Coaxial cable suitable for nuclear magnetic resonance imaging

Abstract

The utility model relates to a coaxial cable suitable for nuclear magnetic resonance imaging, which comprises a conductor, an insulating layer, a braided shielding layer, a wrapping shielding layer and an outer sheath, and is characterized in that the conductor is made of silver-plated copper wires; the insulating layer is made of a PFA (Polyfluoroalkoxy) material; the braided shielding layer is formed by braiding silver-plated copper wires; the wrapping shielding layer is a silver-plated copper strip; the outer sheath is made of a PFA (Polyfluoroalkoxy) material; the conductor is sleeved with the insulating layer, the insulating layer is sleeved with the braided shielding layer, the braided shielding layer is sleeved with the wrapping shielding layer, and the wrapping shielding layer is sleeved with the outer sheath; the outer sheath comprises a first sheath body and a second sheath body, the wrapping shielding layer is sleeved with the first sheath body, and the first sheath body is sleeved with the second sheath body.

Description

Technical Field

[0001] This utility model relates to a coaxial cable suitable for nuclear magnetic resonance imaging. Background Technology

[0002] Magnetic Resonance Imaging (MRI) is a non-invasive imaging technique that utilizes the principles of magnetic resonance to provide high-resolution imaging of soft tissues such as the brain, liver, and kidneys, as well as large blood vessels. It is an indispensable tool in modern medical diagnosis. However, to achieve the high-quality requirements of MRI imaging, the signal transmission cables need to possess characteristics such as high shielding efficiency, low signal attenuation, dimensional stability, and corrosion resistance. Coaxial cables used in MRI are a critical component for signal transmission, and their performance directly impacts image quality.

[0003] Existing coaxial cables used for MRI still have some shortcomings, mainly in the following aspects:

[0004] Insufficient shielding efficiency: Most existing coaxial cables use single-layer braided shielding or simple wrapping shielding. These structures are easily affected by electromagnetic interference in the MRI environment, making it difficult to achieve efficient shielding. Especially in high-field MRI applications, insufficient shielding can lead to decreased image quality, artifacts, or noise, affecting diagnostic accuracy.

[0005] High attenuation: Existing coaxial cables are prone to significant signal attenuation during signal transmission, leading to reduced transmission efficiency. Since MRI requires extremely high signal precision, excessive attenuation directly affects image clarity and resolution, increases patient examination time, and impacts imaging results.

[0006] Poor material corrosion resistance: MRI coaxial cables are frequently exposed to disinfectants such as alcohol and glutaraldehyde. Traditional coaxial cables are mostly made of PVC or PE for their outer sheath. Although they have a certain degree of corrosion resistance, they are prone to aging and cracking under frequent disinfection treatments, affecting the cable's service life and safety.

[0007] Insufficient dimensional stability: MRI equipment has very strict requirements for the dimensions of coaxial cables, as large dimensional fluctuations can lead to impedance instability, thus affecting signal quality. The insulation and sheath layers of traditional cables are difficult to control precisely during the extrusion process, often resulting in large fluctuations that impact the accuracy and imaging stability of MRI equipment.

[0008] High surface resistance: Most existing cable conductors use unplated or tin-plated copper wire, which has a high surface resistance, relatively low signal transmission performance, and is prone to increased signal loss. Utility Model Content

[0009] The purpose of this invention is to provide a coaxial cable suitable for nuclear magnetic resonance imaging, which adopts a silver-plated copper wire conductor, a PFA insulation layer, and a double shielding structure, which not only improves shielding efficiency and signal transmission stability, but also enhances corrosion resistance and dimensional accuracy.

[0010] The purpose of this utility model is achieved as follows:

[0011] A coaxial cable suitable for nuclear magnetic resonance imaging includes a conductor, an insulation layer, a braided shielding layer, a wrapped shielding layer, and an outer sheath, wherein the conductor is made of silver-plated copper wire;

[0012] The insulating layer is made of PFA material;

[0013] The braided shielding layer is made of silver-plated copper wire;

[0014] The wrapping shielding layer is a silver-plated copper strip;

[0015] The outer sheath is made of PFA material;

[0016] The insulating layer is sleeved on the conductor, the braided shielding layer is sleeved on the insulating layer, the wrapped shielding layer is sleeved on the braided shielding layer, and the outer sheath is sleeved on the wrapped shielding layer.

