A basket ablation catheter

Abstract

This utility model belongs to the field of medical device technology and discloses a basket ablation catheter, including a connector, a first basket, and a second basket. The first basket includes multiple first basket electrodes and multiple first insulating elements. Each first basket electrode is fitted with a first insulating element, and the unfitted area forms a first ablation zone. The second basket includes multiple second basket electrodes and multiple second insulating elements, which are alternately arranged circumferentially with the multiple first basket electrodes. Each second basket electrode is fitted with a second insulating element, and the unfitted area forms a second ablation zone. The first and second ablation zones are axially offset so that they do not contact each other during operation. This basket ablation catheter not only reduces energy waste but also avoids hemolysis.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a basket ablation catheter. Background Technology

[0002] Cardiac arrhythmia refers to changes in the normal heart rate or rhythm, which originate from alterations in the generation or conduction of electrical activity within the myocardium. Under normal circumstances, the sinoatrial node generates electrical impulses that stimulate the heart to beat via a specific conduction network. Cardiac arrhythmias can occur due to changes in impulse generation or conduction.

[0003] Currently, catheter-based cardiac ablation has become a common treatment for arrhythmias. Early cardiac ablation techniques mainly used radiofrequency (RF) energy, causing coagulative necrosis of tissue through thermal effects. In recent years, with technological advancements, pulsed field ablation (PFA) has gradually become a research hotspot due to its advantages such as being non-thermal, having high tissue selectivity, and short ablation time. PFA uses high-intensity, short-duration electric field pulses to create irreversible electroporation (IRE) on the cell membrane, destroying the cell membrane and causing cell death, thereby blocking abnormal electrical pathways.

[0004] However, current ablation catheters cannot target the target tissue with specific discharges based on the catheter's fit, resulting in wasted energy. Furthermore, to improve the success rate, operators often need to discharge the same target tissue multiple times. Repeated discharges of the blood to electrodes that are not in contact with the target tissue may cause hemolysis. Utility Model Content

[0005] The purpose of this application is to provide a basket ablation catheter that not only reduces energy waste but also avoids hemolysis problems.

[0006] The technical solution provided in this application is as follows:

[0007] A basket ablation catheter, comprising:

[0008] Connectors;

[0009] The first basket includes a plurality of first basket electrodes and a plurality of first insulating members arranged at circumferential intervals. The distal ends of the plurality of first basket electrodes converge together, and the proximal ends are respectively connected to the connector. Each first basket electrode is fitted with a first insulating member, and the area without the first insulating member forms a first ablation zone.

[0010] The second basket includes a plurality of second basket electrodes and a plurality of second insulating members arranged at intervals along the circumference. The distal ends of the plurality of second basket electrodes converge together, and the proximal ends are respectively connected to the connector. The plurality of second basket electrodes and the plurality of first basket electrodes are arranged alternately along the circumference. Each second basket electrode is covered with a second insulating member, and the area without the second insulating member forms a second ablation zone.

[0011] The first ablation zone and the second ablation zone are staggered so that the first ablation zone and the second ablation zone do not come into contact when the first net basket and the second net basket are working.

[0012] In some embodiments, the central axis of the first basket coincides with the central axis of the second basket, and the distal end of the second basket is located inside the first basket.

[0013] In some embodiments, the outer edges of the cross-sectional profiles of the plurality of first basket electrodes and the plurality of second basket electrodes in the same cross-section perpendicular to the axial direction of the connector are in the same closed curve, which is elliptical, circular, hyperbolic or parabolic.

[0014] In some embodiments, the first insulating member extends from the proximal end to the middle of the first basket electrode, and the first ablation zone is located at the distal end of the first basket electrode.

[0015] The second insulating element is disposed at the proximal and distal ends of the second basket electrode, and the second ablation zone is located at the middle of the second basket electrode along the axial direction.

