Medical detection instrument composite cable and manufacturing method thereof

Abstract

The application discloses a medical detection instrument composite cable, the medical detection instrument composite cable comprises a plurality of signal transmission lines, a tensile filling layer, an outer wrapping layer, an outer shielding layer and an outer sheath layer, the plurality of signal transmission lines are mutually twisted, the tensile filling layer is filled outside the plurality of signal transmission lines and in gaps among the plurality of signal transmission lines, and the outer wrapping layer and the outer shielding layer are mutually twisted. The outer wrapping layer wraps the tensile filling layer, the outer shielding layer is arranged outside the outer wrapping layer, the outer sheath layer is arranged outside the outer shielding layer, the outer shielding layer is formed by crosswise weaving a plurality of left-handed metal wires and a plurality of right-handed metal wires, the helical angle of the left-handed metal wires is 25-35 degrees, the helical angle of the right-handed metal wires is 40-50 degrees, the coverage rate of the left-handed metal wires is 88-92%, and the outer sheath layer is arranged outside the outer shielding layer. The coverage rate of the right-handed rotation metal wire is 83%-87%, and the wire diameter ratio of the left-handed rotation metal wire to the right-handed rotation metal wire is 1: 0.75-1: 0.85. Through the above arrangement, the electromagnetic shielding performance of the medical detection instrument composite cable can be improved.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a composite cable for medical testing instruments and a manufacturing method thereof. Background Art

[0002] The development of medical testing instruments is a fundamental requirement for continuously improving the level of medical science and technology, and also plays a decisive role in the development of clinical disciplines. With the advancement of science and technology, a variety of new medical testing instruments are becoming more and more numerous, and the classification of various treatment methods is becoming more and more refined. Different treatments require different medical testing instruments for diagnosis, and the functional requirements of medical testing instruments are also higher.

[0003] To ensure the proper function of medical testing instruments, cables for medical testing instruments are constructed using a combination of energized conductors and signal lines. This results in a high number of cores within the cable bundle. This is particularly true for some detection equipment, where the stability of signal transmission within the bundle must be guaranteed. Once connected to the equipment, the entire cable must not only overcome interference between the bundles themselves but also avoid interference between the bundles and the instrument.

[0004] A Chinese patent, publication number: CN218602131U, publication date: March 10, 2023, discloses a composite cable for medical diagnostic equipment, comprising: two electrical units and a signal transmission unit; the signal transmission unit comprises two twisted signal wires, the outer sides of the two signal wires being coated with a shielding layer, the shielding layer being spirally coated on the outer sides of the two signal wires, the shielding layer comprising a plurality of metal wires arranged side by side; the two electrical units and the signal transmission unit are twisted together to form a cable core, the outer side of the cable core being coated with an outer sheath layer. The utility model can eliminate electromagnetic interference between the signal wires by twisting the signal wires; by adding a shielding layer to the outer side of the signal wire, it can prevent external interference with the internal signal wire transmission; and at the same time, the shielding layer is coated in an oblique manner. On the basis of ensuring the shielding effect, it can also increase the flexibility of the entire signal transmission unit, facilitate the movement of the cable after being connected to the equipment, and ensure the normal use of the equipment.

[0005] The shortcoming of the above technical solution is that its shielding layer uses a single-layer spirally wrapped metal wire, which will cause electromagnetic leakage: the single-layer spiral winding has an inherent pitch gap (the coverage rate is usually ≤95%), and electromagnetic waves penetrate through the gap (especially in the high-frequency band); at specific frequencies, the periodic gap of the spiral structure shielding layer causes resonance, exacerbating electromagnetic leakage. Summary of the Invention

[0006] In order to address the deficiencies of the prior art, the purpose of the present application is to provide a medical detection instrument composite cable and a manufacturing method thereof, which can improve the electromagnetic shielding performance of the medical detection instrument composite cable.

