Locking device for a drainage catheter and drainage catheter

Abstract

The application relates to a locking device of a drainage catheter and the drainage catheter, comprising a drainage catheter base, wherein the drainage catheter base comprises a core rod which is hollowly arranged, and a locking ring which is coaxially arranged on the core rod and is sleeved on the core rod, the locking ring is provided with a small hole suitable for leading out a locking wire, and the locking ring is suitable for clamping the locking wire in cooperation with the outer wall of the core rod when rotating relative to the core rod, the application has the advantages that the locking of the locking wire can be realized by directly rotating the locking ring, the use is more convenient, the locking wire does not need to be wound for multiple turns to be locked, the operation time is reduced, and the time for subsequent operations is saved.

Description

Technical Field

[0001] This invention relates to the technical field of medical drainage catheters, and more specifically to a locking device for a drainage catheter and a drainage catheter. Background Technology

[0002] Pigtail drainage tubes are widely used clinically. They are inserted into cavities containing fluid or pus, such as the chest, abdomen, and pericardium, during surgery or guided by imaging equipment like ultrasound, X-ray, or CT scans, for drainage, irrigation, or flushing. Due to their smooth surface, clear X-ray imaging, good biocompatibility, long indwelling time, large lumen, high flow rate, and resistance to deformation and deterioration, pigtail catheters have gradually replaced the previously used single-lumen ordinary catheters.

[0003] The pigtail drainage tube has a curled end, forming a pigtail. This curling effectively prevents the tube from dislodging from the inlet and detaching from the body cavity, while also preventing tube displacement and reducing complications. A pigtail drainage tube with a locking suture allows for locking the curled end and adjusting the curvature, making it more suitable for drainage in various surgical sites. It has excellent adaptability, and because the locking suture at the end prevents dislodgement even during patient movement.

[0004] Currently available pig tail drainage tubes, such as the "pig tail drainage tube with locking line system" proposed in invention patent number CN206837223U, have one or more outwardly extending locking line fixing shafts on the locking line connector. During use, after adjusting the locking curvature of the curled end of the pig tail, the pulling end of the locking line is wound around the locking line fixing shaft. Then, a shell hinged to the outer wall of the locking line connector covers the locking line fixing shaft to prevent the locking line from being exposed. To ensure that the locking line wound on the locking line fixing shaft does not slip, the locking line needs to be wound multiple times, resulting in a longer locking time. Summary of the Invention

[0005] Therefore, the present invention aims to solve the technical problems of long locking time and inconvenient locking, thereby providing a locking device for a drainage catheter and a drainage catheter.

[0006] A locking device for a drainage catheter includes a drainage catheter seat, wherein the drainage catheter seat comprises:

[0007] The core rod is hollow and has a wire outlet on its side wall;

[0008] A locking ring is sleeved on the core rod and coaxially arranged with the core rod. The locking ring is provided with a small hole suitable for leading out the locking line. The locking ring is adapted to cooperate with the outer wall of the core rod to clamp the locking line when rotating relative to the core rod.

[0009] Furthermore, the inner wall of the locking ring is provided with a groove communicating with the small hole, and the transition between the inner wall of the groove and the inner wall of the locking ring is set as a rounded corner.

[0010] Furthermore, the outer wall of the core rod is provided with a cut-down surface passing through the outlet, the distance from the cut-down surface to the central axis of the core rod is less than the radius of the core rod, and a gap is left between the cut-down surface and the inner wall of the locking ring.

[0011] Furthermore, along the circumference of the core rod, the cut-down surface is symmetrical about the outlet.

[0012] Furthermore, the drainage catheter seat also includes a seat body, which is sleeved on the core rod and coaxially arranged with the core rod, and the locking ring is coaxially rotatably arranged on the seat body.

[0013] Furthermore, a retaining ring coaxial with the core rod is arranged annularly on the side wall of the core rod, and the two ends of the locking ring abut against the retaining ring and the seat body respectively.

