Suction device and endoscope having the same

Abstract

This utility model relates to an aspirator and an endoscope having the same. The aspirator includes a central tube and a connecting arm. The central tube includes an aspiration tube and a connector communicating with the inner lumen of the aspiration tube. The connecting arm includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the outer periphery of the central tube and extends radially along the central tube. The second connecting portion extends from the end of the first connecting portion away from the central tube toward the distal end of the aspiration tube. The aspirator can be fixed to the endoscope body through the clamping space formed between the central tube and the connecting arm, facilitating quick installation, connection, and disassembly of the aspirator and endoscope body. After installation, the position of the aspirator relative to the axial direction of the endoscope body can be adjusted and locked by pushing the connecting arm with one hand, preventing movement of the aspirator from affecting the visualization and suction effect, improving the flexibility and precision of surgical operations, and offering convenient operation and a simple structure.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, and more specifically, to an aspirator and an endoscope having therein. Background Technology

[0002] Intracranial hematoma is a serious neurological disorder, commonly occurring as a complication of trauma, cerebral hemorrhage, or surgery. Timely diagnosis and treatment are crucial for saving lives and restoring health. Currently, there are two routine methods for treating intracranial hematoma in clinical practice: one is percutaneous drainage, which involves placing a drainage catheter into the hematoma through a puncture; the other is craniotomy for hematoma evacuation, which typically uses a suction device combined with an endoscope to achieve visualized removal of the hematoma. This method is less invasive and allows for more complete hematoma removal, and is gradually being adopted in clinical practice.

[0003] The suction device and endoscope can be used independently or in combination. When used independently for visualized aspiration, both the endoscope and the suction device need to be operated simultaneously, requiring two hands or the combined operation of two or more doctors, which is inconvenient and poses a risk of interference between the endoscope and the suction device. When used together, an instrument channel is set inside the endoscope, through which the suction device is inserted to the surgical site for aspiration. While this method improves the visualization of the aspiration, it still requires the doctor to operate with both hands simultaneously: one hand to operate the endoscope to maintain a stable field of view, and the other hand to operate the suction device. In this case, the suction device may move within the instrument channel, which not only affects the precision of the surgery but may also cause accidental injury to surrounding tissues. To avoid this, the doctor must maintain precise control of the suction device at all times, which places extremely high demands on the surgeon's skills and experience, hindering the widespread adoption of neuroendoscopic techniques.

[0004] While existing technologies have locking structures for locking the relative positions of the aspirator and endoscope, these structures require rotating to change the diameter of the inner cavity of the locking structure to lock the aspirator in place. This method requires one hand to rotate while the other hand holds the relative positions of the aspirator and endoscope in place, which is inconvenient. Furthermore, the position of the aspirator relative to the endoscope is very easy to move during the tightening process, which can easily cause accidental injury to the tissue at the tip of the aspirator. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the inconvenience of combining and adjusting the endoscope and suction device, and the need for two-handed operation. This invention provides a suction device and an endoscope incorporating it. By optimizing the structure of the suction device, the installation, connection, and disassembly of the suction device and the endoscope body can be quickly achieved. Furthermore, after the two are installed and connected, the position of the suction device relative to the axial movement of the endoscope body can be adjusted and locked by pushing the connecting arm with one hand, preventing the movement of the suction device from affecting the visual suction effect, improving the flexibility and precision of the surgical operation, and offering convenient operation with a simple structure.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a suction device, including a central tube and a connecting arm. The central tube includes a suction tube and a connector communicating with the inner cavity of the suction tube. The connector is used to connect to an external negative pressure source. The connecting arm includes a first connecting portion and a second connecting portion. The first connecting portion is connected to the outer periphery of the central tube and extends radially along the central tube. The second connecting portion extends from the end of the first connecting portion away from the central tube toward the distal end of the suction tube.

[0008] Furthermore, the inner cavity of the suction tube and the inner cavity of the connector are connected to form a tubular channel with approximately the same diameter, thereby ensuring a better suction effect; the outer diameter of the connector can be set to be larger than the outer diameter of the suction tube, and the connector can be specifically set as a pagoda connector to facilitate connection to an external negative pressure source.

[0009] This invention relates to a suction device where the distal end of the suction tube can extend to the patient's surgical site. When the connector is connected to a negative pressure source, suction operation at the distal end of the suction device can be achieved. The connecting arm includes a first connecting part and a second connecting part. The first connecting part is used to connect to the outer periphery of the central tube, and the second connecting part is used to form a clamping space between the first connecting part and the central tube. The clamping space is used to clamp the proximal part of the endoscope body. By inserting the suction tube into the endoscope body and moving the suction device until the proximal part of the endoscope body is inserted into the clamping space, the suction device and the endoscope body can be quickly installed and connected. When the suction device is moved until the endoscope body is disengaged from the clamping space, the suction tube can be completely removed from the endoscope body, thus achieving disassembly and separation of the suction device and the endoscope body. The suction device of this invention can be fixed to the endoscope body through the clamping space formed between the central tube and the connecting arm, which facilitates the installation, connection and disassembly of the suction device and the endoscope body. After the two are installed and connected, the position of the suction device relative to the axial movement of the endoscope body can be adjusted and locked by pushing the connecting arm with one hand, so as to avoid the movement of the suction device affecting the visualization and suction effect, improve the flexibility and accuracy of the surgical operation, and is easy to operate and has a simple structure.

[0010] Furthermore, the second connecting part is an elastic arm, and the distance between the second connecting part and the central axis of the central tube gradually decreases along the direction from the proximal end to the distal end of the central tube. With this configuration, the second connecting part applies a clamping force towards the central tube to the endoscope body, thereby achieving a more stable clamping effect. Even without clamping the endoscope body throughout the entire clamping space, it can still be fixed, thus enabling the suction device to be installed and connected at different positions on the endoscope body.

[0011] Furthermore, a first mating structure is provided on the side of the second connecting portion facing the central tube. The first mating structure protrudes or is recessed into the side of the second connecting portion. The first mating structure can be used to lock the relative position of the suction device and the endoscope body. The locking effect of the first mating structure, combined with the clamping effect of the connecting arm and the central tube, can improve the connection stability between the suction device and the endoscope body.