[0016] In some embodiments, each of the first basket electrodes has a first connecting portion at its distal end, and the plurality of first connecting portions are connected end to end in sequence, so that the distal ends of the plurality of first basket electrodes are connected as a whole.

[0017] In some embodiments, the first connecting portion includes a first arc segment, a second arc segment, and a third arc segment connected in sequence, wherein the first arc segment and the third arc segment are disposed opposite to each other, and the protrusion of the first arc segment is disposed toward the third arc segment, and the protrusion of the third arc segment is disposed toward the first arc segment.

[0018] When two adjacent first connecting parts are connected, the first arc segment of one first connecting part is connected to the third arc segment of the adjacent first connecting part.

[0019] In some embodiments, each of the second basket electrodes has a second connecting portion at its distal end, and the multiple second connecting portions are connected end to end in sequence, so that the distal ends of the multiple second basket electrodes are connected as a single unit.

[0020] In some embodiments, the second connecting portion is arc-shaped and the protrusion is disposed on the side away from the second basket electrode.

[0021] In some embodiments, the second basket electrode includes a first branch, a second branch, and a main body, wherein the proximal ends of the first branch and the second branch are respectively connected to the distal end of the main body, so that the second basket electrode forms a "Y" shape.

[0022] A first branch of one of the second basket electrodes is connected to a second branch of an adjacent second basket electrode via the second connecting portion.

[0023] In some implementations, multiple calibration electrodes are also included;

[0024] At least one of the aforementioned measuring electrodes is provided outside each of the first insulating element or the second insulating element.

[0025] In some embodiments, a reference electrode is also included, disposed at the distal end of the connector and configured to extract far-field signals from the blood without contacting the tissue, the reference electrode extending into the first and second baskets.

[0026] In some embodiments, a connecting tube is also included, which is sleeved around the proximal ends of the first basket electrode and the second basket electrode.

[0027] In some embodiments, an annular electrode is also included, which is sleeved outside the connecting tube, and the polarity of the annular electrode is opposite to that of the first basket electrode and / or the second basket electrode.

[0028] The technical advantage of this application is that by setting a first basket and a second basket, the first basket electrode of the first basket and the second basket electrode of the second basket are alternately arranged circumferentially, and a first insulating element is set on the first basket electrode to form a first ablation zone, and a second insulating element is set on the second basket electrode to form a second ablation zone. The first ablation zone and the second ablation zone are axially offset. In actual ablation, the first ablation zone and / or the second ablation zone can be selected to ablate the target tissue according to the contact method, so as to concentrate the ablation energy on the target tissue, which not only reduces energy loss, but also reduces discharge to the blood, thereby reducing the occurrence of hemolysis. Attached Figure Description

[0029] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0030] Figure 1 This is a schematic diagram of the structure of the basket ablation catheter provided in an embodiment of this application in the deployed state;

[0031] Figure 2 This is a schematic diagram of the structure of the first basket provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the second basket provided in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the basket ablation catheter provided in the embodiment of this application in the retracted state;

[0034] Figure 5 This is a schematic diagram of the structure of the basket ablation catheter provided in this application under different attachment methods;

[0035] Figure 6 yes Figure 2 Enlarged view at point B in the middle;

[0036] Figure 7 yes Figure 3 Enlarged view at point C;

[0037] Figure 8 This is a schematic diagram of the structure of the basket ablation catheter in the deployed state according to another embodiment of this application;

[0038] Figure 9 This is a schematic diagram of the electric field distribution of the basket ablation catheter provided in this application embodiment when no annular electrode is installed;

[0039] Figure 10 This is a schematic diagram of the electric field distribution when the net basket ablation catheter is fitted with a ring electrode, as provided in the embodiments of this application.

