High density mapping catheter

Abstract

This application provides a mapping catheter, including a handle, a catheter body, and a mapping portion. The mapping portion includes multiple mapping branches, each mapping branch including a first connecting portion and a ridge. The ridge has at least two ring electrodes along its length, which are used to contact tissue to obtain electrocardiogram signals. The ridge of each mapping branch is connected to a fixed connection portion at the distal end of the catheter body via the first connecting portion. The fixed connection portion is provided with a perfusion tube, the end of which has a metal tip. The metal tip is configured to allow contact with blood but not with tissue to obtain far-field signals. By using the metal tip of the perfusion tube as a far-field electrode, the metal tip is both part of the perfusion tube and performs the function of a far-field electrode, thereby providing more space for the perfusion system. While providing the function of a far-field electrode, it also improves the distribution of the cooling medium in the perfusion tube, improves the perfusion effect, and reduces the manufacturing cost.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a high-density mapping catheter. Background Technology

[0002] Atrial fibrillation (AF) is one of the most common cardiac arrhythmias in clinical practice and a major challenge facing the global cardiovascular field in the 21st century. Catheter ablation is currently one of the effective methods for curing AF. Mapping catheters are important tools for doctors to trace the source of the disease and develop ablation plans. Among them, high-density mapping catheters can perform signal mapping of the entire heart chambers, shortening the mapping time.

[0003] The placement of far-field electrodes can improve signal quality, enhance positioning accuracy, improve imaging, and enhance anti-interference capabilities for high-density mapping catheters, providing stronger support for the diagnosis and treatment of complex arrhythmias.

[0004] However, in the existing technology, the far-field electrode is generally set in the center of the catheter and bound to the infusion channel. This often requires the far-field electrode to occupy part of the infusion channel structure, which places high demands on the structural design of the catheter, increases the process cost, and also limits the application scenarios of high-density mapping electrodes. Secondly, it also limits the distribution of the cooling medium in the infusion system and affects the cooling effect. Summary of the Invention

[0005] The purpose of this invention is to provide a mapping catheter to solve at least one of the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, the present invention provides a high-density mapping catheter, which includes: a handle, a catheter body, and a mapping part;

[0007] The mapping section includes multiple mapping branches, each mapping branch including a first connecting part and a ridge; the ridge is provided with at least two ring electrodes in sequence along its length, the ring electrodes being used to contact the tissue to obtain electrocardiogram signals;

[0008] The ridge of each of the mapping branches is connected to the fixed connection portion at the distal end of the catheter body via the corresponding first connection portion;

[0009] The fixed connection part is provided with an injection tube, the end of which has a metal head end. The injection tube has an injection hole that communicates with the outside. The injection tube has a distal outlet pipe inside. The distal outlet pipe includes a liquid storage chamber.

[0010] The metal tip is configured to allow contact with blood but not with tissue to acquire far-field signals.

[0011] Optionally, the infusion tube includes a non-metallic tube body and a solid metal head located at the distal end of the tube body, wherein the metal head is connected to the tube body by one of the following methods: nesting, tenon and mortise, or interference fit.

[0012] Optionally, the infusion tube includes a non-metallic tube body and a metal head end, the metal head end having an inner cavity, and the inner cavity of the metal head end being part of the liquid storage cavity.

[0013] Optionally, the metal head end also has an injection hole that connects the inner cavity of the metal head end to the outside.

[0014] Optionally, the number of injection holes is 6 to 66.

[0015] Optionally, the metal head end is electrically connected to a wire, and the wire at the metal head end passes through the inner cavity of the catheter body and is electrically connected to the handle.

[0016] Optionally, the catheter body may also extend to a saline tube, and there may be multiple distal outlet tubes, which are connected and converged by a transverse connecting tube and communicate with the saline tube.

[0017] In a preferred embodiment, the plurality of mapping branches first diverge and then converge at the distal end to form a network structure.

[0018] Optionally, the plurality of the mapping branches are connected in pairs to form at least two ring members, with the distal ends of all the ring members remaining relatively fixed.

[0019] In a preferred embodiment, the plurality of mapping branches are distributed distally to make the mapping portion claw-shaped.