[0007] To achieve the above objectives, this application adopts the following technical solutions: The present application provides a composite cable for medical detection instruments, which includes: multiple signal transmission lines, a tensile filling layer, an outer wrapping layer, an outer shielding layer and an outer sheath layer. The multiple signal transmission lines are twisted together, the tensile filling layer is filled outside the multiple signal transmission lines and in the gaps between the multiple signal transmission lines, the outer wrapping layer is wrapped outside the tensile filling layer, the outer shielding layer is arranged outside the outer wrapping layer, and the outer sheath layer is arranged outside the outer shielding layer. The outer shielding layer is formed by cross-weaving multiple left-handed metal wires and multiple right-handed metal wires, the helix angle of the left-handed metal wire is 25°~35°, the helix angle of the right-handed metal wire is 40°~50°, the coverage rate of the left-handed metal wire is 88%~92%, the coverage rate of the right-handed metal wire is 83%~87%, and the wire diameter ratio of the left-handed metal wire to the right-handed metal wire is 1:0.75~1:0.85.

[0008] As a preferred technical solution, the signal transmission line includes at least one first signal transmission line, the first signal transmission line includes two first cores twisted together, the first core includes a first core conductor formed by twisting a number of tinned copper wires and a polypropylene insulation layer wrapped around the first core conductor, a first inner shielding layer is provided outside the two first cores, and a first inner wrapping layer is wrapped around the first inner shielding layer.

[0009] As a preferred technical solution, the signal transmission line includes at least one second signal transmission line, the second signal transmission line includes two second cores twisted together, the second core includes a second core conductor formed by twisting a number of tinned copper wires and a foamed polyethylene insulation layer wrapped around the second core conductor, a second inner shielding layer is provided outside the two second cores, and a second inner wrapping layer is wrapped around the second inner shielding layer; by controlling the gas injection rate, the foamed polyethylene insulation layer forms a gradient foaming structure with dense inside and sparse outside.

[0010] As a preferred technical solution, a silicone rubber-based conductive composite material layer is filled between the outer shielding layer and the outer sheath layer. The silicone rubber-based conductive composite material layer includes 30wt% carbon nanotubes and 5wt% silver-coated copper powder. The thickness of the silicone rubber-based conductive composite material layer is 0.2mm, and the elastic modulus of the silicone rubber-based conductive composite material layer is 0.5MPa.

[0011] As a preferred technical solution, the tensile filling layer includes a plurality of aramid fiber filaments and a plurality of carbon fiber filaments. The aramid fiber filaments are made of poly(p-phenylene terephthalamide), and the aramid fiber filaments and the carbon fiber filaments are mixed in a ratio of 10:1.

[0012] As a preferred technical solution, the outer sheath layer is made of polyolefin alloy thermoplastic elastomer material.

[0013] As a preferred technical solution, the helix angle of the left-handed metal wire is 30°, the helix angle of the right-handed metal wire is 45°, the coverage rate of the left-handed metal wire is 90%, the coverage rate of the right-handed metal wire is 85%, and the wire diameter ratio of the left-handed metal wire and the right-handed metal wire is 1:0.8.

