High-density mapping catheter

Abstract

The present invention provides a high-density mapping catheter, which comprises a catheter body and a distal end mapping part. The distal end mapping part comprises a plurality of mapping branches and a far-field electrode arranged on one of the mapping branches, and a proximal end of each mapping branch is fixedly connected to a distal end of the catheter body; each mapping branch comprises a first connecting part and a ridge part, and at least two ring electrodes are sequentially arranged on the ridge part in a length direction; the ridge part of each mapping branch is connected to the distal end of the catheter body by means of a corresponding first connecting part; the far-field electrode is arranged on the first connecting part of one of the mapping branches, and the far-field electrode is configured to allow contact with blood but not with tissues so as to obtain a far-field signal. That is, the high-density mapping catheter provided by the present invention eliminates the dependency of the arrangement of the distant-field electrode on the need for a central saline perfusion pathway of a catheter. With this far-field electrode arrangement, existing perfusion schemes in the prior art can be optimized to achieve double-side saline perfusion.

Description

A high-density mapping catheter Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a high-density mapping catheter. Background Art

[0002] Atrial fibrillation (AF) is one of the most common clinical arrhythmias and a major challenge facing the global cardiovascular disease field in the 21st century. Catheter ablation is currently an effective treatment for AF. Mapping catheters are essential tools for physicians to track the source of the disease and develop ablation plans. High-density mapping catheters can map the entire cardiac chamber, shortening mapping time.

[0003] The high-density mapping catheter commonly used in the prior art collects intracardiac far-field signals by setting a reference electrode on the outside of the central saline tube of the catheter. This design requires that the catheter must have a central saline perfusion path, which imposes relatively large restrictions on the design of the catheter saline perfusion path. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-density mapping catheter to solve the problem in the prior art that a reference electrode is provided outside the central saline tube of the catheter, which greatly limits the design of the catheter perfusion path.

[0005] To solve the above problems, the present invention provides a high-density mapping catheter, comprising: a catheter body and a distal mapping portion;

[0006] The distal mapping portion includes a plurality of mapping branches and a far-field electrode provided on one of the mapping branches, and the proximal end of each mapping branch is fixedly connected to the distal end of the catheter body;

[0007] Each of the mapping branches includes a first connecting portion and a spine, wherein the spine is provided with at least two ring electrodes in sequence along the length direction, and the ring electrodes are used to contact tissue to obtain electrocardiographic signals; the spine of each mapping branch is connected to the distal end of the catheter body through the corresponding first connecting portion;

[0008] The far-field electrode is provided at the first connection portion of one of the mapping branches, and the far-field electrode is configured to allow contact with blood but not contact with tissue to acquire far-field signals.

[0009] Optionally, in the high-density mapping catheter, the plurality of mapping branches diverge toward the distal end so that the distal mapping portion is claw-shaped; or, the plurality of mapping branches first diverge toward the distal end and then converge to form a three-dimensional network structure.

[0010] Optionally, in the high-density mapping catheter, a plurality of the mapping branches are connected in pairs to form at least two ring members, and the distal ends of all the ring members remain relatively fixed.

[0011] Optionally, in the high-density mapping catheter, in a first side view, the distal mapping portion is mesh-shaped, wherein one of the ring members is located on the inner side, and each of the remaining ring members is arranged around the ring member located on the inner side;

[0012] In a second side view, the inner ring member and the other ring member are distributed on two different planes, and the two planes intersect on an extended line of the axis of the catheter body;

[0013] The second side perspective and the first side perspective are two perpendicular side perspectives.

[0014] Optionally, in the high-density mapping catheter, the distal ends of the plurality of mapping branches are all connected by a distal rod to form a closed two-dimensional network structure.

[0015] Optionally, in the high-density mapping catheter, the far-field electrode is arranged at the first connection portion of the mapping branch that is closer to the inner side.

[0016] Optionally, in the high-density mapping catheter, the first connecting part is provided with insulating parts at both ends of the far-field electrode, the surface of the insulating part has a first height difference relative to the surface of the first connecting part, the surface of the far-field electrode has a second height difference relative to the surface of the first connecting part, and the first height difference is greater than the second height difference.

[0017] Optionally, in the high-density mapping catheter, there is a third height difference between the surface of the insulating member and the surface of the far-field electrode, and the third height difference is less than 0.5 mm.

[0018] Optionally, in the high-density mapping catheter, the insulating member is fixed by applying insulating glue on both ends of the far-field electrode.

