A method and system for capacitance testing of medical device electrical cord cables

Abstract

The application relates to the technical field of detection of electric wires and cables, and discloses a capacitance testing method and system for electric wires and cables of medical equipment, the method comprising: acquiring geometric parameters, a test frequency and an ambient temperature; judging according to the geometric parameters to obtain an insulation type; when the insulation type is wrap-around insulation, calculating a wrap-around insulation capacitance value and a wrap-around insulation abnormal value according to the geometric parameters, the test frequency and the ambient temperature; when the insulation type is integral insulation, calculating an integral insulation capacitance value and an integral insulation abnormal value according to the geometric parameters; summing the wrap-around insulation capacitance value and the integral insulation capacitance value to obtain an actual capacitance value; and comparing the actual capacitance value with the wrap-around insulation abnormal value and the integral insulation abnormal value to obtain a capacitance test result. The method can accurately calculate the capacitance value of the electric wires and cables of the medical equipment, and guarantees the safety and performance of the medical equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of wire and cable detection, and in particular to a capacitance testing method and system for medical equipment wire and cable. Background Art

[0002] Currently, wires and cables are crucial components for achieving electrical connections in medical devices, playing an irreplaceable role. The safety and performance of medical devices largely depend on the quality of the wires and cables. Capacitance is a crucial operating parameter of wires and cables, and its performance directly impacts the electrical performance and safety of medical devices. Any issues with capacitance can lead to malfunction or accidents.

[0003] In one prior art method for calculating the capacitance value of wires and cables, the cable is modeled as a standard cylindrical capacitor, in which the conductive core and the grounded metal shielding layer constitute the two plates of the capacitor. The capacitance value is calculated by measuring the outer diameter of the insulation layer and the outer diameter of the conductive core of the wire and cable. However, the insulation forms of wires and cables used in medical equipment are more complex and diverse than those of ordinary wires and cables, including both ordinary wire and cable insulation and self-adhesive insulation and metal wrapping. The current capacitance calculation formula for wires and cables can only measure and calculate the insulation of ordinary wires and cables, and cannot meet the requirements for the separate measurement and calculation of self-adhesive insulation and metal wrapping, and cannot ensure the accuracy of the measurement and calculation. Summary of the Invention

[0004] The present invention provides a capacitance testing method and system for medical equipment wires and cables, so as to solve the problem of inaccurate capacitance calculation of medical equipment wires and cables.

[0005] In a first aspect, in order to solve the above technical problems, the present invention provides a capacitance testing method for medical device wires and cables, comprising:

[0006] Obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested;

[0007] Determine the insulation type of the wire and cable to be tested based on the geometric parameters;

[0008] When the insulation type is wrapped insulation, the wrapped insulation capacitance value and the wrapped insulation abnormality value are calculated according to the geometric parameters, the test frequency and the ambient temperature;

[0009] When the insulation type is overall insulation, calculation is performed based on the geometric parameters to obtain an overall insulation capacitance value and an overall insulation anomaly value;

[0010] Performing a summation operation based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested;

[0011] The actual capacitance value is compared with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

[0012] In an optional embodiment, the geometric parameters of the wire and cable to be tested include the outer diameter of the stranded wire, the inner diameter of the stranded wire, the diameter of the stranded wire, the winding angle, the thickness of the insulation layer, the number of stranded wire layers, the outer diameter of the insulation layer, the inner diameter of the insulation layer, the stranding coefficient and the stranding pitch of the wire and cable to be tested.

[0013] In an optional embodiment, determining according to the geometric parameters to obtain the insulation type of the wire and cable to be tested includes:

[0014] Analyzing the outer diameter, inner diameter, diameter and pitch of the stranded wire to obtain geometric structural characteristics;

[0015] When the geometric structure feature shows a multi-layer structure and includes a spiral shape, the insulation type of the wire and cable to be tested is wrapped insulation;

[0016] When the geometric structure feature is a single structure, the insulation type of the wire and cable to be tested is integral insulation.

[0017] In an optional embodiment, the calculating the winding insulation abnormality value according to the geometric parameter, the test frequency and the ambient temperature includes:

[0018] Calculating the relative dielectric constant of the wire and cable to be tested according to the test frequency and the ambient temperature;

[0019] Calculate the wrapping insulation abnormality value according to the relative dielectric constant and the geometric parameters;

[0020] The insulation capacitance of the wrap is calculated using the following formula:

[0021]

[0022] The abnormal value of the insulation is calculated by the following formula:

[0023]

[0024] in, is the relative dielectric constant of the wire and cable to be tested, is the preset standard volume capacitance value of the wire and cable to be tested, is the non-uniform insulation coefficient of the wire and cable to be tested, is the test frequency, The first Radial dimensions of the layer wrapping, For the wires and cables to be tested The circumferential angle between the insulation layer and the inner metal conductor between the layer wraps, is the average radial dimension of the cable to be tested, For the wires and cables to be tested The tangential capacitance between the insulation layer and the inner metal conductor between the layer wraps, is the wrapping filling factor, For the wires and cables to be tested Layer wrapping and The axial dimension of the insulation layer between the layers of wrapping, is the fill factor, is the height of the insulation layer, is the inner diameter of the insulation layer, is the outer diameter of the insulation layer.

