An ablation device

Abstract

The present invention relates to the field of medical devices, and particularly to an ablation device, which includes a delivery tube, a support body, a channel tube and an ablation assembly. The distal end of the delivery tube is connected to the support body. The support body includes a plurality of support members. The channel tube is sleeved inside the delivery tube and is connected to the support members. The ablation assembly is disposed inside the channel tube. Moreover, an auxiliary orientation structure is further included. The auxiliary orientation structure includes a connecting member disposed at the distal end of the channel tube and a mating member that is movably connected to the connecting member. The mating member is sleeved outside the ablation assembly, and the ablation assembly drives the mating member to move the mating member relative to the connecting member. The ablation assembly of the present invention can stably move axially back and forth, puncture at the target position, and can also provide a supporting force for the ablation section. After the ablation assembly completes ablation at one location, it can also perform ablation at other locations.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and particularly relates to an ablation device. Background Art

[0002] Hypertrophic cardiomyopathy is a common autosomal dominant genetic cardiovascular disease, with an incidence rate of approximately 1:500 in the general population and a mortality rate of approximately 1.4%-2.2%. It is the most common cause of sudden death in young people and athletes. The main manifestation of hypertrophic cardiomyopathy is hypertrophy of one or more segments of the left ventricle, and the general diagnostic criterion is a thickness greater than or equal to 15 mm. When the anterior mitral leaflet moves forward during systole and adheres to the interventricular septum, causing stenosis or even obstruction of the left ventricular outflow tract, that is, when the left ventricular outflow tract pressure difference is too large, it is called obstructive hypertrophic cardiomyopathy.

[0003] Currently, the treatment strategy for obstructive hypertrophic cardiomyopathy is to expand the left ventricular outflow tract to reduce the pressure difference and relieve its obstruction. The commonly used treatment methods mainly include drug treatment, septal myectomy, and septal alcohol ablation. However, these methods have disadvantages such as high surgical risks or poor treatment effects. In recent years, some new technologies for treating obstructive hypertrophic cardiomyopathy have also been disclosed. For example, a radiofrequency ablation needle is used to enter the myocardium through the apical approach for radiofrequency ablation, or a radiofrequency ablation electrode is used to enter the heart cavity through the vascular approach for radiofrequency ablation. Although these methods have certain advantages compared with traditional methods, however, these ablation devices with radiofrequency ablation function have relatively large trauma and low controllability during ablation operations. The spatial structure in the heart is complex. The ablation needle has undergone multiple bends before reaching the lesion, and it is difficult for the distal end of the ablation needle to directly penetrate into the target position. The ablation needle does not receive sufficient supporting force, and there is no structure to guide the ablation needle.

[0004] Therefore, how to design an ablation system that can simultaneously meet the requirements of guiding the direction of the ablation needle and ensuring that the ablation needle stably penetrates into the target tissue is an urgent problem to be solved currently. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide an ablation device for the problems that it is difficult to adjust the direction of the ablation needle in the heart and the ablation needle is difficult to accurately penetrate straight into the lesion.

[0006] The purpose of the present invention is achieved through the following solutions:

[0007] An ablation device includes a delivery tube, a support body, a channel tube, and an ablation assembly. The distal end of the delivery tube is connected to the support body. The support body includes a plurality of support members. The channel tube is sleeved inside the delivery tube and is connected to the support members. The ablation assembly is disposed inside the channel tube. Moreover, it further includes an auxiliary orientation structure. The auxiliary orientation structure includes a connecting member disposed at the distal end of the channel tube and a mating member movably connected to the connecting member. The mating member is sleeved outside the ablation assembly, and the ablation assembly drives the mating member to move the mating member relative to the connecting member.

[0008] The object of the present invention can also be further achieved by the following technical solutions:

[0009] In one embodiment, the ablation assembly includes at least two ablation needles arranged side by side. The ablation needle includes an ablation section and a bendable section. The ablation section is disposed at the outermost distal end of the ablation needle. Moreover, during pre-installation, the ablation section is sleeved inside the mating member, and the mating member does not extend beyond the connecting member.

[0010] In one embodiment, the ablation section and the mating member are successively exposed from inside the connecting member. The ablation section penetrates into the lesion tissue, and the mating member contacts the lesion tissue. Moreover, the materials of the ablation section and the bendable section are different, and the frictional force of the bendable section is greater than that of the ablation section. The bendable section is more likely to drive the mating member to move.

