が検出されるまでの往復回数を測定する。なお、試験電線３０のサンプル数は、各１０本とした。   When the abrasion resistance test is performed by the abrasion resistance test apparatus 40 having such a configuration, the abrasion resistance test electric wire 30 is placed and fixed on the test table 41. That is, the alloy wire 31 of the wear resistance test wire 30 extends in a direction orthogonal to the axis of the bead needle 42 having an outer diameter of 1.0 mm, and the jacket 32 of the wear resistance test wire 30 is the bead needle 42. It is fixed so that it can contact the center of Then, the 1N movable portion 43 is lowered to bring the central portion of the bead needle 42 into contact with the jacket 32 of the wear resistance test wire 30 on the test table 41. In this state, the movable portion 43 is horizontally reciprocated at a speed of 60 mm / min with a stroke of 10 mm, and the central portion of the bead needle 42 is slid on the outer sheath 32 of the wear resistance test electric wire 30 to thereby detect the continuity. At 44, the number of reciprocations until continuity is detected is measured. In addition, the sample number of the test electric wire 30 was 10 pieces each.

試験結果としては、比較例のＰＦＡのみの外被３２の場合は平均３４回、ＥＴＦＥのみの外被３２の場合は平均１６２回であったのに対し、実施例の３ｗｔ％のＰＴＦＥの外被３２の場合は平均５９４８回、５ｗｔ％の鱗状黒鉛の外被３２の場合は平均１２３３回、１ｗｔ％のアラミド樹脂の外被３２の場合は平均２２４５回となった。ＰＦＡのみの外被３２の場合およびＥＴＦＥのみの外被３２の場合と比較して、３ｗｔ％のＰＴＦＥの外被３２の場合は１７４．９倍および３６．７倍、５ｗｔ％の鱗状黒鉛の外被３２の場合は３６．３倍回および７．６倍、１ｗｔ％のアラミド樹脂の外被３２の場合は６６．０倍および１３．８倍と耐摩耗性を向上させることができ、特に３ｗｔ％のＰＴＦＥの外被３２の場合に大幅に向上させることができた。   As a result of the test, in the case of the PFA-only jacket 32 of the comparative example, the average was 34 times, and in the case of the ETFE-only jacket 32, the average was 162 times, whereas the 3 wt% PTFE jacket of the example was used. In the case of 32, the average was 5948 times, and in the case of 5 wt% scaly graphite envelope 32, the average was 1233 times, and in the case of 1 wt% aramid resin envelope 32, the average was 2245 times. Compared to the case of the PFA-only jacket 32 and the case of the ETFE-only jacket 32, the 3wt% PTFE jacket 32 is 174.9 times and 36.7 times the outer surface of the 5wt% scaly graphite. In the case of the covering 32, the wear resistance can be improved by 36.3 times and 7.6 times, and in the case of the 1 wt% aramid resin covering 32, 66.0 times and 13.8 times, especially 3 wt. In the case of the PTFE jacket 32%, it was possible to improve significantly.

なお、充填材としてのＰＴＦＥに関しては、更に実験を行った結果、平均粒径が０．１μｍ〜０．５μｍ、充填量が２ｗｔ％〜５ｗｔ％において、耐摩耗性を大幅に向上させることができた。充填量が２ｗｔ％未満の場合は、耐摩耗性が不足するからであり、充填量が５ｗｔ％を超える場合は、絶縁破壊が発生し易くなるからである。また、母材としてのＥＴＦＥに関しては、充填材を充填したときに、流動性（ＭＦＲ（Ｍｅｌｔ Ｆｌｏｗ Ｒａｔｅ））が５ｇ／１０ｍｉｎ〜３５ｇ／１０ｍｉｎあれば良い。   In addition, regarding PTFE as a filler, as a result of further experiments, the wear resistance can be significantly improved when the average particle size is 0.1 μm to 0.5 μm and the filling amount is 2 wt% to 5 wt%. It was. This is because the wear resistance is insufficient when the filling amount is less than 2 wt%, and the dielectric breakdown is likely to occur when the filling amount exceeds 5 wt%. Further, regarding ETFE as a base material, it is sufficient that the fluidity (MFR (Melt Flow Rate)) is 5 g / 10 min to 35 g / 10 min when the filler is filled.

上述した実施形態では、コイル状電線１の基線２は４本並設した構成としたが、基線２を２本〜１０本並設、更には１０本以上並設したコイル状電線としても良い。また、外部材１２は９本撚り合わせたが、中心材１１の周囲に撚り合わせ可能であれば外部材１２の撚りあわせ本数は特に限定されるものではない。   In the above-described embodiment, the four base lines 2 of the coiled electric wire 1 are arranged side by side. However, two to ten base lines 2 may be arranged side by side, and further, coiled electric wires may be arranged in parallel with ten or more. Although nine outer members 12 are twisted together, the number of twisted outer members 12 is not particularly limited as long as the outer member 12 can be twisted around the center member 11.

本発明のコイル状電線は、極細であるため、例えば、内視鏡のような医療分野、小型携帯コンピュータ、携帯電話等の小型電子機器に適用可能である。   Since the coiled electric wire of the present invention is extremely thin, it can be applied, for example, to medical fields such as endoscopes, small electronic devices such as small portable computers and mobile phones.

１ コイル状電線、２、２１〜２４ 基線、１１ 中心材、１２ 外部材、１３、３２ 外被、３０ 耐摩耗性試験電線、３１ 合金線、４０ 耐摩耗性試験装置、４１ 試験台、４２ ビーズ針、４３ 可動部、４４ 導通検出回路 DESCRIPTION OF SYMBOLS 1 Coiled electric wire, 2, 21-24 Base line, 11 Center material, 12 Outer material, 13, 32 Outer sheath, 30 Abrasion resistance test electric wire, 31 Alloy wire, 40 Abrasion resistance test apparatus, 41 Test stand, 42 Beads Needle, 43 Movable part, 44 Continuity detection circuit

Claims (2)

複数本の基線を並設してコイル状に形成したコイル状電線であって、
前記基線が、高張力バネ材で成る中心材と、
該中心材の外周に撚り合わされた低電気抵抗率材で成る複数本の外部材と、
該外部材の外周に設けられた外被とを有することを特徴とするコイル状電線。 A coiled electric wire formed in a coil shape by arranging a plurality of base lines,
The base line is a central member made of a high tension spring material,
A plurality of outer members made of a low electrical resistivity material twisted around the outer periphery of the central material;
A coiled electric wire having a jacket provided on an outer periphery of the outer member. 前記中心材は、２０００ＭＰａ以上の高張力バネ材で成り、前記外部材は、２．1Ω・ｃｍ以下の低電気抵抗率材で成ることを特徴とする請求項１に記載のコイル状電線。   2. The coiled electric wire according to claim 1, wherein the central member is made of a high tension spring material of 2000 MPa or more, and the outer member is made of a low electrical resistivity material of 2.1 Ω · cm or less.
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