Electrode assembly, ablation catheter and ablation system

Abstract

The present invention provides an electrode assembly, an ablation catheter and an ablation system, wherein the electrode assembly comprises at least a first electrode and a second electrode, wherein the second electrode is arranged farther away from the target tissue relative to the first electrode and can be used for current shunting. The working state of the second electrode can be switched between a contracted state and an expanded state. The ablation system comprises a pulse ablation module, an ablation catheter and a control device. The present invention enables the second electrode to shun current without generating a current electric field concentration effect by partially expanding the second electrode in the ablation catheter, thereby enabling the ablation catheter to be used in a pulse electric field with a higher voltage. In addition, since the first electrode cooperates with the second electrode for ablation, the ablation depth of the ablation catheter at the target tissue can also be increased. At the same time, the ablation system also preferably obtains the degree of contact between the ablation catheter and the target tissue through a control device.

Description

Technical Field

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

[0002] In the field of electrophysiological treatment, it is common to use ablation catheters to transfer energy and perform tissue ablation. After the tip (distal end) of the ablation catheter is inserted into the heart and reaches the corresponding treatment target, the energy platform connected to the tail (proximal end) of the ablation catheter sends energy media (such as radio frequency, ultrasound, pulse, etc.) to the energy delivery electrode on the tip of the ablation catheter. After the electrode is in contact with the tissue, it transfers energy to the tissue to perform point ablation or line ablation on the tissue.

[0003] The common pulsed electric field ablation catheter currently uses a combination of conventional head electrodes and ring electrodes to form a pulsed electric field for ablation. However, this type of ablation catheter is difficult to perform point ablation on thicker myocardial tissue. Since point ablation of thicker myocardial tissue requires the use of a pulsed ablation electric field with a higher voltage to reach a deeper ablation site, but in the high-voltage pulsed electric field, the edge of the ring electrode will form an electric field current concentration effect, thereby producing arc heat release, so that during the treatment process, the surface of the myocardial tissue will produce side effects such as carbonization, thrombosis and bubbles, limiting the ablation effect of the ablation catheter or causing ablation complications. In addition, the traditional point ablation catheter cannot sense the degree of contact between the ablation catheter and the myocardial tissue, which often causes the ablation catheter to form ineffective ablation. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, one object of the present invention is to provide an electrode assembly, an ablation catheter and an ablation system, which can be used in a pulse ablation electric field with a higher voltage to increase the ablation depth of the ablation catheter at the target tissue.

[0005] Meanwhile, another object of the present invention is to provide an ablation system capable of obtaining the degree of contact between the first electrode and the target tissue.

[0006] To achieve the above object, the present invention provides an electrode assembly, which can be used to transfer energy between a device and a target tissue. The electrode assembly can be arranged at the distal end of a catheter shaft, and the electrode assembly includes at least a first electrode and a second electrode. The first electrode is used to ablate the target tissue, and the second electrode is arranged farther away from the target tissue than the first electrode and can be used for current shunting.

[0007] The working state of the second electrode can be switched between a contracted state and an expanded state. When the second electrode is in the contracted state, at least a portion of the second electrode contracts inwardly; when the second electrode is in the expanded state, at least a portion of the second electrode expands outwardly.

[0008] Optionally, at least a portion of the second electrode extends along the longitudinal direction of the catheter shaft and is distributed around the circumference of the catheter shaft.

[0009] Optionally, the electrode assembly further includes a third electrode, which is disposed farther away from the target tissue than the second electrode and can be used to detect a working status of the second electrode.

[0010] Optionally, the electrode assembly further includes a fourth electrode, which is disposed closer to the target tissue than the second electrode, and the fourth electrode can be used in conjunction with the third electrode to detect a working state of the second electrode.

[0011] Optionally, the fourth electrode is located between the first electrode and the second electrode.

[0012] Optionally, the second electrode includes at least one linear electrode, and at least a portion of at least one of the linear electrodes is capable of switching between the contracted state and the expanded state.

[0013] Optionally, the second electrode includes a plurality of first sub-electrodes, which extend longitudinally along the catheter axis and are distributed circumferentially around the catheter axis; the second electrode also includes a plurality of second sub-electrodes, which extend transversely along the catheter axis, and both ends of each second sub-electrode are respectively connected to two adjacent first sub-electrodes; the second sub-electrodes are V-shaped.

[0014] To achieve the above-mentioned object, the present invention further provides an ablation catheter, comprising a catheter shaft and the electrode assembly, wherein the electrode assembly is arranged at the distal end of the catheter shaft.

[0015] Optionally, the catheter shaft includes a first catheter shaft and a second catheter shaft, the distal end of the second electrode is connected to the first catheter shaft, the proximal end of the second electrode is connected to the second catheter shaft, and the relative movement of the first catheter shaft and the second catheter shaft can enable the second electrode to switch between the contracted state and the expanded state.

[0016] Optionally, the first catheter shaft is inserted into the second catheter shaft, the ablation catheter further comprises a sleeve, the sleeve is sleeved on the first catheter shaft, and the distal end of the second electrode is fixedly connected to the sleeve.

[0017] Optionally, the first electrode and / or a fourth electrode of the electrode assembly, which is arranged closer to the target tissue than the second electrode, is fixed on the sleeve.

[0018] To achieve the above object, the present invention further provides an ablation system, comprising a pulse ablation module and any one of the ablation catheters described above, wherein the pulse ablation module is used to deliver high-voltage pulses to the ablation catheter.

[0019] Optionally, the ablation system further includes a control device, and the control device is capable of detecting a working state of the second electrode.

[0020] To achieve the above-mentioned purpose, the present invention also provides an ablation system, including a pulse ablation module and an ablation catheter, the pulse ablation module is used to emit high-voltage pulses to the ablation catheter, the ablation catheter includes a catheter shaft and an electrode assembly, the electrode assembly includes at least a first electrode, a second electrode and a third electrode, the first electrode is used to ablate the target tissue, the second electrode is a structure that can undergo elastic deformation, the second electrode is arranged farther away from the target tissue relative to the first electrode, and the third electrode is arranged farther away from the target tissue relative to the second electrode. The ablation system also includes a control device, which can detect the working state of the second electrode and obtain the degree of contact between the first electrode and the target tissue based on the working state.