[0025] In an optional implementation, the calculating according to the geometric parameters to obtain the overall insulation capacitance value and the overall insulation abnormality value includes:

[0026] The overall insulation capacitance is calculated using the following formula:

[0027]

[0028] The overall insulation anomaly value is calculated using the following formula:

[0029]

[0030] in, is the relative dielectric constant of the copper core of the wire and cable to be tested, is the cross-sectional area of ​​the copper core of the wire and cable to be tested, is the outer diameter of the wire and cable to be tested, is the outer diameter of the outer layer of the wire and cable to be tested, is the relative dielectric constant of the insulation layer of the wire and cable to be tested, is the total thickness of the insulation layer of the wire and cable to be tested, It is the distance between the copper core and the insulation layer of the wire and cable to be tested. is the winding angle, is the fill factor, is the relative dielectric constant of the wire and cable to be tested, is the thickness of the insulation layer, is the number of stranded wire layers, is the strand coefficient, is the strand diameter, is the strand pitch.

[0031] In an optional embodiment, the The relative dielectric constant of the wire and cable to be tested includes:

[0032] The relative dielectric constant is calculated using the following formula:

[0033]

[0034] in, is the test frequency, is the ambient temperature, is the temperature reference, and is the correction constant.

[0035] In an optional embodiment, comparing the actual capacitance value with the wrapping insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result includes:

[0036] When the actual capacitance value is greater than the winding insulation abnormality value, the capacitance test result is winding insulation abnormality;

[0037] When the actual capacitance value is less than the overall insulation abnormality value, the capacitance test result is an overall abnormality;

[0038] When the actual capacitance value is greater than the overall insulation abnormality value, the capacitance test result is normal;

[0039] When the actual capacitance value is between the abnormal value of the winding insulation and the abnormal value of the overall insulation, the capacitance test result shows that both the winding and the overall insulation are abnormal.

[0040] In a second aspect, the present invention provides a capacitance testing system for medical device wires and cables, comprising:

[0041] A data acquisition module is used to obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested;

[0042] An insulation type judgment module is used to judge the insulation type of the wire and cable to be tested based on the geometric parameters;

[0043] a wrap insulation calculation module, which, when the insulation type is wrap insulation, calculates a wrap insulation capacitance value and a wrap insulation anomaly value based on the geometric parameters, the test frequency, and the ambient temperature;

[0044] an overall insulation calculation module, which, when the insulation type is overall insulation, performs calculations based on the geometric parameters to obtain an overall insulation capacitance value and an overall insulation anomaly value;

[0045] A capacitance abnormal value calculation module is used to calculate the abnormal value of the wrapped insulation capacitance and the abnormal value of the overall insulation capacitance according to the insulation type and the geometric parameters of the wire and cable, the test frequency and the ambient temperature, so as to obtain the abnormal value of the wrapped insulation capacitance and the abnormal value of the overall insulation capacitance;

[0046] The test result output module is used to compare the actual capacitance value and the abnormal value of the winding insulation with the abnormal value of the overall insulation to obtain a capacitance test result.

[0047] In a third aspect, the present invention also provides an electronic device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements any one of the above-mentioned methods for testing the capacitance of medical device wires and cables.

[0048] In a fourth aspect, the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any one of the above-mentioned methods for testing the capacitance of medical device wires and cables.

[0049] Compared with the prior art, the present invention has the following beneficial effects: the present invention discloses a capacitance testing method for medical equipment wires and cables, comprising obtaining geometric parameters, test frequency and ambient temperature of the wires and cables to be tested; making a judgment based on the geometric parameters to obtain the insulation type of the wires and cables to be tested; when the insulation type is wrapped insulation, calculating the wrapped insulation capacitance value and the wrapped insulation abnormality value based on the geometric parameters, the test frequency and the ambient temperature; when the insulation type is overall insulation, calculating based on the geometric parameters to obtain the overall insulation capacitance value and the overall insulation abnormality value; performing a summation operation based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain the actual capacitance value of the wires and cables to be tested; comparing the actual capacitance value with the wrapped insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

[0050] The present invention divides the wires and cables of complex and diverse medical devices into two models: overall insulation and wrapped insulation according to geometric parameters. Instead of directly constructing the wires and cables into a model of a standard cylindrical capacitor, the present invention adopts a method of calculating the capacitance value and abnormal value of the wires and cables. Because different insulation types have different capacitance characteristics, the accuracy of the capacitance value can be guaranteed by calculating the capacitance value. The calculation of the wrapped insulation capacitance value takes into account the influence of the winding angle, the non-uniform insulation coefficient of the wire and cable to be tested, the test frequency, the radial dimension, the circumferential angle between the insulation layer and the internal metal conductor, the tangential capacitance between the insulation layer and the internal metal conductor, and the wrapping filling coefficient on the capacitance value. The calculation of the overall insulation capacitance value takes into account the influence of the relative dielectric constant of the copper core, the cross-sectional area of ​​the copper core, the outer diameter of the wire and cable, the outer diameter of the outer layer of the wire and cable to be tested, the relative dielectric constant of the insulation layer, the total thickness of the insulation layer, and the distance between the copper core and the insulation layer on the overall insulation capacitance value. The actual capacitance value is then calculated, thereby ensuring the accuracy of the capacitance value calculation, improving the reliability and safety of the wire and cable, and ensuring the safety and performance of the medical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a flow chart of a capacitance testing method for medical equipment wires and cables provided by the first embodiment of the present invention;

