Radio frequency ablation catheter

Abstract

The utility model relates to a radiofrequency ablation catheter, and belongs to the technical field of ablation. The radiofrequency ablation catheter comprises a handle and an antenna unit connected with the far end of the handle, the antenna unit comprises a main body tube and an ablation electrode arranged on the outer side of the far end of the main body tube, and a water inlet cavity, a water return cavity and a guide wire guiding cavity which extend in the axial direction of the main body tube are formed in the main body tube. The water inlet cavity and the water return cavity are communicated with each other at the far end of the main body pipe, and the guide wire guiding cavity penetrates through the main body pipe and is separated from the water inlet cavity and the water return cavity. A guide wire can penetrate through the guide wire guide cavity, so that the radiofrequency ablation catheter is promoted to complete in-vivo puncture; the water inlet cavity and the water return cavity on the two sides of the guide wire guiding cavity can achieve circulation of cooling water in the radiofrequency ablation catheter, so that the radiofrequency ablation catheter is cooled during radiofrequency ablation operation, and the radiofrequency ablation catheter can integrate the multiple functions of leading-in, guide wire passing, water cooling and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ablation technology, in particular to a radiofrequency ablation catheter. BACKGROUND

[0002] In the treatment of biliary tract malignant obstruction, the conventional radiofrequency thermal ablation needs to first pass into a guide wire, then makes the guide wire radiography through CT, makes the guide wire accurately position the cavity lesion site, and positions the guide wire in the lesion site. Because radiofrequency thermal ablation needs to utilize high-frequency current to promote cell death, so as to achieve the purpose of inactivating tumor tissue. Therefore, in the radiofrequency ablation process, the temperature of the radiofrequency ablation device may be elevated, which is not conducive to treatment on the one hand, and heat may be transmitted to the operating end along the radiofrequency ablation device, which is not conducive to operation. Therefore, a radiofrequency ablation device capable of passing into a guide wire and cooling during treatment is needed. SUMMARY

[0003] The utility model provides a radiofrequency ablation catheter for solving at least one technical problem above.

[0004] The utility model provides a radiofrequency ablation catheter, including handle and with the antenna unit of the distal end of handle is connected, the antenna unit includes main part pipe and is set up in the ablation electrode of main part pipe distal end outside, be provided with the water cavity, water return cavity and guide wire guide cavity along its axial extension in main part pipe, the water cavity and water return cavity in the distal end of main part pipe intercommunication, the guide wire guide cavity penetrates main part pipe and is separated with water cavity and water return cavity respectively.

[0005] In one embodiment, the guide wire guide cavity is parallel or coincides with the axis of the main body tube, and the water inlet cavity and the water return cavity are respectively located on the two radial sides of the guide wire guide cavity.

[0006] In one embodiment, the antenna unit further comprises:

[0007] An electrode connecting tube connected to the distal end of the main body tube, the electrode connecting tube being located inside the ablation electrode and electrically connected to the ablation electrode; and

[0008] A signal transmission line electrically connected to the electrode connecting tube, the signal transmission line extending in the water inlet cavity or the water return cavity.

[0009] In one embodiment, the electrode connecting tube is provided with a micropore, the micropore being in fluid communication with the water inlet cavity and / or the water return cavity;

[0010] The ablation electrode covers the micropore along the axial direction of the electrode connecting tube. The ablation electrode is provided with a drip hole, and the drip hole and the micropore are in fluid communication through the radial gap between the ablation electrode and the electrode connecting tube.

[0011] In one embodiment, the ablation electrode includes a single electrode or a dual electrode that is electrically connected to and in fluid communication with the electrode connection tube.

[0012] In one embodiment, the antenna unit further includes at least one sub-needle disposed in the guide wire guide cavity, at least one of the sub-needles being conductive and / or at least one of the sub-needles having a liquid injection hole at its tip.

[0013] In one embodiment, the system further includes a guidewire cannula with a Luer connector, the guidewire cannula being connected to the proximal end of the handle and communicating with the guidewire guide cavity, allowing the guidewire to enter the guidewire guide cavity from the guidewire cannula.

[0014] In one embodiment, the guide wire tube is further provided with a guide wire fixing device, which can fix the guide wire in the guide wire tube after the guide wire enters the guide wire guide cavity from the guide wire tube.

[0015] In one embodiment, the antenna unit further includes a puncture guidewire or a hollow guidewire with a needle tip extending in the guidewire guide cavity.

