An ablation device

Abstract

This invention relates to an ablation device, comprising a handle; a catheter with a proximal end connected to the handle and a distal end forming a flexible ablation segment suitable for insertion into a patient's body cavity through a body channel, the ablation segment having a first working section and a second working section in a working state; multiple electrodes disposed on the ablation segment; an energy generator for providing ablation energy to the electrodes; and a blocking member disposed on the ablation segment to prevent the two working sections from abutting each other, ensuring that the distance between the electrodes located on the two working sections is greater than a predetermined distance. The blocking member of the ablation device can also be used to increase the electrical clearance between adjacent electrodes. This invention, by providing a blocking member on the ablation segment, can create a certain space around the catheter, preventing adjacent first and second working sections of the catheter's ablation segment from abutting each other, maintaining the shape and structure of the ablation segment, avoiding arcing between electrodes, ensuring smooth operation, and patient safety.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to an ablation device. Background Technology

[0002] Atrial fibrillation (AF) is a heart condition in which one or both atria beat abnormally. If left untreated, AF can lead to numerous adverse consequences, including palpitations, shortness of breath, weakness, and generally poor blood flow throughout the body. Ablation catheters are a common treatment for AF, including radiofrequency ablation, cryoablation, and pulsed ablation. For paroxysmal AF, pulmonary vein isolation (PVI) is the most frequently used method, blocking erroneous or abnormal electrical signals by causing damage around the pulmonary veins. For persistent AF, the "stepwise" ablation strategy is commonly used in China, involving bilateral pulmonary vein vestibular electrical isolation and ablation along the apical line, mitral isthmus line, and tricuspid isthmus line. This procedure is relatively fixed and simple to perform. Existing techniques for treating arrhythmias include radiofrequency, laser, microwave, and cryoablation. However, these ablation techniques often fail to achieve transmural ablation, affecting treatment efficacy. Furthermore, they lack cell selectivity, thus inadvertently destroying non-target cells.

[0003] Given the shortcomings of the above-mentioned thermal ablation techniques, high-voltage pulse ablation technology is a novel ablation method that uses a high-voltage electric field as energy. It is a non-thermal ablation technique with tissue selectivity and does not have high requirements for electrode contact with tissue. By designing an appropriate pulse electric field, multiple high-voltage pulses are released in a short time to provide the energy for ablation.

[0004] like Figure 1 As shown, in order to improve ablation efficiency, existing ablation catheters are mostly multi-electrode structures such as rings, baskets, and spheres. Their axial and radial directions may have adjacent ring segments with overlapping parts, which may be inner and outer rings in the radial direction or front and back rings in the axial direction. However, due to the influence of forces inside and outside the heart chamber, the shape of electrode 91 may be deformed, causing the shape of catheter 92 to change, or the shape of catheter 92 may be actively controlled to change the ring structure. This may lead to short circuits between adjacent ring segments (as shown in the circled part in the figure) and generate electric arcs, which may harm the patient. Summary of the Invention

[0005] The purpose of this invention is to provide an ablation device for preventing the generation of electric arcs between electrodes on adjacent working sections.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An ablation device, comprising

[0008] handle;

[0009] A catheter extending along its length, the proximal end of which is connected to the handle, and the distal end of which forms a flexible ablation segment adapted to be inserted through a body passage into a patient's body cavity, the ablation segment having at least two working sections in the working state, wherein the two working sections are a first working section and a second working section, respectively.

[0010] The electrode is provided in a plurality of manners, and the plurality of the electrodes are disposed on the ablation segment;

[0011] Energy generator: used to provide ablation energy to the electrodes on the first and second working sections during operation;

[0012] The ablation device further includes a blocking member disposed on the ablation section. The blocking member is used to prevent the first working section and the second working section of the ablation section from touching each other, so that the distance between the electrode located on the first working section and the electrode located on the second working section is greater than a set distance, and the set distance is greater than zero.

[0013] Preferably, the blocking element includes a magnetic element, and multiple magnetic elements are provided. The multiple magnetic elements are distributed along the length direction of the ablation segment, and the polarity of the end of each magnetic element facing the radially outer side of the catheter is the same.

[0014] More preferably, the magnetic element is disposed inside the ablation section.

