Electrode assembly, electrophysiological catheter and electrophysiological system

Abstract

The present invention provides an electrode assembly, an electrophysiological catheter and an electrophysiological system. The electrode assembly includes an electrode body, a sub-electrode assembly and an electrical transmission line arranged on the electrode body. The electrical transmission line includes a plurality of ablation lines. The sub-electrode assembly includes a plurality of first ablation electrodes and a plurality of second ablation electrodes. The ablation line includes a main transmission path, a first transmission branch and a second transmission branch. The first ablation electrode and the second ablation electrode are respectively electrically connected to the output ends of the corresponding first transmission branch and the second transmission branch. The input ends of the first transmission branch and the second transmission branch meet at the main transmission path. By setting the transmission branches of different ablation electrodes in parallel, the resistance value of the ablation line is reduced, the current-carrying capacity of the ablation line is improved, and at the same time, the ablation boundary of the catheter is improved and the ablation depth is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly relates to an electrode assembly, an electrophysiological catheter and an electrophysiological system. Background Art

[0002] In the field of electrophysiological therapy, it is a common means to use an electrophysiological catheter to transmit energy for tissue ablation. Specifically, the electrophysiological catheter includes a catheter and an electrode assembly disposed at the head end of the catheter. After inserting the head end of the catheter into the target point to be treated, energy is supplied to the electrode assembly through an energy supply platform, and the electrode assembly is brought into contact with the target site to transfer the energy to the target site, thereby performing ablation. Among them, the commonly used energy is the pulsed electric field of irreversible electroporation. This pulsed electric field has cell selectivity, especially in the process of pulmonary vein isolation ablation, it can effectively avoid esophageal and phrenic nerve injuries. In order to form an effective ablation depth, the pulsed electric field intensity distribution area formed by the catheter should be maximized.

[0003] Flexible circuits are currently widely used in the field of electrophysiology. Their structural characteristics enable a larger electrode density to be arranged at the distal end of the catheter, thereby enabling high-density electrophysiological mapping, such as the Intellamap Orion high-resolution mapping catheter of Boston Scientific. However, when used for pulsed electric field ablation, since pulsed electric field ablation requires a high voltage, there are high requirements for the current-carrying capacity of the energy transmission medium of the catheter. The transmission medium requires a large cross-sectional area to reduce resistance and improve transmission performance. Moreover, in order to achieve the mapping function, there is a voltage withstand requirement between the transmission media of each electrode, and an insulating medium needs to be added. As a result, the proportion of the electrode design space for pulsed electric field ablation will be greater than that of ordinary mapping catheters and radiofrequency ablation catheters. Or in other words, the above two requirements will limit the pulsed ablation parameters (voltage, ablation time) of the pulsed ablation catheter, thereby reducing the ablation effect. Summary of the Invention

[0004] The present invention provides an electrode assembly, an electrophysiological catheter and an electrophysiological system to solve the problems existing in the prior art, especially to solve the problem that the transmission medium in the prior art requires a large cross-sectional area to reduce resistance and improve transmission performance.

[0005] To solve the above technical problems, based on one aspect of the present invention, the present invention provides an electrode assembly that can be disposed at the distal end of a catheter and is used for transmitting energy between a device and a predetermined site. The electrode assembly includes an electrode body, a sub-electrode assembly and an electrical transmission line disposed on the electrode body. The electrical transmission line includes a plurality of ablation lines. The sub-electrode assembly includes a plurality of first ablation electrodes and a plurality of second ablation electrodes. The ablation line includes a main transmission path, a first transmission branch and a second transmission branch. The first ablation electrode and the second ablation electrode are respectively electrically connected to the output ends of the corresponding first transmission branch and the second transmission branch. The input ends of the first transmission branch and the second transmission branch converge at the main transmission path.

[0006] Optionally, the sub-electrode assembly further includes a plurality of mapping electrodes, and the electrical transmission line further includes a plurality of mapping lines disposed on the electrode body. The mapping electrodes are in one-to-one correspondence with and electrically connected to the mapping lines.

[0007] Optionally, the mapping electrodes include a first mapping electrode and a second mapping electrode, the mapping lines include a first mapping line and a second mapping line that are insulated from each other, and the first mapping electrode and the second mapping electrode are respectively electrically connected to the first mapping line and the second mapping line.

[0008] Optionally, the width of at least one of the mapping lines is between 0.02 mm and 0.5 mm.

[0009] Optionally, at least when the mapping electrodes are used for mapping, the minimum distance between the mapping electrodes and the axis of the catheter is between 5 mm and 20 mm.

[0010] Optionally, the electrodes in the sub-electrode assembly and / or the electrical transmission line are all arranged along the extending direction of the electrode body.

[0011] Optionally, the electrodes in the sub-electrode assembly are equally spaced along the extending direction of the electrode body.

[0012] Optionally, the distance between two adjacent electrodes is less than 10 mm.

[0013] Optionally, the width of at least one of the main transmission paths is between 0.04 mm and 1 mm.

[0014] Optionally, the width of at least one of the first transmission branch and the second transmission branch is between 0.02 mm and 0.5 mm.

[0015] Optionally, the electrode body comprises a proximal portion, a folded portion and a distal portion from the proximal end to the distal end along the axial direction of the catheter, the sub-electrode assembly is arranged on at least one of the proximal portion and the distal portion, at least one of the proximal portion and the distal portion is movably connected to the catheter, and the proximal portion and the distal portion can move relatively along the catheter and fold in half at the folded portion, so that the electrode body can be converted between a contracted state and a bent state;

[0016] When the electrode body is in the contracted form, the electrode body is retracted toward the catheter along the radial direction of the catheter; when the electrode body is in the bent form, the electrode body is expanded outward along the radial direction of the catheter so that the proximal end and the distal end are folded at the folding portion to form a staggered arrangement along the transverse direction of the catheter.

[0017] Optionally, the sub-electrode assembly is disposed on both the proximal end portion and the distal end portion, the sub-electrode assembly includes a proximal terminal electrode assembly disposed at the proximal end portion and a distal terminal electrode assembly disposed at the distal end, the electrode body includes an inner side surface and an outer side surface disposed oppositely, the inner side surface is a surface of the electrode body facing the catheter, and the outer side surface is a surface of the electrode body facing away from the catheter:

[0018] The proximal terminal electrode assembly and the distal terminal electrode assembly are both located on the inner side surface; or,

[0019] The proximal terminal electrode assembly and the distal terminal electrode assembly are both located on the outer side; or,

[0020] The proximal terminal electrode assembly is located on the inner side surface, and the distal terminal electrode assembly is located on the outer side surface; or,

[0021] The proximal terminal electrode assembly is located on the outer side, and the distal terminal electrode assembly is located on the inner side.

[0022] Optionally, when the electrode body is in the bent state, the electrodes in the proximal terminal electrode assembly and the electrodes in the distal terminal electrode assembly are staggered or arranged side by side.

