A multi-electrode ablation catheter with electrode edge perfusion

Abstract

This application provides a multi-electrode ablation catheter for edge perfusion. The catheter has at least one electrode, and each electrode has at least one perfusion orifice. The perfusion orifice is connected to a perfusion connector via a perfusion conduit within the catheter. During electrode discharge, the perfusion fluid is injected through the perfusion connector, flows through the perfusion conduit, and exits through the perfusion orifice, effectively expelling air bubbles adhering to the electrode and preventing microbubble aggregation, thereby avoiding the risk of arcing. This ablation catheter has a simple structure, requires no complex manufacturing process, and ensures stable results.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a multi-electrode ablation catheter for electrode edge perfusion. Background Technology

[0002] Catheter ablation is a primary treatment for cardiac arrhythmias. The procedure generally involves inserting a diagnostic and mapping catheter into the heart chamber via femoral vein puncture. The ablation catheter is then used to locate and treat the ablation target. After treatment, the ablation catheter is withdrawn from the body, and hemostasis is achieved at the puncture site. Compared to drug therapy, implantation therapy, and surgical intervention, catheter ablation offers advantages such as rapid effectiveness, minimal invasiveness, and low subsequent risks (no implants required).

[0003] The ablation catheter has electrodes at its tip, which discharge to the ablation target to achieve ablation. During electrode discharge, extremely strong electric fields are easily generated on the electrode surface, especially at the electrode edges, inducing electrochemical reactions and generating microbubbles. These microbubbles accumulate at the electrode edges, and because gas is a high insulator, it blocks the current path, further increasing the local current density. When microbubbles accumulate to an extreme degree, the extremely high local current can lead to electron avalanche effects within the bubbles, gas insulation breakdown, and in severe cases, liquid insulation breakdown, i.e., an electric arc. The occurrence of an electric arc is accompanied by a strong shock wave and high temperature release, posing a risk of myocardial damage, perforation, vascular constriction, and rupture. Summary of the Invention

[0004] In view of this, the purpose of this application is to propose a multi-electrode ablation conduit for electrode edge perfusion to solve the problem of easy bubble accumulation at the electrode edge and avoid electric arc.

[0005] To achieve the above objectives, this application provides a multi-electrode ablation catheter for edge perfusion, comprising a catheter, at least one electrode on the catheter, and at least one perfusion port on the electrode;

[0006] The infusion hole is connected to the infusion connector via the infusion pipeline inside the conduit. When the electrode discharges, the infusion fluid is injected through the infusion connector, flows out through the infusion pipeline and the infusion hole, and is used to expel air bubbles attached to the electrode.

[0007] Optionally, the distal end of the catheter is provided with an end electrode, the distal end of the end electrode is provided with at least one of the infusion holes, and / or the proximal end of the end electrode is provided with at least one of the infusion holes, and each infusion hole of the end electrode is connected to the infusion connector through an infusion conduit.

[0008] Optionally, the end electrode is a hollow electrode with a cavity, and the infusion port includes an inlet port and at least one outlet port. The inlet port is located on the side of the hollow electrode that is in contact with the conduit, and each outlet port is located on the other side of the hollow electrode that is not in contact with the conduit. The inlet port is connected to the infusion pipeline.

[0009] Optionally, a plurality of ring electrodes are provided around the conduit at intervals, and at least one of the infusion holes is provided at the distal end of the ring electrodes, and / or at least one of the infusion holes is provided at the proximal end of the ring electrodes, and each infusion hole of each ring electrode is connected to the infusion connector through an infusion conduit.

[0010] Optionally, the ring electrode is a hollow electrode with a cavity, and the infusion hole includes an inlet hole and at least one outlet hole. The inlet hole is located on the side of the hollow electrode that is in contact with the conduit, and each outlet hole is located on the other side of the hollow electrode that is not in contact with the conduit. The inlet hole is connected to the infusion pipeline.

[0011] Optionally, the number of outflow holes is one, and the positions of the inflow holes and outflow holes correspond to each other; or, the number of outflow holes is multiple, and the multiple outflow holes are arranged at equal intervals.

[0012] Optionally, the electrode leads of the electrode are isolated from the infusion line.

[0013] Optionally, the conduit includes an insulating inner tube, the electrode is provided on the outer surface of the insulating inner tube, the electrode lead is embedded in the wall of the insulating inner tube, and the infusion line is provided in the insulating inner tube.

