An endoscope

Abstract

The present invention discloses an endoscope, and relates to the technical field of medical devices. The endoscope comprises: an insertion part, a cable, and a traction rope. By connecting the cable to an electrical component at the distal end of an active bending section in the insertion part, and connecting a traction rope made of a magnetic shielding material to the active bending section, and arranging the traction rope to wrap at least a portion of the outer circumference of the cable, the traction rope can play a shielding role, and thus can reduce the effect of the cable wrapped inside the traction rope being disturbed by the external magnetic field. In addition, since the cable and the traction rope are coaxially arranged, and the cable is arranged inside the traction rope, this is also conducive to reducing the space occupied by the cable and the traction rope, and thus is conducive to reducing the size of the entire insertion part.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to an endoscope. Background Art

[0002] An endoscope is a commonly used medical device used to directly access the natural passages of the human body, providing doctors with sufficient diagnostic information to treat disease.

[0003] Usually, endoscopes are used in conjunction with other electronic instruments to assist the operator in inspecting the patient's natural channels. These electronic instruments will generate a magnetic field to the surrounding environment when powered on, and the electrons in human cells are constantly moving, and this movement will generate a weak magnetic field. In addition, physiological processes such as the human heartbeat, blood circulation, and nerve activity will generate bioelectricity, which will also form a magnetic field around the human body. When the endoscope enters the patient's body for inspection, the inspection information needs to be transmitted to the terminal device via a cable. During this process, the environment where the insertion part of the endoscope is located will be affected by the aforementioned magnetic field, so the endoscope will have difficulty accurately transmitting the inspection information back to the terminal device. Summary of the invention

[0004] The present invention discloses an endoscope to at least partially improve the above problems.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] An embodiment of the present application provides an endoscope, comprising: an insertion portion, a cable, and a traction rope. The insertion portion comprises an active bending section and an electrical component disposed at the distal end of the active bending section. The cable extends from the proximal end of the insertion portion to the distal end of the insertion portion and is connected to the electrical component. The traction rope extends along the active bending section and is connected to the distal end of the active bending section, and the traction rope is used to drive the active bending section to bend; at least a portion of the traction rope is made of a magnetic shielding material, and the traction rope extends along the cable and covers at least a portion of the outer circumference of the cable.

[0007] In one embodiment, the endoscope further includes: a handle portion, the handle portion is connected to the insertion portion, a rotating wheel is provided in the handle portion, the traction rope extends into the handle portion and is connected to the rotating wheel, the traction rope is provided with an opening, the opening is located in the handle portion, and the opening is used for the cable to extend out.

[0008] In one embodiment, the opening is located on a side of the rotating wheel close to the distal end.

[0009] In one embodiment, the traction rope includes a rope body and a structural member, the structural member is connected to the middle portion of the rope body, the opening is arranged in the structural member, and the structural member has a redundant space for accommodating the cable.

[0010] In one embodiment, the structural member includes: a first structural portion and a second structural portion, and the first structural portion and the second structural portion are threadedly connected.

[0011] In one embodiment, the endoscope further comprises a shielding layer, the shielding layer being wrapped around an outer surface of the cable extending out of the traction rope;

[0012] Alternatively, a first shielding cavity is further provided in the handle portion, the first shielding cavity is connected to the opening, and the first shielding cavity is used to accommodate the cable extending out of the traction rope.

[0013] In one embodiment, the endoscope further includes: a circuit board. A second shielding cavity is further provided in the handle portion. The circuit board is provided in the second shielding cavity. The circuit board is electrically connected to the cable.

[0014] In one embodiment, a first shielding cavity is further provided in the handle portion, and the first shielding cavity is connected to the opening. The endoscope also includes: a circuit board. A second shielding cavity is further provided in the handle portion, and the circuit board is arranged in the second shielding cavity. The circuit board is electrically connected to the cable, and the first shielding cavity is connected to the second shielding cavity.

[0015] In one embodiment, the cable includes a signal line and a power line, and the signal line and the power line are symmetrically arranged in a radial direction of the active bending section.

