A microwave ablation assembly for treating anal fistulas

Abstract

The present application relates to a kind of microwave ablation assembly for treating anal fistula, including outer tube, cable, guide head, PTFE piece and proximal connector, first passage, second passage, third passage and fourth passage are formed in outer tube, cable passes through first passage;Liquid inlet and liquid outlet are provided on the side wall of outer tube, and liquid inlet and liquid outlet are communicated with second passage;The proximal end of outer tube is connected to proximal connector, and first cavity and second cavity are provided on the proximal connector, and the proximal end of fourth passage is through the proximal end of outer tube, so that fourth passage is communicated with second cavity, and the distal end of third passage and the distal end of fourth passage are all communicated with the connecting cavity of outer tube;Liquid return port is provided on outer tube, and liquid return port is located in first cavity;PTFE piece is inserted into the distal end of outer tube, and insertion channel is formed in PTFE piece;Guide head is inserted into insertion channel from distal end side, and the distal end of cable is connected with guide head.By microwave, the tissue around fistula is denatured, and forms coagulation necrosis, to realize the purpose of safe treatment of anal fistula.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a microwave ablation component for treating anal fistula. Background Technology

[0002] Anal fistula is a common disease in anorectal surgery, accounting for approximately 15%-20% of anorectal diseases. Current clinical treatment methods mainly include: fistula incision, seton placement, biological protein glue filling, and laser therapy. Fistula incision creates a large wound and requires a long recovery time, during which time it can affect the patient's anal function; seton placement has the disadvantage of a long treatment cycle; biological protein glue filling has the disadvantage of a high recurrence rate; and laser therapy has the disadvantages of expensive equipment and a high probability of carbonization of normal tissue. Summary of the Invention

[0003] In view of this, the present invention provides a microwave ablation component for treating anal fistula, which uses microwaves to denature the tissue around the fistula, forming coagulative necrosis, thereby achieving the purpose of safely treating anal fistula.

[0004] The technical solution adopted in this invention is as follows:

[0005] A microwave ablation assembly for treating anal fistulas includes an outer tube, a cable, a guide head, a PTFE component, and a proximal connector.

[0006] The outer tube forms a first channel, a second channel, a third channel, and a fourth channel, all of which extend along the axial direction of the outer tube, and the cable passes through the first channel;

[0007] The proximal and distal ends of the second channel are both closed. The side wall of the outer tube is provided with an inlet and an outlet. The inlet and the outlet are both connected to the second channel. The inlet is located on the proximal side of the outer tube, and the outlet is located on the distal side of the outer tube. An inlet pipe is connected to the inlet.

[0008] The proximal end of the outer tube is connected to the proximal end connector. The proximal end connector is provided with a first cavity and a second cavity that are separated from each other. The first cavity is located on the distal side of the second cavity. The proximal end of the outer tube extends into the second cavity. The proximal end of the third channel is closed. The proximal end of the fourth channel passes through the proximal end of the outer tube, so that the fourth channel communicates with the second cavity. The distal ends of the third channel and the distal ends of the fourth channel are both connected to the connecting cavity of the outer tube.

[0009] The outer tube is provided with a return port, which is connected to the third channel and is located in the first cavity;

[0010] The PTFE component has a ring structure and is inserted into the distal end of the outer tube, with an insertion channel formed inside the PTFE component;

[0011] The guide head is inserted into the channel from the distal end, and the distal end of the cable is connected to the guide head.

[0012] Preferably, the outer tube 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, the second channel, the third channel and the fourth channel are all located within the first tube segment, the connecting cavity is formed within the second tube segment, and the PTFE component is inserted into the connecting cavity; the drain port is located in the first tube segment and close to the second tube segment, and the length of the second tube segment is no more than 1 cm.

[0013] Preferably, the number of the fourth channels is two.

[0014] Preferably, the first pipe section is provided with a first partition and a second partition, both of which extend along the length of the first pipe section. In the radial direction of the first pipe section, the first partition and the second partition are spaced apart to divide the first pipe section into a first space, a second space and a third space. The first space and the third space are respectively located on both sides of the second space. The first space constitutes the second channel and the third space constitutes the third channel.

[0015] The first channel and the two fourth channels together constitute the second space.

[0016] Preferably, the first partition includes a first straight plate, an arc-shaped plate, and a second straight plate connected in sequence, wherein the arc-shaped plate is bent in the direction opposite to the second partition.

[0017] The first partition and the second partition have the same structure. The curved plate on the second partition is bent in the opposite direction to the first partition, so that the two curved plates form the first channel.