[0014] Optionally, the electrode includes a terminal electrode and / or a ring electrode, the terminal electrode and / or the ring electrode being a solid electrode, the injection hole penetrating through the solid electrode, and the solid electrode being sealed to the electrode lead.

[0015] Optionally, the ablation catheter is connected to a control unit, which is used to determine one or more target electrodes that need to participate in the discharge based on the target location, control a signal generator to apply an electrical signal to the target electrode, and control a perfusion pump to inject perfusion fluid into the perfusion connector corresponding to the target electrode.

[0016] As described above, the multi-electrode ablation catheter for electrode edge perfusion provided in this application has at least one electrode on the catheter, and at least one perfusion hole on the electrode. The perfusion hole is connected to a perfusion connector via a perfusion conduit inside the catheter. When the electrode discharges, the perfusion fluid is injected through the perfusion connector, flows out through the perfusion conduit and the perfusion hole, and is used to expel air bubbles attached to the electrode, thus avoiding the accumulation of microbubbles and the risk of electric arc. This ablation catheter has a simple structure, requires no complex manufacturing process, and can ensure stable results. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 These are schematic diagrams of the ablation catheters in some embodiments;

[0019] Figure 2 for Figure 1 A cross-sectional view of a portion of the structure of the ablation catheter shown;

[0020] Figure 3 for Figure 1 The diagram shows the finite element simulation results of the current density of the ablation catheter during dual-electrode discharge.

[0021] Figure 4 for Figure 1 A schematic diagram of the finite element simulation results of the electric field intensity of the ablation catheter during dual-electrode discharge.

[0022] Figure 5 for Figure 1 A schematic diagram of microbubbles accumulating at the electrode edges of the ablation catheter during dual-electrode discharge.

[0023] Figure 6 for Figure 1 A schematic diagram showing the breakdown arc occurring in the ablation catheter during dual-electrode discharge;

[0024] Figure 7 This is a schematic diagram of the structure of the multi-electrode ablation catheter for electrode edge perfusion according to an embodiment of this application;

[0025] Figure 8 This is a schematic diagram of the end electrodes in an embodiment of this application;

[0026] Figure 9 This is a schematic diagram of the structure of the end electrode and the ring electrode in an embodiment of this application;

[0027] Figure 10 This is a partial structural diagram of the catheter according to an embodiment of this application;

[0028] Figure 11 This is a schematic diagram showing the external appearance of a portion of the catheter structure according to an embodiment of this application;

[0029] Figure 12 This is a schematic diagram of the cross-sectional structure of the catheter according to an embodiment of this application;

[0030] Figure 13 This is a schematic diagram of the infusion pipeline and electrode leads according to an embodiment of this application;

[0031] Figure 14 for Figure 13 Cross-sectional view of the structure shown;

[0032] Figure 15 This is a schematic diagram of the structure of the hollow electrode according to an embodiment of this application;

[0033] Figure 16 for Figure 15 A partial structural schematic diagram of the hollow electrode shown.

[0034] Figure 17 This is a cross-sectional view of a conduit including a hollow electrode, according to an embodiment of this application.

[0035] Figure 18 This is a cross-sectional view of a conduit including a solid electrode, according to an embodiment of this application.

[0036] Figure 19 This is a schematic diagram of the structure of the injection connector according to an embodiment of this application;

[0037] Figure 20 This is a schematic diagram of the connection structure between the ablation catheter and the control unit in an embodiment of this application. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0039] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0040] like Figure 1 As shown, in related technologies, the ablation catheter includes a catheter 10, a handle 12, and a signal generator 13. The proximal end of the catheter 10 is connected to the signal generator 13 via the handle 12, and the distal end of the catheter 10 is provided with at least one electrode 11. The electrode leads of each electrode are connected to the signal generator 13 through the interior of the catheter 10 and the handle 12. The signal generator 13 applies an electrical signal to two adjacent electrodes, and the ablation target is ablated using a bipolar discharge method of inter-electrode discharge. The electrical signal can be a radio frequency signal or a pulsed electric field signal; there is no specific limitation, as long as the released electrical signal is sufficient for ablation.

