Ablation catheter assembly for treating anal fistula

Abstract

The invention relates to an ablation catheter assembly for treating anal fistula, the ablation catheter assembly comprises a catheter, a cable, a guide head, a PTFE part and a near-end connecting piece, a first channel and a second channel are formed in the catheter, and the first channel and the second channel extend in the axial direction; within the length range of the first channel and the second channel, the first channel and the second channel are mutually independent and are not communicated with each other, a connecting cavity is formed at the far end of the catheter, the far end of the first channel and the far end of the second channel are both communicated with the connecting cavity, and the first channel and the second channel are communicated with the connecting cavity. The far end of the first channel is communicated with the far end of the second channel; the catheter is further provided with at least three flushing openings, the flushing openings are located at the position of the connecting cavity, the flushing openings are directly communicated with the connecting cavity, and the inner diameter of each flushing opening is not larger than 0.1 mm. Tissues around the fistula are denatured through microwaves, coagulative necrosis is formed, and the purpose of safely treating anal fistula is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to an ablation catheter assembly for treating anal fistula. Background Art

[0002] Anal fistula is a common anorectal surgical condition, accounting for approximately 15%-20% of anorectal morbidity. Currently, the main clinical treatments include fistulotomy, seton therapy, bio-protein glue filling, and laser therapy. Fistulotomy creates a large incision and requires a long recovery period, which can affect the patient's anal function. Seton therapy has the disadvantage of a long treatment cycle; bio-protein glue filling has a high recurrence rate; and laser therapy has the disadvantages of expensive equipment and a high risk of carbonization of normal tissue. Summary of the Invention

[0003] In view of this, the present invention provides an ablation catheter assembly for treating anal fistula, which uses microwaves to denature tissue around the fistula to form coagulative necrosis, thereby achieving the purpose of safely treating anal fistula.

[0004] The technical solution adopted in the present invention is:

[0005] An ablation catheter assembly for treating anal fistula, comprising a catheter, a cable, a guide head, a PTFE piece and a proximal connector.

[0006] A first channel and a second channel are formed in the catheter, and both the first channel and the second channel extend in the axial direction. Within the length range of the first channel and the second channel, the first channel and the second channel are independent of each other and do not communicate with each other. A connecting cavity is formed at the distal end of the catheter, and the distal ends of the first channel and the second channel are both connected to the connecting cavity, so that the distal end of the first channel is connected to the distal end of the second channel.

[0007] The cable passes through the first channel, and the cross-sectional area of the first channel is larger than the cross-sectional area of the cable, so that a cooling cavity is formed inside the first channel and outside the cable;

[0008] The proximal end of the catheter is connected to the proximal connector, and the proximal connector is provided with a first cavity and a second cavity separated from each other, the first cavity is located at the distal end of the second cavity, the proximal end of the catheter extends into the second cavity, the proximal end of the second channel is closed, and the proximal end of the first channel passes through the proximal end of the catheter, so that the first channel is connected to the second cavity;

[0009] The conduit is provided with a liquid return port, the liquid return port is communicated with the second channel, and the liquid return port is located in the first cavity, so that the second channel is communicated with the first cavity through the liquid return port;

[0010] The PTFE piece is annular in structure and is inserted into the opening of the connecting cavity at the distal end of the catheter, forming an insertion channel in the PTFE piece; the guide head is inserted into the insertion channel from the distal end side, and the guide head and the PTFE piece jointly seal the opening of the connecting cavity, and the distal end of the cable is connected to the guide head;

[0011] The catheter is further provided with at least three flushing ports, each of which is located at the position of the connecting cavity and is directly connected to the connecting cavity. The inner diameter of the flushing port is no greater than 0.1 mm.

[0012] Preferably, the flushing ports are arranged at equal intervals in the circumferential direction of the catheter.

