Ablation catheter and ablation system

Abstract

The invention relates to an ablation catheter and an ablation system. The ablation catheter comprises a catheter body, a perfusion assembly and a needle assembly. The perfusion assembly is arranged in the catheter body and comprises a first perfusion tube and a first liquid inlet tube, the first perfusion tube is used for allowing the needle assembly to movably penetrate through and comprises a first tube section, a second tube section and a third tube section which are sequentially connected from the near end to the far end, and the radial size of the second tube section is the largest; the first liquid inlet pipe and the first pipe section are arranged side by side in the radial direction of the filling assembly and communicate with the second pipe section. The needle assembly comprises a second liquid inlet pipe, a second infusion pipe and an ablation needle which are sequentially connected from the near end to the far end, and the second liquid inlet pipe is separated from the first liquid inlet pipe. The ablation catheter is provided with the out-needle perfusion flow channel and the in-needle perfusion flow channel which can be independently controlled, the sealing performance of the perfusion assembly is good, and the perfusion assembly can tolerate the perfusion back pressure to 0.5 Mpa.

Description

Technical Field

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

[0002] Myocardial hypertrophy is a primary heart disease, mainly caused by gene mutations. The clinical manifestations are left ventricular hypertrophy, with the largest hypertrophic part reaching more than 30 mm. Effective treatment requires extremely deep ablation lesions. At present, needle ablation catheters are usually used to ablate the hypertrophic parts of the myocardium, so that the hypertrophic parts of the myocardium can shrink, thereby alleviating the symptoms of myocardial hypertrophy. In order to ensure the ablation power and reduce scab formation and unnecessary tissue damage on the surface during ablation, different perfusion forms have gradually appeared in the market, such as intra-needle perfusion (i.e., perfusing saline into the ablation needle) and extra-needle perfusion (i.e., perfusing saline into the gap between the ablation needle and the catheter). Among them, considering the flexibility of the operation and in order to further improve the ablation efficiency, it is necessary to provide an ablation catheter that can achieve both intra-needle perfusion and extra-needle perfusion. Summary of the invention

[0003] Based on this, it is necessary to provide an ablation catheter and an ablation system to address the technical problem that the existing needle ablation catheter cannot have both the intra-needle perfusion and extra-needle perfusion functions.

[0004] An ablation catheter comprises a catheter body, an irrigation assembly and a needle assembly;

[0005] The irrigation assembly is arranged in the catheter body and includes a first irrigation tube and a first liquid inlet tube. The first irrigation tube is used for the needle assembly to movably penetrate and includes a first tube segment, a second tube segment and a third tube segment that are sequentially connected from the proximal end to the distal end. The radial dimension of the second tube segment is the largest. The first liquid inlet tube and the first tube segment are arranged side by side along the radial direction of the irrigation assembly and are connected to the second tube segment.

[0006] The needle assembly includes a second liquid inlet tube, a second perfusion tube and an ablation needle which are sequentially connected from the proximal end to the distal end, and the second liquid inlet tube is separated from the first liquid inlet tube.

[0007] In one embodiment, the first pipe segment and the third pipe segment are coaxially arranged.

[0008] In one embodiment, the distal end of the first pipe segment is coated with a first adhesive layer, and the first adhesive layer is used to seal and connect the first pipe segment, the first liquid inlet pipe and the second pipe segment;

[0009] And / or, the proximal end of the third pipe segment is coated with a second adhesive layer, and the second adhesive layer is used for sealingly connecting the third pipe segment and the second pipe segment.

[0010] In one embodiment, the distal end of the first tube segment, the distal end of the first liquid inlet tube, the proximal end of the third tube segment and the second tube segment are coated with a sealing layer;

[0011] The first adhesive layer is filled between the sealing layer, the first pipe segment, the second pipe segment and the first liquid inlet pipe, and / or the second adhesive layer is filled between the sealing layer, the third pipe segment and the second pipe segment.

[0012] In one embodiment, the first adhesive layer, and / or the second adhesive layer, and / or the sealing layer are made of transparent adhesive.

[0013] In one embodiment, the perfusion assembly further includes an auxiliary tube, which is buried in the second adhesive layer and is coaxially arranged with the first liquid inlet tube.

[0014] In one embodiment, the ablation catheter further includes a sealing member disposed between the second irrigation tube and the first tube segment, and the sealing member is used to seal a gap between the second irrigation tube and the first tube segment.

