Ablation catheter

Abstract

The embodiment of the utility model provides an ablation catheter, and belongs to the technical field of ablation. The ablation catheter comprises a catheter body, the catheter body comprises an inner-layer catheter body and an outer-layer catheter body, the inner-layer catheter body is provided with a cavity extending in the axial direction, a wire is arranged on the peripheral side of the inner-layer catheter body, and the outer-layer catheter body is formed on the peripheral side of the inner-layer catheter body so as to wrap the wire. The ablation catheter is smaller in size, puncture wounds of a patient can be reduced, and the risk of complications is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ablation technology, in particular, to an ablation catheter. BACKGROUND

[0002] Catheter ablation is used for the treatment of various arrhythmias, tumors and the like. The ablation catheter plays a role of energy transmission and target lesion positioning in the operation, and is a tool for implementing ablation. For the ablation catheter, the distal end of the catheter is generally a multi-electrode, and the lumen of the catheter is generally a multi-lumen structure. Taking a seven-lumen catheter as an example, the center of the catheter has a cavity, and a plurality of cavities such as six cavities are distributed around the center. The central cavity of the catheter is used for passing a guide wire, and the six cavities around the catheter are respectively used for passing a plurality of electrode wires such as six electrode wires. The catheter of this structure has a large diameter, and the production process is complex, and problems such as eccentricity and damage often occur. CONTENT OF THE UTILITY MODEL

[0003] The ablation catheter provided by the embodiments of the present application has a smaller size, can reduce the puncture wound of the patient, and reduce the risk of complications.

[0004] The ablation catheter provided by the embodiments of the present application includes a catheter, the catheter includes an inner layer tube and an outer layer tube, the inner layer tube has a cavity extending in the axial direction, and a wire is arranged on the outer peripheral side of the inner layer tube. The outer layer tube is formed on the outer peripheral side of the inner layer tube to cover the wire.

[0005] In the present scheme, the catheter is divided into an inner layer tube and an outer layer tube, the wire is arranged on the outer side of the inner layer tube, and the outer layer tube is formed on the outer side of the inner layer tube. The inner layer tube, the wire and the outer layer tube are integrated, compared with the seven-lumen catheter in the prior art, the catheter is formed in a split structure, the outer layer tube is formed on the inner layer tube and the wire, so that there is no gap between the wire and the outer layer tube in the radial direction of the catheter. The wall thickness of the outer layer tube is thicker at the part where the wire is offset, and the wall thickness of the outer layer tube is thinner at the part corresponding to the wire. The wall thickness of the outer layer tube is distributed in a wave shape along the circumferential direction of the outer layer tube. The minimum wall thickness of the outer layer tube can be reduced while the structural strength of the outer layer tube is effectively ensured, so that the diameter of the catheter is smaller, the puncture wound of the patient is reduced, and the risk of complications is reduced.

[0006] In some embodiments, the ablation catheter further includes an ablation assembly, the ablation assembly includes an electrode support and an electrode, the electrode support is arranged at the distal end of the catheter, and the electrode is arranged on the electrode support. The wire is arranged through the catheter in the axial direction of the catheter, one end of the wire is electrically connected with the electrode, and the other end of the wire is electrically connected with a handle located at the proximal end of the catheter.

[0007] In the technical solution, the electrode support is located at the distal end of the catheter, and the electrode is arranged on the electrode support. After the distal end of the ablation catheter is placed in the ablation area of the natural cavity of the human body, such as a blood vessel, the expansion of the electrode support can drive the electrode to contact the blood vessel wall, thereby achieving ablation of the target area.

[0008] In some embodiments, the number of electrodes is multiple, and the number of wires is multiple groups, and the number of groups of wires corresponds to the number of electrodes one by one.

[0009] In the technical solution, the number of electrodes is multiple, and the multiple electrodes on the electrode support can cooperate together to achieve synchronous ablation of multiple ablation points of the target ablation area, thereby improving the ablation range and ablation efficiency. The number of wires corresponds to the number of electrodes one by one, and each electrode corresponds to a group of wires.

