Seroperitoneum drainage device

Abstract

The utility model relates to a seroperitoneum drainage device which comprises a cover body assembly and a drainage tube capable of being inserted into the cover body assembly, the cover body assembly comprises a base plate and two caps connected to the upper surface of the base plate in a sliding mode, the two caps can be attached to each other, and notches are formed in the attached end faces of the two caps in an inward concave mode. After the two caps are attached, the notches are spliced into a complete through hole for a drainage tube to penetrate through, the lower surface of the base plate is connected with a transition cylinder, the far end of the transition cylinder is connected with a drainage base, and the transition cylinder and the drainage base are each provided with a hollow cavity so that a drainage cavity allowing the drainage tube to penetrate through can be formed. The far-end opening of the drainage base is provided with a sleeving head of a circular truncated cone structure which is gradually shrunk towards the near end along the axis of the drainage base, and the top opening of the sleeving head is smaller than the bottom opening, so that the drainage tube can be connected to the side wall of the sleeving head in a sleeving mode in the mode that the far-end opening part expands.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a drainage device for ascites. Background Technology

[0002] Massive ascites is a common complication of decompensated cirrhosis. To understand the nature of the ascites, relieve abdominal distension and pain, and quickly and safely eliminate ascites, it is often necessary to insert an abdominal drainage tube to drain the ascites intermittently.

[0003] However, a common complication of abdominal drainage tube placement is ascites extravasation, which increases the risk of abdominal infection, contaminates the patient's clothing and bedding, causes inconvenience, and may lead to poor healing due to irritation and damage to the skin tissue around the puncture site caused by the extravasation. Currently, there is no effective clinical solution for this; the only way to reduce these adverse reactions is to increase the frequency of wound cleaning, but the effect is limited. For wounds without extravasation, dressings are changed every 3-5 days on average; for wounds with significant extravasation, dressings need to be changed 2-3 times a day, or even more. In severe cases, the abdominal drainage tube needs to be removed, which will affect subsequent treatment. Frequent dressing changes not only significantly increase the workload of medical staff but also increase the patient's medical expenses. A common cause of extravasation of ascites after placement of an abdominal drainage tube is the large amount of fluid in the abdominal cavity leading to high intra-abdominal pressure, and the abdominal wall becoming loose after drainage, failing to tightly wrap the drainage tube, causing the ascites to leak out along the tube.

[0004] Previously, drainage tubes all had uniform lumens. When inserting the drainage tube into the abdominal cavity, the skin tissue needs to be expanded using a skin retractor. The retractor is generally 2 Fr larger than the drainage tube (e.g., for a 6 Fr drainage tube, the retractor is 8 Fr) to facilitate smooth insertion. However, this may also result in a larger puncture site in the expanded skin, preventing the skin from properly encasing the drainage tube and leading to extravasation of ascites. This condition worsens as the ascites drains. With further drainage, the abdominal wall tissue becomes more relaxed, making it even more difficult to tightly encase the drainage tube, exacerbating the extravasation.

[0005] CN221431709U discloses a fixation dressing for abdominal drainage and an abdominal drainage device, including a fixation dressing body with a U-shaped sleeve on the fixation dressing body for connecting a drainage tube, and further including: a limiting mechanism fixedly connected to the back of the fixation dressing body; and an adsorption component connected within the limiting mechanism, the adsorption component abutting against the back of the fixation dressing body.

[0006] The drainage device in this patent uses a limiting mechanism to restrict the drainage tube, preventing it from moving within the abdominal cavity. It also uses an adsorption component to absorb any leakage between the drainage tube and its insertion hole, preventing the adhesive dressing from failing to adhere to the patient's abdomen and achieving absorption of leaked fluid. However, this device has a split structure, making operation cumbersome and prone to component loss during abdominal drainage.

[0007] Furthermore, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making this utility model, but due to space limitations, not all details and contents were listed in detail. However, this does not mean that this utility model does not have the features of these prior art. On the contrary, this utility model has all the features of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Utility Model Content

[0008] In view of the shortcomings of the prior art, this application proposes an ascites drainage device, which aims to solve one or more technical problems in the prior art.

