A tee structure and endoscope

Abstract

The utility model discloses an embodiment provides a kind of tee structure and endoscope, it is related to medical instrument technical field.Tee structure includes first mounting seat, second mounting seat and third mounting seat, and first mounting seat is equipped with working channel;Second mounting seat is connected with first mounting seat, and second mounting seat is equipped with instrument channel;Third mounting seat is simultaneously connected with first mounting seat and second mounting seat, and third mounting seat is equipped with suction channel;Wherein, working channel, instrument channel and suction channel are interconnected, and suction channel is equipped with contraction mouth in the end close to working channel and instrument channel, and contraction mouth is simultaneously communicated with working channel and instrument channel.The tee structure can ensure that wire and the like instrument are smoothly reversed in working channel, avoid misentry suction channel, to improve the operation efficiency, alleviate the pain of patient.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a three-way structure and an endoscope. Background Technology

[0002] In ureteroscopic surgery, to ensure the flexible endoscope can pass smoothly through the ureteral lumen and be accurately positioned to the surgical site, current techniques typically require the use of a rigid ureteroscope and a urinary guidewire. The specific procedure is as follows: First, the rigid ureteroscope is inserted into the bladder through the urethra. After locating the ureteral orifice on the affected side, the guidewire is inserted through the rigid endoscope channel and the ureteral channel until it reaches the renal pelvis. Then, the rigid ureteroscope is withdrawn, leaving the guidewire in the patient's body. Next, the guidewire is reversed and inserted into the working channel of the flexible endoscope, and then exits through the instrument channel of the endoscope handle. Finally, guided by the guidewire, the flexible endoscope is successfully positioned to reach the renal pelvis.

[0003] However, because the instrument channel and suction channel are connected to the working channel via a three-way connector, there is a risk of the guidewire accidentally entering the suction channel during reverse piercing. This accidental entry not only prevents the reverse piercing procedure from proceeding smoothly but also affects the surgical process, prolongs the operation time, and increases patient discomfort. Utility Model Content

[0004] The purpose of this invention is to provide a three-way structure and endoscope that can ensure the guidewire can be smoothly reversed in the working channel and avoid accidentally entering the suction channel, thereby improving surgical efficiency and reducing patient pain.

[0005] The embodiments of this utility model are implemented as follows:

[0006] In a first aspect, this utility model provides a three-way structure, comprising:

[0007] A first mounting base, wherein the first mounting base is provided with a working channel;

[0008] A second mounting base, connected to the first mounting base, and having an instrument channel; and

[0009] A third mounting base is connected to both the first mounting base and the second mounting base, and the third mounting base is provided with a suction channel;

[0010] The working channel, the instrument channel, and the suction channel are interconnected, and the suction channel has a constriction port at one end near the working channel and the instrument channel. The constriction port is connected to both the working channel and the instrument channel. By setting the constriction port, the probability of the guidewire accidentally entering the suction channel during the reverse insertion process can be reduced.

[0011] In an optional embodiment, the three-way structure further includes an instrument channel tube, which is disposed on the second mounting base and communicates with the instrument channel; the instrument channel tube is provided with a guide extension at one end near the instrument channel, the guide extension is located inside the instrument channel, and the guide extension is inclined toward the contraction port.

[0012] In an optional embodiment, the second mounting base is further provided with a first mounting cavity, which is simultaneously connected to the instrument channel and the contraction port, and the guide extension is disposed in the first mounting cavity; by the inclined setting of the guide extension, a guiding effect is provided for the guide wire, further reducing the probability of the guide wire accidentally entering the suction channel during the reverse penetration process.

[0013] In an optional embodiment, the inner wall of the guide extension is provided with a first guide groove; and / or,

[0014] The guide extension has an avoidance notch at one end near the contraction opening.

[0015] In an optional embodiment, the second mounting base is further provided with a second mounting cavity, the second mounting cavity, the instrument channel and the working channel are connected in sequence, and at least a portion of the instrument channel tube is disposed in the second mounting cavity.

[0016] In an optional embodiment, one of the inner wall of the second mounting cavity and the outer wall of the instrument channel tube is provided with a second guide groove, and the other is provided with a guide post, the guide post cooperating with the second guide groove; and / or,

[0017] The inner wall of the second mounting cavity and the outer wall of the instrument channel tube are provided with a groove and a snap-fit ​​protrusion, respectively, and the snap-fit ​​protrusion cooperates with the groove. The second guide groove and guide post facilitate the installation of the instrument channel tube, and the groove and snap-fit ​​protrusion improve the installation stability of the instrument channel tube.