[0015] More preferably, the magnetic element is disposed on the inner surface of the ablation section and is located directly below the electrode.

[0016] More preferably, the magnetic element is disposed on the outer surface of the ablation section, and the magnetic element is located between two adjacent electrodes.

[0017] More preferably, the magnetic element is ring-shaped, and the ring-shaped magnetic element is coaxially arranged with the conduit to ensure uniform polarity and magnetic force in all directions.

[0018] More preferably, the magnetic component is made of hard magnetic material and / or soft magnetic material.

[0019] More preferably, the soft magnetic material includes metallic soft magnetic material, ferrite soft magnetic material, and magnetic medium, and the hard magnetic material includes ferrite, samarium cobalt, alnico, and rubidium iron boron.

[0020] Preferably, the blocking element includes a blocking balloon connected to the outer surface of the ablation section and located between two adjacent electrodes. The blocking balloon has a protruding state and is in a convex state. The blocking balloon protrudes from the outer surface of the ablation section, thereby preventing the electrodes on the first and second working sections from getting too close and generating an electric arc, while forming a barrier between adjacent electrodes on the same working section to increase the electrical clearance.

[0021] More preferably, the blocking balloon is provided only on the first working section; or only on the second working section; or the blocking balloon is provided on both the first and second working sections. The blocking balloons can be positioned in various combinations in the first and second working sections, but it must be ensured that the first and second working sections can be prevented from getting close to each other.

[0022] More preferably, the blocking balloons on the first working segment and the second working segment are arranged alternately to avoid the blocking balloons on the first working segment and the second working segment overlapping and causing the distance between the electrodes to be too far.

[0023] More preferably, the blocking balloon, in its protruding state, rests between two adjacent electrodes on the first or second working segment to avoid affecting the electrode's discharge ablation.

[0024] More preferably, the distance by which the blocking balloon protrudes from the outer surface of the ablation segment is 0.1 mm to 1 cm.

[0025] More preferably, the distance by which the blocking balloon protrudes from the outer surface of the ablation section is 0.1mm-3mm.

[0026] More preferably, the blocking balloon includes a first balloon. When the first balloon is in a convex state, the first balloon protrudes radially from all sides of the ablation segment, which is suitable for various structures where the ablation segment is bent, and can form a stable support.

[0027] More preferably, the first balloon protrudes equally from all four radial directions of the ablation segment, or

[0028] The distance by which the first balloon protrudes from the side of the ablation segment intended to adhere to human tissue is less than the distance by which the first balloon protrudes from the ablation segment in other directions.

[0029] More preferably, the blocking balloon includes a second balloon. When the second balloon is in a protruding state, the second balloon protrudes only from one radial side of the ablation segment, which is the side facing the first working segment or the second working segment, resulting in a simple and stable structure.

[0030] More preferably, the blocking balloon also has a contracted state, in which the blocking balloon contracts onto the outer surface of the ablation segment.

[0031] More preferably, the catheter has an inflatable channel inside, which is connected to the blocking balloon. The blocking balloon is filled with a medium through the inflatable channel, causing the blocking balloon to switch from a contracted state to a protruding state.

[0032] More preferably, the catheter has only one lumen inside, which forms the filling channel; or

[0033] The catheter has multiple lumens inside, and at least one of the lumens forms the filling channel.

[0034] More preferably, the material of the blocking balloon is a compliant material and / or a semi-compliant material.

[0035] More preferably, the compliant material includes silicone or PU, and the semi-compliant material includes nylon or Pebax.

[0036] Preferably, the ablation segment is bent into a ring shape in a working state, and the first working segment and the second working segment are adjacent to each other in the axial and / or radial direction of the ring formed by the ablation segment.

[0037] The purpose of this invention is to provide an ablation device for preventing the generation of electric arcs between electrodes on adjacent working sections and between adjacent electrodes.

[0038] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0039] An ablation device, comprising

[0040] handle;

[0041] A catheter extending along its length, the proximal end of which is connected to the handle, and the distal end of which forms a flexible ablation segment adapted to be inserted through a body passage into a patient's body cavity, the ablation segment having at least two working sections in the working state, wherein the two working sections are a first working section and a second working section, respectively.