[0014] Furthermore, a protrusion is provided on the side of the retaining ring facing the locking ring, and an arc-shaped groove is provided on the end of the locking ring facing the retaining ring. The arc-shaped groove is arranged around the axis of the locking ring, and the protrusion is located in the arc-shaped groove and slides in the arc-shaped groove along the length of the arc-shaped groove.

[0015] Furthermore, a stop position is provided in the arc-shaped groove, which is suitable for stopping the rotating locking ring when the protrusion stops it, so that the small hole is exactly aligned with the outlet.

[0016] Furthermore, a first stop tooth is provided on the locking ring; a second stop tooth is provided at one end of the seat body along the axial direction, which is adapted to unidirectionally block the first stop tooth along the rotation direction of the locking ring.

[0017] Furthermore, a drainage catheter, characterized in that it includes a locking device for any of the described drainage catheters, and further includes:

[0018] A drainage catheter, wherein one end of the drainage catheter connected to the drainage catheter seat is the drainage end, and the other end is shaped like a pig tail, which is a curled pig tail end. The curled pig tail end of the drainage catheter is provided with a side hole for drainage.

[0019] The technical solution of this invention has the following advantages:

[0020] 1. The present invention provides a locking device for a drainage catheter, comprising a drainage catheter seat, wherein the drainage catheter seat includes a core rod, the core rod being hollow and having an outlet on its side wall; a locking ring, sleeved on the core rod and coaxially arranged with the core rod, the locking ring having a small hole suitable for leading out a locking wire, the locking ring being adapted to clamp the locking wire with the outer wall of the core rod when rotating relative to the core rod; after one end of the locking wire is tied to the core rod, the locking wire enters the core rod from the outlet, then enters the drainage catheter, and locks the pig tail curled end of the drainage catheter at the pig tail curled end; after fixing the locking arc of the pig tail curled end, the locking wire is again inserted into the drainage catheter, then into the core rod, exits from the outlet, and then exits through the small hole on the locking ring; at this time, the locking wire needs to be adjusted from the small hole. The protruding end is fixed to secure the curled end of the pig tail. Then, the locking ring is rotated directly on the core rod, moving the small hole on the locking ring away from the outlet. Due to the misalignment between the outlet and the small hole, part of the locking wire will be located between the inner wall of the locking ring and the outer wall of the core rod. The inner wall of the locking ring and the outer wall of the core rod compress the locking wire, clamping it in place. Simultaneously, the locking wire is effectively wedged between the locking ring and the core rod, preventing the locking ring from easily rotating on the core rod, thus further locking the locking wire. Throughout the locking process, simply rotating the locking ring achieves the locking of the wire, making it more convenient to use and eliminating the need to wrap the locking wire multiple times, reducing operation time and saving time for subsequent surgeries.

[0021] 2. The locking device for the drainage catheter provided by the present invention has a groove on the inner wall of the locking ring that communicates with the small hole. The transition between the inner wall of the groove and the inner wall of the locking ring is rounded. This groove avoids the shearing force between the corner of the inner wall of the locking ring at the small hole and the side wall of the core rod at the outlet when the locking ring rotates to lock the locking line. This prevents the locking line from being sheared or worn away, thus damaging the locking line and affecting the locking effect of the drainage catheter.

[0022] 3. The locking device for the drainage catheter provided by the present invention has a cut-down surface on the outer wall of the core rod that passes through the outlet. The distance from the cut-down surface to the central axis of the core rod is less than the radius of the core rod. A gap is left between the cut-down surface and the inner wall of the locking ring. The cut-down surface can be used to accommodate the locking wire and further prevent the locking wire from being sheared between the inner wall of the locking ring and the outer wall of the core rod.