[0009] Therefore, this utility model addresses the aforementioned technical problems by proposing an ascites drainage device, which includes a cover assembly and a drainage tube that can be inserted into the cover assembly. The cover assembly includes a pad and two caps slidably connected to the upper surface of the pad. The two caps can fit together, and the end faces of the two caps that fit together are both recessed inward to form a notch for the drainage tube to pass through. The lower surface of the pad is connected to a transition cylinder and a drainage seat, both of which have a drainage cavity that allows the drainage tube to pass through. The distal opening of the drainage seat is equipped with a sleeve with a frustum structure that tapers towards the proximal end along the axis of the drainage seat. The top opening of the sleeve is smaller than the bottom opening, so that the drainage tube can be fitted onto the side wall of the sleeve with the distal opening portion expanded.

[0010] The cap assembly design, through a pad and two slidingly connected caps, achieves flexible encapsulation and protection of the drainage tube. The cap design not only ensures stable positioning of the drainage tube within the device but also allows for convenient insertion or removal of the tube when necessary without complete disassembly of the cap assembly, thus simplifying the operation and reducing the risk of contamination from frequent disassembly. The transition cylinder and drainage seat connected to the lower surface of the pad together form a continuous drainage cavity, providing a smooth channel for the drainage tube. The tapered design of the sleeve at the distal opening of the drainage seat also has a self-locking function. When the drainage tube is inserted into the sleeve, due to the pressure of the side walls, the distal opening of the drainage tube will naturally expand and fit tightly against the inner wall of the sleeve, forming a stable connection. The drainage device of this application effectively prevents leakage during the drainage process, ensuring accurate and efficient drainage of peritoneal effusion to the patient's body.

[0011] According to a preferred embodiment, the surface of the pad is provided with a plurality of grooves to define the sliding direction of the two caps respectively. An elastic element is disposed inside the groove, and the elastic element is connected to a slider disposed on the bottom surface of the cap, so that the two caps can remain in contact with each other under the action of the elastic element when no external force is applied. The elastic element inside the groove is connected to the slider disposed on the bottom surface of the cap. When the two caps are in an unloaded state, the elastic force of the elastic element pushes the slider to slide along the groove until the contacting end faces of the two caps are in close contact. This design not only simplifies the cap closing operation, allowing medical personnel to achieve automatic cap fitting without applying additional force, but also improves the reliability and durability of the device.

[0012] According to a preferred embodiment, the outer diameter of the transition tube is smaller than the diameter of the upper surface of the drainage seat, and the edge of the upper surface of the drainage seat is chamfered to create a recessed space between the pad and the upper surface of the drainage seat for accommodating the skin. The outer diameter of the transition tube is designed to be smaller than the diameter of the upper surface of the drainage seat. This design allows a natural recessed space to be created between the pad and the upper surface of the drainage seat, providing a comfortable fit for the skin and reducing direct pressure from the drainage device on the patient's skin, thereby improving patient comfort. Furthermore, the chamfered edge of the upper surface of the drainage seat not only enhances the smoothness of the drainage seat's edge, reducing the risk of scratches or abrasions to the skin, but also further expands the range of the recessed space. The chamfered structure allows the skin to transition more smoothly to the surface of the drainage seat during application, reducing friction and pressure on the skin and further enhancing the patient's experience.

[0013] According to a preferred embodiment, the lower surface of the pad that contacts the skin is provided with an anti-slip texture, and the height of the transition tube is configured to adapt to the skin thickness to improve the stability of the device placed on the skin. The anti-slip texture ensures a firm fit of the device on the skin, improving operational stability and accuracy, thereby reducing the risk of potential device displacement. Furthermore, the height of the transition tube is configured to adapt to the skin thickness. This design allows the transition tube to fit snugly against the skin surface, avoiding discomfort to the patient due to being too high, or pressure on the skin due to being too low.