[0023] Optionally, the folding portion has a groove, so that when the electrode body is in the bent state, the distal terminal electrode assembly and the proximal terminal electrode assembly are located on the same plane.

[0024] Based on another aspect of the present invention, the present invention further provides an electrophysiological catheter, comprising the electrode assembly and the catheter as described above.

[0025] Optionally, the electrophysiological catheter includes a plurality of the electrode assemblies, and the plurality of the electrode assemblies are arranged along the circumference of the catheter.

[0026] Optionally, the electrode assembly at least includes an adjacent first electrode assembly and a second electrode assembly, and the first electrode assembly at least includes an electrode with a polarity opposite to at least a part of the electrodes of the second electrode assembly.

[0027] Based on another aspect of the present invention, the present invention further provides an electrophysiological system, including the electrophysiological catheter as described above.

[0028] Optionally, the electrophysiological system further includes an energy source and a control unit. The mapping electrodes of the electrophysiological catheter are used to detect the position information of the electrode assembly of the electrophysiological catheter and transmit the position information to the control unit. The control unit determines whether the electrode assembly is in a predetermined position according to the position information. If the electrode assembly is in the predetermined position, the control unit controls the energy source to transmit energy to the electrode assembly.

[0029] In summary, the present invention provides an electrode assembly, an electrophysiological catheter and an electrophysiological system, which at least have one of the following beneficial effects:

[0030] 1) By arranging the transmission branches of different ablation electrodes in parallel, it has a larger cross-sectional area, so that the resistance of the energy transmission line can be reduced, the current-carrying capacity of the energy transmission line can be improved, and at the same time, the ablation boundary of the catheter is improved and the ablation depth is increased;

[0031] 2) Under the same current design requirements, the line merging can reduce the line width requirements, which is beneficial to the miniaturization of the electrophysiological catheter and improves the surgical operation space;

[0032] 3) By separately arranging the electrical transmission line with mapping function, the independence of electrophysiological mapping is ensured, the electrocardiogram signal can be collected, and at the same time, the function of tissue ablation can also be realized. In other words, under the same design space occupation ratio, the ablation ability of the electrophysiological catheter is improved. Description of the Drawings

[0033] Those of ordinary skill in the art should understand that the provided drawings are used to better understand the present invention and do not constitute any limitation to the scope of the present invention.

[0034] Figure 1 It is a schematic diagram of the circuit layout of the electrode assembly provided by the embodiment of the present invention.

[0035] Figure 2 It is a schematic diagram of the structure of the electrode assembly provided by the embodiment of the present invention.

[0036] Figure 3 It is a schematic diagram of the electrode assembly in a contracted state provided by the embodiment of the present invention.

[0037] Figure 4 This is a schematic diagram of an electrode assembly provided by an embodiment of the present invention when in a bent state.

[0038] Figure 5 is Figure 4 a top view of.

[0039] Figure 6 This is a schematic diagram of another electrode assembly provided by an embodiment of the present invention when in a bent state.

[0040] Figure 7 This is a schematic diagram of the electrode assembly provided by an embodiment of the present invention when in an intermediate state.

[0041] In the drawings:

[0042] 100 - Electrode assembly; 110 - Electrode main body; 111 - Proximal end portion; 112 - Folding portion; 113 - Distal end portion; 120 - Electrode; 121 - First ablation electrode; 122 - Second ablation electrode; 123 - Mapping electrode; 130 - Mapping line; 140 - Main transmission path; 141 - First transmission branch; 142 - Second transmission branch; 150 - Proximal mounting portion; 160 - Distal mounting portion; 200 - Catheter; 210 - Outer tube; 220 - Inner tube. Detailed implementation manners

[0043] To make the objectives, advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clearly assist in explaining the objectives of the embodiments of the present invention. In addition, the structures shown in the accompanying drawings are often a part of the actual structures. In particular, the accompanying drawings need to show different emphases, and sometimes different scales are used.

[0044] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in the sense of including "and / or", the term "several" is generally used in the sense of including "at least one", the term "at least two" is generally used in the sense of including "two or more", in addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or at least two of such features, unless the content clearly indicates otherwise.

[0045] As used herein, the definitions of "proximal end" and "distal end" are as follows: "Proximal end" generally refers to the end of the medical device that is closer to the operator during normal operation, while "distal end" generally refers to the end of the medical device that first enters the patient's body during normal operation.

[0046] The present invention provides an electrode assembly, an electrophysiological catheter, and an electrophysiological system. By arranging the transmission branches of different ablation electrodes in parallel, the resistance value of the ablation circuit is reduced, the current-carrying capacity of the ablation circuit is improved, and at the same time, the ablation boundary of the catheter is improved, and the ablation depth is increased. In addition, under the same current design requirements, the line merging can reduce the line width requirements, which is beneficial to the miniaturization of the ablation catheter and improves the surgical operation space.

[0047] The following will be described with reference to the accompanying drawings.

[0048] As Figures 1 - 3 shown, Figure 1 is a schematic diagram of the circuit layout of the electrode assembly provided by an embodiment of the present invention, Figure 2 is a schematic structural diagram of the electrode assembly provided by an embodiment of the present invention, Figure 3 is a schematic diagram of the electrode assembly in a contracted state provided by an embodiment of the present invention. The present embodiment provides an electrode assembly 100 that can be disposed at the distal end of a catheter 200 and is used to transmit energy between the device and a predetermined site. The electrode assembly 100 includes an electrode body 110, a sub-electrode assembly, and an electrical transmission line disposed on the electrode body 110. The electrical transmission line includes a plurality of ablation circuits. The sub-electrode assembly includes a plurality of first ablation electrodes 121 and a plurality of second ablation electrodes 122. The ablation circuit includes a transmission main path 140, a first transmission branch 141, and a second transmission branch 142. The first ablation electrode 121 and the second ablation electrode 122 are respectively electrically connected to the output ends of the corresponding first transmission branch 141 and the second transmission branch 142. The input ends of the first transmission branch 141 and the second transmission branch 142 meet at the transmission main path 140. Preferably, the ablation circuit is electrically connected to the control unit of the electrophysiological system through an electrical contact.

[0049] It should be understood that the number of electrodes in the accompanying Figure 1 figures provided in this embodiment is significantly less than the number of electrodes in the accompanying Figure 2 figures. Therefore, the accompanying Figure 1 figures and the accompanying Figure 2 figures are not schematic diagrams of the circuit layout and structural diagrams of the same electrode assembly. The main purpose is to more clearly illustrate the technical concept of the present invention. When the number of electrodes increases, the number of electrical transmission lines in the accompanying Figure 1 figures will also increase accordingly.