[0013] Preferably, a proximal space is formed in the proximal connector, a partition plate is provided in the proximal space, the partition plate divides the proximal space into the first cavity and the second cavity, a communicating hole is provided on the partition plate, and the proximal end of the catheter is inserted into the second cavity through the first cavity and the communicating hole;

[0014] The proximal connecting member is provided with a first connecting port and a second connecting port, the first connecting port being in communication with the first cavity, the second connecting port being in communication with the second cavity, the first connecting port being externally connected to a first liquid pipe, the second connecting port being externally connected to a second liquid pipe, the first liquid pipe being connected to a first control valve, the second liquid pipe being connected to a second control valve;

[0015] When the second valve is in the open state, physiological saline is injected into the second cavity and then injected into the connecting cavity through the cooling cavity.

[0016] When the first valve is in the open state, the physiological saline in the connecting cavity flows into the first cavity through the second channel and is discharged from the first liquid pipe;

[0017] When the first valve is in a closed state, the physiological saline in the connecting cavity is sprayed out from the flushing port.

[0018] Preferably, the catheter includes a first tube segment and a second tube segment connected to each other, the second tube segment is located on the distal side of the first tube segment, the first channel and the second channel are located in the first tube segment, the connecting cavity is formed in the second tube segment, and the length of the second tube segment is not more than 1 cm.

[0019] Preferably, a partition plate is provided in the first pipe segment, and the partition plate extends along the length direction of the first pipe segment. The partition plate separates the space in the first pipe segment into a first channel and a second channel.

[0020] Preferably, both sides of the partition plate in the width direction are connected to the inner wall of the conduit, and in the width direction, the middle part of the partition plate protrudes toward one side of the second channel to expand the radial dimension of the middle part of the first channel to facilitate the cable to pass through the first channel.

[0021] Preferably, it also includes a sleeve, which includes a first annular segment and a second annular segment connected to each other, the outer diameter of the first annular segment matches the inner diameter of the connecting cavity, the outer diameter of the second annular segment is consistent with the outer diameter of the conduit, the first annular segment is inserted into the connecting cavity from the opening of the connecting cavity, the PTFE part is inserted into the second annular segment and fixed to the opening of the connecting cavity through the sleeve, and the sleeve, the guide head and the PTFE part jointly close the opening of the connecting cavity.

[0022] Preferably, the first annular segment is provided with two mounting openings which are arranged opposite to each other in the radial direction, each mounting opening is embedded with an LED lamp, and the wires of the LED lamp are led out through the first channel.

[0023] Beneficial effects of the present invention:

[0024] The proximal end of the cable is connected to a microwave generator. The microwaves emitted by the microwave generator propagate through the cable to the distal end and radiate outward through the PTFE component. During the operation, the distal end of the ablation catheter assembly is inserted into the fistula tract and microwaves are emitted through the PTFE component, causing the temperature of the tissue at the PTFE component to rise, resulting in destruction of the cell structure and formation of coagulative necrosis, thereby achieving the purpose of treating anal fistula.

[0025] When treating anal fistula, physiological saline is injected into the cooling cavity through the second cavity. The physiological saline enters the connecting cavity through the first cooling cavity and flows back into the first cavity from the second channel, thereby taking away the heat from the cable and distal components, and avoiding tissue burns caused by overheating of parts other than the PTFE parts.

[0026] In addition, the normal saline in the connecting cavity can also be sprayed out through the flushing port to flush the fistula, remove secretions or necrotic tissue in the fistula, and improve the treatment effect and surgical safety.