[0014] The present application also provides a method for manufacturing a composite cable for medical detection instruments, the manufacturing method comprising: Step 1: Twist 22-30 tinned copper wires with a diameter of 0.05 mm to form a 30AWG conductor, with a total of four conductors being manufactured; Step 2: Add polypropylene material to the outside of two of the conductors to form two first cores; add foamed polyethylene material to the outside of the other two conductors to form two second cores; the two first cores and the two second cores are configured in four different colors; Step 3: twist the two first cores together, and then braid a first inner shielding layer with tinned copper wire on the outside of the twisted first cores; twist the two second cores together, and then braid a second inner shielding layer with tinned copper wire on the outside of the twisted second cores; the coverage of the first inner shielding layer and the second inner shielding layer are both 95%; Step 4: Wrapping a first inner wrapping layer around the first inner shielding layer to form a first signal transmission line, and wrapping a second inner wrapping layer around the second inner shielding layer to form a second signal transmission line, wherein both the first inner wrapping layer and the second inner wrapping layer are made of polytetrafluoroethylene film; Step 5, twisting the first signal transmission line and the second signal transmission line to form a cable core; Step 6: Filling a tensile filling layer outside the cable core and between the first signal transmission line and the second signal transmission line; Step 7, wrapping an outer wrapping layer around the tensile filling layer, wherein the outer wrapping layer is made of polytetrafluoroethylene film; Step 8: Weave an outer shielding layer outside the outer wrapping layer, the outer shielding layer including a plurality of left-handed metal wires and a plurality of right-handed metal wires, the helix angle of the left-handed metal wires is 25° to 35°, the helix angle of the right-handed metal wires is 40° to 50°, the coverage rate of the left-handed metal wires is 88% to 92%, the coverage rate of the right-handed metal wires is 83% to 87%, the wire diameter ratio of the left-handed metal wires to the right-handed metal wires is 1:0.75 to 1:0.85, and the coverage rate of the outer shielding layer is 98%; Step 9: Covering the outer shielding layer with an outer sheath made of polyolefin alloy thermoplastic elastomer.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention adopts an outer shielding layer that is braided by a plurality of left-handed metal wires and a plurality of right-handed metal wires in a spiral manner. Compared with the outer shielding layer structure with a single layer of spiral wrapping, the outer shielding layer coverage is improved, electromagnetic leakage is reduced, and shielding effectiveness is improved; The present application adopts an outer shielding layer which is a plurality of left-handed metal wires and a plurality of right-handed metal wires spirally wound and woven. Compared with the outer shielding layer structure with a single layer of spiral coating, the cable torsional stress is reduced and the torsional strength of the cable is improved. The outer shielding layer of the present application is woven with left-handed metal wires and right-handed metal wires of different wire diameters (the wire diameter ratio of the left-handed metal wires to the right-handed metal wires is 1:0.75~1:0.85), and the thickness of the outer shielding layer is reduced by reducing the braiding density of the right-handed metal wires; The spiral angles of the left-handed metal wire and the right-handed metal wire in the outer shielding layer of the present application are different. Through the phase difference design, the gaps between the left-handed metal wires and the right-handed metal wires are staggered and covered, eliminating the resonant frequency of the single-layer shielding structure, reducing electromagnetic leakage, and improving the shielding effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the composite cable for medical testing instruments in this application; Figure 2 This is a schematic diagram of the structure of the outer shielding layer of this application; Figure 3 This is a schematic diagram of the braided structure of the left-handed metal wire and the right-handed metal wire of the present application; Among them: 11, first signal transmission line; 111, first core; 1111, first core conductor; 1112, polypropylene insulation layer; 112, first inner shielding layer; 113, first inner wrapping layer; 12, second signal transmission line; 121, second core; 1211, second core conductor; 1212, foamed polyethylene insulation layer; 122, second inner shielding layer; 123, second inner wrapping layer; 13, tensile filling layer; 14, outer wrapping layer; 15, outer shielding layer; 151, left-handed metal wire; 152, right-handed metal wire; 16, outer sheath layer. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation of the present application will be clearly and completely described below in conjunction with the drawings in the implementation of the present application.

[0018] like Figure 1 As shown, the present application provides a composite cable for medical detection instruments, which includes: a plurality of signal transmission lines, a tensile filling layer 13, an outer wrapping layer 14, an outer shielding layer 15 and an outer sheath layer 16.

[0019] Several signal transmission lines are twisted together.

[0020] Furthermore, the signal transmission line includes at least one first signal transmission line 11. The first signal transmission line 11 includes two first cores 111 twisted together. The first cores 111 include a first core conductor 1111 formed by twisting a plurality of tinned copper wires together, and a polypropylene insulation layer 1112 wrapped around the first core conductor 1111. A first inner shielding layer 112 is provided outside the two first cores 111, and a first inner wrapping layer 113 is wrapped around the first inner shielding layer 112.