[0016] In one embodiment, the antenna unit further includes a tip disposed at the distal end of the ablation electrode, the guide wire guiding cavity extending through the tip.

[0017] In one embodiment, the antenna unit further includes a temperature detection device disposed in the water inlet chamber and / or the water return chamber.

[0018] In one embodiment, a push reinforcing rod is provided at the distal end of the handle, one end of which is connected to the distal end of the handle via a positioning sleeve, and the other end of which is connected to the main body tube.

[0019] In one embodiment, a light source is also provided on the outer side of the handle, and the light source is arranged along the circumference of the handle.

[0020] In one embodiment, the proximal end of the handle is further connected to an inlet pipe and a return pipe. The handle is provided with an inlet chamber and a return chamber that are separated from each other. The inlet chamber is in fluid communication with the inlet pipe and the inlet chamber, respectively, and the return chamber is in fluid communication with the return pipe and the return chamber, respectively.

[0021] Compared with the prior art, the advantages of this utility model are that the guide wire guiding cavity allows the guide wire to pass through, thereby facilitating the completion of the radiofrequency ablation catheter puncture in the body; the water inlet and water return chambers on both sides of the guide wire guiding cavity can realize the circulation of cooling water in the radiofrequency ablation catheter, thereby cooling the radiofrequency ablation catheter during the radiofrequency ablation operation, so that the radiofrequency ablation catheter can integrate multiple functions such as insertion, guide wire passage and water cooling. Attached Figure Description

[0022] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0023] Figure 1 This is a front view of the radiofrequency ablation catheter in one embodiment of this utility model;

[0024] Figure 2 This is an axial sectional view of the radiofrequency ablation catheter in one embodiment of this utility model;

[0025] Figure 3a yes Figure 1 Enlarged view at point A;

[0026] Figure 3b yes Figure 2 Enlarged view at point B;

[0027] Figure 3c This is a radial sectional view of the main tube in an embodiment of this utility model;

[0028] Figure 3d This is a three-dimensional structural diagram of the main tube in an embodiment of this utility model;

[0029] Figure 4a This is a front view of the main tube in another embodiment of this utility model;

[0030] Figure 4b and Figure 4c They are Figure 4a The axial sectional view of the main tube shown;

[0031] Figure 4d yes Figure 4a A radial sectional view of the main tube shown;

[0032] Figure 5a This is a front view of the electrode connecting tube in an embodiment of this utility model;

[0033] Figure 5b This is a front view of the ablation electrode covering the electrode connecting tube in an embodiment of this utility model;

[0034] Figure 5c This is a three-dimensional structural diagram of the ablation electrode covering the electrode connecting tube in an embodiment of this utility model;

[0035] Figure 6a This is a front view of the puncture guidewire being inserted into the guidewire guide cavity in an embodiment of this utility model;

[0036] Figure 6b This is a front view of a hollow guidewire with a needle tip inserted into the guidewire guide cavity in an embodiment of this utility model;

[0037] Figure 7a This is a front view of a main tube with dual electrodes in one embodiment of the present invention;

[0038] Figure 7b It is the insertion of a puncture guide wire. Figure 7a Front view of the guide wire guide cavity in the main tube shown;

[0039] Figure 7c A hollow guide wire with a needle tip is inserted. Figure 7a Front view of the guide wire guide cavity in the main tube shown;

[0040] Figure 8 This is a front view of the main body tube with a sub-needle in one embodiment of the present invention;

[0041] Figure 9 This is a cross-sectional view of the guide wire fixing device in an embodiment of this utility model.

[0042] Figure label:

[0043] 1. Cables; 2. Water inlet pipe;

[0044] 3. Guide wire tube; 31. Guide wire fixing device;

[0045] 4. Return water pipe; 5. Cable bundle sleeve;

[0046] 60. Handle; 6. Upper shell; 7. Lower shell;

[0047] 8. Light source; 9. Head end; 10. Positioning sleeve; 11. Push reinforcing rod;

[0048] 12. Antenna unit;

[0049] 61. Inlet chamber; 62. Return chamber;

[0050] 63. First sealing section; 64. Second sealing section; 65. Partition plate;

[0051] 15. Main tube; 16. Ablation electrode; 17. Dropper hole; 18. Tip;

[0052] 19. Electrode connecting tube; 20. Micropore;

[0053] 21. Guidewire guiding cavity; 211. Connecting part;

[0054] 22. Inlet chamber; 23. Outlet chamber;

[0055] 24. Signal transmission line; 25. Temperature detection device;

[0056] 26. Puncture guidewire; 27. Hollow guidewire with needle tip; 28. Sub-needle. Detailed Implementation

[0057] The present invention will be further described below with reference to the accompanying drawings.