[0018] Two first straight plates are arranged opposite each other, two second straight plates are arranged opposite each other, the two first straight plates form one fourth channel, and the two second straight plates form another fourth channel;

[0019] After the cable passes through the first channel, the outer wall of the cable is respectively attached to the two arc-shaped plates to separate the two fourth channels through the cable.

[0020] Preferably, the cross-sections of the second channel and the third channel are both fan-shaped, and their cross-sections are equal; the area of ​​the cross-section of the second channel is 4-5 times the area of ​​the cross-section of the fourth channel.

[0021] Preferably, the device further includes a bushing, 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, and the outer diameter of the second annular segment matches the outer diameter of the outer tube. The first annular segment is inserted into the connecting cavity, and the PTFE element is inserted into the second annular segment, so that the PTFE element is inserted into the connecting cavity through the bushing.

[0022] Preferably, the first annular segment has two mounting ports arranged radially opposite each other, each mounting port is fitted with an LED light, and the wires of the LED lights are led out through a fourth channel.

[0023] Preferably, a proximal space is formed within the proximal connector, and a partition plate is provided within the proximal space. The partition plate divides the proximal space into a first cavity and a second cavity. A connecting hole is provided on the partition plate, and the proximal end of the outer tube is inserted into the second cavity through the first cavity and the connecting hole.

[0024] The proximal connector is provided with a first connection port and a second connection port. The first connection port is connected to the first cavity, and the second connection port is connected to the second cavity. The first connection port is connected to a first liquid pipe, and the second connection port is connected to a second liquid pipe.

[0025] The beneficial effects of this invention are:

[0026] The near end of the cable is connected to a microwave generator. The microwaves emitted by the generator propagate to the far end through the cable and radiate outward through the PTFE component. During the operation, the far end of the ablation component extends into the fistula and emits microwaves through the PTFE component, which raises the temperature of the tissue at the PTFE component, causing cell structure destruction and coagulative necrosis, thereby achieving the purpose of treating anal fistula.

[0027] When treating anal fistula, saline solution is injected into the fourth channel through the second cavity. The saline solution enters the connecting cavity through the fourth channel and flows back into the first cavity through the third channel, thereby removing heat from the cable and distal components and preventing tissue burns caused by overheating in parts other than the PTFE component.

[0028] Physiological saline is injected into the second channel through the inlet tube, and the saline is sprayed out from the outlet, which is located on the distal side of the outer tube. This allows the saline to flush the fistula, remove secretions or necrotic tissue from the fistula, and improve the treatment effect and surgical safety.

[0029] In practice, the fistula can be flushed through the second channel first (at this time, the PTFE component does not emit microwaves), and then microwave therapy can be initiated (at this time, flushing is stopped). After treating a section of the fistula, the ablation component is pulled back a predetermined distance (e.g., 1 cm), and the flushing and treatment steps are repeated. This step-by-step operation helps to ensure cleanliness within the fistula, reduce interference from secretions, and achieve uniform treatment of the entire fistula.

[0030] In addition, the saline solution used for rinsing is delivered through an independent and closed second channel, which is completely isolated from the channels used for cooling (channels one, three, and four), ensuring that they do not interfere with each other and guaranteeing the function and safety of their respective flow paths. Attached Figure Description

[0031] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the structure of a microwave ablation component used to treat anal fistula;

[0033] Figure 2 This is the first cross-sectional view of the ablation component;

[0034] Figure 3 This is the second cross-sectional view of the ablation component;

[0035] Figure 4 This is the third sectional view of the ablation component;

[0036] Figure 5 This is a partial exploded view of the ablation component;

[0037] Figure 6 This is the fourth cross-sectional view of the ablation component.

[0038] In the diagram: 1. Outer tube; 2. Proximal connector; 3. Guide head; 4. Inlet tube; 5. First liquid tube; 6. Second liquid tube; 7. Cable; 8. PTFE component; 10. Bushing;

[0039] 12. Second channel; 13. Third channel; 14. Fourth channel; 121. Drain outlet; 131. Return outlet;

[0040] 21. First cavity; 22. Second cavity;

[0041] 101. First annular segment; 102. Second annular segment; 103. Mounting port. Detailed Implementation

[0042] The present invention is described below based on 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, but well-known methods, processes, procedures, and elements are not described in detail in order to avoid obscuring the essence of the present invention.