[0050] Specifically, the electrode body 110 is a flexible circuit board, and the sub-electrode assembly and the ablation circuit are both disposed on the flexible circuit board. Preferably, the electrode body 110 is made of an insulating material, such as liquid crystal copolymer (LCP), polyimide (PI), or polydimethylsiloxane (PDMS); more preferably, the electrode body 110 is filled with an elastic nickel alloy, which can improve the supporting force of the electrode body 110. The properties of the nickel-titanium alloy are not specifically described herein, and those skilled in the art can obtain them as common knowledge. It should be noted that the material used to fill and improve the supporting force of the electrode body 110 in this embodiment is not limited to the nickel-titanium alloy, and any material that can improve the supporting force of the electrode body 110 and has no side effects on patients can be filled into the electrode body 110 described in this embodiment.

[0051] The first ablation electrode 121 and the second ablation electrode 122 are used to transmit energy to a predetermined site (tissue) to achieve the ablation purpose. The first ablation electrode 121 and the second ablation electrode 122 can be made of platinum or gold. It should be understood that the "first ablation electrode" and "second ablation electrode" mentioned in this application should not be construed as limiting the type of ablation electrode, nor the number of ablation electrodes, but rather to more clearly elaborate on the technical concept of combining the transmission lines of different ablation electrodes of the present invention. In other words, the sub-electrode assembly may further include a third ablation electrode, a fourth ablation electrode, or even more ablation electrodes, all of which fall within the protection scope of the present invention. In the following description, the first ablation electrode 121 and the second ablation electrode 122 are collectively referred to as ablation electrodes.

[0052] Preferably, for an ablation site with a relatively small area at the pulmonary vein ostium, an ablation electrode with a relatively large radial dimension can be provided for ablation treatment, which can save materials. The present invention does not specifically limit the shape of the ablation electrode (which can be understood as the cross-section of the ablation electrode), and it can be circular, elliptical, polygonal, irregular planar, etc.; the radial dimension here can be understood as the maximum radial dimension, that is, the maximum distance between the edges of the ablation electrode. When the cross-section of the ablation electrode is circular, the radial dimension is the diameter.

[0053] It should be noted that the ablation electrode here can be an annular electrode sleeved on the electrode body 110, or a sheet shape protruding from the surface of the electrode body 110. The ablation electrode is preferably in the shape of a sheet, generally in the shape of a hat or a screw-like shape, and is embedded in the electrode body 110, which can make the ablation electrode abut against a predetermined site, and has a larger contact area compared to the annular electrode. With such a configuration, it is possible to avoid the electrode body 110 from abutting against the predetermined site, reduce the compressive stress on the predetermined site (pulmonary vein), and thus enable the blood in the pulmonary vein to flow normally, reducing the impact of the thermal effect on the ablation treatment.

[0054] Preferably, the ablation electrode has a flange, and no specific limitation is imposed on the extending direction of the flange. Preferably, the flange extends along the direction of the transmission line. The flange is covered by a covering layer on the transmission branch to limit the position of the ablation electrode on the transmission branch, strengthen the fixation of the ablation electrode, prevent it from falling off, and improve safety. Optionally, the covering layer can be made of polyimide or LCP (liquid crystal polymer). Alternatively, the covering layer can also be a cured glue, and the glue only covers the flange to bond with the electrode body 110.

[0055] Please continue to refer to Figure 1 , the ablation line includes a main transmission path 140, a first transmission branch 141 and a second transmission branch 142. The first ablation electrode 121 and the second ablation electrode 122 are respectively electrically connected to the output end of the first transmission branch 141 and the output end of the second transmission branch 142. The input end of the first transmission branch 141 and the input end of the second transmission branch 142 meet at the main transmission path 140. That is to say. In this embodiment, the first transmission branch 141 and the second transmission branch 142 converge on an ablation main path and are electrically connected to the control unit of the electrophysiological system, so as to control the energy source to transmit energy to the sub-electrode assembly or receive signals fed back from the sub-electrode assembly through the control unit. By performing a merging process on multiple transmission lines electrically connected to different ablation electrodes, compared with conventional energy transmission lines, it has a larger cross-sectional area, thereby being able to reduce the resistance value of the energy transmission line, improve the current-carrying capacity of the energy transmission line, and enhance the ablation effect; it is also beneficial to the miniaturization of the ablation catheter 200 and improves the surgical operation space.

[0056] It should be understood that the present application does not limit the number of the ablation lines. Preferably, considering that more ablation lines will necessarily result in a larger electrode body 110, which is not conducive to the miniaturization of the ablation catheter 200, the number of the ablation lines is not more than six, and each ablation line is independent of each other. And when the ablation lines are respectively arranged on the inner and outer sides of the electrode body 110 opposite to each other, the number of ablation lines on the same side is not more than three.

[0057] Preferably, the width of at least one of the main transmission paths is between 0.04 mm and 1 mm. In theory, the width of the circuit should be set as large as possible to meet the current capacity requirements for ablation. However, since the catheter needs to enter the human body through blood vessels, the circuit design should be as small as possible to reduce the design volume of the circuit layer. By designing some or at least one of the main transmission paths within the range of 0.04 mm to 1 mm, both the ablation current requirements can be met and the design space can be saved. Of course, the width of the main transmission path can also be less than 0.04 mm or greater than 1 mm, and this application does not limit it. The width of at least one of the first transmission branches and the second transmission branches is between 0.02 mm and 0.5 mm. In theory, the width of the circuit should be set as large as possible to meet the current capacity requirements for ablation. However, since the catheter needs to enter the human body through blood vessels, the circuit design should be as small as possible to reduce the design volume of the circuit layer. By designing some or at least one of the transmission branches within the range of 0.02 mm to 0.5 mm, both the ablation current requirements can be met and the design space can be saved. Of course, the width of the first transmission branch and the second transmission branch can also be less than 0.02 mm or greater than 0.5 mm, and this application does not limit it either.

[0058] Furthermore, the number of transmission branches on each ablation circuit can be more than two. It should be noted that each transmission branch corresponds to an ablation electrode, and the polarities of all ablation electrodes on the same ablation circuit should be the same. For example, please refer to Figure 1 , the polarities of the first ablation electrode 121 and the second ablation electrode 122 are the same. The polarities of the ablation electrodes on different ablation circuits can be the same or different, and this application does not impose any restrictions on this.

[0059] Please continue to refer to Figure 1, the sub - electrode assembly further includes a plurality of mapping electrodes 123, the electrical transmission line further includes a plurality of mapping lines 130 arranged on the electrode body 110. The mapping electrodes 123 and the mapping lines 130 are in one - to - one correspondence and electrically connected, and at least one of the mapping lines 130 is insulated from the ablation line. The mapping electrodes 123 are used to detect the position information of the electrode assembly 100 of the electrophysiological catheter and transmit the position information to the control unit. The control unit determines whether the electrode assembly is in a predetermined position according to the position information. If the electrode assembly is in the predetermined position, the control unit controls the energy source to transmit energy to the sub - electrode assembly to ablate the predetermined position. At the same time, the mapping electrodes 123 can also be used for tissue ablation. By separately arranging the mapping lines 130 that need to have the mapping function and the ablation line, the independence of electrophysiological mapping is ensured. It can not only collect electrocardiogram signals but also realize the function of tissue ablation. In other words, under the same design space occupancy ratio, the ablation ability of the catheter is improved.

