Arthroscope sheath assembly and arthroscope assembly

Abstract

An arthroscope sheath assembly and an arthroscope assembly relate to the field of surgical instruments and comprise a sheath body and two valves. The sheath main body is provided with a flow channel; each valve comprises a valve body and a valve element, the valve bodies are installed on the outer sheath body, and the two valve bodies are located at the same height of the outer sheath body and distributed in the circumferential direction of the outer sheath body at intervals. The valve body communicates with the flowing channel. The valve core comprises a core body and a handle which are connected, the core body is rotatably matched with the valve body, and the core body is used for adjusting on-off of the valve body; each handle is provided with a first force arm and a second force arm which are connected, the extending directions of the first force arm and the second force arm are opposite, and the first force arm is shorter than the second force arm. According to the design of the arthroscope sheath assembly, the problem that handles collide when the two valves are controlled can be solved, the operation convenience and flexibility are improved, the operation difficulty is reduced, and the operation efficiency and precision are improved.

Description

Technical Field

[0001] This utility model relates to the field of surgical instruments, and more specifically, to an arthroscopic outer sheath assembly and an arthroscopic assembly. Background Technology

[0002] Arthroscopy is a minimally invasive surgical technique used to diagnose and treat various problems within joints. It primarily uses a small camera (arthoscope) mounted at the tip and other miniature tools to observe and manipulate the internal structures of the joint, thereby minimizing damage to surrounding tissues. Generally, the arthoscope's tip has a light source and camera, and it communicates with a smart terminal to transmit images to a monitor in real time. During use, the outer sheath is first inserted into the patient's body, and then the arthoscope itself is inserted inside the sheath. For fluid delivery, the outer sheath typically has two valves: one for introducing fluid into the body and the other for draining fluid.

[0003] The inventors discovered in their research that the existing arthroscopic sheaths have at least the following drawbacks:

[0004] The valve controls the flow by turning its handle. When two valve handles are turned, they are prone to interference and collision, making operation inconvenient. Utility Model Content

[0005] The purpose of this invention includes, for example, providing an arthroscopic outer sheath assembly and an arthroscopic assembly that can improve the problem of handle collision when operating two valves, improve the convenience and flexibility of operation, reduce the difficulty of operation, and improve the efficiency of operation.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, this utility model provides an arthroscopic outer sheath assembly, comprising an outer sheath body and two valves, wherein:

[0008] The outer sheath body is provided with a flow channel; each valve includes a valve body and a valve core, the valve body is installed on the outer sheath body, two valve bodies are located at the same height on the outer sheath body and are arranged at intervals in the circumferential direction of the outer sheath body; the valve body communicates with the flow channel; the valve core includes a connected core and a handle, the core is rotatably engaged with the valve body, and the core is used to adjust the opening and closing of the valve body;

[0009] Each of the handles has a first lever arm and a second lever arm connected together, the first lever arm and the second lever arm extending in opposite directions, and the length of the first lever arm being shorter than the length of the second lever arm.

[0010] In an optional embodiment, the valve core has a first position and a second position that can be switched between each other. When in the first position, the valve core closes the valve body; when in the second position, the valve core opens the valve body, and the first lever arm is located on the side of the second lever arm closer to the outer sheath body.

[0011] Based on the above scheme, when the valve core is rotated to adjust the state of the valve body, the two first lever arms are always on the side close to each other. Since the length of the two first lever arms is short, the probability of interference and collision between the two first lever arms is greatly reduced, making the operation convenient and flexible.

[0012] In an optional embodiment, the distance between the cores of the two valve bodies is L, and the sum of the lengths of the two first lever arms is L1, where L ≥ L1.

[0013] Based on the above scheme, since the two first lever arms are always located close to each other on the inner side when the control valve core rotates, and since the sum of the lengths of the two first lever arms is no greater than the distance between the two cores, the two first lever arms will not interfere with each other or collide, making the operation safe and reliable.