[0020] In summary, the high-density mapping catheter provided by the present invention includes a handle, a catheter body, and a mapping portion; the mapping portion includes multiple mapping branches, and the ridge of each mapping branch is connected to a fixed connection portion at the distal end of the catheter body through a corresponding first connection portion; the fixed connection portion is provided with an infusion tube, the end of which has a metal tip, and an infusion hole communicating with the outside is provided on the outside of the infusion tube, and a distal outlet tube is provided inside the infusion tube; the distal outlet tube includes a reservoir, and a cooling medium passes sequentially through the proximal tube, the reservoir, and the infusion hole; the metal tip is configured to allow contact with blood but not with tissue to obtain far-field signals.

[0021] This configuration uses the metal tip of the filling tube as the far-field electrode. The metal tip is both part of the filling tube and performs the function of the far-field electrode, eliminating the need for it to be located inside the filling tube. This provides more space for the filling system, improving the distribution of the cooling medium within the filling tube while providing the far-field electrode function, thus enhancing the filling effect. Furthermore, this compact design simplifies the basic structure of the filling tube and reduces process costs. Attached Figure Description

[0022] Those skilled in the art will understand that the accompanying drawings are provided to better understand the invention and do not constitute any limitation on the scope of the invention.

[0023] Figure 1 This is an overall schematic diagram of a high-density mapping catheter according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of a distal portion of a high-density mapping catheter according to an embodiment of the present invention.

[0025] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0026] Figure 4 This is a schematic diagram of the annular component of a high-density mapping catheter according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of a claw-shaped high-density mapping catheter according to an embodiment of the present invention.

[0028] Figure 6a This is a partially enlarged structural diagram of the solid metal tip of the claw-shaped high-density mapping catheter according to an embodiment of the present invention.

[0029] Figure 6b This is a partially enlarged structural diagram of the hollow metal tip of the claw-shaped high-density mapping catheter according to an embodiment of the present invention.

[0030] Figure 7 This is a cross-sectional schematic diagram of the catheter body of the high-density mapping catheter according to an embodiment of the present invention.

[0031] In the attached image:

[0032] 1-Marking section; 2-Bendable section; 3-Main body section; 4-Handle;

[0033] 10 - Mapping branch; 110 - Ridge;

[0034] 101-First connecting part; 102-Second connecting part; 103-Third connecting part; 104-Ring electrode; 105-Connector;

[0035] 1001 - First ring component; 1002 - Second ring component; 1003 - Third ring component;

[0036] 20 - Fixed connection part;

[0037] 30 - Injection tube; 31 - Tube body; 32 - Metal head end; 33 - Injection hole;

[0038] 301 - Saline tubing; 401 - Single-lumen tubing; 402 - Nickel-titanium stent;

[0039] 5-Wire; 501-Wire cavity. Detailed Implementation

[0040] To make the objectives, advantages, and features of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and may sometimes use different scales.

[0041] As used herein, the singular forms “a,” “an,” “one,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature; “one end” and “the other end,” and “proximal” and “distal” generally refer to two corresponding portions, which include not only the endpoints. The terms “proximal” and “distal” are defined herein in relation to a mapping catheter having an end for insertion into the human body and a manipulator end extending outside the body. The term "proximal" refers to the position closer to the manipulatory end of the mapping catheter protruding from the body, and the term "distal" refers to the position closer to the end of the mapping catheter inserted into the body and therefore further away from the manipulatory end of the mapping catheter. Optionally, in manual or hand-operated applications, the terms "proximal" and "distal" are defined herein relative to the operator, such as a surgeon or clinician. The term "proximal" refers to the position closer to the operator, and the term "distal" refers to the position closer to the mapping catheter and therefore further away from the operator. Furthermore, as used in this invention, "installed," "connected," "attached," and "set" of one element on another should be interpreted broadly, generally indicating only a connection, coupling, mating, or transmission relationship between the two elements, which can be direct or indirect through an intermediate element, and should not be construed as indicating or implying a spatial positional relationship between the two elements, i.e., one element can be located inside, outside, above, below, or to one side of the other element, unless otherwise explicitly stated. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, directional terms such as above, below, up, down, upward, downward, left, right, etc., are used relative to exemplary embodiments as they are shown in the figures, with upward or up direction pointing towards the top of the corresponding figure, and downward or down direction pointing towards the bottom of the corresponding figure.