[0027] In actual application, physiological saline is continuously injected into the connecting cavity through the cooling cavity, and the discharge of the physiological saline in the first cavity is in a controllable state, that is, the discharge of the physiological saline in the first cavity can be controlled. When the physiological saline in the first cavity can be discharged, since the inner diameter of the flushing port is not greater than 0.1 mm, it is difficult for the physiological saline to be sprayed out from the flushing port, and thus the physiological saline in the connecting cavity basically flows into the first cavity; when the physiological saline in the first cavity cannot be discharged, the physiological saline in the connecting cavity cannot flow into the first cavity, and can only be sprayed out from the flushing port, thereby achieving control of the discharge of physiological saline from the flushing port by controlling the on and off of the outflow of physiological saline from the first cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0029] Figure 1 This is an exploded view of a microwave ablation catheter assembly used to treat anal fistulas;

[0030] Figure 2 is a first cross-sectional view of an ablation catheter assembly;

[0031] Figure 3 yes Figure 2 A partial enlarged view of the

[0032] Figure 4 is a second cross-sectional view of the ablation assembly.

[0033] In the figure: 1, catheter; 2, proximal connector; 3, guide head; 4, PTFE part; 5, bushing; 6, cable;

[0034] 11. Connecting cavity; 12. Flushing port; 13. Second channel; 14. First channel; 15. Spacer;

[0035] 21. First cavity; 22. Second cavity; 23. Partition plate; 24. First connection port; 25. Second connection port;

[0036] 51. First annular segment; 52. Second annular segment. DETAILED DESCRIPTION

[0037] The present invention is described below based on the following embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid obscuring the essence of the present invention, well-known methods, processes, procedures, and components are not described in detail.

[0038] Furthermore, persons of ordinary skill in the art will appreciate that the figures provided herein are for illustration purposes only and are not necessarily drawn to scale.

[0039] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include," "comprising," and similar words should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to."

[0040] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0041] In the present invention, “distal” refers to the side closer to the patient's body during surgery; and “proximal” refers to the side closer to the operator during surgery.

[0042] See also Figures 1-4 The present invention provides an ablation catheter assembly for treating anal fistula (hereinafter referred to as "ablation catheter assembly"), comprising a catheter 1, a cable 6, a guide head 3, a PTFE member 4 and a proximal connector 2.

[0043] A first channel 14 and a second channel 13 are formed in the catheter, and both the first channel and the second channel extend in the axial direction. Within the length range of the first channel and the second channel, the first channel and the second channel are independent of each other and do not communicate with each other. A connecting cavity 11 is formed at the distal end of the catheter, and the distal ends of the first channel and the second channel are both connected to the connecting cavity, so that the distal ends of the first channel and the second channel are connected.

[0044] The cable passes through the first channel, and the cross-sectional area of the first channel is larger than the cross-sectional area of the cable, so that a cooling cavity is formed inside the first channel and outside the cable;

[0045] The proximal end of the catheter is connected to the proximal connector, which is provided with a first cavity 21 and a second cavity 22 separated from each other. The first cavity is located at the distal end of the second cavity. The proximal end of the catheter extends into the second cavity. The proximal end of the second channel is closed, and the proximal end of the first channel passes through the proximal end of the catheter, so that the first channel is connected to the second cavity.

[0046] The conduit is provided with a liquid return port, the liquid return port is communicated with the second channel, and the liquid return port is located in the first cavity, so that the second channel is communicated with the first cavity through the liquid return port;

[0047] The PTFE piece is annular in structure and is inserted into the opening of the connecting cavity at the distal end of the catheter, forming an insertion channel in the PTFE piece; the guide head is inserted into the insertion channel from the distal end side, and the guide head and the PTFE piece jointly seal the opening of the connecting cavity, and the distal end of the cable is connected to the guide head;

[0048] The catheter is further provided with at least three flushing ports 12 , which are located at the position of the connecting cavity and are directly connected to the connecting cavity. The inner diameter of the flushing ports is no greater than 0.1 mm.

[0049] When treating anal fistula, the direction, length and other information of the fistula can be determined through a probe. Since there is often a certain amount of secretions in the fistula, the fistula is first flushed through a catheter to remove the secretions; then the ablation catheter component is used for treatment.