[0042] The electrode is provided in a plurality of manners, and the plurality of the electrodes are disposed on the ablation segment;

[0043] Energy generator: used to provide ablation energy to the electrodes;

[0044] The ablation device further includes a blocking member disposed on the ablation section. The height of the blocking member in the radial direction of the ablation section is higher than the height of the electrode in the radial direction of the ablation section. The blocking member can be used to prevent the first working section and the second working section of the ablation section from touching each other, thereby making the distance between the electrode located on the first working section and the electrode on the second working section greater than a set distance, and the set distance is greater than zero, and can be used to increase the electrical clearance between adjacent electrodes.

[0045] Preferably, the blocking element includes a blocking balloon connected to the outer surface of the ablation section and located between two adjacent electrodes. The blocking balloon has a protruding state and is in a convex state. The blocking balloon protrudes from the outer surface of the ablation section, thereby preventing the electrodes on the first and second working sections from getting too close and generating an electric arc, while forming a barrier between adjacent electrodes on the same working section to increase the electrical clearance.

[0046] More preferably, the blocking balloon is provided only on the first working section; or only on the second working section; or the blocking balloon is provided on both the first and second working sections. The blocking balloons can be positioned in various combinations in the first and second working sections, but it must be ensured that the first and second working sections can be prevented from getting close to each other.

[0047] More preferably, the blocking balloons on the first working segment and the second working segment are arranged alternately to avoid the blocking balloons on the first working segment and the second working segment overlapping and causing the distance between the electrodes to be too far.

[0048] More preferably, the blocking balloon, in its protruding state, rests between two adjacent electrodes on the first or second working segment to avoid affecting the electrode's discharge ablation.

[0049] More preferably, the distance by which the blocking balloon protrudes from the outer surface of the ablation segment is 0.1 mm to 1 cm.

[0050] More preferably, the distance by which the blocking balloon protrudes from the outer surface of the ablation section is 0.1mm-3mm.

[0051] More preferably, the blocking balloon includes a first balloon. When the first balloon is in a convex state, the first balloon protrudes radially from all sides of the ablation segment, which is suitable for various structures where the ablation segment is bent, and can form a stable support.

[0052] More preferably, the first balloon protrudes equally from all four radial directions of the ablation segment, or

[0053] The distance by which the first balloon protrudes from the side of the ablation segment intended to adhere to human tissue is less than the distance by which the first balloon protrudes from the ablation segment in other directions.

[0054] More preferably, the blocking balloon includes a second balloon. When the second balloon is in a protruding state, the second balloon protrudes only from one radial side of the ablation segment, which is the side facing the first working segment or the second working segment, resulting in a simple and stable structure.

[0055] More preferably, the blocking balloon also has a contracted state, in which the blocking balloon contracts onto the outer surface of the ablation segment.

[0056] More preferably, the catheter has an inflatable channel inside, which is connected to the blocking balloon. The blocking balloon is filled with a medium through the inflatable channel, causing the blocking balloon to switch from a contracted state to a protruding state.

[0057] More preferably, the catheter has only one lumen inside, which forms the filling channel; or

[0058] The catheter has multiple lumens inside, and at least one of the lumens forms the filling channel.

[0059] More preferably, the material of the blocking balloon is a compliant material and / or a semi-compliant material.

[0060] More preferably, the compliant material includes silicone or PU, and the semi-compliant material includes nylon or Pebax.

[0061] Preferably, the ablation segment is bent into a ring shape in a working state, and the first working segment and the second working segment are adjacent to each other in the axial and / or radial direction of the ring formed by the ablation segment.

[0062] Preferably, the first working segment and the second working segment are adjacent in the axial and / or radial direction of the annulus formed by the ablation segment, and have a coincident angle about the axis of the annulus formed by the ablation segment.