[0060] In this embodiment, there are two mapping electrodes 123. The two mapping electrodes 123 are respectively a first mapping electrode and a second mapping electrode. The mapping lines 130 include a first mapping line and a second mapping line that are insulated from each other. The first mapping electrode and the second mapping electrode are respectively electrically connected to the first mapping line and the second mapping line. The two mapping lines 130 are independent of each other and are respectively electrically connected to the control unit of the electrophysiological system to obtain a wider range of position information. For the limitation of the shape and size of the mapping electrodes, please refer to the above description of the ablation electrodes and will not be elaborated here one by one.

[0061] Preferably, at least when the mapping electrodes 123 are used for mapping, the minimum distance between the mapping electrodes 123 and the axis of the catheter is between 5 mm and 20 mm, which can improve the degree of contact between the mapping electrodes 123 and the tissue and improve the reliability of mapping. Of course, it can be understood that when the electrode carrier 110 is in a contracted state or other intermediate states, the minimum distance between the mapping electrodes 123 and the axis of the catheter 220 can also be between 5 mm and 20 mm, or can be greater than 20 mm or less than 5 mm, and the present application does not make any restrictions on this.

[0062] Please continue to refer to Figure 2, the electrode 120 in the sub - electrode assembly and / or the electrical transmission line are both arranged along the extension direction of the electrode body 110, so as to reduce the occupied space of the sub - electrode assembly and the electrical transmission line, which is conducive to the miniaturization of the electrode body 110. That is to say, the shape of the electrode body 110 determines the arrangement mode of the electrode 120 in the sub - electrode assembly. For example, the shape of the electrode body 110 can be linear, broken - line type or curved type, and the present application does not impose any restrictions on this.

[0063] Preferably, the electrodes 120 in the sub - electrode assembly are equally spaced along the extension direction of the electrode body 110, so as to better ablate the predetermined part. It should be noted that the electrode 120 mentioned in the sub - electrode assembly in this article can refer to the first ablation electrode 121 and the second ablation electrode 122, or can also refer to the mapping electrode 123.

[0064] Preferably, the distance between two adjacent electrodes is less than 10 mm. The two adjacent electrodes can be two of the first ablation electrodes, two of the second ablation electrodes, two of the mapping electrodes, or any combination of the first ablation electrode, the second ablation electrode and the mapping electrode 123.

[0065] In this embodiment, the electrical transmission line includes an ablation line and the mapping line 130, and both the ablation line and the mapping line 130 are arranged along the extension direction of the electrode body 110. In other words, the running directions of the ablation line and the mapping line 130 are roughly the same as the shape of the electrode body 110, so as to minimize the space occupied by the ablation line and the mapping line 130, which is conducive to the miniaturization of the ablation catheter 200.

[0066] Furthermore, the number of the mapping lines 130 is not more than six, and the mapping lines 130 are independent of each other. And when the mapping lines 130 are respectively arranged on the opposite inner and outer sides of the electrode body 110, the number of the mapping lines 130 on the same side is not more than three. In this embodiment, the number of the mapping lines 130 is two, each mapping line 130 corresponds to a mapping electrode 123, the two mapping lines 130 are independent of each other, and are respectively electrically connected to the control unit of the electrophysiological system, ensuring the independence of electrophysiological mapping, capable of collecting electrocardiogram signals, and at the same time, the function of tissue ablation can also be realized.

[0067] Of course, when ablating different parts, the requirements for the number of the ablation line and the mapping line 130 are also different. For example, for the electrode assembly 100 used for ablating the pulmonary vein, the number of the ablation line and the mapping line 130 on the same side is not more than two.

[0068] Preferably, the width of at least one of the mapping circuits 130 is between 0.02 mm and 0.5 mm. In theory, the width of the circuit should be set as large as possible to meet the current capacity requirements of ablation. However, since the catheter needs to enter the human body through the blood vessels, the circuit is designed to be as small as possible to reduce the design volume of the circuit layer. By designing some or at least one of the mapping circuits 130 within the range of 0.02 mm to 0.5 mm, the current requirements of mapping ablation can be met and the design space can be saved. Of course, the width of the mapping circuit 130 can also be less than 0.02 mm or greater than 0.5 mm, and the present application does not impose any restrictions on this.

[0069] Preferably, the spacing between the electrical transmission lines of two adjacent electrodes 120 in the sub-electrode assembly is between 0.02 mm and 0.5 mm. The electrical transmission lines here correspond to the electrical transmission lines of each of the electrodes 120, for example, the ablation electrode corresponds to the ablation line, and the mapping electrode 123 corresponds to the mapping line 130. Preferably, when the predetermined part is the pulmonary vein, the spacing between the electrical transmission lines of two adjacent electrodes 120 in the sub-electrode assembly is between 0.05 mm and 0.2 mm.

[0070] Please refer to Figures 2 - 4 , Figure 2 1 is a schematic diagram of the structure of the electrode assembly provided by an embodiment of the present invention. The electrode body 110 includes a proximal portion 111, a folded portion 112 and a distal portion 113 extending from the proximal end to the distal end along the axial direction of the catheter 200, the sub-electrode assembly is disposed on at least one of the proximal portion 111 and the distal portion 113, at least one of the proximal portion 111 and the distal portion 113 is movably connected to the catheter 200, the proximal portion 111 and the distal portion 113 can move relative to each other along the catheter 200 and fold in half at the folded portion 112, so that the electrode body 110 can be converted between a contracted form and a bent form;

[0071] When the electrode body 110 is in the contracted state, the electrode body 110 is retracted toward the catheter 200 along the radial direction of the catheter 200;

[0072] When the electrode body 110 is in the bent state, the electrode body 110 expands radially outwardly along the catheter 200 so that the proximal portion 111 and the distal portion 113 are folded at the folding portion 112 to form a staggered arrangement along the transverse direction of the catheter 200 .