[0017] The outer sheath includes a first sheath and a second sheath, wherein the first sheath is fitted onto the wrapping shielding layer and the second sheath is fitted onto the first sheath.

[0018] The cable's conductor uses silver-plated copper wire, which significantly reduces the conductor's surface resistance, improves signal transmission efficiency, ensures low signal loss during transmission, and makes MRI imaging signals clearer and more stable.

[0019] The insulating layer material is PFA (perfluoroalkoxy polymer), which has a low dielectric constant and performs excellently in controlling impedance and signal attenuation. PFA material not only effectively reduces signal loss during transmission but also improves impedance stability while maintaining a small outer diameter.

[0020] The cable employs a dual-layer structure with a braided shield and a wrapped shield. The braided shield, made of silver-plated copper wire, has a braiding coverage exceeding 95%, providing highly efficient electromagnetic shielding and effectively suppressing external electromagnetic interference. Simultaneously, the wrapped shield, made of silver-plated copper strip, further enhances the overall shielding efficiency, ensuring the MRI equipment maintains signal purity and stability under high field strength.

[0021] The outer sheath is made of PFA material, which can effectively resist the corrosion of common disinfectants (such as alcohol, glutaraldehyde, etc.), adapt to the frequent disinfection needs in medical environments, extend the service life of the cable, and ensure the safety and reliability of the equipment.

[0022] The objective of this utility model can also be achieved by the following technical measures:

[0023] Furthermore, the silver-plated copper wire comprises a copper wire, the surface of which is plated with a silver plating layer with a thickness greater than 1 μm.

[0024] The silver plating layer on the surface of the copper wire conductor has high conductivity, and the thickness of the silver plating layer is greater than 1μm, which further reduces the surface resistance of the conductor, significantly reduces signal transmission loss, ensures efficient signal transmission in the MRI system, and improves imaging quality and clarity.

[0025] A silver plating layer with a thickness greater than 1 μm can effectively meet the requirements of high-frequency signal transmission, reduce eddy current loss of high-frequency signals on the conductor surface, ensure the consistency and stability of the signal during transmission, thereby ensuring the signal purity during the imaging process of MRI equipment and helping to improve imaging resolution.

[0026] The silver plating not only improves the conductivity of the conductor but also significantly enhances the oxidation and corrosion resistance of the copper wire. The silver layer effectively isolates the copper wire from direct contact with air and other oxidizing substances, preventing copper oxidation and extending the cable's lifespan, making it particularly suitable for MRI equipment applications in complex medical environments.

[0027] The silver-plated copper wire structure exhibits a lower attenuation rate in high-frequency signal transmission, thereby reducing signal energy loss and meeting the high standards required for signal transmission in MRI systems. Especially in high-field MRI environments, this structure can further improve imaging efficiency and ensure clearer imaging results.

[0028] Furthermore, the silver-plated copper strip includes a copper strip, the surface of which is plated with a silver plating layer with a thickness greater than 1 μm.

[0029] The silver-plated copper strip design adds a silver plating layer with a thickness greater than 1μm to the surface of the copper strip, which greatly improves the conductivity of the shielding layer and reduces the resistance, thereby significantly reducing energy loss during signal transmission and maintaining signal integrity.

[0030] The silver-plated copper strip enhances the shielding efficiency of the wrapping layer, effectively blocking external electromagnetic interference and ensuring the purity of signal transmission. Combined with the braided shielding layer, the high conductivity and shielding performance of the silver-plated copper strip further improve the overall shielding effect of the cable, guaranteeing the clarity and accuracy of MRI imaging.

[0031] Copper strips with a silver plating thickness exceeding 1 μm exhibit more stable performance in high-frequency signal transmission, effectively reducing the impact of high-frequency interference. Since MRI equipment has high requirements for high-frequency signal transmission, the use of silver-plated copper strips further ensures stable signal transmission, reduces artifacts caused by high-frequency interference, and ensures image quality.

[0032] The silver plating provides additional corrosion protection, preventing the copper strip from corroding or oxidizing in humid or oxidizing environments. Especially in medical environments, the highly corrosion-resistant silver plating extends the cable's lifespan, ensuring long-term stability and safety.

[0033] Silver-plated copper strips exhibit excellent dimensional stability and consistency during production; a silver plating layer thicker than 1 μm does not affect the thickness accuracy of the shielding layer. This stable shielding structure helps control the impedance consistency of the cable, thereby improving signal transmission stability, reducing signal deviations caused by dimensional fluctuations, and further optimizing signal quality in MRI systems.