[0011] In one embodiment, the ablation section is made of a metal material, and the bendable section is made of a polymer material.

[0012] In one embodiment, the connecting member directly abuts against the target tissue. The ablation section enters the target tissue, and the mating member does not come out of the connecting member.

[0013] In one embodiment, the ablation section is completely exposed outside the connecting member, and the ablation section has not yet contacted the target tissue. The ablation section continues to move distally until the bendable section contacts the mating member. When the bendable section moves distally, it drives the mating member to move distally. Thus, the ablation section can still maintain its original straight path and penetrate towards the tissue.

[0014] In one embodiment, the mating member includes a double-track channel and a sliding block, and the connecting member includes a limiting track. The sliding block slides inside the limiting track. Moreover, the double-track channel is in clearance fit connection with the ablation assembly, and the ablation assembly drives the mating member to move through frictional force.

[0015] In one embodiment, the sliding block is on both sides of the double-track channel relative to the double-track channel.

[0016] In one embodiment, the frictional force between the ablation component and the mating part is greater than the frictional force between the connecting piece and the mating part.

[0017] In one embodiment, it further includes a control member connected to the distal end of the support body. The support body is in an olive shape in its natural state, and when the control member is pulled, the support body becomes in a pumpkin shape.

[0018] In one embodiment, when the control member is pulled, the support body changes from an elongated shape to a thick and round shape.

[0019] In one embodiment, the support body is a mesh structure.

[0020] In one embodiment, the support member is in a Y shape, a V shape or a straight shape; and the support body further includes a reinforcing unit disposed in the middle thereof. The diameter of the reinforcing unit is the maximum diameter of the support body, and the support member is connected to the reinforcing unit.

[0021] In one embodiment, the support member includes an arc section and an abutting section. The distal end of the channel tube is connected to the abutting section, and the two are movably connected by a thin string or filament; and in the natural state, the connecting piece at least partially extends beyond the outer peripheral surface of the abutting section.

[0022] In one embodiment, the channel tube is bent within the support body, and the channel tube is in a J shape.

[0023] In one embodiment, the connecting piece is disposed below the reinforcing unit.

[0024] In another embodiment, the connecting piece is disposed above the reinforcing unit.

[0025] In one embodiment, a collecting device for collecting electrical signals is further disposed on the support member for judging whether the support body touches the conduction bundle in the heart.

[0026] In one embodiment, it further includes a recovery device disposed outside the delivery tube. The recovery device includes an outer tube and an inner tube. The inner tube is disposed at the distal end of the outer tube; and the two are movably connected, and the inner tube can rotate relative to the outer tube.

[0027] In one embodiment, the outer tube further includes an annular wrapping member, and the annular wrapping member is in a mating connection with the groove of the inner tube. The inner tube can only rotate relative to the outer tube and cannot perform axial movement relative to the outer tube.

[0028] In one embodiment, the proximal end of the support body is fixedly connected to the proximal end of the delivery tube. By pulling the delivery tube, the support body enters the inner tube along with the delivery tube. Subsequently, keeping the outer tube stationary and rotating the delivery tube, the inner tube and the support body will also rotate accordingly. Moreover, by pushing the delivery tube distally, the support body returns to the left ventricle again, and at this time, the tissue position where the ablation assembly can ablate has been changed.

[0029] In one embodiment, the two ablation needles move axially together or separately. And when the fitting moves distally along with the ablation needle, the distal end of the ablation needle will penetrate into the target tissue, and the fitting moves to fit with the target tissue without entering it.

[0030] In one embodiment, the ablation needles move together before entering the lesion tissue, and after penetrating into the tissue, the ablation needles are pushed separately to form an ablation range adapted to the patient's lesion.

[0031] In one embodiment, the distal end of the ablation section acts on the interventricular septum tissue in the heart.

[0032] In one embodiment, the surface of the ablation section is coated with a radiopaque material.

