Indwelling drainage device

Abstract

The utility model relates to an indwelling drainage device which is suitable for urine drainage and comprises an outer tube, a drainage channel and a flushing channel, the inlet one-way valve is arranged at the inlet end of the flushing channel; the outlet one-way valve is arranged at the outlet end of the flushing channel; the indwelling drainage device has the advantages that the drainage channel and the flushing channel are integrated in the indwelling drainage device, and the inlet one-way valve and the outlet one-way valve are arranged at the two ends of the flushing channel to control flowing of the media. The inlet one-way valve is located at the inlet end of the flushing pipeline and used for opening or closing a flowing path of the medium liquid from the flushing channel to the inside of the flushing channel, and the outlet one-way valve is located at the outlet end of the flushing pipeline and used for opening or closing a flowing path of the medium liquid from the flushing channel to the outside of the flushing channel.

Description

Technical Field

[0001] The utility model relates to the technical field of medical indwelling drainage devices, in particular to an indwelling drainage device. Background Art

[0002] The single-channel urinary catheter, as a traditional urinary catheterization tool, although has certain convenience in clinical applications, its disadvantages cannot be ignored. First of all, its drainage effect is limited. The single-channel urinary catheter has only one channel for draining urine, making the urinary catheter not have functions other than urinary catheterization, restricting its usage flexibility. Since there is no independent flushing channel, additional tools or methods are required for cleaning and nursing the urethra, increasing the operation difficulty of medical staff and the pain of patients.

[0003] Therefore, a double-channel urinary catheter with a flushing channel appears. Its design has two independent channels, one for draining urine and the other for flushing the bladder. However, the flushing channel of the double-channel urinary catheter is in an open form. During the flushing process, if external pressure changes or the patient's body position changes, etc., it may cause the flushing fluid or urine to flow back, increasing the risk of infection. At the same time, the flushing channel requires medical staff to more precisely control the flow rate and pressure of the flushing fluid to avoid the backflow of the flushing fluid. This increases the complexity of the operation and also raises the operation risk. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] In view of the above-mentioned disadvantages and deficiencies of the prior art, the utility model provides an indwelling drainage device, which solves the technical problems in the prior art that during the flushing process of the double-channel urinary catheter, if external pressure changes or the patient's body position changes, etc., it may cause the flushing fluid or urine to flow back, increasing the risk of infection, and the flushing channel requires medical staff to more precisely control the flow rate and pressure of the flushing fluid to avoid the backflow of the flushing fluid, increasing the complexity of the operation and also raising the operation risk.

[0006] (II) Technical Solutions

[0007] In order to achieve the above purpose, the main technical solutions adopted by the utility model include:

[0008] In the first aspect, the utility model provides an indwelling drainage device suitable for urine drainage, including an outer tube and a drainage channel and a flushing channel extending along the inside of the outer tube; it also includes an inlet one-way valve provided at the inlet end of the flushing channel and an outlet one-way valve provided at the outlet end of the flushing channel; the inlet one-way valve and the outlet one-way valve can be opened unidirectionally along the flow direction of the medium when flushing the bladder through the flushing channel.

[0009] (III) Advantageous Effects

[0010] The beneficial effects of the present utility model are as follows: The indwelling drainage device can be used for draining urine, that is, the indwelling drainage device can be inserted into the patient's bladder from the patient's urethra. The indwelling drainage device integrates a liquid discharge channel and a flushing channel, and an inlet one-way valve and an outlet one-way valve are arranged at both ends of the flushing channel to control the flow of the medium. The inlet one-way valve is located at the inlet end of the flushing pipeline and is used to open or close the flow path of the medium liquid from outside the flushing channel into the flushing channel. The outlet one-way valve is located at the outlet end of the flushing pipeline and is used to open or close the flow path of the medium liquid from inside the flushing channel to outside the flushing channel;

[0011] Precisely because both one-way valves are in the form of one-way opening, therefore, it can prevent urine, blood streaks, blood clots, etc. in the bladder from entering the flushing channel and causing retention phenomena, improve the safety of the flushing operation, avoid contamination of the flushing channel by urine, blood streaks, blood clots, etc. in the bladder from the source, and reduce the infection risk. It can also prevent the flushing liquid from flowing back outside the flushing channel, thereby further reducing the infection risk and improving the flushing efficiency.