[0058] This invention provides a radiofrequency ablation catheter with multiple functions such as puncture, insertion, temperature measurement, water cooling, and fluid injection. In particular, it can facilitate the puncture of radiofrequency ablation catheters in lesions with tortuous and complex pathways, such as the biliary tract, and improve the ease of insertion of radiofrequency ablation catheters.

[0059] like Figure 1 and Figure 2 As shown, the radiofrequency ablation catheter includes a handle 60 and an antenna unit 12 connected to the distal end of the handle 60. The handle 60 is used by the operator to grip for puncture. The handle 60 can be a one-piece structure or a split structure, such as... Figure 1 As shown, the handle 60 is a split structure consisting of an upper shell 6 and a lower shell 7. When the upper shell 6 and the lower shell 7 are fastened together, they form a handle 60 that is cylindrical or elliptical in shape.

[0060] like Figure 1 As shown in Figure 3, the antenna unit 12 includes a main tube 15 and an ablation electrode 16 disposed on the outer side of the distal end of the main tube 15. The main tube 15 has an inlet chamber 22, a return chamber 23, and a guide wire guiding chamber 21 extending along its axial direction. The inlet chamber 22 and the return chamber 23 are interconnected at the distal end of the main tube 15. The guide wire guiding chamber 21 passes through the main tube 15 and is separated from the inlet chamber 22 and the return chamber 23, respectively. Cooling water can be delivered to the inlet chamber 22 to cool the radiofrequency ablation catheter. During radiofrequency ablation, the catheter typically uses a high-frequency current greater than 10 kHz to cause ions in the living tissue to vibrate and rub against each other, generating heat. This causes the tissue temperature to exceed 60°C, leading to cell death and eventual coagulation, thereby achieving the purpose of inactivating tumor tissue. Therefore, the temperature of the radiofrequency ablation catheter will rise. The cooling water in the inlet chamber 22 can cool the radiofrequency ablation catheter during treatment. Furthermore, the inlet chamber 22 and the return chamber 23 are fluidly connected, so the cooling water can return from the return chamber 23, thereby circulating the cooling water in the radiofrequency ablation catheter.

[0061] like Figure 3a , Figure 3b , Figure 3c and Figure 3dAs shown, in an optional embodiment, the guidewire guiding cavity 21 coincides with the axis of the main tube 15 (e.g., Figure 3c As shown), the inlet chamber 22 and the return chamber 23 are located on the radial sides of the guide wire guiding chamber 21, respectively. Figure 3c As shown, the guide wire guiding cavity 21 is located at the center of the main tube 15. The outer wall of the guide wire guiding cavity 21 is connected to the inner wall of the main tube 15 through two connecting parts 211 extending radially therefrom. Therefore, the guide wire guiding cavity 21 and the connecting parts 211 together divide the internal space of the main tube 15, forming the inlet cavity 22 and the return cavity 23. The inlet cavity 22 and the return cavity 23 are symmetrically arranged about the guide wire guiding cavity 21, and the main tube 15 as a whole has a symmetrical structure, as shown. Figure 3c As shown, it has two axes of symmetry.

[0062] like Figure 4a , Figure 4b , Figure 4c and Figure 4d As shown, in another alternative embodiment, the guidewire guiding cavity 21 is parallel to the axis of the main tube 15 (e.g., Figure 4d As shown), the inlet chamber 22 and the return chamber 23 are located on the radial sides of the guide wire guiding chamber 21, respectively. Figure 4d As shown, the guide wire guiding cavity 21 is eccentrically positioned relative to the main body tube 15, with a certain distance between their axes. The outer wall of the guide wire guiding cavity 21 is connected to the inner wall of the main body tube 15 via a connecting portion 211 extending radially therefrom, and a portion of the outer wall of the guide wire guiding cavity 21 is directly connected to the inner wall of the main body tube 15. Therefore, the guide wire guiding cavity 21 and the connecting portion 211 together divide the internal space of the main body tube 15, forming the inlet cavity 22 and the return cavity 23. The inlet cavity 22 and the return cavity 23 can also be symmetrically arranged about the guide wire guiding cavity 21, and the main body tube 15 as a whole has a symmetrical structure, such as... Figure 4d As shown, it has one axis of symmetry. Furthermore, due to... Figure 4d The eccentric guide wire guiding cavity 21 shown can be connected to the main tube 15 through only one connecting part 211, thus reducing its molding difficulty and making it easier to manufacture and produce.