[0019] Optionally, in the high-density mapping catheter, the distance between the far-field electrode and the distal end of the catheter body is no more than 5 mm.

[0020] Optionally, in the high-density mapping catheter, the distal end of the catheter body includes a fixing member, and the distal ends of all the marked side branches are fixed by the fixing member; the fixing member has a saline perfusion passage, and the saline perfusion passage includes a main channel and two branch channels connected to the distal end of the main channel.

[0021] Optionally, in the high-density mapping catheter, the fixing part has two rows of fixing holes, which are respectively used to fix the proximal ends of the mapping branches located in two different planes. The entrance of the main channel is located on the side of one row of fixing holes away from the other row of fixing holes, and the outlets of the two branch channels are located on the side of the two rows of fixing holes away from each other.

[0022] Optionally, in the high-density mapping catheter, the mapping branch includes an internal support member and an insulating layer covering the internal support member, and at least the transverse cross-section of the internal support member of the spine is rectangular, and the long side direction of the rectangle is located in the direction in which the mapping branch is in contact with the tissue.

[0023] In summary, the high-density mapping catheter provided by the present invention comprises: a catheter body and a distal mapping portion; the distal mapping portion comprises a plurality of mapping branches and a far-field electrode disposed on one of the mapping branches, the proximal end of each mapping branch being fixedly connected to the distal end of the catheter body; each mapping branch comprises a first connecting portion and a spine, the spine being provided with at least two ring electrodes along its length, the ring electrodes being configured to contact tissue to acquire electrocardiographic signals; the spine of each mapping branch is connected to the distal end of the catheter body via the corresponding first connecting portion; the far-field electrode is disposed on the first connecting portion of one of the mapping branches, and is configured to allow contact with blood but not with tissue to acquire far-field signals. That is, in the high-density mapping catheter provided by the present invention, the far-field electrode is disposed outside the distal end of the catheter body. The placement of the far-field electrode no longer relies on the catheter having a central saline perfusion path. With this far-field electrode arrangement, existing perfusion schemes can be optimized to achieve bilateral saline perfusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0025] FIG1 is a schematic diagram of the overall structure of a high-density mapping catheter provided by an embodiment of the present invention;

[0026] FIG2 is a schematic diagram of the distal structure of a high-density mapping catheter provided by an embodiment of the present invention from a first side perspective;

[0027] FIG3 is a schematic diagram of the arrangement of the insulating member in an embodiment of the present invention;

[0028] FIG4 is a schematic diagram of the distal end structure of a high-density mapping catheter provided by an embodiment of the present invention from a second side perspective;

[0029] FIG5 is a schematic diagram of the distal structure when the distal mapping portion includes two ring members in an embodiment of the present invention;

[0030] FIG6 is a schematic diagram of the distal structure when the distal mapping portion includes three ring members in an embodiment of the present invention;

[0031] FIG7 is a schematic diagram of a local structure of the distal end of a high-density mapping catheter provided by an embodiment of the present invention;

[0032] FIG8 is a schematic structural diagram of the BB section in FIG7 ;

[0033] FIG9 is a schematic structural diagram of the AA section in FIG7 ;

[0034] 10 to 14 are schematic diagrams of the distal structure of another high-density mapping catheter with the same far-field electrode arrangement according to an embodiment of the present invention;

[0035] FIG15 is a schematic structural diagram of the CC section in FIG2 ;

[0036] FIG16 is a schematic diagram of a cross-sectional structure of a ridge portion according to an embodiment of the present invention;

[0037] FIG. 17 is a schematic diagram of another cross-sectional structure of the ridge portion in an embodiment of the present invention.

[0038] The descriptions of the reference numerals are as follows:

[0039] 1- distal mapping part; 2- bendable segment; 3- main segment; 4- handle;

[0040] 10-mapping branches;

[0041] 101 - first connecting portion; 102 - ridge; 103 - second connecting portion; 104 - ring electrode; 105 - far-field electrode; 106 - insulating member; 107 - fixing member; 108 - connecting member;

[0042] 201, 202-branch channels; 203-main channel;

[0043] 301 - first ring member; 302 - second ring member; 303 - third ring member; 304 - fourth ring member; 305 - fifth ring member;

[0044] 401, 402, 403, 404, 405, 406 - fixing holes;

[0045] 501-annular member; 502-first linear member; 503-second linear member;

[0046] 11- internal support; 12- insulation layer;

[0047] 110-Electrode lead. DETAILED DESCRIPTION

[0048] The present invention is described in further detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in illustrating the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis required to be shown in each drawing is different, and sometimes different proportions are used. It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third" and the like in the specification are only used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to represent the logical relationship or sequential relationship between the various components, elements, steps, etc. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of such features.

