WO2016121000A1 - 同軸ケーブル及び医療用ケーブル - Google Patents
同軸ケーブル及び医療用ケーブル Download PDFInfo
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- WO2016121000A1 WO2016121000A1 PCT/JP2015/052196 JP2015052196W WO2016121000A1 WO 2016121000 A1 WO2016121000 A1 WO 2016121000A1 JP 2015052196 W JP2015052196 W JP 2015052196W WO 2016121000 A1 WO2016121000 A1 WO 2016121000A1
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- insulating
- coaxial cable
- cable according
- conductor
- central conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1834—Construction of the insulation between the conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1808—Construction of the conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1808—Construction of the conductors
- H01B11/183—Co-axial cables with at least one helicoidally wound tape-conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1834—Construction of the insulation between the conductors
- H01B11/1847—Construction of the insulation between the conductors of helical wrapped structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1834—Construction of the insulation between the conductors
- H01B11/1856—Discontinuous insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0208—Cables with several layers of insulating material
Definitions
- the present invention relates to a coaxial cable and a medical cable.
- Medical cables include probe cables, catheter cables, endoscope cables, etc., and coaxial cables are used as signal lines.
- a coaxial cable built in such a medical cable a coaxial cable having a foam insulating layer formed by foam extrusion coating on the outer periphery of a center conductor is conventionally known (see, for example, Patent Documents 1 and 2). ). By having bubbles due to foaming, the capacitance of the insulating layer can be lowered.
- Medical cables are required to have a smaller diameter as the medical device becomes smaller. Along with this, coaxial cables tend to have a smaller diameter.
- Patent Document 3 discloses a coaxial cable that is not for medical use, but surrounds a linear inner conductor with an insulating member, and surrounds the insulating member with an outer conductor.
- a coaxial cable is disclosed in which the insulating member includes an insulating cord twisted around the inner conductor.
- the coaxial cable is reduced in diameter, it may not be able to withstand the pressure for foaming and the conductor may be cut.
- the resin being extruded is interrupted at the foam formation part, and the foam insulation layer exists on the conductor. There is a risk that a region that will not be formed is formed.
- an object of the present invention is to provide a coaxial cable having a novel insulating layer that can perform the same function as the foamed insulating layer without providing the foamed insulating layer, and a medical cable using the coaxial cable. It is in.
- the present invention provides the following coaxial cable and medical cable.
- a plurality of insulating stranded wires or a plurality of insulating yarns obtained by twisting a plurality of insulating yarns are wound around an outer periphery of a center conductor, and the insulating stranded wires or the insulating yarns are wound on the insulating stranded wires or the insulating yarns.
- the coaxial cable which provided the coating layer for forming a space
- the coating layer is formed by winding a polyethylene terephthalate (PET) tape, a polyetherimide (PEI) tape or a polyimide (PI) tape with a hot-melt adhesive layer.
- PET polyethylene terephthalate
- PEI polyetherimide
- PI polyimide
- the coaxial cable according to one.
- the center conductor is a stranded wire, and the insulating yarn is wound around the center conductor in a direction opposite to the twist direction of the center conductor.
- the covering layer is formed by winding a tape, and the tape is wound in a direction opposite to a winding direction of the insulating twisted wire or the insulating yarn.
- a medical cable having a cable core comprising one or more coaxial cables according to any one of [1] to [15].
- a coaxial cable provided with a novel insulating layer capable of exhibiting the same function as the foamed insulating layer without providing the foamed insulating layer, and a medical cable using the coaxial cable.
- FIG. 1 is a cross-sectional view showing the structure of a coaxial cable according to a first embodiment of the present invention.
- a coaxial cable 10 according to the first embodiment of the present invention shown in FIG. 1 has a configuration in which a plurality of insulating twisted wires 2 obtained by twisting a plurality of insulating yarns 2 a are wound around the outer periphery of a central conductor 1.
