Drainage tube and drainage apparatus
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- MICRO-TECH (NANJING) CO LTD
- Filing Date
- 2025-12-15
- Publication Date
- 2026-06-25
Smart Images
Figure CN2025142612_25062026_PF_FP_ABST
Abstract
Description
A drainage tube and drainage device
[0001] Cross-references to related applications
[0002] This application claims priority to Chinese Patent Application No. 2024231684336, filed on December 20, 2024, entitled "A Drainage Tube and Drainage Device"; and to Chinese Patent Application No. 2025110501813, filed on July 29, 2025, entitled "A Drainage Tube and Drainage Device", the entire contents of which are incorporated herein by reference. Technical Field
[0003] This application relates to the field of medical device technology, and more specifically, to a drainage tube and drainage device. Background Technology
[0004] In recent years, endoscopic vacuum therapy (EVT) has become a safe and effective method for treating gastrointestinal perforations, fistulas, and anastomotic leaks. This method involves inserting a sponge into the fistula at the distal end of a drainage tube, and connecting the proximal end of the tube to a negative pressure device to perform negative pressure drainage of the fistula. Continuous negative pressure suction effectively aspirates exudate or gastrointestinal secretions from the wound, promoting perfusion and granulation tissue proliferation.
[0005] However, during negative pressure drainage treatment, granulation tissue grows into the sponge, causing the granulation tissue to pull on the sponge during the subsequent removal of the drainage tube, leading to bleeding and affecting the treatment effect.
[0006] Public content
[0007] The purpose of this application is to provide a drainage tube and drainage device that can reduce bleeding in granulation tissue and improve the therapeutic effect of negative pressure drainage.
[0008] The embodiments of this application are implemented as follows:
[0009] In a first aspect, this application provides a drainage tube, comprising:
[0010] The drainage part has a first drainage channel and a first drainage hole, the first drainage hole being connected to the first drainage channel;
[0011] A porous and loose structure, wherein the porous and loose structure covers the drainage portion; and
[0012] A granulation tissue barrier structure, wherein the granulation tissue barrier structure covers the porous loose structure, and the granulation tissue barrier structure is provided with a second drainage hole;
[0013] The second drainage hole, the porous loose structure, the first drainage hole, and the first drainage channel are connected.
[0014] In an optional embodiment, there are multiple first drainage holes, all of which are connected to the first drainage channel and the porous loose structure; there are also multiple second drainage holes, all of which are connected to the porous loose structure.
[0015] In an optional embodiment, a plurality of the first drainage holes are spaced apart along the extension direction of the drainage portion; and / or,
[0016] Multiple second drainage holes are spaced apart along the extension direction of the granulation barrier structure.
[0017] In an optional embodiment, the number of the second drainage holes is greater than or equal to the number of the first drainage holes, and the diameter of the second drainage hole is smaller than the diameter of the first drainage hole.
[0018] In an optional embodiment, the drainage tube further includes a drainage tube body, the distal end of which is connected to the proximal end of the drainage portion, and the drainage tube body has a second drainage channel that communicates with the first drainage channel.
[0019] In an optional embodiment, the distal end of the drainage portion has a first opening, which communicates with the first drainage channel; the proximal end of the drainage tube body has a second opening, which communicates with the second drainage channel.
[0020] In an optional embodiment, the hardness of the proximal end of the drainage tube body is greater than or equal to the hardness of the drainage portion.
[0021] Secondly, the drainage device provided in this application includes a negative pressure device and the drainage tube, wherein the negative pressure device is connected to the proximal end of the drainage part and communicates with the first drainage channel.
[0022] In an optional embodiment, the drainage device further includes a connector detachably disposed at the proximal end of the drainage portion, and the negative pressure device is connected to the proximal end of the connector.
[0023] In an optional embodiment, the drainage tube further includes a first support tube and a connecting end cap; the drainage tube further includes a first support tube and a connecting end cap; the first support tube passes through the interior of the drainage tube body and the drainage portion, and the first support tube is configured to support the inner walls of the drainage tube body and the drainage portion; the connecting end cap is connected to the proximal end of the first support tube, and the middle part of the connecting end cap protrudes to form an insertion portion that can be inserted into the drainage tube body.
[0024] In an optional embodiment, the first support tube is configured as a solid structure, or the first support tube is configured as a hollow structure to form a hollow space, and the connecting end cap has a through hole, which communicates with the hollow space to form a connecting channel for the guide wire to pass through.