[0014] According to a preferred embodiment, multiple protrusions are spaced apart on the circumferential sidewall of the cap's notch. When two caps are in contact with each other, the protrusions abut against the wall of the drainage tube. The protrusion design enhances the friction between the cap and the drainage tube, achieving stable clamping and fixation of the drainage tube, preventing the drainage tube from shaking or shifting inside the device. Furthermore, the protrusions also have a certain elastic buffering effect. When the drainage tube is subjected to external impact or vibration, the protrusions can absorb some energy, reducing direct collision and friction between the drainage tube and the cap, thereby protecting the drainage tube from damage.

[0015] According to a preferred embodiment, the contact surfaces of the protrusions against the drainage tube wall are adapted to the curvature of the tube wall. When the two caps are in contact with each other, the diameter of the virtual circle formed by the contact surfaces of all the protrusions is smaller than the outer diameter of the drainage tube. Since the protrusions are spaced apart, and the diameter of the virtual circle formed by their contact surfaces is smaller than the outer diameter of the drainage tube, this means that the protrusions apply uniformly distributed pressure to the tube wall when clamping the drainage tube. This uniformly distributed pressure helps avoid localized excessive compression, thereby protecting the drainage tube from damage. Simultaneously, it ensures that the drainage tube maintains its original shape and performance during the fixing process.

[0016] According to a preferred embodiment, the device includes a patch portion that can be adhered to the skin. The patch portion includes a first patch and a second patch arranged in pairs, configured to overlap radially on both sides of the cap and at least partially cover the upper surface of the pad. Through the overlapping and covering design of the patch portion, the device can be effectively secured to a target area on the patient's abdomen. The patch portion adheres to the skin, forming a protective layer that reduces adverse irritation and damage to the skin from the external environment, making it suitable for occasions requiring prolonged wear or use.

[0017] According to a preferred embodiment, at least two Velcro straps are fixedly connected to the upper surface of the first dressing, and the surface of the second dressing is provided with a textured surface for adhesion to the Velcro straps. The two Velcro straps of the first dressing are adhered to the second dressing surface in a manner that places them on opposite radial sides of the drainage tube. Through the adhesion of the Velcro straps to the textured surface, the first and second dressings can be tightly connected together to form a stable fixing structure. This structure can effectively fix the drainage tube, keeping it in the correct position and ensuring the smooth progress of the drainage process. The use of Velcro straps makes the fixing method of the dressing more flexible, and can be adjusted according to the specific position and needs of the drainage tube. In addition, the reusability of the Velcro straps also makes it convenient for patients to change the dressing or adjust the fixing position of the drainage tube as needed during use.

[0018] According to a preferred embodiment, the first and second patches are configured in a layered structure, wherein the layer closest to the skin is a release layer, and a breathable layer with multiple vents is disposed above the release layer. The release layer, as the layer in direct contact with the skin, can be made of medical materials that are less likely to cause allergies, such as silicone paper, release paper / film, etc., which can effectively prevent the adhesive layer (if present) from directly adhering to the skin, reducing irritation and damage to the skin caused by application or removal. The multiple vents in the breathable layer create good gas exchange channels between the patch and the skin, helping the skin maintain normal respiratory function and reducing stuffiness and discomfort caused by prolonged application.

[0019] According to a preferred embodiment, a mesh-like structural layer is disposed above the breathable layer, and an adhesive layer is disposed above the structural layer. Hook and loop fasteners are attached to the adhesive layer of the first patch, and the adhesive layer of the second patch is configured with a textured surface that mates with the hook and loop fasteners. The mesh-like structural layer not only provides additional support but also ensures the stability of the patch during use, preventing it from easily deforming or shifting due to external forces. Furthermore, due to the combination of the hook and loop fasteners and the textured surface, the first and second patches can be reused to a certain extent, reducing usage costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the cover assembly of the drainage device of this utility model;

[0021] Figure 2 This is an anatomical diagram of one of the caps and pads of the drainage device of this utility model;