[0016] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0017] The endoscope provided by the embodiment of the present application is connected to the electrical component at the far end of the active bending section in the insertion part by connecting the cable to the electrical component, and connecting the traction rope made of magnetic shielding material to the active bending section, and the traction rope is arranged to be wrapped around at least part of the outer periphery of the cable, so that the traction rope can play a shielding role, and thus can reduce the effect of the cable wrapped inside the traction rope being disturbed by the external magnetic field. At the same time, since the traction rope is only connected to the active bending section, and the cable is connected to the electrical component, when the traction rope is pulled to drive the active bending section to bend, the pulling force is mainly concentrated on the traction rope, which is beneficial to reducing the force on the cable, and thus is beneficial to avoiding the possibility of the cable being broken due to excessive force. In addition, since the cable and the traction rope are coaxially arranged, and the cable is arranged inside the traction rope, there is no need to set a shielding structure on the outer periphery of the cable, which is beneficial to reducing the space occupied by the cable and the traction rope, and thus is beneficial to reducing the size of the entire insertion part, and solves the problem that the environment of the insertion part of the endoscope in the prior art is affected by the aforementioned magnetic field, so the endoscope will be difficult to accurately transmit the inspection information back to the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of an endoscope in one embodiment of the present application is shown.

[0020] Figure 2 yes Figure 1 A cross-sectional view of a portion of the structure.

[0021] Figure 3 A schematic structural diagram of an insertion portion in an endoscope in one embodiment of the present application is shown.

[0022] Figure 4 A partial structural schematic diagram of an insertion portion of an endoscope in an embodiment of the present application is shown.

[0023] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0024] Figure 6 A schematic diagram of the structure of a structural component in an endoscope in one embodiment of the present application is shown.

[0025] Figure 7A schematic diagram showing a matching method between a cable and a structural component in an endoscope in one embodiment of the present application is shown.

[0026] Figure 8 A schematic diagram showing another matching method between a cable and a structural member in an endoscope in one embodiment of the present application is shown.

[0027] Fig. 9 A schematic diagram showing another matching method between a cable and a structural member in an endoscope in an embodiment of the present application is shown.

[0028] Fig.10 yes Figure 2 Enlarged view of point A in the middle.

[0029] In the figure: endoscope 1, insertion part 10, active bending section 110, electrical component 120, passive bending section 130, front end seat 140, cable 20, signal line 210, power line 220, traction rope 30, opening 310, rope body 320, structural member 330, first structural part 331, second structural part 332, redundant space 340, handle part 40, rotating wheel 410, first shielding cavity 420, second shielding cavity 430, shielding layer 50, circuit board 60. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0031] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0032] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of each component relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0033] The inventive concept of the present application is described here:

[0034] An endoscope is a commonly used medical device used to directly access the natural passages of the human body, providing doctors with sufficient diagnostic information to treat disease.

[0035] Usually, endoscopes are used in conjunction with other electronic instruments to assist the operator in inspecting the patient's natural channels. These electronic instruments will generate a magnetic field to the surrounding environment after being powered on, and the electrons in human cells are constantly moving, and this movement will generate a weak magnetic field. In addition, physiological processes such as the human heartbeat, blood circulation, and nerve activity will generate bioelectricity, which will also form a magnetic field around the human body. When the endoscope enters the patient's body for inspection, it is necessary to transmit the inspection information to the terminal device through a cable. During this process, the environment in which the insertion part of the endoscope is located will be affected by the aforementioned magnetic field. It is understandable that the size of the endoscope is originally small, and the size of the cable in the endoscope will only be smaller, which will cause the cable to be very susceptible to the surrounding magnetic field. Even if the magnetic field in the surrounding environment is very weak, it will cause the signal at the terminal of the cable transmission to fluctuate, affecting the operator's judgment. Therefore, the endoscope will have difficulty in accurately transmitting the inspection information back to the terminal device.

[0036] Based on this, the inventor provides an endoscope, which arranges the cable and the traction rope to be coaxial in a partial area and arranges the cable inside the traction rope, so that there is no need to set an additional shielding structure for the cable, so as to reduce the size of the entire insertion part and reduce the interference of the cable by the external magnetic field.

[0037] The following is combined with Figures 1 to 10 , the endoscope provided in this application is described in detail through specific embodiments and their application scenarios.

[0038] Please also see Figure 1 and Figure 2 The embodiment of the present application provides an endoscope 1, which may include: an insertion portion 10, a cable (not shown in the figure), and a traction rope 30. The cable and the traction rope 30 may be arranged inside the insertion portion 10, and at least part of the cable may be located inside the traction rope 30 to improve the cable's ability to resist magnetic field interference.

[0039] For details, please also refer to Figure 3 and Figure 4 The insertion portion 10 may include an active bending section 110, a passive bending section 130, and a front end seat 140. The active bending section 110 may be disposed between the passive bending section 130 and the front end seat 140, and an electrical component 120 may be disposed at the distal end of the active bending section 110, and specifically, the electrical component 120 may be disposed on the front end seat 140.