[0025] In an optional embodiment, the drainage device further includes a second support tube;
[0026] The second support pipe includes interconnected straight sections and overlapping sections;
[0027] The straight section is configured to be disposed inside the proximal end of the drainage portion, and the overlapping section is configured to abut against the proximal opening of the drainage portion.
[0028] The beneficial effects of the embodiments of this application include:
[0029] The drainage tube includes a drainage section, a porous loose structure, and a granulation tissue barrier structure. The drainage section has a first drainage channel and a first drainage hole, which is connected to the first drainage channel. The porous loose structure covers the drainage section, and the granulation tissue barrier structure covers the porous loose structure. The granulation tissue barrier structure has a second drainage hole. The second drainage hole, the porous loose structure, the first drainage hole, and the first drainage channel are connected.
[0030] As is easily understood, the porous structure serves to connect the second drainage hole with the first drainage hole. During negative pressure drainage, exudate and other fluids from the fistula can pass through the second drainage hole, the porous structure, and the first drainage hole, entering the first drainage channel of the drainage section. Then, under negative pressure, the fluid is drawn out from the drainage tube. Furthermore, because the granulation tissue barrier structure covers the porous structure, it can prevent granulation tissue from growing into the porous structure to a certain extent. Thus, during subsequent drainage tube removal, it can avoid the pulling between the granulation tissue and the granulation tissue barrier structure and the porous structure, thereby reducing bleeding from the granulation tissue and improving the therapeutic effect of negative pressure drainage.
[0031] The drainage device includes the drainage tube, which has all the beneficial effects of the drainage tube. Attached Figure Description
[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 is a schematic diagram of the use of the drainage device provided in the embodiment of this application;
[0034] Figure 2 is a schematic diagram of the drainage tube provided in an embodiment of this application;
[0035] Figure 3 is an exploded view of the drainage tube provided in the embodiment of this application;
[0036] Figure 4 is a cross-sectional view of the drainage tube provided in an embodiment of this application;
[0037] Figure 5 is a cross-sectional view of the drainage tube with a first support tube provided in an embodiment of this application;
[0038] Figure 6 is a three-dimensional structural diagram of the drainage tube with a connecting end cap provided in an embodiment of this application;
[0039] Figure 7 is a front view schematic diagram of the drainage tube with a connecting end cap provided in an embodiment of this application;
[0040] Figure 8 is a cross-sectional view of the drainage tube with a connecting end cap and a first support tube provided in an embodiment of this application;
[0041] Figure 9 is a cross-sectional view of the drainage tube with a connecting end cap and a second support tube provided in an embodiment of this application;
[0042] Figure 10 shows a schematic diagram of two different implementations of the second support tube;
[0043] Figure 11 is a schematic diagram of the use of the drainage tube provided in the embodiment of this application.
[0044] Icons: 1000-Drainage device; 100-Drainage tube; 10-Drainage section; 11-First drainage channel; 12-First drainage hole; 13-First opening; 20-Porous loose structure; 30-Granular tissue barrier structure; 31-Second drainage hole; 40-Drainage tube body; 41-Second drainage channel; 42-Second opening; 50-First support tube; 60-Connecting end cap; 61-Insertion section; 62-Sliding groove; 70-Second support tube; 71-Straight section; 72-Overlapping section; 200-Negative pressure device; 300-Connector; 310-Male connector; 311-Protrusion; 320-Female connector; 330-Sealing ring. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0046] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0047] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0048] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0049] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0050] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0051] As described in the background section, endoscopic vacuum therapy (EVT) is a method for treating gastrointestinal perforations, fistulas, and anastomotic leaks. This method involves inserting a sponge into the fistula through the distal end of a drainage tube, and connecting the proximal end of the drainage tube to a negative pressure device for negative pressure drainage of the fistula. However, during negative pressure drainage, granulation tissue can grow into the sponge. This can cause bleeding during subsequent removal of the drainage tube due to the granulation tissue pulling on the sponge, thus affecting the treatment outcome.
[0052] Based on this, please refer to Figures 1-4. The embodiments of this application provide a drainage tube 100 and a drainage device 1000, which can effectively improve the aforementioned technical problems. Specifically, it can reduce bleeding from granulation tissue and improve the therapeutic effect of negative pressure drainage. The drainage tube 100 and drainage device 1000 will be described in detail below.