[0022] Figure 3 This is an anatomical diagram of another cap and pad of the drainage device of this utility model;

[0023] Figure 4 This is a structural schematic diagram of the cover assembly of the drainage device of this utility model from a bottom view angle;

[0024] Figure 5 This is a perspective view of the cover assembly of the drainage device of this utility model after the drainage tube is installed;

[0025] Figure 6 This is a schematic diagram of the structure of the cover assembly of the drainage device of this utility model with a pair of dressings installed;

[0026] Figure 7 This is a schematic diagram of the structure of the cover assembly of the drainage device of this utility model with two pairs of dressings installed;

[0027] Figure 8 This is a top view structural diagram of the cover assembly of the drainage device of this utility model with two pairs of dressings installed.

[0028] Figure 9 This is a schematic diagram of the layered structure of the dressing part of the drainage device of this utility model.

[0029] List of reference numerals

[0030] 100: Drainage tube; 200: Cover assembly; 210: Cap; 211: Notch; 212: Protrusion; 213: Slider; 220: Pad; 221: Slide groove; 222: Elastic element; 230: Transition cylinder; 240: Drainage seat; 241: Connector; 250: Drainage cavity; 300: Adhesive part; 310: First adhesive layer; 320: Second adhesive layer; 330: Release layer; 340: Breathable layer; 350: Structural layer; 360: Adhesive layer; 370: Velcro. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings.

[0032] Orientation definition: The end of the drainage device closer to the operator is the proximal end, and the end farther from the operator is the distal end.

[0033] This utility model relates to a drainage device for ascites, such as... Figure 5 As shown, the device includes a cover assembly 200 and a drainage tube 100, wherein the cover assembly 200 can penetrate the surface of the patient's abdominal skin to establish a channel for the drainage tube 100 to pass through, connecting the internal and external environments of the abdominal cavity.

[0034] Preferably, such as Figure 4 As shown, the cover assembly 200 further includes a cap 210, a pad 220, a transition tube 230, and a drainage seat 240. The cap 210 is designed as a pair of opposing semi-circular structures that can be spliced ​​into a complete ring. When the two are tightly fitted together, the diameter of the resulting ring is smaller than the diameter of the pad 220. The pad 220 itself is a thin circular sheet, ensuring that the cap 210 can be securely placed on the pad 220. The bottom of the pad 220 is connected to the transition tube 230, which is a hollow cylindrical structure. Its inner diameter matches the inner diameter of the hollow channel of the ring formed by the cap 210 assembly, ensuring smooth drainage and sealing. The distal end of the transition tube 230 is connected to the drainage seat 240, which has a frustum-shaped structure with an upper surface area larger than a lower surface area. The gradually expanding shape of the frustum-shaped structure facilitates the drainage seat 240's smooth passage through tissue spaces, reducing pressure and damage to the surrounding abdominal skin tissues. The pad 220 is designed to fit snugly against the patient's skin surface, leaving the cap 210 partially exposed for easy positioning and manipulation by healthcare personnel, while the drainage seat 240 extends into the patient's body to ensure effective drainage. The lower surface of the pad 220 that contacts the skin is textured for a non-slip grip. More preferably, as... Figure 4 , Figure 5 As shown, the diameter of the transition tube 230 is set to be smaller than the outer diameter of the annulus formed by the combination of the two caps 210, and also smaller than the diameter of the top surface of the drainage seat 240. This design ensures that the transition tube 230 can form an inwardly concave area inside the cap assembly 200, thereby effectively preventing the silicone cap assembly 200 from compressing the skin around the drainage port during prolonged use, thus avoiding the risk of tissue damage. In addition, the height of the transition tube 230 has been further optimized to match the thickness of the patient's skin for better fit and comfort.