[0012] Furthermore, the first mating structure comprises multiple protrusions or recesses arranged along an axis parallel to the central tube. At least two protrusions or recesses are present, allowing the aspirator to be locked at different positions on the endoscope body. The surgeon can adjust the position of the aspirator as needed and lock its axial position relative to the endoscope body. The protrusions or recesses, as the first mating structure, are simple to manufacture. Preferably, the multiple protrusions or recesses are evenly spaced on the side of the second connecting portion facing the central tube, facilitating graded locking of the aspirator's axial position relative to the endoscope body and achieving quantifiable and precise adjustment.

[0013] Furthermore, the connecting arms are in two sets, symmetrically arranged on both sides of the central axis of the central tube to form U-shaped clamping arms. The U-shaped clamping arms facilitate a stable connection between the suction device and the endoscope body. The first mating structure can be set on one set of connecting arms or on both sets of connecting arms simultaneously.

[0014] Furthermore, the connecting arm has a hollow structure, with the inner cavities of the first connecting part and the second connecting part communicating with the inner cavity of the central tube. The side of the second connecting part facing away from the central tube has a regulating hole for adjusting the suction force, connecting its inner cavity to the outside. The regulating hole is positioned to correspond to the operator's thumb position; during use, the area of ​​the regulating hole can be adjusted by the thumb to regulate the suction force, making operation more convenient.

[0015] Furthermore, the regulating hole is a strip-shaped hole with its length parallel to the central axis of the central tube, and the area of ​​the regulating hole is greater than half the area of ​​the radial cross-section of the suction tube. The strip-shaped hole facilitates gradual adjustment of the suction force during the operation, making the suction force adjustment more accurate; the design of the regulating hole area allows for more effective control of the suction force during the operation.

[0016] This utility model also provides an endoscope, including an endoscope body and a suction device as described above. The endoscope body includes a main tube and a handle connected to the main tube. The endoscope body has a clamp channel extending from the proximal end to the distal end of the main tube and the handle. An endoscope module is provided at the distal end of the main tube. The suction tube can be inserted into the clamp channel, and the connecting arm is clamped on the proximal outer surface of the handle. The distance between the distal end of the suction tube and the distal end of the main tube can be adjusted and locked through the connecting arm.

[0017] This utility model discloses an endoscope, comprising an endoscope body and a suction device. The endoscope body includes a main tube, a handle, a clamp channel, and an endoscope module. The handle provides a gripping position for the operator, and the endoscope module enables visualization of the suction operation. The suction device includes a central component and a connecting arm, with a clamping space formed between the connecting arm and the central component. By inserting the suction tube into the clamp channel of the endoscope body and simultaneously moving the suction device until at least a portion of the proximal end of the handle is inserted into the clamping space, the suction device can be installed and connected to the endoscope body. After the two are connected, the suction tube is inserted from outside the patient's body into the surgical site through the clamp channel. The relative axial position of the suction device and the endoscope body can be adjusted and locked by pushing the connecting arm with one hand. This adjusts and locks the distance between the distal end of the suction tube and the distal end of the main tube, ensuring sufficient distance between the distal end of the suction tube extending out of the clamp channel and the distal end of the endoscope module in the main tube. This creates a sufficient object distance for clear observation of the fluid being aspirated from the distal end of the suction device, and also protects the endoscope module from liquid splashes or contamination that could affect the imaging display. Furthermore, it can accommodate the different needs of different surgeons and different stages of surgery. After the aspiration operation is completed, the proximal end of the handle is pulled out of the clamping space, and the suction tube is completely removed from the clamp channel, thus achieving the disassembly and separation of the suction device and the endoscope body.

[0018] Furthermore, a second mating structure is provided on the proximal outer surface of the handle. The second mating structure is recessed or protruding from the outer surface of the handle. The second mating structure cooperates with the first mating structure on the suction device to lock the distance between the distal end of the suction tube and the distal end of the main tube.

[0019] Furthermore, the second mating structure comprises multiple concave or convex points arranged along an axis parallel to the clamp channel. At least two concave or convex points are present, used to cooperate with the first mating structure of the aspirator to lock the aspirator at different axial positions of the endoscope body. The concave or convex points, as the second mating structure, are simple to manufacture. Preferably, the concave or convex points are evenly distributed on the proximal outer surface of the handle, corresponding to the number and position of the convex or concave points on the aspirator. This allows the surgeon to adjust the distance between the distal end of the aspirator and the distal end of the main tube in stages as needed, achieving quantifiable and precise adjustment.

[0020] Furthermore, a locking groove is formed on the proximal outer surface of the handle, and the second connecting part is slidably connected to the locking groove. The side of the second connecting part opposite to the handle is a first sliding plane, and the bottom wall of the locking groove is a second sliding plane. The sliding connection facilitates the smooth adjustment of the axial position of the suction device relative to the endoscope body, thereby stably adjusting and locking the distance between the distal end of the suction device and the distal end of the main tube.

[0021] Furthermore, a second mating structure is provided on the bottom wall of the groove. This second mating structure is recessed or protruding from the bottom wall of the groove and engages with the first mating structure on the suction device to lock the distance between the distal end of the suction tube and the distal end of the main body tube. Providing the second mating structure on the bottom wall of the groove facilitates processing and makes the engagement between the second and first mating structures more stable, thus enabling stable adjustment and locking of the relative axial position of the suction tube and the main body tube.

[0022] Furthermore, the endoscope body also includes a tapered guide, which is mounted on the proximal end of the handle with its wider end facing the proximal end of the handle. The inner cavity of the tapered guide forms the proximal end of the forceps channel. The suction device also includes a tapered positioning element coaxially disposed on the outer periphery of the suction tube. When the suction tube moves relative to the main body tube until the outer peripheral surface of the tapered positioning element abuts or fits against the inner peripheral surface of the tapered guide, radial and axial positioning of the suction tube relative to the forceps channel is achieved. The tapered guide guides the insertion of the suction tube or other instruments into the forceps channel, thereby enabling the suction device or other instruments to be accurately and quickly inserted from outside the patient into the surgical site inside the body, improving the accuracy of the surgical procedure.