[0049] In this application document, "proximal" and "distal" refer to the relative orientation, position, and direction of components or actions relative to each other from the perspective of a doctor using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" generally refers to the end of the medical device that is close to the doctor during normal operation, and "distal" generally refers to the end that first enters the patient's body.

[0050] Please refer to Figure 1. An embodiment of the present invention provides a high-density mapping catheter, which includes: a catheter body and a distal mapping part 1. The catheter body can adopt a structure commonly used in the art, generally including a handle 4, a main body section 3 and a bendable section 2 connected in sequence from the proximal end to the distal end. For a detailed description of the parts of the catheter body, please refer to the following.

[0051] Please refer to Figure 2. The distal mapping part includes multiple mapping branches 10 and a far-field electrode 105 provided on one of the mapping branches. The proximal end of each mapping branch 10 is fixedly connected to the distal end of the catheter body; each mapping branch 10 includes a first connecting portion 101 and a spine 102. The spine 102 is connected to the distal end of the catheter body through the first connecting portion 101. The spine 102 is provided with at least two ring electrodes 104 in sequence along the length direction. The ring electrodes 104 are used to contact with tissue to obtain electrocardiogram signals; the spine 102 of each mapping branch 10 is connected to the distal end of the catheter body through the corresponding first connecting portion 101. The far-field electrode 105 is provided on the first connecting portion 101 of one of the mapping branches 10. The far-field electrode 105 is configured to allow contact with blood but not contact with tissue to obtain far-field signals. Preferably, the distance between the far-field electrode 105 and the distal end of the catheter body is no more than 5 mm, that is, the far-field electrode 105 is disposed close to the root of the mapping branch 10 .

[0052] When performing electrophysiological ablation using a high-density mapping catheter, the high-density mapping catheter is delivered to the patient's heart through femoral vein puncture, so that the soft distal mapping portion contacts the heart tissue to obtain intracardiac electrical signals. However, the signal obtained by the ring electrode on the distal mapping portion also contains other interfering signals, such as far-field signals from blood or other regional tissues. The high-density mapping catheter provided in this embodiment has a distal mapping portion 1 that includes a ring electrode that can be attached to the tissue, allowing for multi-directional electrical signal information collection. At the same time, the far-field electrode 105 designed near the proximal end of the mapping branch 10 does not adhere to the tissue and can collect ECG signals conducted in the blood from areas far away from the contacted tissue.

[0053] In addition, since the high-density mapping catheter provided by the embodiment of the present invention has the far-field electrode 105 arranged outside the distal end of the catheter body, the arrangement of the far-field electrode 105 no longer depends on the catheter having a central saline perfusion path. Under this arrangement of the far-field electrode 105, the existing perfusion scheme can be optimized to achieve bilateral saline perfusion.

[0054] Preferably, as shown in FIG3 , the first connecting portion 101 is provided with insulating members 106 at both ends of the far-field electrode 105. The surface of the insulating member 106 has a first height difference relative to the surface of the first connecting portion 101, and the surface of the far-field electrode 105 has a second height difference relative to the surface of the first connecting portion 101. The first height difference is greater than the second height difference, so that the far-field electrode 105 and the insulating members 106 at both ends form a concave structure with higher ends and lower center, thereby further reducing the probability of the far-field electrode 105 contacting tissue. Preferably, the height difference between the surface of the insulating member 106 and the surface of the far-field electrode 105 is less than 0.5 mm.

[0055] In some embodiments, the insulating member 106 can be formed by applying glue to both ends of the far-field electrode 105 and then curing it. This method is simple to operate. In other embodiments, the insulating member 106 can also be a ring-shaped insulating material that can be sleeved on the first connecting portion 101.

[0056] As previously described, the arrangement of the far-field electrodes 105 in this embodiment can optimize existing perfusion schemes and achieve bilateral saline perfusion. In a preferred embodiment of bilateral saline perfusion, as shown in FIG2 , the distal end of the catheter body may include a fixture 107 , through which all of the mapping branches 10 are secured. The fixture 107 has a saline perfusion pathway, which includes a main channel and two branch channels connected to the distal ends of the main channel. The main channel and the two branch channels are eccentrically disposed, and the outlets of the two branch channels are located at opposite ends of the axis of the fixture 107 .