[0035] Preferably, such as Figures 1-3 As shown, the cap 210 assembly is connected to the upper surface of the pad 220 via a sliding mechanism. Specifically, the cap 210 is designed to slide along the surface of the pad 220 along a preset path. Several parallel grooves 221 are arranged on the top surface of the pad 220 to constrain the sliding trajectories of the two caps 210, ensuring they can move closer or further apart in a predetermined manner, achieving contact and separation. The contact surfaces of the two caps 210 feature an inwardly recessed design, forming matching notches 211. After the caps 210 are fully engaged, these notches 211 seamlessly join to form a complete through-hole. The size and shape of this through-hole match the drainage tube 100, allowing it to pass smoothly without obstruction.

[0036] Preferably, such as Figures 1-3 As shown, to maintain the fit of the caps 210 when no external force is applied, elastic elements 222 are integrated inside the groove 221. These elastic elements 222 can be springs, with one end connected to the inner wall of the groove 221 and the other end coupled to the slider 213 fixed to the bottom surface of the caps 210. Through this connection method, the elastic elements 222 can continuously provide elastic force, ensuring that the two caps 210 can automatically maintain a fitted state under the action of elastic force when no external force is applied, thereby maintaining the stability and reliability of the drainage tube 100 channel.

[0037] Preferably, such as Figures 1-3As shown, the notch 211 of the cap 210 includes multiple protrusions 212 on its circumferential sidewall. These protrusions 212 are evenly arranged at certain intervals to achieve effective contact and fixation with the drainage tube 100. Specifically, when two caps 210 are fully fitted, their respective protrusions 212 can abut against the wall of the drainage tube 100. The protrusions 212 can be designed to be arc-shaped. On the contact surface of the protrusion 212 away from the notch 211, the surface of each protrusion 212 that contacts the wall of the drainage tube 100 is ensured to be consistent with the curvature of the wall. This design ensures a tight fit between the protrusion and the wall of the drainage tube 100, thus providing stable support. More preferably, when the contact surfaces of all the protrusions 212 form a virtual circle when the caps 210 are fitted, the diameter of this virtual circle is designed to be smaller than the outer diameter of the drainage tube 100. This design not only enhances the clamping force of the protrusion 212 on the drainage tube 100, but also effectively prevents the drainage tube 100 from accidentally slipping or falling off during use, ensuring the safety and stability of the entire device. Through this structural optimization, the connection between the cap 210 assembly and the drainage tube 100 is more secure, meeting the high requirements for stability and reliability in medical applications.

[0038] Preferably, such as Figures 1-3 As shown, both the transition cylinder 230 and the drainage seat 240 in the cover assembly 200 have hollow cavity structures. This design aims to create a drainage cavity 250 that can accommodate and guide the insertion of the drainage tube 100. Specifically, a sleeve 241 is provided at the distal opening of the drainage seat 240. This sleeve has a frustum-shaped structure that gradually narrows proximally along the axis of the drainage seat 240. The top opening of the sleeve 241 is smaller than its bottom opening. This structural feature ensures that the drainage tube 100 can be tightly fitted onto the sidewall of the sleeve 241 with a moderate expansion of the distal opening. The sleeve 241 plays multiple roles during the installation of the drainage tube 100. First, it effectively limits the range of motion of the drainage tube 100, preventing it from exceeding the coverage boundary set by the cover assembly 200, thereby avoiding tissue damage that might be caused by the drainage tube 100 excessively extending into the abdominal cavity. Secondly, the sleeve 241, with its tapering shape, allows the drainage tube 100 to undergo slight elastic expansion during the sleeve connection process. This expansion not only increases the physical contact area between the drainage tube 100 and the cover assembly 200, but also enhances the sealing performance between them thanks to the elastic recovery force of the drainage tube 100 material itself. This design effectively prevents ascites fluid in the abdominal cavity from leaking out through the tiny gap between the drainage cavity 250 and the drainage tube 100, thus ensuring the safety and effectiveness of the drainage process.