[0050] Specifically, the distal end of the ablation catheter assembly is extended into the fistula along the opening of the fistula, so that the distal end of the ablation assembly reaches the blind end of the fistula. For fistulas with an external opening and an internal opening, it can be extended along the external opening so that the distal end of the ablation assembly reaches the internal opening; the proximal end of the cable is connected to the microwave generator, and the microwave generator emits microwaves, which are transmitted through the cable to the distal end of the cable. Since the distal end of the cable is connected to the guide head, the guide head is located at the distal end of the catheter, and the microwaves can be transmitted along the cable to the distal end of the catheter. PTFE8 is inserted into the distal end of the catheter, and the microwaves are emitted outward through the PTFE piece, thereby acting on the tissue at the fistula, causing the temperature of the tissue at the PTFE piece to rise, thereby destroying the cell structure there and forming coagulative necrosis. In this way, the entire ablation catheter assembly is pulled backward, so that the PTFE piece can be gradually pulled to the opening, and the PTFE piece will move along the entire fistula, thereby destroying the overall internal cell structure of the fistula, thereby achieving the purpose of treating anal fistula.

[0051] During treatment, the temperature of the cell structure affected by microwaves will rise, causing the cell structure with high temperature to die, and the heat conduction performance will destroy the deeper cell structure, thus causing excessive damage.

[0052] The proximal end of the first channel is connected to the second cavity, and the cable passes through the first channel. However, since the cross-sectional area of the cable is smaller than the cross-sectional area of the first channel, the cable will not occupy the entire first channel, thereby forming a cooling channel in the first channel. The cooling channel connects the second cavity and the connecting cavity, so that the saline in the second cavity can enter the connecting cavity through the cooling channel. The connecting cavity is located at the distal end of the ablation catheter assembly, so the connecting cavity can absorb the heat at the distal end of the ablation assembly. The distal end of the second channel is connected to the connecting cavity, so the saline with increased temperature in the connecting cavity can flow from far to near through the second channel and finally flow into the first cavity through the return liquid port. In this way, the second cavity continuously outputs saline, and the first cavity continuously recovers saline, which can continuously take away the heat at the distal end of the ablation assembly, avoiding the aforementioned excessive damage and improving surgical safety.

[0053] In addition, as mentioned above, there are secretions in the fistula. Although it is flushed through the catheter first, there will still be some secretions remaining. The secretions will affect the therapeutic effect of microwaves. The setting of the flushing port allows the saline in the connecting cavity to be sprayed out through the flushing port. The flushing port is located on the distal side of the catheter, that is, the flushing port as a whole is also located on the distal side of the ablation catheter assembly. After the saline is sprayed out from the flushing port, it will immediately enter the fistula, thereby cleaning the excretions in the fistula, ensuring that there is basically no secretion in the fistula, and ensuring the therapeutic effect.

[0054] During use, the discharge of the saline solution from the first cavity can be controlled to control whether the saline solution is ejected from the flushing port or flows into the first cavity. That is, the saline solution in the connecting cavity can only be discharged in one of the following ways: flowing into the first cavity or ejected from the flushing port. It basically does not flow into the first cavity and eject from the flushing port at the same time. Specifically, the second cavity continuously inputs saline solution into the connecting cavity (maintaining a certain water pressure). Since the inner diameter of the flushing port is not greater than 0.1 mm, only when the water pressure in the connecting cavity reaches 0.5 MPa will the saline solution overcome the resistance of the flushing port and eject from the flushing port. Therefore, when the first cavity is opened, the saline solution in the connecting cavity can flow freely into the first cavity, so that the water pressure in the connecting cavity is not too high, thereby preventing the saline solution from ejecting from the flushing port. When the first cavity is closed, the saline solution cannot flow into the first cavity, causing the water pressure in the connecting cavity to increase, and eventually ejected from the flushing port to achieve the purpose of flushing. Therefore, by controlling the opening and closing of the first cavity, whether the saline solution ejects from the flushing port can be controlled.