[0043] Furthermore, those skilled in the art should understand that the accompanying drawings provided herein are for illustrative purposes only and are not necessarily drawn to scale.

[0044] Unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as encompassing rather than being exclusive or exhaustive; that is, meaning "including but not limited to."

[0045] In the description of this invention, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0046] In this invention, "far" refers to the side closer to the patient's body during surgery; "near" refers to the side closer to the operator during surgery.

[0047] See Figures 1-6 This invention provides a microwave ablation assembly (hereinafter referred to as the "ablation assembly") for treating anal fistulas, comprising an outer tube 1, a cable 7, a guide head 3, a PTFE component 8, and a proximal connector 2.

[0048] The outer tube 1 forms a first channel, a second channel 12, a third channel 13 and a fourth channel 14, all of which extend along the axial direction of the outer tube 1, and the cable 7 passes through the first channel;

[0049] The proximal and distal ends of the second channel 12 are both closed. The side wall of the outer tube 1 is provided with an inlet and a outlet 121. The inlet and the outlet 121 are both connected to the second channel 12. The inlet is located on the proximal side of the outer tube 1, and the outlet 121 is located on the distal side of the outer tube 1. An inlet pipe 4 is connected to the inlet.

[0050] The proximal end of the outer tube 1 is connected to the proximal connector 2. The proximal connector 2 is provided with a first cavity 21 and a second cavity 22 that are separated from each other. The first cavity 21 is located on the distal side of the second cavity 22. The proximal end of the outer tube 1 extends into the second cavity 22. The proximal end of the third channel 13 is closed. The proximal end of the fourth channel 14 passes through the proximal end of the outer tube 1, so that the fourth channel 14 communicates with the second cavity 22. The distal ends of the third channel 13 and the fourth channel 14 are both connected to the connecting cavity of the outer tube 1.

[0051] The outer tube 1 is provided with a return port 131, which is connected to the third channel 13 and is located inside the first cavity 21;

[0052] The PTFE component 8 has a ring structure and is inserted into the distal end of the outer tube 1, with an insertion channel formed inside the PTFE component 8;

[0053] The guide head 3 is inserted into the channel from the distal end, and the distal end of the cable 7 is connected to the guide head 3.

[0054] When treating anal fistula, the direction and length of the fistula can be determined first by using a probe. Since there is often a certain amount of secretion in the fistula, the fistula is first flushed by a catheter to remove the secretion; then it is treated with an ablation device.

[0055] Specifically, the distal end of the ablation component extends into the fistula along the opening, reaching the blind end of the fistula. For fistulas with external and internal openings, it extends along the external opening, reaching the internal opening. The proximal end of cable 7 is connected to a microwave generator, which emits microwaves that propagate through cable 7 to the distal end. Since the distal end of cable 7 is connected to a guide head located at the distal end of the outer tube 1, the microwaves can be conducted along cable 7 to the distal end of the outer tube 1. The PTFE element 8 is inserted into the distal end of the outer tube 1. The microwaves are emitted outward through the PTFE element 8, acting on the tissue at the fistula site, causing the temperature of the tissue at the PTFE element 8 to rise, thereby breaking the cell structure and forming coagulative necrosis. By pulling the entire ablation component backward, the PTFE element 8 can be gradually pulled to the opening, thus moving along the entire fistula, thereby destroying the overall cell structure inside the fistula and achieving the purpose of treating anal fistula.

[0056] During treatment, the temperature of the cell structures affected by microwaves rises, causing the cells with higher temperatures to die. The thermal conductivity can also damage deeper cell structures, resulting in over-damage.

[0057] The proximal end of the fourth channel 14 is connected to the second cavity 22, so saline solution can be injected into the fourth channel 14 through the second cavity 22. The saline solution flows out from the distal end of the fourth channel 14 and enters the connecting cavity. The connecting cavity is located at the distal end of the ablation component, so the connecting cavity can absorb the heat at the distal end of the ablation component. The distal end of the third channel 13 is connected to the connecting cavity, so the saline solution with increased temperature in the connecting cavity can flow from distal to proximal through the third channel 13 and finally flow into the first cavity 21 through the return port 131. In this way, the second cavity 22 continuously outputs saline solution and the first cavity 21 continuously recovers saline solution, which can continuously remove the heat at the distal end of the ablation component, avoid the aforementioned over-damage, and improve the safety of the operation.

