Drainage tube and drainage device

Abstract

The embodiment of the invention provides a drainage tube and a drainage device, and relates to the technical field of medical instruments. The drainage tube comprises a drainage part, a porous loose structure and a granulation blocking structure, the drainage part is provided with a first drainage channel, the drainage part is provided with a first drainage hole, and the first drainage hole is communicated with the first drainage channel; the porous loose structure wraps the drainage part, the granulation blocking structure wraps the porous loose structure, and second drainage holes are formed in the granulation blocking structure; and the second drainage holes, the porous loose structure, the first drainage holes and the first drainage channels are communicated. According to the drainage tube, by arranging the granulation blocking structure, granulation can be blocked from growing into the porous loose structure while negative pressure adsorption is met, so that the condition of granulation tissue bleeding is reduced, and the treatment effect of negative pressure drainage is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a drainage tube and a drainage device. Background Art

[0002] 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 placing a sponge at the distal end of a drainage tube and extending it into the fistula. The proximal end of the tube is then connected to a negative pressure device for negative pressure drainage. Continuous negative pressure suction effectively aspirates exudates and gastrointestinal secretions from the wound, promoting perfusion and granulation tissue proliferation.

[0003] However, during the negative pressure drainage treatment, granulation tissue will grow into the sponge, causing the granulation tissue and the sponge to be pulled during the subsequent removal of the drainage tube, resulting in bleeding and affecting the treatment effect. Summary of the Invention

[0004] The object of the present invention is to provide a drainage tube and a drainage device, which can reduce bleeding of granulation tissue and improve the therapeutic effect of negative pressure drainage.

[0005] The embodiment of the present invention is achieved as follows: In a first aspect, the present invention provides a drainage tube, comprising: a drainage portion, the drainage portion having a first drainage channel and a first drainage hole formed in the drainage portion, the first drainage hole being in communication with the first drainage channel; A porous loose structure, the porous loose structure covering the drainage portion; and a granulation barrier structure, the granulation barrier structure being coated on the porous loose structure and having a second drainage hole; Wherein, the second drainage hole, the porous loose structure, the first drainage hole and the first drainage channel are connected.

[0006] In an optional embodiment, there are multiple first drainage holes, and the multiple first drainage holes are all connected to the first drainage channel and the porous loose structure; there are multiple second drainage holes, and the multiple second drainage holes are all connected to the porous loose structure.

[0007] In an optional embodiment, the plurality of first drainage holes are arranged at intervals along the extension direction of the drainage portion; and / or, The plurality of second drainage holes are arranged at intervals along the extension direction of the granulation barrier structure.

[0008] 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 aperture of the second drainage holes is smaller than the aperture of the first drainage holes.

[0009] In an optional embodiment, the drainage tube further includes a drainage tube body, the distal end of the drainage tube body is connected to the proximal end of the drainage portion, and the drainage tube body has a second drainage channel, which is connected to the first drainage channel.

[0010] In an optional embodiment, a first opening is formed at the distal end of the drainage portion, and the first opening is communicated with the first drainage channel; a second opening is formed at the proximal end of the drainage tube body, and the second opening is communicated with the second drainage channel.

[0011] 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.

[0012] In a second aspect, the drainage device provided by the present invention 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.

[0013] In an optional embodiment, the drainage device further includes a connector, which is detachably provided at the proximal end of the drainage portion, and the negative pressure device is connected to the proximal end of the connector.

[0014] In an optional embodiment, the drainage tube also includes a first support tube and a connecting end cap; the drainage tube also includes a first support tube and a connecting end cap; the first support tube is passed through the interior of the drainage tube body and the interior of the drainage part, and the first support tube is used to support the inner wall of the drainage tube body and the drainage part; the connecting end cap is connected to the proximal end of the first support tube, and the middle protrusion of the connecting end cap is formed with an insertion part that can be inserted into the drainage tube body.

[0015] 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 is connected to the hollow space to form a connecting channel for the guide wire to pass through.

[0016] In an optional embodiment, the drainage device further includes a second support tube; The second support tube includes a straight section and an overlapping section connected to each other; The straight tube section is used to be arranged inside the proximal end of the drainage portion, and the overlapping section is used to abut against the proximal opening of the drainage portion.