[0040] Explanation of icon numbers:

[0041] 100. Connector; 200. First basket; 210. First basket electrode; 211. First ablation zone; 220. First insulating component; 230. First connecting part; 231. First arc segment; 232. Second arc segment; 233. Third arc segment; 300. Second basket; 310. Second basket electrode; 311. Second ablation zone; 312. First branch; 313. Second branch; 314. Main body; 320. Second insulating component; 330. Second connecting part; 400. Scale electrode; 500. Reference electrode; 600. Connecting tube; 700. Annular electrode; 800. Main tube. Detailed Implementation

[0042] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0044] To keep the drawings concise, each drawing only schematically shows the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0045] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0046] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; or they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) are relative rather than absolute when describing the structure and movement of the various components, and are not intended to limit the direction of the product during actual use.

[0048] Furthermore, in the description of this application, ordinal numbers, such as "first" and "second," are used only to distinguish related objects and should not be construed as indicating or implying the relative importance or order between related objects.

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

[0050] like Figure 1 As shown, in one or more embodiments, this disclosure provides a basket ablation catheter, including a connector 100, a first basket 200, and a second basket 300; the first basket 200 includes a plurality of first basket electrodes 210 and a plurality of first insulating members 220 arranged circumferentially, the distal ends of the plurality of first basket electrodes 210 converge together, and the proximal ends are respectively connected to the connector 100; each first basket electrode 210 is respectively covered with a first insulating member 220, and the area without the first insulating member 220 forms a first ablation zone 211.

[0051] The second basket 300 includes a plurality of second basket electrodes 310 and a plurality of second insulating members 320 arranged circumferentially. The distal ends of the plurality of second basket electrodes 310 converge together, and the proximal ends are respectively connected to the connector 100. The plurality of second basket electrodes 310 and the plurality of first basket electrodes 210 are arranged alternately in the circumferential direction. Each second basket electrode 310 is covered with a second insulating member 320, and the area without the second insulating member 320 forms a second ablation zone 311. The first ablation zone 211 and the second ablation zone 311 are staggered so that when the first basket 200 and the second basket 300 are working, the first ablation zone 211 and the second ablation zone 311 do not come into contact.

[0052] Specifically, the basket ablation catheter of this embodiment consists of two basket-shaped electrodes. Both the first basket 200 and the second basket 300 extend from the proximal end to the distal end along the axial direction of the catheter. Both the first basket 200 and the second basket 300 have a retracted state and an extended state, as shown below. Figure 1 As shown, the entire basket ablation catheter, in its unfolded state, resembles a basket or a ball shape. Figure 2 As shown, the first basket, when unfolded, is closer to a spherical shape, as... Figure 3 As shown, the second basket 300, when unfolded, is flatter, approaching an inverted pear shape. The structure of the first basket 200 and the second basket 300 in their folded state, constrained by the sheath, is as follows: Figure 4As shown, the first net basket 200 and the second net basket 300 remain in a retracted state within the sheath. After being unsheathed, the first net basket 200 and the second net basket 300 can transform into an extended state. In one example, both the first net basket 200 and the second net basket 300 are made of conductive metal material (such as shape memory alloys like nickel-titanium alloys) by cutting and heat-setting. When the first net basket 200 and the second net basket 300 are within the sheath, they remain in a retracted state under the constraint of the sheath; after being unsheathed, the first net basket 200 and the second net basket 300 automatically return to the extended state. In another example, the retraction and extension of the first net basket 200 and the second net basket 300 are achieved by operating the connecting member 100 (e.g., the axially movable connecting member 100).