[0058] Furthermore, as mentioned earlier, the fistula contains secretions. Although it is flushed through a catheter, some secretions remain, which can affect the therapeutic effect of microwave treatment. The outer tube 1 of this invention is provided with a second channel 12, and both the distal and proximal ends of the second channel 12 are closed, so that the second channel 12 is not connected to the connecting cavity. That is to say, the second channel 12 is completely independent of the first channel, the third channel 13, and the fourth channel 14. In application, physiological saline is injected into the second channel 12 through the inlet tube 4. The physiological saline is discharged through the second channel 12 from the drain port 121. The drain port 121 is located on the distal side of the outer tube 1, that is, the drain port 121 is also located on the distal side of the ablation component. After the physiological saline is discharged from the drain port 121, it will immediately enter the fistula, thereby cleaning the excretions in the fistula and ensuring that there are basically no secretions in the fistula, thus ensuring the therapeutic effect.

[0059] In use, the fistula can be cleaned first through the second channel 12 (at this time, the PTFE component 8 does not emit microwaves), and then microwaves are emitted through the PTFE component 8 (at this time, the drainage port 121 no longer sprays out saline) for treatment. Then, the ablation component is pulled back a predetermined distance (e.g., 1 cm), and the above process is repeated. In this way, the fistula is flushed once before the predetermined distance is pulled, and then microwave treatment is performed again. This ensures that there are no secretions in the fistula and ensures the treatment effect.

[0060] In addition, the saline solution used to flush the fistula is delivered through the second channel 12. The second channel 12 is never connected to the first channel, the third channel 13, or the fourth channel 14. In other words, the cable 7 will not affect the saline solution passing through the second channel 12, ensuring the safety of the saline solution and improving the safety of the surgery.

[0061] The outer tube 1 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, the second channel 12, the third channel 13 and the fourth channel 14 are all located within the first tube segment. The connecting cavity is formed within the second tube segment. The PTFE component 8 is inserted into the connecting cavity. The drain port 121 is located in the first tube segment and close to the second tube segment. The length of the second tube segment is no more than 1 cm.

[0062] The length of the first pipe section is much greater than the length of the second pipe section. The first channel, the second channel 12, the third channel 13 and the fourth channel 14 all extend within the first pipe section. The second pipe section forms a connecting cavity. The distal end of the first channel is open, so the cable 7 can pass through the first channel into the connecting cavity. The distal ends of the third channel 13 and the fourth channel 14 are open, so that the distal ends of the third channel 13 and the fourth channel 14 are connected to the connecting cavity, thus connecting the two.

[0063] The drain port 121 is located close to the second tube section, so that the drain port 121 is located at the far end of the ablation assembly.

[0064] The number of the fourth channel 14 is two.

[0065] The first pipe section is provided with a first partition and a second partition. Both the first partition and the second partition extend along the length of the first pipe section. In the radial direction of the first pipe section, the first partition and the second partition are spaced apart to divide the first pipe section into a first space, a second space and a third space. The first space and the third space are respectively located on both sides of the second space. The first space constitutes the second channel 12 and the third space constitutes the third channel 13.

[0066] The first channel and the two fourth channels 14 together constitute the second space.

[0067] Along the axial direction of the first tube segment, at any point, the cross-section of the first septum remains unchanged, and the cross-section of the second septum also remains unchanged. Therefore, the space within the first tube segment is divided into three independent spaces by the first and second septums. This simplifies the configuration of the first channel, the second channel 12, the third channel 13, and the fourth channel 14, allowing four channels to be formed without the need for separate catheters. This also allows for a smaller outer diameter (below 5mm) of the outer tube 1 of the ablation component, facilitating its passage through the fistula and simplifying the surgical procedure.

[0068] The first partition includes a first straight plate, an arc-shaped plate, and a second straight plate connected in sequence, wherein the arc-shaped plate is bent in the direction opposite to the second partition.

[0069] The first partition and the second partition have the same structure. The curved plate on the second partition is bent in the opposite direction to the first partition, so that the two curved plates form the first channel.

[0070] Two first straight plates are arranged opposite each other, two second straight plates are arranged opposite each other, and the two first straight plates form one fourth channel 14, and the two second straight plates form another fourth channel 14;

[0071] After the cable 7 passes through the first channel, the outer wall of the cable 7 is respectively attached to the two arc-shaped plates to separate the two fourth channels 14 through the cable 7.

[0072] The first and second straight plates have rectangular cross-sections, while the arc plate has a fan-shaped cross-section. The center of the arc plate (cross-section) overlaps with the center of the first pipe segment (cross-section), creating a circular space (cross-section) between the two arc plates. This circular space corresponds to the first channel. The spaces between the two first straight plates and the two second straight plates respectively form two rectangular spaces (corresponding to the two fourth channels 14).

