Ablation catheter

Abstract

The present invention proposes an ablation catheter, comprising an ablation electrode and a tube body. The ablation electrode is connected to the end of the tube body and is used to generate radio frequency current to perform radio frequency ablation treatment on the lesion site. The ablation electrode has a cavity, an injection port connected to the cavity, and a plurality of cooling holes. Cooling liquid is sprayed from the cooling holes to cool the ablation electrode; the outer surface of the ablation electrode is provided with a groove, and the groove is also provided with cooling holes. The tube body is provided with a visualization electrode for marking and displaying the shape of the tube body. According to the ablation catheter of the present invention, the effective heat dissipation area of ​​the ablation electrode is increased by providing a groove on the outer surface of the ablation electrode. Moreover, the ablation electrode is provided with a plurality of cooling holes, and cooling liquid can be sprayed through the cooling holes to cool the ablation electrode, thereby improving the cooling and heat dissipation effect of the ablation electrode. In addition, the tube body is provided with a visualization electrode, which allows the surgical operator to obtain the shape of the ablation catheter in a timely and convenient manner, thereby improving the reliability and safety of the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to an ablation catheter. Background Art

[0002] Radiofrequency catheter ablation is currently the most commonly used minimally invasive interventional technique for treating arrhythmias. Its basic principle is to deliver an RF ablation catheter through a sheath of varying lengths to the target cardiac chamber. Guided by three-dimensional mapping technology, the arrhythmia's originating lesion is precisely located. The cylindrical ablation electrode at the catheter tip is then brought into contact with the lesion with effective force. Radiofrequency current is then delivered through a loop electrode attached to the patient's skin. This current flows through the lesion's underlying tissue, generating heat within the tissue. When the temperature reaches a level that causes coagulative necrosis, the tissue permanently loses its electrical activity, effectively curing the arrhythmia.

[0003] When the ablation electrode transmits current, causing tissue heating, the electrode material's thermal conductivity and absorption properties result in passive heating due to the tissue's increased temperature. Once the electrode overheats and the surrounding blood circulation is insufficiently cooled, scabs, carbon deposits, and even detonation can easily form beneath the electrode. This increases the impedance between the electrode and tissue, affecting ablation depth and effectiveness; it can also cause complications such as embolism and perforation.

[0004] To prevent overheating of the ablation electrode, most related technologies use a one-way, circulating saline jet cooling method. This method also adjusts the cooling effect and the amount of saline injected per unit time by controlling the number of jet holes on the electrode surface. However, these related solutions suffer from the problem of requiring a large amount of cooling saline to be injected, resulting in poor cooling effectiveness.

[0005] In addition, in the related art, when the front end of the catheter is entangled, twisted, angled or reversed, the operator cannot obtain the corresponding shape of the front end of the catheter in time. Summary of the Invention

[0006] The technical problem to be solved by the present invention is how to improve the cooling effect of the ablation electrode of the ablation catheter and how to obtain the front end shape of the ablation catheter. The present invention proposes an ablation catheter.

[0007] An ablation catheter according to an embodiment of the present invention includes:

[0008] An ablation electrode, the ablation electrode is used to generate radiofrequency current to perform radiofrequency ablation treatment on the lesion site, the ablation electrode has a cavity, an injection port connected to the cavity, and a plurality of cooling holes, a cooling liquid is injected into the cavity through the injection port and ejected from the cooling holes to cool the ablation electrode; the outer surface of the ablation electrode is provided with the cooling holes and a groove, wherein the cooling hole is also provided in the groove;

[0009] The tube body, the ablation electrode is connected to the end of the tube body, and the tube body is provided with a visualization electrode for marking and displaying the shape of the tube body.