[0023] 4. The locking device for the drainage catheter provided by the present invention includes a protrusion on the side of the retaining ring facing the locking ring, and an arc-shaped groove on the end of the locking ring facing the retaining ring. The arc-shaped groove is arranged around the axis of the locking ring, and the protrusion is located in the arc-shaped groove and slides in the arc-shaped groove along the length of the arc-shaped groove. By setting the protrusion, when the locking ring slides on the core rod, the protrusion slides in the arc-shaped groove, which restricts the rotation direction of the locking ring and guides the rotation of the locking ring, so that the locking ring can only rotate around the axis of the core rod.

[0024] 5. The locking device for the drainage catheter provided by the present invention includes a stop position in the arc-shaped groove, which is suitable for the convex block to stop the rotating locking ring. When the convex block stops the rotating locking ring, the small hole is exactly aligned with the outlet. When the locking wire rotates on the core rod, when the convex block moves to the stop position, the convex block and the stop position in the arc-shaped groove abut against each other. Under the action of the convex block, the locking ring can no longer continue to rotate on the core rod in the same direction. At this time, the small hole of the locking ring that cannot rotate is exactly aligned with the outlet. The small hole and the outlet are coaxial, so that the small hole and the outlet can be accurately positioned, which facilitates the locking wire in the small hole to pass out from the outlet.

[0025] 6. The locking device for the drainage catheter provided by the present invention includes a first stop tooth on the locking ring and a second stop tooth on one end of the seat body along the axial direction, which is adapted to unidirectionally block the first stop tooth along the rotation direction of the locking ring. When the small hole and the outlet are aligned, the locking wire locks the pig tail curled end of the drainage catheter. After fixing the locking arc of the pig tail curled end, the locking wire is reinserted into the drainage catheter and into the core rod, passing out from the outlet. After passing out from the small hole on the locking ring, the locking ring rotates in the direction where the second stop tooth does not block the first stop tooth until the locking wire is locked by the action of the inner wall of the locking ring and the outer wall of the core rod. At this time, the second stop tooth blocks the first stop tooth, thereby preventing the locking ring from returning to its original position and causing the locking wire to no longer lock. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the drainage catheter of the present invention;

[0028] Figure 2 This is a schematic diagram of the core rod in this invention;

[0029] Figure 3This is a schematic diagram of the assembly of the locking ring and the seat in this invention;

[0030] Figure 4 This is a schematic diagram of the assembly of the base and the core rod in this invention;

[0031] Figure 5 This is a schematic diagram of the locking ring in this invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Drainage tube; 2. Drainage tube seat; 21. Core rod; 22. Locking ring; 23. Seat body; 3. Small hole; 4. Outlet; 5. Sealing gasket; 6. Groove; 7. Cut-down surface; 8. Locking mark; 9. Retaining ring; 10. Protrusion; 11. Arc groove; 12. First retaining tooth; 13. Second retaining tooth; 14. Moving groove; 15. Receiving groove; 16. Locking line. Detailed Implementation

[0034] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Example

[0039] Reference Figures 1-5 As shown, the present invention provides a drainage catheter 1, including a locking device for the drainage catheter 1, and the drainage catheter 1. One end of the drainage catheter 1 connected to the drainage catheter seat 2 is a drainage end, and the other end is shaped like a pig tail, which is a pig tail curled end. The pig tail curled end of the drainage catheter 1 is provided with a side hole for drainage.

[0040] The locking device of the drainage conduit 1 includes a drainage conduit seat 2, which includes a core rod 21 and a locking ring 22. The core rod 21 is hollow and has an outlet 4 on its side wall. The outlet 4 is connected to the interior of the core rod 21, and the locking wire 16 enters the interior of the core rod 21 from the outlet 4. The locking ring 22 is sleeved on the outer wall of the core rod 21 and is coaxial with the core rod 21. The locking ring 22 is hollow and has openings at both ends. The outer wall of the locking ring 22 has a small hole 3 suitable for leading out the locking wire 16. The locking ring 22 is adapted to clamp the locking wire 16 with the outer wall of the core rod 21 when it rotates relative to the core rod 21.