[0010] In some embodiments, the multiple groups of wires are distributed along the circumference of the inner tube.

[0011] In the technical solution, the multiple groups of wires are distributed along the circumference of the inner tube, and the wires corresponding to each electrode are distributed in the circumference of the catheter. This not only makes the distribution of wires more neat and reasonable, but also reduces the risk of signal interference between the wires corresponding to two electrodes.

[0012] In some embodiments, along the axial direction of the inner tube, the wires are spirally arranged on the outer circumferential side of the inner tube.

[0013] In the technical solution, the wires are spirally arranged on the outer circumferential side of the inner tube. Compared with the linear arrangement of the wires along the axial direction of the inner tube, the spiral arrangement increases the length of the wires, correspondingly increases the distribution density of the wires in the unit area of the inner tube, makes the outer wall of the catheter more dense, and increases the uniformity and strength of the outer wall of the catheter.

[0014] In some embodiments, the catheter further comprises a filling wire, which is arranged on the outer circumferential side of the inner tube and located between the adjacent two groups of wires.

[0015] In the technical solution, the filling wire is arranged between the adjacent two groups of wires, which can increase the filling density between the outer tube and the inner tube, thereby increasing the strength of the catheter.

[0016] In some embodiments, along the axial direction of the catheter, the catheter comprises a first tube segment and a second tube segment, the first tube segment is arranged closer to the electrode support than the second tube segment, and the elastic modulus of the first tube segment is smaller than that of the second tube segment.

[0017] In the technical solution, the elastic modulus of the first tube segment of the catheter is smaller than that of the second tube segment, that is, the first tube segment of the catheter is softer than the second tube segment. The first tube segment is located at the distal end of the catheter, so that the catheter moves more smoothly in the cavity in the body.

[0018] In some embodiments, the electrode is a multi-layered compression structure.

[0019] In the above technical solution, the electrode is a multi-layered compression structure, which is simple to manufacture and process.

[0020] In some embodiments, the electrode comprises a first pressure sensor layer, a compressible dielectric layer, a second pressure sensor layer and a substrate layer which are sequentially stacked.

[0021] In the above technical solution, the substrate layer can serve as an electrode layer to achieve ablation function on the ablation area. When the substrate layer of the electrode is in contact with the blood vessel wall, the second pressure sensor layer is deformed by extruding the compressible dielectric layer after being pressed, the distance between the first pressure sensor layer and the second pressure sensor layer changes, and the capacitance, resistance and charge change. The wall adhesion effect of the electrode can be determined according to the capacitance, resistance and charge change, so as to monitor the adhesion degree of the electrode support at the distal end of the catheter to the blood vessel wall, so that the ablation effect is better, and the phenomenon of excessive expansion and damage to the blood vessel wall is less likely to occur.

[0022] In some embodiments, the electrode further comprises a temperature sensor layer, which is arranged between the second pressure sensor layer and the substrate layer.

[0023] In the above technical solution, the electrode is integrated with the temperature sensor layer, so that the electrode also has the function of temperature measurement, and the ablation temperature can be monitored when the ablation assembly ablates the target ablation area, so as to improve the treatment effect.

[0024] In some embodiments, a shielding layer is arranged between the temperature sensor layer and the substrate layer.

[0025] In the above technical solution, the shielding layer can shield and insulate the signal interference between the substrate layer and the temperature sensor layer.

[0026] In some embodiments, the electrode is at least one of a Z-shaped electrode, a spiral electrode, a tubular electrode or a sheet electrode.

[0027] In the above technical solution, the shape of the electrode can be selected according to actual conditions. The sheet electrode and the Z-shaped electrode have a larger adhesion area to the blood vessel and a better ablation effect. The spiral electrode and the tubular electrode are convenient for the design and installation of the sensor.