[0041] like Figure 2-6 As shown, electrode 11 is fixed to the outer wall of catheter 10 by processes such as bonding and hot melting, and electrode 11 is flush with the insulating layer of catheter 10. When two adjacent electrodes discharge, the electric field strength and current density generated at the electrode edge are the strongest. Therefore, electrochemical reactions easily occur at the electrode edge, leading to an increase in H in the blood. + O 2- Cl - Plasma ionization forms microbubbles that adhere to the edge of the electrode. If a high-voltage signal is continuously output to the electrode, the microbubbles will continue to accumulate, posing a risk of generating a breakdown arc.

[0042] In some methods, a conductive coating is applied to the electrode edge to reduce the local electric field intensity, prevent microbubble aggregation, and thus prevent arcing. However, this method requires configuring coating parameters (coating thickness, conductivity, etc.) and applying the coating using a conductive coating process, which increases the manufacturing difficulty of the ablation catheter. Moreover, the coating may peel off, affecting the effectiveness.

[0043] In view of this, embodiments of this application provide a multi-electrode ablation catheter for edge perfusion of electrodes. Perfusion holes are opened on the electrodes of the ablation catheter. The perfusion holes are connected to a perfusion connector for injecting perfusion fluid through a perfusion pipeline. When the electrode discharges, perfusion fluid is injected through the perfusion connector. The perfusion fluid flows out through the perfusion holes through the perfusion pipeline. The outflowing perfusion fluid is used to expel the generated microbubbles, avoid the accumulation of microbubbles, and thus avoid the occurrence of electric arc.

[0044] The present application will be explained in detail below with reference to the accompanying drawings and embodiments.

[0045] like Figure 7-18 As shown, this application embodiment provides a multi-electrode ablation catheter for electrode edge perfusion. The ablation catheter includes a catheter 20, at least one electrode 21 is provided on the catheter 20, and at least one perfusion hole 22 is provided on the electrode 21.

[0046] The injection hole 22 is connected to the injection connector 24 via the injection line 23 inside the conduit. When the electrode 21 discharges, the injection fluid is injected through the injection connector 24, flows out through the injection line 23 and the injection hole 22, and is used to expel air bubbles attached to the electrode.

[0047] The multi-electrode ablation catheter provided in this embodiment has an infusion hole 22 on the electrode 21 and an infusion conduit 23 inside the catheter 20. The infusion hole 22 is connected to an infusion connector 24 for injecting infusion fluid through the infusion conduit 23. When the electrode 21 discharges, the infusion fluid is injected through the infusion connector 24. The infusion fluid flows through the infusion conduit 23 and out through the infusion hole 22. The outflowing infusion fluid can displace microbubbles attached to the electrode, preventing microbubble aggregation and thus avoiding the risk of arcing. The ablation catheter of this application is not only simple in structure and requires no complex manufacturing process, but also ensures stable and reliable working performance.

[0048] In some embodiments, the distal end of the catheter 20 is provided with an end electrode 210, the distal end of the end electrode 210 is provided with a plurality of infusion holes 220, and / or the proximal end of the end electrode 210 is provided with a plurality of infusion holes 221, and each infusion hole of the end electrode 210 is connected to the infusion connector 24 through an infusion conduit.

[0049] Combination Figure 8 As shown, in this embodiment, a terminal electrode 210 is provided at the end of the conduit 20, and the terminal electrode 210 is provided with multiple infusion holes. Specifically, multiple infusion holes 220 can be provided at the distal edge of the terminal electrode 210, or multiple infusion holes 221 can be provided at the proximal edge of the terminal electrode 210, or multiple infusion holes can be provided at both the distal and proximal edges of the terminal electrode 210. When the terminal electrode 210 discharges, the infusion fluid flowing out of the infusion holes at the distal edge and / or proximal edge of the terminal electrode 210 can dispel microbubbles.

[0050] In some methods, the end electrode is a hollow electrode with a cavity. The perfusion port includes one inlet hole and at least one outlet hole. The inlet hole is located on the side of the hollow electrode that is in contact with the conduit, and each outlet hole is located on the other side of the hollow electrode that is not in contact with the conduit. The inlet hole is connected to the perfusion line. The perfusion fluid flows into the hollow electrode through the perfusion line and the inlet hole, and flows out evenly through each outlet hole, expelling air bubbles attached to the electrode. Optionally, the perfusion fluid is saline. The outflowing saline not only expels air bubbles but also cools the electrode and the surrounding blood, preventing scab formation and vapor bursting. Since the main heat for ablation is the impedance heat generated by the end electrode and the tissue, and the temperature inside the tissue is the highest, the saline does not affect the ablation effect.