[0053] Please refer to Figure 1, which is a schematic diagram of the drainage device 1000 provided in this embodiment. Referring to Figure 1, the drainage device 1000 includes a drainage tube 100 and a negative pressure device 200, with the negative pressure device 200 connected to the proximal end of the drainage tube 100. That is, during negative pressure drainage treatment, the distal end of the drainage tube 100 extends into the fistula opening. Under the negative pressure provided by the negative pressure device 200, exudate and other fluids from the fistula opening are drawn into the internal channel of the drainage tube 100 and then discharged from the proximal end of the drainage tube 100, thereby achieving the removal of exudate, promoting wound healing, reducing the risk of infection, and accelerating tissue repair.
[0054] Further, please refer to Figures 2-4 and Figure 11. Figure 2 is a structural schematic diagram of the drainage tube 100 provided in this embodiment, Figure 3 is an exploded view of the drainage tube 100 provided in this embodiment, Figure 4 is a cross-sectional view of the drainage tube 100 provided in this embodiment, and Figure 11 is a schematic diagram of the drainage tube 100 provided in this embodiment being placed in a human tissue fistula. In conjunction with Figures 2-4, the drainage tube 100 includes a drainage portion 10, a porous loose structure 20, and a granulation tissue barrier structure 30. The drainage portion 10 has a first drainage channel 11 and a first drainage hole 12, which communicates with the first drainage channel 11. The porous loose structure 20 covers the drainage portion 10, and the granulation tissue barrier structure 30 covers the porous loose structure 20. The granulation tissue barrier structure 30 has a second drainage hole 31. The second drainage hole 31, the porous loose structure 20, the first drainage hole 12, and the first drainage channel 11 are connected.
[0055] Referring to Figures 1-4, in this embodiment, the negative pressure device 200 is connected to the proximal end of the drainage section 10 and communicates with the first drainage channel 11. It is easily understood that the porous loose structure 20 serves to connect the second drainage hole 31 with the first drainage hole 12. During negative pressure drainage treatment, exudate and other fluids from the fistula can pass through the second drainage hole 31, the porous loose structure 20, and the first drainage hole 12, entering the first drainage channel 11 of the drainage section 10. Then, under the action of negative pressure, the fluid is drawn out from the drainage tube 100. Furthermore, since the granulation tissue barrier structure 30 covers the porous loose structure 20, it can prevent granulation tissue from growing into the porous loose structure 20 to a certain extent. Thus, during the subsequent removal of the drainage tube 100, it can avoid pulling between the granulation tissue and the granulation tissue barrier structure 30 and the porous loose structure 20, thereby reducing bleeding from the granulation tissue and improving the therapeutic effect of negative pressure drainage.
[0056] To facilitate the insertion of the drainage tube 100 into the body and its connection to the negative pressure device 200 after extending out of the body, in this embodiment, the drainage tube 100 further includes a drainage tube body 40. The distal end of the drainage tube body 40 is connected to the proximal end of the drainage section 10, and the drainage tube body 40 has a second drainage channel 41, which is connected to the first drainage channel 11. That is, the proximal end of the drainage tube body 40 is connected to the negative pressure device 200, and the second drainage channel 41 is connected to the negative pressure device 200. Under the negative pressure of the negative pressure device 200, the exudate and other fluids from the wound pass through the first drainage channel 11 and the second drainage channel 41 in sequence and are discharged from the proximal end of the drainage tube body 40.
[0057] In addition, the hardness of the proximal end of the drainage tube body is greater than or equal to the hardness of the drainage portion. The higher hardness of the proximal end of the drainage tube body provides good support and propulsion during puncture or insertion, making it easier for doctors to accurately control the path of the drainage tube into the body and reducing the difficulty of the operation. The lower hardness of the drainage portion provides good flexibility and compliance, enabling it to adapt to the complex anatomical structures of internal cavities or organs and reduce irritation and damage to surrounding tissues. It should be noted that the drainage tube and the drainage portion are an integral structure. During the manufacturing process, different hardening agents are added to achieve different hardnesses between the proximal ends of the drainage tube and the drainage portion at both ends.
[0058] Referring to Figures 1 and 2, in order to facilitate the disassembly and installation of the drainage tube 100 and the negative pressure device 200, the drainage device 1000 also includes a connector 300. The connector 300 is detachably disposed at the proximal end of the drainage section 10. Specifically, in this embodiment, the fixed connector 300 is detachably disposed at the proximal end of the drainage tube body 40; the negative pressure device 200 is connected to the proximal end of the connector 300.