[0014] In an optional embodiment, the valve body is provided with a first limiting structure, and the core is provided with a second limiting structure; when the core is in the first position or the second position, the second limiting structure contacts the corresponding position of the first limiting structure to limit the rotation range of the core.

[0015] Based on the above scheme, when the valve core rotates relative to the valve body, the second limiting structure rotates together with the core relative to the first limiting structure on the valve body. Furthermore, the second limiting structure can contact the first limiting structure during rotation, thereby restricting the second limiting structure from continuing to rotate through the first limiting structure, thus limiting the valve core from continuing to rotate. This achieves a rigid limitation on the rotation range through mechanical means, improving the valve control accuracy.

[0016] In an optional embodiment, the first limiting structure includes a first protrusion and a second protrusion, the first protrusion and the second protrusion being arranged at intervals in the circumferential direction of the valve body; the first protrusion has a first side and a second side in a preset circumferential direction, and the second protrusion has a third side and a fourth side in the preset circumferential direction; the second limiting structure includes a third protrusion and a fourth protrusion, the third protrusion and the fourth protrusion being arranged at intervals in the circumferential direction of the core body; the third protrusion is located between the first side and the fourth side, and the fourth protrusion is located between the second side and the third side.

[0017] Based on the above scheme, during the rotation of the valve core relative to the valve body, when the third protrusion rotates to contact the first side, the fourth protrusion is simultaneously in contact with the third side. At this point, the valve core cannot continue to rotate. This position can be set as either the valve body closed or the valve body fully open. When it is necessary to adjust the valve body state, the valve core can only be rotated in the opposite direction to avoid misoperation and improve operating efficiency. At this time, the third protrusion moves away from the first side and closer to the fourth side, and the fourth protrusion moves away from the third side and closer to the second side. When the third protrusion contacts the fourth side, the fourth protrusion also contacts the second side, thus realizing the adjustment of the valve body state.

[0018] In an optional implementation, a guide mark is provided on the first lever arm or the second lever arm.

[0019] Based on the above scheme, the working status of the valve can be intuitively reflected through the guidance signs, which is conducive to the operation and control by the operator.

[0020] In an optional embodiment, the outer sheath body includes a central tube and two connecting tubes, both of which are fixedly connected to the central tube, and one end of each connecting tube penetrates the wall of the central tube; the two connecting tubes are located at the same height of the central tube and are arranged at intervals in the circumferential direction of the central tube; the two valve bodies are respectively installed on the two connecting tubes.

[0021] Based on the above scheme, the outer sheath body has a simple and reasonable structure, which is conducive to the installation of the two valves. It also makes reasonable use of the circumferential space of the central tube, providing sufficient space for the installation of the valves, thereby reducing the probability of interference between the two valves when they are in the adjustment state.

[0022] In an optional embodiment, the port of the connecting pipe away from the central pipe is provided with a Luer connector.

[0023] Based on the above solution, the Luer connector facilitates quick assembly and disassembly with pipelines and is easy to operate.

[0024] In an optional embodiment, the central tube includes an integral first tube body and a second tube body, the first tube body and the second tube body are coaxially arranged, the outer diameter of the first tube body is larger than the outer diameter of the second tube body, and both connecting tubes are fixed to the second tube body.

[0025] Based on the above solution, by setting the central tube as a stepped tube, the thickness difference of the tube wall at different positions along the central tube axis can be reduced, making it less prone to deformation during injection molding, less prone to shrinkage or cracking defects, and resulting in a high yield rate.

[0026] Secondly, this utility model provides an arthroscopic assembly, the arthroscopic assembly comprising:

[0027] The arthroscopic outer sheath assembly described in any of the foregoing embodiments.