[0052] Figure 2 1 is a schematic structural diagram of a capacitance testing system for medical equipment wires and cables provided in a second embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0054] Reference Figure 1 The first embodiment of the present invention provides a method for testing the capacitance of medical equipment wires and cables, comprising the following steps:

[0055] S11, obtaining geometric parameters, test frequency and ambient temperature of the wire and cable to be tested;

[0056] S12, determining the insulation type of the wire or cable to be tested based on the geometric parameters;

[0057] S13, when the insulation type is wrapped insulation, calculating a wrapped insulation capacitance value and a wrapped insulation abnormality value according to the geometric parameters, the test frequency, and the ambient temperature;

[0058] S14, when the insulation type is overall insulation, performing calculations based on the geometric parameters to obtain an overall insulation capacitance value and an overall insulation anomaly value;

[0059] S15, performing a summation operation based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested;

[0060] S16, comparing the actual capacitance value with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

[0061] In step S11, it is necessary to obtain the geometric parameters, test frequency and ambient temperature of the wire and cable to be tested.

[0062] It should be noted that the geometric parameters include the strand outer diameter, strand inner diameter, strand diameter, wrap angle, insulation thickness, number of strand layers, insulation outer diameter, insulation inner diameter, strand coefficient, and strand pitch. These geometric parameters are obtained directly from measurements or from the cable design specifications and then input into the computer. The strand outer diameter is the outermost diameter of the conductor or insulation layer after stranding; the strand inner diameter is the innermost diameter of the conductor or insulation layer after stranding; the strand diameter is the diameter of the stranded conductor; the wrap angle is the angle between a single conductor and the strand axis during stranding; the insulation thickness is the thickness of the insulation material; the number of strand layers is the number of layers in the stranded conductor; the insulation outer diameter is the outermost diameter of the insulation layer; the insulation inner diameter is the inner diameter of the insulation layer where it contacts the conductor; the strand coefficient is a dimensionless value used to describe the geometric properties of a stranded conductor, ranging from 0.07 to 0.11. The strand pitch is the distance between two adjacent turns of a single conductor on the strand axis during stranding.

[0063] The outer diameter and inner diameter of the stranded wire can be directly measured by using a micrometer with an accuracy of 0.01mm or a vernier caliper with an accuracy of 0.1mm. When the diameter of the conductive wire core is less than 25mm, a micrometer is usually used for measurement; for conductive wire cores with a diameter greater than or equal to 25mm, a vernier caliper is used for measurement.

[0064] The test frequency refers to the frequency of the alternating current used when testing the capacitance of wires and cables. Capacitance changes with the test frequency. The test frequency can be measured using a signal generator or frequency meter.

[0065] Ambient temperature refers to the temperature of the medium surrounding the cable when it is unloaded. It can be measured using a temperature sensor or thermometer. In wire and cable testing, ambient temperature affects the cable's current carrying capacity and thermal stability.

[0066] In another embodiment, the number of strand layers can be calculated based on the outer diameter and inner diameter of the strands, using the following formula:

[0067]

[0068] in, is the number of stranded wire layers, is the strand coefficient, is the inner diameter of the strand, is the outer diameter of the stranded wire, is the fill factor.

[0069] The thickness of the insulation layer can be calculated by the inner diameter of the insulation layer, the outer diameter of the insulation layer, the width of the insulation layer and the winding angle. The calculation formula is as follows:

[0070]

[0071] in, is the thickness of the insulation layer, is the outer diameter of the insulation layer, is the inner diameter of the insulation layer, The winding angle.

[0072] In step S12, a judgment is made based on the geometric parameters to obtain the insulation type of the wire and cable to be tested.

[0073] In one implementation, the outer diameter, inner diameter, diameter and pitch of the stranded wire are analyzed to obtain geometric structural features. When the geometric structural features show a multi-layer structure and include a spiral shape, the insulation type of the wire and cable to be tested is wrapped insulation. When the geometric structural features are a single structure, the insulation type of the wire and cable to be tested is integral insulation.

[0074] It should be noted that a multi-layer structure refers to a cable that includes multiple layers of twisted conductors, each wrapped in a separate insulating material. This structure can improve the mechanical strength and insulation performance of the cable. A spiral shape refers to a cable in which the conductor or insulation layer is wound in a spiral manner. In a wrapped insulated cable, the insulating material is spirally wound along the conductor at a certain winding angle to form a spiral shape. This spiral winding can provide better mechanical protection and electrical insulation. A single structure refers to a cable without layering or spiral winding. For a whole-insulated cable, the insulating material is evenly wrapped around the conductor to form a continuous insulation layer. The single structure design is used for cables that require uniform insulation protection.

[0075] Measuring the outer and inner diameters of the strands provides an understanding of the cable's size range. If multiple layers are present, variations in diameter will be observed between layers. Variations in strand diameter can indicate whether the cable has a multi-layer construction. In twisted-insulated cables, the strand diameter increases as the number of insulation layers increases. When the strand pitch changes with the number of layers, this indicates a multi-layer, spiral cable. Otherwise, this indicates a single-layer cable.

[0076] This method uses geometric parameters to classify the wires and cables used in complex and diverse medical devices into two models: integral insulation and wrapped insulation. This approach bypasses the direct modeling of wires and cables as standard cylindrical capacitors. Because different insulation types have different capacitance characteristics, calculating capacitance and outliers for each insulation type ensures accurate capacitance values.