[0012] At the same time, the design of the two one-way valves on the flushing channel enables the medium liquid output by the flushing channel to always maintain a pressure greater than the opening threshold of the outlet one-way valve. Furthermore, it can ensure that the flushing liquid always maintains a certain pressure on the position to be flushed in the patient's bladder, that is, the flushing channel plays a certain role in maintaining the medium output pressure effect, can improve the flushing effect, reduce the operation difficulty of the staff during flushing, and improve the flushing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is one of the structural schematic diagrams of the indwelling drainage device of the present utility model;

[0014] Figure 2 is one of the structural schematic diagrams of the opening and closing unit of the present utility model;

[0015] Figure 3 is the second structural schematic diagram of the opening and closing unit of the present utility model;

[0016] Figure 4 is the third structural schematic diagram of the opening and closing unit of the present utility model;

[0017] Figure 5 is the second structural schematic diagram of the indwelling drainage device of the present utility model;

[0018] Figure 6 is for the present utility model Figure 5 is the partial enlarged structural schematic diagram at position B in;

[0019] Figure 7 is for the present utility model Figure 5 is the partial enlarged structural schematic diagram at position A in;

[0020] Figure 8 It is a schematic structural diagram of the flushing channel and check valve of the present utility model;

[0021] Figure 9 It is a schematic structural diagram of the control component of the present utility model;

[0022] Figure 10 It is the third schematic structural diagram of the indwelling drainage device of the present utility model.

[0023]

Description of the attached drawing reference numerals

[0024] 1: Outer tube;

[0025] 2: Drainage channel;

[0026] 3: Flushing channel;

[0027] 4: Inlet check valve;

[0028] 5: Outlet check valve;

[0029] 6: Opening and closing unit; 61: Head; 62: Tail; 63: Elastic member; 610: Drainage port; 620: Developer line;

[0030] 7: Loading lead;

[0031] 8: Control component; 81: Driving member; 82: Limiting member;

[0032] 9: Medication injection channel. Detailed implementation manners

[0033] In order to better explain the present utility model for easy understanding, the following will describe the present utility model in detail through specific implementation manners. Among them, the orientation nouns such as "upper" and "lower" mentioned in this article are Figure 1-10 referenced to the orientation of Figure 2 In this embodiment, "outer" is the direction away from the axis of the outer tube, and "inner" is the direction close to the axis of the outer tube.

[0034] Embodiment 1:

[0035] Referring to Figures 1-9 , the embodiment of the present utility model provides an indwelling drainage device suitable for urine drainage, including an outer tube 1 and a drainage channel 2 and a flushing channel 3 extending along the inside of the outer tube 1; it also includes an inlet check valve 4 provided at the inlet end of the flushing channel 3 and an outlet check valve 5 provided at the outlet end of the flushing channel 3; the inlet check valve 4 and the outlet check valve 5 can be opened unidirectionally along the flow direction of the medium when flushing the bladder through the flushing channel 3.

[0036] In this embodiment, the indwelling drainage device can be used to drain urine, that is, the indwelling drainage device can be inserted into the patient's bladder from the patient's urethra. The indwelling drainage device integrates a liquid discharge channel 2 and a flushing channel 3, and an inlet one-way valve 4 and an outlet one-way valve 5 are arranged at both ends of the flushing channel 3 to control the flow of the medium. The inlet one-way valve 4 is located at the inlet end of the flushing pipe 3 and is used to open or close the flow path of the medium liquid from outside the flushing channel 3 into the flushing channel 3. The outlet one-way valve 5 is located at the outlet end of the flushing pipe 3 and is used to open or close the flow path of the medium liquid from inside the flushing channel 3 to outside the flushing channel 3;

[0037] Precisely because both one-way valves are of the one-way opening form, therefore, it can prevent urine in the bladder, as well as blood streaks and blood clots, etc. from entering the flushing channel 3 and causing retention phenomena, improve the safety of the flushing operation, avoid contamination of the flushing channel 3 by urine, blood streaks and blood clots in the bladder from the source, and reduce the infection risk. It can also prevent the flushing liquid from flowing back into the flushing channel 3, thereby further reducing the infection risk and improving the flushing efficiency.