[0028] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 Structure diagram of the ablation catheter provided for some embodiments of the present application;

[0031] Figure 2 Sectional view of the catheter in the ablation catheter provided for some embodiments of the present application;

[0032] Figure 3 Sectional view of the catheter with two lumens in the ablation catheter provided for some embodiments of the present application;

[0033] Figure 4 Sectional view of the catheter with three lumens in the ablation catheter provided for some embodiments of the present application;

[0034] Figure 5 Sectional view of the catheter with four lumens in the ablation catheter provided for some embodiments of the present application;

[0035] Figure 6 Half-sectional view of the catheter in the ablation catheter provided for some embodiments of the present application;

[0036] Figure 7 Sectional view of the electrode in the ablation catheter provided for some embodiments of the present application;

[0037] Figure 8 Structure diagram of the electrode in the ablation catheter provided for some embodiments of the present application, which is a Z-shaped electrode;

[0038] Figure 9 Structure diagram of the electrode in the ablation catheter provided for some embodiments of the present application, which is a sheet-shaped electrode;

[0039] Figure 10 Structure diagram of the electrode in the ablation catheter provided for some embodiments of the present application, which is a spiral-shaped electrode.

[0040] Icon: 10 - catheter; 11 - inner tube; 111 - lumen; 12 - outer tube; 121 - first portion; 122 - second portion; 13 - filler wire; 14 - first tube segment; 15 - second tube segment; 20 - electrode carrier; 21 - wire; 211 - first wire core; 212 - second wire core; 22 - electrode; 221 - first pressure sensor layer; 222 - compressible dielectric layer; 223 - second pressure sensor layer; 224 - first temperature sensor layer; 225 - second temperature sensor layer; 226 - base layer; 227 - shield layer; 23 - carrier wire; 30 - guidewire; 100 - ablation catheter. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0043] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the embodiments of the present application, it should be noted that the indicated position or location relationship is based on the position or location relationship shown in the drawings, or the position or location relationship commonly placed when the product of the present application is used, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular position, be constructed and operated in a particular position, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In the description of the present application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected, can be directly connected, can also be indirectly connected through an intermediate medium, and can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] The present application provides an ablation catheter, please refer to Figures 1 to 6 The ablation catheter 100 comprises a catheter 10, the catheter 10 comprises an inner layer tube 11 and an outer layer tube 12, the inner layer tube 11 has a cavity 111 extending in the axial direction, the outer peripheral side of the inner layer tube 11 is provided with a wire 21, and the outer layer tube 12 is formed on the outer peripheral side of the inner layer tube 11 to cover the wire 21.

[0047] In the present scheme, by dividing the catheter 10 into the inner layer tube 11 and the outer layer tube 12, winding the wire 21 on the outer side of the inner layer tube 11, and forming the outer layer tube 12 on the outer side of the inner layer tube 11, the inner layer tube 11, the wire 21 and the outer layer tube 12 can be integrated. Compared with the catheter 10 with seven cavities in the prior art, the catheter 10 is formed in a split structure in the present scheme, the outer layer tube 12 is formed on the inner layer tube 11 and the wire 21, so that there is no gap between the wire 21 and the outer layer tube 12 in the radial direction of the catheter 10, thereby reducing the space of the inner layer tube 11 and the outer layer tube 12 in the radial direction, and the wall thickness of the outer layer tube 12 is thicker at the part away from the wire 21, and the wall thickness of the outer layer tube 12 is thinner at the part corresponding to the wire 21. Along the circumferential direction of the outer layer tube 12, the wall thickness of the outer layer tube 12 is distributed in a wavy manner. Under the condition of effectively ensuring the structural strength of the outer layer tube 12, the minimum wall thickness of the outer layer tube 12 can be reduced, so that the diameter of the catheter 10 is smaller, the puncture wound of the patient is reduced, and the risk of complications is reduced.