[0028] The beneficial effects of this utility model embodiment include at least the following:

[0029] The arthroscopic outer sheath assembly provided in this embodiment features two valves mounted on the outer sheath body. These two valves are individually controlled, allowing for independent on / off control to adapt to different needs during surgery. When adjusting the valve's operating state, the valve core can be rotated relative to the valve body. The different opening areas of the valve core relative to the valve body allow for flow control. When rotating the valve core, force is applied to the first and second lever arms. Since the first lever arm is shorter than the second, this design ensures that the longer second lever arm increases the rotational force, making valve core rotation easier, while also preventing interference and collision between the two first lever arms during rotation by placing the shorter first lever arm on the inside, thus enhancing operational safety. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the arthroscopic outer sheath assembly according to an embodiment of this application;

[0032] Figure 2 This is an exploded view of the arthroscopic outer sheath assembly according to an embodiment of this application;

[0033] Figure 3 This is a cross-sectional schematic diagram of the arthroscopic outer sheath assembly according to an embodiment of this application.

[0034] icon:

[0035] 100 - Outer sheath body; 110 - Central tube; 111 - First tube body; 112 - Second tube body; 113 - Notch; 120 - Connecting tube; 130 - Luer connector; 140 - Buckle plate; 200 - Valve; 210 - Valve body; 211 - First protrusion; 2111 - First side; 2112 - Second side; 212 - Second protrusion; 2121 - Third side; 2122 - Fourth side; 220 - Valve core; 221 - Core body; 2211 - Through hole; 222 - First lever arm; 223 - Second lever arm; 224 - Third protrusion; 225 - Fourth protrusion; 226 - Indicator. 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 if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during 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, and therefore should not be construed as a limitation of this utility model.

[0040] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0041] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0042] In existing technology, two independently controllable valves 200 are installed on the outer sheath of the arthroscope. The operating state of the valves 200 can be adjusted by rotating their handles. The handles are roughly T-shaped and can rotate 360° in the circumferential direction. However, this allows for free rotation of the handles, which can lead to interference and collisions, making operation inconvenient. Furthermore, the free rotation of the handles makes it impossible to precisely control the rotation of the valves 200, resulting in over-rotation and increasing operation time.

[0043] In view of this, the designers have provided an arthroscopic sheath assembly that can reduce the probability of interference and collision between the two handles when the valve 200 is controlled, thereby improving the safety of operation.

[0044] Please refer to Figures 1-3 This embodiment provides an arthroscopic external sheath assembly, which includes an external sheath body 100 and two valves 200, wherein:

[0045] The outer sheath body 100 is provided with a flow channel; each valve 200 includes a valve body 210 and a valve core 220. The valve body 210 is installed on the outer sheath body 100, and the two valve bodies 210 are located at the same height of the outer sheath body 100 and are arranged at intervals in the circumferential direction of the outer sheath body 100; the valve body 210 is connected to the flow channel; the valve core 220 includes a connected core 221 and a handle. The core 221 is rotatably engaged with the valve body 210, and the core 221 is used to adjust the opening and closing of the valve body 210;

[0046] Each handle has a first lever arm 222 and a second lever arm 223 connected together. The first lever arm 222 and the second lever arm 223 extend in opposite directions, and the length of the first lever arm 222 is shorter than the length of the second lever arm 223.

[0047] As described above, the arthroscopic outer sheath assembly provided in this embodiment operates as follows:

[0048] During surgery, if fluid needs to be introduced into the body, one valve 200 can be closed and the other valve 200 opened. The open valve 200 is connected to the fluid source, and the fluid enters the outer sheath body 100 through the open valve 200 and then flows into the patient's body through the flow channel of the outer sheath body 100. When it is necessary to drain the fluid from the patient's body, the previously closed valve 200 is opened, and the previously open valve 200 is closed. A suction pump can be connected to the outside of the open valve 200 to suction the fluid from the body, improving efficiency. The two valves 200 are independently controllable, allowing for flexible operation. Furthermore, since the length of the first lever arm 222 of each valve 200 is shorter than the length of the second lever arm 223, the second lever arm 223 can provide greater rotational force when force is applied, making operation easier. The first lever arm 222 can be positioned inside, reducing the likelihood of interference or collision between the two first lever arms 222 during rotation, thus making the rotation operation safer.

[0049] The following embodiments illustrate the details of the arthroscopic outer sheath assembly of this application by way of example.