[0059] By making the connector 300 detachable, the insertion of the drainage tube 100 can be facilitated. Specifically, the drainage tube 100 is first inserted into the body, then the connector 300 is detached. After the proximal end of the drainage tube 100 protrudes outside the body, the connector 300 is reconnected. This avoids interference between the connector 300 and the walls of organs such as the digestive tract, intestines, and nasal cavity during the insertion process, preventing damage. It also ensures smooth insertion and removal of the drainage tube 100. To facilitate insertion of the drainage tube 100, in this embodiment, the drainage device 1000 also includes a guide wire (not shown). The guide wire is configured to pass through the drainage tube 100 and has a guiding function, accurately delivering the drainage tube 100 to the insertion site.
[0060] Specifically, referring to Figure 4, the distal end of the drainage section 10 has a first opening 13, which communicates with the first drainage channel 11; the proximal end of the drainage tube body 40 has a second opening 42, which communicates with the second drainage channel 41. Thus, when the drainage tube 100 is delivered to the insertion site via a guide wire, the guide wire passes sequentially through the first opening 13, the first drainage channel 11, the second drainage channel 41, and the second opening 42; after the entire drainage tube 100 has reached the target position, the guide wire is then removed from the second opening 42.
[0061] Furthermore, in order to improve the effect of negative pressure suction of liquid, the number of first drainage holes 12 can be set to multiple, and multiple first drainage holes 12 are all connected to the first drainage channel 11 and the porous loose structure 20; the number of second drainage holes 31 can also be set to multiple, and multiple second drainage holes 31 are all connected to the porous loose structure 20.
[0062] Referring to Figures 3 and 4, it should be noted that in this embodiment, multiple first drainage holes 12 are spaced apart along the extension direction of the drainage section 10, which can draw liquid from the porous and loose structure 20 into the internal channel of the drainage section 10, that is, into the first drainage channel 11, at multiple different locations, thereby improving the effect of negative pressure suction of liquid and thus improving the treatment effect.
[0063] Of course, in other embodiments, the arrangement of the plurality of first drainage holes 12 is not limited to this; it can also be arranged in a ring, staggered, spiral, or array, etc.
[0064] Referring to Figures 2 and 3, in order to improve the effect of negative pressure aspiration of liquid, in this embodiment, multiple second drainage holes 31 are spaced apart along the extension direction of the granulation barrier structure 30, which can send the exudate and other liquids from the wound into the porous loose structure 20 from multiple different locations, thereby realizing the aspiration of liquids from different parts of the fistula wound and improving the therapeutic effect of negative pressure drainage.
[0065] Similarly, in other embodiments, the arrangement of the plurality of second drainage holes 31 is not limited to this; they can also be arranged in a ring-shaped interval, staggered arrangement, spiral arrangement, or array arrangement, etc.
[0066] Furthermore, in this embodiment, the number of second drainage holes 31 is greater than or equal to the number of first drainage holes 12, thereby making the second drainage holes more densely packed than the first drainage holes. Moreover, the aperture of the second drainage holes 31 is smaller than the aperture of the first drainage holes 12, which can achieve a more uniform liquid distribution in the local area, reduce the risk of uneven impact force or tissue damage caused by excessive local flow velocity, and is suitable for clinical scenarios where the gentleness of the drainage process is highly required. In addition, setting a finer drainage structure in the end area that contacts the tissue can reduce the degree of stimulation to the surrounding tissue, improve the adaptability and comfort of the device in the body, and is especially suitable for long-term indwelling medical devices.
[0067] Alternatively, as an alternative, multiple first drainage holes 12 can be configured one-to-one with multiple second drainage holes 31. This can shorten the flow path of exudate and other liquids into the first drainage channel 11 of the drainage section 10, thereby further improving the negative pressure suction effect and correspondingly improving the therapeutic effect of negative pressure drainage.
[0068] Referring to Figure 3, the size of the drainage section 10 is larger than that of the main body 40 of the drainage tube. It should be noted that if both the drainage section 10 and the main body 40 are cylindrical, the aforementioned size relationship can be understood as the diameter of the drainage section 10 being larger than the diameter of the main body 40. In other words, the drainage tube 100 as a whole can be understood as a reducing tube, with a larger diameter at the fistula site. Referring to Figures 3 and 4, the size of the first drainage channel 11 is larger than that of the second drainage channel 41. This design increases the flow area of exudate and other fluids in the first drainage channel 11, ensuring a larger flow of fluid and improving the effectiveness of subsequent negative pressure aspiration. Furthermore, the relatively small size of the main body 40 facilitates its passage through the internal passages of organs such as the digestive tract, intestines, and nasal cavity.