[0048] The outer layer tube 12 can be formed on the inner layer tube 11 in the form of extrusion molding, or in the form of sleeve bonding and adhesion. In the present embodiment, the outer layer tube 12 is extrusion molded on the inner layer tube 11.

[0049] The material of the outer layer tube 12 can be Pebax, TPU or PA, and the outer layer tube 12 can be single-layer or double-layer. The material of the inner layer tube 11 can be self-lubricating material, such as PTFE, and the inner layer tube 11 can also be single-layer or double-layer. In the present embodiment, the inner layer tube 11 and the outer layer tube 12 are both single-layer tubes, the inner diameter of the inner layer tube 11 is not less than 0.7mm, and the outer diameter of the inner layer tube 11 is not less than 0.9mm. The wire 21 is wound on the inner layer tube 11, and the outer layer tube 12 wraps the wire 21 and is extrusion molded.

[0050] The inner tube 11 can have one or more cavities 111. For example, Figure 2 As shown, when the inner tube 11 has a single lumen 111, the lumen 111 allows the guidewire 30 to pass through, and the guidewire 30 is used to guide the catheter 10 into smaller lumen branches. Of course, when the inner tube has multiple lumen 111, in addition to allowing the guidewire 30 to pass through, the multiple lumen 111 can also be used for the delivery of contrast agents, saline, or drugs, increasing the functionality of the catheter 10. Figure 3 , Figure 4 and Figure 5 The diagrams illustrate cases where the inner tube has two, three, or four cavities.

[0051] In some embodiments, such as Figure 1 The ablation catheter 100 also includes an ablation assembly, which includes an electrode support 20 and an electrode 22. Figure 1 (Not shown in the diagram), an electrode holder 20 is disposed at the distal end of the catheter 10, and an electrode 22 is disposed on the electrode holder 20; a lead wire 21 is disposed along the axial direction of the catheter 10 and passes through the catheter 10, one end of the lead wire 21 being electrically connected to the electrode 22, and the other end of the lead wire 21 being electrically connected to a handle located at the proximal end of the catheter 10. With the electrode holder 20 located at the distal end of the catheter 10 and the electrode 22 disposed on the electrode holder 20, after the distal end of the ablation catheter 100 is inserted into a natural body cavity, such as the ablation area of ​​a blood vessel, the expansion of the electrode holder 20 can cause the electrode 22 to contact the blood vessel wall, achieving ablation of the target area.

[0052] The body's natural cavities can be bronchi, bile ducts, esophagus, gastrointestinal tract, urinary and reproductive tracts, or blood vessels. Taking blood vessels as an example, refractory hypertension can be treated by ablation of the renal sympathetic nerves or the external carotid nerves; type 2 diabetes can be treated by ablation of nerves near the liver; and the function of metabolic organs can be affected by ablation of the sympathetic nerves that innervate internal organs such as the liver, pancreas, and gastrointestinal tract. In addition, pain can be relieved by ablation of nerves outside peripheral blood vessels.

[0053] The cavities in the following embodiments all use blood vessels as an example, and the application scenario is the ablation of renal sympathetic nerves to treat refractory hypertension. This is only to facilitate the understanding of the technology by those skilled in the art, and is not to exclude the application of the technical solution of this application to other scenarios. It should be understood that each embodiment of this application can be applied to a type of scenario, and those skilled in the art can directly apply it to multiple treatment scenarios under the instructions of the specification. Applying the technical solution of this application to multiple similar scenarios is within the protection scope and implementation method of this application.

[0054] The electrode stent 20 can have various structural forms, and can be a shape memory alloy stent, a tubular cutting stent, or a mesh tubular stent. The electrode stent 20 further includes stent wires 23, and the electrodes 22 are attached to or disposed on the stent wires 23.

[0055] The electrode stent 20 has a contracted state and an expanded state, and one or more electrodes 22 are attached to the middle section of the electrode stent 20. The guide wire refers to a wire-like component that is provided through the catheter 10 and the electrode stent 20. The guide wire can be provided at the distal end of the electrode stent 20 and extend into the blood vessel branch.