[0018] In an optional embodiment, the outer wall of the instrument channel tube is provided with a first annular groove, and the tee structure further includes a first sealing ring, which is disposed in the first annular groove and abuts against the inner wall of the second mounting cavity.

[0019] In an optional embodiment, the outer wall of the instrument channel tube is provided with a second annular groove, the second annular groove being spaced apart from the first annular groove and located on the side of the first annular groove away from the guide extension;

[0020] The three-way structure also includes a second sealing ring, which is disposed in the second annular groove and is used to abut against the inner sidewall of the operating part.

[0021] In an optional embodiment, the working channel is provided with mounting steps; and / or,

[0022] The outer wall of the third mounting base is provided with anti-detachment barbs; and / or,

[0023] The three-way structure also includes a fixing seat, which is connected to both the first mounting seat and the third mounting seat, and the fixing seat has a fixing hole.

[0024] Secondly, this utility model provides an endoscope, including the three-way structure described in any of the foregoing embodiments.

[0025] The beneficial effects of this utility model embodiment include:

[0026] The three-way connector includes a first mounting base, a second mounting base, and a third mounting base. The first mounting base has a working channel; the second mounting base connects to the first mounting base and has an instrument channel; the third mounting base connects to both the first and second mounting bases and has a suction channel. The working channel, instrument channel, and suction channel are interconnected, and the suction channel has a constriction port at the end near both the working and instrument channels, which communicates with both. By incorporating the constriction port, the diameter of the suction channel gradually decreases towards the working and instrument channels, preventing the guidewire from accidentally entering the suction channel during reverse insertion. This ensures that the guidewire and other instruments pass smoothly through the working channel and accurately exit through the instrument channel, thereby improving surgical efficiency and reducing patient discomfort.

[0027] The endoscope includes a three-way valve structure, which has all the beneficial effects of such a three-way valve structure. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an endoscope provided in an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the three-way structure provided in an embodiment of this utility model;

[0031] Figure 3 A cross-sectional view of the three-way structure provided in an embodiment of this utility model;

[0032] Figure 4 A first-view structural schematic diagram of the instrument channel tube provided in an embodiment of this utility model;

[0033] Figure 5 A second-view structural schematic diagram of the instrument channel tube provided in an embodiment of this utility model;

[0034] Figure 6 This is a partial structural diagram of the three-way structure provided in an embodiment of the present utility model.

[0035] Icons: 1000 - Endoscope; 100 - Three-way structure; 10 - First mounting base; 11 - Working channel; 12 - Mounting step; 20 - Second mounting base; 21 - Instrument channel; 22 - First mounting cavity; 23 - Second mounting cavity; 24 - Second guide groove; 25 - Slot; 30 - Third mounting base; 31 - Suction channel; 32 - Constriction port; 33 - Anti-dislodge barb; 40 - Instrument channel tube; 41 - Guide extension; 411 - First guide groove; 412 - Avoidance notch; 42 - Guide post; 43 - Snap-fit ​​protrusion; 44 - First annular groove; 45 - Second annular groove; 51 - First sealing ring; 52 - Second sealing ring; 60 - Fixing base; 61 - Fixing hole; 200 - Operating part; 201 - Handle housing; 202 - Suction tube; 203 - Working channel tube; 300 - Insertion part. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] As described in the background section, in flexible ureteroscopic surgery, because the instrument channel and suction channel are connected to the working channel via a three-way connector, there is a risk of accidental entry into the suction channel during guidewire retraction. This accidental entry not only prevents the retraction procedure from proceeding smoothly but also affects the surgical process, prolongs the operation time, and increases patient discomfort.

[0043] Based on this, please refer to Figures 1-6 The present invention provides a three-way structure 100 and an endoscope 1000, which can effectively improve the aforementioned technical problems. Specifically, it can ensure that the guidewire can be smoothly reversed within the working channel 11, avoiding accidental entry into the suction channel 31, thereby improving surgical efficiency and reducing patient discomfort. The three-way structure 100 and the endoscope 1000 will be described in detail below.

[0044] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the endoscope 1000 provided in this embodiment, combined with... Figure 1The endoscope 1000 includes a three-way structure 100, an operating part 200, and an insertion part 300. The three-way structure 100 is disposed on the operating part 200, and the insertion part 300 is connected to the operating part 200.

[0045] Specifically, the operating part 200 includes a handle housing 201, a suction tube 202, and a working channel tube 203. A three-way structure 100 is disposed inside the handle housing 201. The suction tube 202 and the working channel tube 203 are respectively connected to the corresponding channels in the three-way structure 100, and the working channel tube 203 extends into the insertion part 300 through the space inside the handle housing 201.