[0041] After one end of the locking wire 16 is tied to the core rod 21, the locking wire 16 enters the core rod 21 from the outlet 4, and then enters the drainage conduit 1. The curled end of the pig tail is locked onto the drainage conduit 1. After fixing the locking arc of the curled end, the locking wire 16 is reinserted into the drainage conduit 1 and then into the core rod 21, exiting from the outlet 4 and then through the small hole 3 on the locking ring 22. At this point, the end of the locking wire 16 exiting through the small hole 3 needs to be fixed to secure the curled end of the pig tail. The locking ring 22 is then rotated directly on the core rod 21 to move the small hole 3 away from the outlet 4. Because the outlet 4 and the small hole 3 produce... The misalignment causes part of the locking wire 16 to be located between the inner wall of the locking ring 22 and the outer wall of the core rod 21. Under the action of the inner wall of the locking ring 22 and the outer wall of the core rod 21, the locking wire 16 is squeezed, thereby clamping the locking wire 16. At the same time, the locking wire 16 is also essentially stuck between the locking ring 22 and the core rod 21, thus preventing the locking ring 22 from easily rotating on the core rod 21, thereby further locking the locking wire 16. In the entire locking process, the locking wire 16 can be locked by simply rotating the locking ring 22, which is more convenient to use and eliminates the need to wrap the locking wire 16 multiple times for locking, reducing operation time and saving time for subsequent surgery.

[0042] Additionally, a sealing gasket 5 is provided at the outlet 4 to seal the outlet 4. The locking wire 16 passes through the sealing gasket 5 and enters the small hole 3. The sealing gasket 5 is placed inside the outlet 4 to block the outlet 4, preventing the liquid in the drainage channel from overflowing from the through hole. At the same time, it can also block external air from entering the drainage channel to prevent secondary infection.

[0043] Specifically, the inner wall of the locking ring 22 is provided with a groove 6 that communicates with the small hole 3. The transition between the inner wall of the groove 6 and the inner wall of the locking ring 22 is rounded. When the small hole 3 and the outlet 4 correspond, the groove 6 and the outlet 4 are connected, which facilitates the locking wire 16 to enter the small hole 3 from the groove 6. The groove 6 avoids the shearing force between the inner wall of the locking ring 22 at the small hole 3 and the side wall of the core rod 21 at the outlet 4 when the locking ring 22 rotates to lock the locking wire 16, which would shear or wear down the locking wire 16 and affect the locking effect of the drainage tube 1.

[0044] As an alternative implementation, the outer wall of the core rod 21 is provided with a truncated surface 7 passing through the outlet 4. Along the circumference of the core rod 21, the truncated surface 7 is symmetrical about the outlet 4. The distance from the truncated surface 7 to the central axis of the core rod 21 is less than the radius of the core rod 21. A gap is left between the truncated surface 7 and the inner wall of the locking ring 22. That is, when the locking ring 22 rotates to the position where the small hole 3 corresponds to the outlet 4, there is a gap between the inner wall of the locking ring 22 at the small hole 3 and the truncated surface 7 at the outlet 4. The truncated surface 7 can be used to accommodate the locking wire 16, and at the same time further prevent the locking wire 16 from being sheared between the inner wall of the locking ring 22 and the outer wall of the core rod 21.

[0045] In addition, the drainage catheter seat 2 also includes a seat body 23, which is sleeved on the core rod 21 and coaxially arranged with the core rod 21. The locking ring 22 is coaxially rotatably arranged on the seat body 23. Both the seat body 23 and the locking ring 22 are provided with locking marks 8. When the small hole 3 on the locking ring 22 corresponds to the outlet 4, the two locking marks 8 are misaligned, indicating the passage of the locking line 16. When the locking ring 22 rotates to lock the locking line 16, the two locking marks 8 are close together and correspond to each other.