[0056] The electrode stent 20 and the catheter 10 can be connected in various ways, such as laser welding, adhesion, or press riveting.

[0057] The proximal end refers to the end close to the operator, and the distal end refers to the end away from the operator. For example, the proximal end and the distal end of the catheter 10, the proximal end of the catheter 10 is provided with a handle, and the distal end of the catheter 10 is provided with the electrode stent 20. The proximal end and the distal end are opposite ends in the axial direction of the catheter 10. The electrodes 22 are provided on the electrode stent 20, and the ablation catheter 100 contacts the blood vessel wall of the target ablation area through the electrodes 22 to achieve the ablation function. The number of electrodes 22 can be one or more, for example, the number of electrodes 22 can be two, four, six, or eight, etc. The specific number of electrodes 22 can be determined according to the actual situation. Multiple electrodes 22 are distributed in the circumferential and axial directions of the electrode stent 20.

[0058] With the number of electrodes 22 being six as an example, the catheter 10 in the prior art is a seven-lumen catheter including a central lumen and six lumens located at the periphery of the central lumen, and each lumen at the periphery of the catheter 10 is provided for a group of wires 21 to pass through. Generally, the design size of the lumen has a certain design allowance, and the design size of the lumen needs to be larger than the outer diameter of the wire 21 to allow the wire 21 to pass through. After the wire 21 passes through the lumen, there is a gap between the wire 21 and the inner wall of the lumen, and each tube wall has a certain thickness, so that the diameter of the catheter 10 is large after the multiple lumens of the catheter 10 are stacked. In the present scheme, the wire 21 is wound around the outer wall of the inner layer tube 11, and the outer layer tube 12 is formed on the outer side of the inner layer tube 11 and the wire 21 by extrusion molding, so that a part of the outer layer tube 12 contacts the outer wall of the inner layer tube 11, and another part of the outer layer tube 12 contacts the wire 21. The wire 21 does not have a gap in the radial direction with the inner layer tube 11 and the outer layer tube 12, and does not need to be provided with a corresponding lumen separately for the wire 21, so that the space of the inner layer tube 11 and the outer layer tube 12 in the radial direction can be reduced, thereby enabling the size of the catheter 10 to be smaller and the puncture wound of the patient to be reduced. In addition, along the circumference of the outer layer tube 12, the wall thickness of the outer layer tube 12 gradually changes in a wave shape, and the minimum wall thickness of the outer layer tube 12 can be controlled to be small, so that the size of the catheter 10 is smaller under the premise of ensuring the stability of the structure of the catheter 10.

[0059] It can be understood that, with reference to Figure 2 , along the circumference of the outer layer tube 12, the outer layer tube 12 includes a first portion 121 and a second portion 122, and the first portion 121 and the second portion 122 are arranged alternately; the first portion 121 is arranged in close contact with the wire 21, and the second portion 122 is arranged in close contact with the outer wall of the inner layer tube 11. The wall thickness of the first portion 121 of the outer layer tube 12 is smaller than the wall thickness of the second portion 122, that is, along the circumference of the outer layer tube 12, the wall thickness of the outer layer tube 12 is not equal.

[0060] In some embodiments, the number of electrodes 22 is a plurality, and the number of wires 21 is a plurality of groups, and the number of groups of wires 21 corresponds to the number of electrodes 22 one by one. By setting the number of electrodes 22 to be a plurality, the plurality of electrodes 22 on the electrode support can cooperate together to realize synchronous ablation of a plurality of ablation points of the target ablation area, thereby improving the ablation range and ablation efficiency. The number of wires 21 corresponds to the number of electrodes 22 one by one, and each electrode 22 corresponds to a group of wires 21.