[0053] like Figure 2 As shown, the first basket 200 includes a plurality of first basket electrodes 210 spaced apart circumferentially; preferably, the plurality of first basket electrodes 210 are evenly spaced apart circumferentially. The specific number of first basket electrodes 210 can be set according to actual needs, for example, it can be set to 2 to 10, preferably, the number of first basket electrodes 210 is 6. The first basket electrodes 210 are all elongated strips, and the distal ends of the plurality of first basket electrodes 210 converge together to achieve a fixed connection of the distal ends of the plurality of first basket electrodes 210. The proximal ends of the plurality of first basket electrodes 210 are respectively connected to the connector 100, and the outer wall of the connector 100 can be provided with a plurality of slots circumferentially, and the proximal ends of the plurality of first basket electrodes 210 are respectively fixed in the slots to achieve a fixed connection between the proximal ends of the plurality of first basket electrodes 210 and the connector 100. The first basket 200 also includes multiple first insulating elements 220. Each first basket electrode 210 has a first insulating element 220 fitted at the same location. The first insulating element 220 is made of insulating materials such as Pebax or TPU. The area on each first basket electrode 210 where the first insulating element 220 is not fitted forms a first ablation zone 211. The first ablation zone 211 is used to adhere to the target tissue for ablation.

[0054] like Figure 3As shown, the second basket 300 includes second basket electrodes 310 spaced apart circumferentially; preferably, multiple second basket electrodes 310 are evenly spaced apart circumferentially. The specific number of second basket electrodes 310 can be set according to actual needs, for example, it can be set to 2 to 10, preferably 6. The number of second basket electrodes 310 is the same as the number of first basket electrodes 210, so that multiple first basket electrodes 210 and multiple second basket electrodes 310 are alternately arranged circumferentially. When the first basket 200 and the second basket 300 are deployed synchronously, the second basket electrodes 310 are located in the gap between two adjacent first basket electrodes 210, so that the second basket electrodes 310 can be in contact with the target tissue. The second basket electrodes 310 are all elongated, and the distal ends of multiple second basket electrodes 310 converge together to achieve a fixed connection of the distal ends of multiple second basket electrodes 310. The proximal ends of multiple second basket electrodes 310 are respectively connected to the connector 100. Multiple slots are provided circumferentially on the outer wall of the connector 100, and the proximal ends of the multiple second basket electrodes 310 are fixed within these slots to achieve a fixed connection between the proximal ends of the multiple second basket electrodes 310 and the connector 100. The second basket 300 also includes multiple second insulating elements 320. A second insulating element 320 is fitted onto the same portion of each second basket electrode 310. The material of the second insulating element 320 is an insulating material such as Pebax or TPU. The area on each second basket electrode 310 where the second insulating element 320 is not fitted forms a second ablation zone 311, which is used to adhere to the target tissue for ablation.

[0055] like Figure 1 As shown, the first ablation region 211 and the second ablation region 311 are axially offset. For example, the first ablation region 211 is located at the distal end of the first basket electrode 210, and the second ablation region 311 is located at the proximal end of the second basket electrode 310; or the first ablation region 211 is located at the distal end of the first basket electrode 210, and the second ablation region 311 is located at the middle of the second basket electrode 310; or the first ablation region 211 is located at the proximal end of the first basket electrode 210, and the second ablation region 311 is located at the middle of the second basket electrode 310; or the first ablation region 211 is located at the proximal end of the first basket electrode 210, and the second ablation region 311 is located at the proximal end of the second basket electrode 210. 1 is located at the distal end of the second basket electrode 310; when the first basket 200 and / or the second basket 300 are working (e.g., when the contact tissue is deformed), the first ablation zone 211 will only contact the second insulating element 320 on the second basket electrode 310, and will not contact the second ablation zone 311 to cause a short circuit problem; similarly, the second ablation zone 311 will only contact the first insulating element 220 on the first basket electrode 210, and will not contact the first ablation zone 211 to cause a short circuit problem.

