Electrocardio main cable based on multi-layer heterogeneous shielding structure and manufacturing method thereof

Abstract

The embodiment of the invention provides an electrocardio main cable based on a multi-layer heterogeneous shielding structure and a manufacturing method of the electrocardio main cable, and relates to the field of cables. Comprising a wire core group, a composite shielding layer structure and an outer sheath, the composite shielding layer structure and the outer sheath sequentially wrap the wire core group, the wire core group comprises a plurality of twisted pairs, and each twisted pair is formed by asymmetrically twisting a signal wire and a ground wire; the composite shielding layer structure is composed of a plurality of composite shielding sections which are arranged at intervals along the axial direction of the cable, and a resistive material is filled between the adjacent composite shielding sections; the composite shielding section sequentially comprises a spiral copper foil layer, a silver polyester braid layer and an amorphous silicon carbide coating from inside to outside, and the spiral copper foil layer wraps the outside of the multiple groups of twisted pairs; and the outer sheath is coated outside the amorphous silicon carbide coating. According to the invention, broadband shielding compatibility and pure physical structure noise reduction can be realized, the noise reduction effect is improved without additional electronic components, and the cable is light and low in cost.

Description

Technical Field

[0001] The present invention relates to the field of cables, and in particular to an electrocardiogram main cable based on a multi-layer heterogeneous shielding structure and a manufacturing method thereof. Background Art

[0002] Electrocardiogram monitoring is the main basis for monitoring and diagnosing cardiovascular diseases, and usually electrode patches, cables, and monitoring devices cooperate with each other. During long-term monitoring, since the cable is often in a bent and moving state, noise is often generated due to friction, interfering with electrocardiogram monitoring.

[0003] The traditional electrocardiogram pure cable structure has the following problems: insufficient high-frequency shielding: manifested in that the attenuation of the single-layer metal braided shield is less than 30 dB in the frequency band above 100 MHz; sensitive to mechanical noise: static electricity noise is generated by the friction of the internal wires when the cable is bent; grounding distributed capacitance coupling: continuous grounding of the shield layer leads to amplification of common-mode interference.

[0004] The current noise reduction solutions mainly rely on external filter circuits or additional shielding boxes, but the additional devices make the cable bulky and costly. Summary of the Invention

[0005] In view of the above problems, embodiments of the present invention are proposed to provide an electrocardiogram main cable based on a multi-layer heterogeneous shielding structure and a manufacturing method thereof that overcome the above problems or at least partially solve the above problems.

[0006] An electrocardiogram main cable based on a multi-layer heterogeneous shielding structure includes a core group, a composite shielding layer structure and an outer sheath sequentially coated on the outside of the core group. The core group includes multiple pairs of twisted pairs, and the twisted pairs are formed by asymmetric twisting of signal wires and ground wires; The composite shielding layer structure is composed of multiple composite shielding segments arranged at intervals along the axial direction of the cable, and a resistive material is filled between adjacent composite shielding segments; Each composite shielding segment sequentially includes a spiral copper foil layer, a silver-polyester braided layer and an amorphous silicon carbide coating from the inside to the outside, and the spiral copper foil layer is coated on the outside of the multiple pairs of twisted pairs; The outer sheath is coated on the outside of the amorphous silicon carbide coating.

[0007] Preferably, an FEP foam filling layer is filled between the multiple pairs of twisted pairs.

[0008] Preferably, the signal wires and the ground wires are alternately twisted, and the twisting direction alternates every 10 cm; wherein, the twist pitch ratio is 1:4.

[0009] Preferably, the length of each of the composite shielding segments is 15 cm, and the spacing distance between adjacent composite shielding segments is 10 cm - 20 cm; the resistance value of the resistive material is 100 Ω - 10 kΩ.

[0010] Preferably, the resistive material is a polymer conductive adhesive, and the volume resistivity of the polymer conductive adhesive is 10^3 Ω·cm.

[0011] Preferably, the outer surface of the outer sheath is provided with a honeycomb structure, and the depth of the pits of the honeycomb structure is 30 - 80 μm and the spacing is 100 - 300 μm.