[0069] It should be noted that in this embodiment, the porous and loose structure 20 is specifically gauze. Gauze has good air permeability, water absorption, and softness, which can ensure the therapeutic effect of negative pressure drainage. In addition, gauze also has a certain filtering function, which can filter out exudate and other liquids. While absorbing liquids to keep the wound dry, it can also play a cleaning role, thereby reducing the risk of wound infection.
[0070] Of course, in other embodiments, the porous and loose structure 20 can also be a sponge, which also has the characteristics of breathability, water absorption, softness, and filtration, and can play a role in absorbing, filtering, drying, and cleaning the wound. It is easy to understand that the specific material of the porous and loose structure 20 is not limited to this; as long as it has the characteristics of being porous and loose, allowing liquid to pass through and ensuring that the liquid flowing in from the second drainage hole 31 passes smoothly into the first drainage hole 12, it is acceptable.
[0071] In addition, it should be noted that in this embodiment, the granulation tissue barrier structure 30 is specifically a heat shrink tubing, which has the characteristics of sealing and waterproofing, corrosion resistance, flexibility and wear resistance. It can effectively prevent granulation tissue from growing into the porous loose structure 20, while avoiding the leakage of liquid from the porous loose structure 20.
[0072] Of course, in other embodiments, the granulation tissue barrier structure 30 can also be a protective membrane or other protective structures, as long as it can prevent the granulation tissue from growing into the porous loose structure 20 and prevent the liquid from seeping out of the porous loose structure 20.
[0073] In an optional embodiment, as shown in Figures 5, 6, 7, and 8, the drainage tube further includes a first support tube 50 and a connecting cap 60. The first support tube 50 passes through the interior of the drainage tube body 40 and the drainage portion 10, and is configured to support the inner walls of the drainage tube body 40 and the drainage portion 10. The first support tube provides a uniformly distributed support force, effectively enhancing the structural strength of the entire drainage tube and preventing deformation or collapse of the drainage tube due to external pressure or bending during installation and use. The first support tube 50 can directly support the inner walls of the drainage tube body 40 and the drainage portion 10, preventing wrinkles or collapse of the inner walls when subjected to external compression or internal negative pressure. The stability and smoothness of the inner walls help maintain the patency of the drainage channel, reduce the risk of blockage, and improve drainage efficiency. In addition, since the first support tube 50 provides additional support, the drainage tube body 40 and the drainage portion 10 can be made of softer, more biocompatible materials, thereby improving patient comfort and safety.
[0074] The connection between the connecting end cap 60 and the proximal end of the first support tube 50 enables a stable connection and convenient disassembly / removal between the first support tube 50 and the main body of the drainage tube 40. Specifically, when it is necessary to pull out the first support tube 50 from the drainage tube 100, the user can pull out the first support tube 50 by driving the first support tube 50 through the connecting end cap 60.
[0075] Furthermore, the middle part of the connecting end cap 60 protrudes outward to form an insertion part 61, which can be inserted into the connector 300 to realize the plug-in fixation between the connecting end cap 60 and the connector 300, thereby facilitating the passage, installation and removal of the first support tube 50.
[0076] The first support tube 50 can be configured as a solid structure made of multiple steel wire ropes, which cannot pass through the guide wire. Alternatively, the first support tube 50 can be configured as a hollow structure made of a single steel wire rope spirally wound. When the first support tube 50 is configured as a hollow structure, a hollow space is formed inside. This hollow space can be configured to accommodate the guide wire. The connecting end cap 60 is provided with a through hole, which communicates with the hollow space inside the first support tube 50, thereby forming a connecting channel from the outside of the connecting end cap 60 to the inside of the first support tube 50. This connecting channel provides a smooth path for the guide wire to pass through, thus facilitating the insertion of the drainage tube 100 into the body through the guidance of the guide wire during operation.
[0077] Additionally, it should be noted that when the drainage tube 100 is implanted into the fistula using a guidewire procedure, the first support tube 50 is configured to form a hollow space for the guidewire to pass through. When the drainage tube 100 is implanted into the fistula using a combination of endoscopy and foreign body forceps, the first support tube 50 can be configured to form a hollow space or it can be configured as a solid structure made of multiple steel wire ropes.