[0063] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0064] This invention incorporates a blocking element on the ablation segment to create a certain space around the catheter, preventing adjacent first and second working segments of the catheter ablation segment from coming into contact with each other, maintaining the shape and structure of the ablation segment, avoiding electric arcs generated by discharge between electrodes, ensuring the smooth progress of the surgery and the safety of the patient. Attached Figure Description

[0065] Appendix Figure 1This is a schematic diagram of the structure of an ablation device in the prior art;

[0066] Appendix Figure 2 This is a schematic diagram of the ablation device in this embodiment when the blocking element is the first balloon;

[0067] Appendix Figure 3 This is an enlarged schematic diagram of the ablation segment when the first balloon is inflated in this embodiment;

[0068] Appendix Figure 4 This is an enlarged schematic diagram of the ablation segment when the first balloon is in a contracted state in this embodiment;

[0069] Appendix Figure 5 This is an enlarged axial cross-sectional view of the connection between the first balloon and the ablation segment (shown as a single-lumen tube) in this embodiment;

[0070] Appendix Figure 6 This is a schematic diagram of the ablation device when the blocking element is a second balloon in this embodiment;

[0071] Appendix Figure 7 This is an enlarged schematic diagram of the ablation segment when the second balloon is inflated in this embodiment;

[0072] Appendix Figure 8 This is an enlarged schematic diagram of the ablation segment when the second balloon is in a contracted state in this embodiment;

[0073] Appendix Figure 9 This is an enlarged axial cross-sectional view of the connection between the second balloon and the ablation segment (shown as a single-lumen tube) in this embodiment;

[0074] Appendix Figure 10 This is an enlarged cross-sectional view of the catheter when the blocking element is a blocking balloon (shown as the first balloon) and a single-lumen tube is used in this embodiment;

[0075] Appendix Figure 11 This is an enlarged cross-sectional view of the catheter when the blocking element is a blocking balloon (shown as the first balloon) and a multi-lumen tube is used in this embodiment;

[0076] Appendix Figure 12 This is a schematic diagram illustrating the action of the blocking balloon on human tissue in this embodiment.

[0077] Appendix Figure 13 This is a schematic diagram of the ablation device in this embodiment where the blocking element is a magnetic element and located outside the catheter;

[0078] Appendix Figure 14 This is an enlarged radial cross-section diagram of the conduit when the blocking element is a magnetic element and a single-lumen tube is used in this embodiment;

[0079] Appendix Figure 15This is an enlarged radial cross-section diagram of the conduit when the blocking element is a magnetic element and a multi-lumen tube is used in this embodiment;

[0080] In the attached diagrams above:

[0081] 1. Handle; 2. Catheter; 21. Ablation section; 211. First working section; 212. Second working section; 22. Pull wire cavity; 23. Shaping wire cavity; 24. Lead wire cavity; 25. Balloon filling cavity; 26. Through hole; 3. Electrode; 4. Energy generator; 5. Blocking balloon; 51. First balloon; 52. Second balloon; 53. Medium source; 6. Magnetic component; 7. Human tissue; 91. Electrode; 92. Catheter. Detailed Implementation

[0082] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0083] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0084] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0085] like Figure 2 , 5 As shown in Figures 12 and 13, an ablation device includes a handle 1, a catheter 2, an electrode 3, and an energy generator 4. The catheter 2 extends along its length, with its proximal end connected to the handle 1 and its distal end forming an ablation segment 21 suitable for insertion into the patient's body cavity through a body passage. The movement and status changes of the catheter 2 within the patient's body cavity can be controlled by the handle 1.

[0086] To facilitate control of the operation and status changes of the catheter 2 by the handle 1, a lumen is provided inside the catheter 2, such as... Figure 10 , 11 As shown in Figures 14 and 15, a pull wire, a shaping wire, and a guide wire are installed inside the lumen. The pull wire is used to pull the catheter 2 to change the shape (size) of the ablation section 21 of the catheter 2. The pull wire is connected to the handle 1 and is controlled accordingly by the handle 1. The shaping wire keeps the ablation section 21 of the catheter 2 in the set shape. The electrode 3 is electrically connected to the energy generator 4 through a guide wire and can be controlled accordingly by the handle 1 (energy release, etc.).

[0087] Specifically, the catheter 2 can be a single-lumen tube, meaning that only one lumen extending along the extension direction of the catheter 2 is opened inside, and the pull wire, shaping wire, and lead wire are all placed in this lumen; the catheter 2 can also be a multi-lumen tube, meaning that multiple lumens extending along the extension direction of the catheter 2 are opened inside, including a pull wire lumen 22, a shaping wire lumen 23, and a lead wire lumen 24, which are used to pass through the pull wire, shaping wire, and lead wire, respectively. The shaping wire lumen 23 is set on the axis of the catheter to ensure accurate shaping. There are two pull wire lumens 22, which are respectively set opposite to each other on both sides of the shaping wire lumen 23, and the two pull wires are manipulated simultaneously to control the shape of the lead wire.