[0057] In order to realize the arrangement of the main channel and the two branch channels in the fixing member 107, preferably, the fixing member 107 adopts a splicing structure, wherein one branch channel includes a transverse branch formed by transverse splicing of the splicing structure. In this way, a saline tube is passed through the main channel, and saline can flow to the two branch channels, achieving the purpose of bilateral perfusion and improving the perfusion effect without increasing the diameter of the catheter.

[0058] In an optional embodiment, the plurality of mapping branches 10 of the distal mapping portion are connected in pairs to form at least two ring members, and the distal ends of all the ring members remain relatively fixed. In this optional embodiment, under a first side perspective, i.e., the side perspective shown in FIG2 , the distal mapping portion is in a mesh shape, and some of the mapping branches 10 are located on the inner side, relatively closer to the extension line of the axis of the catheter body, and some of the mapping branches 10 are located on the outer side, relatively farther away from the extension line of the axis of the catheter body. Since the mapping branches 10 located on the outer side are more susceptible to deformation than the mapping branches 10 on the inner side, the probability of contact with tissue is relatively high. In view of this, it is preferable to arrange the far-field electrode 105 at the first connecting portion 101 of the mapping branch 10 that is closer to the inner side to reduce the probability of contact between the far-field electrode 105 and tissue.

[0059] In order to enable the ring electrode 104 to be in contact with the tissue in multiple directions, in this embodiment, the distal mapping part 1 can be further designed as follows: in a first side perspective, one of the ring members is located on the inner side, and each of the other ring members is arranged around the ring member located on the inner side; in a second side perspective, the ring member located on the inner side and the other ring members are distributed on two different planes, and the two planes intersect on the extension line of the axis of the catheter body, so that in the second side perspective, as shown in Figure 4, the distal mapping part 1 of the high-density mapping catheter is distributed in an inverted "V" shape; the second side perspective and the first side perspective are two side perspectives perpendicular to each other.

[0060] Please continue to refer to Figure 1. In order to facilitate connection, in this embodiment, further, the first connecting portion 101 may have a certain curvature. In addition to the ridge 102 and the first connecting portion 101, the ring member may also include a second connecting portion 103. The second connecting portion 103 may be arc-shaped, and the two ends of the second connecting portion 103 are respectively connected to the distal ends of the two ridges 102 of the ring member. The second connecting portions 103 of all the ring members are fixed by a connecting piece 108.

[0061] In the above embodiment, the eccentric setting of the main channel can avoid interference with the fixation of each of the mapping branches 10 in the fixing member 107. Specifically, in order to make the inner mapping branch 10 and the outer mapping branch 10 located on two non-coplanar planes, when fixing the inner mapping branch 10 and the outer mapping branch 10, please refer to Figures 8 and 9. The fixing member 107 has two rows of fixing holes, one row of fixing holes is used to fix the proximal end of the outer mapping branch 10, and the other row of fixing holes is used to fix the proximal end of the inner mapping branch 10. In order to avoid interference, the entrance of the main channel 203 is provided on the side of one row of fixing holes away from the other row of fixing holes. In order to achieve bilateral perfusion, the outlets of the two branch channels 201 and 202 are respectively provided on the side of the two rows of fixing holes away from each other.

[0062] In the above embodiment, the number of the ring members located on the inner side is one, and the number of the ring members located on the outer side can be one, two, or three, etc. For example, as shown in FIG5 , the distal mapping portion of the catheter includes two ring members, namely a first ring member 301 and a second ring member 302. In a first side view, the first ring member 301 is located on the inner side, and the second ring member 302 is located on the outer side. The distal ends of the first ring member 301 and the second ring member 302 are fixed by a connector 108, and there is no intersection between them. In this case, the number of the two rows of fixing holes of the fixing member 107 is two, which are used to fix the proximal ends of the two branches of the first ring member 301 and the second ring member 302, respectively.

[0063] For another example, as shown in FIG6 , the distal end mapping portion of the catheter includes three ring members, namely a third ring member 303, a fourth ring member 304 and a fifth ring member 305, wherein the third ring member 303 and the fourth ring member 304 together constitute an outer layer mapping member, and the third ring member 303 and the fourth ring member 304 can be arranged in an overlapping manner, but there is only one intersection, or the distal ends of the third ring member 303 and the fourth ring member 304 are arranged up and down without an intersection; the fifth ring member 305 is arranged on the inner side of the whole formed by the third ring member 303 and the fourth ring member, and is aligned with the third ring member 303 and the fourth ring member 304. do not intersect; at this time, the number of one row of fixing holes in the fixing piece 107 is four, which are respectively used to fix the proximal ends of the two ring members located on the outside, and the four branches of the two ring members correspond to the four fixing holes 401, 402, 403, and 404 as shown in Figures 8 and 9, and can be arranged alternately, or, wherein the two branches of one ring member are located between the two branches of the other ring member; the number of another row of fixing holes is 2, which are used to fix the proximal ends of the two branches of the ring member located on the inside, and the two branches of the ring member correspond to the two fixing holes 405 and 406 as shown in Figures 8 and 9.