[0017] The beneficial effects of the embodiments of the present invention include: The drainage tube includes a drainage portion, a porous loose structure and a granulation barrier structure. The drainage portion has a first drainage channel, and the drainage portion is provided with a first drainage hole, and the first drainage hole is connected to the first drainage channel; the porous loose structure is covered on the drainage portion, the granulation barrier structure is covered on the porous loose structure, and the granulation barrier structure is provided with a second drainage hole; wherein, the second drainage hole, the porous loose structure, the first drainage hole and the first drainage channel are connected.

[0018] It is easy to understand that the porous loose structure serves to connect the second drainage hole with the first drainage hole. During negative pressure drainage treatment, liquids such as wound exudate at the fistula can pass through the second drainage hole, the porous loose structure and the first drainage hole, and enter the first drainage channel of the drainage part. Then, under the action of negative pressure, the liquid is drawn out from the drainage tube; and since the granulation barrier structure is coated on the porous loose structure, it can prevent granulation tissue from growing into the porous loose structure to a certain extent. In this way, when the drainage tube is subsequently removed, the pulling between the granulation tissue and the granulation barrier structure and the porous loose structure can be avoided, thereby reducing the bleeding of the granulation tissue and improving the therapeutic effect of negative pressure drainage.

[0019] The drainage device includes the drainage tube and has all the beneficial effects of the drainage tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the use of the drainage device provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of a drainage tube provided in an embodiment of the present invention; Figure 3 An exploded view of a drainage tube provided in an embodiment of the present invention; Figure 4 A cross-sectional view of a drainage tube provided in an embodiment of the present invention; Figure 5 A cross-sectional view of a drainage tube provided in an embodiment of the present invention with a first support tube; Figure 6 A schematic diagram of the three-dimensional structure of a drainage tube with a connecting end cap provided in an embodiment of the present invention; Figure 7 A schematic front view of the structure of a drainage tube with a connecting end cap provided in an embodiment of the present invention; Figure 8A cross-sectional view of the structure of the drainage tube provided in an embodiment of the present invention with a connecting end cap and a first support tube; Figure 9 A cross-sectional view of the structure of the drainage tube provided by an embodiment of the present invention with a connecting end cap and a second support tube; Figure 10 Schematic diagrams of the structures of two different implementations of the second support tube; Figure 11 A schematic diagram of the use of the drainage tube provided in an embodiment of the present invention.

[0022] Icons: 1000-drainage device; 100-drainage tube; 10-drainage part; 11-first drainage channel; 12-first drainage hole; 13-first opening; 20-porous loose structure; 30-granulation 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 part; 62-sliding groove; 70-second support tube; 71-straight section; 72-overlap section; 200-negative pressure device; 300-connector; 310-male connector; 311-bump; 320-female connector; 330-sealing ring. DETAILED DESCRIPTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0026] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it 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 rather that it can be slightly tilted.

[0028] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] As described in the background technology, endoscopic vacuum therapy (EVT) is a method for treating gastrointestinal perforations, fistulas, and anastomotic leaks. This method involves placing a sponge at the distal end of a drainage tube and extending it into the fistula opening. The proximal end of the drainage tube is then connected to a negative pressure device, which then performs negative pressure drainage of the fistula opening. However, during negative pressure drainage therapy, granulation tissue can grow into the sponge. This can cause traction between the granulation tissue and the sponge during subsequent removal of the drainage tube, leading to bleeding and compromising the treatment effect.

[0030] Based on this, please refer to Figures 1-4 The embodiments of the present invention provide a drainage tube 100 and drainage device 1000 that can effectively address the aforementioned technical issues, namely, they can reduce granulation tissue bleeding and enhance the therapeutic effect of negative pressure drainage. The drainage tube 100 and drainage device 1000 are described in detail below.

[0031] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the drainage device 1000 provided in this embodiment, combined with Figure 1The drainage device 1000 includes a drainage tube 100 and a negative pressure device 200, and the negative pressure device 200 is 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 is extended into the fistula opening. Under the action of the negative pressure provided by the negative pressure device 200, liquids such as wound exudate at the fistula opening will be sucked into the internal channel of the drainage tube 100 and then discharged from the proximal end of the drainage tube 100, thereby clearing the exudate, promoting wound healing, reducing the risk of infection, and accelerating tissue repair.