[0051] In other embodiments, the end electrode is a solid electrode, and a filling hole is provided at a predetermined position through the solid electrode. This filling hole is connected to a filling pipeline, and the filling fluid flows out through the filling pipeline and the filling hole. The filling hole can be located at the distal or proximal end of the solid electrode according to the usage requirements.

[0052] Alternatively, the end electrode can be a solid electrode with multiple injection holes running through it. Each injection hole is connected to the main pipeline via a branch pipeline, and the injection fluid flows out through the main pipeline, the branch pipelines, and the injection holes.

[0053] In some embodiments, a plurality of ring electrodes 211 are provided around the conduit 20 at intervals, and a plurality of infusion holes 222 are provided at the distal end of the ring electrodes 211, and / or a plurality of infusion holes 223 are provided at the proximal end of the ring electrodes 211. Each infusion hole of each ring electrode 211 is connected to an infusion connector 24 through an infusion conduit.

[0054] Combination Figure 9-11 As shown, in this embodiment, a plurality of ring electrodes 211 are provided at the distal end of the conduit 20, and a plurality of infusion holes are provided on the ring electrodes 211. Specifically, a plurality of infusion holes 222 can be provided at the distal edge of the ring electrode 211, or a plurality of infusion holes 223 can be provided at the proximal edge of the ring electrode 211, or a plurality of infusion holes can be provided at both the distal and proximal edges of the ring electrode 211. When the ring electrode 211 discharges, the infusion fluid flowing out of the infusion holes at the distal edge and / or proximal edge of the ring electrode 211 can displace microbubbles.

[0055] like Figure 12 , 15As shown in Figures 16 and 17, in some embodiments, the ring electrode is a hollow electrode with a cavity 2233. The injection port 223 includes an inlet port 2231 and at least one outlet port 2232. The inlet port is located on the side of the hollow electrode that is in contact with the conduit, and each outlet port is located on the other side of the hollow electrode that is not in contact with the conduit. The inlet port 2231 is connected to the injection pipeline. The injection fluid flows into the hollow electrode through the injection pipeline and the inlet port, and flows out through each outlet port 2232 to expel air bubbles attached to the electrode.

[0056] In other embodiments, the ring electrode is a solid electrode, with a filling hole penetrating the solid electrode at a predetermined position. This filling hole is connected to a filling pipeline, through which the filling fluid flows out. The filling hole can be located at the distal or proximal end of the solid electrode, depending on the application requirements.

[0057] like Figure 18 As shown, the ring electrode can also be a solid electrode with multiple injection holes running through it. Each injection hole is connected to the main pipeline through a branch pipeline, and the injection fluid flows out through the main pipeline, the branch pipelines, and the injection holes.

[0058] In some embodiments, depending on the application scenario, the ablation catheter may only have an end electrode, which is made of metal and directly contacts the myocardial tissue for precise ablation of target points. The ablation catheter may have an end electrode and an adjacent ring electrode, using a dual-electrode discharge method to ablate one or more target points within a certain range. Alternatively, the ablation catheter may have an end electrode and multiple ring electrodes, using a dual-electrode discharge method with the end electrode and an adjacent ring electrode, or two adjacent ring electrodes, to ablate one or more target points at a specific location, depending on the location of the target point. The number of electrodes and the distance between adjacent electrodes are not specifically limited and can be flexibly configured according to the application scenario.

[0059] Considering the scenario of multi-electrode discharge, if multiple electrodes are infused with liquid through only one infusion path, uneven infusion may occur due to unstable flow rates, resulting in some electrodes dispensing liquid while others do not, or different electrodes dispensing liquid in varying amounts, thus affecting the flushing effect. Therefore, for hollow electrodes, each electrode is connected to a corresponding infusion line. The infusion liquid flows into the cavity through the inlet hole and then out through the outlet hole, ensuring uniform infusion and allowing for the use of the desired electrode for discharge and flushing as needed. For solid electrodes, each solid electrode is connected to a corresponding infusion line, with a sealed connection between the solid electrode and the conduit, and a sealed connection between the infusion line and the solid electrode. The infusion liquid flows through the solid electrode, preventing leakage and ensuring uniform liquid distribution.

