Electrophysiological catheter structure

Abstract

The utility model relates to an electrophysiological catheter structure. The electrophysiology catheter structure comprises an outer tube, an inner tube, an end, at least two electrode arms, a plurality of wires and a plurality of electrode rings, one end of the inner pipe extends into the outer pipe, and the inner pipe moves in the axial direction of the outer pipe; the end is connected with one end of the inner pipe away from the outer pipe; each electrode arm comprises a first main rod, a second main rod and two supporting rods, the first main rod and the second main rod are staggered in the axial direction of the outer pipe, one end of the first main rod is hinged to the outer pipe, the other end of the first main rod is hinged to one ends of the two supporting rods, one end of the second main rod is hinged to one supporting rod of every two adjacent electrode arms, and the other end of the second main rod is hinged to the other supporting rod. The second main rod is hinged with the end head; the wire sequentially passes through the outer pipe, the first main rod, the supporting rod and the second main rod, and the electrode arm and the outer pipe sleeve the wire; the electrode rings are connected to one, two or more of the first main rod, the second main rod and the supporting rod in a sleeving mode, and the electrode rings are electrically connected with the wire. According to the scheme, it can be ensured that the position of the electrode ring is relatively stable during use.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to electrophysiological catheter structures. Background Technology

[0002] The main devices related to cardiac electrophysiology interventional techniques include mapping catheters, ablation catheters, and other electrophysiological interventional devices. Among them, mapping catheters and most ablation catheters (radiofrequency ablation and pulsed field ablation) require metal electrodes as a medium for signal or energy transmission, and the shape and density of the electrodes have a great influence on the efficiency and effectiveness of mapping catheters and ablation catheters (radiofrequency ablation and pulsed field ablation).

[0003] Pulsed ablation utilizes a high-voltage pulsed electric field applied to tissues within the cardiac chamber. Under the influence of the pulsed electric field, the phospholipid bimolecules in the tissue cell membrane move and rearrange, forming irreversible electroporation, which in turn induces apoptosis, thereby eliminating and preventing the transmission of abnormal potentials.

[0004] Chinese patent CN202010226564.2 discloses a cardiac pulsed multipolar ablation catheter. Because this catheter is composed of strip-shaped electrode arms, when adjacent electrode arms are compressed, they tend to move closer together or even stick to each other, resulting in uneven electrode distribution. Some areas have high density while others have low density, leading to a discontinuous and uneven ablation area. If two electrode arms stick together, there is a risk of short circuit. Furthermore, each electrode arm of this cardiac pulsed multipolar ablation catheter has only one electrode, resulting in low space utilization and a limited ablation area. Utility Model Content

[0005] To address or partially address the problems existing in related technologies, this application provides an electrophysiological catheter structure that enables the electrode arm to be deployed in a specific direction, ensuring the relatively stable position of the electrode ring during use.

[0006] This application provides an electrophysiological catheter structure comprising an outer tube, an inner tube, a tip, at least two electrode arms, multiple leads, and multiple electrode rings; one end of the inner tube extends into the outer tube, and the inner tube moves axially along the outer tube; the tip is connected to the end of the inner tube away from the outer tube; each electrode arm comprises a first main rod, a second main rod, and two support rods, the first main rod and the second main rod being axially offset from the outer tube, one end of the first main rod being hinged to the outer tube, the other end of the first main rod being hinged to one end of each of the two support rods, one end of the second main rod being hinged to one of the support rods of two adjacent electrode arms, and the end of the second main rod away from the support rod being hinged to the tip; the leads sequentially pass through the outer tube, the first main rod, the support rods, and the second main rod, and the electrode arms and the outer tube are sleeved on the leads; the electrode rings are sleeved on one, two, or more of the first main rod, the second main rod, and the support rods, and the electrode rings are electrically connected to the leads.

[0007] Furthermore, the electrode ring includes a first ring, a second ring, and a third ring, which are electrically connected to the wire, respectively. The first ring is sleeved on the outside of the first main rod, the second ring is sleeved on the outside of the support rod, and the third ring is sleeved on the outside of the second main rod.

[0008] Furthermore, there are at least two first rings, and the first rings are spaced apart on the first main rod; and / or

[0009] There are at least two third rings, and the third rings are spaced apart on the second main rod.

[0010] Furthermore, at least one of the first rings is located on the side of the first main rod near the support rod; and / or

[0011] At least one of the third rings is located on the side of the second main rod near the support rod.

[0012] Furthermore, there are at least two second rings, which are spaced apart on the support rod.