[0021] Furthermore, the signal transmission line includes at least one second signal transmission line 12. The second signal transmission line 12 includes two second cores 121 twisted together. The second cores 121 include a second core conductor 1211 formed by twisting a plurality of tinned copper wires together, and a foamed polyethylene insulation layer 1212 covering the second core conductor 1211. A second inner shielding layer 122 is provided outside the two second cores 121, and a second inner wrapping layer 123 is wrapped around the second inner shielding layer 122.

[0022] By controlling the gas injection rate, the expanded polyethylene insulation layer 1212 forms a gradient foam structure with dense inner layers and sparse outer layers. In this application, the foaming ratio of the inner layer is 30%, and the foaming ratio of the outer layer is 60%. This arrangement ensures insulation strength (withstand voltage > 2kV), while the low density of the outer layer enhances flexibility (bending radius < 5D), reducing signal transmission loss (the dielectric constant is reduced by 15% compared to uniformly foamed EPE).

[0023] In this application, the plurality of signal transmission lines includes a first signal transmission line 11 and a second signal transmission line 12, which are twisted together. The first core 111 of the first signal transmission line 11 utilizes a polypropylene (PP) insulation layer. PP is a material with high temperature resistance (150°C+) and low dielectric loss, making it suitable for high-frequency applications. The second core 121 of the second signal transmission line 12 utilizes an expanded polyethylene (EPE) insulation layer to reduce the dielectric constant, enhance flexibility, and minimize signal delay.

[0024] The tensile filling layer 13 fills the gaps outside and between the signal transmission lines. Furthermore, the tensile filling layer 13 includes a plurality of aramid fiber filaments and a plurality of carbon fiber filaments. The aramid fiber filaments are made of poly(p-phenylene terephthalamide) (PPTA), and the aramid fiber and carbon fiber filaments are mixed in a ratio of 10:1. In this application, the aramid fiber filaments are aramid fiber filaments of the brand "Kevlar."

[0025] Aramid fiber filaments possess ultra-high tensile strength (approximately 3,000 MPa) and an elongation at break of 3-4%, imparting excellent toughness and impact resistance to the infill layer. The electrical conductivity of carbon fiber (resistivity 1.5×10^-3 Ω•cm) aids in static dissipation and reduces signal interference (ESD protection up to 1 kV). Carbon fiber partially reflects electromagnetic waves, synergistically enhancing shielding effectiveness with the shielding layer (an additional 5dB at low frequencies of 100MHz). A 10:1 blend of aramid fiber and carbon fiber filaments achieves a tensile strength of 2,800 MPa (93% of pure aramid) while retaining toughness.

[0026] The outer wrapping layer 14 is wrapped around the tensile filling layer 13 . The outer shielding layer 15 is arranged outside the outer wrapping layer 14 .

[0027] like Figure 2 and Figure 3 As shown, specifically, the outer shielding layer 15 is formed by cross-weaving a plurality of left-handed metal wires 151 and a plurality of right-handed metal wires 152. The helical angle of the left-handed metal wire 151 is 25°~35°, and the helical angle of the right-handed metal wire 152 is 40°~50°. The coverage rate of the left-handed metal wire 151 is 88%~92%, and the coverage rate of the right-handed metal wire 152 is 83%~87%. The wire diameter ratio of the left-handed metal wire 151 and the right-handed metal wire 152 is 1:0.75~1:0.85.

[0028] Preferably, the helix angle of the left-handed metal wire 151 is 30°, the helix angle of the right-handed metal wire 152 is 45°, the coverage rate of the left-handed metal wire 151 is 90%, the coverage rate of the right-handed metal wire 152 is 85%, the coverage rate of the outer shielding layer 15 is 98%, and the wire diameter ratio of the left-handed metal wire 151 and the right-handed metal wire 152 is 1:0.8.