[0050] Please refer to Figure 1 In this embodiment, optionally, the arthroscopic outer sheath assembly includes an outer sheath body 100 and two valves 200. Both valves 200 are installed on the outer sheath body 100 and are independently controlled, capable of communicating with or blocking the outer sheath body 100 respectively.

[0051] Please refer to Figures 1-3In this embodiment, optionally, the outer sheath body 100 includes an integral central tube 110 and two connecting tubes 120. The two connecting tubes 120 are located on both sides of the central tube 110 and are symmetrically arranged, that is, the two connecting tubes 120 are located at the same height of the central tube 110. The two connecting tubes 120 are evenly spaced in the circumferential direction of the central tube 110. In other words, the two connecting tubes 120 are located on the same cross-section of the central tube 110, and the axes of the two connecting tubes 120 are coaxial and coincide with the diameter of the central tube 110. The ports of the two connecting tubes 120 are connected to the lumen of the central tube 110. The lumen of the central tube 110 and the lumen of the connecting tubes 120 form the flow channel of the outer sheath body 100.

[0052] Furthermore, the central tube 110 is configured as a stepped tube with a circular cross-sectional profile, the cross-section of which is a plane perpendicular to the axis of the central tube 110. Specifically, the central tube 110 includes a coaxial and connected first tube body 111 and a second tube body 112. The outer diameter of the first tube body 111 is larger than the outer diameter of the second tube body 112, and both connecting tubes 120 are fixed to the second tube body 112. The port of the first tube body 111 is the rear end, and the port of the second tube body 112 is the distal end. The arthroscope body or obturator is inserted into the central tube 110 from the rear end. A notch 113 is provided at the rear end of the first tube body 111, and a retaining plate 140 is installed at the notch 113. The retaining plate 140 can engage with the annular groove on the arthroscope body or obturator inserted into the central tube 110, thereby achieving axial locking. Furthermore, the width of the buckle 140 is smaller than the width of the notch 113. Thus, the buckle 140 does not completely cover the notch 113. When the arthroscope body or the obturator is inserted into the central tube 110, the situation inside the central tube 110 can be observed from the notch 113. This makes it easier to observe and judge when the product malfunctions, such as leakage or jamming.

[0053] Meanwhile, since the central tube 110 is set as a stepped tube, the lumen of the first tube section is larger than that of the second tube section, which reduces the size difference between the wall thickness of the first tube section and the wall thickness of the second tube section. In other words, it reduces the difference in wall thickness between the first tube section and the second tube section. The central tube 110 is not easy to deform during injection molding, and is not prone to shrinkage or cracking defects, resulting in a high yield rate.

[0054] It should be understood that the port of the connecting pipe 120 can be set as a Luer connector 130. The Luer connector 130 facilitates quick assembly and disassembly with the pipe and is easy to operate.

[0055] In this embodiment, optionally, the valve 200 includes a valve body 210 and a valve core 220. The valve body 210 is fixed on the connecting pipe 120, and the valve core 220 is rotatably mounted on the valve body 210.

[0056] Please refer to Figure 2Specifically, one end of the valve body 210 is closed while the other end is open, and a first limiting structure is provided at the open end of the valve body 210. The first limiting structure may be a first protrusion 211 and a second protrusion 212, which are spaced apart in the circumferential direction of the valve body 210. The first protrusion 211 has a first side 2111 and a second side 2112 in a predetermined circumferential direction, and the second protrusion 212 has a third side 2121 and a fourth side 2122 in the predetermined circumferential direction. In other words, the first side 2111, the second side 2112, the third side 2121, and the fourth side 2122 are arranged sequentially in the predetermined circumferential direction. For example, in this embodiment, using... Figure 2 As shown in the diagram for reference, the first side 2111, the second side 2112, the third side 2121 and the fourth side 2122 are arranged in a clockwise direction.