[0013] Furthermore, the inner tube slides relative to the outer tube, thereby causing the electrode arm to extend away from the inner tube or retract towards the inner tube; when the electrode arm extends, the maximum distance from the support rod to the central axis of the inner tube is greater than 7.5 mm; when the electrode arm retracts, the minimum distance from the support rod to the central axis of the inner tube is less than 2.5 mm.

[0014] Furthermore, the cross-section of the support rod is circular or rectangular.

[0015] Furthermore, the cross-section of the first main rod is elliptical or rectangular, and the cross-section of the second main rod is elliptical or rectangular.

[0016] Furthermore, the cross-section of the electrode ring is circular, elliptical, oval, or rectangular.

[0017] Furthermore, the end is provided with a developing ring.

[0018] The technical solution provided in this application may include the following beneficial effects: by hinged at both ends of the support rod to the first main rod and the second main rod respectively, and the electrode ring sleeved on one, two or more of the first main rod, the second main rod and the support rod, the second main rod is rotated by the inner tube, so that the electrode arm can be extended or retracted. When the electrode arm is extended, it can be extended in a directional manner, so that the two electrode arms will not stick together. Each time the electrode arm is extended, the electrode ring will move in the same direction, ensuring that the position of the electrode ring is relatively stable during use, ensuring that the ablation area of ​​the electrode ring is uniform and continuous, and facilitating the anchoring of the electrode arm at the pulmonary vein orifice.

[0019] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0020] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0021] Figure 1 This is a schematic diagram of the electrophysiological catheter structure shown in the embodiments of this application;

[0022] Figure 2 This is an unfolded view of the electrode arm shown in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram showing the electrode arm when deployed, as illustrated in an embodiment of this application;

[0024] Figure 4 This is another structural schematic diagram of the electrode arm when it is deployed, as shown in the embodiments of this application;

[0025] Figure 5 This is a schematic diagram of an electrode arm with a plurality of electrode rings as shown in an embodiment of this application.

[0026] Reference numerals: outer tube 1; inner tube 2; end 3; electrode arm 4; first main rod 41; second main rod 42; support rod 43; electrode ring 5; first ring 51; second ring 52; third ring 53. Detailed Implementation

[0027] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0028] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] To address the aforementioned issues, this application provides an electrophysiological catheter structure that enables the electrode arm to be deployed in a specific orientation, ensuring the relative stability of the electrode ring position during use.

[0032] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the electrophysiological catheter structure shown in the embodiments of this application.

[0034] See Figure 1The electrophysiological catheter structure includes an outer tube 1, an inner tube 2, a tip 3, at least two electrode arms 4, multiple leads, and multiple electrode rings 5. The diameter of the inner tube 2 is smaller than the aperture of the outer tube 1, and one end of the inner tube 2 extends into the outer tube 1. The inner tube 2 can move axially along the outer tube 1. The tip 3 is connected to the end of the inner tube 2 away from the outer tube 1. When the inner tube 2 moves relative to the outer tube 1, the tip 3 moves with the inner tube 2.

[0035] Figure 2 This is an unfolded view of the electrode arm shown in an embodiment of this application.

[0036] See Figure 1 and Figure 2 The electrode arm 4 includes a first main rod 41, a second main rod 42, and two support rods 43. The first main rod 41 and the second main rod 42 are offset axially from the outer tube 1. One end of the first main rod 41 is hinged to the outer tube 1, allowing it to rotate back and forth relative to the outer tube 1 in a direction away from its central axis. The other end of the first main rod 41 is hinged to one end of each of the two support rods 43, allowing them to rotate relative to the first main rod 41. The two support rods 43 connected to the same first main rod 41 rotate in different directions. One end of the second main rod 42 is hinged to one of the support rods 43 of each of the two adjacent electrode arms 4. The end of the second main rod 42 away from the support rod 43 is hinged to an end cap 3, allowing it to rotate back and forth relative to the end cap 3 in a direction away from the central axis of the outer tube 1. When the electrophysiological catheter structure is not undergoing electrode ablation, the electrode arm 4 is in a state of being retracted towards the central axis of the inner tube 2. When electrode ablation is required, the inner tube 2 can be pulled to move it axially along the outer tube 1. The end 3 moves axially along the outer tube 1 with the inner tube 2, and the end 3 moves towards the outer tube 1. The first main rod 41 and the second main rod 42 rotate away from the central axis of the outer tube 1, and the support rod 43 rotates accordingly. The electrode arm 4 unfolds outward until the length direction of the first main rod 41 is perpendicular to the central axis of the outer tube 1, and the length direction of the second main rod 42 is perpendicular to the central axis of the outer tube 1. The multiple support rods 43 form a polygon or a circle, thus completing the unfolding of the electrode arm 4. Preferably, there are four electrode arms 4, and when the electrode arm 4 is unfolded, the multiple support rods 43 can form a circle.