[0012] Preferably, the outer sheath is made of silicone rubber.

[0013] Preferably, the spiral copper foil layer is formed by spirally winding a copper foil strip around the outside of the multiple pairs of twisted pairs, wherein the thickness of the copper foil strip is 0.02 mm and the coverage rate is 100%; The silver wire polyester braided layer is woven from a braided silver wire and a polyester blended mesh, wherein the silver wire accounts for 60%, the braiding angle is 30°, and the mesh count is 150; The amorphous silicon carbide coating is formed by magnetron sputtering deposition, wherein the coating thickness is 100 nm and the resistivity is 10^2 Ω·m.

[0014] Preferably, a composite insulating layer is coated on the outside of the signal wires of each pair of twisted pairs, and the composite insulating layer sequentially includes an FEP inner layer, a TPU middle layer, and a silicone outer layer from the inside to the outside.

[0015] A manufacturing method of the electrocardiogram main cable as described above includes the following steps: Correspondingly match multiple signal wires and multiple ground wires one by one and twist them asymmetrically to form multiple pairs of twisted pairs; Spirally wind the spiral copper foil layer around the outside of the multiple pairs of twisted pairs, and sequentially coat the silver wire polyester braided layer and the amorphous silicon carbide coating on the outside of the silver wire polyester braided layer to form a composite shielding layer structure; Cut the composite shielding layer structure into multiple composite shielding segments at preset intervals along the axial direction of the cable, and fill a resistive material between the multiple composite shielding segments; Coat an outer sheath on the outside of the multiple composite shielding segments and the resistive material.

[0016] This application specifically includes the following advantages: In an embodiment of the present application, through a core group, a composite shielding layer structure and an outer sheath sequentially coated on the outside of the core group, the core group includes multiple pairs of twisted pairs, and the twisted pairs are formed by asymmetrically twisting a signal line and a ground line; the composite shielding layer structure is composed of multiple composite shielding segments arranged at intervals along the axial direction of the cable, and a resistive material is filled between adjacent composite shielding segments; the composite shielding segment sequentially includes a spiral copper foil layer, a silver-polyester braided layer and an amorphous silicon carbide coating from the inside to the outside, and the spiral copper foil layer is coated on the outside of the multiple pairs of twisted pairs; the outer sheath is coated on the outside of the amorphous silicon carbide coating. The twisted pairs are formed by asymmetrically twisting a signal line and a ground line, which can reduce crosstalk between wires and thus reduce noise; combined with three-layer heterogeneous shielding layers, namely a spiral copper foil layer, a silver-polyester braided layer and an amorphous silicon carbide coating, it can shield against low-frequency magnetic fields, medium-high frequency radiation and GHz microwaves respectively, realize full-band electromagnetic shielding, and further reduce cable noise; and by setting the composite shielding layer structure in segments and using a resistive material for weak connection to form a distributed RC filter, and grounding through segmented shielding, the common-mode current loop can be blocked, thereby effectively reducing noise, improving signal integrity and anti-interference ability. The present application can achieve wide-band shielding compatibility and pure physical structure noise reduction, improve the noise reduction effect without additional electronic components, make the cable lightweight and have low cost. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions of the present application, the drawings required for the description of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of the electrocardiogram main cable based on a multi-layer heterogeneous shielding structure of the present invention; Reference Signs: 1, core group; 11, twisted pair; 111, signal line; 112, ground line; 113, composite insulating layer; 21, spiral copper foil layer; 22, silver-polyester braided layer; 23, amorphous silicon carbide coating; 2, composite shielding layer structure; 3, outer sheath; 4, FEP foam filling layer. Detailed Embodiments