[0057] Optionally, the valve core 220 includes a connected core 221 and a handle. The core 221 is rotatably fitted with the valve body 210, and the core 221 is used to adjust the opening and closing of the valve body 210. The handle includes a connected first lever arm 222 and a second lever arm 223, the length of the first lever arm 222 being less than the length of the second lever arm 223. When the valve 200 is installed with the connecting pipe 120, the distance between the two cores 221 is L, and the sum of the lengths of the two first lever arms 222 is L1, where L ≥ L1. Thus, with the first lever arms 222 positioned on the inner side, when the handle is rotated, the two first lever arms 222 may rotate inward simultaneously, which could easily cause interference with the handle. However, since the sum of the lengths of the two first lever arms 222 is less than the distance between the cores 221, when the two first lever arms 222 rotate until they coincide with the line connecting the two cores 221, the distance between the two first lever arms 222 is minimized, and no interference or collision occurs. It should be understood that the core 221 is a rotating body with its own axis of rotation. The core 221 rotates about the axis of rotation relative to the valve body 210. The axes of rotation of the two cores 221 are parallel, and the distance between the two cores 221 refers to the distance between the two axes of rotation. The length of the first lever arm 222 refers to the length between the end of the first lever arm 222 that connects to the second lever arm 223 and the other end of the first lever arm 222. The end face of the first lever arm 222 that connects to the second lever arm 223 is located on the axis of rotation. Thus, the length of the first lever arm 222 can also be understood as the distance between the axis of rotation and the end of the first lever arm 222 that is away from the second lever arm 223.

[0058] Optionally, a second limiting structure is provided on the outer peripheral surface of the core 221. The second limiting structure includes a third protrusion 224 and a fourth protrusion 225, which are spaced apart in the circumferential direction of the core 221. The core 221 is inserted into the valve body 210. The third protrusion 224 on the core 221 is located between the first side 2111 and the fourth side 2122, and the fourth protrusion 225 is located between the second side 2112 and the third side 2121. When the core 221 rotates, it can switch between a first position and a second position. When the core 221 is in the first position, the valve core 220 closes the valve body 210. When the core 221 is in the second position, the valve core 220 opens the valve body 210, and the flow rate of the valve body 210 is at its maximum. At this time, the first lever arm 222 is located on the side of the second lever arm 223 close to the outer sheath body 100. The first lever arm 222 is basically perpendicular to the axis of the central tube 110. When both first lever arms 222 are in the second position, the two first lever arms 222 are collinear.

[0059] It should be understood that a through hole 2211 can be provided on the core 221. When the core 221 rotates to the first position, the through hole 2211 is misaligned with the valve body 210, and the circumferential surface of the core 221 closes the valve body 210, thereby blocking the valve body 210. When the core 221 rotates to the second position, the through hole 2211 communicates with the valve body 210.

[0060] Due to the design of the first and second limiting structures, during the rotation of the valve core relative to the valve body 210, when the third protrusion 224 rotates to contact the first side 2111, the fourth protrusion 225 is in contact with the third side 2121. At this time, the valve core 220 cannot continue to rotate, and this position can be set as the position where the valve body 210 is fully open. When it is necessary to adjust the state of the valve body 210, the valve core 220 can only be rotated in the opposite direction to avoid misoperation and improve operating efficiency. During this process, the third protrusion 224 moves away from the first side 2111 and moves closer to the fourth side 2122, and the fourth protrusion 225 moves away from the third side 2121 and moves closer to the second side 2112. When the third protrusion 224 contacts the fourth side 2122, the fourth protrusion 225 also contacts the second side 2112. This position is the position where the valve body 210 is closed. Please refer to... Figure 1 In this state, valve 200 is open, and when rotated 90° counterclockwise, valve 200 is closed.

[0061] Optionally, a guide mark 226 may be provided on the first lever arm 222 or the second lever arm 223. The guide mark 226 can visually reflect the working status of the valve 200, facilitating operator control. For example, the guide mark 226 may be an arrow, indicating the direction of fluid flow.

[0062] The arthroscopic sheath assembly provided in this embodiment features precise valve 200 control, making it less prone to misoperation and interference or collision, ensuring safe and reliable operation.