- the coaxial cable 10 has a coating layer 3 having insulating properties on a plurality of insulating stranded wires 2 wound around the outer periphery of the central conductor 1, and a layer made of the external conductor 4 is provided on the outer periphery of the coating layer 3. Further, a jacket 5 is coated on the outer periphery thereof.
- the covering layer 3 is a layer provided to form a gap with the insulating stranded wire 2.
- the central conductor 1 may be composed of a single wire, but is preferably composed of a stranded wire obtained by twisting a plurality of strands 1a from the viewpoint of increasing the porosity between the insulating conductor 2 and the center conductor 1.
- the number of strands 1a to be twisted is not particularly limited, but is preferably 3 or 7 from the viewpoint of increasing the porosity between the insulating strands 2a. In FIG. 1, seven strands 1a are twisted together.
- the center conductor 1 is made of, for example, a copper alloy. Plating such as silver plating may be applied.
- the center conductor 1 preferably has a small diameter, specifically 42 to 50 AWG (American Wire Gauge), more preferably 46 to 50 AWG, and still more preferably 48 to 50 AWG. The smaller the diameter, the more difficult it is to form the foamed insulation coating layer by extrusion, which is a conventional method, and the smaller the diameter, the higher the value of the present invention.
- the insulating stranded wire 2 is formed by twisting a plurality of insulating yarns 2a. Compared with the case where a single insulating thread described later is used (second embodiment), the void ratio between the central conductor 1 and the covering layer 3 can be further increased. preferable.
- the number of insulating yarns 2 a to be twisted is not particularly limited, but may be two or three from the viewpoint of increasing the porosity between the central conductor 1 and the coating layer 3. preferable. In FIG. 1, three insulating yarns 2a are twisted together.
- the diameter of the insulating stranded wire 2 is preferably 30 to 100 ⁇ m.
- the insulating yarn 2a constituting the insulating stranded wire 2 is, for example, a filament made of a fluororesin.
- a fluororesin for example, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) (for example, trade name FFY manufactured by Gunze) is preferable.
- PFA tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer
- it may be a monofilament or a multifilament, it is preferably a monofilament from the viewpoint of maintaining the shape of the stranded wire 2 and maintaining a gap between layers.
- the cross-sectional shape of the insulating yarn 2a is not particularly limited, and various shapes can be used.
- the plurality of insulating stranded wires 2 are wound immediately above the center conductor 1 in terms of increasing the porosity directly above the center conductor 1.
- Insulating stranded wires 2 are preferably wound around the outer periphery of the center conductor 1 in an amount of 3 to 8 from the viewpoint of increasing the porosity between the center conductor 1 and the covering layer 3. In FIG. 1, eight insulating twisted wires 2 are wound.
- the insulating stranded wire 2 may be wound around the outer periphery in the reverse direction.
- the insulating stranded wire 2 is preferably wound around the central conductor 1 in a direction opposite to the twist direction of the strand 1a of the central conductor 1. That is, it is preferable that the twisting direction or winding direction is alternately reversed, and the twisting direction or winding direction in the same direction is not continued.
- the twisting direction of the insulating yarn 2a may be either direction, but the direction opposite to the twisting direction of the strand 1a of the center conductor 1 is more preferable in terms of increasing the porosity.
- the coating layer 3 has a tubular shape, and is formed, for example, by extruding a resin selected from a fluororesin, polyethylene (PE), and polypropylene (PP).
- a resin selected from a fluororesin, polyethylene (PE), and polypropylene (PP).
- the fluororesin for example, tetrafluoroethylene / ethylene copolymer (ETFE), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), and tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA) are suitable. is there.
- the thickness of the coating layer 3 by extrusion coating is preferably 8 to 30 ⁇ m.
- the covering layer 3 may be formed by winding a polyethylene terephthalate (PET) tape, a polyetherimide (PEI) tape or a polyimide (PI) tape with a hot melt adhesive layer.
- the hot melt adhesive layer is a layer made of a hot melt adhesive that can be bonded by thermocompression bonding.
- the tape is preferably wound so that there is a wrap portion, and is preferably wound in the direction opposite to the winding direction of the insulating strand 2 immediately below.