[0088] The catheter 2, especially the ablation section 21, can be bent into various shapes, the most common being annular. The annular diameter and shape of the ablation section 21 can be changed by a pull wire placed inside the catheter 2. In its working state, the ablation section 21 can have at least two working segments, namely a first working segment 211 and a second working segment 212. When the ablation section 21 is bent into an annular shape, the first working segment 211 and the second working segment 212 are adjacent in the axial and / or radial direction of the annular shape formed by the ablation section 21, and have a coincident angle around the axis of the annular shape formed by the ablation section 21. That is, the two working segments have corresponding overlapping portions in the axial and / or radial direction of the formed annular shape. When the distance between the two working segments is less than a set distance, it may cause a short circuit in the electrode 3, generating an electric arc. The ablation section 21 can have multiple working segments. Two adjacent working segments that meet the above characteristics can be referred to as the first working segment 211 and the second working segment 212. In practice, there are usually multiple sets of first working segments 211 and second working segments 212. Electrode 3 can be of various shapes, but is preferably a metal ring, sleeved or nested on the surface of conduit 2. Multiple electrodes 3 are provided, and multiple electrodes 3 are provided on ablation section 21. Energy generator 4 is connected to electrode 3 via wires and is used to provide ablation energy to electrode 3 on first working section 211 and second working section 212 in the working state. Specifically, energy generator 4 is a pulse generator to provide high-voltage pulses.

[0089] The ablation device also includes a blocking element disposed on the ablation section 21. The blocking element is used to prevent the generation of an electric arc. When the annular state of the ablation section 21 changes, the blocking element prevents the first working section 211 and the second working section 212 of the ablation section 21 from coming into contact with each other, thereby making the distance between the electrode 3 located on the first working section 211 and the electrode 3 located on the second working section 212 greater than a set distance, and this set distance is greater than zero, preventing the electrode 3 from short-circuiting and generating an electric arc. At the same time, when the blocking element protrudes from the surface of the conduit 2, especially above the height of the electrode 3, the blocking element can also be used to increase the electrical clearance between adjacent electrodes 3. The blocking components include a blocking balloon 5 and a magnetic component 6. The blocking balloon 5 prevents the first working section 211 and the second working section 212 from touching each other by supporting them apart. The magnetic component 6 prevents the first working section 211 and the second working section 212 from touching each other by pushing them apart with mutually repelling magnetic forces. Either the blocking balloon 5 or the magnetic component 6 can be used alone to prevent the two working sections from touching each other solely through support or magnetic force. Alternatively, both the blocking balloon 5 and the magnetic component 6 can be used together to simultaneously prevent the two working sections from touching each other using either support or magnetic force. The specific configuration of the blocking balloon 5 and the magnetic component 6 will be described in detail below.

[0090] like Figure 2 , 3 As shown in Figures 6 and 7, when the blocking element is a blocking balloon 5, multiple blocking balloons 5 are provided and distributed along the extension direction of the ablation section 21. The blocking balloons 5 are preferably located between adjacent electrodes 3, but it is not excluded that the blocking balloons 5 can cover the electrodes 3. Positioning them between the electrodes 3 can prevent the electrodes 3 on the first working section 211 and the second working section 212 from being too close together and generating an arc, while also avoiding affecting the ablation discharge of the electrodes 3. The positions of the blocking balloons 5 in the first working section 211 and the second working section 212 can have various combinations. The blocking balloons 5 can be provided only on the first working section 211, or only on the second working section 212, or both on the first working section 211 and the second working section 212. However, it must be ensured that the blocking balloons 5 can prevent the electrodes 3 on the first working section 211 and the second working section 212 from getting close to each other. Specifically, the blocking balloons 5 on the first working section 211 and the second working section 212 can be arranged alternately to avoid the blocking balloons 5 on the first working section 211 and the second working section 212 overlapping and causing the distance between the electrodes 3 to be too far. At the same time, it can ensure that there are blocking balloons 5 on both sides of the electrodes 3 on the first working section 211 and the second working section 212 to ensure a safe distance.