[0023] Furthermore, the endoscope body also includes a clamping cannula, which, together with the conical guide, constitutes the clamping channel assembly. The clamping cannula extends through both ends of the main body tube, with its distal end located at the distal end of the main body tube. The proximal end of the clamping cannula is connected to the conical guide and communicates with the outside through the conical guide. The inner cavity of the clamping cannula communicates with the inner cavity of the conical guide to form the clamping channel.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] (1) The suction device of this utility model, by setting a connecting arm connected to the central tube, can be installed and fixed on the endoscope body through the clamping space formed between the central tube and the connecting arm, which facilitates the quick installation, connection and disassembly of the suction device and the endoscope body; and after the two are installed and connected, the position of the suction device relative to the axial movement of the endoscope body can be adjusted and locked by pushing the connecting arm with one hand, thereby adjusting and locking the distance between the distal end of the suction tube and the distal end of the main tube, avoiding the movement of the suction device from affecting the visual suction effect, improving the flexibility and accuracy of the surgical operation, and is easy to operate and simple in structure, which can meet the different needs of different surgeons and different surgical stages.

[0026] (2) The suction device of this utility model, by setting a first mating structure, cooperates with the second mating structure set on the handle of the endoscope body to lock the distance between the distal end of the suction tube and the distal end of the main tube; when the mating structure has multiple protrusions and multiple concave points, it can be adjusted and locked step by step to achieve quantifiable and precise adjustment. As the length of the distal end of the suction tube extending beyond the distal end of the main tube increases, the number of pairs of protrusions and concave points for locking gradually increases to ensure good structural stability and stable suction action. It is easy to operate and saves effort, has a simple structure, and is easy to process.

[0027] (3) The suction device of this utility model adopts a U-shaped clamping arm to stably fix at least part of the proximal end of the endoscope body handle in the clamping space formed between the central tube and the connecting arm, making the connection between the suction device and the endoscope body more stable, improving the accuracy and stability of the surgical operation, and the structure is simple.

[0028] (4) The suction device of this utility model achieves the purpose of controllable suction force by setting an adjustment hole on the connecting arm. Moreover, it can be adjusted by moving the thumb of the hand holding the endoscope during the operation. It is convenient to operate and can meet the needs of different suction forces in various surgical scenarios. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the suction device.

[0030] Figure 2 This is a schematic diagram of the connecting arm in the suction device;

[0031] Figure 3 This is a schematic diagram of the structure of the main body of the endoscope;

[0032] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0033] Figure 5 A schematic diagram of the suction device and the main body of the endoscope;

[0034] Figure 6 A three-dimensional view of an endoscope with a suction device and a pistol-shaped handle;

[0035] Figure 7 A schematic diagram of the internal structure of an endoscope with a suction device.

[0036] Figure 8 for Figure 7 A magnified view of part B in the middle;

[0037] Figure 9 A three-dimensional view of an endoscope with a suction device and a straight handle;

[0038] Figure 10 A schematic diagram of the forceps channel assembly of the endoscope body;

[0039] In the attached diagram: 100, suction device; 110, central tube; 111, suction tube; 112, connector; 120, connecting arm; 121, first connecting part; 122, second connecting part; 123, first mating structure; 124, conical positioning part; 125, first arc structure; 126, adjustment hole; 130, clamping space; 200, endoscope body; 210, main body tube; 220, handle; 221, second mating structure; 222, locking groove; 223, guide slope; 224, through hole; 225, second arc structure; 300, endoscope module; 400, forceps channel assembly; 410, forceps channel; 420, forceps tube; 430, conical guide; 431, tubular part; 432, conical part; 433, mounting truncated cone part; 500, flushing assembly. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0041] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0042] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0043] In addition, in this invention, "distal" and "proximal" refer to the distance of the suction device or endoscope from the patient during use. Specifically, the proximal end refers to the end furthest from the patient during use, while the distal end refers to the end closest to the patient or inserted into the patient's body. More specifically, the proximal ends of the central tube, suction tube, endoscope body, handle, main tube, forceps channel (or forceps tube), and insertion tube all refer to the ends furthest from the patient during surgery, while the distal ends of the central tube, suction tube, endoscope body, handle, main tube, forceps channel (or forceps tube), and insertion tube all refer to the ends closest to the patient or inserted into the patient's body during surgery.

[0044] Example 1

[0045] This embodiment is a first embodiment of the suction device 100 of this utility model, including a central tube 110 and a connecting arm 120. The central tube 110 includes a suction tube 111 and a connector 112 communicating with the inner cavity of the suction tube 111. The connector 112 is used to connect to an external negative pressure source. The connecting arm 120 includes a first connecting portion 121 and a second connecting portion 122. The first connecting portion 121 is connected to the outer periphery of the central tube 110 and extends radially along the central tube 110. The second connecting portion 122 extends from the end of the first connecting portion 121 away from the central tube 110 toward the distal end of the suction tube 111. Figure 1 , 2As shown. In this embodiment, a clamping space 130 is formed between the first connecting part 121, the second connecting part 122 and the central tube 110. The clamping space 130 is used to clamp the proximal part of the endoscope body 200. Insert the suction tube 111 into the endoscope body 200 and move the suction device 100 until a portion of the proximal structure of the endoscope body 200 is inserted into the clamping space 130. This allows for quick installation and connection of the suction device 100 and the endoscope body 200. When the suction device 100 is moved out of the clamping space 130, the suction tube 111 is completely removed from the endoscope body 200, allowing for disassembly and separation of the suction device 100 from the endoscope body 200. After the two are installed and connected, the axial position of the suction device 100 relative to the endoscope body 200 can be adjusted and locked by pushing the connecting arm 120 with one hand. This prevents the movement of the suction device 100 from affecting the visual suction effect, improves the flexibility and precision of the surgical operation, and is convenient and simple in structure.