- the thickness of the hot melt adhesive layer is, for example, 0.5 to 2 ⁇ m, and the thickness of the tape made of each substrate is, for example, 2 to 6 ⁇ m.
- the material of the coating layer 3 is preferably a hard material so that the coating layer 3 does not fall into the inside and crush the gap between the insulating stranded wires 2.
- the porosity in the cross-sectional area of the cable based on the gap (mainly the gap between the insulating twisted wire 2 and the central conductor 1 or the covering layer 3) existing on the side of the central conductor 1 from the covering layer 3 is 30 to 60%. It is preferable that it is 40 to 55%.
- the porosity can be measured, for example, by the following method. ⁇ Measurement method of porosity> A cable semi-finished product composed of a central conductor, an insulating stranded wire, and a covering layer is placed and hardened in a thermosetting resin such as an epoxy resin, and then the cross section is polished with abrasive grains.
- the area of the center conductor, the insulating stranded wire, and the coating layer is measured from the polished cross-sectional image.
- the difference between the total area and the area of the circle whose diameter is the outer diameter of the coating layer (the outer diameter of the semi-finished cable product) is the area of the air gap.
- the porosity can be obtained by calculating the ratio of the area of the void to the area of the circle having the outer diameter of the coating layer as the diameter.
- the outer conductor 4 is, for example, a tin-plated copper wire, a tin-plated copper alloy wire, a silver-plated copper wire, or a silver-plated copper alloy wire.
- a large number of these (for example, 30 to 60) are spirally wound around the outer periphery of the coating layer 3 at a predetermined pitch.
- the covering layer 3 is made of a winding tape, the covering layer 3 is wound in a direction opposite to the winding direction of the covering layer 3.
- the jacket 5 can be provided by winding a PET tape or by extruding ETFE, FEP, PFA or the like.
- FIG. 2 is a cross-sectional view showing the structure of the coaxial cable according to the second embodiment of the present invention.
- a coaxial cable 20 according to the second embodiment of the present invention shown in FIG. 2 has a configuration in which a plurality of insulating yarns 22 are wound around the outer periphery of the central conductor 1.
- the coaxial cable 20 according to the second embodiment is different from the coaxial cable 10 according to the first embodiment only in that the insulating yarn 22 is wound around the outer periphery of the central conductor 1 instead of the insulating stranded wire 2. is doing. Therefore, description of common parts is omitted.
- the insulating thread 22 has a non-circular cross section.
- the insulating yarn 22 used in FIG. 2 has a quadrangular cross section, but may be a polygon other than the quadrangular shape, and the cross section of the coaxial cable 30 according to the modification of the second embodiment shown in FIG.
- An elliptical insulating thread 32 may be used.
- the elliptical shape is preferably an ellipse whose minor axis is 20% or more shorter than the major axis, and more preferably an ellipse whose minor axis is 30% or less shorter than the major axis.
- the cross-sectional shape of the insulating yarns 22 and 32 may be a polygon having a recessed portion or an ellipse having a recessed portion. Furthermore, the cross-sectional shapes of the insulating yarns 22 and 32 are C-shaped (FIG. 4A), cruciform (FIG. 4B), hollow (FIG. 4C), and radial triangle (FIG. 4D) as shown in FIGS. It may be. From the viewpoint of increasing the porosity between the center conductor 1 and the coating layer 3, a trigonal or pentagonal shape or an elliptical shape is preferable. In the following description, the insulating yarn 22 will be described as an example, but the same applies to the insulating yarn 32 and other modified examples.
- the insulating yarn 22 preferably has a thickness such that the thickness when the insulating yarn 22 is wound around the central conductor 1 is 30 to 100 ⁇ m.
- the insulating yarn 22 it is preferable to use, for example, a filament made of a fluororesin, like the insulating yarn 2 a constituting the insulating stranded wire 2.
- a filament made of a fluororesin like the insulating yarn 2 a constituting the insulating stranded wire 2.