[0073] Please continue to refer to Figure 3 , Figure 3It is a schematic diagram of the electrode assembly provided by an embodiment of the present invention in a contracted form. When the electrode body 110 is in the contracted form, the electrode body 110 is inwards abutted against the catheter 200 along the radial direction of the catheter 200 (abutted against the outer wall of the catheter 200); please refer to Figure 4 , Figure 4 It is a schematic diagram of an electrode assembly provided by an embodiment of the present invention in a bent form. When the electrode body 110 is in the bent form, the electrode body 110 expands outwards along the radial direction of the catheter 200, so that the proximal end 111 and the distal end 113 are folded in half at the folding part 112, forming a staggered arrangement along the transverse direction of the catheter 200. It should be understood that when the relative movement occurs between the proximal end 111 and the distal end 113, the ends of the proximal end 111 and the distal end 113 facing each other move outwards along the radial direction of the catheter 200, so that the proximal end 111 and the distal end 113 are respectively arranged at an angle with the axial direction of the catheter 200; the bent form here refers to the maximum bent form, that is, the proximal end 111 and the distal end 113 are substantially abutted against each other (if there is a little gap between them, it can be ignored); the proximal end 111 and the distal end 113 are inclined towards each other, which means that they are respectively inclined towards each other; more specifically, along the transverse direction of the catheter 200, the proximal end 111 and the distal end 113 are arranged at an angle; along the axial direction of the catheter 200, the proximal end 111 and the distal end 113 do not coincide. In this way, both the proximal end 111 and the distal end 113 are abutted against the predetermined part, increasing the contact area; the transverse direction of the catheter 200 refers to the direction substantially along the cross-section of the catheter 200, and the axial direction of the catheter 200 should be understood as the direction substantially along the extension direction of the catheter 200 (including the case of bending or broken line).

[0074] In the prior art, the structure for ablation (the structure is generally similar to the electrode assembly 100 in this embodiment and is generally linear. Hereinafter, the structure for ablation in the prior art is named as the ablation electrode assembly) is formed by arranging a plurality of ring electrodes in sequence on a polymer tube. After the ablation electrode assembly is pushed through the catheter, the distal end of the catheter is twisted, so as to realize the twisting of the ablation electrode assembly to form a staggered arrangement in the ablation electrode assembly. In the prior art, the traditional polymer tube / ring electrode occupies a large space, resulting in limited density of the ablation electrode assembly. In addition, the anti-torsion performance of the twisted ablation electrode assembly is poor, and it is impossible to maximize the area where the ablation electrode assembly abuts against the predetermined part, which affects both the ablation depth and the accuracy of the high-density mapping of the ablation electrode assembly.

[0075] In this embodiment, please refer to Figure 4The electrode body 110 further includes a folding portion 112. The folding portion 112 is respectively connected to the proximal end portion 111 and the distal end portion 113. By relatively moving the proximal end portion 111 and the distal end portion 113 along the catheter 200 and folding at the folding portion 112, finally, the proximal end portion 111 and the distal end portion 113 are arranged in a folded and staggered manner, avoiding the influence of the torsion of the electrode assembly on the contact area between the electrode body 110 and the predetermined part, thereby improving the electric field around the predetermined part and enhancing the ablation effect.

[0076] In addition, please refer to Figure 6 , Figure 6 which is a schematic diagram of another electrode assembly provided by an embodiment of the present invention in a bent state. The electrode assembly 100 is in an unfolded three-dimensional state and can also be used for ablation. It should be understood that Figure 6 the corresponding electrode assembly 100 does not include the folding portion 112.

[0077] Preferably, the folding portion 112 can be made of an insulating material.

[0078] Preferably, the folding portion 112 has a groove. When the electrode body 110 is in the bent state, the groove is used to accommodate the proximal end portion 111 or the distal end portion 113. In this way, when the electrode body 110 is in the bent state, the proximal end portion 111 and the distal end portion 113 are substantially on the same plane (curved surface), which is convenient for contacting with the predetermined part.

[0079] Preferably, please continue to refer to Figure 2 , and in combination with Figure 3 and Figure 4 , at least one of the proximal end portion 111 and the distal end portion 113 is arc-shaped or zigzag-shaped. With such a setting, when the electrode body 110 is in the bent state, the overlapping part of the proximal end portion 111 and the distal end portion 113 can be reduced, and the arrangement mode of the two can be optimized. Preferably, both the proximal end portion 111 and the distal end portion 113 are arc-shaped or zigzag-shaped, and the opening directions of the proximal end portion 111 and the distal end portion 113 are opposite to each other in the transverse direction of the catheter 200. With such a configuration, when the electrode body 110 is in the contracted state, the electrode body 110 is substantially in an "S" shape. When in the bent state, the lower part of the "S" is folded up to abut against the upper part, so that the electrode body 110 is substantially in a petal shape. It should be understood that the zigzag shape here means that several broken line segments are sequentially connected along the axial direction of the catheter 200, and the connection angle between adjacent two broken line segments is relatively small and can be ignored (for example, 5°). After several broken line segments are sequentially connected, it can be generally understood as being arc-shaped as a whole.

[0080] The electrodes 120 in multiple of the sub - electrode assemblies are arranged at intervals along the extending direction of the proximal end portion 111, and / or the electrodes in multiple of the sub - electrode assemblies are arranged at intervals along the extending direction of the distal end portion 113. By adjusting the number of the electrodes 120 in the sub - electrode assemblies to change the density of the electrodes and appropriately setting the mapping electrodes 123, the high - density mapping function of the electrode assembly 100 can be realized to assist in collecting physiological signals at a predetermined site.

[0081] In this embodiment, the sub - electrode assemblies are provided on both the proximal end portion 111 and the distal end portion 113 to increase the ablation depth and improve the accuracy of high - density mapping. The sub - electrode assembly includes a proximal sub - electrode assembly provided on the proximal end portion 111 and a distal sub - electrode assembly provided on the distal end. The proximal sub - electrode assembly and the distal sub - electrode assembly are located on two opposite side surfaces of the electrode body 110, so that when the electrode body 110 is in the bent form, both the proximal sub - electrode assembly and the distal sub - electrode assembly face the distal end of the catheter 200.

[0082] Preferably, the electrode body 110 is strip - shaped, similar to a planar shape (analogous to a rectangle). The sub - electrode assembly located at the proximal end portion 111 and the sub - electrode assembly located at the distal end portion 113 are distributed on two sides of the electrode body 110. In an exemplary embodiment, when the electrode body 110 is in the contracted form, the electrode body 110 is perpendicular to the radial direction of the catheter 200. The sub - electrode assembly located at the proximal end portion 111 is distributed on the inner side surface of the electrode body 110, and the sub - electrode assembly located at the distal end portion 113 is distributed on the outer side surface of the electrode body 110. When the electrode body 110 is in the bent form, the electrodes 120 in the sub - electrode assembly all face the distal end; or the sub - electrode assembly located at the proximal end portion 111 is distributed on the outer side surface of the electrode body 110, and the sub - electrode assembly located at the distal end portion 113 is distributed on the inner side surface of the electrode body 110. When the electrode body 110 is in the bent form, the electrodes 120 of the sub - electrode assembly all face the proximal end. Here, the inner side surface of the electrode body 110 refers to the side of the electrode body 110 close to the catheter 200; the outer side surface of the electrode body 110 refers to the side of the electrode body 110 facing away from the catheter 200. Those skilled in the art can configure the distribution of the sub - electrode assembly on the outer side surface or the inner side surface of the electrode body 110 according to the actual configuration of the predetermined site by the pathologist.