[0010] According to the ablation catheter of an embodiment of the present invention, a groove is provided on the outer surface of the ablation electrode at the head end of the tube body, which can increase the outer surface area of ​​the ablation electrode without increasing the volume of the ablation electrode, thereby increasing the effective heat dissipation area of ​​the ablation electrode and improving the heat dissipation and cooling effect of the ablation electrode. Moreover, the outer surface of the ablation electrode includes a plurality of cooling holes provided in the groove, and coolant can be sprayed through the cooling holes to cool the ablation electrode, thereby further improving the cooling and heat dissipation effect of the ablation electrode. In addition, the tube body is provided with a visual electrode, which allows the surgical operator to obtain the shape of the ablation catheter in a timely and convenient manner, facilitating the surgical operator to monitor and control the shape of the ablation catheter, thereby improving the reliability and safety of the operation.

[0011] According to some embodiments of the present invention, there are multiple visualization electrodes, all of which are located at one end of the tube body close to the ablation electrode, and are spaced apart along the axial direction of the tube body.

[0012] In some embodiments of the present invention, the distance between any two adjacent visualization electrodes is not less than 1 cm.

[0013] According to some embodiments of the present invention, the distance between the visualization electrode closest to the ablation electrode and the ablation electrode ranges from 3 cm to 7 cm.

[0014] In some embodiments of the present invention, the ablation electrode is columnar, the groove is provided on the side surface of the ablation electrode, and the groove is an annular groove provided along the circumferential direction of the ablation electrode.

[0015] According to some embodiments of the present invention, a plurality of annular grooves are provided at intervals along the axial direction of the ablation electrode.

[0016] In some embodiments of the present invention, the cooling hole comprises:

[0017] A spray cooling hole, wherein the spray cooling hole is located in the groove, and the coolant in the chamber is sprayed out in a mist form through the spray cooling hole;

[0018] A jet cooling hole is located on the side surface of the ablation electrode except the groove, and the cooling liquid in the chamber is ejected in a ray-like manner through the jet cooling hole.

[0019] According to some embodiments of the present invention, both the spray cooling holes and the jet cooling holes are multiple and evenly spaced along the circumferential direction of the ablation electrode, and the aperture of the spray cooling hole is smaller than the aperture of the jet cooling hole.

[0020] In some embodiments of the present invention, a top wall and side walls of the ablation electrode are each provided with a plurality of temperature sensors for detecting the temperature of the ablation electrode.

[0021] According to some embodiments of the present invention, the ablation catheter further comprises: a circulation tube, wherein the circulation tube is connected to the injection port and is used to inject cooling liquid into the chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an ablation electrode according to an embodiment of the present invention;

[0023] Figure 2 is a partial structural cross-sectional view of an ablation electrode according to an embodiment of the present invention;

[0024] Figure 3 is a top view of an ablation electrode according to an embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of an ablation catheter according to an embodiment of the present invention;

[0026] Figure 5 is an axial cross-sectional view of a local structure of an ablation catheter according to an embodiment of the present invention;

[0027] Figure 6 is a transverse cross-sectional view of an ablation catheter according to an embodiment of the present invention;

[0028] Figure 7 An exploded view of a local structure of an ablation catheter according to an embodiment of the present invention;

[0029] Figure 8 FIG. 4 is a schematic diagram of a partial structure of an ablation catheter according to an embodiment of the present invention.

[0030] Reference numerals:

[0031] ablation catheter 100,

[0032] Ablation electrode 10, chamber V1, injection port 110, cooling hole 120, spray cooling hole 121, jet cooling hole 122, groove 130, temperature sensor 140,

[0033] Tube 20, first navigation magnet 310, second navigation magnet 320, third navigation magnet 330, distal positioning chip 410, proximal positioning chip 420, circulation tube 70, tail line 90,

[0034] A first ring electrode 101 , a second ring electrode 102 , a third ring electrode 103 , a visualization electrode 106 , and a wire 107 . DETAILED DESCRIPTION

[0035] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0036] In the related art, saline irrigation is used to cool the radiofrequency ablation catheter, but the disadvantages are:

[0037] Limited by the lateral area of ​​the cylindrical ablation electrode at the catheter tip, cooling efficiency remains low despite increasing the number of holes for external saline spraying. Given a certain lateral area of ​​the cylindrical ablation electrode, the saline infusion rate must be increased to achieve a better cooling effect. The current infusion rate for a 12-hole radiofrequency ablation catheter is 17ml / min, and for a 56-hole radiofrequency ablation catheter is 8ml / min. Thus, a three-hour surgical procedure requires the infusion of 1000-3000ml of saline. This significantly increases the patient's cardiac burden and poses a risk of inducing heart failure.