[0033] Compared with the prior art, the advantages of the present invention are as follows:

[0034] 1. In the prior art, before ablating the ventricular septum position, it is necessary to adapt to the shape of the aorta and then bend towards the ventricular septum, or pass through the foramen ovale and the mitral valve to reach the left ventricle. Therefore, at least two bends are required near the lesion. As a result, in addition to the ablation segment at the distal end for ablation, other parts of the ablation needle need to bend to adapt to the blood vessels. Therefore, it is difficult to determine and fix the puncture direction of the ablation segment, and the length of the ablation segment is limited. It is difficult for the ablation segment to penetrate directly into the target tissue. The ablation device of the present application solves the above problems. First, a deformable support is provided at the distal end of the delivery tube. The ablation assembly enters the left ventricle along with the support, and the ablation assembly is pre-installed in the channel tube. The connecting piece of the channel tube is connected to the support piece of the support. The support piece provides a supporting force for the channel tube. In the state where the support and the channel tube remain stationary, the ablation assembly can move stably back and forth axially, that is, puncture at the target position. On the other hand, since the shapes of the left ventricles of different patients are different, after the support deforms to fit the left ventricle, the connecting piece at the distal end of the channel tube may not touch the ventricular septum tissue. To prevent the flexible section from bending after being exposed and causing the two ablation needles not to be parallel, the present application designs an auxiliary orientation structure. The connecting piece will form a movable connection with the mating piece. Since the mating piece is hard, the mating piece will be sleeved on the flexible section after following the ablation assembly and moving distally, preventing the flexible section from bending, and the mating piece will abut against the surface of the ventricular septum, further providing a supporting force for the ablation segment. The design concept is ingenious and of great clinical significance.

[0035] 2. Different from the prior art, the ablation segment and the mating piece, the flexible segment and the mating piece, and the mating piece and the connecting piece can all move relative to each other. The advantage of this design is that after the support deforms to the target shape, the connecting piece may fit the ventricular septum tissue or there may be a certain distance from the ventricular septum tissue. When there is no need to make up the gap, the mating piece will not come out. When it is necessary to make up the gap, the mating piece will be brought out by the flexible segment / ablation segment; moreover, the mating piece will not affect the axial forward or backward movement of the ablation segment throughout the process.

[0036] 3. Different from the prior art, the materials of the ablation segment and the flexible segment are different. The friction of the flexible segment is greater than that of the ablation segment. The flexible segment is more likely to drive the movement of the mating piece. Thus, when the ablation segment does not need the mating piece, the mating piece will not move translationally, and the mating piece will only move when needed.

[0037] 4. Different from the prior art, the support member includes an arc segment and a abutting segment. The distal end of the channel tube is connected to the abutting segment, and the two are movably connected by a thin string or filament. The advantages of this design are as follows: First, the arc segment can perfectly transition between the delivery tube and the abutting segment, enabling the support body to be smoothly and silkily retrieved. Second, the structure of the abutting segment is more complex than that of the arc segment and can provide stronger support force. The distal end of the channel tube is abutted by the abutting segments on both the left and right sides, enabling the channel tube to bend gradually and stably when it bends, without being overly flexible.

[0038] 5. Different from the prior art, the support body of the present application further includes a strengthening unit disposed in the middle thereof. The strengthening unit is the part with the greatest strength of the support body, which can ensure that the support body is stuck in the left ventricle after being released, guaranteeing the stability of the channel tube and the puncture of the ablation needle.

[0039] 6. Different from the prior art, the present application also provides a retrieval device for changing the ablation area by retrieving the support body, rotating the support body, and releasing the support body. Thus, after the ablation component completes ablation at one location, ablation at other locations can also be performed.

[0040] The embodiments of the present application can achieve other beneficial technical effects that are not listed one by one. Some of these other technical effects may be described hereinafter and can be expected and understood by those skilled in the art after reading the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] By referring to the following description in conjunction with the drawings, these features and advantages of the above embodiments and other features and advantages, as well as the manner of achieving them, will become more apparent and the embodiments of the present application can be better understood. In the drawings:

[0042] Figure 1 is a schematic diagram of the overall structure of the ablation device of the present invention.

[0043] Figure 2 is a schematic cross-sectional view of the ablation device of the present invention.

[0044] Figure 3 is Figure 2 an enlarged view of part A in

[0045] Figure 4 is Figure 2 an enlarged view of part B in

[0046] Figure 5 is Figure 2 an enlarged view of part C in

[0047] Figure 6 is a schematic diagram of the auxiliary orientation structure of the present invention.

[0048] Figure 7 is a working schematic diagram of the auxiliary orientation structureFigure 1 .

[0049] Figure 8 Schematic diagram of the working of the auxiliary orientation structure Figure 2 .

[0050] Figure 9 Schematic diagram of the working of the auxiliary orientation structure Figure 3 .

[0051] Figure 10 Schematic diagram of the support body being recycled to the recycling device Figure 1 .

[0052] Figure 11 Schematic diagram of the support body being recycled to the recycling device Figure 2 .

[0053] Figure 12 Schematic diagram of the support body being recycled to the recycling device.