[0046] As a specific implementation of this embodiment, a retaining ring 9 coaxial with the core rod 21 is arranged annularly on the side wall of the core rod 21. The retaining ring 9 is detachably mounted on the core rod 21. The two ends of the locking ring 22 in the axial direction respectively abut against the retaining ring 9 and the seat 23, thereby limiting the locking ring 22 by the retaining ring 9, restricting the locking ring 22 between the seat 23 and the retaining ring 9, and preventing the locking ring 22 from moving along the length direction of the core rod 21, so that the small hole 3 and the wire outlet 4 cannot correspond, and the locking wire 16 cannot be passed out for locking.

[0047] Additionally, a protrusion 10 is provided on the side of the retaining ring 9 facing the locking ring 22, and an arc-shaped groove 11 is provided on the end of the locking ring 22 facing the retaining ring 9. The arc-shaped groove 11 is arranged around the axis of the locking ring 22, and the protrusion 10 is located in the arc-shaped groove 11 and slides in the arc-shaped groove 11 along its length. By setting the protrusion 10, when the locking ring 22 slides on the core rod 21, the protrusion 10 slides in the arc-shaped groove 11, which restricts the rotation direction of the locking ring 22 and guides the rotation of the locking ring 22, so that the locking ring 22 can only rotate around the axis of the core rod 21. When the locking ring 22 rotates to the point that the protrusion 10 and one side wall of the arc-shaped groove 11 abut against each other in the length direction, the locking ring 22 can no longer rotate. At this time, the small hole 3 and the wire outlet 4 are connected, thereby positioning the locking ring 22.

[0048] The arc-shaped groove 11 is provided with a stop position, which is suitable for the protrusion 10 to stop the rotating locking ring 22. The small hole 3 is exactly aligned with the outlet 4. The stop position is set on one side wall in the length direction of the arc-shaped groove 11. When the locking wire rotates on the core rod 21, when the protrusion 10 moves to the stop position, the protrusion 10 and the stop position in the arc-shaped groove 11 abut against each other. Under the action of the protrusion 10, the locking ring 22 can no longer continue to rotate on the core rod 21 in the same direction. At this time, the small hole 3 of the locking ring 22, which cannot rotate, is exactly aligned with the outlet 4. The small hole 3 and the outlet 4 are coaxial, so that the small hole 3 and the outlet 4 can be accurately positioned, which makes it convenient for the locking wire 16 in the small hole 3 to pass out from the outlet 4.

[0049] As an improved implementation, a first stop tooth 12 is provided on the locking ring 22; a second stop tooth 13 is provided at one end of the seat body 23 along the axial direction, adapted to unidirectionally block the first stop tooth 12 along the rotation direction of the locking ring 22. The second stop tooth 13 and the first stop tooth 12 are adapted to each other. When the small hole 3 and the cable outlet 4 correspond, the side wall of the rearmost end of the first stop tooth 12 and the side wall of the second stop tooth 13 abut against each other along the forward direction. The side wall of the first stop tooth 12 facing the second stop tooth 13 is inclined away from the wall that abuts with the second stop tooth 13 from the direction away from the core rod 21. The side wall of the second stop tooth 13 facing away from the core rod 21 is inclined away from the wall that abuts with the first stop tooth 12 from the direction away from the core rod 21. Once the small hole 3 and the outlet 4 are aligned, the locking wire 16 locks the curled end of the pig tail on the drainage conduit 1. After fixing the locking arc of the curled end of the pig tail, the locking wire 16 is reinserted into the drainage conduit 1 and into the core rod 21, passing out from the outlet 4 and then through the small hole 3 on the locking ring 22. At this time, the locking ring 22 rotates in the direction where the second stop tooth 13 does not block the first stop tooth 12, until the locking wire 16 is locked by the action of the inner wall of the locking ring 22 and the outer wall of the core rod 21. At this time, the second stop tooth 13 and the first stop tooth 12 disengage, and the second stop tooth 13 blocks the first stop tooth 12, thereby preventing the locking ring 22 from returning to its original position and causing the locking wire 16 to no longer lock.