[0015] In one embodiment, the seal is a heat shrinkable material mounted on the second perfusion tube, the outer diameter of the seal after heating is less than or equal to the inner diameter of the first tube section, and the outer diameter of the seal after cooling is greater than the inner diameter of the first tube section.

[0016] In one embodiment, the inner wall of the first pipe section has a mounting groove, and the sealing member is received in the mounting groove and abuts against the outer wall of the second perfusion pipe.

[0017] In one embodiment, the proximal end of the second perfusion tube is sleeved with a support tube made of a hard material.

[0018] In one embodiment, a lubrication layer is disposed on the proximal end of the second perfusion tube.

[0019] An ablation system comprises the ablation catheter described in any one of the above items.

[0020] The above-mentioned ablation catheter and ablation system have an extra-needle perfusion channel and an intra-needle perfusion channel, and have the functions of extra-needle perfusion and intra-needle perfusion. In addition, since in the perfusion assembly, the radial dimension of the second tube segment of the first perfusion tube is the largest, that is, the radial dimension of the second tube segment is larger than the radial dimension of the first tube segment and the radial dimension of the third tube segment, on the one hand, the proximal end surface of the second tube segment can have enough space to install the first liquid inlet tube, so that the perfusion assembly does not share a liquid inlet tube with the needle assembly, then the various perfusion saline channels of the ablation catheter can be controlled according to actual clinical needs, such as controlling the flow rate, temperature or medium type of the various perfusion saline channels; on the other hand, the second tube segment can be used as a pressure buffer area to reduce the back pressure during perfusion in the first perfusion tube, and prevent the connection in the first perfusion tube from being damaged and leaking due to excessive pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a distal cross-section of an ablation catheter provided in an embodiment of the present application.

[0022] Figure 2 A schematic diagram of the cooperation between an infusion assembly and a needle assembly provided in an embodiment of the present application.

[0023] Figure 3 A longitudinal cross-sectional view of a perfusion assembly provided in an embodiment of the present application.

[0024] Figure 4 A schematic diagram of the cooperation between another perfusion assembly and a needle assembly provided in an embodiment of the present application.

[0025] The reference numerals in the accompanying drawings are described as follows:

[0026] 10. Ablation catheter; 100. Irrigation assembly; 110. First irrigation tube; 111. First tube section; 112. Second tube section; 113. Third tube section; 114. Mounting boss; 110c. Mounting groove; 120. First liquid inlet tube; 130. First adhesive layer; 140. Second adhesive layer; 150. Sealing layer; 160. Auxiliary tube; 200. Catheter body; 300. Needle assembly; 310. Second irrigation tube; 320. Ablation needle; 330. Second liquid inlet tube; 340. Support tube; 400. Seal; 500. Head electrode. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0028] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0029] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0033] It should be noted that the terms “distal end” and “proximal end” throughout the text are only used to indicate relative positional relationships. The “distal end” of a component refers to the end of the component that enters the patient's body first compared to the other end during normal operation and / or the end that is farther away from the operator, while the “proximal end” refers to the end that enters the patient's body later than the other end and / or the end that is closer to the operator.

[0034] See also Figure 1 , Figure 1 A distal cross-sectional view of an ablation catheter 10 in an embodiment of the present application is shown. The ablation catheter 10 provided in an embodiment of the present application includes a catheter body 200 and a needle assembly 300; the needle assembly 300 is axially movably disposed in the catheter body 200.

[0035] Among them, the needle assembly 300 can be as follows Figure 1 and Figure 2 As shown, it includes a second liquid inlet tube 330, a second perfusion tube 310 and an ablation needle 320 which are sequentially connected from the proximal end to the distal end. When the distal end of the ablation catheter 10 reaches the target tissue (e.g., myocardial tissue), the ablation needle 320 extends from the distal end of the catheter body 200 and punctures to reach the target location for ablation. During the ablation process, an external cooling medium (e.g., saline) enters the second perfusion tube 310 through the second liquid inlet tube 330, and then flows out from the ablation needle 320, which can cool the tissue near the target and prevent the formation of thrombus. Of course, according to different surgical requirements, other media, such as alcohol, can be injected into the second perfusion tube 310 through the second liquid inlet tube 330 to kill the cells around the target.