[0078] The connector 300 is specifically configured as a Luer connector, which includes a male connector 310 and a female connector 320, as well as a sealing ring 330 disposed in the female connector 320. The female connector 320 is closer to the distal end than the male connector 310. After the drainage tube 100 is inserted into the body, the drainage tube 100 needs to be connected to the negative pressure device 200. Loosen the connecting end cap 60 from the male connector 310, and then pull out the first support tube 50 from the drainage tube 100. If the drainage tube is inserted through a guide wire, the first support tube 50 and the guide wire need to be pulled out together. Then, remove the connector 300 from the drainage tube 100 so that the proximal end of the drainage tube 100 can be passed through the nostril. Then, assemble the connector 300 onto the drainage tube 100. First, put the female connector 320 on the drainage tube 100, and then screw the male connector 310 into the female connector 320 through the thread. The male connector 310 squeezes the sealing ring 330. The sealing ring 330 deforms under force and squeezes the drainage tube 100, thereby fixing the connector 300 onto the drainage tube 100. However, because the sealing ring 330 deforms under stress, it will compress the drainage tube 100, causing the drainage tube 100 to deform. This results in the channel at the deformation point of the drainage tube 100 becoming very small or even blocked, thus affecting the subsequent drainage effect. Therefore, to solve this technical problem, as shown in Figure 9, the drainage device also includes a second support tube 70. The second support tube 70 includes a straight section 71 and an overlapping section 72 connected to each other. The straight section 71 is configured to be located inside the proximal end of the drainage tube 100. Before assembling the connector 300, the straight section 71 is first inserted into the drainage tube 100. The size of the overlapping section 72 is larger than the proximal end of the drainage tube 100. The opening allows the overlapping section 72 to abut against the drainage tube 100, preventing the second support tube 70 from slipping into the drainage tube 100 and becoming difficult to remove. It should be noted that in order to ensure that the straight section 71 can withstand the squeezing force of the sealing ring 330, the length of the straight section 71 extending into the drainage tube 100 is greater than the location of the sealing ring 330, ensuring that there is a straight section 71 at the squeezing position of the sealing ring 330. Thus, by setting the second support tube 70, the proximal part of the drainage tube 100 is supported by the second support tube 70, effectively preventing the channel at the deformation point of the drainage tube 100 from becoming very small or even blocked when assembling the joint 300.
[0079] As shown in Figure 10, the shape of the overlapping section 72 can be set in various ways, such as trumpet shape or right angle shape. The specific shape and structure of the overlapping section 72 can be selected according to the actual situation.
[0080] In addition, to improve the deformation resistance of the second support tube 70, the second support tube 70 is made of a material with a certain degree of rigidity; preferably, the second support tube 70 is made of metal. A protrusion 311 is provided at the proximal end of the male connector 310, and a sliding groove 62 is provided on the inner wall of the connecting end cap 60. The sliding groove 62 is spiral-shaped, and the protrusion 311 can slide in the sliding groove 62, thereby installing the connecting end cap 60 on the male connector 310 by screwing.
[0081] In summary, the embodiments of this application provide a drainage tube 100 and a drainage device 1000. The drainage tube 100 includes a drainage portion 10, a porous loose structure 20, and a granulation tissue barrier structure 30. The drainage portion 10 has a first drainage channel 11 and a first drainage hole 12, which communicates with the first drainage channel 11. The porous loose structure 20 covers the drainage portion 10, and the granulation tissue barrier structure 30 covers the porous loose structure 20. The granulation tissue barrier structure 30 has a second drainage hole 31. The second drainage hole 31, the porous loose structure 20, the first drainage hole 12, and the first drainage channel 11 are connected.
[0082] As is easily understood, the porous loose structure 20 serves to connect the second drainage hole 31 with the first drainage hole 12. During negative pressure drainage treatment, exudate and other fluids from the fistula can pass through the second drainage hole 31, the porous loose structure 20, and the first drainage hole 12, and enter the first drainage channel 11 of the drainage part 10. Then, under the action of negative pressure, the fluid is drawn out from the drainage tube 100. Furthermore, since the granulation tissue barrier structure 30 covers the porous loose structure 20, it can prevent granulation tissue from growing into the porous loose structure 20 to a certain extent. Thus, when the drainage tube 100 is removed later, it can avoid the pulling between the granulation tissue and the granulation tissue barrier structure 30 and the porous loose structure 20, thereby reducing the bleeding of granulation tissue and improving the therapeutic effect of negative pressure drainage.