[0063] The main tube 15 has a symmetrical structure, which can make the volume of the inlet chamber 22 and the return chamber 23 roughly the same, that is, the inflow and return flow rates of cooling water are basically the same, so that the flow rate of cooling water is kept uniform, and the radiofrequency ablation conduit can be cooled evenly.

[0064] It is conceivable that the main tube 15 may also have other structural forms, such as the cross-section of the guide wire guiding cavity 21 being elliptical or other shapes, and the structural forms of the water inlet cavity 22 and the water return cavity 23 may be defined by the outer wall of the guide wire guiding cavity 21 and the connecting part 211.

[0065] The function of the guidewire guiding cavity 21 is, on the one hand, to allow the guidewire to pass through, and the guidewire may be, for example, Figure 6a The puncture guidewire 26 shown can pass through the guidewire guide lumen 21, thereby facilitating the completion of intra-body puncture of the radiofrequency ablation catheter; or the guidewire can also be... Figure 6b The hollow guidewire 27 with a needle tip shown can pass through the guidewire guidance lumen 21, thereby facilitating the intracorporeal puncture of the radiofrequency ablation catheter. This solves the problem that the radiofrequency ablation catheter is difficult to puncture into lesions in cavities such as the bile duct due to its tortuous and complex path. Furthermore, biopsies can also be taken through the hollow guidewire 27 with a needle tip, for example, by taking a biopsy under negative pressure using the hollow guidewire 27 with a needle tip.

[0066] On the other hand, during cholecystectomy, the guidewire guiding lumen 21 allows the endoscope to pass through; in cholecystectomy for bile drainage or other surgeries requiring drainage, the guidewire guiding lumen 21 can serve a drainage function. Understandably, when a hollow guidewire 27 with a needle tip is inserted into the guidewire guiding lumen 21, the hollow guidewire 27 with the needle tip can also serve a drainage function.

[0067] Thirdly, the guidewire guiding cavity 21 can serve as a contrast agent injection channel or a drug delivery channel. After the guidewire is withdrawn from the guidewire guiding cavity 21, a contrast agent can be injected through the guidewire guiding cavity 21 to enhance contrast, or a chemical drug can be delivered into the guidewire guiding cavity 21 for drug delivery.

[0068] The main tube 15 can be a one-piece molded multi-cavity tubular structure. For example, it can be an extruded multi-cavity polymer tubing, wherein the guide wire guiding cavity 21, the water inlet cavity 22, and the water return cavity 23 are integrally formed.

[0069] Preferably, the main tube 15 can be made of multi-cavity polymer tubing such as nylon, polyester, or PEEK.

[0070] Optionally, the main tube 15 is made of a composite tube with an inner, middle, and outer three-layer structure. The inner layer is made of a flexible material such as Pebax or TPU; the middle layer is made of braided wire or spring-wound wire of stainless steel such as 304 or 316, or nickel-titanium braided wire or spring-wound wire; and the outer layer is made of a high-temperature resistant material such as PTFE or FEP. The three layers can be connected by welding or bonding.

[0071] like Figure 3b , Figure 4b , Figure 5a and Figure 5b As shown, antenna element 12 also includes an electrode connection tube 19 and a signal transmission line 24. The electrode connection tube 19 is connected to the distal end of the main body tube 15. Please refer to... Figure 3c and Figure 4dThe electrode connecting pipe 19 can connect the water inlet chamber 22 and the water return chamber 23 in fluid. The cooling water in the water inlet chamber 22 can flow out to the electrode connecting pipe 19 and enter the water return chamber 23.

[0072] like Figure 5c As shown, the electrode connecting tube 19 is located inside the ablation electrode 16 and is electrically connected to the ablation electrode 16. The electrode connecting tube 19 can be electrically connected to the ablation electrode 16 by fusion welding, pressure welding, brazing, or laser welding on its outer wall or inner surface.