[0037] See Figure 1 and Figure 2The conductor should have good conductivity and be able to withstand voltages above 1000V without breakdown. The conductor passes sequentially through the outer tube 1, the first main rod 41, the support rod 43, and the second main rod 42. The electrode arm 4 and the outer tube 1 are fitted over the conductor. The conductor can be bent, and it bends as the first main rod 41, the support rod 43, and the second main rod 42 rotate. At least one electrode ring 5 is a positive electrode, and at least one electrode ring 5 is a negative electrode. Different electric field configurations can be achieved by arranging the electrode rings 5 ​​with different polarities. The electrode rings 5 ​​are fitted over one, two, or more of the first main rod 41, the second main rod 42, and the support rod 43, and are electrically connected to the conductor. When the electrode arm 4 retracts, the electrode rings 5 ​​retract accordingly; when the electrode arm 4 unfolds, the electrode rings 5 ​​unfold accordingly. The electrode rings 5 ​​are fixed to the first main rod 41, the second main rod 42, or the support rod 43 by forging, which ensures the smoothness of the surface of the electrode arm 4 and reduces the overall diameter of the electrode arm 4, making the electrode arm 4 less resistant during use. In addition to ablation, electrode ring 5 also has mapping and stimulation functions.

[0038] This application hinges the two ends of the support rod 43 to the first main rod 41 and the second main rod 42 respectively, and the electrode ring 5 is sleeved on one, two or more of the first main rod 41, the second main rod 42 and the support rod 43. The inner tube 2 drives the second main rod 42 to rotate, so that the electrode arm 4 can be extended or retracted. When the electrode arm 4 is extended, it can be extended in a directional manner, so that the two electrode arms 4 will not stick together. Each time the electrode arm 4 is extended, the electrode ring 5 will move in the same direction, ensuring that the position of the electrode ring 5 is relatively stable during use, ensuring that the ablation area of ​​the electrode ring 5 is uniform and continuous, and facilitating the anchoring of the electrode arm 4 at the pulmonary vein orifice.

[0039] See Figure 1 and Figure 2 The electrode ring 5 includes a first ring 51, a second ring 52, and a third ring 53. The first ring 51, the second ring 52, and the third ring 53 are electrically connected to the wires. The first ring 51 is sleeved on the outside of the first main rod 41, and each first main rod 41 is connected to at least one first ring 51. The second ring 52 is sleeved on the outside of the support rod 43, and each support rod 43 is connected to at least one second ring 52. The third ring 53 is sleeved on the outside of the second main rod 42, and each second main rod 42 is connected to at least one third ring 53. This design can make full use of the space utilization when the electrode arm 4 is unfolded, increase the number of electrode rings 5 ​​that can be set, increase the area of ​​the ablation zone, reduce the number of operations of the electrode ring 5, and improve the ablation efficiency. When there are four electrode arms 4, when the electrode arms 4 are unfolded, multiple support rods 43 can form a circle, so that the electrode ring 5 can form a continuous and uniform electric field, thereby obtaining a uniform and continuous ablation area. Furthermore, the first ring 51 and the third ring 53 are staggered along the axial direction of the outer tube 1, which increases the ablation area and depth in the axial direction of the outer tube 1 and enhances the three-dimensional ablation effect of the electrode ring 5.

[0040] See Figure 1 and Figure 2 The inner tube 2 slides relative to the outer tube 1, thereby causing the electrode arm 4 to extend away from the inner tube 2 or retract towards the inner tube 2. When the electrode arm 4 is extended to its maximum extent, the first main rod 41 and the second main rod 42 are both perpendicular to the central axis of the outer tube 1, and the distance from the support rod 43 to the central axis of the inner tube 2 reaches its maximum distance, which is greater than 7.5 mm. When the electrode arm 4 is fixed at the pulmonary vein orifice, the support rod 43 can conform to the inner wall of the pulmonary vein, thereby providing support for the electrode arm 4 and facilitating the even distribution of the electrode rings 5 ​​at the pulmonary vein orifice without shifting to one side. When the electrode arm 4 is retracted, the distance from the support rod 43 to the central axis of the inner tube 2 reaches its minimum distance, which is less than 2.5 mm, facilitating the passage of the electrophysiological catheter structure in the blood vessel. In addition, within the size range, the electrode arm 4 can be equipped with 5 to 50 electrode rings 5 ​​as needed.