[0032] For further information, please refer to Figure 2-Figure 4 as well as Figure 11 , Figure 2 This is a schematic structural diagram of the drainage tube 100 provided in this embodiment. Figure 3 This is an exploded view of the drainage tube 100 provided in this embodiment. Figure 4 This is a cross-sectional view of the drainage tube 100 provided in this embodiment. Figure 11 Schematic diagram of the drainage tube 100 provided in this embodiment being placed in a fistula of human tissue, combined with Figure 2-Figure 4 The drainage tube 100 includes a drainage portion 10, a porous loose structure 20 and a granulation barrier structure 30. The drainage portion 10 has a first drainage channel 11, and the drainage portion 10 is provided with a first drainage hole 12, and the first drainage hole 12 is connected to the first drainage channel 11; the porous loose structure 20 is covered on the drainage portion 10, and the granulation barrier structure 30 is covered on the porous loose structure 20, and the granulation barrier structure 30 is provided with a second drainage hole 31; wherein, the second drainage hole 31, the porous loose structure 20, the first drainage hole 12 and the first drainage channel 11 are connected.

[0033] Please combine Figures 1-4 In this embodiment, the negative pressure device 200 is connected to the proximal end of the drainage part 10 and is connected to the first drainage channel 11; it is easy to understand that the porous loose structure 20 plays a role in connecting the second drainage hole 31 with the first drainage hole 12. During negative pressure drainage treatment, liquid such as wound exudate at 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 liquid is drawn out from the drainage tube 100; and since the granulation barrier structure 30 is coated on the porous loose structure 20, it can prevent granulation tissue from growing into the porous loose structure 20 to a certain extent. In this way, when the drainage tube 100 is subsequently removed, the pulling between the granulation tissue and the granulation barrier structure 30 and the porous loose structure 20 can be avoided, thereby reducing the bleeding of the granulation tissue and improving the therapeutic effect of negative pressure drainage.

[0034] In order to facilitate the drainage tube 100 to be placed into the body as a whole and extended from the body to be connected to the negative pressure device 200, in this embodiment, the drainage tube 100 also includes a drainage tube body 40, the distal end of the drainage tube body 40 is connected to the proximal end of the drainage part 10, and the drainage tube body 40 has a second drainage channel 41, and the second drainage channel 41 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 action of the negative pressure of the negative pressure device 200, the exudate and other liquids 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.

[0035] In addition, the hardness of the proximal end of the drainage tube body is greater than or equal to the hardness of the drainage part. The proximal end of the drainage tube body has a higher hardness, which 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 reduce the difficulty of operation. The hardness of the drainage part is lower, which provides good flexibility and compliance, and enables it to adapt to the complex anatomical structure of the body's cavity or organs, reducing stimulation and damage to surrounding tissues. It should be noted that the drainage tube and the drainage part are an integrated structure. During the production process, different hardness agents are added to achieve different hardness at the proximal ends of the drainage tube and the drainage part at both ends.

[0036] Please combine Figure 1 and Figure 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 joint 300, which is detachably arranged at the proximal end of the drainage part 10. Specifically, in this embodiment, the fixed joint 300 is detachably arranged at the proximal end of the drainage tube body 40; the negative pressure device 200 is connected to the proximal end of the joint 300.

[0037] By configuring the connector 300 to be detachable, the insertion operation of the drainage tube 100 can be facilitated. That is, the drainage tube 100 is first inserted into the human body, and then the connector 300 is removed. After the proximal end of the drainage tube 100 is extended outside the body, the connector 300 is connected. In this way, it is possible to avoid interference between the connector 300 and the walls of organs such as the digestive tract, intestines, and nasal cavity during the insertion operation of the drainage tube 100, thereby causing damage. At the same time, it is also possible to ensure that the drainage tube 100 can be smoothly inserted and removed. In order to facilitate the insertion of the drainage tube 100 into the body, in this embodiment, the drainage device 1000 also includes a guide wire (not shown in the figure). The guide wire is used to penetrate the drainage tube 100 and has a guiding function, which can accurately deliver the drainage tube 100 to the insertion site.

[0038] Specifically, please combine Figure 4The distal end of the drainage portion 10 is provided with a first opening 13, which communicates with the first drainage channel 11. The proximal end of the drainage tube body 40 is provided with 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 guidewire, the guidewire sequentially passes 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 reaches the target location, the guidewire is removed from the second opening 42.

[0039] 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 the 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 the multiple second drainage holes 31 are all connected to the porous loose structure 20.

[0040] Please combine Figure 3 and Figure 4 It should be noted that, in this embodiment, the plurality of first drainage holes 12 are arranged at intervals along the extension direction of the drainage portion 10, and the porous loose structure 20 can absorb the liquid at a plurality of different positions and send it into the internal channel of the drainage portion 10, that is, into the first drainage channel 11, thereby improving the effect of negative pressure suction of the liquid and further improving the treatment effect.