[0038] In view of the above-mentioned defects of ablation catheters in related art, the present invention proposes an ablation catheter 100 . The ablation catheter 100 includes an ablation electrode 10 and a tube body 20 .

[0039] The ablation electrode 10 is used to generate radio frequency current to perform radio frequency ablation treatment on the lesion. Figure 1 and Figure 2 As shown, the ablation electrode 10 has a cavity V1, an injection port 110 communicating with the cavity V1, and a plurality of cooling holes 120. Coolant is injected into the cavity V1 through the injection port 110 and ejected from the cooling holes 120 to cool the ablation electrode 10. The outer surface of the ablation electrode 10 is provided with cooling holes 120 and grooves 130, wherein the grooves 130 are also provided with cooling holes 120.

[0040] According to some embodiments of the present invention, Figure 1 and Figure 2 As shown, the ablation electrode 10 is cylindrical, and a groove 130 is provided on the side surface of the ablation electrode 10. The groove 130 is an annular groove 130 arranged along the circumference of the ablation electrode 10. It should be noted that by providing the circumferential annular groove 130 on the outer surface of the ablation electrode 10, the processing and manufacturing of the groove 130 is facilitated, thereby reducing the production cost of the ablation electrode 10. Moreover, the area of ​​the groove 130 can be increased, thereby improving the cooling and heat dissipation effect of the ablation electrode 10.

[0041] In some embodiments of the present invention, a plurality of annular grooves 130 are provided at intervals along the axial direction of the ablation electrode 10. It is understood that by providing a plurality of annular grooves 130, the effective heat dissipation area of ​​the ablation electrode 10 can be further increased, thereby further improving the cooling and heat dissipation effect of the ablation electrode 10.

[0042] According to some embodiments of the present invention, Figure 1 As shown, the cooling holes 120 include spray cooling holes 121 and jet cooling holes 122 .

[0043] The spray cooling holes 121 are located within the groove 130, and the coolant in the chamber V1 is sprayed out in a mist-like manner through the spray cooling holes 121. The jet cooling holes 122 are located on the side surface of the ablation electrode 10, excluding the groove 130, and the coolant in the chamber V1 is sprayed out in a radial pattern through the jet cooling holes 122.

[0044] It should be noted that when the ablation electrode 10 is cooled, the cooling liquid in the chamber V1 can be sprayed out in a mist form from the spray cooling hole 121 to increase the spray range of the cooling liquid and improve the cooling effect; the cooling liquid in the chamber V1 can also be sprayed out in a ray-like form through the jet cooling hole 122 to drive the surrounding blood flow and accelerate the cooling and heat dissipation efficiency of the ablation electrode 10.

[0045] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the spray cooling holes 121 and the jet cooling holes 122 can be arranged in a plurality of evenly spaced locations along the circumferential direction of the ablation electrode 10. This can improve the uniformity of the coolant spray and thus improve the uniformity of the heat dissipation of the ablation electrode 10. The aperture of the spray cooling hole 121 and the cooling hole 120 is smaller than the aperture of the jet cooling hole 122. For example, the aperture of the spray cooling hole 121 can be less than 50 μm, and the aperture of the jet cooling hole 122 can be less than 100 μm.

[0046] According to some embodiments of the present invention, Figure 3 As shown, the top wall and side walls of the ablation electrode 10 are each provided with a plurality of temperature sensors 140 for detecting the temperature of the ablation electrode 10. Thus, the temperature of each part of the ablation electrode 10 can be acquired in real time, so that when the temperature reaches a preset value, the ablation electrode 10 is cooled by spraying coolant.