[0021] Optionally, the control device includes a positioning module and an abutment detection module, the positioning module can obtain position information reflecting the working state of the second electrode, and the abutment detection module can obtain the degree of abutment between the first electrode and the target tissue based on the position information.

[0022] Optionally, the location information includes any one of the following location information:

[0023] position information of the first electrode and a third electrode disposed farther from the target tissue than the second electrode;

[0024] position information of a third electrode and a fourth electrode disposed closer to the target tissue relative to the second electrode;

[0025] Position information of the first electrode, the third electrode and the fourth electrode.

[0026] Optionally, the working state includes a deformation form and a deformation amount of the second electrode, and the deformation form reflects a compression or bending state of the second electrode.

[0027] Optionally, the control device can determine whether the contact force between the electrode assembly and the target tissue reaches a preset value. If it is determined that the contact force reaches the preset value, the control device sends a pulse release signal to the pulse ablation module.

[0028] Optionally, the ablation system further includes a visualization interface, and the visualization interface can display the degree of contact between the first electrode and the target tissue.

[0029] Optionally, the positioning module can obtain the position information of the first electrode, establish a heart computer model according to the position information of the first electrode, and display the heart computer model on a visualization interface of the ablation system.

[0030] The present invention allows the second electrode in the ablation catheter to partially expand outward, so that the second electrode has a larger surface area. When the ablation catheter is performing ablation, compared with the traditional ring electrode, the second electrode that can expand outward can shunt the current and will not produce the current electric field concentration effect, so the second electrode can carry a larger current, and can also avoid the second electrode from generating arc heat release and the side effects such as carbonization, thrombosis and bubbles on the surface of the target tissue, thereby ensuring that the ablation catheter can be used in a high-voltage pulse electric field. At the same time, since the first electrode is used to ablate the target tissue, when the first electrode and the second electrode are used in conjunction with each other, the current flowing through the first electrode can also be larger (that is, the current intensity flowing through the first electrode is increased), and the increase in the current of the first electrode can enhance the ablation depth of the target tissue by the ablation catheter.

[0031] The present invention can also assist the ablation treatment of the ablation catheter by setting a control device to follow and obtain the degree of contact between the first electrode and the target tissue in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in a preferred embodiment of the present invention;

[0033] Figure 2 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in another preferred embodiment of the present invention;

[0034] Figure 3 It is a schematic diagram of a part of the structure of the ablation catheter when the second electrode is in a contracted state in a preferred embodiment of the present invention;

[0035] Figure 4 It is a structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in a preferred embodiment of the present invention;

[0036] Figure 5 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in another preferred embodiment of the present invention;

[0037] Figure 6 A control principle diagram of an ablation system provided by a preferred embodiment of the present invention;

[0038] Figure 7 A schematic diagram of the position of the electrode assembly when the second electrode is in a compressed state in a preferred embodiment of the present invention;

[0039] Figure 8 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in a bent state in another preferred embodiment of the present invention;

[0040] Fig. 9 for Figure 8 Schematic diagram of the location of the middle electrode assembly.

[0041] The following are the descriptions of the reference numerals:

[0042] Ablation catheter 1; catheter shaft 11; first catheter shaft 111; second catheter shaft 112; electrode assembly 12; first electrode 121; second electrode 122; linear electrode 1221; first sub-electrode 1222; second sub-electrode 1223; third electrode 123; fourth electrode 124; pulse ablation module 2; positioning module 3; and abutment detection module 4. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0044] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] The orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or a connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] It should also be understood that in the following description, "proximal end" and "distal end" refer to the relative position, relative location and direction of each other's components or actions from the perspective of the doctor using the ablation catheter. Although "proximal end" and "distal end" are not restrictive, "proximal end" generally refers to the end of the ablation catheter that is close to the doctor during normal operation, and correspondingly, "distal end" generally refers to the end of the ablation catheter that first enters the body during normal operation. In addition, "connection" includes direct connection between systems, components, and parts, and also includes connection between systems, components, and parts through a medium, that is, indirect connection.

[0048] Figure 1 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in a preferred embodiment of the present invention. Figure 2 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in another preferred embodiment of the present invention. Figure 3 It is a partial structural schematic diagram of the ablation catheter when the second electrode is in a contracted state in a preferred embodiment of the present invention. Figure 4 It is a structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in a preferred embodiment of the present invention. Figure 5 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in an expanded state in another preferred embodiment of the present invention. Figure 6 A control schematic diagram of an ablation system provided in a preferred embodiment of the present invention. Figure 7 It is a schematic diagram of the position of the electrode assembly when the second electrode is in a compressed state in a preferred embodiment of the present invention. Figure 8 It is a partial structural schematic diagram of an ablation catheter when the second electrode is in a bent state in another preferred embodiment of the present invention. Fig. 9 for Figure 8 Schematic diagram of the location of the middle electrode assembly.

[0049] Reference Figure 1 to Figure 5As shown, the present invention provides an ablation catheter 1, comprising a catheter shaft 11 and an electrode assembly 12, wherein the electrode assembly 12 can be used to transfer energy between the device and the target tissue, and the electrode assembly 12 can be arranged at the distal end of the catheter shaft 11. The electrode assembly 12 comprises a first electrode 121 and a second electrode 122, wherein the first electrode 121 is used to ablate the target tissue, and the second electrode 122 is arranged farther away from the target tissue relative to the first electrode 121 and can be used for current shunting. It should be known that the target tissue is generally determined by the operator based on experience, and the target tissue is usually a lesion site (i.e., abnormal myocardial tissue). Current shunting in this application refers to increasing the surface area of ​​the second electrode 122 so that the current density flowing through the second electrode 122 is reduced, thereby increasing the current density of the first electrode 121 used in conjunction with the second electrode 122 (i.e., the current intensity flowing through the first electrode 121 is increased), thereby enhancing the ablation depth of the target tissue by the ablation catheter 1.