[0091] like Figure 2-11As shown, the blocking balloon 5 has a convex state and a contracted state. In the convex state, the blocking balloon 5 protrudes radially outward from the catheter 2; in the contracted state, the blocking balloon 5 contracts and adheres to the surface of the catheter 2. The blocking balloon 5 can be a structure with only a convex state, or it can be a structure that can switch between the convex and contracted states. In this embodiment, the latter will be specifically described. By controlling the pressure inside the blocking balloon 5, the size of the blocking balloon 5 is changed. The change in the blocking balloon 5 leads to a change in the distance between the first working section 211 and the second working section 212. This allows for adaptive adjustment of the distance between the first working section 211 and the second working section 212 according to the different discharge voltage requirements of the electrode 3. The blocking balloon 5 is made of compliant and / or semi-compliant materials to facilitate rapid inflation or contraction. Compliant materials include silicone and PU, and semi-compliant materials include nylon and Pebax. The ablation device also includes a medium source 53. An inflation channel is provided within the catheter 2, connecting the blocking balloon 5 to the medium source 53. Medium is introduced into the blocking balloon 5 through the inflation channel to change the pressure of the blocking balloon 5, thereby switching the blocking balloon 5 between a protruding state and a contracted state. Specifically, as... Figure 5 , 9 As shown in Figures 10 and 11, the catheter 2 also has a balloon inflation cavity 25 along its extension direction. The balloon inflation cavity 25 serves as an inflation channel. The ablation section 21 has a through hole 26 connecting the balloon inflation cavity 25 and the outer surface of the ablation section 21, and the through hole 26 leads to the blocking balloon 5. When the catheter 2 is a single-lumen tube, the inner lumen of the single-lumen tube is the balloon inflation cavity 25; when the catheter 2 is a multi-lumen tube, at least one of the lumens is the inflation cavity 25. Multiple blocking balloons 5 can be connected to the medium source 53 through one or more balloon inflation cavities 25. When the blocking balloon 5 is in a protruding state, the blocking balloon 5 protrudes to form a support surface. The support surface can abut against the first working section 211 or the second working section 212 to prevent the first working section 211 and the second working section 212 from abutting against each other. That is, the blocking balloon 5 is supported between the first working section 211 and the second working section 212, thereby supporting the first working section 211 and the second working section 212 apart. Preferably, the supporting surface rests against the ablation section 21 between adjacent electrodes 3 to prevent the blocking balloon 5 from obstructing the electrodes 3 and affecting their discharge ablation. When the first working section 211 and the second working section 212 are close together, the height of the supporting surface of the blocking balloon 5 relative to the surface of its adjacent electrode 3 is 0.1mm-3mm. That is, in this embodiment, the distance between the blocking balloon 5 and the first working section 211 and the second working section 212 is set at 0.1mm-3mm. When the height of the supporting surface is less than 0.1mm, it cannot achieve the purpose of blocking, and the electrodes 3 on the first working section 211 and the second working section 212 will still generate an electric arc. At the same time, if it is greater than 3mm, the distance between the first working section 211 and the second working section 212 will be too large, and the overall structure will be too wide, which is not conducive to intracardiac operation.

[0092] like Figure 12 As shown, the blocking balloon 5 is positioned on the ablation section 21, particularly between two adjacent electrodes 3. It can also increase the electrical gap between the two adjacent electrodes 3. When the blocking balloon 5 is in a protruding state, it forms a barrier between the two adjacent electrodes 3. This barrier increases the shortest spatial distance between the adjacent electrodes 3, thus increasing the electrical gap. This, in turn, allows for a higher discharge voltage without generating an electric arc at the same electrode spacing, improving the treatment effect. Figure 12 As shown, the electrical clearance increases from b to a. When the support surface does not abut against the first working section 211 or the second working section 212, in order to increase the electrical clearance between adjacent electrodes 3, the distance by which the blocking balloon 5 protrudes from the surface of the electrode 3 in the protruding state is 0.1cm-1cm. When the protrusion height of the blocking balloon 5 is less than 0.1cm, it cannot form a sufficiently high barrier to increase the electrical clearance, but when its height is greater than 1cm, the volume of the ablation section 21 in the human body is too large, which is not conducive to surgical operation.