[0041] Of course, in other embodiments, the arrangement of the plurality of first drainage holes 12 is not limited thereto, and may also be an annular spaced arrangement, a staggered arrangement, a spiral arrangement, an array arrangement, or the like.

[0042] Please combine Figure 2 and Figure 3 In order to improve the effect of negative pressure suction of liquid, in this embodiment, multiple second drainage holes 31 are arranged at intervals along the extension direction of the granulation barrier structure 30, which can deliver exudates and other liquids from the wound surface into the porous loose structure 20 from multiple different positions, thereby achieving suction of liquid from different parts of the fistula wound surface and improving the therapeutic effect of negative pressure drainage.

[0043] Likewise, in other embodiments, the arrangement of the plurality of second drainage holes 31 is not limited thereto, and may also be an annular spaced arrangement, a staggered arrangement, a spiral arrangement, an array arrangement, or the like.

[0044] Furthermore, in this embodiment, the number of the second drainage holes 31 is greater than or equal to the number of the first drainage holes 12, so that the second drainage holes are denser than the first drainage holes, and the aperture of the second drainage holes 31 is smaller than the aperture of the first drainage holes 12, which can achieve more uniform liquid distribution in the local area, reduce the risk of uneven impact force or tissue damage caused by excessive local flow rate, and is suitable for clinical scenarios with high requirements for mildness during the drainage process. In addition, a finer drainage structure is set in the end area that contacts the tissue, which can reduce the degree of stimulation to the surrounding tissue and improve the adaptability and comfort of the device in the body, and is particularly suitable for long-term indwelling medical devices.

[0045] In addition, as an alternative, multiple first drainage holes 12 can also be set in a one-to-one correspondence with multiple second drainage holes 31. This can shorten the flow path of exudate and other liquids entering the first drainage channel 11 of the drainage part 10, thereby further improving the negative pressure suction effect and correspondingly improving the therapeutic effect of negative pressure drainage.

[0046] Please continue to combine Figure 3 , the size of the drainage part 10 is larger than that of the drainage tube body 40. It should be noted that if the drainage part 10 and the drainage tube body 40 are both columnar, the above-mentioned size relationship can be understood as the diameter of the drainage part 10 is larger than the diameter of the drainage tube body 40, that is, the drainage tube 100 as a whole can be understood as a reducing tube, and the diameter of the tube set at the fistula wound is larger. Combined Figure 3 and Figure 4 This means that the first drainage channel 11 is larger than the second drainage channel 41. This arrangement increases the area for exudate and other liquids from the wound to flow through the first drainage channel 11, ensuring a larger amount of liquid flow and improving the effectiveness of subsequent negative pressure suction. Furthermore, the relatively small size of the drainage tube body 40 facilitates its passage through the internal passages of organs such as the digestive tract, intestines, and nasal cavity.

[0047] It should be noted that in this embodiment, the porous loose structure 20 is specifically gauze, which has good air permeability, water absorption, and softness, and can ensure the therapeutic effect of negative pressure drainage. In addition, the gauze has a certain filtering effect, which can filter liquids such as exudates to a certain extent. While absorbing liquid to ensure the dryness of the wound surface, it also plays a cleaning role, thereby reducing the risk of wound infection.

[0048] Of course, in other embodiments, the porous loose structure 20 can also be a sponge, which also has the characteristics of air permeability, water absorption, softness and filtration, and can play the role of absorbing water, filtering, drying and cleaning the wound surface. It is easy to understand that the specific material of the porous loose structure 20 is not limited to this, as long as it has the characteristics of being porous and loose, and can achieve the passage of liquid, ensuring that the liquid flowing in from the second drainage hole 31 passes smoothly and enters the first drainage hole 12, In addition, it should be noted that in this embodiment, the granulation barrier structure 30 is specifically a heat shrink tube, which has the characteristics of sealing and waterproofing, corrosion resistance, flexibility and wear resistance. It can effectively block the granulation tissue from growing into the porous loose structure 20, while preventing liquid from seeping out of the porous loose structure 20.

[0049] Of course, in other embodiments, the granulation barrier structure 30 may also be a protective film or other structures with protective functions, as long as it can ensure that the granulation tissue is blocked from growing into the porous loose structure 20 and prevent the liquid in the porous loose structure 20 from leaking out.