[0050] The working state of the second electrode 122 can be switched between a contracted state and an expanded state. When the second electrode 122 is in the contracted state, at least a portion of the second electrode 122 contracts inwardly; when the second electrode 122 is in the expanded state, at least a portion of the second electrode 122 expands outwardly. The second electrode 122 preferably includes at least one linear electrode 1221, and at least a portion of at least one linear electrode 1221 can be switched between the contracted state and the expanded state. In one embodiment, the second electrode 122 includes a single linear electrode 1221, and the shape of the single linear electrode 1221 can be spiral. The spiral linear electrode 1221 can expand or contract in the axial direction. Since the single spiral linear electrode 1221 has a large surface area, the current density flowing through the single linear electrode 1221 can be reduced, and the spiral structure of the single linear electrode 1221 will not produce the electric field concentration effect of the current, thereby increasing the current density of the first electrode 121 and enhancing the ablation depth of the ablation catheter 1 on the target tissue.

[0051] It should be understood that the linear electrode 1221 in the present application may be an electrode shaped like a wire (or a linear electrode), which generally extends along the longitudinal direction of the catheter shaft 11, or the linear electrode 1221 may be a patch electrode.

[0052] Preferably, at least a portion of the second electrode 122 extends in the longitudinal direction of the catheter shaft 11 and is distributed around the circumference of the catheter shaft 11. The longitudinal direction here refers to the extension direction of the catheter shaft 11. Optionally, both ends of the linear electrode 1221 are respectively connected to the catheter shaft 11, and at least one linear electrode 1221 can be evenly or unevenly distributed around the circumference of the catheter shaft 11, preferably evenly distributed. And at least one linear electrode 1221 can be connected or unconnected in the transverse direction of the catheter shaft 11. The transverse direction here roughly refers to the circumference of the catheter shaft 11.

[0053] In this embodiment, the second electrode 122 is similar to a hollow stent structure and can be contracted or expanded. When the second electrode 122 is in a contracted state, at least one linear electrode 1221 contracts inwardly, such as Figure 3 When the second electrode 122 is in an expanded state, at least one linear electrode 1221 expands outward, as shown in FIG. Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, at least one linear electrode 1221 is in contact with the target tissue. When the second electrode 122 is a hollow stent structure, "inward" refers to the direction close to the central axis of the catheter shaft 11; "outward" refers to the direction away from the central axis of the catheter shaft 11. In other embodiments, the linear electrode 1221 may also be a patch electrode, which is preferably arranged on a substrate, and the substrate is connected to the catheter shaft 11. A plurality of patch electrodes may be distributed along the longitudinal, circumferential or other directions of the substrate. When the substrate is in a contracted state, the plurality of patch electrodes contract inward; when the substrate is in an expanded state, the plurality of patch electrodes are driven to expand outward to be in contact with the target tissue.

[0054] The present invention allows the second electrode 122 in the ablation catheter 1 to partially expand outward, so that the second electrode 122 has a larger surface area. When the ablation catheter 1 is ablated, compared with the traditional ring electrode, the second electrode 122 that can expand outward can shunt the current and will not produce the current electric field concentration effect, so the second electrode 122 can carry a larger current, and can also avoid the second electrode 122 from generating arc heat release and the side effects such as carbonization, thrombus and bubbles on the surface of the target tissue, thereby ensuring that the ablation catheter 1 can be used in a high-voltage pulse electric field. At the same time, since the first electrode 121 is used to ablate the target tissue, when the first electrode 121 and the second electrode 122 are used in conjunction with each other, the current flowing through the first electrode 121 can also be larger (that is, the current intensity flowing through the first electrode 121 is increased), and the increase in the current of the first electrode 121 can enhance the ablation depth of the target tissue by the ablation catheter 1.

[0055] like Figure 3 As shown, when the second electrode 122 is in a contracted state, each linear electrode 1221 contracts inwardly, which can ensure that the ablation catheter 1 has a smaller outer diameter, so that the ablation catheter 1 can move more conveniently in the human blood vessel. Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, when the second electrode 122 is in an expanded state, each linear electrode 1221 expands outward, so that the second electrode 122 has a larger outer diameter, so that the linear electrode 1221 can better fit the target tissue. While the second electrode 122 has a larger discharge surface area, the electrode assembly 12 can also be better supported by the expansion of the second electrode 122, and is not easily displaced, and has better positioning support. Therefore, since the second electrode 122 is contractible and expandable, it is convenient to compress or bend, and can better fit the target tissue, and the ablation effect is good. At the same time, when the ablation catheter 1 is ablating the target tissue, the linear electrode 1221 is in an expanded state. At this time, since a certain amount of heat is generated at the linear electrode 1221, the linear electrode 1221 in the expanded state can use the blood in the blood vessel to cool down, that is, a part of the blood in the blood vessel can flow through the inner wall and outer wall of the linear electrode 1221, further avoiding the problems of carbonization, thrombus and bubbles on the surface of the target tissue around the second electrode 122.

[0056] Further, when the second electrode 122 contracts, each linear electrode 1221 may be attached to the catheter shaft 11. It should be understood that the attachment may be that the contracted linear electrode 1221 is parallel or substantially parallel to the catheter shaft 11, or the contracted linear electrode 1221 is attached to the surface of the catheter shaft 11.

[0057] In one embodiment, referring to Figure 1 As shown, the second electrode 122 as a whole can be woven from linear electrodes 1221. Preferably, the linear electrodes 1221 can be woven to form at least one linear electrode group. At least one linear electrode group can be woven from at least two linear electrodes 1221 in an interlaced manner. At least one linear electrode group can be expanded along the radial direction of the ablation catheter 1. In this way, the second electrode 122 can have sufficient strength, so that it is not easy to break or be damaged when the second electrode 122 is contracted or expanded.

[0058] In another embodiment, referring to Figure 2 As shown, the second electrode 122 is formed by linear electrodes 1221 arranged in sequence in the circumferential direction of the catheter shaft 11, and the second electrode 122 is preferably prepared by laser cutting a stent. In this embodiment, the length of each linear electrode 1221 is the same, so that each linear electrode 1221 can be in contact with the target tissue at the same time, so that the ablation catheter 1 can be better supported. It should be known that the present invention does not limit the number and shape of the linear electrodes 1221, and the way in which the linear electrodes 1221 form the second electrode 122, and at least one linear electrode 1221 can meet the requirements of expanding outward and contacting with the target tissue.