[0036] The material of the ablation needle 320 may be stainless steel, gold, nickel-titanium alloy or other composite materials, etc. The ablation needle 320 may be a hollow cylinder or a curved hollow tube, wherein the internal cavity of the ablation needle 320 runs through the entire length of the ablation needle 320. In some other embodiments, the side wall of the ablation needle 320 may also be provided with a plurality of micropores communicating with the internal cavity thereof.

[0037] The needle tip shape of the ablation needle 320 can be set according to the puncture force point and the toughness and puncture performance of the ablation needle 320, such as a quadrilateral or Figure 2The triangle shown, etc. In addition, the length of the ablation needle 320 can be set according to the actual ablation thickness required in clinical practice, for example, 5 mm to 20 mm.

[0038] See also Figure 1 , a head electrode 500 is provided at the distal end of the catheter body 200. When the distal end of the ablation catheter 10 is transported in the body, the ablation needle 320 is always retracted into the head electrode 500; after the distal end of the ablation catheter 10 reaches the target tissue, the ablation needle 320 extends from the head electrode 500 for ablation. It can be seen that the head electrode 500 at the distal end of the catheter body 200 can protect, support and position the ablation needle 320. Among them, the head electrode 500 can be used as a mapping electrode to collect ECG signals, find the location of the lesion, help establish a real-time three-dimensional model of the tissue, and detect the effect of surgical ablation. In some other embodiments, the head electrode 500 can also be used as an ablation electrode.

[0039] In order to ensure the mapping accuracy and effectively reduce the damage area of ​​the target tissue surface and the probability of blood clots, the temperature of the head electrode 500 should not be too high. Figures 1 to 3 As shown, the ablation catheter 10 in the present application further includes an irrigation assembly 100 disposed in the catheter body 200. The irrigation assembly 100 can be used to inject a cooling medium (e.g., saline) into the gap between the ablation needle 320 and the catheter body 200, thereby reducing the temperature of the head electrode 500. The head electrode 500 has a plurality of irrigation holes (not shown in the drawings), and the gap between the ablation needle 320 and the catheter body 200 and the irrigation holes are in communication.

[0040] Further, see Figure 2 and Figure 3 In some embodiments of the present application, the perfusion assembly 100 includes a first perfusion tube 110 and a first liquid inlet tube 120; the first perfusion tube 110 is used for the needle assembly 300 to movably penetrate and includes a first tube segment 111, a second tube segment 112 and a third tube segment 113 that are sequentially connected from the proximal end to the distal end, the second tube segment 112 has the largest radial dimension, the first liquid inlet tube 120 and the first tube segment 111 are arranged side by side along the radial direction of the perfusion assembly 100 and are connected to the proximal end of the second tube segment 112, and the first liquid inlet tube 120 is separated from the second liquid inlet tube 330.

[0041] Among them, the perfusion component 100 has an extra-needle perfusion channel, and the lumen of the first perfusion tube 110, the gap between the second tube segment 112 and the second perfusion tube 310, and the gap between the third tube segment 113 and the second perfusion tube 310 cooperate to constitute the extra-needle perfusion channel; the needle assembly 300 has an intra-needle perfusion channel, and the lumen of the second liquid inlet tube 330, the lumen of the second perfusion tube 310 and the inner cavity of the ablation needle 320 cooperate to constitute the intra-needle perfusion channel.

[0042] It should be noted that the opening diameter of the proximal end of the second tube segment 112 is smaller than the inner diameter of the proximal end of the second tube segment 112, so that the proximal end of the second tube segment 112 is connected to the first tube segment 111 and the first liquid inlet pipe 120; the opening diameter of the distal end of the second tube segment 112 is smaller than the inner diameter of the distal end of the second tube segment 112, so that the distal end of the second tube segment 112 is connected to the third tube segment 113.

[0043] In addition, the "radial dimension" herein includes the inner diameter and the outer diameter, that is, the inner diameter and the outer diameter of the second tube segment 112 are both the largest. In order to ensure that the ablation catheter 10 can be transported in the blood vessel, the outer diameter of the second tube segment 112 is within 2.6 mm.