[0039] Preferably, such as Figures 6-8As shown, the peritoneal effusion drainage device of this invention includes a dressing portion 300, which is designed to fit snugly against the patient's skin to ensure stability during drainage. The dressing portion 300 consists of two main parts: a first dressing 310 and a second dressing 320, both of which can be circular or square in shape to suit different clinical needs. These two parts are configured to overlap the radial sides of the cap 210 and at least partially cover the upper surface of the pad 220. At least two Velcro straps 370 are fixedly connected to the upper surface of the first dressing 310. These Velcro straps 370, arranged radially on both sides of the drainage tube 100, ensure stable fixation of the drainage tube 100 on the dressing portion 300, preventing displacement during drainage. Meanwhile, the surface of the second dressing 320 is provided with a textured material specifically designed for adhesion to the Velcro straps 370. This material has excellent adhesion compatibility and durability, ensuring a strong and durable connection between the Velcro straps 370 and the second dressing 320. In practical applications, the two Velcro straps 370 on the first dressing 310 are attached to the surface of the second dressing 320 at radially opposite sides of the drainage tube 100. Through a cross-shaped fixation, the dressing pulls and lifts the skin around the drainage opening towards its center, effectively wrapping the drainage tube 100 and preventing ascites leakage along the tube. This not only improves the comfort and safety of the drainage process but also effectively avoids skin irritation or damage that may be caused by the movement of the drainage tube 100. As the drainage process progresses, the abdominal wall tissue will relax, and the Velcro straps 370 on the dressing can be readjusted to maintain a tight wrapping and compression of the drainage tube 100 by the skin around it, thereby preventing ascites leakage.

[0040] Preferably, such as Figure 9As shown, the first patch 310 and the second patch 320 are designed as a layered structure to optimize skin fit, breathability, and structural strength. Both patches employ a multi-layered construction, with the bottom layer closest to the skin being a release layer 330. This layer has low-adhesion properties, facilitating initial positioning of the patch and preventing skin damage during removal. Above the release layer 330 is a breathable layer 340, which is covered with evenly distributed pores. These pores allow air circulation, helping to reduce skin moisture and improve wearing comfort. The structural design of the breathable layer 340 ensures good gas exchange while maintaining a balanced microenvironment between the patch and the skin. Adjacent to the breathable layer 340 is a structural layer 350, which has a mesh-like shape and is typically made of a cotton-like material incorporating a mesh structure. This design not only enhances the overall structural strength of the patch but also provides additional flexibility, allowing the patch to adapt to the contours of different areas of the skin and ensuring a close fit. The porous nature of the structural layer 350 further enhances breathability, helping to prevent discomfort caused by prolonged pressure on the skin. An attachment layer 360 is positioned above the structural layer 350. At least two Velcro straps 370 are securely connected to the attachment layer 360 of the first patch 310. The attachment layer 360 of the second patch 320 is specially designed with a textured material to work with the Velcro straps 370. This material has excellent adhesion and abrasion resistance, ensuring a stable connection even after repeated application and separation.

[0041] Preferably, the drainage tube 100 is designed as a smooth catheter with a uniform diameter to minimize frictional resistance with the abdominal wall tissue, thereby facilitating the insertion of the drainage tube 100 and ensuring its stable maintenance within the abdominal cavity. The height of the drainage seat 240 connected to the end of the drainage tube 100 is set to approximately 3 mm. This size design ensures that the drainage seat 240 is neither too protruding and causing patient discomfort, nor too low and difficult to securely connect with the drainage tube 100. The outer diameter of the lower surface of the drainage seat 240 is slightly larger than the drainage tube 100 itself by 1-2 Fr. This design allows the drainage seat 240 to be smoothly inserted into the abdominal cavity together with the drainage tube 100 through the puncture port. In addition, the edge of the upper surface of the drainage seat 240 is provided with a chamfered structure. This feature enhances the smoothness of the edge of the drainage seat 240 and reduces the risk of scratches or abrasions to the skin.

[0042] It should be noted that the above specific embodiments are exemplary. Those skilled in the art can devise various solutions inspired by the disclosure of this utility model, and these solutions all fall within the scope of this utility model and its protection scope. Those skilled in the art should understand that this utility model specification and its drawings are illustrative and do not constitute a limitation on the claims. The protection scope of this utility model is defined by the claims and their equivalents. Throughout the text, features introduced by "preferred" are merely optional and should not be construed as mandatory. Therefore, the applicant reserves the right to abandon or delete relevant preferred features at any time.