[0042] The purpose of this invention is to provide a high-density mapping catheter to solve the problem that the far-field electrode layout of existing mapping catheters limits the catheter cross-section and electrode layout. The following description refers to the accompanying drawings.

[0043] Please refer to Figure 1This invention provides a high-density mapping catheter, which includes: a handle 4, a catheter body 3, and a mapping portion 1; generally, the distal portion of the catheter body 3 also includes a bendable section 2 for bend control, and the description of the portion of the catheter body is detailed below.

[0044] See Figures 2-7 The mapping portion 1 is located at the distal end of the catheter body 3. The mapping portion 1 includes multiple mapping branches 10. Each mapping branch 10 includes a first connecting portion 101 and a ridge portion 110. The ridge portion 110 is provided with at least two ring electrodes 104 in sequence along the length direction. The ring electrodes 104 are used to contact the tissue to obtain electrocardiogram signals.

[0045] The ridge 110 of each of the mapping branches 10 is connected to the fixed connection portion 20 at the distal end of the catheter body 3 via the corresponding first connection portion 101;

[0046] The fixed connection part 20 is provided with an injection tube 30, the injection tube 30 has a metal head end 32 at the end, the injection tube 30 has an injection hole 33 communicating with the outside, and the injection tube 30 has a distal outlet pipe inside; the distal outlet pipe includes a liquid storage chamber (inside, not shown in the figure).

[0047] The metal tip 32 is configured to allow contact with blood but not with tissue to acquire far-field signals.

[0048] When using a high-density mapping catheter for electrophysiological ablation, the catheter is delivered to the patient's heart via femoral vein puncture, allowing the soft distal mapping portion to contact the cardiac tissue and acquire intracardiac electrical signals. However, the signals acquired by the ring electrode on the distal mapping portion also include other interfering signals, such as far-field signals from blood or other tissue regions. The high-density mapping catheter provided in this embodiment includes a mapping structure that can adhere to the tissue for multi-directional electrical signal collection, while a far-field electrode is designed at the distal end of the perfusion tube, which does not adhere to the tissue and can collect electrocardiographic signals conducted in the blood from areas far from the contacted tissue.

[0049] Furthermore, existing far-field electrodes are generally located at the center of the catheter and bound within the perfusion channel, limiting the distribution of the cooling medium in the perfusion system, affecting the cooling effect, and also resulting in higher manufacturing costs. The high-density mapping catheter provided in this embodiment of the invention uses the distal metal tip of the perfusion tube as the far-field electrode. This metal tip is both a part tightly connected to the perfusion tube structure and an integral part of the perfusion system, optimizing the perfusion effect, and also serves as a far-field electrode for far-field signal acquisition. This achieves both optimized perfusion system and far-field signal acquisition.

[0050] Understandably, the distal outlet pipe is located inside the main body 31, and the liquid storage chamber is the distal end of the distal outlet pipe. The liquid storage chamber allows for greater distribution and longer residence time of the injected liquid, thus improving the cooling effect.

[0051] Understandable, refer to Figure 6a , 6b The metal tip 32 is electrically connected to a wire 5, which passes through the inner cavity of the conduit body 3 and is electrically connected to the handle 4 to achieve far-field signal transmission.

[0052] Specifically, refer to Figure 7 The high-density mapping catheter body section 3 includes a saline tube 301, which extends through the catheter body section 3 to a corresponding saline tube interface. The saline tube 301 connects distally to the infusion tube 30. The saline tube 301, infusion tube 30, saline tube interface, and external cooling medium source (e.g., cold saline) together constitute a saline infusion pathway to cool the heat generated by the annular electrode 104 of the mapping branch 10 at the distal end of the catheter and the metal tip 32 acting as the far-field electrode. Figure 7 The catheter also includes a lead wire cavity 501 and single-lumen tubes 401 and nickel-titanium supports 402 arranged in layers from the outside to the inside. The single-lumen tubes 401 and nickel-titanium supports 402 serve as the basic structural framework of the catheter, providing insulation, protection, flexibility, and bending resistance. Multiple lead wire cavities 501 are provided, each corresponding to the lead wire 5 connected to the metal tip 32 and the lead wire extending from the ring electrode 104. The lead wires within each lead wire cavity 501 are covered with an insulating layer material, allowing the metal tip and ring electrode to be safely electrically connected to the handle 4 after passing through the catheter body via the lead wires.