[0046] As will be readily apparent to those skilled in the art, the endoscope 1000 may also include other structures such as the tip, which will not be described in detail in this embodiment.

[0047] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the tee structure 100 provided in this embodiment. Figure 3 This is a cross-sectional view of the tee structure 100 provided in this embodiment. (In conjunction with...) Figure 2 and Figure 3 The three-way structure 100 includes a first mounting base 10, a second mounting base 20, and a third mounting base 30. The first mounting base 10 has a working channel 11; the second mounting base 20 is connected to the first mounting base 10 and has an instrument channel 21; the third mounting base 30 is connected to both the first mounting base 10 and the second mounting base 20 and has a suction channel 31. The working channel 11, the instrument channel 21, and the suction channel 31 are interconnected, and the suction channel 31 has a constriction port 32 at one end near the working channel 11 and the instrument channel 21, which is connected to both the working channel 11 and the instrument channel 21.

[0048] It is easy to understand that by setting the constriction port 32, the diameter of the suction channel 31 gradually decreases along the direction close to the working channel 11 and the instrument channel 21, so that the guidewire is prevented from accidentally entering the suction channel 31 during the reverse passage process. This ensures that the guidewire and other instruments can be smoothly reversed from the working channel 11 and accurately passed out from the instrument channel 21, thereby improving surgical efficiency and reducing patient pain.

[0049] To facilitate the entry and exit of instruments during surgery through the instrument channel 21, in this embodiment, the three-way structure 100 further includes an instrument channel tube 40, which is disposed on the second mounting base 20 and communicates with the instrument channel 21. That is, the guidewire can pass through the instrument channel 21 and exit from the instrument channel tube 40.

[0050] Please refer to Figure 4 and Figure 5 , Figure 4 This is a first-view structural schematic diagram of the instrument channel tube 40 provided in this embodiment. Figure 5 This is a structural schematic diagram of the instrument channel tube 40 provided in this embodiment from a second perspective. (Combined with...) Figures 2-5 To improve the smoothness of the guidewire's reversal through the working channel 11 and enhance work efficiency, a guide extension 41 is provided at one end of the instrument channel tube 40 near the instrument channel 21. The guide extension 41 is located within the instrument channel 21 and is inclined towards the contraction port 32. Understandably, the inclined arrangement of the guide extension 41 provides guidance for the guidewire, ensuring that it is smoothly guided into the instrument channel tube 40 after contact with the guide extension 41. This further ensures the guidewire's smooth reversal within the working channel 11 and prevents it from accidentally entering the suction channel 31.

[0051] For easier installation of the guide extension 41, please refer to... Figure 6 , Figure 6 This is a partial structural diagram of the tee structure 100 provided in this embodiment, combined with... Figure 3 and Figure 6 The second mounting base 20 is also provided with a first mounting cavity 22, which is connected to both the instrument channel 21 and the contraction port 32. The guide extension 41 is disposed in the first mounting cavity 22.

[0052] like Figure 3 As shown, it should be noted that the cross-sectional dimension of the channel formed by the first mounting cavity 22 and the instrument channel 21 is larger than the cross-sectional dimension of the working channel 11 and the suction channel 31. In other words, when the guidewire is pierced in reverse, it can enter the channel formed by the first mounting cavity 22 and the instrument channel 21 more smoothly, without accidentally entering the suction channel 31, thus further improving surgical efficiency.

[0053] Combination Figure 4 and Figure 5 In order to better guide the guide wire, the inner wall of the guide extension 41 is provided with a first guide groove 411.

[0054] Furthermore, in order to avoid the contraction opening 32 and ensure the normal use of the suction channel 31 during the surgical procedure, the guide extension 41 is provided with a clearance notch 412 at the end near the contraction opening 32.

[0055] Please continue to combine Figure 3 and Figure 6The second mounting base 20 also has a second mounting cavity 23, which is sequentially connected to the instrument channel 21 and the working channel 11. At least a portion of the instrument channel tube 40 is disposed within the second mounting cavity 23. That is, in this embodiment, the second mounting base 20 and the instrument channel tube 40 are installed by a sleeve connection, that is, the second mounting base 20 is sleeved on the instrument channel tube 40, so that a portion of the instrument channel tube 40 is installed within the second mounting cavity 23.