Claims

1. A device for draining ascites, characterized in that, Includes a cover assembly (200) and a drainage tube (100) capable of being inserted into the cover assembly (200). The cover assembly (200) includes a pad (220) and two caps (210) slidably connected to the upper surface of the pad (220). The two caps (210) can fit together, and the end faces of the two caps are recessed inward to form a notch (211) for the drainage tube (100) to pass through. The lower surface of the pad (220) is connected to a transition cylinder (230) and a drainage seat (240), both of which have a drainage cavity (250) that allows the drainage tube (100) to pass through. The distal opening of the drainage seat (240) is provided with a sleeve (241) having a frustum structure that tapers towards the proximal end along the axis of the drainage seat (240). The top opening of the sleeve (241) is smaller than the bottom opening, so that the drainage tube (100) can be sleeved on the side wall of the sleeve (241) in a form where the distal opening portion is expanded.

2. The apparatus according to claim 1, characterized in that, The surface of the pad (220) is provided with a plurality of grooves (221) to define the sliding direction of the two caps (210) respectively. An elastic element (222) is disposed inside the groove (221). The elastic element (222) is connected to a slider (213) disposed on the bottom surface of the cap (210) so that the two caps (210) can remain in contact with each other under the action of the elastic element (222) when no external force is applied.

3. The apparatus according to claim 2, characterized in that, The outer diameter of the transition tube (230) is smaller than the diameter of the upper top surface of the drainage seat (240), and a chamfer structure is provided at the edge of the upper top surface of the drainage seat (240) to reserve a recessed space for accommodating the skin between the pad (220) and the upper top surface of the drainage seat (240).

4. The apparatus according to claim 3, characterized in that, The lower surface of the pad (220) that contacts the skin is provided with an anti-slip texture, and the height of the transition cylinder (230) is configured to match the thickness of the skin to improve the stability of the device placed on the skin.

5. The apparatus according to claim 4, characterized in that, The cap (210) has a plurality of protrusions (212) spaced apart on the circumferential sidewall of the notch (211). When two caps (210) are in contact with each other, the protrusions (212) can abut against the wall of the drainage tube (100).

6. The apparatus according to claim 5, characterized in that, The contact surface of the protrusion (212) abutting against the wall of the drainage tube (100) is adapted to the curvature of the tube wall. When the two caps (210) are in contact with each other, the diameter of the virtual circle formed by the contact surfaces of all the protrusions (212) is smaller than the outer diameter of the drainage tube (100).

7. The apparatus according to claim 1, characterized in that, The device includes an applicator (300) that can be attached to the skin, the applicator (300) including a first applicator (310) and a second applicator (320) arranged in pairs, the first applicator (310) and the second applicator (320) being configured to overlap the radial sides of the cap (210) and at least partially cover the upper surface of the pad (220).

8. The apparatus according to claim 7, characterized in that, At least two Velcro straps (370) are fixedly connected to the upper surface of the first patch (310), and the surface of the second patch (320) is provided with a rough surface for bonding with the Velcro straps (370). The two Velcro straps (370) of the first patch (310) are bonded to the surface of the second patch (320) in such a way that they are located on both radial sides of the drainage tube (100).

9. The apparatus according to claim 8, characterized in that, The first patch (310) and the second patch (320) are configured as a layered structure, wherein the layer of both patches close to the skin is a release layer (330), and a breathable layer (340) with multiple pores is provided above the release layer (330).

10. The apparatus according to claim 9, characterized in that, A mesh-like structural layer (350) is provided above the breathable layer (340), and an adhesive layer (360) is provided above the structural layer (350). The Velcro (370) is connected to the adhesive layer (360) of the first patch (310), and the adhesive layer (360) of the second patch (320) is configured as a textured surface that cooperates with the Velcro (370).

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