[0055] During actual use, the fistula is first cleaned through the flushing port (the PTFE part does not emit microwaves at this time), and then microwaves are emitted through the PTFE part (the flushing port no longer sprays saline at this time) for treatment, and then the ablation catheter assembly is pulled backward a predetermined distance (for example, 1 cm), and the above process is repeated. In this way, each time the predetermined distance is pulled, the fistula is flushed once, and then microwave treatment is performed once, which can ensure that there is no secretion in the fistula and ensure the treatment effect.

[0056] Moreover, the physiological saline flows into the connecting cavity through the cooling cavity. During this process, the physiological saline is always in contact with the cable, thereby being able to better remove heat from the cable.

[0057] The flushing ports are arranged equidistantly around the circumference of the catheter, thereby improving the flushing effect on the fistula.

[0058] A proximal space is formed in the proximal connector. A partition plate 23 is provided in the proximal space. The partition plate divides the proximal space into the first cavity and the second cavity. A communicating hole is provided on the partition plate. The proximal end of the catheter is inserted into the second cavity through the first cavity and the communicating hole.

[0059] The proximal connecting member is provided with a first connecting port 24 and a second connecting port 25. The first connecting port is in communication with the first cavity, and the second connecting port is in communication with the second cavity. The first connecting port is externally connected to a first liquid pipe, and the second connecting port is externally connected to a second liquid pipe. The first liquid pipe is connected to a first control valve, and the second liquid pipe is connected to a second control valve.

[0060] When the second valve is in the open state, physiological saline is injected into the second cavity and then injected into the connecting cavity through the cooling cavity.

[0061] When the first valve is in the open state, the physiological saline in the connecting cavity flows into the first cavity through the second channel and is discharged from the first liquid pipe;

[0062] When the first valve is in a closed state, the physiological saline in the connecting cavity is sprayed out from the flushing port.

[0063] The first liquid tube is connected to the first cavity, and the second liquid tube is connected to the second cavity. Physiological saline is pumped into the second cavity through the second liquid tube. The physiological saline flows into the connecting cavity through the first channel, and flows back to the first cavity through the second channel, and flows out through the first liquid tube, forming a closed-loop cooling circuit, thereby achieving continuous cooling of the front end of the ablation component.

[0064] During the operation, the second valve is always in the open state to continuously supply saline to the connecting cavity. When the first valve is opened, the saline in the first cavity can be discharged smoothly, so that the saline in the connecting cavity can flow to the first cavity, so that the water pressure in the connecting cavity will not be too high, and saline will not be sprayed out of the flushing port; when the first valve is closed, the saline in the first cavity cannot be discharged, and thus the saline in the connecting cavity cannot flow to the first cavity. As saline is continuously supplied to the connecting cavity, the water pressure in the connecting cavity will increase, thereby overcoming the resistance of the flushing port and spraying out from the flushing port. Therefore, by controlling the opening of the first valve, the flow direction of the saline in the connecting cavity can be controlled.

[0065] The catheter includes a first tube segment and a second tube segment connected to each other, the second tube segment is located at the distal end of the first tube segment, the first channel and the second channel are located in the first tube segment, the connecting cavity is formed in the second tube segment, and the length of the second tube segment is no more than 1 cm.

[0066] The length of the first pipe section is much greater than that of the second pipe section. The first channel and the second channel both extend within the first pipe section. A connecting cavity is formed within the second pipe section. The distal end of the first channel is connected, so that the cable 7 can pass through the first channel into the connecting cavity. The distal end of the second channel is connected, so that the distal ends of the first channel and the second channel are both connected to the connecting cavity, so that the two are connected.

[0067] A partition plate 15 is provided in the first pipe section. The partition plate extends along the length direction of the first pipe section and separates the space in the first pipe section into a first channel and a second channel.