[0046] The suction tube 111 is a thin-walled hollow tube of uniform diameter, with a central cavity providing a suction channel. The connector 112 and the connecting arm 120 can be an integral structure or fixedly connected. The proximal end of the suction tube 111 is connected to the distal end of the connector 112. In this embodiment, the inner cavity of the suction tube 111 and the inner cavity of the connector 112 are connected to form a tubular channel with approximately the same diameter to ensure a better suction effect. In order to facilitate the connection of the connector 112 to an external negative pressure source, the outer diameter of the connector 112 can be set to be larger than the outer diameter of the suction tube 111, and the connector 112 can be specifically set as a pagoda connector.

[0047] Specifically, when the connector 112 and the connecting arm 120 are an integral structure, the connector 112 and the second connecting part 122 are located on both sides of the first connecting part 121. The first connecting part 121 has a through hole that communicates with the connector 112 and allows the suction tube 111 to pass through. During installation, the proximal end of the suction tube 111 is passed through the through hole of the first connecting part 121 and inserted into the connector 112 to achieve a fixed connection between the suction tube 111 and the connector 112. When the connector 112 and the connecting arm 120 are fixedly connected, the proximal end of the suction tube 111 is inserted into the connector 112 to achieve the connection and communication between the two. The connection between the suction tube 111 and the connector 112 can be a plug-in connection; the connecting arm 120 can be connected to the proximal end of the suction tube 111 (specifically, the proximal end of the portion of the suction tube 111 extending out of the connector 112), or to the outer periphery of the connector 112, or to the outer periphery of the connection between the suction tube 111 and the connector 112, wherein connecting to the outer periphery of the connection between the suction tube 111 and the connector 112 is the preferred option.

[0048] To improve the clamping stability between the connecting arm 120 and the endoscope body 200, the second connecting portion 122 is configured as follows in this embodiment: the second connecting portion 122 is set as an elastic arm, and the distance between the second connecting portion 122 and the central axis of the central tube 110 gradually decreases along the direction from the proximal end to the distal end of the central tube 110; and the side of the second connecting portion 122 facing the central tube 110 is a planar structure to increase the contact area between the second connecting portion 122 and the outer surface of the endoscope body 200. When a portion of the structure at the proximal end of the endoscope body 200 is located within the clamping space 130, the second connecting portion 122 applies a clamping force toward the central tube 110 to the endoscope body 200, thereby achieving a more stable clamping effect. At this point, regardless of whether the proximal structure of the endoscope body 200 is clamped within a portion of the clamping space 130 or within the entire clamping space 130, the endoscope body 200 can be stably clamped within the clamping space 130. This configuration of the connecting arm 120 allows for stepless adjustment of the axial position of the suction device 100 relative to the endoscope body 200 and positioning at any clamping position, thus broadening its applicability. Furthermore, the distal outer edge of the second connecting portion 122 is a smooth first arc structure 125, which can prevent accidental injury to the operator during operation. However, this is not a limitation of the present invention; the distal end of the second connecting portion 122 may not be an arc structure.

[0049] In addition, in this embodiment, the connecting arm 120 can be configured as L-shaped or U-shaped, and the U-shaped clamping arm is the preferred embodiment. When the connecting arm 120 is configured as L-shaped, one end of the first connecting part 121 is connected to the outer periphery of the central tube 110, and the second connecting part 122 is connected to the other end of the first connecting part 121. When the connecting arm 120 is configured as U-shaped, the two sets of connecting arms 120 are symmetrically arranged on both sides of the central axis of the central tube 110 to form a U-shaped clamping arm. Specifically, the first connecting parts 121 of the two sets of connecting arms 120 are symmetrically arranged about the central axis of the central tube 110, and the second connecting parts 122 of the two sets of connecting arms 120 are parallel to the central axis of the central tube 110 and symmetrically arranged, such as... Figure 1 , 2 As shown. The two sets of connecting arms 120 can be either separate structures or integrally formed structures. In order to facilitate the processing and forming of the U-shaped clamping arms, in this embodiment, the sides of the first connecting part 121 and the second connecting part 122 are both planar structures, and the connection between the planes is smoothly transitioned.

[0050] The U-shaped clamp facilitates a stable connection between the suction device 100 and the endoscope body 200. The U-shaped clamp has a symmetrical structure; when the suction device 100 is mounted on the endoscope body 200, the central axis of the U-shaped clamp coincides with the central axis of the endoscope body 200, preventing the overall center of gravity of the product from shifting. This makes it easier for the operator to maintain the product's position and avoids accidental injury to other tissues. The two second connecting parts 122 can be configured as elastic arms. The elasticity of these arms allows the two sets of second connecting parts 122 to stably clamp onto two opposite sides of the proximal end of the endoscope body 200. The forces exerted by the two second connecting parts 122 on the two opposite sides of the proximal end of the endoscope body 200 are equal in magnitude and opposite in direction, thus stably clamping a portion of the proximal structure of the endoscope body 200 within the clamping space 130.

[0051] Example 2

[0052] This embodiment is the second embodiment of the suction device 100 of this utility model. This embodiment is similar to the first embodiment, except that a first mating structure 123 is provided on the side of the second connecting part 122 facing the central tube 110. The first mating structure 123 protrudes or is recessed into the side of the second connecting part 122. By combining the locking effect of the first mating structure 123 with the clamping effect of the clamping space 130, the relative axial position of the suction device 100 and the endoscope body 200 can be stably locked, such as... Figure 2 As shown. When there are two sets of connecting arms 120, the first mating structure 123 can be provided on the side of one of the second connecting parts 122, or it can be provided on the side of both second connecting parts 122 at the same time.

[0053] Specifically, when there is only one first mating structure 123, there is only one fixed position, which is usually the furthest point where the distal end of the suction tube 111 extends beyond the distal end of the endoscope body 200. When there are multiple first mating structures 123, there are multiple fixed positions, and the number of fixed positions is equal to the number of first mating structures 123. Generally, one of the multiple fixed positions is the furthest point where the distal end of the suction tube 111 extends beyond the distal end of the endoscope body 200. In order to improve the connection stability and locking accuracy between the connecting arm 120 and the endoscope body 200, in this embodiment, there are multiple first mating structures 123, but the number of first mating structures 123 is not a limitation of this utility model.