[0073] As can be seen, the first channel and the two fourth channels 14 are directly connected. The cable 7 passes through the first channel, so the saline solution flowing through the fourth channel 14 can directly contact the cable 7, thereby better removing the heat from the cable 7.

[0074] Furthermore, when cable 7 passes through the first channel, cable 7 (which has a circular cross-section) essentially completely fills the first channel, thus completely separating the two fourth channels 14 from each other.

[0075] Of course, even if the cable 7 and the first channel are gap-fitted, the first channel can also serve as the fourth channel 14 to allow the saline solution in the second cavity 22 to flow into the connecting cavity.

[0076] The cross-sections of the second channel 12 and the third channel 13 are both fan-shaped, and their cross-sections are equal; the area of ​​the cross-section of the second channel 12 is 4-5 times the area of ​​the cross-section of the fourth channel 14.

[0077] The second channel 12 allows saline solution to be used to flush the fistula. The larger cross-sectional area of ​​the second channel 12 facilitates the flow of a larger amount of saline solution, thereby improving the flushing effect on the secretions within the fistula and ensuring the surgical outcome. There are two fourth channels 14. The fourth channels 14 allow saline solution to be used to cool the fistula and then return to the first cavity 21 through the third channel 13. The cross-sectional area of ​​the third channel 13 is more than twice that of the fourth channel 14, resulting in a higher flow velocity of saline solution within the fourth channel 14. Therefore, when the saline solution enters the connecting cavity from the fourth channel 14, it can fully agitate the saline solution within the connecting cavity, thereby effectively cooling the distal part of the ablation component. At the same time, the larger cross-sectional area of ​​the third channel 13 facilitates the return of the heated saline solution, ensuring the cooling effect.

[0078] The ablation assembly also includes a bushing 10, which includes a first annular segment 101 and a second annular segment 102 connected to each other. The outer diameter of the first annular segment 101 matches the inner diameter of the connecting cavity, and the outer diameter of the second annular segment 102 matches the outer diameter of the outer tube 1. The first annular segment 101 is inserted into the connecting cavity, and the PTFE element 8 is inserted into the second annular segment 102, so that the PTFE element 8 is inserted into the connecting cavity through the bushing 10.

[0079] The first annular segment 101 is provided with two mounting ports 103 arranged radially opposite each other. Each mounting port 103 is fitted with an LED light, and the wires of the LED lights are led out through the fourth channel 14.

[0080] The bushing 10 facilitates the installation of LED lights. During surgery, the LED lights can emit light to illuminate the distal end of the ablation component, which can be directly seen by medical staff through the tissue. This allows medical staff to understand the location of the distal end of the ablation component, facilitating the smooth progress of the surgery.

[0081] In addition, one of the two LED lights is a cool white LED used for general lighting, while the other LED light can emit light with a wavelength of 240-280nm. It uses the principle of ultraviolet sterilization 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.

[0082] Of course, a temperature sensor can also be installed inside the connecting cavity to detect the temperature at the distal end of the ablation component, so as to control the flow rate of saline in the fourth channel 14 and ensure the smooth progress of the operation.

[0083] A proximal space is formed within the proximal connector 2. A partition plate is provided within the proximal space, which divides the proximal space into a first cavity 21 and a second cavity 22. A connecting hole is provided on the partition plate. The proximal end of the outer tube 1 is inserted into the second cavity 22 through the first cavity 21 and the connecting hole.

[0084] The proximal connector 2 is provided with a first connection port and a second connection port. The first connection port is connected to the first cavity 21, and the second connection port is connected to the second cavity 22. The first connection port is externally connected to a first liquid pipe 5, and the second connection port is externally connected to a second liquid pipe 6.

[0085] The first liquid pipe 5 is connected to the first cavity 21, and the second liquid pipe 6 is connected to the second cavity 22. Physiological saline is pumped into the second cavity 22 through the second liquid pipe 6. The physiological saline flows into the connecting cavity through the fourth channel 14 and returns to the first cavity 21 through the third channel 13. It then flows out through the first liquid pipe 5, forming a closed-loop cooling circuit, thereby achieving continuous cooling of the front end of the ablation component.

[0086] It should be understood that the above embodiments are merely exemplary and not restrictive. Various obvious or equivalent modifications or substitutions that can be made by those skilled in the art regarding the above details without departing from the basic principles of the present invention will be included within the scope of the claims of the present invention.