[0077] In step S3, when the insulation type is wrapped insulation, the wrapped insulation capacitance value and the wrapped insulation abnormality value are calculated according to the geometric parameters, the test frequency and the ambient temperature.

[0078] In one implementation, the wrap insulation capacitance is calculated using the following formula:

[0079]

[0080] The abnormal value of the insulation is calculated by the following formula:

[0081]

[0082] in, is the relative dielectric constant of the wire and cable to be tested, is the preset standard volume capacitance value of the wire and cable to be tested, is the non-uniform insulation coefficient of the wire and cable to be tested, is the test frequency, The first Radial dimensions of the layer wrapping, For the wires and cables to be tested The circumferential angle between the insulation layer and the inner metal conductor between the layer wraps, is the average radial dimension of the cable to be tested, For the wires and cables to be tested The tangential capacitance between the insulation layer and the inner metal conductor between the layer wraps, is the wrapping filling factor, For the wires and cables to be tested Layer wrapping and The axial dimension of the insulation layer between the layers of wrapping, is the fill factor, is the height of the insulation layer, is the inner diameter of the insulation layer, is the outer diameter of the insulation layer.

[0083] It should be noted that It is a preset standard volume capacitance value of the wire and cable to be tested. It is specifically a reference value used to compare the actual measured capacitance value to evaluate the insulation performance of the cable. The non-uniform insulation factor of the wire and cable under test is used to adjust the capacitance value to reflect the non-uniformity of the cable insulation layer, such as thickness variations or material differences. To test the frequency, in the capacitance test, because the capacitance is sensitive to the frequency, It will affect the capacitance value, and its value range is 40~500 . For the wires and cables to be tested The hoop angle between the insulation layer and the inner metal conductor between the layer wraps affects the geometry of the insulation layer and thus the capacitance value. For the wires and cables to be tested The tangential capacitance between the insulation layer and the internal metal conductor between the layer wraps refers to the capacitance contribution of the insulation layer in the tangential direction. The filling factor of the wrapping reflects the tightness between the wrapping layers and affects the capacitance characteristics of the cable. The fill factor is used to consider the filling degree of the cable's internal space, with a value range of 0.6 to 0.9. In wrapped insulated wires and cables, the fill factor is a key parameter, reflecting the tightness between the wrapping layers. Presetting an upper limit for the fill factor ensures that the gaps between the wrapping layers are not too large, thereby avoiding affecting the cable's capacitance and insulation performance. When the actual measured fill factor exceeds this preset upper limit, it indicates that the gaps between the wrapping layers are too large, resulting in abnormal capacitance.

[0084] In this embodiment, the calculation of the wrapped insulation capacitance value takes into account the effects of the winding angle, the non-uniform insulation coefficient of the wire and cable to be tested, the test frequency, the radial dimension, the circumferential angle between the insulation layer and the internal metal conductor, the tangential capacitance between the insulation layer and the internal metal conductor, and the wrapping fill factor on the capacitance value. The total capacitance value of the wrapped insulation is calculated based on these parameters. This model can more accurately reflect the capacitance characteristics of actual wires and cables, especially when there are many wrapping layers or the wrapping parameters vary greatly, and can more accurately calculate the capacitance value of the wire and cable.

[0085] In one embodiment, is the relative dielectric constant of the wire and cable to be tested, which is calculated using the following formula:

[0086]

[0087] in, is the test frequency, is the ambient temperature, is the temperature reference, and is the correction constant.

[0088] It should be noted that As the temperature reference, take It is 25 degrees Celsius. and is the correction constant, The value range is 0.04~0.05, The value range is 3 to 5.

[0089] In step S14, when the insulation type is overall insulation, calculation is performed based on the geometric parameters to obtain an overall insulation capacitance value and an overall insulation abnormality value.

[0090] In one embodiment, the overall insulation capacitance is calculated using the following formula:

[0091]

[0092] The overall insulation anomaly value is calculated using the following formula:

[0093]

[0094] in, is the relative dielectric constant of the copper core of the wire and cable to be tested, is the cross-sectional area of ​​the copper core of the wire and cable to be tested, is the outer diameter of the wire and cable to be tested, is the outer diameter of the outer layer of the wire and cable to be tested, is the relative dielectric constant of the insulation layer of the wire and cable to be tested, is the total thickness of the insulation layer of the wire and cable to be tested, It is the distance between the copper core and the insulation layer of the wire and cable to be tested. is the winding angle, is the fill factor, is the relative dielectric constant of the wire and cable to be tested, is the thickness of the insulation layer, is the number of stranded wire layers, is the strand coefficient, is the strand diameter, is the strand pitch.

[0095] It should be noted that It is the relative dielectric constant of the copper core of the wire and cable under test. It is a material property that indicates the copper core's response to electric fields. In capacitance calculations, it is used to adjust the capacitance value to reflect the dielectric properties of the copper core. It can be calculated by the following formula:

[0096]

[0097] in, is the dielectric constant of vacuum, which is approximately . The dielectric constant of copper relative to a vacuum. For copper, this value is 1.