[0093] like Figure 3 , 4 As shown in Figures 7, 8, and 12, the blocking balloon 5 includes a first balloon 51 and a second balloon 52. The blocking elements on the ablation section 21 can be selected from any combination of the first balloon 51 and the second balloon 52. When the first balloon 51 is in a protruding state, it protrudes radially from the ablation section 21 and forms a supporting surface. That is, after the first balloon 51 is inflated, it surrounds and covers the outer periphery of the catheter 2, which is suitable for various annular structures. The protrusion can be symmetrical or asymmetrical. When it is symmetrical, the blocking balloon 5 can stably block the first working section 211 and the second working section 212 from approaching each other without adjusting the annular direction and angle. However, if the working section is in contact with human tissue, the blocking balloon 5 is preferably asymmetrically protruding, such as... Figure 12 As shown, the distance the blocking balloon 5 protrudes towards the side closest to the human tissue 7 is less than the distance it protrudes in other directions. While minimizing the distance between it and the human tissue 7, it also increases the electrical clearance between adjacent electrodes 3 in other directions not in contact with the human tissue 7. When the second balloon 52 is in the protruding state, the second balloon 52 protrudes only from the radial side of the ablation section 21 and forms a support surface, facing the first working section 211 or the second working section 212. That is, the second balloon 52 is a single-sided balloon protruding from one side of the catheter 2. This type of structure is simple, stable, and durable.

[0094] like Figure 13-15As shown, when the blocking component is a magnetic component 6, multiple magnetic components 6 are provided and distributed along the extension direction of the ablation section 21, so that multiple magnetic components 6 are simultaneously distributed on the first working section 211 and the second working section 212. The polarity of the end of each magnetic component 6 facing the radially outer side of the conduit 2 is the same, and the repulsive magnetic force between the same polarities prevents the first working section 211 and the second working section 212 from approaching each other. The material of the magnetic component 6 includes soft magnetic materials and / or hard magnetic materials. Soft magnetic materials include metallic soft magnetic materials, ferrite soft magnetic materials, and magnetic media (made by bonding powder of metallic soft magnetic materials with insulating materials). Hard magnetic materials include ferrite, samarium cobalt, AlNiCo, and Rubidium iron boron. The shape of the magnetic component 6 includes square, tile-shaped, irregular, cylindrical, ring, disc, magnetic rod, and magnetic frame, etc., but it is preferably ring-shaped. When set as a ring, it is coaxially arranged with the conduit 2 to ensure uniform polarity and magnetic force in all directions. The magnetic component 2 can be provided on the outer surface of the conduit 2 or inside the conduit 2. Specifically, as Figure 13 As shown, when the magnetic component 6 is disposed on the outer surface of the ablation section 21, the magnetic component 6 is simultaneously located between two adjacent electrodes 3, ensuring that the working section where each electrode 3 is located can prevent adjacent working sections from approaching each other. Its working principle is similar to that of the blocking balloon 5 disposed between adjacent electrodes 3, replacing the supporting force of the blocking balloon 5 used to prevent the first working section 211 and the second working section 212 from approaching each other with the magnetic force of the mutually repelling magnetic component 6; when the magnetic component 6 is disposed inside the ablation section 21, as... Figure 14 As shown, if catheter 2 is a single-lumen tube, then magnetic element 6 is disposed on the inner surface of ablation section 21, such as... Figure 15 As shown, if the catheter 2 is a multi-lumen tube, the magnetic element 6 is embedded inside the ablation section 21 and sleeved around the outer periphery of the shaping wire cavity 23 to achieve coaxial arrangement with the ablation section 21. Preferably, the magnetic element 6 is located directly below the electrode 3, ensuring that each electrode 3 on the first working section 211 and the second working section 212 is pushed away by a repulsive force when it encounters another electrode 3 at a corresponding position on an adjacent working section. When the magnetic element 6 is located inside the electrode 3, it is insulated from the electrode 3. The magnetic element 6 can also be located between adjacent electrodes 3.