[0029] Among them, the present application adopts an outer shielding layer 15 that is braided by a plurality of left-handed metal wires 151 and a plurality of right-handed metal wires 152 in a spiral winding manner. Compared with the structure of the outer shielding layer 15 with a single layer of spiral wrapping, the outer shielding layer 15 has a higher coverage rate, reduces electromagnetic leakage, and improves shielding effectiveness. The present application adopts an outer shielding layer 15 which is a braided outer shielding layer 15 formed by spirally winding a plurality of left-handed metal wires 151 and a plurality of right-handed metal wires 152. Compared with the outer shielding layer 15 structure with a single layer of spiral coating, the outer shielding layer 15 reduces the torsional stress of the cable and improves the torsional strength of the cable. The outer shielding layer 15 of the present application is woven with left-handed metal wires 151 and right-handed metal wires 152 of different diameters (the diameter ratio of the left-handed metal wires 151 to the right-handed metal wires 152 is 1:0.75 to 1:0.85), and the thickness of the outer shielding layer 15 is reduced by reducing the braiding density of the right-handed metal wires 152; The spiral angles of the left-handed metal wire 151 and the right-handed metal wire 152 of the outer shielding layer 15 of the present application are different. Through the phase difference design, the gaps between the left-handed metal wire 151 and the right-handed metal wire 152 are staggered and overlapped, eliminating the resonant frequency of the single-layer shielding structure, reducing electromagnetic leakage, and improving the shielding effectiveness.

[0030] The outer sheath layer 16 is disposed outside the outer shielding layer 15. Furthermore, the outer sheath layer 16 is made of a polyolefin alloy thermoplastic elastomer material. This polyolefin alloy thermoplastic elastomer material has the following advantages: 1. A balance of high elasticity and high strength: elastic recovery > 90% (ASTM D412 test, superior to the 80-85% of traditional TPU); tensile strength 15-25 MPa (three times that of ordinary EPDM, approaching the level of engineering plastic PA6); compression set < 30% (70°C x 22h, superior to the 40-50% of silicone). 2. Wide temperature range adaptability: Low-temperature resistance: Remains flexible at -50°C (TPU becomes brittle at -30°C); High-temperature resistance: Long-term operating temperature 120°C, short-term temperature resistance 150°C (60°C higher than PVC). 3. Chemical and Weathering Resistance: Oil Resistance: After immersion in IRM903 oil at 70°C for 24 hours, the volume change is <5% (better than NBR rubber's 15%). UV Aging Resistance: After 3000 hours of QUV irradiation, the elongation at break retention is >85% (PVC only 50%). 4. Processing Ease: Melt Flow: MFR 5-30 g / 10 min (190°C / 2.16 kg), suitable for injection molding, extrusion, and blow molding. Reprocessability: Scrap Recyclability >95% (vulcanized rubber is not recyclable).

[0031] Furthermore, a silicone rubber-based conductive composite material layer is filled between outer shielding layer 15 and outer jacket layer 16. This layer comprises 30wt% carbon nanotubes and 5wt% silver-coated copper powder. The thickness of the silicone rubber-based conductive composite material is 0.2mm, and its elastic modulus is 0.5MPa. This arrangement ensures that: the interstices between the spirals of outer shielding layer 15 are filled, forming a continuous conductive interface (shielding effectiveness at a low frequency of 100MHz is increased to 85dB); the elastomer adaptively compensates for bending deformation (shielding attenuation is less than 3dB after 100,000 bends); and gap changes caused by vibration are suppressed (anti-fretting wear life is extended by 5 times).

[0032] The present application also provides a method for manufacturing a composite cable for medical detection instruments, the manufacturing method comprising: Step 1: Twist 22-30 tinned copper wires with a diameter of 0.05 mm to form a 30AWG conductor, with a total of four conductors being manufactured; In this application, the number of tinned copper wires is 26. AWG is the American Wire Gauge, a standard for distinguishing wire diameters, also known as Brown & Sharpe wire gauge.