[0054] To facilitate the processing of the first mating structure 123, in this embodiment, the first mating structure 123 consists of multiple protrusions or concave points arranged along the axial direction parallel to the central tube 110. There are at least two protrusions or concave points, allowing the operator to adjust the axial position of the suction device 100 relative to the endoscope body 200 as needed and lock it in the desired position. When the suction device 100 is pushed forward, it moves along the axial direction of the central tube 110. When the protrusions or concave points are distributed along the length direction of the second connecting portion 122 and are parallel or substantially parallel to the axial direction of the central tube 110, one protrusion can easily slide to engage with the next concave point of the endoscope body 200, or one concave point can easily slide to engage with the next protrusion point of the endoscope body 200, making the operation simple and effortless. The protrusions and concave points are not limited to point-like structures; non-point-like protrusions and concave points that can be used to achieve locking are also within the scope of this utility model.

[0055] To achieve graded adjustment and locking of the axial position of the suction device 100 relative to the endoscope body 200, in this embodiment, the first mating structure 123 consists of multiple protrusions or recesses evenly distributed along the axis parallel to the central tube 110 on the side of the second connecting portion 122, allowing the surgeon to achieve quantifiable and precise adjustments. Specifically, the number of protrusions or recesses is three or more, such as... Figure 2 As shown. When the suction device 100 moves to a protrusion or concave point at the distal end of the second connecting part 122 to lock it in place, the distal end of the suction tube 111 extends the shortest distance beyond the distal end of the endoscope body 200, specifically flush with the distal end face of the endoscope body 200, denoted as the first position. As the suction device 100 moves distally, the distance the suction tube 111 extends beyond the distal end of the endoscope body 200 increases, and the number of protrusions or concave points that lock it in place gradually increases. The suction device 100 can be positioned relative to the endoscope body 200 in several intermediate positions. Finally, when the suction device 100 is moved to the point where all protrusions or concave points cooperate to lock it in place, the distance the distal end of the suction tube 111 extends the longest distance beyond the distal end of the endoscope body 200, denoted as the second position. In this embodiment, when the suction device 100 is moved axially between the first and second positions, at least two protrusions or two concave points simultaneously cooperate to lock it in each intermediate position, ensuring good structural stability at each intermediate position during the surgery.

[0056] Example 3

[0057] This embodiment is the third embodiment of the suction device 100 of this utility model. This embodiment is similar to the first and second embodiments, except that this embodiment can also be used to adjust the suction force.

[0058] In this embodiment, the connecting arm 120 has a hollow structure. The inner cavities of the first connecting part 121 and the second connecting part 122 are interconnected with the inner cavity of the central tube 110. The side of the second connecting part 122 facing away from the central tube 110 has a regulating hole 126 for adjusting the suction force, connecting its inner cavity to the outside. The inner cavity of the central tube 110 forms a first negative pressure channel, and the regulating hole 126, the inner cavity of the connecting arm 120, and the inner cavity of the connector 112 form a second negative pressure channel. The second negative pressure channel is used to introduce air to counteract the vacuum of the first negative pressure channel, thereby achieving the purpose of adjusting the suction force. Figure 2 As shown.

[0059] The regulating hole 126 is a strip-shaped hole whose length is parallel to the central axis of the central tube 110, facilitating gradual adjustment of the suction force during the procedure and making the suction force adjustment more accurate. The area of ​​the regulating hole 126 is larger than half the area of ​​the radial cross-section of the suction tube 111, which allows for effective adjustment of the suction force by adjusting the size of the regulating hole 126; if the area of ​​the regulating hole 126 is too small, it may lose its adjustment function.

[0060] The suction power can be adjusted by changing the area of ​​the control hole 126, making it easy to operate. When maximum suction is needed for surgery, the control hole 126 is completely covered. To reduce suction, the control hole 126 is gradually opened, connecting the first and second negative pressure channels, allowing air intake and reducing suction. To minimize suction, the control hole 126 is fully opened, connecting the first and second negative pressure channels, maximizing air intake and minimizing suction. The surgeon can adjust the suction power of the suction device 100 using the control hole 126 as needed, achieving controllable suction.

[0061] The position of the adjustment hole 126 can correspond to the position of the operator's thumb. During use, the suction force can be adjusted by changing the area of ​​the adjustment hole 126 with the thumb, making operation convenient. When there are two sets of connecting arms 120, the adjustment hole 126 can be set on either of the second connecting parts 122. Furthermore, to facilitate suction adjustment, this embodiment can provide a switch valve at the adjustment hole 126. The switch valve is slidably mounted on the connecting arm 120. During the sliding of the switch valve, the opening size of the adjustment hole 126 is adjusted, simplifying operation. However, the placement of the switch valve is not a limitation of this invention.

[0062] Example 4

[0063] This embodiment is a first embodiment of an endoscope, including an endoscope body 200 and an aspirator 100 as described in any of embodiments one to three. The endoscope body 200 includes a main tube 210 and a handle 220 connected to the main tube 210. The endoscope body 200 has a clamping channel 410 extending from the proximal end to the distal end of the main tube 210 and the handle 220. An endoscope module 300 is located at the distal end of the main tube 210. The aspiration tube 111 of the aspirator 100 can be inserted into the clamping channel 410, while a connecting arm 120 clamps the proximal outer surface of the handle 220. The distance between the distal end of the aspiration tube 111 and the distal end of the main tube 210 can be adjusted and locked via the connecting arm 120. Figures 3 to 9 As shown.

[0064] Handle 220 provides a grip position for the operator, and can be specifically a pistol-shaped handle or a flat handle, such as a pistol-shaped handle... Figures 3 to 8 As shown, the straight handle is like Figure 9 As shown, the endoscope module 300 is located at the distal end of the main tube 210, providing a visual basis for surgical operations. The suction tube 111 can move axially within the forceps channel 410, so that the distal end of the suction tube 111 extends out of the forceps channel 410 and is at a certain distance from the endoscope module 300, forming a sufficient object distance to facilitate clear observation of the suction of the distal end of the suction device 100. At the same time, it can also protect the endoscope module 300 from liquid splashing or contamination that would affect the imaging display effect. In addition, the distance between the distal end of the suction tube 111 and the distal end of the main tube 210 can be adjusted and locked by pushing the connecting arm 120 with one hand, thereby adapting to the different needs of different surgeons and different stages of surgery.