[0050] In an optional embodiment, if Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown, the drainage tube also includes a first support tube 50 and a connecting end cap 60; the first support tube 50 is passed through the interior of the drainage tube body 40 and the interior of the drainage portion 10, and the first support tube 50 is used 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, which effectively enhances the structural strength of the entire drainage tube and effectively prevents the drainage tube from being deformed or collapsed 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 to prevent the inner walls from wrinkling or collapsing when subjected to external squeezing or internal negative pressure. The stability and smoothness of the inner walls help to 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 and more biocompatible materials, thereby improving patient comfort and safety.

[0051] The connection between the connecting end cap 60 and the proximal end of the first support tube 50 realizes a stable connection and convenient disassembly and assembly between the first support tube 50 and the drainage tube body 40. Specifically, when the first support tube 50 needs to be pulled out from the drainage tube 100, the user can pull the first support tube 50 out by driving the first support tube 50 through the connecting end cap 60.

[0052] Furthermore, the middle portion of the connecting end cap 60 protrudes outward to form an insertion portion 61, which can be inserted into the connector 300 to achieve plug-in fixation between the connecting end cap 60 and the connector 300, thereby facilitating the installation and extraction of the first support tube 50.

[0053] The first support tube 50 can be set as a solid structure made of multiple steel wire ropes, which cannot pass through the guide wire. The first support tube 50 can also be set as a hollow structure made of a spirally wound steel wire rope. When the first support tube 50 is set as a hollow structure, a hollow space is formed inside, which can be used to accommodate the guide wire. A through hole is provided on the connecting end cap 60, and the through hole is connected to 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. The connecting channel provides a smooth path for the passage of the guide wire, thereby facilitating the placement of the drainage tube 100 into the body through the guidance of the guide wire during operation.

[0054] In addition, it should be noted that when the drainage tube 100 is implanted into the fistula tract by a guidewire surgical method, the first support tube 50 is configured to be able to enclose and form a hollow space for the guidewire to pass through. When the drainage tube 100 is implanted into the fistula tract by a surgical method combining an endoscope and foreign body forceps, the first support tube 50 can be configured to be able to enclose and form a hollow space, or it can be configured to be a solid structure made of multiple steel ropes.

[0055] The connector 300 is specifically configured as a Luer connector, which includes a male connector 310 and a female connector 320 and 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, the connecting end cap 60 and the male connector 310 are loosened, and then the first support tube 50 is pulled out from the drainage tube 100. If the drainage tube is inserted through a guide wire, the first support tube 50 needs to be pulled out together with the guide wire, and then the connector 300 is removed from the drainage tube 100, so that the proximal end of the drainage tube 100 can be passed through the nostril, and then the connector 300 is assembled on the drainage tube 100, first the female connector 320 is put on the drainage tube 100, and then the male connector 310 is screwed, and the male connector 310 is inserted into the female connector 320 through the thread, and the male connector 310 squeezes the sealing ring 330, and the sealing ring 330 is deformed under force and squeezes the drainage tube 100, thereby fixing the connector 300 on the drainage tube 100. However, since the deformation of the sealing ring 330 will squeeze the drainage tube 100, the drainage tube 100 will be deformed, causing the channel of the drainage tube 100 to become very small or even blocked, thereby affecting the subsequent drainage effect. Therefore, in order to solve this technical problem, Figure 9As shown, the drainage device also includes a second support tube 70; the second support tube 70 includes a straight section 71 and a lap section 72 connected to each other; the straight section 71 is used to be arranged inside the proximal end of the drainage tube 100. Before assembling the joint 300, the straight section 71 is first placed inside the drainage tube 100. The size of the lap section 72 is larger than the proximal end opening of the drainage tube 100, so that the lap section 72 can abut on the drainage tube 100, preventing the second support tube 70 from sliding into the drainage tube 100 and being difficult to drain. It should be noted that in order to ensure that the straight section 71 can withstand the extrusion force of the sealing ring 330, the length of the straight section 71 extending into the drainage tube 100 is greater than the position of the sealing ring 330, ensuring that there is a straight section 71 at the extrusion position of the sealing ring 330, so that through the setting of the second support tube 70, the proximal part of the drainage tube 100 is supported by the second support tube 70, which effectively prevents the channel at the deformation position of the drainage tube 100 from becoming very small or even blocked when the joint 300 is assembled.

[0056] like Figure 10 As shown, the overlapping section 72 can be set to a variety of shapes, such as a trumpet shape or a right-angle shape. The specific shape structure of the overlapping section 72 can be selected according to actual conditions.