[0056] To facilitate the connection and installation of the instrument channel tube 40 and the second mounting base 20, please refer to... Figures 2-6 The second mounting cavity 23 has a second guide groove 24 on one of its inner sidewall and the instrument channel tube 40 has a guide post 42 on the other, and the guide post 42 cooperates with the second guide groove 24. It should be noted that in this embodiment, the second guide groove 24 is provided on the inner sidewall of the second mounting cavity 23 and the guide post 42 is provided on the outer sidewall of the instrument channel tube 40; of course, in other embodiments, the guide post 42 may also be provided on the inner sidewall of the second mounting cavity 23 and the second guide groove 24 may be provided on the outer sidewall of the instrument channel tube 40.

[0057] Furthermore, to improve the installation stability of the instrument channel tube 40 and the second mounting base 20, one of the inner sidewall of the second mounting cavity 23 and the outer sidewall of the instrument channel tube 40 is provided with a groove 25, and the other is provided with a snap-fit ​​protrusion 43, which engages with the groove 25. It should be noted that in this embodiment, specifically, the inner sidewall of the second mounting cavity 23 is provided with a groove 25, and the outer sidewall of the instrument channel tube 40 is provided with a snap-fit ​​protrusion 43; of course, in other embodiments, the inner sidewall of the second mounting cavity 23 may also be provided with a snap-fit ​​protrusion 43, and the outer sidewall of the instrument channel tube 40 may be provided with a groove 25.

[0058] Additionally, it should be noted that the snap-fit ​​protrusion 43 or the instrument channel tube 40 itself can be an elastic structure, thereby facilitating the snap-fit ​​installation or removal of the snap-fit ​​protrusion 43. Furthermore, in this embodiment, the snap-fit ​​protrusion 43 is provided with a bevel, which can serve as a guide during installation, making it easier to snap into the slot 25.

[0059] To further improve the installation stability of the instrument channel tube 40 and the second mounting base 20, the number of slots 25 and engaging protrusions 43 can be set to multiple, with each slot 25 corresponding to one engaging protrusion 43. For example, in this embodiment, the number of slots 25 and engaging protrusions 43 is specifically two. Of course, in other embodiments, the number of slots 25 and engaging protrusions 43 can also be three, four, or five, etc.

[0060] Please combine Figures 3-5In order to improve the sealing performance of the instrument channel tube 40 and the second mounting base 20 after installation, the outer wall of the instrument channel tube 40 is provided with a first annular groove 44, and the tee structure 100 also includes a first sealing ring 51. The first sealing ring 51 is disposed in the first annular groove 44 and abuts against the inner wall of the second mounting cavity 23.

[0061] Combination Figures 1-4 When the instrument channel tube 40 is installed with the operating part 200, a portion of it is located inside the handle housing 201, and the other portion extends out from inside the handle housing 201 to facilitate connection with other surgical instruments. Therefore, to improve the sealing performance after the instrument channel tube 40 and the operating part 200 are installed, in this embodiment, the outer wall of the instrument channel tube 40 is provided with a second annular groove 45. The second annular groove 45 is spaced apart from the first annular groove 44 and is located on the side of the first annular groove 44 away from the guide extension 41. The tee structure 100 also includes a second sealing ring 52, which is disposed in the second annular groove 45 and is used to abut against the inner wall of the operating part 200.

[0062] Specifically in this embodiment, the second sealing ring 52 abuts against the inner wall of the handle housing 201, thereby preventing external liquids or moisture from entering the internal space of the handle housing 201 through the gap between the handle housing 201 and the instrument channel tube 40, thus improving the sealing effect.

[0063] It should be noted that in this embodiment, the working channel tube 203 is installed on the first mounting base 10 and communicates with the working channel 11; while the suction tube 202 is installed on the third mounting base 30 and communicates with the suction channel 31.

[0064] Therefore, in order to improve the installation stability of the working channel pipe 203, an installation step 12 is provided inside the working channel 11. That is, one end of the working flexible hose is inserted into the installation step 12 and abuts against the inner wall of the working channel 11, thereby achieving a stable installation.

[0065] To improve the installation stability of the suction tube 202, the outer wall of the third mounting base 30 is provided with an anti-detachment barb 33. That is, one end of the suction tube 202 is sleeved on the third mounting base 30, and the inner wall of the suction tube 202 abuts against the anti-detachment barb 33, thereby achieving a stable installation.

[0066] In addition, to facilitate the overall fixing of the three-way structure 100 inside the handle housing 201, in this embodiment, the three-way structure 100 also includes a fixing seat 60. The fixing seat 60 is connected to both the first mounting seat 10 and the third mounting seat 30, and the fixing seat 60 has a fixing hole 61. It is easy to understand that screws or bolts or other fasteners can be inserted into the fixing hole 61 and connected and fixed to the handle housing 201, thereby improving the overall installation stability of the three-way structure 100.