[0040] The cable can extend from the proximal end of the insertion part 10 to the distal end of the insertion part 10 and be connected to the electrical component 120. The cable can be used to transmit the signal obtained by the electrical component 120 to the terminal device, and cooperate with other terminal devices such as a display to convert the aforementioned signal into sound information or image information that can be used for judgment by the operator.

[0041] It should be noted that, generally, there are multiple electrical components 120 in the endoscope 1, for example, there may be a component for lighting, there may also be a component for acquiring images, there may also be a component for acquiring sounds, etc., which may be specifically set according to actual conditions and are not limited here. Each electrical component 120 is connected by a set of cables for power supply or data transmission. In this embodiment, two electrical components 120 are provided and two sets of cables are provided as an example for description.

[0042] See also Figure 5 Specifically, the cable 20 may include a signal line 210 and a power line 220, wherein the signal line 210 and the power line 220 may be respectively connected to two different electrical components 120. In this embodiment, the signal line 210 and the power line 220 may be symmetrically arranged in the radial direction of the active bending section 110. In this way, the distance between the signal line 210 and the power line 220 can be maximized, thereby facilitating the reduction of the mutual influence between the signal line 210 and the power line 220.

[0043] The traction rope 30 can extend along the active bending section 110 and be connected to the distal end of the active bending section 110, specifically connected to the front end seat 140, and the traction rope 30 can be used to drive the active bending section 110 to bend. In this embodiment, at least part of the traction rope 30 can be made of magnetic shielding material, for example, metal, such as copper, aluminum, etc., can be used, and for example, intrinsic conductive polymers, such as polyacetylene, polyaniline, etc. can be used, and can be specifically set according to actual conditions. And the traction rope 30 can extend along the cable 20 and be coated on at least part of the outer periphery of the cable 20 to play a role in shielding the magnetic field around the cable 20. In this embodiment, since the traction rope 30 has a shielding function, there is no need to set an additional shielding structure for the cable 20, which is conducive to reducing the space occupied by the cable 20 and the traction rope 30, and then it is conducive to reducing the size of the entire insertion part 10.

[0044] It should be noted that the embodiment of the present application does not limit the specific form of the traction rope 30. For example, in one embodiment, the traction rope 30 can also be set to the form of a braided rope. For example, in another embodiment, the traction rope 30 can also be set to the form of a tubular structure. The specific setting can be based on actual conditions.

[0045] For further information, please refer again to Figure 2 In some embodiments, the endoscope 1 may further include a handle portion 40, which may be connected to the insertion portion 10, and specifically may be connected to the passive bending section 130. The embodiment of the present application does not limit the specific structure and form of the handle portion 40. A rotating wheel 410 may be provided in the handle portion 40, and the traction rope 30 may extend into the handle portion 40 and be connected to the rotating wheel 410. The operator may control the bending of the active bending section 110 by turning the rotating wheel 410. In this embodiment, the traction rope 30 may be provided with an opening 310, and the opening 310 is located in the handle portion 40, and the opening 310 may be used for the cable 20 to extend.

[0046] The embodiment of the present application does not limit the specific form of the opening 310. For example, in one embodiment, the opening 310 can be set as a circular hole, which can better match the surface of the cable 20, thereby helping to reduce the friction between the cable 20 and the opening 310. For example, in other embodiments, the opening 310 can also be set to other shapes, and the size of the opening 310 can be slightly larger than the size of the cable 20, which can also reduce the friction between the cable 20 and the opening 310. It is understandable that the size of the opening 310 should not be set too large to avoid weakening the shielding effect of the traction rope 30.

[0047] It is understandable that, since the traction rope 30 needs to be subjected to external tension to drive the active bending section 110 to bend, if the cable 20 is always set in the traction rope 30, it is equivalent to the traction rope 30 and the cable 20 jointly bearing the external tension, which will lead to the risk of the cable 20 breaking. When the cable 20 extends out of the opening 310, it is equivalent to the traction rope 30 only serving as a channel for the cable 20 to shuttle. At this time, when the traction rope 30 is pulled, the cable 20 is subjected to a smaller friction force brought by the traction rope 30, which can reduce the risk of the cable 20 breaking. In a more specific embodiment, the opening 310 can be located on the side close to the distal end of the rotating wheel 410, which can further reduce the risk of the cable 20 breaking.