[0044] It can be seen that the ablation catheter 10 in the application has an extra-needle perfusion channel and an intra-needle perfusion channel, and has the functions of extra-needle perfusion and intra-needle perfusion. In addition, in the perfusion component 100, the radial dimension of the second tube segment 112 of the first perfusion tube 110 is the largest, that is, the radial dimension of the second tube segment 112 is larger than the radial dimension of the first tube segment 111 and the radial dimension of the third tube segment 113. On the one hand, the proximal end surface of the second tube segment 112 can have enough space to install the first liquid inlet tube 120, so that the perfusion component 100 does not share a liquid inlet tube with the needle component 300. Then, the various perfusion saline solutions of the ablation catheter 10 can be controlled according to actual clinical needs, such as controlling the flow rate, temperature or medium type of the various perfusion saline solutions; on the other hand, the second tube segment 112 can be used as a pressure buffer area to reduce the back pressure during perfusion in the first perfusion tube 110, so as to prevent damage and leakage at the connection inside the first perfusion tube 110 due to excessive pressure.

[0045] See also Figure 3 The first tube segment 111 can be coaxially arranged with the third tube segment 113. Such an arrangement can prevent the needle assembly 300 from being stuck or tilted during the assembly process with the perfusion assembly 100. The second tube segment 112 can also be coaxially arranged with the first tube segment 111 and the third tube segment 113.

[0046] See also Figure 3 The distal end of the first pipe section 111 may be coated with a first adhesive layer 130, and the first adhesive layer 130 is used to seal the first pipe section 111, the first liquid inlet pipe 120 and the second pipe section 112. The first adhesive layer 130 can ensure the connection strength and sealing performance between the first pipe section 111, the first liquid inlet pipe 120 and the second pipe section 112.

[0047] Likewise, see Figure 3 The proximal end of the third pipe segment 113 may be coated with a second adhesive layer 140, and the second adhesive layer 140 is used to seal the third pipe segment 113 and the second pipe segment 112. The second adhesive layer 140 can ensure the connection strength and sealing performance between the third pipe segment 113 and the second pipe segment 112.

[0048] The first adhesive layer 130 and the second adhesive layer 140 may be transparent adhesives, such as photosensitive adhesives or epoxy resin adhesives. After the transparent adhesives are cured, it is convenient for production and processing personnel to check whether the internal fixed structure of the first perfusion tube 110 meets the design requirements, such as whether the first tube section 111 and the third tube section 113 are coaxially arranged.

[0049] Further, see Figure 3 The distal end of the first tube segment 111, the distal end of the first liquid inlet pipe 120, the proximal end of the third tube segment 113 and the second tube segment 112 are coated with a sealing layer 150; the first adhesive layer 130 is filled between the sealing layer 150, the first tube segment 111, the second tube segment 112 and the first liquid inlet pipe 120, and / or the second adhesive layer 140 is filled between the sealing layer 150, the third tube segment 113 and the second tube segment 112. The sealing layer 150 can further improve the sealing performance of the perfusion component 100 by cooperating with the first adhesive layer 130 and the second adhesive layer 140, so that the perfusion component 100 can withstand a higher perfusion back pressure during the perfusion process.

[0050] The sealing layer 150 may use glue with good sealing performance, such as photosensitive glue or epoxy resin glue. After the glue is cured, it is also convenient for production and processing personnel to check whether the internal fixed structure of the first perfusion tube 110 meets the design requirements.

[0051] It should be noted that a portion of the circumference of the sealing layer 150 is in contact with the inner wall of the catheter body 200, and a gap exists between the other portion of the circumference of the sealing layer 150 and the inner wall of the catheter body 200. The gap is used for the passage of components such as the wire protective tube and the wire pulling protective tube. The wire protective tube is used for the passage of the wire, and the wire pulling protective tube is used for the passage of the wire.

[0052] See also Figure 3 In some embodiments of the present application, the perfusion assembly 100 further includes an auxiliary tube 160, which is buried in the second adhesive layer 140 and coaxially arranged with the first liquid inlet tube 120. The auxiliary tube 160 can ensure the coaxiality of the first tube section 111 and the second tube section 112.