[0033] Step 2: Add polypropylene material to the outside of two of the conductors to form two first cores 111; add foamed polyethylene material to the outside of the other two conductors to form two second cores 121; the two first cores 111 and the two second cores 121 are configured in four different colors; Step 3: twist the two first cores 111 together, and then braid a first inner shielding layer 112 with tinned copper wire on the outside of the twisted two first cores 111; twist the two second cores 121 together, and then braid a second inner shielding layer 122 with tinned copper wire on the outside of the twisted two second cores 121; the coverage rate of the first inner shielding layer 112 and the second inner shielding layer 122 are both 95%; Step 4: Wrap a first inner wrapping layer 113 around the first inner shielding layer 112 to form a first signal transmission line 11, and wrap a second inner wrapping layer 123 around the second inner shielding layer 122 to form a second signal transmission line 12. Both the first inner wrapping layer 113 and the second inner wrapping layer 123 are made of polytetrafluoroethylene film. Step 5, twisting the first signal transmission line 11 and the second signal transmission line 12 to form a cable core; Step 6: Filling a tensile filling layer 13 outside the cable core and between the first signal transmission line 11 and the second signal transmission line 12; Step 7, wrapping an outer wrapping layer 14 around the tensile filling layer 13, wherein the outer wrapping layer 14 is made of polytetrafluoroethylene film; Step 8: Weave an outer shielding layer 15 outside the outer wrapping layer 14. The outer shielding layer 15 includes a plurality of left-handed metal wires 151 and a plurality of right-handed metal wires 152. The helix angle of the left-handed metal wires 151 is 25° to 35°, and the helix angle of the right-handed metal wires 152 is 40° to 50°. The coverage rate of the left-handed metal wires 151 is 88% to 92%, and the coverage rate of the right-handed metal wires 152 is 83% to 87%. The wire diameter ratio of the left-handed metal wires 151 to the right-handed metal wires 152 is 1:0.75 to 1:0.85, and the coverage rate of the outer shielding layer 15 is 98%. Step 9: Covering the outer shielding layer 15 with an outer sheath made of polyolefin alloy thermoplastic elastomer.

[0034] It should be noted that the words "first", "second" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "an" do not indicate a quantity limitation, but rather indicate the presence of at least one. "Multiple" or "several" means at least two. Unless otherwise specified, words such as "front", "back", "left", "right", "bottom" and / or "top" are used for ease of description only and are not limited to one position or one spatial orientation. Words such as "include" or "comprising" and similar terms mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Words such as "connected" or "connected" and similar terms are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0035] As used in this specification and the appended claims, the singular forms "a," "an," "said," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0036] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims appended to this application.

Claims

1. A medical detection instrument composite cable, comprising: A plurality of signal transmission lines, a tensile filling layer, an outer wrapping layer, an outer shielding layer and an outer sheath layer, wherein the plurality of signal transmission lines are twisted together, the tensile filling layer is filled in the gaps outside the plurality of signal transmission lines and between the plurality of signal transmission lines, the outer wrapping layer is wrapped around the tensile filling layer, the outer shielding layer is arranged outside the outer wrapping layer, and the outer sheath layer is arranged outside the outer shielding layer, characterized in that: The outer shielding layer is formed by cross-weaving a plurality of left-handed metal wires and a plurality of right-handed metal wires. The helix angle of the left-handed metal wire is 25°~35°, the helix angle of the right-handed metal wire is 40°~50°, the coverage rate of the left-handed metal wire is 88%~92%, the coverage rate of the right-handed metal wire is 83%~87%, and the wire diameter ratio of the left-handed metal wire to the right-handed metal wire is 1:0.75~1:0.

85.

2. The medical detection instrument composite cable according to claim 1, characterized in that: The signal transmission line includes at least one first signal transmission line, the first signal transmission line includes two first cores twisted together, the first core includes a first core conductor formed by twisting a plurality of tinned copper wires and a polypropylene insulation layer wrapped around the first core conductor, a first inner shielding layer is provided outside the two first cores, and a first inner wrapping layer is wrapped around the first inner shielding layer.