[0048] In addition, in one embodiment, the traction rope 30 may include a rope body 320 and a structural member 330, wherein the structural member 330 is connected to the middle of the rope body 320, the opening 310 may be provided in the structural member 330, and the structural member 330 may have a redundant space 340 for accommodating the cable 20. It should be noted that the embodiment of the present application does not limit the specific structure and form of the structural member 330. For example, in one embodiment, the size of the structural member 330 may be larger than the size of the rope body 320, so that the area of ​​the redundant space 340 can be increased, and thus a longer cable 20 can be accommodated. In this embodiment, the opening 310 may also be set larger, so that the cable 20 has sufficient space to extend from the opening 310, avoiding contact between the cable 20 and the opening 310 of the structural member 330, or reducing the contact area between the cable 20 and the opening 310 of the structural member 330, thereby facilitating the reduction of friction between the cable 20 and the opening 310. Furthermore, in one embodiment, the mechanism and the rope body 320 may be configured to be detachable, so that it is convenient to install the cable 20 on the traction rope 30 and to connect the traction rope 30 to the rotating wheel 410 .

[0049] For further information, please also refer to Figure 6 and Figure 7 In one embodiment, the structural member 330 may include a first structural portion 331 and a second structural portion 332, wherein the first structural portion 331 and the second structural portion 332 may be configured to be threadedly connected, so that the tension of the traction rope 30 can be adjusted, thereby facilitating the control of the bending of the active bending section 110. It should be noted that in this embodiment, the opening 310 may be provided in the threaded portion. Since the threaded portion is threadedly connected, its structural strength is higher. If the opening 310 is provided in other parts, the structural strength of other parts will be reduced.

[0050] After the cable 20 extends out of the opening 310 of the traction rope 30, a magnetic field shielding structure may be further provided to prevent the cable 20 extending out of the traction rope 30 from being affected by the external magnetic field. Figure 8 For example, in one embodiment, the endoscope 1 may further include a shielding layer 50, which may be wrapped around the outer surface of the cable 20 extending from the traction rope 30, so as to further ensure that the cable 20 is not affected by the external magnetic field. The embodiment of the present application does not limit the specific structure of the shielding layer 50, for example, the material of the shielding layer 50 may be the same as that of the traction rope 30, and the details may refer to the related description of the traction rope 30 mentioned above, which will not be repeated here.

[0051] See also Fig. 9For example, in another embodiment, a first shielding cavity 420 may be further provided in the handle portion 40, and the first shielding cavity 420 may be used to accommodate the cable 20 extending out of the traction rope 30. The embodiment of the present application does not limit the arrangement of the first shielding cavity 420. For example, the first shielding cavity 420 may be docked with the opening 310, and the cable 20 extending out of the traction rope 30 may directly enter the first shielding cavity 420. For another example, the structural member 330 may be directly provided in the first shielding cavity 420, so that the cable 20 extending out of the traction rope 30 may enter the first shielding cavity 420. The specific form may be set according to the actual situation.

[0052] For further information, please also refer to Figure 2 and Fig.10 In one embodiment, the endoscope 1 may further include a circuit board 60, a second shielding cavity 430 may be provided in the handle portion 40, the circuit board 60 may be provided in the second shielding cavity 430, and the cable 20 may be electrically connected to the circuit board 60. Placing the circuit board 60 in the second shielding cavity 430 may also reduce the influence of the magnetic field in the external environment on the circuit board 60.

[0053] The embodiment of the present application does not limit the specific arrangement and structure of the first shielding cavity 420 and the second shielding cavity 430. For example, in one embodiment, the first shielding cavity 420 and the second shielding cavity 430 can be arranged side by side, which can reduce the length of the cable 20. Further, in this embodiment, the first shielding cavity 420 can be connected with the second shielding cavity 430, which can further reduce the length of the cable 20. The embodiment of the present application does not limit the communication mode between the first shielding cavity 420 and the second shielding cavity 430. For example, in one embodiment, the second shielding cavity 430 can be arranged inside the first shielding cavity 420. For example, in another embodiment, the first shielding cavity 420 and the second shielding cavity 430 can be the same structure, which can not only reduce the length of the cable 20, but also reduce the size of the entire handle 40.

[0054] In addition, in some embodiments, the first shielding cavity 420 and the second shielding cavity 430 can also be configured to be integrally formed with the handle portion 40, so that the structural strength of the entire first shielding cavity 420 and the second shielding cavity 430 can be improved, thereby preventing the friction force generated by the traction rope 30 or the cable 20 on the first shielding cavity 420 and the second shielding cavity 430 when the operator pulls the traction rope 30, causing the first shielding cavity 420 and the second shielding cavity 430 to be displaced, thereby making it difficult for the first shielding cavity 420 and the second shielding cavity 430 to play a shielding role.