[0056] In this embodiment, a first ablation zone 211 is provided on the first basket electrode 210, and a second ablation zone 311 is provided on the second basket electrode 310. The basket ablation catheter can select either the first ablation zone 211 or the second ablation zone 311 to ablate the target tissue according to different attachment methods. The following description uses an example where the first ablation zone 211 is located at the distal end of the first basket electrode 210, and the second ablation zone 311 is located at the middle of the second basket electrode 310. Figure 5 As shown, when the basket ablation catheter is placed against the target tissue at a 45-degree angle, the first ablation zone 211 and the second ablation zone 311 simultaneously contact the target tissue, and the first basket 200 and the second basket 300 can ablate the target tissue simultaneously; when the basket ablation catheter is placed against the target tissue at a 90-degree angle, the first ablation zone 211 contacts the target tissue, and only the first basket 200 is needed for ablation; when the basket ablation catheter is placed against the target tissue at a 180-degree angle, the second ablation zone 311 contacts the target tissue, and only the second basket 300 is needed for ablation.

[0057] The double-layer basket ablation catheter of this embodiment can select different basket electrodes to ablate the target tissue according to the contact method, and the non-ablation area is insulated with an insulating component to concentrate the ablation energy on the target tissue. This not only reduces energy loss, but also reduces the discharge of the non-ablation area to the blood, thereby reducing the occurrence of hemolysis. In addition, the provision of the first insulating component 220 and the second insulating component 320 can also prevent the first basket electrode 210 and the second basket electrode 310 from short-circuiting, so as to ensure the normal use of the basket ablation catheter.

[0058] In some embodiments, such as Figure 1 As shown, the central axis of the first basket 200 coincides with the central axis of the second basket 300, and their central axes are as follows: Figure 1 Along axis A, the distal end of the second mesh basket 300 is located inside the first mesh basket 200, forming a double-layer mesh basket structure. In this embodiment, the distal ends of the second mesh basket 300 and the first mesh basket 200 are directly opposite each other, and are separated by an insulating component to prevent short circuits. It is understood that in other embodiments, the first mesh basket 200 may be located inside the second mesh basket 300, which also forms a double-layer mesh basket structure.

[0059] Furthermore, the outer edges of the cross-sectional profiles of the multiple first basket electrodes 210 and the multiple second basket electrodes 310 within the same cross-section perpendicular to the axial direction of the connector 100 lie within the same closed curve. This closed curve can be elliptical, circular, hyperbolic, or parabolic. The fact that the cross-sectional profiles of the first basket electrodes 210 and the second basket electrodes 310 lie within the same closed curve facilitates the ablation of the first basket electrodes 210 and / or the second basket electrodes 310 against the tissue.

[0060] Furthermore, such as Figures 1 to 3 As shown, when the second basket 300 is disposed within the first basket 200, the first insulating member 220 extends from the proximal end to the middle of the first basket electrode 210, and the first ablation zone 211 is located at the distal end of the first basket electrode 210; the second insulating member 320 is disposed at the proximal end and the distal end of the second basket electrode 310, and the second ablation zone 311 is located at the middle of the second basket electrode 310 along the axial direction.

[0061] The second ablation basket 300 is disposed within the first ablation basket 200. The distal end of the second ablation basket 300 is blocked by the first ablation basket 200, and the proximal end is not easily able to adhere to the target tissue. Therefore, the second ablation zone 311 on the second ablation basket electrode 310 is disposed in the middle of the second ablation basket electrode 310. To prevent the first ablation zone 211 and the second ablation zone 311 from contacting and short-circuiting, the first ablation zone 211 and the second ablation zone 311 need to be axially offset. Therefore, the first ablation zone 211 on the first ablation basket electrode 210 is located at the distal end of the first ablation basket electrode 210. When the first ablation zone 211 ablates the target tissue, the entire distal end of the first ablation basket 200 can adhere to the target tissue, thereby increasing the contact area with the target tissue and improving ablation efficiency.