[0064] The configuration of the far-field electrode 105 provided in the embodiment of the present invention is also applicable to distal catheters with other distal mapping structures. For example, as shown in Figure 10, the distal ends of multiple mapping branches 10 are all connected by a distal rod to form a closed two-dimensional mesh structure. For example, as shown in another catheter with a mesh mapping structure in Figure 11, the distal mapping part of the catheter includes an annular member 501, a first linear member 502 and a second linear member 503. The proximal end of the second linear member 503 located in the middle is fixed to the distal end of the catheter body, and the distal end is fixed to the annular member 501. The two first linear members 502 are arranged on both sides of the second linear member 503, and the proximal end and distal end of each first linear member 502 are fixed to the annular member 501. The annular member 501, the first linear member 502 and the second linear member 503 all constitute a mapping branch 10. It can be understood that in both embodiments, there is also a mapping branch 10 that is closer to the inside, and the far-field electrode 105 is arranged on the first connecting part 101 of the mapping branch 10 that is closer to the inside.

[0065] In addition, as shown in Figures 12 and 13, for high-density mapping catheters with open distal ends, the far-field electrodes 105 can also be set at the root of the central or near-central mapping branch 10, that is, close to the proximal end of the corresponding mapping branch 10.

[0066] For a high-density mapping catheter (not shown) in which multiple mapping branches diverge toward the distal end and then converge toward the distal end to form a three-dimensional network structure, there can be multiple options according to the design of the far-field electrode 105. The far-field electrode 105 can be set at the root of any branch, which can also avoid adhesion to the tissue.

[0067] In this embodiment, further, as shown in FIG15 , each of the mapping branches 10 includes an internal support member 11 and an insulating layer 12 covering the internal support member 11. Preferably, the transverse cross-section of at least the internal support member 11 of the ridge 102 is rectangular, and the long side direction of the rectangle is located in the direction in which the mapping branch is in contact with the tissue, that is, in the CC cross-sectional direction shown in FIG2 . The material of the internal support member 11 is a metal material with supporting properties such as nickel alloy, etc., wherein the cross-section of the internal support member 11 is set to a rectangular structure, which is conducive to the contact between the electrode bearing part and the tissue. The material of the insulating layer 12 is polyamide or polyurethane, and the outer diameter of the insulating layer 12 tube is less than 3F, which is convenient for the catheter to be used with an 8F or 8.5F sheath.

[0068] Figures 16 and 17 respectively illustrate the internal structure of the spine 102. As shown in Figure 16, the spine 102 may have only one cavity inside, and the internal support member 11 and the electrode wire 110 are both located in the cavity. Alternatively, as shown in Figure 17, the spine 102 is separated into two cavities by the insulating layer 12, and the internal support member 11 and the electrode wire 110 are located in different cavities.

[0069] In addition, in this embodiment, the bendable section 2 can adopt a multi-lumen tube section, preferably 4 lumens, one of which can be used for passing a saline tube, one lumen is used as a guide wire lumen, and two symmetrical lumens are used as pull wire lumens for passing a pull wire. The main section 3 is a slender tube body containing braided wires, which is used to connect the multi-lumen tube section and the handle. The braided wire has the functions of supporting the tube body, preventing deformation, and enabling the catheter torque to be transmitted proportionally. The proximal end of the handle 4 is provided with a tail wire socket, which is connected to each wire inside the catheter. The main section 3 can be connected to the handle 4 through a handle knob, and the handle knob is connected to the bendable section 2 through a pull wire for controlling the bending shape of the bendable section 2, or a bending control part is provided on the side wall of the handle 4, and the bending control part is connected to the bendable section 2 through a pull wire for controlling the bending shape of the bendable section 2.