[0041] See Figure 1 and Figure 2 In some embodiments, at least one first ring 51 is located on the side of the first main rod 41 near the support rod 43. When the electrode arm 4 is extended, at least one first ring 51 is located at the outermost end of the first main rod 41. There is a first connecting point at the connection between the first main rod 41 and the support rod 43. The first connecting point is located at the same position as the first ring 51. When the electrode arm 4 is subjected to a force in the left-right direction, the first connecting point can restrain the electrode arm 4, ensuring the stability and support of the electrode arm 4 in the left-right direction. In some embodiments, at least one third ring 53 is located on the side of the second main rod 42 near the support rod 43. When the electrode arm 4 is extended, at least one second ring 52 is located at the outermost end of the second main rod 42. There is a second connecting point at the connection between the second main rod 42 and the support rod 43. The second connecting point is located at the same position as the third ring 53. When the electrode arm 4 is subjected to a force in the left-right direction, the second connecting point can restrain the electrode arm 4, ensuring the stability and support of the electrode arm 4 in the left-right direction. In some embodiments, at least one first ring 51 is located on the side of the first main rod 41 near the support rod 43, and at least one third ring 53 is located on the side of the second main rod 42 near the support rod 43. By placing one or both of the first ring 51 and the second ring 52 at a position away from the outer tube 1, the ablation area of ​​the electrode ring 5 can be increased, and the uniformity and continuity of the ablation area of ​​the electrode ring 5 can be ensured.

[0042] Figure 3 This is a schematic diagram showing the electrode arm when deployed, as illustrated in an embodiment of this application.

[0043] See Figure 3In some embodiments, there are at least two first rings 51, which are spaced apart on the first main rod 41, and at least two third rings 53, which are spaced apart on the second main rod 42. This design can increase the ablation area and depth of the electrode rings 5 ​​after the electrode arm 4 is unfolded, and it is possible to achieve ablation in one go without rotating the electrode rings 5, which greatly improves the ablation efficiency.

[0044] Figure 4 This is another schematic diagram of the electrode arm when it is deployed, as shown in the embodiments of this application.

[0045] See Figure 4 In some embodiments, there are at least two second rings 52, which are spaced apart on the support rod 43. This design can improve the ablation intensity of the outer electrode ring 5 when the electrode arm 4 is deployed, increase the density of the ring-shaped ablation area, and also increase the accuracy of the mapping function.

[0046] Figure 5 This is a schematic diagram of an electrode arm with a plurality of electrode rings as shown in an embodiment of this application.

[0047] See Figure 5 In some embodiments, there are at least two first rings 51, which are spaced apart on the first main rod 41; there are at least two third rings 53, which are spaced apart on the second main rod 42; and there are at least two second rings 52, which are spaced apart on the support rod 43. This design can increase the density of electrode rings 5 ​​on the electrode arm 4, further increase the ablation area and depth, and is more suitable for the mapping function.

[0048] See Figure 1-2 The first main rod 41, the second main rod 42, and the support rod 43 are made of PET, PVC, Pebax, or TPU to ensure good insulation and prevent wrinkling and breakage. The first main rod 41, the second main rod 42, and the support rod 43 can be solid or hollow. Different strengths of electrophysiological catheter structures can be designed based on the hardness of the materials used in the first main rod 41, the second main rod 42, and the support rod 43. When the first main rod 41, the second main rod 42, and the support rod 43 are solid, they enclose the conductor. When the first main rod 41, the second main rod 42, and the support rod 43 are hollow, the conductor is embedded within the first main rod 41, the second main rod 42, and the support rod 43, with gaps between the conductor and the inner walls of the first main rod 41, the second main rod 42, and the support rod 43.

[0049] See Figure 1-2The first main rod 41 has an elliptical or rectangular cross-section, and the second main rod 42 has an elliptical or rectangular cross-section. This ensures that the electrode arm 4 can stably expand radially into the low-tide outer tube 1, and that the first and second main rods 41 and 42 will not deviate laterally. Simultaneously, it provides good support, allowing the electrophysiological catheter structure to form a robust whole. This ensures the relative position of the electrode arm 4 and the electrode ring 5 remains stable, which is the basis for the uniform, stable, and continuous ablation area of ​​the electrode ring 5. When the cross-section of the first main rod 41 is rectangular, the width of the first main rod 41 is 1–5 mm, and the thickness is 0.5–3 mm; when the cross-section of the second main rod 42 is rectangular, the width of the second main rod 42 is 1–5 mm, and the thickness is 0.5–3 mm. The cross-section of the support rod 43 is circular or rectangular. When the cross-section of the support rod 43 is circular, the diameter of the cross-section of the support rod 43 is 0.5 to 3 mm; when the cross-section of the support rod 43 is rectangular, the width of the support rod 43 is 0.5 to 3 mm, and the thickness of the support rod 43 is 0.3 to 2 mm.