- the fluororesin and filament are as described above.
- the insulating yarn 22 is wound immediately above the center conductor 1 in terms of increasing the void ratio immediately above the center conductor 1.
- Insulating yarns 22 are preferably wound around the outer periphery of the central conductor 1 in terms of increasing the porosity between the central conductor 1 and the covering layer 3. In FIG. 2, eight insulating yarns 22 are wound.
- the insulating yarn 22 having a non-circular cross section is wound by being twisted back. By doing in this way, the porosity between the center conductor 1 and the coating layer 3 can be increased.
- the insulating yarn 22 may be wound around the outer periphery in the reverse direction. Thereby, a space
- the central conductor 1 is a stranded wire
- the insulating yarn 22 is wound around the central conductor 1 in a direction opposite to the twisting direction of the strand 1a of the central conductor 1. That is, it is preferable that the twisting direction or winding direction is alternately reversed, and the twisting direction or winding direction in the same direction is not continued.
- the covering layer 3 is formed by winding a tape
- FIG. 5 is a cross-sectional view showing the structure of a coaxial cable according to a modification of the second embodiment of the present invention.
- the coaxial cable 40 according to the modification of the second embodiment of the present invention shown in FIG. 5 is the second one only in that an insulating thread 42 having a circular cross section is used instead of the insulating thread 22 having a square cross section. This is different from the coaxial cable 20 according to the embodiment.
- the insulating thread 22 having a non-circular cross section is more preferable than the insulating thread 42 having a circular cross section.
- the void ratio in the cable cross-sectional area based on the air gap (mainly the air gap between the insulating yarn 22 and the central conductor 1 and the covering layer 3) existing on the side of the central conductor 1 from the covering layer 3 is 30 to 60%. Is preferable, and 40 to 55% is more preferable.
- the porosity can be measured, for example, by the method described above.
- the coaxial cable according to the embodiment of the present invention is suitable as a coaxial cable built in a medical cable, but can also be applied to other cables.
- the medical cable according to the embodiment of the present invention has a cable core including one or more coaxial cables according to the embodiment of the present invention.
- FIG. 6 is a cross-sectional view showing the structure of a probe cable that is one of medical cables according to an embodiment of the present invention.
- a plurality of coaxial cables according to the embodiment of the present invention (for example, the coaxial cable 10 according to the first embodiment) are bundled (may be bundled and twisted) to form a coaxial cable unit 101, and the coaxial cable unit 101.
- a plurality of wires (7 in FIG. 6) are bundled with a bind tape 102 made of PTFE (polytetrafluoroethylene) or the like to form a cable core, and a plurality of metal wires such as silver-plated copper wires are wound around or braided around the cable core.
- PTFE polytetrafluoroethylene
- the shield cable 103 is provided, and the sheath 104 made of PFA, PVC (polyvinyl chloride), or the like is provided around the shield layer 103, whereby the probe cable 100 is obtained.
- the coaxial cable unit 101 preferably has a coating layer on the outer periphery of a plurality of bundled coaxial cables.
- the medical cable other than the probe cable that is, the catheter cable and the endoscope cable have basically the same structure as the probe cable except that the number of coaxial cables is different.
- a catheter cable may be configured with only one coaxial cable.
- a power supply line and other signal lines may be included.
- 3 and 5 were manufactured by the following method, and the capacitance was measured.
- Coaxial cables were manufactured using the constituent materials shown in Table 1. That is, seven silver-plated copper alloy strands having a strand diameter of 0.013 mm are twisted to form an inner conductor, and six monofilaments (40 ⁇ m diameter) having a circular cross section made of PFA are used as insulating threads on the outer periphery of the inner conductor. A PET tape with a hot melt adhesive layer having a thickness of 0.005 mm is wound around the outer periphery of the insulating yarn as a coating layer, and a wire diameter of 0.017 mm is used as an outer conductor around the outer periphery of the coating layer. 26 silver-plated copper alloy wires were spirally wound, and a PET tape with a hot-melt adhesive layer and a PET tape were sequentially wound around the outer conductor to produce a coaxial cable having an outer diameter of 0.193 mm.