[0054] Figure 13 Schematic diagram of the working process of the ablation device of the present invention Figure 1 .

[0055] Figure 14 Schematic diagram of the working process of the ablation device of the present invention Figure 2 .

[0056] Figure 15 Schematic diagram of the working process of the ablation device of the present invention Figure 3 .

[0057] Figure 16 Schematic diagram of the working process of the ablation device of the present invention Figure 4 .

[0058] Figure 17 Schematic diagram of the working process of the ablation device of the present invention Figure 5 .

[0059] Figure 18 Schematic diagram of the working process of the ablation device of the present invention Figure 6 .

[0060] The names of the parts referred to by the numbers in the drawings are as follows: 1 - delivery tube, 2 - support body, 21 - support member, 211 - arc section, 212 - abutting section, 22 - reinforcement unit, 3 - channel tube, 4 - ablation assembly, 41 - ablation needle, 411 - ablation section, 412 - bendable section, 5 - auxiliary orientation structure, 51 - connecting member, 52 - mating member, 521 - double-rail channel, 522 - sliding block, 6 - control member, 7 - recycling device, 71 - outer peripheral tube, 711 - annular wrapping member, 72 - inner peripheral tube, 721 - groove. Detailed implementation manners

[0061] In the following description of the drawings and the specific embodiments, details of one or more embodiments of the present application will be set forth. From these descriptions, the drawings, and the claims, other features, objects, and advantages of the present application will be apparent.

[0062] It should be understood that the illustrated and described embodiments are not limited in application to the details of the construction and arrangement of components set forth in the following description or illustrated in the drawings. The illustrated embodiments may be other embodiments and can be implemented or carried out in various ways. Each example is provided by way of explanation rather than limitation of the disclosed embodiments. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present application without departing from the scope or essence of the disclosure of the present application. For example, features illustrated or described as part of one embodiment can be used with another embodiment to still produce additional embodiments. Accordingly, the disclosure of the present application covers such modifications and variations that fall within the scope of the appended claims and their equivalent elements.

[0063] Similarly, it can be understood that the phrases and terms used herein are for the purpose of description and should not be considered restrictive. The use of "including", "comprising", or "having" and their variants herein is intended to open - endedly include the items listed thereafter, their equivalents, and additional items.

[0064] The present application will be described in more detail below with reference to different embodiments and examples of several aspects of the present application.

[0065] In the present application, the term "proximal" or "proximal side" refers to the end or side closer to the surgical operator, and the term "distal" or "distal side" refers to the end or side farther from the surgical operator.

[0066] Embodiment 1

[0067] As Figure 1 and Figure 2 shown, an ablation device is illustrated, which includes a delivery tube 1, a support 2, a channel tube 3, and an ablation assembly 4. The distal end of the delivery tube 1 is connected to the support 2. The support 2 includes several support members 21. The channel tube 3 is sleeved inside the delivery tube 1. The channel tube 3 is connected to the support members 21. The ablation assembly 4 is disposed inside the channel tube 3. And, it further includes an auxiliary orientation structure 5. The auxiliary orientation structure 5 includes a connecting member 51 disposed at the distal end of the channel tube 3 and a mating member 52 that forms a movable connection with the connecting member 51. The mating member 52 is sleeved outside the ablation assembly 4. As Figure 5 shown, the ablation assembly 4 drives the mating member 52 such that the mating member 52 moves relative to the connecting member 51.

[0068] The composition and connection manner of each component in this embodiment will be described in detail below with reference to the accompanying drawings:

[0069] In this embodiment, the ablation assembly 4 includes at least two ablation needles 41 arranged side by side. The ablation needle 41 includes an ablation section 411 and a bendable section 412. The ablation section 411 is arranged at the distal end of the ablation needle 41, as Figure 5 shown; and during pre-installation, the ablation section 411 is sleeved in the fitting 52, and the fitting 52 does not extend beyond the connecting member 51, as Figure 7 shown.

[0070] In this embodiment, the ablation section 411 and the fitting 52 are successively exposed from the connecting member 51. The ablation section 411 penetrates into the diseased tissue, and the fitting 52 contacts the diseased tissue; and the materials of the ablation section 411 and the bendable section 412 are different. The frictional force of the bendable section 412 is greater than that of the ablation section 411, and the bendable section 412 is more likely to drive the fitting 52 to move.

[0071] In this embodiment, the ablation section 411 is made of a metal material, and the bendable section 412 is made of a polymer material.