[0095] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

[0096] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

Claims

1. An ablation device, comprising: handle; A catheter extending along its length, the proximal end of which is connected to the handle, and the distal end of which forms a flexible ablation segment suitable for insertion into a patient's body cavity through a body passage, the ablation segment having at least two working segments in the working state, the two working segments being a first working segment and a second working segment, respectively; The electrode is provided in a plurality of manners, and the plurality of the electrodes are disposed on the ablation segment; Energy generator: used to provide ablation energy to the electrodes on the first and second working sections during operation; Its features are: The ablation device further includes a blocking element disposed on the ablation section. The blocking element is used to prevent the first working section and the second working section of the ablation section from abutting each other, thereby making the distance between the electrode on the first working section and the electrode on the second working section greater than a set distance, and the set distance is greater than zero. The blocking element includes a magnetic element, and multiple magnetic elements are disposed thereon. The multiple magnetic elements are distributed along the length direction of the ablation section, and the polarity of the end of each magnetic element facing the radial outer side of the catheter is the same.

2. The ablation device according to claim 1, characterized in that: The magnetic component is disposed inside the ablation section.

3. The ablation device according to claim 2, characterized in that: The magnetic element is disposed on the inner surface of the ablation section and is located directly below the electrode.

4. The ablation device according to claim 1, characterized in that: The magnetic element is disposed on the outer surface of the ablation section, and the magnetic element is located between two adjacent electrodes.

5. The ablation device according to claim 1, 2, or 4, characterized in that: The magnetic component is ring-shaped and is coaxially arranged with the conduit.

6. An ablation device, comprising: handle; A catheter extending along its length, the proximal end of which is connected to the handle, and the distal end of which forms a flexible ablation segment suitable for insertion into a patient's body cavity through a body passage, the ablation segment having at least two working segments in the working state, the two working segments being a first working segment and a second working segment, respectively; The electrode is provided in a plurality of manners, and the plurality of the electrodes are disposed on the ablation segment; Energy generator: used to provide ablation energy to the electrodes on the first and second working sections during operation; Its features are: The ablation device further includes a blocking member disposed on the ablation section. The height of the blocking member in the radial direction of the ablation section is higher than the height of the electrode in the radial direction of the ablation section. The blocking member can be used to prevent the first working section and the second working section of the ablation section from abutting each other, thereby making the distance between the electrode on the first working section and the electrode on the second working section greater than a set distance, and the set distance is greater than zero. It can also be used to increase the electrical clearance between adjacent electrodes. The blocking member includes a magnetic element, and multiple magnetic elements are disposed therein. The multiple magnetic elements are distributed along the length direction of the ablation section, and the polarity of the end of each magnetic element facing the radially outer side of the conduit is the same.

7. The ablation device according to claim 1 or 6, characterized in that: The blocking element includes a blocking balloon connected to the outer surface of the ablation segment and located between two adjacent electrodes. The blocking balloon has a protruding state and is in a convex state, protruding from the outer surface of the ablation segment.

8. The ablation device according to claim 7, characterized in that: The distance by which the blocking balloon protrudes from the outer surface of the ablation segment is 0.1 mm to 1 cm.

9. The ablation device according to claim 7, characterized in that: The blocking balloon includes a first balloon, which, when in a protruding state, protrudes radially from the ablation segment.

10. The ablation device according to claim 9, characterized in that: The first balloon protrudes equally from all four radial directions of the ablation segment, or The distance by which the first balloon protrudes from the side of the ablation segment intended to adhere to human tissue is less than the distance by which the first balloon protrudes from the ablation segment in other directions.

11. The ablation device according to claim 7, characterized in that: The blocking balloon includes a second balloon, which, when in a protruding state, protrudes only from one radial side of the ablation segment, which is the side facing the first or second working segment.

12. The ablation device according to claim 7, characterized in that: The blocking balloon also has a contracted state, in which the blocking balloon contracts onto the outer surface of the ablation segment.

13. The ablation device according to claim 12, characterized in that: The catheter has an inflatable channel inside, which is connected to the blocking balloon. The blocking balloon is filled with a medium through the inflatable channel, causing the blocking balloon to switch from a contracted state to a bulging state.

14. The ablation device according to claim 13, characterized in that: The catheter has only one lumen inside, which forms the filling channel; or The catheter has multiple lumens inside, and at least one of the lumens forms the filling channel.

15. The ablation device according to claim 1 or 6, characterized in that: The ablation segment is bent into a ring shape in a working state, and the first working segment and the second working segment are adjacent to each other in the axial and / or radial direction of the ring formed by the ablation segment.

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