- Example 2 a coaxial cable having an outer diameter of 0.213 mm was used in the same manner as in Example 1 except that five circular monofilaments having a diameter of 55 ⁇ m were used as insulating yarns and the number of strands of the external conductor was changed accordingly. Manufactured. Further, Example 3 is the same as Example 1 except that five elliptical monofilaments having a major axis of 50 ⁇ m and a minor axis of 40 ⁇ m are used as the insulating yarn and the number of strands of the external conductor is changed accordingly. Thus, a coaxial cable having an outer diameter of 0.223 mm was manufactured.
- Table 1 shows the results of measuring the capacitance of the coaxial cables of Examples 1 to 3. As can be seen from Table 1, by using the coaxial cable according to the embodiment of the present invention, it was possible to achieve a capacitance of 60 to 72 pF / m equivalent to foam extrusion. *
- this invention is not limited to the said embodiment and Example, Various deformation
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Abstract
Description
[2]複数本の前記絶縁性撚線又は前記絶縁糸は、前記中心導体の直上に巻き付けられている前記[1]に記載の同軸ケーブル。
[3]前記被覆層は、チューブ状である前記[1]又は[2]に記載の同軸ケーブル。
[4]前記被覆層は、フッ素樹脂、ポリエチレン(PE)、ポリプロピレン(PP)から選ばれる樹脂を押出成形することにより形成されたものである前記[1]~[3]のいずれか1つに記載の同軸ケーブル。
[5]前記被覆層は、ホットメルト接着層付きのポリエチレンテレフタレート(PET)テープ、ポリエーテルイミド(PEI)テープ又はポリイミド(PI)テープを巻き付けることにより形成されたものである前記[1]~[3]のいずれか1つに記載の同軸ケーブル。
[6]前記中心導体は、3本又は7本の素線の撚線からなる前記[1]~[5]のいずれか1つに記載の同軸ケーブル。
[7]前記中心導体は、42~50AWGである前記[1]~[6]のいずれか1つに記載の同軸ケーブル。
[8]前記絶縁性撚線は、2本又は3本の前記糸を撚り合わせたものである前記[1]~[7]のいずれか1つに記載の同軸ケーブル。
[9]前記絶縁性撚線を構成する前記糸は、フッ素樹脂からなるフィラメントである前記[1]~[8]のいずれか1つに記載の同軸ケーブル。
[10]前記絶縁糸は、断面が非真円形である前記[1]~[9]のいずれか1つに記載の同軸ケーブル。
[11]前記非真円形は、多角形又は楕円形である前記[10]に記載の同軸ケーブル。
[12]前記絶縁性撚線又は前記絶縁糸は、前記中心導体の外周に3~8本、巻き付けられている前記[1]~[11]のいずれか1つに記載の同軸ケーブル。
[13]前記中心導体は、撚線であり、前記絶縁性撚線は、前記中心導体の撚り方向とは逆方向に前記中心導体に巻き付けられている前記[1]~[12]のいずれか1つに記載の同軸ケーブル。