[0053] In order to prevent the cooling medium in the perfusion assembly 100 from flowing back from the inlet of the needle assembly 300 (i.e., the proximal port of the first tube segment 111), see Figure 2 and Figure 4The ablation catheter 10 further includes a seal 400 disposed between the second irrigation tube 310 and the first tube section 111, and the seal 400 is used to seal the gap between the second irrigation tube 310 and the first tube section 111. The seal 400 can effectively ensure the sealing performance of the irrigation component 100 by cooperating with the sealing layer 150, the first adhesive layer 130, and the second adhesive layer 140, so that the irrigation component 100 can withstand a higher irrigation back pressure, and the permissible irrigation back pressure can be as high as 0.5Mpa.

[0054] Regarding the structure of the sealing member 400, two forms are given as follows:

[0055] For type (1), see Figure 2 The seal 400 is a heat shrink material that is sleeved on the second perfusion tube 310. The outer diameter of the seal 400 after heating is less than or equal to the inner diameter of the first tube segment 111, and the outer diameter of the seal 400 after cooling is greater than the inner diameter of the first tube segment 111. It should be noted that the seal 400 is arranged on the proximal end of the second perfusion tube 310 of the needle assembly 300. After the seal 400 on the needle assembly 300 is heated, the needle assembly 300 is inserted into the first perfusion tube 110 of the perfusion assembly 100; after the seal 400 is cooled, the outer wall of the seal 400 is in contact with the inner wall of the first tube segment 111, thereby sealing the gap between the first tube segment 111 and the second perfusion tube 310.

[0056] The sealing member 400 may be made of PTFE (polytetrafluoroethylene) or PET (polyethylene glycol terephthalate).

[0057] For type (2), see Figure 4 The inner wall of the first pipe section 111 has a mounting groove 110c, and the sealing member 400 is accommodated in the mounting groove 110c and abuts against the outer wall of the second perfusion pipe 310. The inner wall of the first pipe section 111 may be provided with a mounting boss 114, and the circumference of the mounting boss 114 is provided with a mounting groove 110c. The sealing member 400 may be a rubber ring or a silicone valve, and may be fixed in the mounting groove 110c by bonding or other methods.

[0058] To prevent the needle assembly 300 from bending during assembly with the infusion assembly 100, see Figure 3 and Figure 4 The proximal end of the second perfusion tube 310 of the needle assembly 300 is covered with a support tube 340 made of a hard material. The support tube 340 can be made of metal, such as stainless steel. The support tube 340 can be connected to the second perfusion tube 310 by bonding or the like.

[0059] In addition, in order to facilitate the assembly of the needle assembly 300 and the irrigation assembly 100 and the release of the needle assembly 300 (i.e., the ablation needle 320 extends from the head electrode 500), a slip layer is also provided on the proximal end of the second irrigation tube 310 of the needle assembly 300. The slip layer can reduce the friction between the needle assembly 300 and the first irrigation tube 110 during the sliding process. The slip layer can be a slip coating, and its material can be PTFE, parylene, etc.

[0060] The following describes the use process of the ablation catheter 10 as described above:

[0061] The ablation catheter 10 can enter the left ventricle through the sheath tube through the ventricular septum or directly reach the left ventricle through the aortic arch in retrograde, and the head electrode 500 is attached to the myocardial surface of the ventricular septum. Afterwards, a cooling medium (such as saline) is injected into the gap between the first perfusion tube 110 and the second perfusion tube 310 through the first liquid inlet tube 120 of the perfusion assembly 100, and the medium flows to the surface tissue of the heart through the perfusion hole on the head electrode 500, thereby reducing the temperature of the surface tissue of the endocardial myocardium during ablation and preventing the formation of thrombus. The ablation needle 320 in the needle assembly 300 punctures to the target position for ablation, and at the same time, a cooling medium (such as saline) is injected into the ablation needle 320 through the second liquid inlet tube 330 of the needle assembly 300, and the medium can flow to the target point inside the myocardium, thereby achieving the cooling of the tissue near the target point inside the myocardium during the ablation process, ensuring the stability of the output power during ablation and preventing the formation of thrombus. During ablation, the first liquid inlet tube 120 may be irrigated first, and then the second liquid inlet tube 330 may be irrigated. Alternatively, the first liquid inlet tube 120 and the second liquid inlet tube 330 may be irrigated simultaneously.

[0062] It can be seen that the ablation catheter 10 provided above can be fed with two-way perfusion saline solution that cooperates with the head electrode 500 and the ablation needle 320. The two-way perfusion saline solution can not only be independently controlled, but also has good sealing performance and can withstand perfusion back pressure up to 0.5 MPa.