[0083] The drainage device 1000 includes the drainage tube 100, which has all the functions and beneficial effects of the drainage tube 100.
[0084] The above description is merely a specific embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. Industrial applicability
[0085] In summary, the embodiments of this application provide a drainage tube and a drainage device, which, by setting a granulation tissue blocking structure, can prevent granulation tissue from growing into the porous and loose structure while satisfying negative pressure adsorption, thereby reducing bleeding of granulation tissue and improving the therapeutic effect of negative pressure drainage.
Claims
1. A drainage tube, characterized in that, include: The drainage section (10) has a first drainage channel (11) and a first drainage hole (12) is provided in the drainage section (10), and the first drainage hole (12) is connected to the first drainage channel (11); A porous loose structure (20) is provided, which covers the drainage part (10); as well as Granulation barrier structure (30), the granulation barrier structure (30) covers the porous loose structure (20), and the granulation barrier structure (30) is provided with a second drainage hole (31); The second drainage hole (31), the porous loose structure (20), the first drainage hole (12), and the first drainage channel (11) are connected.
2. The drainage tube according to claim 1, characterized in that, There are multiple first drainage holes (12), and each of the multiple first drainage holes (12) is connected to the first drainage channel (11) and the porous loose structure (20); there are multiple second drainage holes (31), and each of the multiple second drainage holes (31) is connected to the porous loose structure (20).
3. The drainage tube according to claim 2, characterized in that, A plurality of the first drainage holes (12) are spaced apart along the extending direction of the drainage portion (10); and / or, Multiple second drainage holes (31) are spaced apart along the extension direction of the granulation barrier structure (30).
4. The drainage tube according to claim 2 or 3, characterized in that, The number of the second drainage holes (31) is greater than or equal to the number of the first drainage holes (12), and the diameter of the second drainage holes (31) is smaller than the diameter of the first drainage holes (12).
5. The drainage tube according to claim 1, characterized in that, The drainage tube (100) further includes a drainage tube body (40), the distal end of which is connected to the proximal end of the drainage part (10), and the drainage tube body (40) has a second drainage channel (41) which is connected to the first drainage channel (11).
6. The drainage tube according to claim 5, characterized in that, The distal end of the drainage section (10) is provided with a first opening (13), which is connected to the first drainage channel (11); the proximal end of the drainage tube body (40) is provided with a second opening (42), which is connected to the second drainage channel (41).
7. The drainage tube according to claim 5 or 6, characterized in that, The hardness of the proximal end of the main body (40) of the drainage tube is greater than or equal to the hardness of the drainage part (10).
8. A drainage device, characterized in that, Includes a negative pressure device (200) and a drainage tube (100) as described in any one of claims 1-7, wherein the negative pressure device (200) is connected to the proximal end of the drainage portion (10) and communicates with the first drainage channel (11).
9. The drainage device according to claim 8, characterized in that, The drainage device (1000) further includes a connector (300), which is detachably disposed at the proximal end of the drainage portion (10), and the negative pressure device (200) is connected to the proximal end of the connector (300).
10. The drainage device according to claim 9, characterized in that, The drainage device also includes a first support tube (50) and a connecting end cap (60); The first support tube (50) passes through the inside of the drainage tube (100), and the first support tube (50) is configured to support the inner wall of the drainage tube (100); The connecting end cap (60) is connected to the proximal end of the first support tube (50), and the middle part of the connecting end cap (60) has an insertion part that can be inserted into the connector (300).
11. The drainage device according to claim 10, characterized in that, The first support tube (50) is configured as a solid structure. or, The first support tube (50) is configured as a hollow structure to form a hollow space, and the connecting end cap (60) has a through hole, which is connected to the hollow space to form a connecting channel for the guide wire to pass through.
12. The drainage device according to any one of claims 8-11, characterized in that, The drainage device (1000) also includes a second support tube (70); The second support pipe includes a straight section (71) and an overlapping section (72) connected to each other; The straight section (71) is configured to be disposed inside the proximal end of the drainage tube (100) to support the drainage tube (100); The overlapping section (72) is configured to abut against the proximal opening of the drainage tube (100).