[0019] To make the objects, features and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application. Refer toFigure 1 , which shows a schematic structural diagram of a main electrocardiogram cable based on a multi-layer heterogeneous shielding structure according to the present invention. Specifically, it may include the following structures: a core group 1, a composite shielding layer structure 2 and an outer sheath 3 sequentially coated on the outside of the core group 1. The core group 1 includes multiple pairs of twisted wires 11, and the pair of twisted wires 11 is formed by asymmetrically twisting a signal wire 111 and a ground wire 112; The composite shielding layer structure 2 is composed of multiple composite shielding segments arranged at intervals along the axial direction of the cable, and a resistive material is filled between adjacent composite shielding segments; Each composite shielding segment sequentially includes a spiral copper foil layer 21, a silver wire polyester braided layer 22 and an amorphous silicon carbide coating 23 from the inside to the outside. The spiral copper foil layer 21 is coated on the outside of the multiple pairs of twisted wires 11; The outer sheath 3 is coated on the outside of the amorphous silicon carbide coating 23.

[0020] In the embodiment of the present application, through the core group 1, the composite shielding layer structure 2 and the outer sheath 3 sequentially coated on the outside of the core group 1, the core group 1 includes multiple pairs of twisted wires 11, and the pair of twisted wires 11 is formed by asymmetrically twisting a signal wire 111 and a ground wire 112; the composite shielding layer structure 2 is composed of multiple composite shielding segments arranged at intervals along the axial direction of the cable, and a resistive material is filled between adjacent composite shielding segments; each composite shielding segment sequentially includes a spiral copper foil layer 21, a silver wire polyester braided layer 22 and an amorphous silicon carbide coating 23 from the inside to the outside. The spiral copper foil layer 21 is coated on the outside of the multiple pairs of twisted wires 11; the outer sheath 3 is coated on the outside of the amorphous silicon carbide coating 23. By forming the pair of twisted wires 11 by asymmetrically twisting the signal wire 111 and the ground wire 112, crosstalk between wires can be reduced, thereby reducing noise; combined with three layers of heterogeneous shielding layers, namely the spiral copper foil layer 21, the silver wire polyester braided layer 22 and the amorphous silicon carbide coating 23, it can shield against low-frequency magnetic fields, medium- and high-frequency radiation and GHz microwaves respectively, achieve full-band electromagnetic shielding, and further reduce cable noise; and by setting the composite shielding layer structure 2 in segments and using a resistive material for weak connection to form a distributed RC filter, and grounding through segmented shielding, the common-mode current loop can be blocked, thereby effectively reducing noise, improving signal integrity and anti-interference ability. The present application can achieve wide-band shielding compatibility and pure physical structure noise reduction, improve the noise reduction effect without additional electronic components, make the cable light and have low cost.

[0021] Next, a main electrocardiogram cable based on a multi-layer heterogeneous shielding structure in this exemplary embodiment will be further described.

[0022] In the embodiments of the present application, the above-mentioned core wire group includes multiple pairs of twisted wires 11. Each pair of twisted wires 11 is formed by asymmetrically twisting a signal wire 111 and a ground wire 112. By using the asymmetric pair of twisted wires 11, crosstalk between wires is reduced, thereby reducing the noise caused by crosstalk and avoiding signal distortion and misjudgment.

[0023] As an example, an FEP (fluorinated ethylene propylene) foamed filling layer is filled between the multiple pairs of twisted wires 11. Its density is 0.6 g / cm³, which can buffer mechanical stress, thereby reducing the frictional noise between the multiple pairs of twisted wires 11.

[0024] As an example, the above-mentioned signal wire 111 and the ground wire 112 are alternately twisted, and the twisting direction alternates every 10 cm; among them, the twist pitch ratio is 1:4. That is, the twisting direction alternately uses left-handed and right-handed, and switches every 10 cm, which can reduce skin effect interference, and further reduce electromagnetic interference and avoid high-frequency noise. Among them, the diameter of the signal wire 111 is preferably 0.08 mm, and the diameter of the ground wire 112 is preferably 0.12 mm; both the signal wire 111 and the ground wire 112 are preferably silver-plated copper wires, the silver layer thickness is 2 μm, and the DC resistance ≤ 0.1 Ω / m.

[0025] By combining the design of the FEP foamed filling layer 4 with the alternating twisting direction, a dynamic stress dissipation structure can be formed, effectively eliminating the frictional noise of the wires caused by bending.