[0068] The cross-section of the partition plate remains constant at any point along the axial direction of the first tube segment, thereby dividing the space within the first tube segment into two independent spaces. This simplifies the construction of the first and second channels, eliminating the need for separate catheters to form two channels. This allows the outer diameter of the ablation catheter assembly to be kept small (less than 4 mm), facilitating passage through the fistula tract and facilitating surgical procedures.

[0069] Both sides of the partition plate in the width direction are connected to the inner wall of the conduit. In the width direction, the middle part of the partition plate protrudes toward one side of the second channel to expand the radial dimension of the middle part of the first channel to facilitate the cable to pass through the first channel.

[0070] The arrangement of the partition plate makes the cross-sections of the first channel and the second channel basically semicircular, and the middle part of the partition plate bulges toward one side of the second channel, so that the radial dimension of the middle part of the first channel is larger, thereby facilitating the passage of the cable. In addition, the cross-section of the cable is circular, and after the cable passes through the first channel, the number of cooling channels is formed into two, and the cross-sections of the two cooling channels are basically triangular. Due to the crowding of the cable, the sum of the cross-sectional areas of the two cooling channels is smaller than the cross-sectional area of the second channel. Therefore, when the first valve is opened, the second channel can provide a larger flow area for the wall cooling channel, facilitate the outflow of physiological saline in the connecting cavity, avoid the increase of water pressure in the connecting cavity, and prevent physiological saline from spraying out of the flushing port at this time.

[0071] The ablation assembly also includes a sleeve 5, which includes a first annular segment 51 and a second annular segment 52 connected to each other, the outer diameter of the first annular segment matches the inner diameter of the connecting cavity, and the outer diameter of the second annular segment is consistent with the outer diameter of the catheter. The first annular segment is inserted into the connecting cavity from the opening of the connecting cavity, and the PTFE part is inserted into the second annular segment and fixed to the opening of the connecting cavity through the sleeve. The sleeve, the guide head and the PTFE part jointly close the opening of the connecting cavity.

[0072] The first annular segment is provided with two mounting openings which are arranged opposite to each other in the radial direction. An LED lamp is embedded in each mounting opening, and the wires of the LED lamp are led out through the first channel.

[0073] The setting of the sleeve facilitates the installation of the lamp. During the operation, the lamp can emit bright light to illuminate the distal end of the ablation catheter assembly and be directly seen by medical staff through the tissue, making it easier for medical staff to understand the position of the distal end of the ablation catheter assembly and facilitate the smooth progress of the operation.

[0074] In addition, one of the two LED lamps is a cold white light LED, which is used for conventional lighting, and the other LED lamp can emit light with a wavelength of 240-280nm, using the ultraviolet sterilization principle to destroy the molecular structure of DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) in bacteria and viruses, causing growth cell death and (or) regenerative cell death, thereby achieving the effect of sterilization and disinfection.

[0075] Of course, a temperature sensor may also be provided in the connecting cavity to detect the temperature at the distal end of the ablation component, so as to facilitate control of the flow of physiological saline in the first channel and ensure smooth operation.

[0076] It should be understood that the above-mentioned embodiments are merely illustrative and non-restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will be included in the scope of the claims of the present invention.