[0060] In some methods, for hollow electrodes, there is only one outflow hole, with the inflow hole corresponding to the outflow hole. That is, the injection hole consists of one inflow hole and one outflow hole. Alternatively, there can be multiple outflow holes, which are equally spaced. In this case, the injection hole consists of one inflow hole and multiple outflow holes, which are equidistant from the electrode surface. The injection fluid flows out through these equally spaced outflow holes, achieving a good effect of dispersing air bubbles and preventing secondary aggregation of microbubbles.

[0061] Understandably, since the electric field strength is strongest at the electrode edge during discharge, it is preferable to provide injection holes at the electrode edge. However, injection holes can also be provided at non-edge locations, such as the middle of the electrode. The number and location of injection holes can be varied, and no specific implementation is limited.

[0062] In some embodiments, during the process of flushing air bubbles with the injection fluid, in order to avoid electrical conduction between the electrode leads and the injection fluid, which would affect normal use, it is necessary to isolate the electrode leads from the injection pipeline.

[0063] like Figure 12 , 17 As shown, for the hollow electrode, the conduit 20 includes an insulating inner tube 26 and an insulating outer tube (not shown in the figure). The hollow electrode is provided on the outer surface of the insulating inner tube 26. The hollow electrode is fixed to the insulating outer tube by a special process. The electrode lead 25 is embedded in the wall of the insulating inner tube, and the injection pipeline 23 is located in the insulating inner tube. In this way, one end of the electrode lead 25 is connected to the electrode 21, and the electrode lead 25 is arranged in the wall of the insulating inner tube 26. The other end of the electrode lead 25 is connected to the signal generator. One end of the injection pipeline 23 is connected to the injection hole 22, and the injection pipeline 23 is located in the insulating inner tube. The other end of the injection pipeline 23 is connected to the injection connector 24. This can avoid mutual interference between the injection path and the electrode circuit and prevent the injection fluid from affecting the insulation of the wire.

[0064] For solid electrodes, the injection hole passes directly through the solid electrode, and the electrode lead is isolated from the injection pipeline by sealing the connection between the solid electrode and the electrode lead.

[0065] In some embodiments, the electrode is connected to a signal generator via electrode leads, and the signal generator applies a radio frequency (RF) signal or a pulsed electric field signal to the electrode. The RF signal used for ablation primarily generates a thermal effect. When the current frequency of the RF signal reaches a certain threshold (e.g., 100 kHz), it induces the movement of charged ions within the biological tissue, generating frictional heat (60-100°C). The current frequency range for RF ablation is generally 0–2000 Hz, with an output power of 100–400 W. The pulsed electric field signal used for ablation acts on the biological tissue with a high electric field strength (1–5 kV / cm), a short pulse width (0–100 μs), and a high pulse frequency (0–2000 Hz), forming irreversible electroporation and causing cell necrosis. Compared to radio frequency signals, pulsed electric field signals can selectively ablate the myocardium while preserving related tissues such as blood vessels and nerves by configuring electrodes and adjusting the output electric field strength. For example, an electric field strength of 400V / cm can cause irreversible damage to the myocardium, an electric field strength of 1750V / cm can damage vascular smooth muscle, and an electric field strength of 3800V / cm can cause nerve damage.

[0066] In some embodiments, a magnetic sensor and a pressure sensor are installed inside the catheter, with the connecting wires of both sensors housed within the insulated inner wall of the catheter. The magnetic and pressure sensors are used to acquire position and pressure signals between the catheter and the ablation site. Based on these signals, the position of the catheter tip and the degree of contact between the tip and the ablation site can be determined. The sensor connecting wires do not interfere with the electrode leads or the perfusion pathway, thus avoiding any impact on the insulation of the wiring.

[0067] In some embodiments, the injection hole and the injection pipeline are sealed together by processes such as adhesive bonding or hot melting to prevent leakage of the injection fluid.

[0068] Optionally, the conduit 20 can be in the form of a straight tube, a ring tube, a basket, etc., and the appropriate form can be configured according to the application.