Claims

1. A microwave ablation assembly for treating anal fistula, characterized in that, Includes outer tubing, cable, guide head, PTFE components, and near-end connectors. The outer tube forms a first channel, a second channel, a third channel, and a fourth channel, all of which extend along the axial direction of the outer tube, and the cable passes through the first channel; The proximal and distal ends of the second channel are both closed. The side wall of the outer tube is provided with an inlet and an outlet. The inlet and the outlet are both connected to the second channel. The inlet is located on the proximal side of the outer tube, and the outlet is located on the distal side of the outer tube. An inlet pipe is connected to the inlet. The proximal end of the outer tube is connected to the proximal end connector. The proximal end connector is provided with a first cavity and a second cavity that are separated from each other. The first cavity is located on the distal side of the second cavity. The proximal end of the outer tube extends into the second cavity. The proximal end of the third channel is closed. The proximal end of the fourth channel passes through the proximal end of the outer tube, so that the fourth channel communicates with the second cavity. The distal ends of the third channel and the distal ends of the fourth channel are both connected to the connecting cavity of the outer tube. The outer tube is provided with a return port, which is connected to the third channel and is located in the first cavity; The PTFE component has a ring structure and is inserted into the distal end of the outer tube, with an insertion channel formed inside the PTFE component; The guide head is inserted into the channel from the distal end, and the distal end of the cable is connected to the guide head; The outer tube 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, the second channel, the third channel and the fourth channel are all located within the first tube segment. The connecting cavity is formed within the second tube segment, and the PTFE component is inserted into the connecting cavity. The drain outlet is located in the first tube segment and close to the second tube segment. The length of the second tube segment is no more than 1 cm.

2. The microwave ablation assembly for treating anal fistula according to claim 1, characterized in that, The fourth channel has two channels.

3. The microwave ablation assembly for treating anal fistula according to claim 2, characterized in that, The first pipe section is provided with a first partition and a second partition. Both the first partition and the second partition extend along the length of the first pipe section. In the radial direction of the first pipe section, the first partition and the second partition are spaced apart to divide the first pipe section into a first space, a second space and a third space. The first space and the third space are respectively located on both sides of the second space. The first space constitutes the second channel and the third space constitutes the third channel. The first channel and the two fourth channels together constitute the second space.

4. The microwave ablation assembly for treating anal fistula according to claim 3, characterized in that, The first partition includes a first straight plate, an arc-shaped plate, and a second straight plate connected in sequence, wherein the arc-shaped plate is bent in the direction opposite to the second partition. The first partition and the second partition have the same structure. The curved plate on the second partition is bent in the opposite direction to the first partition, so that the two curved plates form the first channel. Two first straight plates are arranged opposite each other, two second straight plates are arranged opposite each other, the two first straight plates form one fourth channel, and the two second straight plates form another fourth channel; After the cable passes through the first channel, the outer wall of the cable is respectively attached to the two arc-shaped plates to separate the two fourth channels through the cable.

5. The microwave ablation assembly for treating anal fistula according to claim 4, characterized in that, The cross-sections of the second channel and the third channel are both fan-shaped, and their cross-sections are equal; the area of ​​the cross-section of the second channel is 4-5 times the area of ​​the cross-section of the fourth channel.

6. The microwave ablation assembly for treating anal fistula according to any one of claims 1-5, characterized in that, It also includes a bushing, 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, and the outer diameter of the second annular segment matches the outer diameter of the outer tube. The first annular segment is inserted into the connecting cavity, and the PTFE element is inserted into the second annular segment, so that the PTFE element is inserted into the connecting cavity through the bushing.

7. The microwave ablation assembly for treating anal fistula according to claim 6, characterized in that, The first annular segment has two mounting ports arranged radially opposite each other, and each mounting port is fitted with an LED light. The wires of the LED lights are led out through the fourth channel.

8. The microwave ablation assembly for treating anal fistula according to any one of claims 1-5, characterized in that, A proximal space is formed within the proximal connector. A partition plate is provided within the proximal space, which divides the proximal space into a first cavity and a second cavity. A connecting hole is provided on the partition plate. The proximal end of the outer tube is inserted into the second cavity through the first cavity and the connecting hole. The proximal connector is provided with a first connection port and a second connection port. The first connection port is connected to the first cavity, and the second connection port is connected to the second cavity. The first connection port is connected to a first liquid pipe, and the second connection port is connected to a second liquid pipe.

Images