[0063] On the other hand, the present application further provides an ablation system, which includes the ablation catheter 10 described in any one of the above items.

[0064] In the ablation system, the ablation catheter 10 has an extra-needle perfusion channel and an intra-needle perfusion channel, and has the functions of extra-needle perfusion and intra-needle perfusion. In addition, in the perfusion component 100, the radial dimension of the second tube segment 112 of the first perfusion tube 110 is the largest, that is, the radial dimension of the second tube segment 112 is larger than the radial dimension of the first tube segment 111 and the radial dimension of the third tube segment 113. On the one hand, the proximal end surface of the second tube segment 112 can have enough space to install the first liquid inlet tube 120, so that the perfusion component 100 does not share a liquid inlet tube with the needle component 300, so that the various perfusion saline of the ablation catheter 10 can be controlled according to actual clinical needs, such as controlling the flow rate, temperature or medium type of the various perfusion saline; on the other hand, the second tube segment 112 can be used as a pressure buffer area to reduce the back pressure during perfusion in the first perfusion tube 110, so as to prevent the connection inside the first perfusion tube 110 from being damaged and leaking due to excessive pressure.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An ablation catheter, characterized in that: It includes a catheter body, an irrigation assembly and a needle assembly; The irrigation assembly is arranged in the catheter body and includes a first irrigation tube and a first liquid inlet tube. The first irrigation tube is used for the needle assembly to movably penetrate and includes a first tube segment, a second tube segment and a third tube segment that are sequentially connected from the proximal end to the distal end. The radial dimension of the second tube segment is the largest. The first liquid inlet tube and the first tube segment are arranged side by side along the radial direction of the irrigation assembly and are connected to the second tube segment. The needle assembly includes a second liquid inlet tube, a second perfusion tube and an ablation needle which are sequentially connected from the proximal end to the distal end, and the second liquid inlet tube is separated from the first liquid inlet tube.

2. The ablation catheter according to claim 1, characterized in that: The first pipe section and the third pipe section are coaxially arranged.

3. The ablation catheter according to claim 1, characterized in that: The distal end of the first pipe section is coated with a first adhesive layer, and the first adhesive layer is used to seal and connect the first pipe section, the first liquid inlet pipe and the second pipe section; And / or, the proximal end of the third pipe segment is coated with a second adhesive layer, and the second adhesive layer is used for sealingly connecting the third pipe segment and the second pipe segment.

4. The ablation catheter according to claim 3, characterized in that: The distal end of the first pipe segment, the distal end of the first liquid inlet pipe, the proximal end of the third pipe segment and the second pipe segment are coated with a sealing layer; The first adhesive layer is filled between the sealing layer, the first pipe segment, the second pipe segment and the first liquid inlet pipe, and / or the second adhesive layer is filled between the sealing layer, the third pipe segment and the second pipe segment.

5. The ablation catheter according to claim 4, characterized in that: The first adhesive layer, and / or the second adhesive layer, and / or the sealing layer are made of transparent adhesive.

6. The ablation catheter according to claim 3, characterized in that: The perfusion assembly also includes an auxiliary tube, which is buried in the second adhesive layer and coaxially arranged with the first liquid inlet tube.

7. The ablation catheter according to any one of claims 1 to 6, characterized in that: The ablation catheter further includes a sealing member disposed between the second irrigation tube and the first tube segment, and the sealing member is used for sealing a gap between the second irrigation tube and the first tube segment.

8. The ablation catheter according to claim 7, characterized in that: The seal is a heat shrink material sleeved on the second perfusion tube. The outer diameter of the seal after heating is less than or equal to the inner diameter of the first tube section, and the outer diameter of the seal after cooling is greater than the inner diameter of the first tube section.

9. The ablation catheter according to claim 7, characterized in that: The inner wall of the first pipe section has a mounting groove, and the sealing member is accommodated in the mounting groove and abuts against the outer wall of the second perfusion pipe.

10. The ablation catheter according to claim 7, characterized in that: The proximal end of the second perfusion tube is sleeved with a support tube made of a hard material.

11. The ablation catheter according to claim 7, characterized in that: A lubrication layer is arranged outside the proximal end of the second perfusion tube.

12. An ablation system, characterized in that: The ablation system comprises the ablation catheter according to any one of claims 1 to 11.

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