[0083] In some other embodiments, in the contracted configuration, it is not limited that the electrode body 110 is perpendicular to the radial direction of the catheter 200. The electrode body 110 can also be arranged at an angle to the catheter 200 (including 0°, that is, the electrode body 110 extends along the radial direction of the catheter 200). When in the bent configuration, it is only required that the two sides of the electrode body 110 face the proximal end and the distal end respectively.

[0084] Furthermore, when the electrode body 110 is in the bent configuration, the electrodes 120 in the proximal sub-electrode assembly and the electrodes 120 in the distal sub-electrode assembly are arranged in a staggered manner or side by side, so as to increase the area of the electrode assembly 100 for ablation, and also to make the energy distribution of ablation concentrated.

[0085] Furthermore, in the sub-electrode assembly, the radial dimensions of at least some of the electrodes 120 are not uniform. It can also be understood that the cross-sectional areas of at least some of the electrodes 120 are not the same. The radial dimension of the electrode 120 located in the middle of the proximal end portion 111 is larger than the radial dimensions of the electrodes 120 facing the two ends of the proximal end portion 111, and / or the radial dimension of the electrode 120 located in the middle of the distal end portion 113 is larger than the radial dimensions of the electrodes 120 facing the two ends of the distal end portion 113. Specifically, please refer to Figure 3 and Figure 4 , taking the proximal end portion 111 and the distal end portion 113 being arc-shaped as an example, the radial dimension of the electrode 120 located in the middle part of the proximal end portion 111 / the distal end portion 113 is larger, and then towards the two ends of the proximal end portion 111 / the distal end portion 113, the radial dimension of the electrode 120 gradually decreases. Since the distance between the middle parts of the proximal end portion 111 and the distal end portion 113 is larger when the electrode body 110 is in the bent configuration, the electrodes 120 with larger radial dimensions can be arranged, and the distance between the two parts towards the two ends is smaller, and the electrodes 120 with smaller radial dimensions can be arranged. In this way, the arrangement mode of the electrodes 120 can be optimized, the redundant space can be utilized as much as possible, the area of the electrode assembly 100 for ablation can be increased, and the energy distribution of ablation can also be concentrated.

[0086] When one of the proximal end portion 111 and the distal end portion 113 is arc-shaped and the other is linear, and the electrode body 110 is in a bent state, the proximal end portion 111 and the distal end portion 113 as a whole are generally semi-elliptical (including semi-circular). When the curvature of the arc approaches that of an elliptical arc, at this time, the semi-ellipses are respectively symmetrical about their major axis or minor axis, and the radial dimensions of the electrodes 120 of the proximal end portion 111 and the distal end portion 113 can be configured to gradually decrease (decrease) from their respective middle parts to both ends; similarly, when both the proximal end portion 111 and the distal end portion 113 are arc-shaped, and the curvatures of both arcs approach that of an elliptical arc, in the bent state, the proximal end portion 111 and the distal end portion 113 as a whole present an ellipse (including a circle), and the radial dimensions of the electrodes 120 of the first section and the second section can also be configured to gradually decrease (decrease) from their respective middle parts to both ends. It should be noted that in the above-mentioned "ellipse" and "semi-ellipse", the radial dimensions of the two electrodes 120 that are opposite to each other along the minor axis of the proximal end portion 111 and the distal end portion 113 (roughly opposite, and there may be some deviations, which are all understood as opposite here) can be equal or unequal. This embodiment does not limit this. In addition, the above-mentioned "ellipse" and "semi-ellipse" are only used for illustration and do not limit the present invention in any way.

[0087] As Figure 5 shown, Figure 5 is Figure 4 a top view. When the electrode body 110 is in a bent state, the minimum distance between the mapping electrode 123 in the sub-electrode assembly and the axis of the catheter 200 is between 5 mm and 20 mm. That is, in the space defined by taking the axis of the catheter 200 as the center and R as the radius, by setting the radial distance R, the degree of contact between the mapping electrode 123 and the tissue can be improved, and the reliability of mapping can be enhanced. It should be understood that when the shape of the electrode body 110 changes, the position of the mapping electrode 123 will also change, so the minimum distance between the mapping electrode 123 and the axis of the catheter 200 will also change. However, it is necessary to ensure that at least when the mapping electrode 123 is used for mapping, the minimum distance between the mapping electrode 123 and the axis of the catheter 200 is between 5 mm and 20 mm.

[0088] Please refer to Figure 7 , Figure 7It is a schematic diagram of the electrode assembly provided by the embodiment of the present invention when it is in an intermediate form. In this embodiment, the electrode body 110 is still in an intermediate form. Specifically, the electrode body 110 is converted between the contracted form and the intermediate form, and between the intermediate form and the bent form; when the electrode body 110 is in the intermediate form, the projection of the folding part 112 on the catheter 200 (the projection on the catheter 200 along the radial direction of the catheter 200) is between the proximal end 111 and the distal end 113. It can be understood that when in the intermediate form, the cross-section of the structure formed by the electrode body 110 and the catheter 200 is generally semi-elliptical. Actually, the electrode body 110 in the intermediate form can be used to perform ablation treatment on the wall of the physiological lumen.

[0089] Optionally, when the electrode body 110 is in the contracted form and / or the intermediate form, the proximal end 111 and the distal end 113 are arranged in a transverse dislocation along the catheter 200. As described above, when the electrode body 110 is in the bent form, the proximal end 111 and the distal end 113 are arranged in a transverse dislocation along the catheter 200. In this embodiment, when the electrode body 110 is in the contracted form, the intermediate form and the bent form respectively, the arrangement of the proximal end 111 and the distal end 113 includes one of the following several situations:

[0090] (1) In the three forms of the contracted form, the intermediate form and the bent form, the proximal end 111 and the distal end 113 are both arranged in a transverse dislocation along the catheter 200. Among them, when in the contracted form, the proximal end 111 and the distal end 113 are attached to the catheter 200, and the electrode body 110 is generally in a curled shape;

[0091] (2) When the electrode body 110 is in the contracted form and the intermediate form, the proximal end 111 and the distal end 113 are not arranged in a dislocation (for example, the two can be arranged along the axis of the catheter 200), and when in the bent form, the proximal end 111 and the distal end 113 are in a dislocation;

[0092] (3) When the electrode body 110 is in one of the contracted form and the intermediate form, the proximal end 111 and the distal end 113 are in a dislocation, when in the other of the contracted form and the intermediate form, the proximal end 111 and the distal end 113 are not in a dislocation, and when in the bent form, the proximal end 111 and the distal end 113 are in a dislocation. In this embodiment, when the electrode body 110 is in the above three forms, the proximal end 111 and the distal end 113 are both arranged in a transverse dislocation along the catheter 200.