[0026] In the embodiments of the present application, the above-mentioned composite shielding layer structure 2 is composed of multiple composite shielding segments arranged at intervals along the axial direction of the cable, and a resistive material is filled between adjacent composite shielding segments. By adopting a segmented shielding grounding design and through a resistive weak connection, common-mode current can be effectively suppressed.

[0027] As an example, the composite shielding layer structure 2 is divided into independent shielding segments. The length of each composite shielding segment is 15 cm, and the interval distance between adjacent composite shielding segments is 10 cm - 20 cm; the resistance value of the resistive material is 100 Ω - 10 kΩ.

[0028] Specifically, adjacent segments are weakly connected by a polymer conductive adhesive (resistance 1 kΩ). The volume resistivity of the polymer conductive adhesive is 10^3 Ω·cm, forming a distributed RC filter. Through distributed insulated grounding, the common-mode current loop is blocked, thereby reducing high-frequency noise.

[0029] In the embodiments of the present application, the above composite shielding section sequentially includes a spiral copper foil layer 21, a silver wire polyester braided layer 22, and an amorphous silicon carbide coating 23 from the inside to the outside. The spiral copper foil layer 21 is wrapped around the outside of the multiple pairs of twisted pairs 11. Through the three-layer heterogeneous shielding structure, it targets low-frequency magnetic fields, medium and high-frequency radiation, and GHz microwaves respectively from the inside to the outside, covering electromagnetic interference from kHz to GHz, and achieving full-band electromagnetic shielding.

[0030] As an example, the above spiral copper foil layer 21 is formed by spirally winding a copper foil strip around the outside of the multiple pairs of twisted pairs 11. Among them, the thickness of the copper foil strip is 0.02 mm, the width is 5 mm, and the coverage rate is 100%; specifically, during the spiral winding process, the edges of the copper foil strip overlap by 1 mm, and the overlapping part is coated with conductive epoxy resin (resistance ≤ 0.01 Ω) to suppress low-frequency magnetic fields.

[0031] The above silver wire polyester braided layer 22 is woven from a blend of woven silver wires and polyester mesh. Among them, the silver wire accounts for 60%, the braiding angle is 30°, and the mesh count is 150; through the fabric pores of the above silver wire polyester braided layer 22, high-frequency electromagnetic waves can be scattered, thereby isolating them.

[0032] The above amorphous silicon carbide coating 23 is formed by magnetron sputtering deposition. Among them, the coating thickness is 100 nm and the resistivity is 10^2 Ω·m; taking the amorphous silicon carbide coating 23 as the outermost shielding layer can absorb radiation in the GHz band. Specifically, the above coating is prepared by magnetron sputtering deposition of amorphous silicon carbide in a vacuum chamber (5×10^-3 Pa), where the target power density is 10 W / cm². In a specific test, the overall shielding effectiveness of the composite shielding layer structure 2: 10 kHz - 100 MHz: ≥90 dB; 100 MHz - 2 GHz: ≥60 dB (according to the IEC 61196-1 standard).

[0033] In the embodiments of the present application, the above outer sheath 3 is wrapped around the outside of the amorphous silicon carbide coating 23 for protecting and insulating the cable.

[0034] As an example, a honeycomb structure is provided on the outer surface of the above outer sheath 3, and the depth of the pits of the honeycomb structure is 30 - 80 μm and the spacing is 100 - 300 μm. The surface honeycomb structure can reduce the accumulation of frictional charges, thereby reducing the generation of noise.

[0035] As an example, the above outer sheath 3 is a medical-grade silicone rubber (Shore hardness 50A), and a honeycomb structure is laser-etched on its outer surface, which can not only achieve a good protection effect but also reduce frictional noise.