[0053] Preferably, the infusion tube 30 includes a non-metallic tube body 31 and a solid metal end 32 located at the distal end of the tube body 31. The metal end 32 is connected to the tube body 31 by one of the following methods: nesting, tenon and mortise, or interference fit. In this case, the metal end 32 is solid and tightly connected to the tube body 31. The metal end 32 does not affect the function of the liquid storage chamber in the tube body 31. The distal outlet pipe is the cavity inside the tube body 31, and the liquid storage chamber is part of this cavity.

[0054] Correspondingly, as another preferred embodiment, the injection pipe includes a non-metallic pipe body 31 and a metal head end 32, the metal head end 32 having an inner cavity, and the inner cavity of the metal head end 32 being part of the liquid storage cavity; in this case, the distal outlet pipe includes not only the cavity inside the pipe body 31 but also the inner cavity of the metal head end 32, so that when the injection liquid passes through the distal outlet pipe, the volume of the liquid storage cavity it passes through is larger, further extending the residence time of the injection liquid and improving the cooling effect.

[0055] Optionally, the metal head end also has a filling hole 33 that connects the inner cavity of the metal head end 32 to the outside. It can be understood that the addition of the filling hole 33 to the metal head end 32 allows the cooling medium to pass through both the main body 31 of the filling pipe and extend through the metal head end 32 when it exits, making the cooling medium path more complex and its distribution wider, which is beneficial to expanding the coverage of the filling system.

[0056] In a preferred embodiment, the number of infusion holes 33 is 6 to 66. This arrangement of the number of infusion holes allows for customization and distribution based on the conduit structure and the desired scenario. For example, 6 or 12 holes can be evenly distributed circumferentially, or 24, 36, 48, or 66 holes can be distributed evenly around the outside of the liquid storage cavity. The specific distribution varies depending on the conduit structure and is not limited here.

[0057] Optionally, there is one distal outlet pipe; or, in another embodiment, there are multiple distal outlet pipes, which are connected and converged by a transverse connecting pipe and connected to the brine pipe 301. The advantage of this design is that the distribution of the cooling medium can be adjusted according to the actual situation, and multiple filling pipes and metal heads can be set for the multiple distal outlet pipes, which is not limited here.

[0058] Specifically, as some preferred implementation methods, such as Figure 2 , 3 As shown in Figure 4, the mapping section 1 includes multiple mapping branches 10, which diverge distally and then converge to form a mesh structure; wherein, the multiple mapping branches 10 are connected in pairs to form at least two ring members, and the distal ends of all the ring members remain relatively fixed. In some naming conventions in the art, this type of high-density mapping catheter is referred to as a planar or flat high-density mapping catheter.

[0059] To facilitate connection, in this embodiment, the first connecting portion 101 may have a certain curvature, and further includes a second connecting portion 102 and a third connecting portion 103. The second connecting portion 102 may be straight, arc-shaped, etc., and the second connecting portion 102 is the main body of the ridge 110. The two ends of the third connecting portion 103 are respectively connected to the distal ends of the two ridges 110 of the ring member. All the third connecting portions 103 of the ring member are fixed by a connector 105. Each first connecting portion 101 is sequentially connected to the second connecting portion 102 and the third connecting portion 103 towards its distal end, and continues to be sequentially connected to another set of second connecting portions 102 and first connecting portions 101 to form the ring member. For the specific structure of the ring member, see [link to relevant documentation]. Figure 4The ring components include a first ring component 1001, a second ring component 1002, and a third ring component 1003 nested from the outside in, wherein the first ring component 1001 is the largest ring component and the third ring component 1003 is the smallest ring component. The ring components are not necessarily nested; they can also intersect each other, for example, two larger second ring components intersect each other, and a smaller third ring component is located in the intersection area of ​​the two second ring components. The ridge 110 is provided with at least two ring electrodes 104 sequentially along its length; all the first connecting portions 101 are connected to the fixed connecting portion 20 at the distal end of the catheter body 3.