[0093] Based on the above electrode assembly 100, in combination with Figures 1 - 5, the present invention also provides an electrophysiological catheter, which includes the catheter 200 as described above and the electrode assembly 100 as described above. At least one of the proximal end portion 111 and the distal end portion 113 of the electrode body 110 of the electrode assembly 100 is movably connected to the catheter 200, and a sub-electrode assembly is provided on at least one of the proximal end portion 111 and the distal end portion 113. The proximal end portion 111 and the distal end portion 113 can move relative to the catheter 200 and fold at the folding portion 112, so that the electrode body 110 can be converted between a contracted form and a bent form.

[0094] Further, the electrophysiological catheter includes a plurality of the electrode assemblies 100, and the plurality of the electrode assemblies 100 are arranged circumferentially along the catheter 200. Preferably, the plurality of the electrode assemblies 100 are evenly arranged circumferentially along the catheter 200 to optimize the arrangement method and make the energy distribution of ablation uniform. Please refer to Figure 4 , after the electrode bodies 110 of the plurality of electrode assemblies 100 are in the bent form, the whole is generally similar to a petal and fits with the pulmonary vein orifice (the pulmonary vein orifice is generally conical) to perform ablation and collect physiological signals.

[0095] Furthermore, when the electrode body 110 of the electrode assembly 100 is in the contracted form, the sub-electrode assemblies on two adjacent electrode assemblies 100 are arranged axially offset along the catheter 200. It can be understood that for two adjacent electrode assemblies 100, when in the contracted form, the electrodes 120 on one electrode assembly 100 are arranged offset from the electrodes 120 in the other electrode assembly 100. In this way, redundant space can be saved, so that the number of electrode assemblies 100 arranged on the catheter 200 is sufficient, the ablation depth can be increased, and a wider ablation lesion can be formed.

[0096] Furthermore, the electrode assembly 100 at least includes an adjacent first electrode assembly and a second electrode assembly, and the first electrode assembly at least includes electrodes with polarities opposite to at least a part of the electrodes of the second electrode assembly.

[0097] For example, when the proximal sub-electrode assembly and the distal sub-electrode assembly on the same electrode assembly 100 discharge simultaneously, the polarities of the proximal sub-electrode assembly and the distal sub-electrode assembly are the same, and the polarities of the sub-electrode assemblies on two adjacent first electrode assemblies and second electrode assemblies are opposite;

[0098] When the distal sub-electrode assemblies on all the electrode assemblies 100 discharge simultaneously and the proximal sub-electrode assemblies do not discharge, the polarities of the distal sub-electrode assemblies on two adjacent first electrode assemblies and second electrode assemblies are opposite;

[0099] When the near-end sub-electrode assemblies on all the electrode assemblies 100 discharge simultaneously and the far-end sub-electrode assemblies do not discharge, the polarities of the near-end sub-electrode assemblies on two adjacent first electrode assemblies and second electrode assemblies are opposite.

[0100] Please continue to refer to Figure 4 , the catheter 200 includes an outer tube 210 and an inner tube 220. The inner tube 220 is movably disposed through the outer tube 210 (it can be understood that the catheter 200 has flexibility), and the inner tube 220 extends out of the outer tube 210 towards the distal end. At least one of the proximal end portion 111 and the distal end portion 113 is used to be movably connected to the catheter 200. The relative movement of the proximal end portion 111 and the distal end portion 113 along the catheter 200 (the relative distance changes), specifically includes one of the following several situations:

[0101] (1) The proximal end portion 111 and the distal end portion 113 are both movably disposed on the outer tube 210 or the inner tube 220. By changing the relative distance after the movement of the proximal end portion 111 and the distal end portion 113, the morphological change of the electrode body 110 is realized;

[0102] (2) One of the proximal end portion 111 and the distal end portion 113 is fixed on the catheter 200, and the other is movably disposed on the catheter 200. For example, one of the proximal end portion 111 and the distal end portion 113 is fixed on the inner tube 220, and the other is movably disposed on the inner tube 220. Or, one of the proximal end portion 111 and the distal end portion 113 is fixed on the outer tube 210, and the other is movably disposed on the outer tube 210;

[0103] (3) Lock the positions of the outer tube 210 and the inner tube 220 to prevent relative sliding therebetween. The proximal end portion 111 is movably disposed on the outer tube 210, and / or the distal end portion 113 is movably disposed on the inner tube 220, and the morphological change of the electrode body 110 can also be realized;

[0104] (4) The proximal end portion 111 is fixed on the outer tube 210, and the distal end portion 113 is fixed on the inner tube 220. By the movement of the inner tube 220 through the outer tube 210 (the inner tube 220 is pushed towards the distal end and the inner tube 220 is retracted towards the proximal end), the relative movement between the proximal end portion 111 and the distal end portion 113 is realized.

[0105] In the above (1), (2), and (3), a traction wire can be connected to the proximal end portion 111 and / or the distal end portion 113 respectively to guide their relative movement.

[0106] In this embodiment, please continue to refer to Figure 2 and Figure 7, the electrophysiological catheter further includes a proximal mounting portion 150 and a distal mounting portion 160. The proximal end portion 111 of the electrode assembly 100 is mounted on the outer tube 210 through the proximal mounting portion 150, and the distal end portion 113 of the electrode assembly 100 is mounted on the inner tube 220 through the distal mounting portion 160. In the contracted state, the proximal mounting portion 150 and the distal mounting portion 160 are arranged substantially collinearly or nearly collinearly, which is convenient for technicians to install. Preferably, the centers of the proximal mounting portion 150, the distal mounting portion 160, and the folding portion 112 are located on the same axis (i.e., arranged along the axis of the catheter 200), and the proximal end portion 111 and the distal end portion 113 are respectively located on both sides of this axis.

[0107] Based on the above electrophysiological catheter, this embodiment further provides an electrophysiological system, and the electrophysiological system includes the electrophysiological catheter as described above. It should be understood that since the electrophysiological system includes the electrophysiological catheter, the electrophysiological system also has the beneficial effects brought by the electrophysiological catheter. The working principle and other components of the electrophysiological system are not elaborated in detail here.

[0108] Furthermore, the electrophysiological system further includes an energy source and a control unit. The mapping electrodes of the electrophysiological catheter are used to detect the position information of the electrode assembly of the electrophysiological catheter and transmit the position information to the control unit. The control unit determines whether the electrode assembly is in a predetermined position according to the position information. If the electrode assembly is in the predetermined position, the control unit controls the energy source to transmit energy to the sub-electrode assembly of the electrode assembly. Among them, the determination of the position information can be determined by the different electrical activity signal characteristics of each part of the heart, such as pulmonary vein signals. The electrical signals at the location are collected through the mapping lines on the catheter, and it is judged whether the predetermined treatment site is reached through the unique electrical signal characteristics of different parts. In this embodiment, the control unit is, for example, a PLC, and the present application does not make any restrictions on this.