[0061] The number of the wire cores in each group of the conductive wires 21 can be one or more. When the number of the wire cores in each group of the conductive wires 21 is more than one, the number of the wire cores in each group of the conductive wires 21 can be two, three, four or the like, which can be determined according to actual conditions. Of course, the multiple wire cores in each group of the conductive wires 21 are distributed along the circumference of the inner tube 11 in sequence instead of being stacked along the radial direction of the inner tube 11, which can effectively control the radial dimension of each group of the conductive wires 21, and meanwhile, the multiple wire cores are all in contact with the outer wall of the inner tube 11, which can improve the installation stability of the conductive wires 21 in the catheter 10 compared with the case that the multiple wire cores are stacked along the radial direction.

[0062] For example, when the number of the wire cores in each group of the conductive wires 21 is two, the two wire cores can be distributed in sequence and in contact with each other along the circumference of the inner tube 11, or the two wire cores can have a certain spacing along the circumference of the inner tube 11. The specific number of the wire cores can be determined according to the actual function of the electrode 22. In addition to the case that each group of the conductive wires 21 corresponds to one electrode 22, the case that multiple electrodes 22 correspond to one group of the conductive wires 21 is also possible.

[0063] In some embodiments, please refer to Figure 2 The multiple groups of the conductive wires 21 are distributed along the circumference of the inner tube 11. The multiple groups of the conductive wires 21 are distributed along the circumference of the inner tube 11, and the conductive wires 21 corresponding to each electrode 22 are distributed along the circumference of the catheter 10, which not only makes the distribution of the conductive wires 21 more reasonable, but also reduces the risk of signal interference between the conductive wires 21 corresponding to two electrodes 22.

[0064] The multiple groups of the conductive wires 21 can have a gap along the circumference of the inner tube 11, i.e. the multiple groups of the conductive wires 21 are distributed with a spacing along the circumference of the inner tube 11. Of course, it should be understood by those skilled in the art that the multiple groups of the conductive wires 21 can also have no gap along the circumference of the inner tube 11. In this embodiment, the multiple groups of the conductive wires 21 are distributed with a spacing along the circumference of the inner tube 11.

[0065] In addition, the conductive wires 21 can be arranged in various ways on the outer circumferential side of the inner tube 11, for example, the conductive wires 21 can be arranged in a straight line along the axial direction of the inner tube 11 on the outer circumferential side of the inner tube 11, or the conductive wires 21 can be arranged in a spiral on the outer circumferential side of the inner tube 11. The specific arrangement of the conductive wires 21 on the inner tube 11 can be determined according to actual conditions.

[0066] In some embodiments, please refer to Figure 2 and Figure 6The wire 21 is spirally arranged on the outer circumferential side of the inner layer tube 11 along the axial direction of the inner layer tube 11. Compared with the linear arrangement of the wire 21 along the axial direction of the inner layer tube 11, the spiral arrangement of the wire 21 increases the length of the wire 21, and accordingly increases the distribution density of the wire 21 in the unit area of the inner layer tube 11, so that the outer wall of the catheter 10 is more compact, and the uniformity and strength of the outer wall of the catheter 10 are increased.

[0067] In some embodiments, referring to Figure 2 and Figure 6 The catheter 10 further comprises a filling wire 13 arranged on the outer circumferential side of the inner layer tube 11 and located between the adjacent two groups of wires 21. By arranging the filling wire 13 between the adjacent two groups of wires 21, the filling density between the outer layer tube 12 and the inner layer tube 11 is increased, and the strength of the catheter 10 is increased.

[0068] The material of the filling wire 13 can be copper.

[0069] In some embodiments, referring to Figure 1 The catheter 10 comprises a first tube segment 14 and a second tube segment 15 along the axial direction of the catheter 10, the first tube segment 14 is arranged closer to the electrode support 20 than the second tube segment 15, and the elastic modulus of the first tube segment 14 is smaller than that of the second tube segment 15. The elastic modulus of the first tube segment 14 of the catheter 10 is smaller than that of the second tube segment 15, that is, the first tube segment 14 of the catheter 10 has greater elasticity than the second tube segment 15, and the first tube segment 14 is located at the distal end position of the catheter 10, so that the catheter 10 moves more smoothly in the cavity in the body.