[0060] The fixed connection portion 20 is provided with an infusion tube 30, which includes a non-metallic tube body 31 and a metal tip 32. The metal tip 32 has an inner cavity. The infusion tube 30 has an infusion hole 33 communicating with the outside, and the metal tip also has an infusion hole 33 communicating with the inner cavity of the metal tip 32 and the outside. The infusion tube 30 has a distal outlet pipe. The distal outlet pipe includes a liquid storage chamber, and the inner cavity of the metal tip 32 is part of the liquid storage chamber. The metal tip 32 is configured to allow contact with blood but not with tissue to obtain far-field signals. Given that the flat high-density mapping catheter is relatively flat, when it is attached to the tissue from the side, the perfusion tube 30 located in the center and its distal metal tip 32 are more likely to come into contact with the tissue. Therefore, the perfusion structure preferably has multiple perfusion holes 33 and a liquid reservoir, so that the cooling medium is more evenly distributed when it is sprayed outward and forms a liquid film between the catheter and the tissue, which is more conducive to the acquisition of far-field signals rather than contact with the tissue.

[0061] Of course, if the flat high-density mapping catheter structure is reasonably designed, such as by using intersecting ring components to make the structure more three-dimensional, and multiple first connecting parts 101 can cover the infusion tube 30, then the scheme in which the metal head end 32 is solid and tightly integrated with the tube body 31 can also be adopted.

[0062] Continue to refer to Figure 5 , 6a In some other preferred embodiments, 6b and 7, the plurality of mapping branches 10 are distributed distally to make the mapping portion claw-shaped. In the typical nomenclature of the art, such a high-density mapping catheter is called a multi-claw / claw-shaped high-density mapping catheter, typically including a five-claw high-density mapping catheter, a six-claw high-density mapping catheter, an eight-claw high-density mapping catheter, etc.

[0063] In this embodiment, the first connecting portion 101 may have a certain curvature, and each first connecting portion 101 is connected distally to the ridge portion 110. The ridge portion 110 is provided with at least two ring electrodes 104 sequentially along its length. All first connecting portions 101 are connected to the fixed connecting portion 20 at the distal end of the catheter body 3. Typically, the number of first connecting portions 101 and ridge portions 110 is eight. It is understood that the number of first connecting portions 101 and ridge portions 110 can be designed according to actual needs, and will not be elaborated here.

[0064] The fixed connection portion 20 is provided with an infusion tube 30, which includes a non-metallic tube body 31 and a metal end 32, the metal end 32 having an inner cavity; the infusion tube 30 has an infusion hole 33 communicating with the outside; the infusion tube 30 has a distal outlet pipe, the distal outlet pipe including a liquid storage chamber; the metal end 32 is configured to allow contact with blood but not with tissue to obtain far-field signals. The infusion structure preferably has multiple infusion holes 33 and a liquid storage chamber, making the distribution of the cooling medium more uniform when it is sprayed outwards.

[0065] like Figure 6a Preferably, the infusion tube 30 includes a non-metallic tube body 31 and a solid metal tip 32 located at the distal end of the tube body 31. The metal tip 32 is connected to the tube body 31 by one of the following methods: nesting, tenon and mortise, or interference fit. With this configuration, the claw-shaped high-density mapping catheter adheres vertically to the tissue during mapping, and there is a gap between the infusion tube 30 and the tissue. Blood flowing through this gap can contact the metal tip, facilitating the acquisition of far-field signals by the metal tip 32. Furthermore, this structure is relatively simple to manufacture and saves costs.

[0066] like Figure 6b Alternatively, the infusion tube comprises a non-metallic tube body 31 and a metal tip 32. The metal tip 32 has an inner cavity, which is part of the reservoir. The metal tip 32 also has an infusion port 33 connecting the inner cavity of the metal tip 32 to the outside. With this configuration, the distal outlet tube includes not only the cavity inside the tube body 31 but also the inner cavity of the metal tip 32. Therefore, when the claw-shaped high-density mapping catheter is used for mapping, because it adheres vertically to the tissue, the volume of the reservoir through which the infusion fluid passes is larger, further expanding the space for cooling and extending the residence time of the infusion fluid. This is particularly suitable for claw-shaped high-density mapping catheters with a relatively large extension range.