[14]前記中心導体は、撚線であり、前記絶縁糸は、前記中心導体の撚り方向とは逆方向に前記中心導体に巻き付けられている前記[1]~[12]のいずれか1つに記載の同軸ケーブル。
[15]前記被覆層は、テープを巻き付けることにより形成されたものであり、前記テープは、前記絶縁性撚線又は前記絶縁糸の巻き付け方向とは逆方向に巻き付けられている前記[1]~[3]、[5]のいずれか1つに記載の同軸ケーブル。
[16]前記[1]~[15]のいずれか1つに記載の同軸ケーブルを1本以上備えたケーブルコアを有する医療用ケーブル。
(第1の実施の形態)
図1は、本発明の第1の実施の形態に係る同軸ケーブルの構造を示す横断面図である。
図1に示される本発明の第1の実施の形態に係る同軸ケーブル10は、絶縁性の糸2aを複数本撚り合わせた絶縁性撚線2を複数本、中心導体1の外周に巻き付けた構成を有する。
<空隙率の測定方法>
中心導体と絶縁性撚線と被覆層からなるケーブル半製品を、例えばエポキシ樹脂などの熱硬化性樹脂中に配置して固め、その後、横断面を砥粒などで研磨する。研磨された横断面の画像より、中心導体、絶縁性撚線、及び被覆層の面積を計測する。この合計面積と被覆層外径(ケーブル半製品の外径)を直径とする円の面積との差が空隙の面積である。被覆層外径を直径とする円の面積に対し、空隙の面積が占める割合を計算することで空隙率が求められる。
図2は、本発明の第2の実施の形態に係る同軸ケーブルの構造を示す横断面図である。
図2に示される本発明の第2の実施の形態に係る同軸ケーブル20は、絶縁糸22を複数本、中心導体1の外周に巻き付けた構成を有する。第2の実施の形態に係る同軸ケーブル20は、絶縁性撚線2に替えて、絶縁糸22を中心導体1の外周に巻き付ける点においてのみ、第1の実施の形態に係る同軸ケーブル10と相違している。したがって、共通部分の説明は省略する。
図5に示される本発明の第2の実施の形態の変形例に係る同軸ケーブル40は、断面四角形の絶縁糸22に替えて、断面円形の絶縁糸42を用いている点においてのみ、第2の実施の形態に係る同軸ケーブル20と相違している。
本発明の実施の形態に係る医療用ケーブルは、上記本発明の実施の形態に係る同軸ケーブルを1本以上備えたケーブルコアを有する。
上記本発明の実施の形態に係る同軸ケーブル(例えば第1の実施形態に係る同軸ケーブル10)を複数本束ねて(束ねて撚り合せても良い)、同軸ケーブルユニット101とし、その同軸ケーブルユニット101複数本(図6では7本)をPTFE(ポリテトラフルオロエチレン)等からなるバインドテープ102で束ねてケーブルコアとし、その周囲に銀めっき銅線などの金属線を複数本巻き付け、又は編組してなるシールド層103を設け、そのシールド層103の周囲にPFAやPVC(ポリ塩化ビニル)などからなるシース104を設けることでプローブケーブル100が得られる。同軸ケーブルユニット101は、束ねた複数本の同軸ケーブルの外周に被覆層を有していることが好ましい。
本発明の実施形態によれば、以下の効果を奏する。
(1)中心導体との間や被覆層との間に空隙を設けることができるため、発泡絶縁層を備えることなく、当該発泡絶縁層と同様の機能を発揮できる新規な絶縁層を備えた同軸ケーブル及び当該同軸ケーブルを用いた医療用ケーブルを提供できる。
(2)ケーブル長手方向及び周方向に空隙がバラツキ無く設けられた同軸ケーブル及び当該同軸ケーブルを用いた医療用ケーブルを提供できる。
表1に示す構成材料を用いて同軸ケーブルを製造した。すなわち、素線径0.013mmの銀メッキ銅合金素線7本を撚り合せて内部導体とし、該内部導体の外周に絶縁糸としてPFAからなる横断面が円形のモノフィラメント(40μm径)を6本、巻付けピッチ1.2mmで巻き付け、該絶縁糸の外周に被覆層として厚さ0.005mmのホットメルト接着層付PETテープを巻き付け、該被覆層の外周に外部導体として素線径0.017mmの銀メッキ銅合金素線を26本螺旋状に巻き付け、該外部導体の外周にホットメルト接着層付PETテープとPETテープを順次巻き付け、外径0.193mmの同軸ケーブルを製造した。