[0059] In other embodiments, reference Figure 5As shown, the second electrode 122 includes a plurality of first sub-electrodes 1222, the first sub-electrodes 1222 extend in the longitudinal direction of the catheter axis 11, and the plurality of first sub-electrodes 1222 are distributed around the circumference of the catheter axis 11; the second electrode 122 also includes a plurality of second sub-electrodes 1223, the second sub-electrodes 1223 extend in the transverse direction of the catheter axis 11, and the two ends of each second sub-electrode 1223 are respectively connected to two adjacent first sub-electrodes 1222; the second sub-electrodes 1223 are V-shaped. Preferably, the plurality of second sub-electrodes 1223 are parallel to each other. In this way, the second sub-electrodes 1223 can be set on the second electrode 122 to perform shunting, reduce the current intensity in each second sub-electrode 1223, and at the same time, the V-shaped second sub-electrodes 1223 can be set to facilitate the contraction and folding of the second electrode 122.

[0060] Furthermore, the surface of the second electrode 122 is preferably coated with an inert metal coating to improve the development performance of the second electrode 122 and enhance the electrochemical inertness of the second electrode 122. Preferably, the material of the first electrode 121 and the third electrode 123 is an inert metal or a platinum-iridium alloy.

[0061] In this embodiment, the second electrode 122 may be a self-expanding structure, for example, the material of the second electrode 122 may include a memory alloy material, such as a nickel-titanium alloy or other memory alloy materials. In this case, the second electrode 122 can expand autonomously after entering a human blood vessel and leaving the sheath without the need for external force to achieve expansion. Of course, in other embodiments, the second electrode 122 may also be pushed to contract or expand with the help of external force.

[0062] Furthermore, the electrode assembly 12 also includes a third electrode 123, which is arranged farther away from the target tissue than the second electrode 122 and can be used to detect the working state of the second electrode 122. The first electrode 121, the second electrode 122, and the third electrode 123 are preferably arranged in an axial direction of the catheter shaft 11 and insulated from each other. In one embodiment, the third electrode 123 can cooperate with the first electrode 121 to detect the working state of the second electrode 122. In this embodiment, from the distal end to the proximal end of the catheter shaft 11, the first electrode 121, the second electrode 122, and the third electrode 123 are arranged in sequence, as shown in FIG. Figures 1 to 4 As shown. The present application does not limit the material of the catheter shaft 11. Typically, the material of the catheter shaft 11 is a high molecular polymer, for example, the material of the catheter shaft 11 is polyurethane or segmented polyetheramide resin (Pebax for short). Further, the third electrode 123 may be a ring electrode or other types of electrodes, such as a patch electrode. In this embodiment, the third electrode 123 is a ring electrode.

[0063] In actual use, the ablation catheter 1 is used to receive high-voltage pulses, and form a high-voltage pulse electric field through the combination of the first electrode 121 and the second electrode 122 to ablate the target tissue. It should be understood that when the third electrode 123 is a ring electrode, under the high-voltage pulse electric field, in order to avoid the electric field current concentration effect formed by the third electrode 123, the first electrode 121 and the second electrode 122 mainly cooperate with each other to ablate the target tissue, and the third electrode 123 mainly performs signal mapping and detection of the working state of the second electrode 122, but under a lower pulse electric field, the third electrode 123 can also ablate the target tissue. In this embodiment, the end of the first electrode 121 is preferably set to an arc shape, which can make the first electrode 121 have a larger contact area with the target tissue, and can also reduce the damage to the target tissue when the ablation catheter 1 moves.

[0064] Preferably, the electrode assembly 12 further includes a fourth electrode 124. In one embodiment, the fourth electrode 124 is arranged closer to the target tissue than the second electrode 122, and the fourth electrode 124 cooperates with the third electrode 123 to detect the working state of the second electrode 122. In another embodiment, the fourth electrode 124 may also be arranged between the second electrode 122 and the third electrode 123, and in this case, the first electrode 121 cooperates with the fourth electrode 124, or the first electrode 121 cooperates with the third electrode 123 to detect the working state of the second electrode 122. In this embodiment, the fourth electrode 124 is a ring electrode. The fourth electrode 124 can be used for signal mapping and detection of the working state of the second electrode 122. When the ablation catheter 1 is used in a lower pulse electric field, the ablation catheter 1 may also use one of the first electrode 121, the second electrode 122 and the third electrode 123 to cooperate with the fourth electrode 124 to ablate the target tissue. The material of the fourth electrode 124 may be an inert metal or a platinum-iridium alloy.

[0065] In this embodiment, at least one end of each linear electrode 1221 is fixed to the catheter shaft 11, that is, one end or both ends of the linear electrode 1221 can be fixed to the catheter shaft 11. For example, in one embodiment, one end of the linear electrode 1221 can be fixed to the catheter shaft 11, and the other end can be movably connected to the catheter shaft 11, and an external mechanism (such as a traction wire) is connected to the movable end of the linear electrode 1221 to make the linear electrode 1221 contract or expand.

[0066] In this embodiment, refer to Figure 1 and Figure 2As shown, the catheter shaft 11 includes a first catheter shaft 111 and a second catheter shaft 112, the distal end of the second electrode 122 is connected to the first catheter shaft 111, the proximal end of the second electrode 122 is connected to the second catheter shaft 112, the first catheter shaft 111 is slidably connected to the second catheter shaft 112, and the relative movement of the first catheter shaft 111 and the second catheter shaft 112 can switch the second electrode 122 between a contracted state and an expanded state. It should be understood that the sliding connection between the first catheter shaft 111 and the second catheter shaft 112 can be that the first catheter shaft 111 is inserted and moved in the second catheter shaft 112, or the second catheter shaft 112 is inserted and moved in the first catheter shaft 111.