[0038] At the same time, the design of the two one-way valves on the flushing channel 3 enables the medium liquid output by the flushing channel 3 to always maintain a pressure greater than the opening threshold of the outlet one-way valve 5. Furthermore, it can ensure that the flushing liquid always maintains a certain pressure on the position to be flushed in the patient's bladder, that is, the flushing channel 3 plays a certain role in maintaining the output pressure of the medium, can improve the flushing effect, reduce the operation difficulty of the staff during flushing, and improve the flushing efficiency.

[0039] Specifically, the flushing channel 3 is used to inject a flushing liquid, such as normal saline, into the body to clean the drainage area and promote the healing of the wound site.

[0040] More specifically, the outer tube 1 wraps the liquid discharge channel 2 and the flushing channel 3 to ensure the smoothness of the outer wall of the indwelling drainage device, so that it can be inserted into the patient's urethra more easily and conveniently.

[0041] The inlet one-way valve 4 and the outlet one-way valve 5 can be set as pressure-opening valves.

[0042] Embodiment 2:

[0043] Reference Figure 10 In addition to having all the technical solutions of the above embodiment, the embodiment of the present utility model further has the following technical solutions:

[0044] The indwelling drainage device further includes a medicine injection channel 9 extending along the inside of the outer tube 1, and the outer wall of the medicine injection channel 9 is connected to the inner wall of the outer tube 1; it is used to inject medicine into the chamber to be drained of the patient.

[0045] In this embodiment, a technical solution of separating the drug from the flushing medium is adopted, that is, the drug will enter the patient's bladder through a separate channel. At the same time, the drug injection process and the flushing process will not interfere with each other, which can improve the working efficiency of these two processes and also improve the use effect of the indwelling drainage device. At the same time, the drug injection channel 9 is also wrapped by the outer tube 1 to ensure the smoothness of the outer wall of the indwelling drainage device, so that it can be inserted into the patient's urethra more easily and conveniently.

[0046] Specifically, the liquid discharge channel 2, the flushing channel 3 and the drug injection channel 9 can be channels integrated into one in the outer tube 1, or can be channels formed by structurally independent pipe walls, which can be flexibly selected by the staff.

[0047] Embodiment 3:

[0048] Referring to Figures 1-5 , in addition to having all the technical solutions of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0049] The indwelling drainage device further includes an opening and closing unit 6 connected to the head end of the outer tube 1. The opening and closing unit 6 forms a petal-like structure, and the opening and closing unit 6 can switch between a limited state of expanding outwards and an initial state of folding inwards.

[0050] The opening and closing unit 6 includes a head 61, a tail 62 and a plurality of elastic members 63. Each elastic member 63 connects the head 61 and the tail 62. The tail 62 is connected to the head end of the outer tube 1. A liquid discharge port 610 communicating with the liquid discharge channel 2 is formed between adjacent elastic members 63; wherein, when the head 61 approaches the tail 62, the elastic member 63 elastically deforms outwards to switch the opening and closing unit 6 to the limited state; when the head 61 moves away from the tail 62, the elastic member 63 resets inwards to switch the opening and closing unit 6 to the initial state; wherein, the opening and closing unit 6 is an integral structure, and the opening and closing unit 6 and the outer tube 1 are an integral structure; the liquid discharge port 610 extends to the top of the tail 62 to reduce the liquid discharge depth of the liquid discharge port 610.

[0051] The indwelling drainage device further includes a loading lead 7. One end of the loading lead 7 is directly or indirectly connected to the head 61 of the opening and closing unit 6 to control the distance between the head 61 and the tail 62.

[0052] The indwelling drainage device can be restricted in the bladder by the opening and closing unit 6. In this embodiment, the opening and closing unit 6 is formed into a petal shape that can be opened and closed. During the insertion or removal of the indwelling drainage device into the urethra, the head 61 is controlled to be away from the tail 62 by the loading lead 7, and the elastic member 63 is restored to the initial state, thereby reducing the cross-sectional dimension of the opening and closing unit 6 along the radial direction of the indwelling drainage device, thereby enabling the opening and closing unit 6 to slide in the urethra. After the indwelling drainage device is inserted into the bladder, the head 61 is controlled to be close to the tail 62 by the loading lead 7, so that the elastic member 63 expands outward, and the cross-sectional dimension of the opening and closing unit 6 along the radial direction of the indwelling drainage device is increased, so that it can play a limiting role and keep the indwelling drainage device in the bladder.