実施例2では、絶縁糸として55μmの径の円形モノフィラメントを5本使用した点とそれに伴い外部導体の素線本数を変更した点以外は実施例1と同様にして外径0.213mmの同軸ケーブルを製造した。また、実施例3では、絶縁糸として横断面が長径50μm、短径40μmの楕円形のモノフィラメントを5本使用した点とそれに伴い外部導体の素線本数を変更した点以外は実施例1と同様にして外径0.223mmの同軸ケーブルを製造した。
3:被覆層、4:外部導体、5:ジャケット
10,20,30,40:同軸ケーブル
22,32,42:絶縁糸
100:プローブケーブル、101:同軸ケーブルユニット
102:バインドテープ、103:シールド層、104:シース
Claims (16)
- 絶縁性の糸を複数本撚り合わせた絶縁性撚線又は絶縁糸を複数本、中心導体の外周に巻き付け、前記絶縁性撚線又は前記絶縁糸の上に、前記絶縁性撚線又は前記絶縁糸との間に空隙を形成するための被覆層を設け、前記被覆層の外周に外部導体及びジャケットを設けた同軸ケーブル。
- 複数本の前記絶縁性撚線又は前記絶縁糸は、前記中心導体の直上に巻き付けられている請求項1に記載の同軸ケーブル。
- 前記被覆層は、チューブ状である請求項1又は請求項2に記載の同軸ケーブル。
- 前記被覆層は、フッ素樹脂、ポリエチレン(PE)、ポリプロピレン(PP)から選ばれる樹脂を押出成形することにより形成されたものである請求項1~3のいずれか1項に記載の同軸ケーブル。
- 前記被覆層は、ホットメルト接着層付きのポリエチレンテレフタレート(PET)テープ、ポリエーテルイミド(PEI)テープ又はポリイミド(PI)テープを巻き付けることにより形成されたものである請求項1~3のいずれか1項に記載の同軸ケーブル。
- 前記中心導体は、3本又は7本の素線の撚線からなる請求項1~5のいずれか1項に記載の同軸ケーブル。
- 前記中心導体は、42~50AWGである請求項1~6のいずれか1項に記載の同軸ケーブル。
- 前記絶縁性撚線は、2本又は3本の前記糸を撚り合わせたものである請求項1~7のいずれか1項に記載の同軸ケーブル。
- 前記絶縁性撚線を構成する前記糸は、フッ素樹脂からなるフィラメントである請求項1~8のいずれか1項に記載の同軸ケーブル。
- 前記絶縁糸は、断面が非真円形である請求項1~9のいずれか1項に記載の同軸ケーブル。
- 前記非真円形は、多角形又は楕円形である請求項10に記載の同軸ケーブル。
- 前記絶縁性撚線又は前記絶縁糸は、前記中心導体の外周に3~8本、巻き付けられている請求項1~11のいずれか1項に記載の同軸ケーブル。
- 前記中心導体は、撚線であり、前記絶縁性撚線は、前記中心導体の撚り方向とは逆方向に前記中心導体に巻き付けられている請求項1~12のいずれか1項に記載の同軸ケーブル。
- 前記中心導体は、撚線であり、前記絶縁糸は、前記中心導体の撚り方向とは逆方向に前記中心導体に巻き付けられている請求項1~12のいずれか1項に記載の同軸ケーブル。
- 前記被覆層は、テープを巻き付けることにより形成されたものであり、前記テープは、前記絶縁性撚線又は前記絶縁糸の巻き付け方向とは逆方向に巻き付けられている請求項1~3、5のいずれか1項に記載の同軸ケーブル。
- 請求項1~15のいずれか1項に記載の同軸ケーブルを1本以上備えたケーブルコアを有する医療用ケーブル。
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US15/546,189 US10614931B2 (en) | 2015-01-27 | 2015-01-27 | Coaxial cable and medical cable |
KR1020177020918A KR102291012B1 (ko) | 2015-01-27 | 2015-01-27 | 동축 케이블 및 의료용 케이블 |
CN201580074602.4A CN107210096B (zh) | 2015-01-27 | 2015-01-27 | 同轴电缆和医疗用电缆 |
JP2016571550A JP6237936B2 (ja) | 2015-01-27 | 2015-01-27 | 同軸ケーブル及び医療用ケーブル |
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