[0067] In this embodiment, the first catheter shaft 111 is movably disposed in the second catheter shaft 112. At this time, the first catheter shaft 111 is the inner tube of the ablation catheter 1, and the second catheter shaft 112 is the outer tube of the ablation catheter 1. The distal end of the second electrode 122 is connected to the inner tube, and the proximal end of the second electrode 122 is connected to the outer tube to ensure that the second electrode 122 can be switched between a contracted state and an expanded state. Specifically, when the inner tube moves toward the proximal end of the outer tube, the second electrode 122 switches from a contracted state to an expanded state; when the inner tube moves toward the distal end of the outer tube, the second electrode 122 switches from an expanded state to a contracted state.

[0068] Preferably, a braided layer is provided on the outer wall of the first catheter shaft 111 and / or the second catheter shaft 112 to enhance the supporting force. The braided layer is braided by braided wires.

[0069] Preferably, when the first catheter shaft 111 is inserted into the second catheter shaft 112, the ablation catheter 1 further includes a sleeve (not shown), which is sleeved on the first catheter shaft 111, and the distal end of the second electrode 122 is fixedly connected to the sleeve. Since the outer diameter of the inner tube needs to be smaller than the outer diameter of the outer tube, the line connecting the two ends of the linear electrode 1221 cannot be parallel to the axis of the catheter shaft 11, that is, the actual expansion distance of the linear electrode 1221 cannot reach its maximum expansion distance (that is, half of the longitudinal length of the linear electrode 1221). When the linear electrode 1221 is in an expanded state, the linear electrode 1221 may not be well attached to the target tissue, limiting the ablation effect of the ablation catheter 1. By arranging a sleeve outside the inner tube, the outer diameter of the sleeve can be made the same as the outer diameter of the outer tube, so that when the linear electrode 1221 expands, the expansion distance of the linear electrode 1221 can reach its maximum expansion distance, and the linear electrode 1221 can better adhere to the target tissue so that the electrode assembly 12 can be better supported, thereby ensuring that the ablation catheter 1 has a better ablation effect.

[0070] Preferably, the first electrode 121 and / or the fourth electrode 124 of the electrode assembly 12, which is arranged closer to the target tissue than the second electrode 122, is fixed on the sleeve. In addition, the present invention increases the outer diameter of the inner tube by arranging the sleeve, that is, increases the outer diameter of the first electrode 121 and / or the fourth electrode 124, increases the current density value that the first electrode 121 and / or the fourth electrode 124 can carry, and further increases the ablation depth of the ablation catheter 1. Of course, in other embodiments, the first electrode 121 and / or the fourth electrode 124 can also be fixed on the first catheter shaft 111.

[0071] Reference Figure 1 and Figure 6 As shown, the present invention also provides an ablation system, the ablation system includes an ablation catheter 1 and a pulse ablation module 2, the pulse ablation module 2 is used to issue high-voltage pulses to the electrode assembly 12 of the ablation catheter 1, and the pulse ablation module 2 is mainly a high-voltage pulse generator. The ablation catheter 1 includes a catheter shaft 11 and an electrode assembly 12, and the electrode assembly 12 includes at least a first electrode 121, a second electrode 122, and a third electrode 123. The ablation system also includes a control device, which can detect the working state of the second electrode 122, and obtain the degree of contact between the first electrode 121 and the target tissue according to the working state of the second electrode 122.

[0072] Further, the control device includes a positioning module 3 and a contact detection module 4, the positioning module 3 can obtain position information reflecting the working state of the second electrode 122, and the contact detection module 4 can obtain the contact degree between the first electrode 121 and the target tissue according to the position information. Specifically, the contact detection module 4 can obtain the contact force between the first electrode 121 and the target tissue according to the position information, so as to judge the contact degree between the first electrode 121 and the target tissue according to the contact force. The positioning module 3 and the contact detection module 4 can be connected in communication. Since the traditional ablation catheter 1 cannot sense the contact degree between the electrode assembly 12 and the target tissue, invalid ablation is often caused due to the loose contact between the electrode assembly 12 and the target tissue. The present invention can follow and obtain the contact force of the first electrode 121 at the target tissue in real time by setting the positioning module 3 and the contact detection module 4, and feed back the real-time contact force value to the operator, so that the operator can conveniently and intuitively obtain the contact degree between the ablation catheter 1 and the target tissue, thereby assisting the ablation treatment of the ablation catheter 1. It should be understood that the positioning module 3 and the abutment detection module 4 may or may not be integrated into one control device.

[0073] Preferably, in one embodiment, the position information includes the position information of the first electrode 121 and the third electrode 123; in another embodiment, the position information includes the position information of the third electrode 123 and the fourth electrode 124; in other embodiments, the position information may also include the position information of the first electrode 121, the third electrode 123 and the fourth electrode 124. It should be understood that when the second electrode 122 is in a bent state, since the plane where the second electrode 122 is located cannot be determined based on the position information of the first electrode 121 and the third electrode 123, that is, the position information of the second electrode 122 cannot be accurately obtained, the fourth electrode 124 is provided in the present invention so that the contact detection module 4 can accurately obtain the deformation form and deformation amount of the second electrode 122 based on the position information of the first electrode 121, the third electrode 123 and the fourth electrode 124.

[0074] Preferably, the working state includes a deformation form and a deformation amount of the second electrode 122 , and the deformation form reflects a compression or bending state of the second electrode 122 .

[0075] Preferably, the ablation system further includes a visualization interface, which can display the degree of contact between the first electrode 121 and the target tissue. In one embodiment, the visualization interface can display the degree of contact between the first electrode 121 and the target tissue. In another embodiment, the operator can obtain the contact force of the first electrode 121 through the visualization interface, and judge the degree of contact between the ablation catheter 1 and the target tissue accordingly.

[0076] In this embodiment, since the second electrode 122 is a structure capable of elastic deformation, when the first electrode 121 of the ablation catheter 1 reaches the target tissue, the target tissue will cause resistance to the movement of the first electrode 121. After encountering resistance, the first electrode 121 will transfer the resistance to the second electrode 122, thereby causing the second electrode 122 to be compressed or bent. After the second electrode 122 is deformed, a strain force will be generated and transferred to the first electrode 121, so that the first electrode 121 is close to the target tissue and generates a certain abutment force, wherein the strain force of the second electrode 122 is approximately equal to the abutment force of the first electrode 121. The abutment detection module 4 can obtain the strain force of the second electrode 122 and the abutment force of the first electrode 121 according to the working state of the second electrode 122, so as to judge the degree of abutment between the electrode assembly 12 and the target tissue according to the abutment force between the first electrode 121 and the target tissue. It should be understood that the structure capable of elastic deformation in this application means that the second electrode 122 can be elastically deformed as needed, and in this embodiment, it means that the second electrode 122 can be compressed and bent.