3. The medical detection instrument composite cable according to claim 1 or 2, characterized in that: The signal transmission line includes at least one second signal transmission line, the second signal transmission line includes two second cores twisted together, the second core includes a second core conductor formed by twisting a plurality of tinned copper wires and a foamed polyethylene insulation layer wrapped around the second core conductor, a second inner shielding layer is provided outside the two second cores, and a second inner wrapping layer is wrapped around the second inner shielding layer; By controlling the gas injection rate, the foamed polyethylene insulation layer forms a gradient foaming structure with dense inner portion and sparse outer portion.

4. The medical detection instrument composite cable according to claim 1, characterized in that: A silicone rubber-based conductive composite material layer is filled between the outer shielding layer and the outer sheath layer. The silicone rubber-based conductive composite material layer includes 30wt% carbon nanotubes and 5wt% silver-coated copper powder. The thickness of the silicone rubber-based conductive composite material layer is 0.2mm, and the elastic modulus of the silicone rubber-based conductive composite material layer is 0.5MPa.

5. The medical detection instrument composite cable according to claim 1, characterized in that: The tensile filling layer includes a plurality of aramid fiber filaments and a plurality of carbon fiber filaments. The aramid fiber filaments are made of poly(p-phenylene terephthalamide). The aramid fiber filaments and the carbon fiber filaments are mixed in a ratio of 10:

1.

6. The medical detection instrument composite cable according to claim 1, characterized in that: The outer sheath layer is made of polyolefin alloy thermoplastic elastomer material.

7. The medical detection instrument composite cable according to claim 1, characterized in that: The helix angle of the left-handed metal wire is 30°, the helix angle of the right-handed metal wire is 45°, the coverage rate of the left-handed metal wire is 90%, the coverage rate of the right-handed metal wire is 85%, and the wire diameter ratio of the left-handed metal wire to the right-handed metal wire is 1:0.

8.

8. A method for manufacturing a composite cable for medical testing instruments, characterized in that: The manufacturing method comprises: Step 1: Twisting 22-30 tinned copper wires with a diameter of 0.05 mm to form a conductor with a specification of 30 AWG, and manufacturing a total of four conductors; Step 2: Adding polypropylene material to the outside of two of the conductors to form two first cores; adding foamed polyethylene material to the outside of the other two conductors to form two second cores; the two first cores and the two second cores are configured in four different colors; Step 3: twist the two first cores together, and then braid a first inner shielding layer with tinned copper wire on the outside of the twisted first cores; twist the two second cores together, and then braid a second inner shielding layer with tinned copper wire on the outside of the twisted second cores; the coverage of the first inner shielding layer and the second inner shielding layer are both 95%; Step 4: Wrapping a first inner wrapping layer around the first inner shielding layer to form a first signal transmission line, and wrapping a second inner wrapping layer around the second inner shielding layer to form a second signal transmission line, wherein both the first inner wrapping layer and the second inner wrapping layer are made of polytetrafluoroethylene film; Step 5, twisting the first signal transmission line and the second signal transmission line to form a cable core; Step 6: Filling a tensile filling layer outside the cable core and between the first signal transmission line and the second signal transmission line; Step 7, wrapping an outer wrapping layer around the tensile filling layer, wherein the outer wrapping layer is made of polytetrafluoroethylene film; Step 8: Weaving an outer shielding layer outside the outer wrapping layer, the outer shielding layer includes a plurality of left-handed metal wires and a plurality of right-handed metal wires, the helix angle of the left-handed metal wires is 25° to 35°, the helix angle of the right-handed metal wires is 40° to 50°, the coverage rate of the left-handed metal wires is 88% to 92%, the coverage rate of the right-handed metal wires is 83% to 87%, the wire diameter ratio of the left-handed metal wires to the right-handed metal wires is 1:0.75 to 1:0.85, and the coverage rate of the outer shielding layer is 98%; Step 9: Covering the outer shielding layer with an outer sheath made of polyolefin alloy thermoplastic elastomer.

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