[0072] In this embodiment, the ablation section 411 is completely exposed outside the connecting member 51, and the ablation section 411 has not yet contacted the target tissue. The ablation section 411 continues to move distally until the bendable section 412 contacts the fitting 52, as Figure 8 shown. When the bendable section 412 moves distally, it drives the fitting 52 to move distally. Thus, the ablation section 411 can still maintain its original straight path and penetrate towards the tissue, as Figure 9 shown.

[0073] In this embodiment, the fitting 52 includes a double-track channel 521 and a sliding block 522. The connecting member 51 includes a limiting track. The sliding block 522 slides in the limiting track, as Figure 6 shown; and the double-track channel 521 is in clearance fit connection with the ablation assembly 4, and the ablation assembly 4 drives the fitting 52 to move through frictional force.

[0074] In this embodiment, the sliding block 522 is on both sides of the double-track channel 521 relative to the double-track channel 521.

[0075] In this embodiment, it further includes a control member 6 connected to the distal end of the support body 2. The support body 2 is in an olive shape in its natural state, as Figure 10 shown. When the control member 6 is pulled, the support body 2 is in a pumpkin shape, as Figure 11As shown; pulling the control member 6, the support body 2 changes from an elongated shape to a thick and round shape.

[0076] In this embodiment, the support member 21 is in a Y shape, a V shape or a straight shape; and, the support body 2 further includes a reinforcing unit 22 disposed in the middle thereof. The diameter of the reinforcing unit 22 is the maximum diameter of the support body 2, and the support member 21 is connected to the reinforcing unit 22.

[0077] In this embodiment, the support member 21 includes an arc section 211 and an abutting section 212. The distal end of the channel tube 3 is connected to the abutting section 212, and the two are movably connected by a thin string or filament; and, in the natural state, the connecting member 51 at least partially extends beyond the outer peripheral surface of the abutting section 212, as Figure 1 and 2 shown.

[0078] In this embodiment, the left and right sides of the distal end of the channel tube 3 are respectively connected to the abutting section 212, and the abutting section 212 provides a supporting force for the bending of the channel tube 3.

[0079] In this embodiment, the channel tube 3 is bent within the support body 2, and, the channel tube 3 is in a J shape.

[0080] In this embodiment, the connecting member 51 is disposed below the reinforcing unit 22.

[0081] In this embodiment, a collecting device for collecting electrical signals is further disposed on the support member 21, for judging whether the support body 2 touches the conduction bundle in the heart.

[0082] In this embodiment, a recovery device 7 is further included and disposed outside the delivery tube 1. The recovery device 7 includes an outer tube 71 and an inner tube 72. The inner tube 72 is disposed at the distal end of the outer tube 71; and, the two are movably connected, and the inner tube 72 can rotate relative to the outer tube 71, as Figure 2 and Figure 3 shown.

[0083] In this embodiment, the outer tube 71 further includes an annular wrapping member 711. The annular wrapping member 711 is in mating connection with the groove 721 of the inner tube 72. The inner tube 72 can only rotate relative to the outer tube 71 and cannot perform axial movement relative to the outer tube 71, as Figure 3 shown.

[0084] In this embodiment, the proximal end of the support body 2 is fixedly connected to the proximal end of the delivery tube 1, as Figure 4 shown. Pulling the delivery tube 1, the support body 2 enters the inner tube 72 along with the delivery tube 1, as Figure 12As shown, subsequently, keep the peripheral tube 71 stationary, rotate the delivery tube 1, and the internal tube 72 and the support 2 will rotate accordingly. Moreover, push the delivery tube 1 towards the distal end, the support 2 returns to the left ventricle again, and at this time, the tissue position where the ablation assembly 4 can ablate has been changed.

[0085] In this embodiment, the two ablation needles 41 move axially together or separately. Moreover, when the fitting 52 moves towards the distal end along with the ablation needle 41, the distal end of the ablation needle 41 will penetrate into the target tissue, and the fitting 52 moves to fit the target tissue without entering it.

[0086] In this embodiment, the ablation needles 41 move together before entering the lesion tissue, and after penetrating into the tissue, the ablation needles 41 are pushed separately to form an ablation range adapted to the patient's lesion.