[0036] As an example, the signal lines 111 of each pair of twisted-pair wires 11 described above are externally coated with a composite insulation layer 113. The composite insulation layer 113 sequentially includes an FEP inner layer, a TPU (thermoplastic polyurethane) middle layer, and a silicone outer layer from the inside to the outside. The three layers are co-extruded outside the signal line 111, and the total thickness is 0.5 mm. Using the three-layer composite insulation of FEP, TPU, and silicone can greatly improve the insulation effect of the signal line 111, and has good tear resistance and electromagnetic adsorption effects.

[0037] The embodiment of the present application also provides a method for manufacturing a main electrocardiogram cable, including the following steps: Manufacturing the wire core group 1: Matching multiple signal lines 111 with multiple ground wires 112 one by one and twisting them asymmetrically to form multiple pairs of twisted-pair wires 11; specifically, a composite insulation layer 113 is co-extruded outside each silver-plated copper signal line 111 with a diameter of 0.08 mm. Among them, the FEP inner layer is 0.1 mm, the TPU middle layer with tear resistance is 0.3 mm, and the silicone outer layer is 0.1 mm to form a three-layer tear-resistant composite insulation layer 113. The signal line 111 and the silver-plated copper ground wire 112 with a diameter of 0.12 mm are twisted at a twist pitch ratio of 1:4, and the twisting direction is switched every 10 cm to form multiple pairs of twisted-pair wires 11. Then, an FEP foaming material (foaming rate 30%) is injected between the multiple pairs of twisted-pair wires 11, and after preheating at 60 °C, it is molded and fixed.

[0038] Manufacturing and processing the composite shielding layer structure 2: A spiral copper foil tape with a width of 5 mm is spirally wound outside the multiple pairs of twisted-pair wires 11, and the overlapping part of the copper foil tape is coated with conductive epoxy resin (resistance ≤ 0.01 Ω) to form a spiral copper foil layer 21. A silver wire and polyester blended mesh is woven with a braiding angle of 30° and a tension of 0.5 N / cm to form a silver wire and polyester braided layer 22, and the silver wire and polyester braided layer 22 is coated outside the spiral copper foil layer 21. Amorphous silicon carbide is magnetron sputtered and deposited in a vacuum chamber (5×10^-3 Pa) with a target power density of 10 W / cm² to form an amorphous silicon carbide coating 23 material, and it is coated outside the silver wire and polyester braided layer 22, thereby forming a three-layer composite shielding layer structure 2.

[0039] Segmented shielding design: The composite shielding layer structure 2 is cut into multiple composite shielding segments at preset intervals along the axial direction of the cable, and a resistive material is filled between the multiple composite shielding segments. Specifically, a laser cutting machine is used to cut an annular notch with a width of 0.2 mm at every 15 cm position of the composite shielding layer structure 2, and a polymer conductive adhesive doped with carbon black is filled in the notch. The volume resistivity of the polymer conductive adhesive is 10^3 Ω·cm.

[0040] Outer sheath 3 coating and surface treatment: An outer sheath 3 is coated on the multi-segment composite shielding section and the resistive material. Specifically, a honeycomb structure is etched on the outer surface of the medical silicone rubber by a 355 nm ultraviolet laser (power 20 W, scanning speed 500 mm / s). The depth of the honeycomb structure pits is 50 μm, and the spacing is 200 μm, thus forming the outer sheath 3.

[0041] Advantages of the embodiments of the present application: The crosstalk between wires is reduced by the asymmetric twisted pair 11. The FEP foam filling layer 4 and the alternating twisting direction design eliminate the wire friction noise caused by bending. The combination of the three-layer heterogeneous shielding layer (copper foil + silver wire braiding + amorphous silicon carbide) realizes full-band electromagnetic shielding. The segmented shielding grounding design suppresses the common-mode current through resistive connection, and the surface honeycomb structure reduces the accumulation of friction charges, significantly improving the quality of the electrocardiogram signal without an external circuit. The present application completely relies on the cable body materials and geometric design, without additional electronic components, and only realizes broadband noise suppression through the cable body structure, achieving pure physical structure noise reduction, which can reduce costs and the weight of the cable used.

[0042] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present invention.

[0043] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the element.