[0062] In some embodiments, such as Figure 6 As shown, each first basket electrode 210 has a first connecting portion 230 at its distal end. Multiple first connecting portions 230 are connected end to end in sequence, so that the distal ends of multiple first basket electrodes 210 are connected as a single unit. The first connecting portion 230 includes a first arc-shaped segment 231, a second arc-shaped segment 232, and a third arc-shaped segment 233 connected in sequence. The first arc-shaped segment 231 and the third arc-shaped segment 233 are arranged opposite to each other, and the protrusion of the first arc-shaped segment 231 faces the third arc-shaped segment 233, and the protrusion of the third arc-shaped segment 233 faces the first arc-shaped segment 231. When two adjacent first connecting portions 230 are connected, the first arc-shaped segment 231 of one first connecting portion 230 is connected to the third arc-shaped segment 233 of the adjacent first connecting portion 230.

[0063] In this embodiment, the distal ends of the multiple first mesh basket electrodes 210 are not connected as a single unit by simple spot welding. Instead, they are connected end-to-end by a curved buffer ring consisting of a first arc segment 231, a second arc segment 232, and a third arc segment 233, forming a continuous closed loop. The curved buffer ring provides elastic deformation allowance when the first mesh basket 200 is repeatedly expanded and contracted, making the first connecting part 230 less prone to breakage and improving the service life of the first mesh basket 200. In addition, the first ablation zone 211 is located at the distal end of the first mesh basket 200. The curved buffer ring facilitates the expansion and contraction operation and increases the contact area with the target tissue, thereby improving ablation efficiency.

[0064] In some embodiments, such as Figure 7 As shown, each second basket electrode 310 has a second connecting portion 330 at its distal end. Multiple second connecting portions 330 are connected end-to-end in sequence, making the distal ends of the multiple second basket electrodes 310 integrally connected. Preferably, the second connecting portion 330 is arc-shaped with its protrusion facing away from the second basket electrode 310. The arc shape of the second connecting portion 330 facilitates the unfolding and retraction operation and also provides elastic deformation allowance when the second basket 300 is repeatedly unfolded and retracted, preventing the distal end of the second basket 300 from breaking during repeated unfolding and retraction, thus improving the service life of the second basket 300.

[0065] like Figure 3 As shown, the second basket electrode 310 includes a first branch 312, a second branch 313, and a main body 314. The proximal ends of the first branch 312 and the second branch 313 are respectively connected to the distal ends of the main body 314, so that the second basket electrode 310 forms a Y-shape. The proximal end of the main body 314 is connected to the connector 100. When the distal ends of multiple second basket electrodes 310 are connected, the first branch 312 of one second basket electrode 310 is connected to the second branch 313 of another adjacent second basket electrode 310 through the second connecting portion 330.

[0066] In this embodiment, the first branch 312, the second branch 313 and the main body 314 are connected to form a Y-shaped structure. The Y-shaped structure can not only increase the contact area with the target tissue, but also the branches of the Y-shaped structure move closer to each other when the second basket 300 is closed, which is conducive to the second basket 300 changing to a closed state.

[0067] In some embodiments, such as Figure 8As shown, the basket ablation catheter also includes multiple mapping electrodes 400; each first insulating member 220 or second insulating member 320 has at least one mapping electrode 400 for providing cardiac electrical signal detection and real-time positioning. When the first basket 200 is an outer basket, the mapping electrode 400 is disposed on the first insulating member 220; when the second basket 300 is an outer basket, the mapping electrode 400 is disposed on the second insulating member 320, so that the mapping electrode 400 can be attached to the tissue. When multiple mapping electrodes 400 are disposed on the first insulating member 220 or second insulating member 320, the multiple mapping electrodes 400 are spaced apart. For example, when two mapping electrodes 400 are disposed on the first insulating member 220, one mapping electrode 400 is disposed at the distal end of the first insulating member 220, and the other mapping electrode 400 is disposed at the proximal end of the first insulating member 220. This layout allows for precise sensing of cardiac electrical signals without interfering with the operation of the ablation electrodes, providing doctors with information on the electrical activity of cardiac tissue and helping to assess tissue health and ablation effectiveness.

[0068] Before ablation of the target tissue, the location of the target point with abnormal electrical activity is determined by the mapping electrode 400. Then, the target point is ablated. After ablation, the same location can be mapped again to determine whether the lesion has been completely isolated.