[0087] The working process steps of the present invention are as follows:

[0088] (1) The ablation device enters the right atrium through the femoral vein approach, passes through the foramen ovale channel, and then enters the left atrium. After bending adjustment, it enters the left ventricle, as Figure 13 shown;

[0089] (2) Retract the recovery device 7 to expose the support 2 and the delivery tube 1, as Figure 14 shown;

[0090] (3) Adjust the control member 6 to deform the support 2 and adjust the position of the support 2 until the support 2 is in the target position. At this time, the strengthening unit 22 is in contact with the left ventricle, as Figure 15 shown; (4) Push the channel tube 3, the channel tube 3 bends to determine the puncture direction of the ablation needle 41, as Figure 16 shown;

[0091] (5) Push the ablation needle 41, the ablation section 411 and the fitting 52 come out of the connector 51 in sequence. The ablation section 411 penetrates into the interventricular septum tissue, and the fitting 52 closely adheres to the interventricular septum tissue, as Figure 17 shown;

[0092] (6) Push the ablation needles 41 separately to adjust the distance between the two ablation sections 411 to form an ablation range and perform ablation;

[0093] (7) Retract the ablation needle 41, the ablation section 411 and the fitting 52 are both recovered into the connector 51, and operate the recovery device 7 to recover the support 2, as Figure 18 shown;

[0094] (8) Rotate the delivery tube 1, then release the support 2, and repeat step (2) until the ablation work at this time is completed, and recover the ablation device.

[0095] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. An ablation device, comprising a delivery tube, a support body, a channel tube and an ablation component, characterized in that: The distal end of the delivery tube is connected to the support body, the support body includes a plurality of support members, the channel tube is sleeved in the delivery tube, the channel tube is connected to the support member, and the ablation assembly is arranged in the channel tube; and further includes an auxiliary orientation structure, the auxiliary orientation structure includes a connecting member arranged at the distal end of the channel tube and a matching member that forms a movable connection with the connecting member, the matching member is sleeved outside the ablation assembly, and the ablation assembly drives the matching member so that the matching member moves relative to the connecting member; The support member includes an arc segment and a supporting segment, the distal end of the channel tube is connected to the supporting segment, and the two are movably connected by a thin rope or a thin wire; and in a natural state, the connecting member at least partially exceeds the outer peripheral surface of the supporting segment; The ablation device further comprises a recovery device arranged outside the delivery tube, the recovery device comprises an external tube and an internal tube, the internal tube is arranged at the distal end of the external tube; and the two are movably connected, the internal tube can rotate relative to the external tube; The proximal end of the support body is fixedly connected to the proximal end of the delivery tube. When the delivery tube is pulled, the support body enters the inner tube along with the delivery tube. Then, the outer tube is kept stationary and the delivery tube is rotated, and the inner tube and the support body also rotate accordingly.

2. The ablation device according to claim 1, characterized in that: The ablation assembly comprises at least two ablation needles arranged side by side, wherein the ablation needle comprises an ablation section and a bendable section, wherein the ablation section is arranged at the farthest end of the ablation needle; and when pre-installed, the ablation section is sleeved in the matching piece, and the matching piece does not extend beyond the connecting piece.

3. The ablation device according to claim 2, characterized in that: The ablation segment and the matching piece are exposed from the connecting piece in sequence, the ablation segment penetrates into the lesion tissue, and the matching piece contacts the lesion tissue; moreover, the ablation segment and the bendable segment are made of different materials, the friction force of the bendable segment is greater than that of the ablation segment, and the bendable segment can more easily drive the matching piece to move.

4. The ablation device according to claim 1, characterized in that: The matching piece includes a double-track channel and a sliding block, the connecting piece includes a limiting track, and the sliding block slides in the limiting track; and the double-track channel is loosely connected to the ablation component, and the ablation component drives the matching piece to move through friction.

5. The ablation device according to claim 1, characterized in that: It also includes a control member connected to the distal end of the support body. The support body is in a rugby shape in a natural state, and the support body is in a pumpkin shape when the control member is pulled.

6. The ablation device according to claim 1, characterized in that: The support member is Y-shaped, V-shaped or straight-shaped; and the support body also includes a reinforcing unit arranged in the middle thereof, the diameter of the reinforcing unit is the maximum diameter of the support body, and the support member is connected to the reinforcing unit.

7. The ablation device according to claim 6, characterized in that: The enhancement unit and / or the support member is also provided with a collection device for collecting electrical signals.

8. The ablation device according to claim 2, characterized in that: The two ablation needles move axially together or individually; and when the matching piece moves toward the distal end along with the ablation needle, the distal end of the ablation needle will pierce the target tissue, and the matching piece moves to fit the target tissue without entering.

Images