[0098] It is the cross-sectional area of ​​the copper core of the wire and cable to be tested. This parameter is used to calculate the volume capacitance of the copper core, which directly affects the capacitance value. It is the outer diameter of the wire and cable to be tested. It is used to determine the overall size of the cable and is the basis for calculating the capacitance of the cable or other geometric parameters. It is the outer diameter of the outer layer of the wire and cable to be tested, which is used to calculate the thickness of the cable's insulation layer. It is the relative dielectric constant of the insulation layer of the wire and cable to be tested, which reflects the dielectric properties of the insulation material and is crucial to the calculation of the capacitance value. It is the total thickness of the insulation layer of the wire and cable to be tested. It is used to calculate the volume capacitance of the insulation layer and affects the capacitance value of the cable. This is the distance between the copper core and the insulation layer of the wire or cable being tested. For fully insulated wires and cables, this parameter is crucial for calculating the cable's capacitance, as it directly affects the distribution of the electric field. A preset reference distance serves as a benchmark for determining the insulation condition of the cable. If the actual measured distance exceeds the preset reference distance, it indicates a problem with the thickness or uniformity of the insulation layer, resulting in abnormal capacitance.

[0099] In this embodiment, the calculation formula of the overall insulation capacitance value takes into account the relative dielectric constant of the copper core, the cross-sectional area of ​​the copper core, the outer diameter of the wire and cable, the outer diameter of the outer layer of the wire and cable to be tested, the relative dielectric constant of the insulation layer, the total thickness of the insulation layer and the distance between the copper core and the insulation layer. The influence of these factors on the overall insulation capacitance value is taken into account. This model can more accurately reflect the overall capacitance characteristics of the actual wire and cable, and can perform a more accurate calculation of the overall capacitance value of the wire and cable.

[0100] In step S15, a summation operation is performed based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested;

[0101] It should be noted that the actual capacitance value of the wire and cable under test is a quantitative measure of the capacitance characteristics exhibited by the wire and cable as a capacitor under specific conditions. Capacitance is a physical quantity that measures the ability of a wire and cable to store charge. It depends on the wire and cable's geometry, material properties, and test environment. The actual capacitance value reflects the wire and cable's ability to store charge under the influence of an electric field. The higher the capacitance value, the greater the cable's charge storage capacity. The actual capacitance value of a wire and cable is affected by its geometry, including conductor size, insulation thickness, and number of wrapping layers. These geometric parameters affect the electric field distribution in the cable, thereby affecting the capacitance value. The material properties of the wire and cable, such as the relative dielectric constant of the conductor and insulation layer, also affect the actual capacitance value. The higher the relative dielectric constant, the greater the cable's capacitance value. The actual capacitance value is also affected by the test environment, including the test frequency and ambient temperature. Increasing frequency may lead to an increase in capacitance, while changes in temperature may alter the material's dielectric properties, thus affecting the capacitance value.

[0102] Preferably, the insulation performance of wires and cables can also be assessed by measuring their actual capacitance. Any discrepancy between the actual capacitance and the expected value indicates a defect or anomaly in the insulation layer. Actual capacitance is crucial to the design and application of wires and cables. In high-frequency applications, capacitance can affect signal transmission quality, requiring precise control. Measuring actual capacitance helps ensure the safety and reliability of wires and cables. By comparing it with standard or expected values, potential insulation issues can be detected, preventing failures and accidents.

[0103] The wrap insulation capacitance value is a key parameter for measuring the insulation performance of wire and cable wraps. Its impact on insulation performance primarily reflects the uniformity of the capacitance screen, dielectric strength, and electrical strength. Regarding capacitance screen uniformity, the wrap insulation capacitance value is closely related to the uniformity of the capacitance screen. By mechanically wrapping an organic insulating material around a tubular conductor and creating a set number of capacitance screens in layers to form a series of coaxial cylindrical capacitors, uniform radial and axial voltage distribution can be achieved, thereby improving dielectric strength and short-circuit resistance. Regarding dielectric strength, the wrap insulation capacitance value reflects the integrity and uniformity of the insulation layer. Abnormal capacitance values ​​indicate insulation defects, such as damaged insulation material or loose wrapping, which can reduce insulation performance and increase the risk of electrical failure. Regarding electrical strength, the wrap insulation capacitance value is related to the electrical strength of the main insulation. Protecting the main insulation with an organic composite sheath enhances electrical strength and uniformity of the surface potential distribution, improving resistance to harsh weather conditions. Therefore, the wrap insulation capacitance value has a direct impact on the insulation performance of wires and cables. It is not only related to the electrical safety of the cable but also a key indicator for evaluating and ensuring cable quality. By accurately measuring and analyzing the insulation capacitance of the wrap, the reliability and stability of wires and cables can be effectively improved.

[0104] Overall insulation capacitance is a key parameter for measuring the insulation performance of wires and cables. Its impact on wire and cable performance is primarily reflected in insulation quality assessment, voltage stability, signal transmission performance, thermal stability, and insulation material selection. Regarding insulation quality assessment, overall insulation capacitance indirectly reflects the quality of the insulation layer of a wire or cable. By measuring the capacitance of a cable, it is possible to assess the uniformity of the insulation layer and the presence of defects, such as uneven thickness or damage. Regarding voltage stability, in power transmission, the capacitance of a cable affects the voltage regulation of the line. Excessive cable capacitance can also affect line voltage stability. Regarding signal transmission performance, for communications cables, overall insulation capacitance affects signal transmission speed and quality. Capacitance directly affects signal transmission delay and characteristic impedance. Regarding thermal stability, overall insulation capacitance is related to the thermal stability of the cable. During cable operation, changes in capacitance generate heat, which affects the cable's thermal stability. Regarding insulation material selection, different insulation materials have different dielectric constants, which directly affect overall insulation capacitance. Selecting the appropriate insulation material can optimize the cable's capacitance performance and improve both its electrical and mechanical properties.