[0050] Additionally, a movable groove 14 is provided on the side wall of the base 23. The movable groove 14 passes through the base 23 on the side facing the core rod 21 and on the side facing the second stop tooth 13. At the same time, a receiving groove 15 is provided on the outer wall of the core rod 21 at the position of the base 23 with the second stop tooth 13. The core rod 21 is made of elastic material. At this time, when the first stop tooth 12 moves with the locking ring 22, the first stop tooth 12 will push the second stop tooth 13 to move towards the receiving groove 15, so that the first stop tooth 12 can move forward again with the locking ring 22. When the locking line 16 is locked... At this time, the first stop tooth 12 and the second stop tooth 13 disengage. The second stop tooth 13 returns to its initial state under the action of elasticity. At this time, the second stop tooth 13 restricts the first stop tooth 12 from moving back, thereby locking the locking line 16. At the same time, when it is necessary to move the locking line 16 again, the side wall of the seat 23 with the second stop tooth 13 is pressed manually, thereby moving the second stop tooth 13 towards the receiving groove 15 until the second stop tooth 13 no longer obstructs the first stop tooth 12. Then, the locking ring 22 is moved to move the first stop tooth 12 to the initial position so that the small hole 3 and the cable outlet 4 correspond.

[0051] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A locking device for a drainage catheter, comprising a drainage catheter seat (2), characterized in that, The drainage catheter seat (2) mentioned above includes: Core rod (21), the core rod (21) is hollow, and the core rod (21) has a wire outlet (4) on its side wall. A locking ring (22) is sleeved on the core rod (21) and coaxially arranged with the core rod (21). The locking ring (22) is provided with a small hole (3) suitable for leading out the locking line (16). The locking ring (22) is adapted to cooperate with the outer wall of the core rod (21) to clamp the locking line (16) when rotating relative to the core rod (21). The inner wall of the locking ring (22) is provided with a groove (6) that communicates with the small hole (3), and the transition between the inner wall of the groove (6) and the inner wall of the locking ring (22) is set as a rounded corner; The outer wall of the core rod (21) is provided with a cut-down surface (7) passing through the outlet (4). The distance from the cut-down surface (7) to the central axis of the core rod (21) is less than the radius of the core rod (21). A gap is left between the cut-down surface (7) and the inner wall of the locking ring (22). Along the circumferential direction of the core rod (21), the cut surface (7) is symmetrical about the outlet (4); The drainage catheter seat (2) also includes a seat body (23), which is sleeved on the core rod (21) and coaxially arranged with the core rod (21). The locking ring (22) is coaxially rotatably arranged on the seat body (23). The locking ring (22) is provided with a first stop tooth (12); the seat (23) is provided with a second stop tooth (13) at one end in the axial direction, which is suitable for blocking the first stop tooth (12) in one direction along the rotation direction of the locking ring (22).

2. The locking device for the drainage catheter according to claim 1, characterized in that, The core rod (21) has a retaining ring (9) arranged in a ring on its side wall, which is coaxial with the core rod (21). The two ends of the locking ring (22) abut against the retaining ring (9) and the seat (23) respectively.

3. The locking device for the drainage catheter according to claim 2, characterized in that, The retaining ring (9) has a protrusion (10) on the side facing the locking ring (22). The locking ring (22) has an arc groove (11) on the end facing the retaining ring (9). The arc groove (11) is arranged around the axis of the locking ring (22). The protrusion (10) is located in the arc groove (11) and slides in the arc groove (11) along the length direction of the arc groove (11).

4. The locking device for the drainage catheter according to claim 3, characterized in that, The arc groove (11) is provided with a stop position, which is suitable for the small hole (3) to be aligned with the outlet (4) when the protrusion (10) stops the rotating locking ring (22).

5. A drainage catheter, characterized in that, The locking device for the drainage catheter according to any one of claims 1-4 further includes: The drainage tube (1) is connected to the drainage tube seat (2). One end of the drainage tube (1) is the drainage end, and the other end is shaped like a pig tail, which is the curled end of the pig tail. The curled end of the pig tail of the drainage tube (1) has a side hole for drainage.

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