[0070] The elastic modulus of the first tube segment 14 is smaller than that of the second tube segment 15, which can be that the material of the first tube segment 14 is different from that of the second tube segment 15, and the material of the first tube segment 14 is softer than that of the second tube segment 15. Of course, the first tube segment 14 and the second tube segment 15 can be of the same material, and in this case, the wall thickness of the first tube segment 14 can be set to be smaller than that of the second tube segment 15, so that the elastic modulus of the first tube segment 14 is smaller than that of the second tube segment 15. Alternatively, the material of the first tube segment 14 can be softer than that of the second tube segment 15, and the wall thickness of the first tube segment 14 can also be smaller than that of the second tube segment 15, so that the elastic modulus of the first tube segment 14 is smaller than that of the second tube segment 15.

[0071] In some embodiments, the outer diameter of the catheter 10 is 1.25mm-2.2mm. Limiting the outer diameter of the catheter 10 to 1.25mm-2.2mm can smoothly pass through a 4-7Fr sheath, and the catheter 10 can be selected for puncture surgery through the femoral artery or radial artery, so that the puncture trauma is smaller and the complications are reduced.

[0072] In some embodiments, the electrode 22 is a multi-layered structure. By adopting the electrode 22 as a multi-layered structure, the electrode 22 is simple to manufacture and easy to implement.

[0073] In some embodiments, referring to Figure 7 , the electrode 22 comprises a first pressure sensor layer 221, a compressible dielectric layer 222, a second pressure sensor layer 223 and a substrate layer 226 which are sequentially stacked.

[0074] The substrate layer 226 can serve as an electrode layer to achieve the ablation function on the ablation area. By arranging the compressible dielectric layer 222 between the first pressure sensor layer 221 and the second pressure sensor layer 223, when the substrate layer 226 of the electrode 22 abuts against the blood vessel wall, the second pressure sensor layer 223 is pressed to deform the compressible dielectric layer 222, the distance between the first pressure sensor layer 221 and the second pressure sensor layer 223 changes, and the capacitance, resistance and charge change. The abutting effect of the electrode 22 is determined according to the capacitance, resistance and charge change, so as to monitor the abutting degree of the electrode support at the distal end of the catheter 10 and the blood vessel wall, so that the ablation effect is better, and the phenomenon of excessive expansion and damage to the blood vessel wall is less likely to occur.

[0075] The substrate layer 226 can be electrically connected to the handle through the first core 211 in the wire 21 to achieve the transmission of the ablation signal. The second pressure sensor layer 223 and / or the first pressure sensor layer 221 can be electrically connected to the handle through the second core 212 in the wire 21 to achieve the transmission of the pressure signal.

[0076] In some embodiments, referring to Figure 7 , the electrode 22 further comprises a temperature sensor layer arranged between the second pressure sensor layer 223 and the substrate layer 226. By integrating the temperature sensor layer in the electrode 22, the electrode 22 also has the function of temperature measurement, which can monitor the temperature during ablation of the target ablation area by the ablation assembly, and the ablation temperature can be monitored to improve the treatment effect.

[0077] The temperature sensor layer is electrically connected to the handle through the third core. The temperature sensor layer can include a first temperature sensor layer 224 and a second temperature sensor layer 225, and the second temperature sensor layer 225 is arranged closer to the substrate layer 226 than the first temperature sensor layer 224. The first temperature sensor layer 224 is a copper layer, and the second temperature sensor layer 225 is a constantan layer, and a temperature measuring thermocouple is formed between the first temperature sensor layer 224 and the second temperature sensor layer 225. Of course, the first temperature sensor layer 224 and the second temperature sensor layer 225 can also be connected through a via hole to form a temperature measuring thermocouple.