[0105] In step S16, the actual capacitance value is compared with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result including:

[0106] When the actual capacitance value is greater than the winding insulation abnormality value, the capacitance test result is winding insulation abnormality;

[0107] When the actual capacitance value is less than the overall insulation abnormality value, the capacitance test result is an overall abnormality;

[0108] When the actual capacitance value is greater than the overall insulation abnormality value, the capacitance test result is normal;

[0109] When the actual capacitance value is between the abnormal value of the winding insulation and the abnormal value of the overall insulation, the capacitance test result shows that both the winding and the overall insulation are abnormal.

[0110] It should be noted that the Wrap Insulation Abnormal Value is the preset maximum allowable capacitance value, and the Overall Insulation Abnormal Value is the preset minimum allowable capacitance value. When the actual capacitance value is greater than the Wrap Insulation Abnormal Value, it indicates that there are defects in the cable's wrapped insulation layer, such as damaged insulation material, uneven insulation thickness, or loose wrapping, resulting in an abnormally high capacitance value. When the actual capacitance value is less than the Overall Insulation Abnormal Value, it indicates that the cable's overall insulation performance has deteriorated, such as due to aging of the insulation material, damage to the insulation layer, or other factors that have caused an abnormally low capacitance value.

[0111] The following describes the working process of the present invention using a common scenario as an example. Figure 2, which is Figure 1 Schematic diagram of the working scenario of the method.

[0112] Step 1: Obtain geometric parameters, test frequency and ambient temperature;

[0113] Through measurement and design specifications, the geometric parameters of the wires and cables to be tested are obtained as follows:

[0114]

[0115] Test frequency: Use a signal generator to select multiple frequency points from 50 Hz to 400 Hz for testing. Ambient temperature: The test environment is kept stable at 20 to 25°C and controlled by a temperature control device.

[0116] Step 2: Determine the insulation type. Determine the insulation type by analyzing the geometric parameters and analyzing the geometric structure: the stranded wire diameter shows multi-layer changes, and the winding angle =30°, indicating that the stranded wire has a spirally wound structure. Therefore, the insulation type is determined to be wrapped insulation.

[0117] Step 3: Calculate the insulation capacitance and insulation anomaly.

[0118] Relative dielectric constant of the wire and cable to be tested Calculation formula:

[0119]

[0120] Input parameters , , , degrees Celsius, degrees Celsius.

[0121] Calculation results:

[0122] 2.2

[0123] Calculate the insulation capacitance and insulation anomaly. The insulation capacitance calculation formula is:

[0124]

[0125] Input parameters: number of layers , the relative dielectric constant of the wire and cable to be tested , preset standard volume capacitance value of the wire and cable to be tested pF, winding angle , wrapping filling factor , 1 pF, , The first Radial dimensions of the layer wrapping, For the wires and cables to be tested The circumferential angle between the insulation layer and the inner metal conductor between the layer wraps.

[0126] Calculation results:

[0127]

[0128] Calculate the abnormal value of the insulation of the package. The calculation formula of the abnormal value of the insulation of the package is:

[0129]

[0130] Input parameters: Relative dielectric constant of the wire and cable to be tested , fill factor , outer diameter of insulation layer mm, inner diameter of the insulation layer mm, insulation layer height mm

[0131] Calculation results:

[0132]

[0133] Step 4: Calculate the overall insulation capacitance value and the overall insulation abnormality value. The overall insulation capacitance calculation formula is:

[0134]

[0135] Input parameters: relative dielectric constant of copper core , copper core cross-sectional area , the outer diameter of the wire and cable to be tested mm, outer diameter of the outer layer of the wire and cable to be tested mm, the distance between the copper core and the insulation layer of the wire and cable to be tested mm. , .

[0136] Calculation results:

[0137]

[0138] Calculate the overall insulation abnormality value. The calculation formula for the overall insulation abnormality value is:

[0139]

[0140] Input parameter: Fill factor , relative dielectric constant of the wire and cable to be tested , strand coefficient , Number of strands mm, strand pitch mm, thickness of insulation layer mm. °.

[0141] Calculation results:

[0142]

[0143] Step 5: Calculate the actual capacitance value. The actual capacitance value is the sum of the wrapping and overall capacitance values:

[0144]

[0145] Calculation results:

[0146]

[0147] Step 5: Determine the capacitance test results by comparing the actual capacitance value with the abnormal value: the actual capacitance value pF, wrapping abnormal value pF, overall outlier pF

[0148] Judgment result: , the wrapping insulation is abnormal. The overall insulation is normal. Test result: The insulation of the wire and cable wrap is abnormal.

[0149] In summary, the present invention discloses a capacitance testing method for medical equipment wires and cables, comprising:

[0150] Obtain the geometric parameters, test frequency, and ambient temperature of the wires and cables to be tested. Measure the geometric parameters using a micrometer and vernier caliper. The test frequency can be measured using a signal generator or frequency counter. Measure the ambient temperature using a temperature sensor or thermometer. These parameters provide the basis for subsequent calculations.