[0065] By inserting or withdrawing the suction tube 111 into the clamping channel 410 of the endoscope body 200, and simultaneously inserting or withdrawing the proximal end of the handle 220 of the endoscope body 200 into or withdrawing the clamping space formed between the connecting arm 120 and the suction tube 111, the suction device 100 and the endoscope body 200 can be quickly installed and disassembled, making the endoscope body 200 and the suction device 100 two independent modules that can be assembled and disassembled according to surgical needs. When the suction device 100 is needed, it is installed on the endoscope body 200. At this time, the suction tube 111 is inserted into the clamp channel 410 and the connecting arm 120 is clamped on the proximal outer surface of the handle 220. The suction tube 111 is inserted from outside the patient to the surgical site inside the body through the clamp channel 410. The suction tube 111 can move axially within the clamp channel 410 to achieve visual aspiration. The distance between the distal end of the suction tube 111 and the distal end of the main tube 210 can also be adjusted and locked by pushing the connecting arm 120 with one hand. When the suction device 100 is not needed, the proximal end of the handle 220 is pulled out of the clamping space formed by the connecting arm 120 and the suction tube 111, and the suction tube 111 is removed from the clamp channel 410. According to the surgical needs, instruments such as electrocoagulation devices, flushing devices, debridement devices, and catheters can be inserted into the clamp channel 410 for surgical operations such as electrocoagulation, flushing, debridement, and drug administration.

[0066] In this embodiment, the endoscope body 200 further includes a clamp channel assembly 400. The clamp channel assembly 400 includes a clamp tube 420 and a conical guide 430. The clamp tube 420 passes through both ends of the body tube 210, with its distal end located at the distal end of the body tube 210. The proximal end of the clamp tube 420 is connected to the conical guide 430 and communicates with the outside through the conical guide 430. The conical guide 430 is installed at the proximal end of the handle 220, with its wide end facing the proximal end of the handle 220. The inner cavity of the clamp tube 420 communicates with the inner cavity of the conical guide 430 to form a clamp channel passing through both ends of the endoscope body 200. Figure 10 As shown, the conical guide 430 guides the insertion of the suction device 100 or other instruments, thereby enabling the suction device 100 or other instruments to be accurately and quickly inserted from outside the patient into the surgical site inside the body, improving the accuracy of the surgical procedure.

[0067] The conical guide 430 includes a tubular portion 431, a conical portion 432, and a mounting frustum portion 433 arranged sequentially. The tubular portion 431 is connected to one end of the clamping tube 420 inside the handle 220. The conical portion 432 is located near the handle 220 and communicates with the outside. The mounting frustum portion 433 cooperates with a mounting groove inside the handle 220 to install the conical guide 430. In this embodiment, a through hole 224 can be opened near the handle 220 to install the conical guide 430 inside the handle 220, maintaining the integrity of the handle 220's exterior. However, this is not a limitation of this utility model; the conical guide 430 can also be located outside the handle 220.

[0068] Furthermore, the clamp tube 420 is a slender tubular structure, with its central axis offset from that of the main body tube 210. This allows for the simultaneous installation of the endoscope module 300 and the clamp tube 420 within the cavity of the main body tube 210, resulting in a compact endoscope. To maintain installation stability, the clamp tube 420 employs at least a two-point fixing connection. In this embodiment, the existing installation structure of the endoscope body 200 is used to install the clamp tube 420. One fixing point is located at the distal end of the main body tube 210, and the other fixing point is located at the proximal end of the main body tube 210, within the handle 220.

[0069] In this embodiment, the suction device 100 further includes a conical positioning member 124 coaxially disposed on the outer periphery of the suction tube 111. When the suction tube 111 moves relative to the main body tube 210 until the outer peripheral surface of the conical positioning member 124 abuts or fits against the inner peripheral surface of the conical guide 430, radial and axial positioning of the suction tube 111 relative to the clamp channel 410 is achieved, facilitating stable suction operation. Figure 8 As shown. In this embodiment, the conical positioning member 124 can be connected to the first connecting part 121. There is a certain gap between the wide end of the conical positioning member 124 and the first connecting part 121, or the two abut against each other. The conical positioning member 124 can also be integrally formed with the first connecting part 121, and the end face of the wide end of the conical positioning member 124 is coplanar with the side surface of the first connecting part 121. When there are two sets of connecting arms 120 in this embodiment, the wide end of the conical positioning member 124 abuts against the connection of the two first connecting parts 121. The suction tube 111 passes through the conical positioning member 124 and the first connecting part 121 and is inserted into the connector 112. The conical positioning member 124 plays a role in structural reinforcement and cooperates with the conical guide 430 to perform radial and axial positioning of the suction device 100.

[0070] The endoscope in this embodiment may further include a flushing assembly 500. The flushing assembly 500 includes an insertion end tube inserted into the main body tube 210. The distal end of the insertion end tube is located at the distal end of the main body tube 210, and the proximal end of the insertion end tube can be directly or indirectly connected to an external power water source. The flushing assembly 500 also includes a water pipe connecting pipe, a switch valve, and a Luer connector. The proximal end of the insertion end tube is installed inside the handle 220 and communicates with the water pipe connecting pipe. The portion of the water pipe connecting pipe extending outside the handle 220 is equipped with a switch valve, and the end of the water pipe connecting pipe is connected to a Luer connector. Figure 5-7 As shown. The Luer connector facilitates connection to an external power water source. The on / off valve controls the flow of water and regulates the flow rate. The water pipe connection pipe is connected to the insertion end pipe, allowing external power water to flow into the insertion end pipe for flushing. It should be noted that the flushing assembly 500 is a preferred option to enrich the endoscope's functionality by enabling simultaneous flushing and suction when the suction device 100 is installed and connected to the endoscope body 200, and is not intended to limit the scope of this invention.