[0067] Of course, this method can also be used for high-density mapping of other morphologies of vascular bundles, such as basket-shaped, planar net-shaped, and inflorescence-shaped vascular bundles, which will not be elaborated here.

[0068] In summary, the high-density mapping catheter provided by the present invention includes: a handle, a catheter body, and a mapping portion; the mapping portion includes multiple mapping branches, each mapping branch including a first connecting portion and a ridge; the ridge is provided with at least two ring electrodes in sequence along its length, the ring electrodes being used to contact tissue to obtain electrocardiogram signals; the ridge of each mapping branch is connected to a fixed connection portion at the distal end of the catheter body through a corresponding first connecting portion; the fixed connection portion is provided with an infusion tube, the end of the infusion tube having a metal tip, the infusion tube having an infusion port communicating with the outside, and a distal outlet tube being provided inside the infusion tube; the distal outlet tube includes a reservoir; the metal tip is configured to allow contact with blood but not with tissue to obtain far-field signals. This configuration uses the metal tip of the infusion tube as the far-field electrode. The metal tip is both part of the infusion tube and performs the function of a far-field electrode, eliminating the need for it to be located inside the infusion tube. This provides more space for the infusion system, improving the distribution of the cooling medium within the infusion tube while providing the far-field electrode function, thus enhancing the infusion effect. In different configurations of high-density mapping conduits, optimization can be further performed based on specific requirements. For example, choosing solid or hollow metal tips offers advantages in different configurations and application scenarios. Furthermore, this compact design simplifies the basic structure of the infusion tube, reducing manufacturing costs.

[0069] It should be noted that the above embodiments can be combined with each other. The above description is only a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. A high-density mapping catheter, characterized in that, include: The device comprises a handle, a catheter body, and a mapping section; the mapping section includes multiple mapping branches, each of which includes a first connecting portion and a ridge; the ridge is provided with at least two ring electrodes along its length, the ring electrodes being used to contact tissue to obtain electrocardiogram signals; The ridge of each of the mapping branches is connected to the fixed connection portion at the distal end of the catheter body via the corresponding first connection portion; The fixed connection part is provided with an injection tube, the end of which has a metal head end. The injection tube has an injection hole that communicates with the outside. The injection tube has a distal outlet pipe inside. The distal outlet pipe includes a liquid storage chamber. The metal tip is configured to allow contact with blood but not with tissue to acquire far-field signals.

2. The high-density mapping catheter according to claim 1, characterized in that, The injection tube includes a non-metallic tube body and a solid metal head located at the distal end of the tube body. The metal head is connected to the tube body by one of the following methods: nesting, tenon and mortise, or interference fit.

3. The high-density mapping catheter according to claim 1, wherein the infusion tube comprises a non-metallic tube body and a metal tip, the metal tip having an inner lumen, and the inner lumen of the metal tip being part of the reservoir.

4. In the high-density mapping catheter according to claim 3, the metal tip is also provided with an injection port that connects the inner cavity of the metal tip to the outside.

5. A high-density mapping catheter according to claim 1, characterized in that, The number of injection holes is 6 to 66.

6. The high-density mapping catheter according to claim 1, characterized in that, The metal head end is electrically connected to a wire, which passes through the inner cavity of the catheter body and is electrically connected to the handle.

7. A high-density mapping catheter according to claim 1, characterized in that, The catheter body also extends into a saline tube, and there are multiple distal outlet tubes, which are connected and converged by a transverse connecting tube and connected to the saline tube.

8. A high-density mapping catheter according to any one of claims 1 to 7, characterized in that, The multiple mapping branches first diverge and then converge at the far end to form a network structure.

9. A high-density mapping catheter according to claim 8, characterized in that, The plurality of the survey branches are connected in pairs to form at least two ring members, and the distal ends of all the ring members remain relatively fixed.

10. A high-density mapping catheter according to any one of claims 1 to 7, characterized in that, The multiple mapping branches are distributed distally to make the mapping portion claw-shaped.

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