[0151] The insulation type of the wire or cable under test is determined based on the geometric parameters. When the insulation type is wrapped insulation, the wrapped insulation capacitance and wrapped insulation anomaly value are calculated based on the geometric parameters, the test frequency, and the ambient temperature. When the insulation type is integral insulation, the integral insulation capacitance and integral insulation anomaly value are calculated based on the geometric parameters. Measuring the wrapped insulation capacitance and integral insulation capacitance is crucial and forms the basis for determining capacitance anomalies.

[0152] According to the wrapped insulation capacitance value and the overall insulation capacitance value, a summation operation is performed to obtain the actual capacitance value of the wire and cable to be tested; the actual capacitance value is compared with the wrapped insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result. The present invention divides the wires and cables of complex and diverse medical equipment into two models: overall insulation and wrapped insulation according to geometric parameters. Instead of directly constructing the wire and cable as a model of a standard cylindrical capacitor. Directly constructing the wire and cable as a standard cylindrical capacitor model will ignore the influence of factors such as the winding angle, the circumferential angle between the insulation layer and the internal metal conductor, and the tangential capacitance between the insulation layer and the internal metal conductor on the capacitance value. Because different insulation types have different capacitance characteristics, calculating the capacitance value and abnormal value of different insulation types separately can ensure the accuracy of the capacitance value. Among them, the calculation of the wrapped insulation capacitance value takes into account the influence of the winding angle, the non-uniform insulation coefficient of the wire and cable to be tested, the test frequency, the radial dimension, the circumferential angle between the insulation layer and the internal metal conductor, the tangential capacitance between the insulation layer and the internal metal conductor, and the wrapping filling coefficient on the capacitance value. The calculation of the overall insulation capacitance value takes into account the relative dielectric constant of the copper core, the cross-sectional area of ​​the copper core, the outer diameter of the wire and cable, the outer diameter of the outer layer of the wire and cable to be tested, the relative dielectric constant of the insulation layer, the total thickness of the insulation layer and the distance between the copper core and the insulation layer on the overall insulation capacitance value. The actual capacitance value is then calculated to ensure the accuracy of the capacitance value calculation, improve the reliability and safety of the wire and cable, and ensure the safety and performance of medical equipment.

[0153] Reference Figure 2 A second embodiment of the present invention provides a capacitance testing system for medical device wires and cables, comprising:

[0154] A data acquisition module is used to obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested;

[0155] An insulation type judgment module is used to judge the insulation type of the wire and cable to be tested based on the geometric parameters;

[0156] a wrap insulation calculation module, which, when the insulation type is wrap insulation, calculates a wrap insulation capacitance value and a wrap insulation anomaly value based on the geometric parameters, the test frequency, and the ambient temperature;

[0157] an overall insulation calculation module, which, when the insulation type is overall insulation, performs calculations based on the geometric parameters to obtain an overall insulation capacitance value and an overall insulation anomaly value;

[0158] An actual capacitance value calculation module is used to perform a sum operation based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain the actual capacitance value of the wire and cable to be tested;

[0159] The test result output module is used to compare the actual capacitance value and the abnormal value of the winding insulation with the abnormal value of the overall insulation to obtain a capacitance test result.

[0160] It should be noted that the capacitance testing system for medical equipment wires and cables provided in an embodiment of the present invention is used to execute all process steps of the capacitance testing method for medical equipment wires and cables in the above embodiment. The working principles and beneficial effects of the two correspond one to one, so they will not be repeated here.

[0161] An embodiment of the present invention further provides an electronic device. The electronic device includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a capacitance test program for medical device wires and cables. When the processor executes the computer program, the steps of the above-mentioned various embodiments of the capacitance test method for medical device wires and cables are implemented, such as Figure 1 Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are realized, such as the capacitance abnormality calculation module.

[0162] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device.

[0163] The electronic device may be a computing device such as a desktop computer, notebook, PDA, or smart tablet. The electronic device may include, but is not limited to, a processor and memory. Those skilled in the art will appreciate that the aforementioned components are merely examples of electronic devices and do not constitute a limitation of the electronic device. The electronic device may include more or fewer components than those described above, or a combination of certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, and the like.

[0164] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the electronic device and connects various parts of the entire electronic device using various interfaces and lines.

[0165] The memory can be used to store the computer programs and / or modules. The processor implements the various functions of the electronic device by running or executing the computer programs and / or modules stored in the memory and accessing the data stored in the memory. The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as a sound playback function or an image playback function); the data storage area may store data generated based on the use of the mobile phone (such as audio data, a phone book, etc.). Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0166] If the module / unit integrated into the electronic device is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention can implement all or part of the process steps in the above-mentioned method embodiments by using a computer program to instruct the relevant hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium. It should be noted that the content of the computer-readable medium can be appropriately increased or decreased based on the requirements of legislation and patent practice in a jurisdiction. For example, in some jurisdictions, based on legislation and patent practice, computer-readable media does not include electric carrier signals and telecommunication signals.

[0167] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive effort.

[0168] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A method for testing the capacitance of medical equipment wires and cables, characterized in that: Executed by a computer, including: Obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested; Determine the insulation type of the wire and cable to be tested based on the geometric parameters; When the insulation type is wrapped insulation, the wrapped insulation capacitance value and the wrapped insulation abnormality value are calculated according to the geometric parameters, the test frequency and the ambient temperature; When the insulation type is overall insulation, calculation is performed based on the geometric parameters to obtain an overall insulation capacitance value and an overall insulation anomaly value; Performing a summation operation based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain an actual capacitance value of the wire and cable to be tested; The actual capacitance value is compared with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result.