[0071] Example 5

[0072] This embodiment is the second embodiment of the endoscope. This embodiment is similar to the fourth embodiment, except that: a second mating structure 221 is provided on the outer surface of the proximal end of the handle 220. The second mating structure 221 is recessed or protruding from the outer surface of the handle 220. The second mating structure 221 cooperates with the first mating structure 123 on the suction device 100 to lock the distance between the distal end of the suction tube 111 and the distal end of the main tube 210.

[0073] A second mating structure 221 is provided on the side of the handle 220 opposite to the second connecting part 122, and a first mating structure 123 is provided on the second connecting part 122 of the connecting arm 120. The first mating structure 123 and the second mating structure 221 can be one or more, such as... Figure 3 , 4 As shown. To improve the connection stability between the suction device 100 and the endoscope body 200 and to facilitate the position adjustment of the suction device 100, in this embodiment, the second connecting part 122 is an elastic arm, and / or the first mating structure 123 is an elastic protrusion. When subjected to external force, the second connecting part 122 and / or the first mating structure 123 deforms, and the suction tube 111 can move within the clamp channel 410. When the external force is removed, the first mating structure 123 and the second mating structure 221 engage and lock together.

[0074] In this embodiment, the first mating structure 123 can be specifically a protrusion, and the second mating structure 221 can be specifically a concave point. The distance between the distal end of the suction tube 111 and the distal end of the main body tube 210 is adjusted and locked by sliding the protrusion into the concave point. The positions of the protrusion and the concave point can be interchanged; that is, the first mating structure 123 is specifically a concave point, and the second mating structure 221 is specifically a concave point. In this embodiment, the first mating structure 123 is a protrusion provided on the side of the second connecting portion 122 of the suction device 100, and the second mating structure 221 is a concave point provided on the outer surface of the handle 220 near the second connecting portion 122, facilitating the processing and shaping of the handle 220 and the connecting arm 120, as well as the adjustment and locking actions. Furthermore, the first mating structure 123 can be specifically an elastic protrusion, and the second mating structure 221 can be specifically a long strip-shaped recess. When subjected to external force, the elastic protrusion slides in the long strip-shaped recess, thereby realizing stepless adjustment of the length of the distal end of the suction tube 111 extending beyond the distal end of the main body tube 210. After the external force is removed, under the elastic action of the elastic protrusion, the elastic protrusion presses against the inner wall of the long strip-shaped recess, thereby locking the distance between the distal end of the suction tube 111 and the distal end of the main body tube 210.

[0075] To achieve graded adjustment and locking of the distance between the distal end of the suction tube 111 and the distal end of the main tube 210, in this embodiment, the first mating structure 123 consists of at least one protrusion, and the second mating structure 221 consists of at least two concave points. In this embodiment, the first mating structure 123 consists of multiple protrusions evenly spaced, and the second mating structure 221 consists of multiple concave points evenly spaced. The number of protrusions and concave points are equal, both being three or more, and the spacing between each protrusion is also equal to the spacing between each concave point. Several protrusions and concave points are arranged along a direction substantially parallel to the axis of the central tube 110 and the clamp channel 410, making it easy for a protrusion to slide into the next concave point to achieve locking, which is simple and labor-saving. By using multiple protrusions and concave points evenly spaced in combination, the distance between the distal end of the suction tube 111 and the distal end of the main tube 210 can be graded and locked, achieving quantifiable and precise adjustment. The distal position of the suction tube 111 can be adjusted and locked between a first position and a second position. The first position is where the distal end of the suction tube 111 extends the shortest distance beyond the distal end of the main tube 210, and the second position is where the distal end of the suction tube 111 extends the longest distance beyond the distal end of the main tube 210. When moving the suction tube 111 between the first and second positions, different protrusions and concave points cooperate to lock the distance between the distal end of the suction tube 111 and the distal end of the main tube 210 at several intermediate positions. At each intermediate position, at least two protrusions and two concave points cooperate to lock the distance, ensuring good structural stability at each intermediate position during the surgical procedure.

[0076] A groove 222 is provided on the side of the handle 220 opposite to the second connecting part 122. The second connecting part 122 is slidably connected to the groove 222, making the sliding between the connecting arm 120 and the handle 220 smoother. A second mating structure 221 is provided on the bottom wall of the groove 222. The second mating structure 221 is recessed or protruding from the bottom wall of the groove 222 and cooperates with the first mating structure 123 on the suction device 100 to lock the distance between the distal end of the suction tube 111 and the distal end of the main body tube 210. The inner surface of the second connecting part 122 opposite to the handle 220 is the first sliding plane, and the bottom wall of the groove 222 is the second sliding plane. The first mating structure 123 is located on the first sliding plane, and the second mating structure 221 is located on the second sliding plane. This facilitates stable adjustment and locking of the distance between the distal end of the suction tube 111 and the distal end of the main body tube 210, and also facilitates the processing and forming of the first mating structure 123 and the second mating structure 221. Figure 3 , 4 As shown.

[0077] The groove 222 has a proximal opening to facilitate the second connecting part 122 sliding into it. The proximal sidewall of the groove 222 consists of two symmetrically arranged guide slopes 223 forming an acute angle with the central axis of the main tube 210. This creates a funnel-shaped opening at the proximal end of the groove 222, allowing the second connecting part 122 to slide quickly and accurately into the groove 222. Figure 4 As shown. To ensure the aesthetic appearance of the product, this embodiment can adjust the depth of the groove 222 so that when the second connecting part 122 slides into the groove 222, the outer side of the second connecting part 122 is basically flush with the outer side of the handle 220. When there are two sets of connecting arms 120, there are also two sets of grooves 222, located on opposite sides of the handle 220, with the two second connecting parts 122 sliding into the two sets of grooves 222 respectively. This arrangement makes the connection between the suction device assembly 100 and the endoscope body 200 more stable, improving the accuracy and stability of the surgical operation.

[0078] In this embodiment, the distal end of the groove 222 is a second arc structure 225. The shape of the second arc structure 225 is adapted to the first arc structure 125 of the suction device 100. When the sliding connecting arm 120 slides until the first arc structure 125 abuts or fits against the second arc structure 225, the connecting arm 120 cannot continue to push forward. The setting of the first arc structure 125 and the second arc structure 225 can also prevent the operator from being accidentally injured during operation, but this is not a limitation of this utility model.