[0034] Furthermore, the braided shielding layer has a braided coverage rate of more than 95%.

[0035] With a braided shielding layer coverage exceeding 95%, a denser shielding mesh can be formed around the cable, effectively blocking external electromagnetic interference. This high coverage enables stable signal transmission in the high-field-strength environment of MRI, reducing image artifacts caused by electromagnetic interference and ensuring image clarity and accuracy.

[0036] The high-coverage braided structure makes the shielding layer tighter and more robust, thereby increasing the cable's tensile and torsional resistance. Especially in the complex applications of MRI systems, this design can extend the service life of the shielding layer and maintain the long-term reliability of the cable.

[0037] A higher braiding coverage can effectively suppress noise and leakage in the transmitted signal, maintain higher signal purity and consistency, reduce transmission loss, improve signal quality, and thus further optimize the effect of MRI imaging.

[0038] In MRI applications, high-frequency signal transmission is susceptible to interference from external high-frequency electromagnetic waves. A braided coverage of more than 95% can form an efficient shielding layer, reducing the risk of high-frequency interference and thus ensuring the high-frequency stability and reliability of the signal during imaging.

[0039] Furthermore, the shielding efficiency of the combination of the braided shielding layer and the wrapped shielding layer is greater than 45dB.

[0040] A shielding efficiency greater than 45dB indicates that the shielding layer can effectively attenuate external electromagnetic interference, reducing signal interference caused by interference sources to an extremely low level. This highly efficient shielding design ensures the stability of MRI equipment in high-field environments, effectively preventing the impact of external interference on image quality and guaranteeing image clarity and accuracy.

[0041] The combination of woven and wrapped shielding effectively suppresses noise and spurious signals during transmission, maintaining high signal purity and preventing signal attenuation and distortion. This high shielding efficiency ensures high fidelity in signal transmission during MRI imaging, contributing to improved image resolution and detail.

[0042] A shielding efficiency of over 45dB provides stronger suppression of high-frequency electromagnetic interference, giving the cable excellent anti-interference performance during high-frequency transmission. This characteristic ensures that high-frequency signals transmitted in the MRI system are less susceptible to external interference, effectively reducing artifacts and providing higher assurance for imaging quality.

[0043] The double-shielded design enhances the cable's resistance to torsion and durability, maintaining stable shielding even in complex installation and operating environments. This not only extends the cable's lifespan but also ensures stable signal transmission and interference immunity of the MRI system during long-term use.

[0044] With a high shielding efficiency of 45dB, imaging errors caused by external interference in MRI equipment are effectively reduced, thereby improving the accuracy and detail of imaging, making diagnostic results more accurate and reliable, and enhancing the application value of MRI in medical diagnosis.

[0045] Furthermore, the diameter fluctuation of the insulation layer is less than 0.05 mm. A specific extrusion die is used in the cable design to control the extrusion fluctuation of the insulation layer within ±0.05 mm. This dimensional control helps maintain the impedance consistency of the cable, further ensuring stable signal transmission and high-quality imaging during MRI imaging.

[0046] Furthermore, the diameter fluctuation of the outer sheath is less than 0.05 mm. A specific extrusion mold is used in the cable design to control the extrusion fluctuation of the sheath layer within ±0.05 mm. This dimensional control helps maintain the impedance consistency of the cable, further ensuring stable signal transmission and high-quality imaging during MRI imaging.

[0047] The beneficial effects of this utility model are as follows:

[0048] In this invention, the conductor and the wrapping shielding layer are made of silver-plated copper material with a silver plating layer thickness of more than 1μm, which effectively reduces the surface resistance of the cable, enhances the signal transmission efficiency, reduces signal loss, and makes the transmission more stable.

[0049] This invention combines a braided shielding layer and a wrapping shielding layer to achieve a shielding efficiency of over 45dB. The braided shielding layer has a coverage rate of over 95%, which significantly improves anti-interference capability and ensures the suppression of external electromagnetic interference in high-field-strength MRI systems, helping to maintain signal purity and high fidelity.

[0050] This invention utilizes a silver plating layer and a double-layer shielding structure to effectively reduce interference and attenuation in high-frequency signal transmission, resulting in clearer signals and ensuring accurate imaging quality in the high-frequency environment of MRI equipment.

[0051] In this invention, the diameter fluctuation range of the insulation layer and the outer sheath is controlled within ±0.05mm, ensuring the impedance consistency of the cable and further improving the stability of signal transmission and imaging effect.