[0044] The above has introduced in detail a kind of electrocardiogram main cable based on a multi-layer heterogeneous shielding structure and its manufacturing method provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An electrocardiogram main cable based on a multi-layer heterogeneous shielding structure, characterized in that, It includes a core group, a composite shielding layer structure and an outer sheath that are sequentially coated on the outside of the core group. The core group includes multiple pairs of twisted pairs, and each pair of twisted pairs is formed by asymmetrically twisting a signal line and a ground line; The composite shielding layer structure is composed of multiple composite shielding segments arranged at intervals along the axial direction of the cable, and a resistive material is filled between adjacent composite shielding segments; Each composite shielding segment sequentially includes a spiral copper foil layer, a silver-polyester braided layer and an amorphous silicon carbide coating from the inside to the outside, and the spiral copper foil layer is coated on the outside of the multiple pairs of twisted pairs; The outer sheath is coated on the outside of the amorphous silicon carbide coating.

2. The electrocardiogram main cable based on a multi-layer heterogeneous shielding structure according to claim 1, characterized in that, An FEP foam filling layer is filled between the multiple pairs of twisted pairs.

3. The electrocardiogram main cable based on the multi-layer heterogeneous shielding structure according to claim 2, characterized in that, The signal line and the ground line are alternately twisted, and the twisting direction alternates every 10 cm; among them, the twist pitch ratio is 1:

4.

4. The electrocardiogram main cable based on the multi-layer heterogeneous shielding structure according to claim 1, characterized in that, The length of each composite shielding segment is 15 cm, and the interval distance between adjacent composite shielding segments is 10 cm - 20 cm; the resistance value of the resistive material is 100 Ω - 10 kΩ.

5. The electrocardiogram main cable based on the multi-layer heterogeneous shielding structure according to claim 4, characterized in that The resistive material is a polymer conductive adhesive, and the volume resistivity of the polymer conductive adhesive is 10^3 Ω·cm.

6. The electrocardiogram main cable based on a multi-layer heterogeneous shielding structure according to claim 1 or 2 or 3, characterized in that A honeycomb structure is provided on the outer surface of the outer sheath, and the depth of the pits of the honeycomb structure is 30 - 80 μm and the pitch is 100 - 300 μm.

7. The electrocardiogram main cable based on the multi-layer heterogeneous shielding structure according to claim 6, characterized in that The outer sheath is made of silicone rubber material.

8. The electrocardiogram main cable based on the multi-layer heterogeneous shielding structure according to claim 1, wherein The spiral copper foil layer is formed by spirally winding a copper foil tape on the outside of the multiple pairs of twisted pairs. Among them, the thickness of the copper foil tape is 0.02 mm and the coverage rate is 100%; The silver-polyester braided layer is woven from a blend of braided silver and polyester mesh. Among them, the silver accounts for 60%, the braiding angle is 30°, and the mesh count is 150; The amorphous silicon carbide coating is formed by magnetron sputtering deposition. Among them, the coating thickness is 100 nm and the resistivity is 10^2 Ω·m.

9. The electrocardiogram main cable based on a multi-layer heterogeneous shielding structure according to claim 1, wherein, A composite insulating layer is coated on the outside of the signal line of each pair of twisted pairs. The composite insulating layer sequentially includes an FEP inner layer, a TPU middle layer and a silicone outer layer from the inside to the outside.

10. A method for manufacturing an electrocardiogram main cable according to any one of claims 1-9, characterized in that, It includes the following steps: Correspondingly match multiple signal lines and multiple ground lines one by one and twist them asymmetrically to form multiple pairs of twisted pairs; Spirally wind the spiral copper foil layer on the outside of the multiple pairs of twisted pairs, and sequentially coat the silver-polyester braided layer and the amorphous silicon carbide coating on the outside of the silver-polyester braided layer to form a composite shielding layer structure; Cut the composite shielding layer structure into multiple composite shielding segments at preset intervals along the axial direction of the cable, and fill a resistive material between the multiple composite shielding segments; Coat an outer sheath on the outside of the multiple composite shielding segments and the resistive material.

Images