[0077] In one embodiment, when the electrode assembly 12 includes a first electrode 121, a second electrode 122 and a third electrode 123, and the second electrode 122 is in a compressed state or a bent state, the strain force of the second electrode 122 generally satisfies Hooke's law: F=kx, wherein F (in N) is the strain force of the second electrode 122 (approximately the abutment force of the first electrode 121), k (in N / m) is the deformation coefficient of the second electrode 122, and x (in m) is the deformation amount of the second electrode 122. Furthermore, the deformation coefficient k of the second electrode 122 in a compressed state or a bent state can be obtained by experimentally characterizing the strain force and deformation amount of the second electrode 122 in a compressed state or a bent state (i.e., the strain force F' and deformation amount x' of the second electrode 122 in different compressed states or bent states are obtained by experiment, and then the deformation coefficient k of the second electrode 122 in different compressed states and bent states is calculated according to Hooke's law); at the same time, since the deformation amount x of the second electrode 122 in a bent state is not easy to detect, in the present application, the actual displacement d (in m) of the second electrode 122 can be approximately regarded as the deformation amount x of the second electrode 122, and at this time, the strain force formula of the second electrode 122 is approximately: F = kd. Reference Figure 7 As shown, Figure 7 The hollow circle 123' indicates the position of the third electrode 123 when the second electrode 122 is not deformed, and the solid circles 121 and 123 indicate the positions of the first electrode 121 and the third electrode 123 when the second electrode 122 is bent. The calculation formula for the actual displacement d of the second electrode 122 in the present application is: d = D 0 -D 1 , where D 0 represents the original distance between the first electrode 121 and the third electrode 123 (ie, the distance between the first electrode 121 and the third electrode 123 when the second electrode 122 is not compressed or bent), D 0 The value can be obtained by measuring the ablation catheter 1 in vitro; D 1 The D1 value represents the ablation distance between the first electrode 121 and the third electrode 123 (i.e., the distance between the first electrode 121 and the third electrode 123 measured after the ablation catheter 1 reaches the target tissue and before ablation is prepared, at which time the second electrode 122 has contracted or bent). The D1 value can be obtained by detecting and calculating the positions of the first electrode 121 and the third electrode 123 of the ablation catheter 1 in the body, at which time the first electrode 121 and the third electrode 123 are both mapping electrodes. The strain force F of the second electrode 122 in the compressed state can be calculated by the above formula. 1 or F in the bent state 2 When the second electrode 122 is in a compressed state and a bent state (ie, the second electrode 122 is both compressed and bent), the strain force F of the second electrode 122 in the compressed state can be 1and the strain force F of the second electrode 122 in the bending state 2 The total strain force F when the second electrode 122 is deformed is obtained by vector addition. 总 , at this time the total strain force F 总 It is approximately equal to the abutment force of the first electrode 121 .

[0078] In another embodiment, when the electrode assembly 12 includes the first electrode 121, the second electrode 122, the third electrode 123 and the fourth electrode 124, and the second electrode 122 is in a compressed state, the strain force of the second electrode 122 also satisfies the above-mentioned Hooke's law F=kx, that is, the calculation formula for the actual displacement d of the second electrode 122 is: d=D 0 -D 1 , at this time, the actual displacement d (in m) of the second electrode 122 can also be approximately regarded as the deformation x of the second electrode 122. At this time, D 0 represents the original distance between the first electrode 121 and the third electrode 123, or between the third electrode 123 and the fourth electrode 124 (i.e., the distance between the first electrode 121 and the third electrode 123, or between the third electrode 123 and the fourth electrode 124 when the second electrode 122 is not compressed or bent), D 0 The value can be obtained by measuring the ablation catheter 1 in vitro; D 1 represents the ablation distance between the first electrode 121 and the third electrode 123, or the third electrode 123 and the fourth electrode 124 (i.e., the distance between the first electrode 121 and the third electrode 123, or the third electrode 123 and the fourth electrode 124 measured after the ablation catheter 1 reaches the target tissue and before ablation is prepared, at which time the second electrode 122 has contracted or bent), thereby obtaining the strain force F of the second electrode 122 in the compressed state 1 When the second electrode 122 is in a bent state, refer to Figure 8 and Fig. 9 As shown, Fig. 9 The hollow circle 123' indicates the position of the third electrode 123 when the second electrode 122 is not deformed, and the solid circles 121, 124 and 123 indicate the positions of the first electrode 121, the fourth electrode 124 and the third electrode 123 when the second electrode 122 is bent. At this time, the bending shape of the second electrode 121 can be calculated and fitted through the relative positions of the first electrode 121, the fourth electrode 124 and the third electrode 123, and the different deformation amounts x1 and x2 of the second electrode 122 in the x direction and the y direction are calculated, and the elastic coefficient k of the second electrode 122 in the x direction and the y direction is x and k yIt can be obtained through experimental characterization, so that the elastic forces Fx and Fy in the x-direction and y-direction can be calculated according to Hooke's law, and then the strain force F of the second electrode 122 in the bending state can be obtained by vector addition of Fx and Fy. 2 When the second electrode 122 is in a compressed state and a bent state (ie, the second electrode 122 is both compressed and bent), the strain force F of the second electrode 122 in the compressed state can be 1 and the strain force F of the second electrode 122 in the bent state 2 The total strain force F when the second electrode 122 is deformed is obtained by vector addition. 总 , at this time the total strain force F 总 It is approximately equal to the abutment force of the first electrode 121 .