[0052] The outer sheath material of this invention is PFA, which has the characteristics of resisting corrosion by disinfectants such as alcohol and glutaraldehyde. It is suitable for medical environments with frequent disinfection, helps to extend the service life of the cable and ensures long-term stable and reliable performance.

[0053] This invention, through its double-layer structure (the outer sheath of the first and second layers) and high-density braided shielding layer design, provides the cable with better tensile and torsional strength, ensuring its reliability in complex medical environments. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of a coaxial cable suitable for magnetic resonance imaging. Detailed Implementation

[0055] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0056] Implementation examples, in conjunction with Figure 1 As shown, a coaxial cable suitable for nuclear magnetic resonance imaging includes a conductor 1, an insulation layer 2, a braided shielding layer 3, a wrapped shielding layer 4, and an outer sheath 5. The conductor 1 is made of silver-plated copper wire.

[0057] The insulating layer 2 is an insulating layer made of PFA material;

[0058] The braided shielding layer 3 is made of silver-plated copper wire;

[0059] The wrapping shielding layer 4 is a silver-plated copper strip;

[0060] The outer sheath 5 is made of PFA material;

[0061] The insulating layer 2 is sleeved on the conductor 1, the braided shielding layer 3 is sleeved on the insulating layer 2, the wrapped shielding layer 4 is sleeved on the braided shielding layer 3, and the outer sheath 5 is sleeved on the wrapped shielding layer 4.

[0062] The outer sheath 5 includes a first sheath 51 and a second sheath 52. The first sheath 51 is fitted onto the wrapping shielding layer 4, and the second sheath 52 is fitted onto the first sheath 51.

[0063] Furthermore, the silver-plated copper wire comprises a copper wire, the surface of which is plated with a silver plating layer with a thickness greater than 1 μm.

[0064] Furthermore, the silver-plated copper strip includes a copper strip, the surface of which is plated with a silver plating layer with a thickness greater than 1 μm.

[0065] Furthermore, the braided shielding layer 3 has a braided coverage rate of more than 95%.

[0066] Furthermore, the shielding efficiency of the combination of the braided shielding layer 3 and the wrapped shielding layer 4 is greater than 45dB.

[0067] Furthermore, the diameter fluctuation of the insulating layer 2 is less than 0.05 mm.

[0068] Furthermore, the diameter fluctuation of the outer sheath 5 is less than 0.05 mm.

Claims

1. A coaxial cable suitable for nuclear magnetic resonance imaging, comprising a conductor, an insulation layer, a braided shielding layer, a wrapped shielding layer, and an outer sheath, characterized in that: The conductor is made of silver-plated copper wire; The insulating layer is made of PFA material; The braided shielding layer is made of silver-plated copper wire; The wrapping shielding layer is a silver-plated copper strip; The outer sheath is made of PFA material; The insulating layer is sleeved on the conductor, the braided shielding layer is sleeved on the insulating layer, the wrapped shielding layer is sleeved on the braided shielding layer, and the outer sheath is sleeved on the wrapped shielding layer. The outer sheath includes a first sheath and a second sheath, wherein the first sheath is fitted onto the wrapping shielding layer and the second sheath is fitted onto the first sheath.

2. The coaxial cable suitable for nuclear magnetic resonance imaging according to claim 1, characterized in that: The silver-plated copper wire comprises a copper wire, the surface of which is plated with a silver plating layer with a thickness greater than 1 μm.

3. The coaxial cable suitable for nuclear magnetic resonance imaging according to claim 1, characterized in that: The silver-plated copper strip includes a copper strip, the surface of which is plated with a silver plating layer with a thickness greater than 1 μm.

4. The coaxial cable suitable for nuclear magnetic resonance imaging according to claim 1, characterized in that: The braided shielding layer has a braided coverage rate of more than 95%.

5. The coaxial cable suitable for nuclear magnetic resonance imaging according to claim 1, characterized in that: The shielding efficiency of the combination of the braided shielding layer and the wrapped shielding layer is greater than 45dB.

6. The coaxial cable suitable for nuclear magnetic resonance imaging according to claim 1, characterized in that: The diameter fluctuation of the insulating layer is less than 0.05 mm.

7. The coaxial cable suitable for nuclear magnetic resonance imaging according to claim 1, characterized in that: The diameter fluctuation of the outer sheath is less than 0.05 mm.

Images