[0047] The ablation electrode 10 is connected to the end of the tube 20. Figure 4 、 Figure 5 and Figure 7 As shown, the tube body 20 is provided with a visualization electrode 106 for marking and displaying the shape of the tube body 20 .

[0048] It should be noted that by providing the visualization electrode 106 on the tube body 20, the shape of the tube body 20 near the end of the ablation electrode 10 can be displayed on the display module in conjunction with a three-dimensional coordinate device. Therefore, when the front end of the ablation catheter 100 is entangled, twisted, angled, or reversed, the operator can promptly obtain the corresponding shape of the ablation catheter 100 and make corresponding adjustments to the ablation catheter 100.

[0049] According to the ablation catheter 100 of the embodiment of the present invention, a groove 130 is provided on the outer surface of the ablation electrode 10 at the head end of the tube body 20, which can increase the outer surface area of ​​the ablation electrode 10 without increasing the volume of the ablation electrode 10, thereby increasing the effective heat dissipation area of ​​the ablation electrode 10 and improving the heat dissipation and cooling effect of the ablation electrode 10. Moreover, the outer surface of the ablation electrode 10 includes a plurality of cooling holes 120 provided in the groove 130, and the cooling liquid can be sprayed through the cooling holes 120 to cool the ablation electrode 10, thereby further improving the cooling and heat dissipation effect of the ablation electrode 10. In addition, the tube body 20 is provided with a visualization electrode 106, which can allow the surgical operator to obtain the shape of the ablation catheter 100 in a timely and convenient manner, facilitating the surgical operator to monitor and control the shape of the ablation catheter 100, thereby improving the reliability and safety of the operation.

[0050] According to some embodiments of the present invention, Figure 4 、 Figure 5 and Figure 7 As shown, there can be multiple visualization electrodes 106 , all of which are located at one end of the tube body 20 close to the ablation electrode 10 , and the multiple visualization electrodes are spaced apart along the axial direction of the tube body 20 .

[0051] It can be understood that by setting multiple visualization electrodes 106 at intervals near the position of the ablation electrode 10, a more accurate shape of the front end of the ablation catheter 100 can be obtained by using multiple visualization electrodes 106 in conjunction with three-dimensional mapping equipment, so as to facilitate the surgical operator to monitor and adjust the shape of the ablation catheter 100.

[0052] In some embodiments of the present invention, the distance between any two adjacent visualization electrodes 106 is no less than 1 cm. It will be appreciated that the smaller the distance between two adjacent visualization electrodes 106, the smaller the length of the tube body 20 that can be captured and displayed by the two adjacent visualization electrodes 106, which is not conducive to observing the overall shape of the ablation catheter 100. When the distance between two adjacent visualization electrodes 106 is set to no less than 1 cm, the shape of the ablation catheter 100 can be conveniently and reliably captured.

[0053] According to some embodiments of the present invention, the distance between the visualization electrode 106 closest to the ablation electrode 10 and the ablation electrode 10 ranges from 3 cm to 7 cm. It should be noted that if the distance between the visualization electrode 106 and the ablation electrode 10 is set too small, interference and heat conduction between the visualization electrode 106 and the ablation electrode 10 are likely to occur; and if the distance between the visualization electrode 106 and the ablation electrode 10 is set too large, the morphology of the ablation catheter 100 near the front end of the ablation electrode 10 cannot be effectively acquired. Experimental verification has shown that when the distance between the visualization electrode 106 closest to the ablation electrode 10 and the ablation electrode 10 is set to 3 cm to 7 cm, the interference between the visualization electrode 106 and the ablation electrode 10 can be effectively avoided, and the morphology of the front end of the ablation catheter 100 can be conveniently and reliably acquired. For example, the distance between the visualization electrode 106 closest to the ablation electrode 10 and the ablation electrode 10 can be set to 5 cm.