[0057] In addition, to improve the deformation resistance of the second support tube 70, the second support tube 70 is made of a relatively rigid material, preferably a metal material. A protrusion 311 is provided at the proximal end of the male connector 310, and a spiral sliding groove 62 is provided on the inner wall of the connecting end cap 60. The sliding groove 62 is spiral, and the protrusion 311 can slide in the sliding groove 62, thereby screwing the connecting end cap 60 onto the male connector 310.

[0058] In summary, an embodiment of the present invention provides a drainage tube 100 and a drainage device 1000, wherein the drainage tube 100 includes a drainage portion 10, a porous loose structure 20, and a granulation barrier structure 30. The drainage portion 10 has a first drainage channel 11, and the drainage portion 10 is provided with a first drainage hole 12, and the first drainage hole 12 is connected to the first drainage channel 11; the porous loose structure 20 is covered on the drainage portion 10, and the granulation barrier structure 30 is covered on the porous loose structure 20, and the granulation barrier structure 30 is provided with a second drainage hole 31; wherein the second drainage hole 31, the porous loose structure 20, the first drainage hole 12 and the first drainage channel 11 are connected.

[0059] It is easy to understand 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, liquids such as wound exudate at 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, and then under the action of negative pressure, the liquid is drawn out from the drainage tube 100; and, since the granulation barrier structure 30 is coated on the porous loose structure 20, it can prevent granulation tissue from growing into the porous loose structure 20 to a certain extent. In this way, when the drainage tube 100 is subsequently removed, the pulling between the granulation tissue and the granulation barrier structure 30 and the porous loose structure 20 can be avoided, thereby reducing the bleeding of the granulation tissue and improving the therapeutic effect of negative pressure drainage.

[0060] The drainage device 1000 includes the drainage tube 100 and has all the functions and beneficial effects of the drainage tube 100 .

[0061] The foregoing description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A drainage tube, characterized in that: include: A drainage portion (10), the drainage portion (10) having a first drainage channel (11), and the drainage portion (10) is provided with a first drainage hole (12), the first drainage hole (12) being in communication with the first drainage channel (11); A porous loose structure (20), wherein the porous loose structure (20) is coated on the drainage portion (10); as well as A granulation barrier structure (30), the granulation barrier structure (30) is coated on 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 a plurality of first drainage holes (12), and the plurality of first drainage holes (12) are all connected to the first drainage channel (11) and the porous loose structure (20); there are a plurality of second drainage holes (31), and the plurality of second drainage holes (31) are all 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 arranged at intervals along the extension direction of the drainage portion (10); and / or, The plurality of second drainage holes (31) are arranged at intervals along the extension direction of the granulation barrier structure (30).

4. The drainage tube according to claim 2, 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 aperture of the second drainage holes (31) is smaller than the aperture of the first drainage holes (12).

5. The drainage tube according to claim 1, characterized in that The drainage tube (100) further comprises a drainage tube body (40), the distal end of the drainage tube body (40) being connected to the proximal end of the drainage portion (10), and the drainage tube body (40) having a second drainage channel (41), the second drainage channel (41) being in communication with the first drainage channel (11).

6. The drainage tube according to claim 5, characterized in that: A first opening (13) is provided at the distal end of the drainage portion (10), and the first opening (13) is communicated with the first drainage channel (11); a second opening (42) is provided at the proximal end of the drainage tube body (40), and the second opening (42) is communicated with the second drainage channel (41).

7. The drainage tube according to claim 5, characterized in that The hardness of the proximal end of the drainage tube body (40) is greater than or equal to the hardness of the drainage portion (10).

8. A drainage device, characterized in that: It comprises a negative pressure device (200) and the drainage tube (100) according to any one of claims 1 to 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 comprises a connector (300), wherein the connector (300) is detachably arranged 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 further comprises a first support tube (50) and a connecting end cap (60); The first support tube (50) is passed through the interior of the drainage tube (100), and the first support tube (50) is used 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 a central protrusion of the connecting end cap (60) is formed with an insertion portion capable of being inserted into the joint (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, and the through hole is connected to the hollow space to form a connecting channel for the guide wire to pass through.

12. The drainage device according to claim 11, characterized in that The drainage device (1000) further includes a second support tube (70); The second support tube comprises a straight section (71) and an overlapping section (72) connected to each other; The straight tube section (71) is used to be arranged inside the proximal end of the drainage tube (100) to support the drainage tube (100); The overlapping section (72) is used to abut against the proximal opening of the drainage tube (100).

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