2. The capacitance testing method for medical equipment wires and cables according to claim 1, characterized in that: The geometric parameters of the wire and cable to be tested include the outer diameter of the stranded wire, the inner diameter of the stranded wire, the diameter of the stranded wire, the winding angle, the thickness of the insulation layer, the number of stranded wire layers, the outer diameter of the insulation layer, the inner diameter of the insulation layer, the stranding coefficient and the stranding pitch of the wire and cable to be tested.

3. The capacitance testing method for medical equipment wires and cables according to claim 2, characterized in that: The step of determining the insulation type of the wire or cable to be tested based on the geometric parameters includes: Analyzing the outer diameter, inner diameter, diameter and pitch of the stranded wire to obtain geometric structural characteristics; When the geometric structure feature shows a multi-layer structure and includes a spiral shape, the insulation type of the wire and cable to be tested is wrapped insulation; When the geometric structure feature is a single structure, the insulation type of the wire and cable to be tested is integral insulation.

4. The capacitance testing method for medical equipment wires and cables according to claim 1, characterized in that: The calculating of the winding insulation abnormality value according to the geometric parameter, the test frequency and the ambient temperature includes: Calculating the relative dielectric constant of the wire and cable to be tested according to the test frequency and the ambient temperature; Calculate the wrapping insulation abnormality value according to the relative dielectric constant and the geometric parameters; The insulation capacitance of the wrap is calculated using the following formula: The abnormal value of the insulation is calculated by the following formula: in, is the relative dielectric constant of the wire and cable to be tested, is the preset standard volume capacitance value of the wire and cable to be tested, is the non-uniform insulation coefficient of the wire and cable to be tested, The first Radial dimensions of the layer wrapping, For the wires and cables to be tested The circumferential angle between the insulation layer and the inner metal conductor between the layer wraps, is the average radial dimension of the cable to be tested, For the wires and cables to be tested The tangential capacitance between the insulation layer and the inner metal conductor between the layer wraps, is the wrapping filling factor, For the wires and cables to be tested Layer wrapping and The axial dimension of the insulation layer between the layers of wrapping, is the fill factor, is the height of the insulation layer, is the inner diameter of the insulation layer, is the outer diameter of the insulation layer.

5. The capacitance testing method for medical equipment wires and cables according to claim 1, characterized in that: The calculation based on the geometric parameters to obtain the overall insulation capacitance value and the overall insulation abnormality value includes: The overall insulation capacitance is calculated using the following formula: The overall insulation anomaly value is calculated using the following formula: in, is the relative dielectric constant of the copper core of the wire and cable to be tested, is the cross-sectional area of ​​the copper core of the wire and cable to be tested, is the outer diameter of the wire and cable to be tested, is the outer diameter of the outer layer of the wire and cable to be tested, is the relative dielectric constant of the insulation layer of the wire and cable to be tested, is the total thickness of the insulation layer of the wire and cable to be tested, It is the distance between the copper core and the insulation layer of the wire and cable to be tested. is the winding angle, is the fill factor, is the relative dielectric constant of the wire and cable to be tested, is the thickness of the insulation layer, is the number of stranded wire layers, is the strand coefficient, is the strand diameter, is the strand pitch.

6. The capacitance testing method for medical equipment wires and cables according to claim 4, characterized in that: The step of calculating the relative dielectric constant of the wire and cable to be tested according to the test frequency and the ambient temperature includes: The relative dielectric constant is calculated using the following formula: in, is the test frequency, is the ambient temperature, is the temperature reference, and is the correction constant.

7. The capacitance testing method for medical equipment wires and cables according to claim 1, characterized in that: The comparing the actual capacitance value with the winding insulation abnormality value and the overall insulation abnormality value to obtain a capacitance test result includes: When the actual capacitance value is greater than the winding insulation abnormality value, the capacitance test result is winding insulation abnormality; When the actual capacitance value is less than the overall insulation abnormality value, the capacitance test result is an overall abnormality; When the actual capacitance value is greater than the overall insulation abnormality value, the capacitance test result is normal; When the actual capacitance value is between the abnormal value of the winding insulation and the abnormal value of the overall insulation, the capacitance test result shows that both the winding and the overall insulation are abnormal.

8. A capacitance testing system for medical equipment wires and cables, characterized in that: include: A data acquisition module is used to obtain the geometric parameters, test frequency and ambient temperature of the wires and cables to be tested; An insulation type judgment module is used to judge the insulation type of the wire and cable to be tested based on the geometric parameters; a wrap insulation calculation module, which, when the insulation type is wrap insulation, calculates a wrap insulation capacitance value and a wrap insulation anomaly value based on the geometric parameters, the test frequency, and the ambient temperature; an overall insulation calculation module, which, when the insulation type is overall insulation, performs calculations based on the geometric parameters to obtain an overall insulation capacitance value and an overall insulation anomaly value; An actual capacitance value calculation module is used to perform a sum operation based on the wrapped insulation capacitance value and the overall insulation capacitance value to obtain the actual capacitance value of the wire and cable to be tested; The test result output module is used to compare the actual capacitance value and the abnormal value of the winding insulation with the abnormal value of the overall insulation to obtain a capacitance test result.

9. An electronic device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the capacitance testing method for medical device wires and cables as described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the capacitance testing method for medical device wires and cables according to any one of claims 1 to 7.

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