[0078] The electrode 22 is mainly made of FPC and is formed by pressing multiple materials. The main materials of the electrode 22 include an insulating layer, copper, an insulating layer and copper-nickel. In order to increase the conductivity and developability of the electrode 22, platinum, tungsten, iridium and other developable metals can be added to the electrode 22. The alloy electrode 22 can also contain electrochemically active components: gold, indium, silicon, tin, gallium and combinations thereof.

[0079] In some embodiments, a shielding layer 227 is arranged between the temperature sensor layer and the substrate layer 226. The shielding layer 227 can shield the insulation and prevent signal interference between the substrate layer 226 and the temperature sensor layer.

[0080] Of course, the shielding layer 227 can also be arranged between the second pressure sensor layer 223 and the temperature sensor layer. Alternatively, the shielding layer 227 includes a first shielding layer and a second shielding layer, the first shielding layer is arranged between the second pressure sensor layer 223 and the temperature sensor layer, and the second shielding layer is arranged between the temperature sensor layer and the substrate layer 226.

[0081] In some embodiments, please refer to Figure 8 , Figure 9 and Figure 10 The electrode 22 is at least one of a Z-shaped electrode, a spiral electrode, a tubular electrode or a sheet electrode. The shape of the electrode 22 can be selected according to actual conditions. The sheet electrode and the Z-shaped electrode have a larger area of adhesion to the blood vessel and have a better ablation effect. The spiral electrode and the tubular electrode are convenient for the design and installation of the sensor.

[0082] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0083] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An ablation catheter, characterized in that, include: The catheter includes an inner tube and an outer tube, the inner tube having an axially extending cavity, a wire being disposed on the outer periphery of the inner tube, and the outer tube being formed on the outer periphery of the inner tube to cover the wire.

2. The ablation catheter according to claim 1, characterized in that, The ablation catheter further includes an ablation assembly, which includes an electrode support and an electrode. The electrode support is disposed at the distal end of the catheter, and the electrode is disposed on the electrode support. A wire is disposed through the catheter along the axial direction of the catheter. One end of the wire is electrically connected to the electrode, and the other end of the wire is electrically connected to a handle located at the proximal end of the catheter.

3. The ablation catheter according to claim 2, characterized in that, The number of electrodes is multiple, and the number of wires is multiple groups, with the number of groups of wires corresponding one-to-one with the number of electrodes.

4. The ablation catheter according to claim 3, characterized in that, Multiple sets of the aforementioned conductors are distributed circumferentially along the inner tube.

5. The ablation catheter according to claim 4, characterized in that, Along the axial direction of the inner tube, the wire is spirally wound around the outer periphery of the inner tube.

6. The ablation catheter according to claim 3, characterized in that, The catheter also includes: A filler line is disposed on the outer periphery of the inner tube and located between two adjacent sets of conductors.

7. The ablation catheter according to claim 2, characterized in that, Along the axial direction of the conduit, the conduit includes a first segment and a second segment, the first segment being disposed closer to the electrode support than the second segment, and the elastic modulus of the first segment being less than that of the second segment.

8. The ablation catheter according to claim 2, characterized in that, The electrode has a multi-layer press-fit structure.

9. The ablation catheter according to claim 8, characterized in that, The electrode comprises a first pressure sensor layer, a compressible dielectric layer, a second pressure sensor layer, and a substrate layer stacked in sequence.

10. The ablation catheter according to claim 9, characterized in that, The electrode also includes a temperature sensor layer disposed between the second pressure sensor layer and the substrate layer.

11. The ablation catheter according to claim 10, characterized in that, A shielding layer is provided between the temperature sensor layer and the substrate layer.

12. The ablation catheter according to claim 2, characterized in that, The electrode is at least one of a Z-shaped electrode, a spiral electrode, a tubular electrode, or a sheet electrode.

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