[0069] Furthermore, such as Figure 8 As shown, the basket ablation catheter also includes a reference electrode 500, which is disposed at the distal end of the connector 100 and extends into the first basket 200 and the second basket 300. In this embodiment, the reference electrode 500 extends into the internal space of the first basket 200 and the second basket 300, so that it contacts the blood but not the tissue, which facilitates the extraction of far-field signals from the blood in the electrical signal. The far-field signal extracted by the reference electrode is used as a reference for the electrical signal of the mapping electrode. In this embodiment, the reference electrode is located closer to the sensed tissue, which can effectively reduce far-field noise, obtain a clearer unipolar electrogram, and simultaneously measure voltage parameters between it and other electrodes.

[0070] In some embodiments, such as Figure 8 As shown, the basket ablation catheter also includes a connecting tube 600, which is sleeved around the proximal ends of the first basket electrode 210 and the second basket electrode 310. After the proximal ends of the first basket electrode 210 and the second basket electrode 310 are tightly fitted with the slots on the connector 100, the connecting tube 600 covers the proximal ends of the first basket electrode 210 and the second basket electrode 310, making it less likely for the proximal ends of the first basket electrode 210 and the second basket electrode 310 to fall off after being fixedly connected to the connector 100, thus improving the fixation effect of the first basket electrode 210 and the second basket electrode 310 to the connector 100.

[0071] Furthermore, the basket ablation catheter also includes a ring electrode 700, which is sleeved outside the connecting tube 600. The ring electrode 700 has the opposite polarity to the first basket electrode 210 and / or the second basket electrode 310. In this embodiment, a ring electrode 700 is added to the connecting tube 600 for pulse ablation. The first basket 200 and / or the second basket 300 can be configured as an anode or cathode in bipolar mode, forming the opposite polarity to the ring electrode 700 on the connecting tube 600. The electric field is conducted through the local tissue between the basket electrode and the ring electrode 700, eliminating the need for surface electrodes and reducing damage to non-target tissues.

[0072] in, Figure 9 A schematic diagram of the electric field distribution of the basket ablation catheter when no annular electrode 700 is installed outside the connecting tube 600; Figure 10 A schematic diagram of the electric field distribution of the basket ablation catheter when a ring electrode 700 is installed outside the connecting tube 600; as shown. Figure 10 As shown, bipolar ablation can create a relatively concentrated electric field between the two electrodes, allowing the electric field to act more precisely on the target tissue, achieving effective ablation of a specific area. This not only provides ablation effect but also reduces the impact on surrounding non-target tissues, lowers the risk of damage to healthy tissues, and improves the safety and effectiveness of the procedure.

[0073] Furthermore, such as Figure 8 As shown, the basket ablation catheter also includes a main tube 800. A connector 100 is connected to the distal end of the main tube 800, or a connecting tube 600 is connected to the distal end of the main tube 800, to achieve connection between the basket ablation catheter and the main tube 800. Irrigation channels are provided inside the connector 100 and the main tube 800 for delivering saline or other cooling media. When the first basket 200 and the second basket 300 are deployed, they have opening areas that allow blood or flushing fluid to flow through the internal cavities, preventing thrombosis.

[0074] The basket ablation catheter described in the above embodiment can switch ablation areas according to different attachment methods, concentrating ablation energy in the target tissue and avoiding energy loss. Mapping electrodes are installed on the basket electrode of the basket ablation catheter for providing cardiac electrical signal detection and real-time positioning during the procedure. The basket ablation catheter can provide both unipolar and bipolar ablation modes, improving ablation efficiency.