[0073] The signal transmission line 24 can be a high-frequency signal transmission line, which is electrically connected to the electrode connecting tube 19 and extends in the water inlet chamber 22 or the water return chamber 23. The signal transmission line 24 can be connected to the outer or inner wall of the electrode connecting tube 19. For example, it can be electrically connected to the signal transmission line 24 by fusion welding, pressure welding, brazing, or laser welding on the outer wall or inner surface of the electrode connecting tube 19.

[0074] like Figure 5a As shown, the electrode connecting pipe 19 is provided with micropores 20, which are in fluid communication with the water inlet chamber 22 and / or the water return chamber 23. Therefore, cooling water can enter the micropores 20 through the water inlet chamber 22 and / or the water return chamber 23. The number of micropores 20 can be one or more, and multiple micropores 20 can be spaced apart along the axial direction of the electrode connecting pipe 19.

[0075] Furthermore, such as Figure 5b As shown, the ablation electrode 16 covers micropores 20 along the axial direction of the electrode connecting tube 19. A drip hole 17 is provided on the ablation electrode 16, and the drip hole 17 and the micropores 20 are in fluid communication through a radial gap between the ablation electrode 16 and the electrode connecting tube 19. Therefore, cooling water can enter the micropores 20 through the inlet chamber 22 and / or the return chamber 23, then enter the radial gap between the ablation electrode 16 and the electrode connecting tube 19, and flow through the drip hole 17 to the outside of the ablation electrode 16, and then flow into the treatment area.

[0076] The diameter of the micropore 20 is 0.01mm-0.5mm. The radial gap between the ablation electrode 16 and the electrode connecting tube 19 is selected to be 0.01mm-0.1mm. Under a given pressure, cooling water passes sequentially through the micropore 20, the radial gap, and the drip hole 17, thereby forming a micro-volume injection, which helps to reduce impedance during radiofrequency ablation. In addition, different injection volumes can be achieved by controlling different cooling water pressures.

[0077] like Figure 6a and Figure 6bAs shown, the ablation electrode 16 includes a single electrode that is electrically connected to and fluidly communicates with the electrode connecting tube 19. In this embodiment, the ablation electrode 16 is used as a positive electrode, and a negative electrode can be attached to the patient's body to form an electrode pair.

[0078] like Figure 7a , Figure 7b and Figure 7c As shown, the ablation electrode 16 includes a dual electrode electrically connected to and fluidly communicating with the electrode connecting tube 19. That is, the ablation electrode 16 includes two electrodes connected to the distal end of the main tube 15, one of which can be used as a positive electrode and the other as a negative electrode, thus eliminating the need to attach a negative electrode to the patient and further preventing burns from the negative electrode. In this embodiment, both ablation electrodes 16 can be provided with a drip hole 17, so that both ablation electrodes 16 can be fluidly communicating with the micropores 20 on the electrode connecting tube 19 to form a micro-injection; or one of the two ablation electrodes 16 can be provided with a drip hole 17, so that only one ablation electrode 16 is fluidly communicating with the micropores 20 on the electrode connecting tube 19 to form a micro-injection.

[0079] like Figure 8 As shown, the antenna unit 12 also includes at least one sub-needle 28 disposed in the guide wire guiding cavity 21. The at least one sub-needle 28 is conductive. The sub-needle 28 can be used for tissue puncture, and since it is conductive, it can also be used as a negative electrode. It can form an electrode pair with the ablation electrode 16, thus eliminating the need to attach a negative electrode to the patient and further preventing the negative electrode from burning the patient.

[0080] In addition, at least one sub-needle 28 has an injection hole at its tip, through which chemical drugs can be injected into the tissue, and the conductivity of the sub-needle 28 can also be increased.

[0081] like Figure 8 As shown, the sub-needle 28 is movably connected to the main tube 15. The sub-needle 28 can extend out of the main tube 15 and spread outward from the main tube 15 to form an umbrella-shaped structure.

[0082] The number of sub-needles 28 can be set as needed, for example, 6 or more. Nickel-titanium sub-needles 28 can be used to facilitate tissue puncture.

[0083] Please continue to body 1. The radiofrequency ablation catheter also includes a guidewire tube 3 with a Luer connector. The guidewire tube 3 is connected to the proximal end of the handle 60 and communicates with the guidewire guiding cavity 21, so that the guidewire can enter the guidewire guiding cavity 21 from the guidewire tube 3.