[0070] In summary, the high-density mapping catheter provided by an embodiment of the present invention includes: a catheter body and a distal mapping portion; the distal mapping portion includes multiple mapping branches and a far-field electrode provided on one of the mapping branches, the proximal end of each mapping branch being fixedly connected to the distal end of the catheter body; each mapping branch includes a first connecting portion and a ridge, the ridge being provided with at least two ring electrodes in sequence along the length direction, the ring electrodes being used to contact tissue to obtain electrocardiographic signals; the ridge of each mapping branch is connected to the distal end of the catheter body via the corresponding first connecting portion; the far-field electrode is provided on the first connecting portion of one of the mapping branches, and the far-field electrode is configured to allow contact with blood but not with tissue to obtain far-field signals. In the high-density mapping catheter provided by the present invention, the far-field electrode is arranged outside the distal end of the catheter body. The arrangement of the far-field electrode no longer depends on the catheter having a central saline perfusion path. Under this far-field electrode arrangement, the existing perfusion scheme can be optimized to achieve bilateral saline perfusion.

[0071] 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. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A high-density mapping catheter, characterized in that: include: The catheter body and the distal mapping portion; The distal mapping portion includes a plurality of mapping branches and a far-field electrode disposed on one of the mapping branches, and the proximal end of each of the mapping branches is fixedly connected to the distal end of the catheter body; Each of the mapping branches comprises a first connection portion and a ridge portion, wherein the ridge portion is provided with at least two ring electrodes in sequence along the length direction, and the ring electrodes are used to contact with tissues to obtain electrocardiographic signals; the ridge portion of each of the mapping branches is connected to the distal end of the catheter body through the corresponding first connection portion; The far-field electrode is disposed at the first connection portion of one of the mapping branches, and the far-field electrode is configured to allow contact with blood but not contact with tissue to acquire a far-field signal.

2. The high-density mapping catheter according to claim 1, characterized in that: The plurality of mapping branches are distributed divergently toward the distal end so that the distal mapping portion is claw-shaped; or, the plurality of mapping branches first diverge toward the distal end and then converge to form a three-dimensional network structure.

3. The high-density mapping catheter according to claim 1, characterized in that: The plurality of mapping branches are connected in pairs to form at least two ring members, and the distal ends of all the ring members are kept relatively fixed.

4. The high-density mapping catheter according to claim 3, characterized in that: In a first side view, the distal end mapping portion is in a mesh shape, wherein one of the ring members is located at the inner side, and each of the remaining ring members is arranged around the ring member located at the inner side; In a second side view, the ring member located on the inner side and the other ring member are distributed on two different planes, and the two planes intersect on the extended line of the axis of the catheter body; The second side perspective and the first side perspective are two perpendicular side perspectives.

5. The high-density mapping catheter according to claim 1, characterized in that: The distal ends of the plurality of mapping branches are all connected by a distal rod to form a closed two-dimensional network structure.

6. The high-density mapping catheter according to claim 3 or 5, characterized in that: The far-field electrode is disposed at the first connection portion of the mapping branch that is closer to the inner side.

7. The high-density mapping catheter according to claim 1, characterized in that: The first connection portion is provided with insulating parts at both ends of the far-field electrode, the surface of the insulating part has a first height difference relative to the surface of the first connection portion, the surface of the far-field electrode has a second height difference relative to the surface of the first connection portion, and the first height difference is greater than the second height difference.

8. The high-density mapping catheter according to claim 7, characterized in that: A third height difference exists between the surface of the insulating member and the surface of the far-field electrode, and the third height difference is less than 0.5 mm.

9. The high-density mapping catheter according to claim 7, characterized in that: The insulating member is fixed by applying insulating glue on both ends of the far-field electrode.

10. The high-density mapping catheter according to claim 1, characterized in that: The distance between the far-field electrode and the distal end of the catheter body is no greater than 5 mm.

11. The high-density mapping catheter according to claim 1, characterized in that: The distal end of the catheter body includes a fixing piece, and the distal ends of all the side branches are fixed by the fixing piece; the fixing piece has a saline perfusion passage, and the saline perfusion passage includes a main channel and two branch channels connected to the distal end of the main channel.

12. The high-density mapping catheter according to claim 11, characterized in that: The fixing member has two rows of fixing holes, which are respectively used to fix the proximal ends of the mapping branches located in two different planes. The entrance of the main channel is located on the side of one row of the fixing holes away from the other row, and the exits of the two branch channels are located on the side of the two rows of the fixing holes away from each other.

13. The high-density mapping catheter according to claim 1, characterized in that: The mapping branch includes an internal support member and an insulating layer covering the internal support member. At least the transverse cross-section of the internal support member of the spine is a rectangle, and the long side of the rectangle is located in the direction in which the mapping branch is in contact with the tissue.

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