[0054] The ablation catheter 100 according to the present invention will be described in detail below with reference to the accompanying drawings using a specific embodiment. It should be understood that the following description is merely exemplary and does not specifically limit the present invention.

[0055] like Figure 4-Figure 7 As shown, the ablation catheter 100 includes: a tube body 20 , an ablation electrode 10 , a flow tube 70 , a guide wire 107 and a tail wire 90 .

[0056] The ablation electrode 10 is a cylindrical electrode located at the tip of the tubular body 20 and is used to deliver radiofrequency current for ablation. The ablation electrode 10 can spray cooling saline for self-cooling. The diameter of the ablation electrode 10 can be 6F (2.00mm), 8F (2.67mm), 10F (3.34mm), or 12F (4.00mm), allowing the surgeon to choose the diameter based on the intended use.

[0057] The ablation electrode 10 comprises a cavity V1, an injection port 110 communicating with the cavity V1, and multiple cooling holes 120. The ablation electrode 10 is equipped with a temperature sensor matrix, including at least three temperature sensors 140 located on the top wall of the cavity V1 and at least two temperature sensors 140 located on the inner wall of the cavity V1. These sensors are used to sense temperature changes at the tip of the ablation electrode 10 during the ablation process. By automatically monitoring the temperature of the ablation electrode 10, the surgeon can increase ablation energy, reduce ablation time, and improve ablation efficiency.

[0058] The side surface of the ablation electrode 10 is provided with a plurality of annular grooves 130 spaced apart along its axial direction. The grooves 130 have a depth of more than 0.5 mm and a width of more than 0.5 mm, and are used to increase the heat dissipation capacity of the surface of the ablation electrode 10 .

[0059] Multiple spray cooling holes 121 with a diameter of less than 50 μm are evenly distributed in the groove 130 and are used to spray cooling saline in a cloud-like manner onto the surface of the ablation electrode 10 and form a circulating cooling with the blood around the ablation electrode 10 to enhance the unidirectional circulating cooling effect.

[0060] The cooling saline injection port 110 is located at the rear end of the ablation electrode 10 and connects to the chamber V1 of the ablation electrode 10. It is used to deliver cooling saline into the ablation electrode 10. The number (more than 120) and distribution of cooling holes 120 are coordinated, and cooling saline is injected into the chamber V1 at a flow rate of less than 5 ml / min to ensure a cooling effect on the ablation electrode 10.

[0061] The side of the ablation electrode 10, excluding the groove 130, is equipped with jet cooling holes 122 with a diameter of less than 100 μm. These holes are regularly distributed across the surface of the ablation electrode 10. These holes are arranged in a clockwise, oblique pattern and are used to spray cooling saline into the surrounding blood, creating a circulating cooling loop with the blood surrounding the ablation electrode 10.

[0062] like Figure 4 and Figure 5 As shown, the tube body 20 is equipped with a distal positioning chip 410 and a proximal positioning chip 420 for three-dimensional positioning of the ablation catheter 100 tip. The distal positioning electrode 410 is approximately 102 mm from the ablation electrode. A first navigation magnet 310, a second navigation magnet 320, and a third navigation magnet 330 are located within the tube body 20 to drive the ablation catheter 100 tip to change direction and move within the magnetic field. The first navigation magnet 310 is approximately 2 mm from the ablation electrode.

[0063] A visualization electrode 106 is provided at one end of the tube body 20 close to the ablation electrode 10 to ensure that the operator can accurately determine whether the front end of the ablation catheter 100 is entangled, twisted, angled, reversed, etc. on the three-dimensional mapping map.

[0064] There are multiple visualization electrodes 106, which are spaced apart along the axial direction of the tube body 20. Starting from 5 cm from the head end of the ablation catheter 100, more than one three-dimensional visualization electrode 106 is set at a distance of more than 1 cm to display the shape of the tube body 20 at the head end of the ablation catheter 100 on the three-dimensional mapping map.