[0109] In summary, the embodiments of the present invention provide an electrode assembly, an electrophysiological catheter, and an electrophysiological system. The electrode assembly can be disposed at the distal end of a catheter and is used to transmit energy between a device and a predetermined site. The electrode assembly includes an electrode body, a sub-electrode assembly, and an electrical transmission line disposed on the electrode body. The electrical transmission line includes a plurality of ablation lines. The sub-electrode assembly includes a plurality of first ablation electrodes and a plurality of second ablation electrodes. The ablation line includes a main transmission path, a first transmission branch, and a second transmission branch. The first ablation electrode and the second ablation electrode are respectively electrically connected to the output ends of the corresponding first transmission branch and the second transmission branch. The input ends of the first transmission branch and the second transmission branch converge at the main transmission path. By setting the transmission branches of different ablation electrodes in parallel, the resistance value of the ablation line is reduced, the current-carrying capacity of the ablation line is improved, and at the same time, the ablation boundary of the catheter is improved and the ablation depth is increased.

[0110] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention according to the above disclosure are within the scope of protection of the claims.

Claims

1. An electrode assembly that can be disposed at the distal end of a catheter and is used for transmitting energy between a device and a predetermined site. Characterized in that: The electrode assembly includes an electrode body, a sub-electrode assembly and an electrical transmission line arranged on the electrode body. The electrical transmission line includes a plurality of ablation lines. The sub-electrode assembly includes a plurality of first ablation electrodes and a plurality of second ablation electrodes. The ablation line includes a main transmission path, a first transmission branch and a second transmission branch. The first ablation electrode and the second ablation electrode are respectively electrically connected to the output ends of the corresponding first transmission branch and the second transmission branch. The input ends of the first transmission branch and the second transmission branch converge at the main transmission path. The electrode body includes a proximal end portion, a folding portion and a distal end portion along the axial direction of the catheter from the proximal end to the distal end. The sub-electrode assembly is provided on at least one of the proximal end portion and the distal end portion. At least one of the proximal end portion and the distal end portion is movably connected to the catheter. The proximal end portion and the distal end portion can move relative to the catheter and fold at the folding portion, so that the electrode body can be converted between a contracted form and a bent form. When the electrode body is in the contracted form, the electrode body converges towards the catheter along the radial direction of the catheter. When the electrode body is in the bent form, the electrode body expands outward along the radial direction of the catheter, so that the proximal end portion and the distal end portion are folded at the folding portion, forming a staggered arrangement along the transverse direction of the catheter. The folding portion has a groove for accommodating the proximal end portion or the distal end portion, so that when the electrode body is in the bent form, the proximal end portion and the distal end portion are on the same plane.

2. The electrode assembly according to claim 1. Characterized in that: The sub-electrode assembly further includes a plurality of mapping electrodes. The electrical transmission line further includes a plurality of mapping lines arranged on the electrode body. The mapping electrodes are in one-to-one correspondence with and electrically connected to the mapping lines.

3. The electrode assembly according to claim 2. Characterized in that: The mapping electrodes include a first mapping electrode and a second mapping electrode. The mapping lines include a first mapping line and a second mapping line that are insulated from each other. The first mapping electrode and the second mapping electrode are respectively electrically connected to the first mapping line and the second mapping line.

4. The electrode assembly according to claim 2. Characterized in that: The width of at least one of the mapping lines is between 0.02 mm and 0.5 mm.

5. The electrode assembly according to claim 2. Characterized in that: At least when the mapping electrodes are used for mapping, the minimum distance between the mapping electrodes and the axis of the catheter is between 5 mm and 20 mm.

6. The electrode assembly according to any one of claims 1-5. Characterized in that: The electrodes in the sub-electrode assembly and / or the electrical transmission line are all arranged along the extending direction of the electrode body.

7. The electrode assembly according to claim 6. Characterized in that: The electrodes in the sub-electrode assembly are equally spaced along the extending direction of the electrode body.

8. The electrode assembly according to claim 7, It is characterized in that The distance between two adjacent electrodes is less than 10 mm.

9. The electrode assembly according to claim 1, It is characterized in that The width of at least one of the main transmission paths is between 0.04 mm and 1 mm.

10. The electrode assembly according to claim 1 or 9, It is characterized in that A width of at least one of the first transmission branch and the second transmission branch is between 0.02 mm and 0.5 mm.

11. The electrode assembly according to claim 1, It is characterized in that The sub-electrode assembly is disposed on both the proximal end portion and the distal end portion, and the sub-electrode assembly includes a proximal terminal electrode assembly disposed at the proximal end portion and a distal terminal electrode assembly disposed at the distal end, and the electrode body includes an inner side surface and an outer side surface disposed oppositely, the inner side surface is a surface of the electrode body facing the catheter, and the outer side surface is a surface of the electrode body facing away from the catheter: The proximal terminal electrode assembly and the distal terminal electrode assembly are both located on the inner side surface; or, The proximal terminal electrode assembly and the distal terminal electrode assembly are both located on the outer side; or, The proximal terminal electrode assembly is located on the inner side surface, and the distal terminal electrode assembly is located on the outer side surface; or, The proximal terminal electrode assembly is located on the outer side, and the distal terminal electrode assembly is located on the inner side.

12. The electrode assembly according to claim 11, It is characterized in that When the electrode body is in the bent state, the electrodes in the proximal terminal electrode assembly and the electrodes in the distal terminal electrode assembly are staggered or arranged side by side.

13. An electrophysiological catheter, It is characterized in that It comprises the electrode assembly and the catheter as described in any one of claims 1-12.

14. The electrophysiological catheter according to claim 13, It is characterized in that The electrophysiological catheter includes a plurality of electrode assemblies, and the plurality of electrode assemblies are arranged along the circumference of the catheter.

15. The electrophysiological catheter according to claim 14, It is characterized in that The electrode assembly includes at least a first electrode assembly and a second electrode assembly that are adjacent to each other, and the first electrode assembly includes at least an electrode having a polarity opposite to that of at least a portion of electrodes of the second electrode assembly.

16. An electrophysiological system, It is characterized in that Comprising an electrophysiological catheter as claimed in any one of claims 13-15.

17. The electrophysiological system according to claim 16, It is characterized in that The electrophysiological system also includes an energy source and a control unit. The mapping electrode of the electrophysiological catheter is used to detect the position information of the electrode assembly of the electrophysiological catheter and transmit the position information to the control unit. The control unit determines whether the electrode assembly is in a predetermined position based on the position information. If the electrode assembly is in the predetermined position, the control unit controls the energy source to transmit energy to the electrode assembly.

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