[0079] Optionally, the pulse ablation module 2 is connected to the control device for communication, and the control device can control the pulse emission state of the pulse ablation module 2 according to the contact force between the first electrode 121 and the target tissue. In some embodiments, the control device is also used to determine whether the contact force between the electrode assembly 12 and the target tissue has reached a preset value. If it is determined that the contact force preset value has been reached, the control device determines that the first electrode 121 has been in contact with the target tissue, and the control device sends a pulse release signal to the pulse ablation module 2. The pulse ablation module 2 sends a high-voltage pulse to the electrode assembly 12 according to the pulse release signal. Of course, in other embodiments, the pulse ablation module 2 may also not be connected to the control device for communication. At this time, the operator can determine whether the contact force between the electrode assembly 12 and the target tissue has reached a preset value. If the contact force preset value has been reached, the first electrode 121 has been in contact with the target tissue, and the operator manually controls the pulse ablation module 2 to send a high-voltage pulse to the electrode assembly 12.

[0080] Preferably, the positioning module 3 is also used to obtain the position information of the first electrode 121. It should be understood that the positioning module 3 can obtain the position information of the first electrode 121 in real time by at least one of electrical positioning, magnetic positioning and acoustic positioning, such as setting a magnetic positioning sensor at a position of the catheter shaft 11 adjacent to the first electrode 121, and obtaining the position of the first electrode 121 by the magnetic positioning sensor.

[0081] Optionally, the positioning module 3 may directly obtain the position information of the first electrode 121, or the positioning module 3 may indirectly obtain the position information of the first electrode 121 through the position information of the third electrode 123 and / or the fourth electrode 124. Since the distance between the first electrode 121 and the third electrode 123, or the distance between the first electrode 121 and the fourth electrode 124 on the ablation catheter 1 is a fixed value, the positioning module 3 may infer the position information of the first electrode 121 according to the position information of the third electrode 123 or the fourth electrode 124.

[0082] The positioning module 3 can obtain the position information of the first electrode 121, and establish a heart computer model according to the position information of the first electrode 121, and display it in the visual interface of the ablation system to facilitate the operator to obtain the internal situation of the target tissue. After the heart computer model is established, the operator can control the ablation catheter 1 according to the heart computer model so that the electrode assembly 12 of the ablation catheter 1 reaches the target tissue.

[0083] Furthermore, the ablation catheter 1 also includes a target electrode. When the ablation catheter 1 is ablated, the target electrode is used to generate a mapping signal, and the mapping signal is used to determine the degree of ablation of the ablation catheter 1. The target electrode includes any two of the first electrode 121, the third electrode 123, and the fourth electrode 124. Furthermore, when the ablation catheter 1 reaches the target tissue and starts ablation, the external device can obtain the mapping signal of the target electrode of the ablation catheter 1, and display the mapping signal through a visual interface. The operator determines the degree of ablation of the ablation catheter 1 through the mapping signal. In more detail, the operator can determine whether the mapping signal reaches a predetermined signal value. If the mapping signal reaches the predetermined signal value, it is determined that the ablation catheter 1 has completed ablation.

[0084] Preferably, the target electrode includes a first electrode 121 and a fourth electrode 124, the fourth electrode 124 is arranged between the first electrode 121 and the second electrode 122, and the fourth electrode 124 is closer to the first electrode 121 than the third electrode 123. When the ablation catheter 1 is ablated, the current will flow through the target tissue, thereby mixing interference signals into the mapping signal generated by the target electrode, causing interference when the external device acquires the mapping signal. Among them, the longer the length of the current flowing through the target tissue, the more interference signals are mixed into the mapping signal generated by the target electrode, that is, the accuracy of judging the ablation degree of the ablation catheter 1 by the mapping signal is worse. Therefore, in this embodiment, the fourth electrode 124 is arranged between the first electrode 121 and the second electrode 122, which can shorten the length of the current flowing through the target tissue, that is, the accuracy of the mapping signal generated by the target electrode is higher, so that the treatment effect of the ablation catheter 1 can be better judged according to the mapping signal.

[0085] The ablation process of the ablation catheter 1 is preferably:

[0086] Step 1: First, the ablation catheter 1 is introduced into a blood vessel of the human body, and the operator controls the ablation catheter 1 to reach the target tissue.

[0087] Step 2: The positioning module 3 obtains the position information of the first electrode 121, the third electrode 123 and the fourth electrode 124, and the adhesion detection module 4 obtains the deformation form and deformation amount of the second electrode 122 according to the position information of the first electrode 121, the third electrode 123 and the fourth electrode 124, and obtains the adhesion force between the first electrode 121 and the target tissue, and displays the adhesion force between the first electrode 121 and the target tissue in a visual interface.

[0088] Step 3: The operator obtains the real-time contact force of the first electrode 121 through the visual interface and determines the contact degree between the first electrode 121 and the target tissue. When it is determined that the ablation catheter 1 is in place, a release signal is sent to the pulse ablation module 2.

[0089] After receiving the release signal, the pulse ablation module 2 sends a high-voltage pulse to the electrode assembly 12, and the ablation catheter 1 starts to ablate the target tissue.

[0090] Step 4: During the ablation process, the external device acquires the mapping signal of the target electrode in real time and displays it through a visual interface. The operator acquires the mapping signal and determines the ablation degree of the ablation catheter 1 .

[0091] The present application has no particular restrictions on the type of control device, which can be hardware that performs logical operations, such as a single-chip microcomputer, a microprocessor, a programmable logic controller (PLC) or a field-programmable gate array (FPGA), or a software program, functional module, function, object library or dynamic link library that implements the above functions based on hardware. It should be known how to specifically implement the communication between the control device and other devices.

[0092] In summary, the present invention allows the second electrode 122 in the ablation catheter 1 to partially expand outward, so that the second electrode 122 has a larger surface area. When the ablation catheter 1 is ablated, compared with the traditional ring electrode, the second electrode 122 that can expand outward can shunt the current and will not produce the current electric field concentration effect, so the second electrode 122 can carry a larger current, and can also avoid the second electrode 122 from generating arc heat release and the side effects such as carbonization, thrombosis and bubbles on the surface of the target tissue, thereby ensuring that the ablation catheter 1 can be used in a high-voltage pulse electric field. At the same time, since the first electrode 121 is used to ablate the target tissue, when the first electrode 121 and the second electrode 122 are used in conjunction with each other, the current flowing through the first electrode 121 can also be larger (that is, the current intensity flowing through the first electrode 121 is increased), and the increase in the current of the first electrode 121 can enhance the ablation depth of the target tissue by the ablation catheter 1.