[0065] like Figure 4 、 Figure 5 and Figure 7As shown, the tube body 20 is provided with a first ring electrode 101, a second ring electrode 102, and a third ring electrode 103. The first ring electrode 101 is located approximately 2 mm from the tip of the tube body 20. The width of the first ring electrode 101 is within 2 mm, and the thickness is within 0.3 mm. The first ring electrode 101 cooperates with the ablation electrode 10 to record the bipolar potential at the distal end of the ablation catheter 100.

[0066] The second and third ring electrodes 102, 103 are located at the tip of the catheter body 20, forming a proximal electrode pair. The width of each ring electrode 102, 103 is less than 2 mm, and the thickness is less than 0.3 mm. The spacing between the second and third ring electrodes 102, 103 is less than 5 mm. They are used to record bipolar potentials at the proximal end of the ablation catheter 100.

[0067] The tube body 20 includes a flexible tube body section, which is located between the ablation electrode 10 and the first ring electrode 101 and is used to control the lateral deformation of the tip of the ablation catheter 100 .

[0068] like Figure 8 As shown, the tail portion of the ablation catheter 100 is provided with a tail wire 90 for connecting to a host.

[0069] The workflow and principle of the ablation catheter 100 of the present invention are as follows:

[0070] S1, connect the tail line 90 of the ablation catheter 100, connect the saline irrigation tube connector, and fully exhaust the convection tube 70.

[0071] S2, the tip of the ablation catheter 100 is delivered into the predetermined cardiac cavity through the pre-placed long sheath.

[0072] S3, balancing the contact pressure zero point, and displaying the contact vector arrows of the ablation catheter 100 body and the ablation catheter 100 tip on the predetermined three-dimensional image of the cardiac cavity.

[0073] S4, confirming that the size and direction of the contact vector of the tip of the ablation catheter 100 are within a preset safety range.

[0074] S5: Send a command to the ablation catheter 100 through the control interface, and advance the catheter so that the ablation electrode 10 contacts the endocardial tissue. The contact quality is determined by the pressure contact force inspection function of the ablation catheter 100 tip.

[0075] S6, the host comprehensively calculates the size and direction of the contact force and displays the contact force and its mass in the form of a vector arrow at the tip of the ablation catheter 100 and a screen display window.

[0076] S7, the operator sets the ablation parameters and cooling pump parameters.

[0077] S8 , the operator completely adjusts the positioning and contact quality of the ablation electrode 10 at the tip of the ablation catheter 100 through the catheter manipulator according to the vector parameters of the tip of the ablation catheter 100 .

[0078] S9: When radiofrequency is delivered, the spray cooling holes 121 within the groove 130 of the ablation electrode 10 spray a mist of water to cool the tube 20. The jet cooling holes 122 on the sidewall of the ablation electrode 10 spray saline, which, along with the blood surrounding the ablation electrode 10, completes a circulating cooling process. The grooves 122 on the surface of the ablation electrode 10 increase the effective heat dissipation area, enhance the cooling effect, and reduce the amount of saline perfusion.

[0079] The ablation electrode 10 and ablation catheter 100 proposed by the present invention solve the following problems:

[0080] 1. Under the premise of keeping the side area of ​​the cylindrical ablation electrode 10 at the catheter head end unchanged, the heat dissipation area is increased and the heat dissipation efficiency is improved.

[0081] 2. Jet holes of different diameters are made on the side of the columnar ablation electrode 10 to cool the area near the ablation electrode 10 with mist-like saline and to cool the area around the ablation electrode 10 with jet-flushing saline.

[0082] 3. Increase the number of apertures on the side of the columnar ablation electrode 10 to more than 120, and reduce the diameter of a single aperture by more than 50%, so as to reduce the amount of saline input by more than 50% without reducing the existing cooling efficiency.

[0083] 4. Designing ablation catheters 100 with different ablation electrode 10 diameters and matching cooling holes 120 increases the operator's selectivity for different patients, different body parts, and different ablation efficiencies.