[0075] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0076] It should be noted that the above embodiments can be freely combined as needed. The above description is only a preferred embodiment of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A basket ablation catheter, comprising: include: Connectors; The first basket includes a plurality of first basket electrodes and a plurality of first insulating members arranged at circumferential intervals. The distal ends of the plurality of first basket electrodes converge together, and the proximal ends are respectively connected to the connector. Each first basket electrode is fitted with a first insulating member, and the area without the first insulating member forms a first ablation zone. The second basket includes a plurality of second basket electrodes and a plurality of second insulating members arranged at intervals along the circumference. The distal ends of the plurality of second basket electrodes converge together, and the proximal ends are respectively connected to the connector. The plurality of second basket electrodes and the plurality of first basket electrodes are arranged alternately along the circumference. Each second basket electrode is covered with a second insulating member, and the area without the second insulating member forms a second ablation zone. The first ablation zone and the second ablation zone are staggered so that the first ablation zone and the second ablation zone do not come into contact when the first net basket and the second net basket are working.

2. The basket ablation catheter according to claim 1, characterized in that, The central axis of the first net basket coincides with the central axis of the second net basket, and the far end of the second net basket is located inside the first net basket.

3. The basket ablation catheter according to claim 2, characterized in that, The outer edges of the cross-sectional profiles of the plurality of first basket electrodes and the plurality of second basket electrodes in the same cross-section perpendicular to the axial direction of the connector are in the same closed curve, which is elliptical, circular, hyperbolic or parabolic.

4. The basket ablation catheter according to claim 1, characterized in that, The first insulating element extends from the proximal end to the middle of the first basket electrode, and the first ablation zone is located at the distal end of the first basket electrode; The second insulating element is disposed at the proximal and distal ends of the second basket electrode, and the second ablation zone is located at the middle of the second basket electrode along the axial direction.

5. The basket ablation catheter according to claim 2, characterized in that, Each of the first basket electrodes has a first connecting part at its distal end, and the multiple first connecting parts are connected end to end in sequence so that the distal ends of the multiple first basket electrodes are connected as a whole.

6. The basket ablation catheter according to claim 5, characterized in that, The first connecting portion includes a first arc segment, a second arc segment, and a third arc segment connected in sequence. The first arc segment and the third arc segment are disposed opposite to each other, and the protrusion of the first arc segment is disposed toward the third arc segment, and the protrusion of the third arc segment is disposed toward the first arc segment. When two adjacent first connecting parts are connected, the first arc segment of one first connecting part is connected to the third arc segment of the adjacent first connecting part.

7. The basket ablation catheter according to claim 2, characterized in that, Each of the second basket electrodes has a second connecting part at its distal end, and the multiple second connecting parts are connected end to end in sequence so that the distal ends of the multiple second basket electrodes are connected as a whole.

8. The basket ablation catheter of claim 7, wherein, The second connecting part is arc-shaped and the protrusion is disposed on the side away from the second basket electrode.

9. The basket ablation catheter according to claim 7, characterized in that, The second basket electrode includes a first branch, a second branch, and a main body. The proximal ends of the first branch and the second branch are respectively connected to the distal end of the main body, so that the second basket electrode forms a "Y" shape. A first branch of one of the second basket electrodes is connected to a second branch of an adjacent second basket electrode via the second connecting portion.

10. A basket ablation catheter according to any one of claims 1-9, characterized in that, It also includes multiple calibration electrodes; At least one of the aforementioned measuring electrodes is provided outside each of the first insulating element or the second insulating element.

11. The basket ablation catheter according to claim 10, characterized in that, It also includes a reference electrode disposed at the distal end of the connector and configured to extract far-field signals from the blood without contacting the tissue, the reference electrode extending into the first and second baskets.

12. A basket ablation catheter according to any one of claims 1-9, characterized in that, It also includes a connecting tube, which is sleeved around the proximal end of the first basket electrode and the proximal end of the second basket electrode.

13. The basket ablation catheter according to claim 12, characterized in that, It also includes an annular electrode, which is sleeved outside the connecting tube, and the polarity of the annular electrode is opposite to that of the first basket electrode and / or the second basket electrode.

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