[0093] The present invention can also assist the ablation treatment of the ablation catheter 1 by setting a control device to follow and obtain the degree of contact between the first electrode 121 and the target tissue in real time.

[0094] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the protection scope of the present invention.

Claims

1. An electrode assembly capable of transmitting energy between a device and a target tissue, the electrode assembly being capable of being disposed at a distal end of a catheter shaft, It is characterized in that The electrode assembly comprises at least a first electrode and a second electrode, the first electrode being used for ablating a target tissue, the second electrode being arranged farther away from the target tissue than the first electrode and being capable of current shunting, wherein the current shunting refers to increasing the surface area of ​​the second electrode so as to reduce the current density flowing through the second electrode, thereby increasing the current density of the first electrode used in conjunction with the second electrode; The working state of the second electrode can be switched between a contracted state and an expanded state. When the second electrode is in the contracted state, at least a portion of the second electrode contracts inwardly; when the second electrode is in the expanded state, at least a portion of the second electrode expands outwardly.

2. The electrode assembly according to claim 1, It is characterized in that At least a portion of the second electrode extends along the longitudinal direction of the catheter shaft and is distributed around the circumference of the catheter shaft.

3. The electrode assembly according to claim 1 or 2, It is characterized in that The electrode assembly further includes a third electrode, which is disposed farther away from the target tissue than the second electrode and can be used to detect a working state of the second electrode.

4. The electrode assembly according to claim 3, It is characterized in that The electrode assembly further includes a fourth electrode, which is disposed closer to the target tissue than the second electrode, and the fourth electrode can be used in conjunction with the third electrode to detect a working state of the second electrode.

5. The electrode assembly according to claim 4, It is characterized in that The fourth electrode is located between the first electrode and the second electrode.

6. The electrode assembly according to any one of claims 1, 2, 4 and 5, It is characterized in that The second electrode includes at least one linear electrode, and at least a portion of at least one linear electrode is switchable between the contracted state and the expanded state.

7. The electrode assembly according to any one of claims 1, 2, 4 and 5, It is characterized in that The second electrode includes a plurality of first sub-electrodes, which extend longitudinally along the catheter axis and are distributed circumferentially around the catheter axis; the second electrode also includes a plurality of second sub-electrodes, which extend transversely along the catheter axis, and both ends of each second sub-electrode are respectively connected to two adjacent first sub-electrodes; the second sub-electrodes are V-shaped.

8. An ablation catheter, It is characterized in that The invention comprises a catheter shaft and an electrode assembly as claimed in any one of claims 1 to 7, wherein the electrode assembly is arranged at the distal end of the catheter shaft.

9. The ablation catheter according to claim 8, It is characterized in that The catheter shaft includes a first catheter shaft and a second catheter shaft, the distal end of the second electrode is connected to the first catheter shaft, the proximal end of the second electrode is connected to the second catheter shaft, and the relative movement of the first catheter shaft and the second catheter shaft can enable the second electrode to switch between the contracted state and the expanded state.

10. The ablation catheter according to claim 9, It is characterized in that The first catheter shaft is inserted into the second catheter shaft. The ablation catheter further comprises a sleeve. The sleeve is sleeved on the first catheter shaft. The distal end of the second electrode is fixedly connected to the sleeve.

11. The ablation catheter according to claim 10, It is characterized in that The first electrode and / or a fourth electrode of the electrode assembly that is disposed closer to the target tissue than the second electrode is fixed to the sleeve.

12. An ablation system, It is characterized in that It comprises a pulse ablation module and an ablation catheter as claimed in any one of claims 8 to 11, wherein the pulse ablation module is used to emit high-voltage pulses to the ablation catheter.

13. The ablation system according to claim 12, It is characterized in that Also included is a control device capable of detecting a working state of the second electrode.

14. An ablation system, It is characterized in that The invention comprises a pulse ablation module and an ablation catheter, wherein the pulse ablation module is used to emit high-voltage pulses to the ablation catheter, wherein the ablation catheter comprises a catheter shaft and an electrode assembly, wherein the electrode assembly comprises at least a first electrode, a second electrode and a third electrode, wherein the first electrode is used to ablate target tissue, and the second electrode is a structure capable of elastic deformation and can be used for current shunting, wherein the current shunting refers to increasing the surface area of ​​the second electrode so as to reduce the current density flowing through the second electrode, thereby increasing the current density of the first electrode used in conjunction with the second electrode; The second electrode is arranged farther away from the target tissue than the first electrode, and the third electrode is arranged farther away from the target tissue than the second electrode. The ablation system also includes a control device, which can detect the working state of the second electrode and obtain the degree of contact between the first electrode and the target tissue according to the working state.

15. The ablation system according to claim 13 or 14, It is characterized in that The control device includes a positioning module and an abutment detection module. The positioning module can obtain position information reflecting the working state of the second electrode, and the abutment detection module can determine the degree of abutment between the first electrode and the target tissue according to the position information.

16. The ablation system according to claim 15, It is characterized in that The location information includes any of the following location information: position information of the first electrode and a third electrode disposed farther from the target tissue than the second electrode; position information of a third electrode and a fourth electrode disposed closer to the target tissue relative to the second electrode; Position information of the first electrode, the third electrode and the fourth electrode.

17. The ablation system according to claim 16, It is characterized in that The working state includes a deformation form and a deformation amount of the second electrode, and the deformation form reflects a compression or bending state of the second electrode.

18. The ablation system according to any one of claims 13, 14, 16, and 17, It is characterized in that The control device can determine whether the contact force between the electrode assembly and the target tissue reaches a preset value. If it is determined that the contact force reaches the preset value, the control device sends a pulse release signal to the pulse ablation module.

19. The ablation system according to any one of claims 13, 14, 16, and 17, It is characterized in that The ablation system further includes a visualization interface, which can display the degree of contact between the first electrode and the target tissue.

20. The ablation system of claim 15, It is characterized in that The positioning module can obtain the position information of the first electrode, establish a heart computer model according to the position information of the first electrode, and display the heart computer model on the visualization interface of the ablation system.

Images