[0069] like Figure 19 , 20As shown in the illustration, the multi-electrode ablation catheter of this application embodiment is connected to a control unit. Multiple electrodes are mounted on the ablation catheter. Based on the target location determined by the diagnostic results, the control unit identifies one or more target electrodes that need to participate in the discharge for ablation of the target point. After identifying the target electrodes, the control unit controls a signal generator to apply an electrical signal to the target electrodes and simultaneously controls a perfusion pump to inject perfusion fluid into the perfusion connector corresponding to the target electrodes. Thus, during the discharge process of the target electrodes, the perfusion pump injects perfusion fluid into the perfusion pathway corresponding to the target electrodes, and the perfusion fluid flows out of the perfusion holes on the target electrodes, dispersing microbubbles attached to the target electrodes and ensuring the smooth progress of the ablation process. The control unit is connected to a three-dimensional positioning unit, which displays the catheter position, discharge parameters, etc.

[0070] In some scenarios, when using multi-electrode ablation catheters, the catheter is perfused with a fluid of isotonic pressure similar to that of the tissue before insertion into the body to purge any air from the tubing. After the catheter enters the blood vessel, to prevent thrombus formation, the control unit controls the perfusion pump to continuously and slowly perfuse the catheter with saline containing an anticoagulant (e.g., 4 mL / min). During ablation, the control unit controls the perfusion pump to increase the perfusion rate (e.g., 20 mL / min) to expel microbubbles.

[0071] This application provides a multi-electrode ablation catheter for edge perfusion. At least one electrode is mounted on the catheter, and multiple perfusion holes are provided on the electrode. These perfusion holes are connected to a perfusion connector via perfusion lines. During electrode discharge, perfusion fluid is injected through the perfusion connector. The perfusion fluid flows through the perfusion lines and out through the perfusion holes. The outflowing perfusion fluid can disperse microbubbles adhering to the electrode surface, preventing bubble aggregation and arcing. One or more perfusion holes on one electrode are connected to a single perfusion line, ensuring uniform flushing with perfusion fluid. Simultaneously, the perfusion lines are isolated from the electrode leads to prevent the perfusion fluid from affecting conductivity, ensuring stable operation. This ablation catheter has a simple structure, is easy to implement, convenient to operate, and provides stable results, making it suitable for widespread application.

[0072] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0073] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of the implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0074] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0075] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A multi-electrode ablation catheter with electrode edge perfusion comprising a catheter having at least one electrode disposed thereon, characterized in that, The electrode is provided with at least one injection hole; The infusion hole is connected to the infusion connector via the infusion pipeline inside the conduit. When the electrode discharges, the infusion fluid is injected through the infusion connector, flows out through the infusion pipeline and the infusion hole, and is used to dispel air bubbles attached to the electrode. The electrode includes an end electrode and / or a ring electrode, the end electrode and / or the ring electrode being a hollow electrode with a cavity. The infusion port includes an inlet port and at least one outlet port. The inlet port is located on the side of the hollow electrode that is in contact with the conduit, and each outlet port is located on the other side of the hollow electrode that is not in contact with the conduit. The inlet port is connected to the infusion pipeline.

2. The multi-electrode ablation catheter of claim 1, wherein, The distal end of the catheter is provided with the end electrode, and the distal end of the end electrode is provided with at least one infusion hole, and / or the proximal end of the end electrode is provided with at least one infusion hole, and each infusion hole of the end electrode is connected to the infusion connector through an infusion conduit.

3. The multi-electrode ablation catheter of claim 1, wherein, A plurality of ring electrodes are provided around the catheter at intervals. At least one infusion hole is provided at the distal end of the ring electrode, and / or at least one infusion hole is provided at the proximal end of the ring electrode. Each infusion hole of each ring electrode is connected to the infusion connector through an infusion conduit.

4. The multi-electrode ablation catheter of claim 1, wherein, The number of outflow holes is one, and the positions of the inflow holes and outflow holes correspond to each other; or, the number of outflow holes is multiple, and the multiple outflow holes are arranged at equal intervals.

5. The multi-electrode ablation catheter according to claim 1, wherein the electrode leads of the electrodes are isolated from the infusion tubing.

6. The multi-electrode ablation catheter of claim 5, wherein, The conduit includes an insulating inner tube, the electrode is provided on the outer surface of the insulating inner tube, the electrode lead is embedded in the wall of the insulating inner tube, and the infusion line is located in the insulating inner tube.

7. The multi-electrode ablation catheter of claim 1, wherein, The ablation catheter is connected to a control unit, which is used to determine one or more target electrodes that need to participate in the discharge based on the target location, control the signal generator to apply an electrical signal to the target electrode, and control the perfusion pump to inject perfusion fluid into the perfusion connector corresponding to the target electrode.

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