[0055] In addition, in some embodiments, the endoscope 1 may also include a signal amplifier, which may be connected to the circuit board 60 and disposed in the second shielding cavity 430. It is understandable that the signal amplifier may be used to amplify the signal transmitted by the cable 20, and then may be used to assist the operator in making a more accurate judgment on the detection result. Therefore, we hope that the amplified signal is a useful signal rather than a signal interfered with by the magnetic field. Therefore, arranging the signal amplifier in the second shielding cavity 430 can prevent the signal amplifier from being affected by the surrounding magnetic field. It should be noted that the embodiment of the present application does not limit the specific form of the signal amplifier, and it can be specifically set according to actual conditions.

[0056] In summary, the endoscope 1 provided in the embodiment of the present application connects the cable 20 to the electrical component 120 at the distal end of the active bending section 110 in the insertion portion 10, and connects the traction rope 30 made of magnetic shielding material to the active bending section 110, and the traction rope 30 is set to wrap at least part of the outer periphery of the cable 20, so that the traction rope 30 can play a shielding role, thereby reducing the effect of the cable 20 wrapped inside the traction rope 30 being disturbed by the external magnetic field. At the same time, since the traction rope 30 is only connected to the active bending section 110, and the cable 20 is connected to the electrical component 120, when the traction rope 30 is pulled to drive the active bending section 110 to bend, the pulling force is mainly concentrated on the traction rope 30, which is beneficial to reduce the force on the cable 20, and is beneficial to avoid the possibility of the cable 20 being broken due to excessive force. In addition, since the cable 20 and the traction rope 30 are coaxially arranged and the cable 20 is arranged inside the traction rope 30, this is also beneficial to reducing the space occupied by the cable 20 and the traction rope 30, which is beneficial to reducing the size of the entire insertion portion 10, thereby solving the problem in the prior art that the environment in which the insertion portion 10 of the endoscope 1 is located is affected by the aforementioned magnetic field, so that the endoscope 1 will have difficulty in accurately transmitting the inspection information back to the terminal device.

[0057] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0058] In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0059] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An endoscope, characterized in that: include: An insertion portion, the insertion portion comprising an active bending section and an electrical element disposed at a distal end of the active bending section; A cable, the cable extending from the proximal end of the insertion portion to the distal end of the insertion portion and connected to the electrical component; as well as, A traction rope, the traction rope extends along the active bending section and is connected to the distal end of the active bending section, the traction rope is used to drive the active bending section to bend; The area of ​​the traction rope located at the insertion portion is made of magnetic shielding material, and the traction rope extends along the cable and covers at least a portion of the outer circumference of the cable; The endoscope further includes: a handle portion, the handle portion is connected to the insertion portion, a rotating wheel is arranged in the handle portion, the traction rope extends into the handle portion and is connected to the rotating wheel, the traction rope is provided with an opening, the opening is located in the handle portion, and the opening is used for the cable to extend out.

2. The endoscope according to claim 1, characterized in that The opening is located on a side of the rotating wheel close to the distal end.

3. The endoscope according to claim 2, characterized in that The traction rope includes a rope body and a structural member, wherein the structural member is connected to the middle portion of the rope body, the opening is arranged in the structural member, and the structural member has a redundant space for accommodating the cable.

4. The endoscope according to claim 3, characterized in that The structural member comprises: a first structural part and a second structural part, and the first structural part and the second structural part are threadedly connected.

5. The endoscope according to claim 1, characterized in that The traction rope includes a rope body and a structural member, wherein the structural member is connected to the middle portion of the rope body, the opening is arranged in the structural member, and the structural member has a redundant space for accommodating the cable.

6. The endoscope according to any one of claims 1 to 5, characterized in that: The endoscope further comprises a shielding layer, the shielding layer being wrapped around the outer surface of the cable extending out of the traction rope; Alternatively, a first shielding cavity is further provided in the handle portion, the first shielding cavity is connected to the opening, and the first shielding cavity is used to accommodate the cable extending out of the traction rope.

7. The endoscope according to claim 6, characterized in that The endoscope further includes: a circuit board. A second shielding cavity is further provided in the handle portion. The circuit board is provided in the second shielding cavity. The circuit board is electrically connected to the cable.

8. The endoscope according to claim 7, characterized in that A first shielding cavity is also provided in the handle part, and the first shielding cavity is connected to the opening. The endoscope also includes: a circuit board. A second shielding cavity is also provided in the handle part, and the circuit board is arranged in the second shielding cavity. The circuit board is electrically connected to the cable, and the first shielding cavity is communicated with the second shielding cavity.

9. The endoscope according to claim 1, characterized in that: The cable comprises a signal line and a power line, and the signal line and the power line are symmetrically arranged in a radial direction of the active bending section.

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