Claims

1. An ablation catheter assembly for treating anal fistula, characterized in that: Including catheter, cable, guide head, PTFE parts and proximal connector, A first channel and a second channel are formed in the catheter, and both the first channel and the second channel extend in the axial direction. Within the length range of the first channel and the second channel, the first channel and the second channel are independent of each other and do not communicate with each other. A connecting cavity is formed at the distal end of the catheter, and the distal ends of the first channel and the second channel are both connected to the connecting cavity, so that the distal end of the first channel is connected to the distal end of the second channel. The cable passes through the first channel, and the cross-sectional area of the first channel is larger than the cross-sectional area of the cable, so that a cooling cavity is formed inside the first channel and outside the cable; The proximal end of the catheter is connected to the proximal connector, and the proximal connector is provided with a first cavity and a second cavity separated from each other, the first cavity is located at the distal end of the second cavity, the proximal end of the catheter extends into the second cavity, the proximal end of the second channel is closed, and the proximal end of the first channel passes through the proximal end of the catheter, so that the first channel is connected to the second cavity; The conduit is provided with a liquid return port, the liquid return port is communicated with the second channel, and the liquid return port is located in the first cavity, so that the second channel is communicated with the first cavity through the liquid return port; The PTFE piece is annular in structure and is inserted into the opening of the connecting cavity at the distal end of the catheter, forming an insertion channel in the PTFE piece; the guide head is inserted into the insertion channel from the distal end side, and the guide head and the PTFE piece jointly seal the opening of the connecting cavity, and the distal end of the cable is connected to the guide head; The catheter is further provided with at least three flushing ports, each of which is located at the position of the connecting cavity and is directly connected to the connecting cavity. The inner diameter of the flushing port is no greater than 0.1 mm.

2. The ablation catheter assembly for treating anal fistula according to claim 1, characterized in that: The flushing ports are arranged at equal intervals in the circumferential direction of the catheter.

3. The ablation catheter assembly for treating anal fistula according to claim 2, characterized in that: A proximal space is formed in the proximal connector, a partition plate is provided in the proximal space, the partition plate divides the proximal space into the first cavity and the second cavity, a communication hole is provided on the partition plate, and the proximal end of the catheter is inserted into the second cavity through the first cavity and the communication hole; The proximal connecting member is provided with a first connecting port and a second connecting port, the first connecting port being in communication with the first cavity, the second connecting port being in communication with the second cavity, the first connecting port being externally connected to a first liquid pipe, the second connecting port being externally connected to a second liquid pipe, the first liquid pipe being connected to a first control valve, the second liquid pipe being connected to a second control valve; When the second valve is in the open state, physiological saline is injected into the second cavity and then injected into the connecting cavity through the cooling cavity. When the first valve is in the open state, the physiological saline in the connecting cavity flows into the first cavity through the second channel and is discharged from the first liquid pipe; When the first valve is in a closed state, the physiological saline in the connecting cavity is sprayed out from the flushing port.

4. The ablation catheter assembly for treating anal fistula according to any one of claims 1 to 3, characterized in that: The catheter includes a first tube segment and a second tube segment connected to each other, the second tube segment is located at the distal end of the first tube segment, the first channel and the second channel are located in the first tube segment, the connecting cavity is formed in the second tube segment, and the length of the second tube segment is no more than 1 cm.

5. The ablation catheter assembly for treating anal fistula according to claim 4, characterized in that: A partition plate is provided in the first pipe section. The partition plate extends along the length direction of the first pipe section. The partition plate divides the space in the first pipe section into a first channel and a second channel.

6. The ablation catheter assembly for treating anal fistula according to claim 5, characterized in that: Both sides of the partition plate in the width direction are connected to the inner wall of the conduit. In the width direction, the middle part of the partition plate protrudes toward one side of the second channel to expand the radial dimension of the middle part of the first channel to facilitate the cable to pass through the first channel.

7. The ablation catheter assembly for treating anal fistula according to any one of claims 1 to 3, characterized in that: It also includes a sleeve, which includes a first annular segment and a second annular segment connected to each other, the outer diameter of the first annular segment matches the inner diameter of the connecting cavity, the outer diameter of the second annular segment is consistent with the outer diameter of the catheter, the first annular segment is inserted into the connecting cavity from the opening of the connecting cavity, the PTFE part is inserted into the second annular segment and fixed to the opening of the connecting cavity through the sleeve, and the sleeve, the guide head and the PTFE part jointly close the opening of the connecting cavity.

8. The ablation catheter assembly for treating anal fistula according to claim 7, characterized in that: The first annular segment is provided with two mounting openings which are arranged opposite to each other in the radial direction. An LED lamp is embedded in each mounting opening, and the wires of the LED lamp are led out through the first channel.

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