[0063] This embodiment also provides an arthroscopy assembly, which includes the arthroscopy sheath assembly of the above embodiment, and has at least the advantages of precise operation and safe and reliable operation.

[0064] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An arthroscopic sheath assembly comprising: The outer sheath assembly comprises an outer sheath body (100) and two valves (200), wherein: The outer sheath body (100) is provided with a flow channel; each valve (200) comprises a valve body (210) and a valve core (220), the valve body (210) is mounted on the outer sheath body (100), two valve bodies (210) are arranged at the same height of the outer sheath body (100) and are spaced apart in the circumferential direction of the outer sheath body (100); the valve body (210) communicates with the flow channel; the valve core (220) comprises a core body (221) and a handle connected with each other, the core body (221) is rotatably matched with the valve body (210), and the core body (221) is used for adjusting the opening and closing of the valve body (210). Each handle has a first force arm (222) and a second force arm (223) connected with each other, the extension directions of the first force arm (222) and the second force arm (223) are opposite, and the length of the first force arm (222) is shorter than that of the second force arm (223).

2. The arthroscopic outer sheath assembly according to claim 1, wherein: The valve core (220) has a first position and a second position which are switched with each other, when being in the first position, the valve core (220) closes the valve body (210); when being in the second position, the valve core (220) opens the valve body (210), and the first force arm (222) is located on the side of the second force arm (223) close to the outer sheath body (100).

3. The arthroscopic outer sheath assembly according to claim 2, wherein: The distance between the core bodies (221) of the two valve bodies (210) is L, the sum of the lengths of the two first force arms (222) is L1, and L≥L1.

4. The arthroscopic outer sheath assembly according to claim 2, wherein: The valve body (210) is provided with a first limiting structure, and the core body (221) is provided with a second limiting structure; when the core body (221) is in the first position or the second position, the second limiting structure is in contact with the corresponding position of the first limiting structure to limit the rotation range of the core body (221).

5. The arthroscopic outer sheath assembly according to claim 4, wherein: The first limiting structure comprises a first protrusion (211) and a second protrusion (212), the first protrusion (211) and the second protrusion (212) are arranged at intervals in the circumferential direction of the valve body (210); the first protrusion (211) has a first side (2111) and a second side (2112) in a preset circumferential direction, and the second protrusion (212) has a third side (2121) and a fourth side (2122) in the preset circumferential direction; the second limiting structure comprises a third protrusion (224) and a fourth protrusion (225), the third protrusion (224) and the fourth protrusion (225) are arranged at intervals in the circumferential direction of the core body (221); the third protrusion (224) is located between the first side (2111) and the fourth side (2122), and the fourth protrusion (225) is located between the second side (2112) and the third side (2121).

6. The arthroscopic sheath assembly according to any one of claims 1-5, characterized in that: A guide mark (226) is arranged on the first force arm (222) or the second force arm (223).

7. The arthroscopic sheath assembly according to claim 1, characterized in that: The sheath body (100) comprises a central tube (110) and two connecting tubes (120), the two connecting tubes (120) are fixedly connected with the central tube (110), and one end of each connecting tube (120) penetrates the tube wall of the central tube (110); the two connecting tubes (120) are arranged at intervals in the circumferential direction of the central tube (110) at the same height of the central tube (110); and two valve bodies (210) are installed on the two connecting tubes (120) respectively.

8. The arthroscopic sheath assembly according to claim 7, characterized in that: A luer joint (130) is arranged on the end of the connecting tube (120) away from the central tube (110).

9. The arthroscopic sheath assembly according to claim 7, characterized in that: The central tube (110) comprises an integrated first tube body (111) and a second tube body (112), the first tube body (111) and the second tube body (112) are coaxially arranged, the outer diameter of the first tube body (111) is larger than that of the second tube body (112), and the two connecting tubes (120) are fixed on the second tube body (112).

10. An arthroscopic assembly comprising: The arthroscopic assembly comprises the arthroscopic sheath assembly according to any one of claims 1-9.

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