[0084] like Figure 9As shown, the guidewire tube 3 is also equipped with a guidewire fixing device 31. After the guidewire enters the guidewire guiding cavity 21 from the guidewire tube 3, the guidewire fixing device 31 can fix the guidewire in the guidewire tube 3. The guidewire fixing device 31 can be a slider structure, which is filled with a deformable soft material. When the guidewire enters the guidewire guiding cavity 21, the soft material can be squeezed onto the guidewire by sliding the slider structure, thereby pressing and fixing the guidewire to the guidewire tube 3 to assist in the in vivo puncture and / or biopsy operation of the radiofrequency ablation catheter.

[0085] A Luer connector can be connected to the guidewire tube 3. After the guidewire is withdrawn from the guidewire guide cavity 21, contrast agent can be injected into the guidewire guide cavity 21 through the Luer connector to enhance the contrast, or chemical drugs can be introduced into the guidewire guide cavity 21. That is, the guidewire guide cavity 21 can be used as a drug delivery channel for drug administration.

[0086] like Figure 2 As shown, the antenna unit 12 also includes a tip 18 disposed at the distal end of the ablation electrode 16, and the guide wire guiding cavity 21 extends through the tip 18. The tip 18 facilitates puncture entry during guide wire guidance. A conductive anti-adhesion coating is provided on the outer surfaces of the tip 18, the ablation electrode 16, and the main tube 15. This coating is preferably formed by mixing conductive spraying material and anti-adhesion spraying material at a certain temperature and under vacuum to solve the problem of tissue adhesion after ablation, thereby reducing complications.

[0087] The antenna unit 12 also includes a temperature detection device 25, which is disposed in the water inlet chamber 22 and / or the water return chamber 23. The temperature detection device 25 may be, for example, a thermocouple or a temperature sensor, to which a temperature measuring wire is connected. The temperature measuring wire can extend from the water inlet chamber 22 and / or the water return chamber 23 to the outside of the handle 60. The temperature detection device 25 can detect the ablation temperature, thereby adjusting the set power of the radiofrequency ablation catheter in a timely manner to prevent problems such as tissue charring, increased impedance, small ablation area, and tissue adhesion to electrodes caused by ablation at high power.

[0088] Please continue to refer to this. Figure 1 The distal end of the handle 60 is provided with a push reinforcing rod 11. One end of the push reinforcing rod 11 is connected to the distal end of the handle 60 through the positioning sleeve 10, and the other end of the push reinforcing rod 11 is connected to the main tube 15. The push reinforcing rod 11 can promote the push of the radiofrequency ablation catheter.

[0089] like Figure 2 As shown, the distal end of the handle 60 is provided with a tapered head end 9. The larger diameter end of the positioning sleeve 10 abuts against the end of the head end 9. The push reinforcing rod 11 passes through the positioning sleeve 10 from the head end 9 and exits from the smaller diameter end of the positioning sleeve 10. The main body tube 15 is connected to the push reinforcing rod 11 at its proximal end.

[0090] likeFigure 1 As shown, a light source 8 is also provided on the outer side of the handle 60, and the light source 8 is arranged circumferentially along the handle 60. The light source 8 can be one or more apertures, and multiple light sources 8 can be spaced apart along the axial direction of the handle 60. The light source 8 can provide illumination during the puncture of the radiofrequency ablation catheter.

[0091] Please continue reading Figure 1 and Figure 2 The handle 60 is also connected to an inlet pipe 2 and a return pipe 4 at its proximal end. The handle 60 contains a separate inlet chamber 61 and a return chamber 62. The inlet chamber 61 is in fluid communication with both the inlet pipe 2 and the inlet cavity 22, while the return chamber 62 is in fluid communication with both the return pipe 4 and the return cavity 23. Cooling water can flow through the inlet pipe 2 and the inlet chamber 61 into the inlet cavity 22, and then return to the return cavity 23 at the electrode connection pipe 19. Finally, it returns to the return pipe 4 through the return chamber 62, thus achieving cooling water circulation.

[0092] like Figure 2 As shown, the proximal end of the handle 60 is also provided with a first sealing part 63, which can seal the reflux chamber 62. Understandably, the distal end of the handle 60 is also provided with a second sealing part 64, which can seal the inlet chamber 61. The second sealing part 64 can be connected to the tip 9 at the distal end of the handle 60. The first sealing part 63 and the second sealing part 64 can be connected by a connecting plate 66. Figure 2 As shown, the inlet chamber 61 and the return chamber 62 are separated from each other by a partition 65. The partition 65 can form an integral structure with the connecting plate 66 that connects the first sealing part 63 and the second sealing part 64.