[0079] This embodiment, through the design of the positions and dimensions of the first arc structure 125, the conical positioning member 124, the second arc structure 225, the conical part 432, the first mating structure 123, and the second mating structure 221, ensures that at the second position (i.e., the position where the distal end of the suction tube 111 extends the longest beyond the distal end of the main body tube 210), all the first mating structures 123 correspond one-to-one with all the second mating structures 221 and engage; the first arc structure 125 engages with the second arc structure 225 for limiting positioning; and the conical positioning member 124 engages with the conical part 432 for limiting positioning, as shown below. Figure 6 , Figure 8 As shown, this maintains the stability of the suction operation in the second position, while simultaneously indicating to the operator that the suction device 100 has been extended to its maximum extent, thereby ensuring the safety of the suction operation.

[0080] When visual suction is required using the suction device 100, the second connecting part 122 is slid into the groove 222 through the proximal opening of the groove 222 and slid until a protrusion at the distal end of the second connecting part 122 engages with a concave point at the proximal end of the groove 222, locking the length of the distal end of the suction tube 111 extending beyond the distal end of the main tube 210 in the first position. At this time, the distal end face of the suction tube 111 is just flush with the distal end face of the main tube 210. Then, the connecting arm 1 is gradually pushed forward. 20. The length of the distal end of the suction tube 111 extending beyond the distal end of the main tube 210 gradually increases, and the number of matching protrusions and concave points gradually increases. Finally, when the connecting arm 120 is pushed until the first arc structure 125 and the second arc structure 225 are matched and limited, and the conical positioning member 124 and the conical body part 432 are matched and limited, and each protrusion and concave point corresponds to and matches one by one, the second position is locked. At this time, the length of the distal end of the suction tube 111 extending beyond the distal end of the main tube 210 is the longest. The operator can adjust the position of the distal end of the suction tube 111 to the first position, the second position, and several intermediate positions according to the needs of use.

[0081] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0082] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model are included within the protection scope of the claims of this utility model.

Claims

1. An aspirator (100), characterized in that, The device includes a central tube (110) and a connecting arm (120). The central tube (110) includes a suction tube (111) and a connector (112) communicating with the inner cavity of the suction tube (111). The connector (112) is used to connect to an external negative pressure source. The connecting arm (120) includes a first connecting portion (121) and a second connecting portion (122). The first connecting portion (121) is connected to the outer periphery of the central tube (110) and extends radially along the central tube (110). The second connecting portion (122) extends from the end of the first connecting portion (121) away from the central tube (110) toward the distal end of the suction tube (111).

2. The suction device (100) according to claim 1, characterized in that, The second connecting part (122) is an elastic arm, and the distance between the second connecting part (122) and the central axis of the central tube (110) gradually decreases along the direction from the proximal end to the distal end of the central tube (110).

3. The suction device (100) according to claim 1, characterized in that, The second connecting part (122) is provided with a first mating structure (123) on the side facing the central tube (110), and the first mating structure (123) is provided protruding or recessed on the side of the second connecting part (122).

4. The suction device (100) according to claim 3, characterized in that, The first mating structure (123) consists of a plurality of protrusions or recesses arranged along the axial direction parallel to the central tube (110).

5. The suction device (100) according to claim 1, characterized in that, The connecting arms (120) are in two sets, and the two sets of connecting arms (120) are symmetrically arranged on both sides of the central axis of the central tube (110) to form U-shaped clamping arms.

6. The suction device (100) according to claim 1, characterized in that, The connecting arm (120) has a hollow structure. The inner cavity of the first connecting part (121) and the inner cavity of the second connecting part (122) are connected to the inner cavity of the central tube (110). The second connecting part (122) is provided with a control hole (126) on the side opposite to the central tube (110) to connect its inner cavity to the outside for adjusting the suction force.

7. The suction device (100) according to claim 6, characterized in that, The regulating hole (126) is a strip-shaped hole with its length arranged parallel to the central axis of the central tube (110), and the area of ​​the regulating hole (126) is greater than half the area of ​​the radial cross section of the suction tube (111).

8. An endoscope, characterized in that, The device includes an endoscope body (200) and an aspirator (100) as described in any one of claims 1 to 7. The endoscope body (200) includes a main tube (210) and a handle (220) connected to the main tube (210). The endoscope body (200) has a clamp channel (410) extending from the proximal end to the distal end of the main tube (210) and the handle (220). An endoscope module (300) is provided at the distal end of the main tube (210). The aspirator tube (111) can be inserted into the clamp channel (410), and the connecting arm (120) is clamped on the proximal outer surface of the handle (220). The distance between the distal end of the aspirator tube (111) and the distal end of the main tube (210) can be adjusted and locked through the connecting arm (120).

9. The endoscope according to claim 8, characterized in that, A second mating structure (221) is provided on the proximal outer surface of the handle (220). The second mating structure (221) is recessed or protruding from the outer surface of the handle (220). The second mating structure (221) cooperates with the first mating structure (123) on the suction device (100) to lock the distance between the distal end of the suction tube (111) and the distal end of the main tube (210).

10. The endoscope according to claim 9, characterized in that, The second mating structure (221) consists of a plurality of concave or convex points arranged along the axial direction parallel to the axial direction of the clamp channel (410).

11. The endoscope according to claim 8, characterized in that, A locking groove (222) is provided on the proximal outer surface of the handle (220), and the second connecting part (122) is slidably connected to the locking groove (222).

12. The endoscope according to claim 8, characterized in that, The endoscope body (200) also includes a conical guide (430), which is installed at the proximal end of the handle (220) with the wide end of the conical guide (430) facing the proximal end of the handle (220). The inner cavity of the conical guide (430) forms the proximal end of the clamp channel (410). The suction device (100) also includes a conical positioning member (124) coaxially disposed on the outer periphery of the suction tube (111). When the suction tube (111) moves relative to the main body tube (210) until the outer peripheral surface of the conical positioning member (124) abuts or fits against the inner peripheral surface of the conical guide (430), the radial and axial positioning of the suction tube (111) relative to the clamp channel (410) is achieved.

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