[0050] See Figure 1-2 The electrode ring 5 has a circular, elliptical, oval, or rectangular cross-section, and it must possess good corrosion resistance. In some embodiments, the second ring 52 has a circular or rectangular cross-section; when the second ring 52 has a circular cross-section, its diameter is 0.5–3 mm; when the second ring 52 has a rectangular cross-section, its width is 0.5–3 mm, and its thickness is 0.3–2 mm. In some embodiments, the third ring 53 has a circular, elliptical, or rectangular cross-section; when the third ring 53 has a rectangular cross-section, its width is 1–5 mm, and its thickness is 0.5–3 mm. An elliptical or circular third ring 53 can increase its surface area, thereby increasing the ablation region inside the third ring 53 and ensuring the area and continuity of the electric field inside the third ring 53.

[0051] See Figure 1-2 The end cap 3 may or may not have a contrast ring. When the end cap 3 has a contrast ring, if the end cap 3 is inside a blood vessel, the location of the end cap 3 and the electrode arm 4 can be determined by taking an X-ray of the patient. In some embodiments, the end cap 3 is fused to the second main rod 42. Because the second main rod 42 is thinner, it can rotate relative to the end cap 3. In some embodiments, the connection between the end cap 3 and the inner tube 2 is achieved through a single heat fusion process, and the connection between the outer tube 1 and the first main rod 41 is also achieved through a single heat fusion process, thereby reducing the manufacturing process and improving manufacturing efficiency. Since the first main rod 41 is thinner and has lower hardness, it can rotate relative to the outer tube 1.

[0052] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0053] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An electrophysiological catheter structure, characterized in that, include: outer tube; An inner tube, one end of which extends into the outer tube, and the inner tube moves axially along the outer tube; The end is connected to the end of the inner tube that is away from the outer tube; At least two electrode arms, each electrode arm comprising a first main rod, a second main rod, and two support rods, wherein the first main rod and the second main rod are axially offset from the outer tube, one end of the first main rod is hinged to the outer tube, the other end of the first main rod is hinged to one end of each of the two support rods, one end of the second main rod is hinged to one of the support rods of two adjacent electrode arms, and the end of the second main rod away from the support rod is hinged to the end cap; Multiple wires are provided, which pass sequentially through the outer tube, the first main rod, the support rod, and the second main rod. The electrode arm and the outer tube are sleeved over the wires. Multiple electrode rings are fitted around one, two, or more of the first main rod, the second main rod, and the support rod, and the electrode rings are electrically connected to the wires.

2. The electrophysiological catheter structure according to claim 1, characterized in that: The electrode ring includes a first ring, a second ring, and a third ring. The first ring, the second ring, and the third ring are electrically connected to the wire. The first ring is sleeved on the outside of the first main rod, the second ring is sleeved on the outside of the support rod, and the third ring is sleeved on the outside of the second main rod.

3. The electrophysiological catheter structure according to claim 2, characterized in that: There are at least two first rings, and the first rings are spaced apart on the first main rod; and / or There are at least two third rings, and the third rings are spaced apart on the second main rod.

4. The electrophysiological catheter structure according to claim 2, characterized in that: At least one of the first rings is located on the side of the first main rod near the support rod; and / or At least one of the third rings is located on the side of the second main rod near the support rod.

5. The electrophysiological catheter structure according to claim 2, 3 or 4, characterized in that: There are at least two second rings, which are spaced apart on the support rod.

6. The electrophysiological catheter structure according to claim 1, characterized in that: The inner tube slides relative to the outer tube, thereby causing the electrode arm to extend away from the inner tube or retract towards the inner tube; when the electrode arm extends, the maximum distance from the support rod to the central axis of the inner tube is greater than 7.5 mm; when the electrode arm retracts, the minimum distance from the support rod to the central axis of the inner tube is less than 2.5 mm.

7. The electrophysiological catheter structure according to claim 1, characterized in that: The cross-section of the support rod is circular or rectangular.

8. The electrophysiological catheter structure according to claim 1, characterized in that: The first main rod has an elliptical or rectangular cross-section, and the second main rod has an elliptical or rectangular cross-section.

9. The electrophysiological catheter structure according to claim 1, characterized in that: The cross-section of the electrode ring is circular, elliptical, oval, or rectangular.

10. The electrophysiological catheter structure according to claim 1, characterized in that: The end is provided with a developing ring.

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