[0093] like Figure 1 As shown, the aforementioned signal transmission line 24 and temperature measuring line both extend to the proximal end of the handle 60. In addition, the impedance measuring line in the main tube 15 forms cable 1 with the aforementioned signal transmission line 24 and temperature measuring line at the proximal end of the handle 60. Cable 1 can be connected to an radio frequency device.

[0094] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A radiofrequency ablation catheter, characterized in that, The device includes a handle (60) and an antenna unit (12) connected to the distal end of the handle (60). The antenna unit (12) includes a main tube (15) and an ablation electrode (16) disposed on the outer side of the distal end of the main tube (15). The main tube (15) is provided with an inlet chamber (22), a return chamber (23) and a guide wire guide chamber (21) extending along its axial direction. The inlet chamber (22) and the return chamber (23) are interconnected at the distal end of the main tube (15). The guide wire guide chamber (21) penetrates the main tube (15) and is separated from the inlet chamber (22) and the return chamber (23) respectively.

2. The radiofrequency ablation catheter according to claim 1, characterized in that, The guide wire guiding cavity (21) is parallel to or coincides with the axis of the main tube (15), and the water inlet cavity (22) and the water return cavity (23) are located on the radial sides of the guide wire guiding cavity (21), respectively.

3. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, The antenna unit (12) further includes: An electrode connecting tube (19) is connected to the distal end of the main tube (15), the electrode connecting tube (19) being located inside the ablation electrode (16) and electrically connected to the ablation electrode (16); and A signal transmission line (24) is electrically connected to the electrode connecting tube (19), and the signal transmission line (24) extends in the water inlet chamber (22) or the water return chamber (23).

4. The radiofrequency ablation catheter according to claim 3, characterized in that, The electrode connecting tube (19) is provided with micropores (20), and the micropores (20) are in fluid communication with the water inlet chamber (22) and / or the water return chamber (23); The ablation electrode (16) covers the micropore (20) along the axial direction of the electrode connecting tube (19). The ablation electrode (16) is provided with a drip hole (17). The drip hole (17) and the micropore (20) are in fluid communication through the radial gap between the ablation electrode (16) and the electrode connecting tube (19).

5. The radiofrequency ablation catheter according to claim 3, characterized in that, The ablation electrode (16) includes a single electrode or a dual electrode that is electrically connected to and in fluid communication with the electrode connecting tube (19).

6. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, The antenna unit (12) further includes at least one sub-needle (28) disposed in the guide wire guide cavity (21), at least one sub-needle (28) being conductive and / or the tip of at least one sub-needle (28) being provided with an injection hole.

7. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, It also includes a guidewire tube (3) with a Luer connector, the guidewire tube (3) being connected to the proximal end of the handle (60), the guidewire tube (3) communicating with the guidewire guide cavity (21) so that the guidewire can enter the guidewire guide cavity (21) from the guidewire tube (3). The guide wire tube (3) is also provided with a guide wire fixing device (31). After the guide wire enters the guide wire guide cavity (21) from the guide wire tube (3), the guide wire fixing device (31) can fix the guide wire in the guide wire tube (3).

8. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, The antenna unit (12) also includes a puncture guide wire (26) or a hollow guide wire (27) with a needle tip extending in the guide wire guide cavity (21).

9. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, The antenna unit (12) also includes a tip (18) disposed at the distal end of the ablation electrode (16), and the guide wire guide cavity (21) extends through the tip (18).

10. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, The antenna unit (12) further includes a temperature detection device (25), which is disposed in the water inlet chamber (22) and / or the water return chamber (23).

11. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, The handle (60) is provided with a push reinforcing rod (11) at its distal end. One end of the push reinforcing rod (11) is connected to the distal end of the handle (60) through a positioning sleeve (10), and the other end of the push reinforcing rod (11) is connected to the main body tube (15).

12. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, A light source (8) is also provided on the outside of the handle (60), and the light source (8) is arranged along the circumference of the handle (60).

13. The radiofrequency ablation catheter according to claim 1 or 2, characterized in that, The handle (60) is also connected to an inlet pipe (2) and a return pipe (4) at its proximal end. The handle (60) is provided with an inlet chamber (61) and a return chamber (62) that are separated from each other. The inlet chamber (61) is in fluid communication with the inlet pipe (2) and the inlet chamber (22) respectively. The return chamber (62) is in fluid communication with the return pipe (4) and the return chamber (23) respectively.

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