[0084] 5. A visualization electrode is provided on the tube body 20 for obtaining the tube body shape of the tip end of the ablation catheter 100 .

[0085] In summary, the ablation catheter 100 proposed in the present invention has the following advantages:

[0086] An annular groove 130 is formed on the side of the ablation electrode 10 to increase the heat dissipation area. Cooling holes 120 of varying diameters are also formed on the side of the ablation electrode 10, providing cloud-like saline cooling to the area adjacent to the ablation electrode 10 and jet-flushing saline cooling around the ablation electrode, respectively, improving heat dissipation efficiency. The number of apertures on the side of the ablation electrode 10 has been increased to over 120, reducing the diameter of each individual aperture by over 50%, thereby reducing saline input by over 50% without compromising cooling efficiency. The ablation catheter 100 and ablation electrode 10 are available in various diameters: 6F (2.00mm), 8F (2.67mm), 10F (3.34mm), and 12F (4.00mm), increasing the operator's choice of ablation size for different patients, different areas, and different ablation efficiencies. Furthermore, the tube body 20 is equipped with a visualization electrode, allowing the operator to quickly and conveniently monitor the ablation catheter 100's morphology, facilitating monitoring and control of the catheter's morphology, thereby improving the reliability and safety of the procedure.

[0087] Through the description of the specific implementation methods, a deeper and more specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose should be obtained. However, the accompanying drawings are only for reference and illustration purposes and are not intended to limit the present invention.

Claims

1. An ablation catheter, characterized in that: include: An ablation electrode, the ablation electrode is used to generate radiofrequency current to perform radiofrequency ablation treatment on the lesion site, the ablation electrode has a cavity, an injection port connected to the cavity, and a plurality of cooling holes, a cooling liquid is injected into the cavity through the injection port and ejected from the cooling holes to cool the ablation electrode; the outer surface of the ablation electrode is provided with the cooling holes and a groove, wherein the cooling hole is also provided in the groove; The tube body, the ablation electrode is connected to the end of the tube body, and the tube body is provided with a visualization electrode for mapping and displaying the shape of the tube body; The cooling hole comprises: A spray cooling hole, located in the groove and having a diameter of less than 50 μm, through which the coolant in the chamber is sprayed in a mist-like manner, is used to spray cooling saline in a cloud-like manner onto the surface of the ablation electrode; A jet cooling hole, located on the side surface of the ablation electrode excluding the groove, with a diameter of less than 100 μm, through which the coolant in the chamber is ejected in a radial pattern, for injecting cooling saline into the surrounding blood; The top wall and side walls of the ablation electrode are both provided with a plurality of temperature sensors for detecting the temperature of the ablation electrode.

2. The ablation catheter according to claim 1, characterized in that There are multiple visualization electrodes, all of which are located at one end of the tube body close to the ablation electrode, and are spaced apart along the axial direction of the tube body.

3. The ablation catheter according to claim 2, characterized in that The distance between any two adjacent visualization electrodes is not less than 1 cm.

4. The ablation catheter according to claim 2, characterized in that The distance between the visualization electrode closest to the ablation electrode and the ablation electrode ranges from 3 cm to 7 cm.

5. The ablation catheter according to claim 1, characterized in that The ablation electrode is columnar, the groove is provided on the side surface of the ablation electrode, and the groove is an annular groove provided along the circumferential direction of the ablation electrode.

6. The ablation catheter according to claim 5, characterized in that A plurality of annular grooves are arranged at intervals along the axial direction of the ablation electrode.

7. The ablation catheter according to claim 1, characterized in that The spray cooling holes and the jet cooling holes are both arranged in a plurality and evenly spaced along the circumferential direction of the ablation electrode. The aperture of the spray cooling hole is smaller than the aperture of the jet cooling hole.

8. The ablation catheter according to any one of claims 1 to 7, characterized in that: The ablation catheter further includes a circulation tube, which is connected to the injection port and is used to inject cooling liquid into the cavity.

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