[0067] In summary, the embodiments of this utility model provide a three-way structure 100 and an endoscope 1000. The three-way structure 100 includes a first mounting base 10, a second mounting base 20, and a third mounting base 30. The first mounting base 10 is provided with a working channel 11. The second mounting base 20 is connected to the first mounting base 10 and is provided with an instrument channel 21. The third mounting base 30 is connected to both the first mounting base 10 and the second mounting base 20 and is provided with a suction channel 31. The working channel 11, the instrument channel 21, and the suction channel 31 are interconnected. The suction channel 31 is provided with a constriction port 32 at one end near the working channel 11 and the instrument channel 21, and the constriction port 32 is connected to both the working channel 11 and the instrument channel 21. It is easy to understand that by setting the constriction port 32, the diameter of the suction channel 31 gradually decreases along the direction close to the working channel 11 and the instrument channel 21, so that the guidewire is prevented from accidentally entering the suction channel 31 during the reverse passage process. This ensures that the guidewire and other instruments can be smoothly reversed from the working channel 11 and accurately passed out from the instrument channel 21, thereby improving surgical efficiency and reducing patient pain.

[0068] The endoscope 1000 includes a three-way structure 100, which has all the functions and benefits of the three-way structure 100.

[0069] The above description is merely a specific embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A three-way structure, characterized in that, include: The first mounting base (10) is provided with a working channel (11); A second mounting base (20) is connected to the first mounting base (10), and the second mounting base (20) is provided with an instrument channel (21); and A third mounting base (30) is connected to both the first mounting base (10) and the second mounting base (20), and the third mounting base (30) is provided with a suction channel (31); The working channel (11), the instrument channel (21) and the suction channel (31) are interconnected, and the suction channel (31) has a contraction port (32) at one end near the working channel (11) and the instrument channel (21), and the contraction port (32) is connected to both the working channel (11) and the instrument channel (21).

2. The tee structure according to claim 1, characterized in that, The three-way structure (100) further includes an instrument channel tube (40), which is disposed on the second mounting base (20) and communicates with the instrument channel (21); the instrument channel tube (40) has a guide extension (41) at one end near the instrument channel (21), the guide extension (41) is located inside the instrument channel (21), and the guide extension (41) is inclined toward the contraction port (32).

3. The tee structure according to claim 2, characterized in that, The second mounting base (20) is also provided with a first mounting cavity (22), which is connected to both the instrument channel (21) and the contraction port (32), and the guide extension (41) is disposed in the first mounting cavity (22).

4. The tee structure according to claim 2, characterized in that, The inner wall of the guide extension (41) is provided with a first guide groove (411); and / or, The guide extension (41) has an avoidance notch (412) at one end near the contraction opening (32).

5. The tee structure according to claim 2, characterized in that, The second mounting base (20) is also provided with a second mounting cavity (23), the second mounting cavity (23), the instrument channel (21) and the working channel (11) are connected in sequence, and at least a portion of the instrument channel tube (40) is disposed in the second mounting cavity (23).

6. The tee structure according to claim 5, characterized in that, One of the inner wall of the second mounting cavity (23) and the outer wall of the instrument channel tube (40) is provided with a second guide groove (24), and the other is provided with a guide post (42), the guide post (42) cooperating with the second guide groove (24); and / or, The inner wall of the second mounting cavity (23) and the outer wall of the instrument channel tube (40) are provided with a slot (25) and a snap-fit ​​protrusion (43), which engages with the slot (25).

7. The tee structure according to claim 5, characterized in that, The outer wall of the instrument channel tube (40) is provided with a first annular groove (44), and the three-way structure (100) further includes a first sealing ring (51). The first sealing ring (51) is disposed in the first annular groove (44) and abuts against the inner wall of the second mounting cavity (23).

8. The tee structure according to claim 7, characterized in that, The outer wall of the instrument channel tube (40) is provided with a second annular groove (45), the second annular groove (45) is spaced apart from the first annular groove (44), and is located on the side of the first annular groove (44) away from the guide extension (41); The three-way structure (100) further includes a second sealing ring (52), which is disposed in the second annular groove (45) and is used to abut against the inner wall of the operating part (200).

9. The tee structure according to claim 1, characterized in that, The working channel (11) is provided with an installation step (12); and / or, The outer wall of the third mounting base (30) is provided with anti-detachment barbs (33); and / or, The three-way structure (100) also includes a fixing seat (60), which is connected to both the first mounting seat (10) and the third mounting seat (30), and the fixing seat (60) has a fixing hole (61).

10. An endoscope, characterized in that, Includes the tee structure (100) as described in any one of claims 1-9.

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