[0053] The utility model can save the steps of water and air injection of the traditional urinary catheter through the cooperation of the opening and closing unit 6 and the loading lead 7. It has high efficiency and is easier to use, reduces the difficulty of operation for personnel, saves manufacturing costs by reducing water and air injection consumables, and greatly saves unnecessary operation time.

[0054] Because the cystic cavity is omitted, there is no obstruction at the drainage port 610 near the lowest point of the bladder, thereby reducing the lowest drainage depth and solving the problem of more bladder drainage residue. After the opening and closing unit 6 is switched to the initial state, its exterior is smooth without wrinkles and protrusions, avoiding the problem of scratching tissues when taking out.

[0055] Channels are formed between adjacent elastic members 63 , and compared with the traditional liquid inlet method, the liquid inlet area is significantly enlarged, making the liquid discharge faster and smoother.

[0056] Specifically, the opening and closing unit 6 and the outer tube 1 can both be made of TPU material to ensure the consistency between the various components, and the affinity of the TPU material itself with the human body can also be used to improve the comfort of use of the indwelling drainage device.

[0057] The axis of the opening and closing unit 6 coincides with the axis of the outer tube 1; when the opening and closing unit 6 is switched to the limiting state, the distance between the side of the elastic member 63 that is away from each other and the axis of the outer tube 1 is greater than the inner diameter of the urethra to ensure that it can play a limiting role; when the opening and closing unit 6 is switched to the initial state, the distance between the side of the elastic member 63 that is away from each other and the axis of the outer tube 1 is less than the inner diameter of the urethra to ensure that the opening and closing unit 6 can be removed from the urethra.

[0058] The opening and closing unit 6 is an integral structure. Both the head 61 and the tail 62 are circular rings. The tail 62 and the outer tube 1 are an integral structure. The elastic member 63 is a petal-like structure that bends outward. A relatively large-sized liquid discharge port 610 is reserved between adjacent elastic members 63, which is conducive to liquid discharge and can also meet the requirement of discharging particulate matter, such as discharging lumps like blood clots and urinary calculi. The circular head 61 and tail 62 facilitate the arrangement of the elastic member 63 and facilitate the connection of other components to the head 61 and tail 62. For example, a guiding cone with a guiding function is connected to the head 61, and an indwelling drainage device is connected to the tail 62.

[0059] The outer tube 1 and the opening and closing unit 6 are integrated. The liquid discharge port 610 can be opened at the end of the outer tube 1, and then the side wall of the outer tube 1 at the corresponding position is shaped to obtain the opening and closing unit 6, thereby improving the integrity of the opening and closing unit 6 and the outer tube 1 and reducing the assembly and production costs.

[0060] At the same time, the liquid discharge port 610 extends to the top of the tail 62 to further reduce the liquid discharge depth of the liquid discharge port 610, thereby more thoroughly discharging the urine in the bladder.

[0061] In this embodiment, the loading lead 7 extends along the inside of the outer tube 1 to hide the loading lead 7, improve the structural compactness of the indwelling drainage device, and avoid scratching the patient's urethra by the loading lead 7.

[0062] Embodiment 4:

[0063] Refer to Figure 1 、 Figure 3 and Figure 4 In addition to having all the technical solutions of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0064] One or more elastic members 63 are provided with a developing line 620 that deforms following the elastic member 63 to identify the state of the opening and closing unit 6.

[0065] In this embodiment, a developing line 620 that deforms following the deformation is designed on the elastic member 63, which can cooperate with imaging equipment to observe the insertion position and depth in real time, as well as the opening degree of the opening and closing unit 6, making the overall drainage process more transparent and improving the operation convenience and safety.

[0066] The developing line 620 serves as an identifier, and through its visibility under X-ray or other imaging technologies, it shows the deformation of the elastic member 63 and the state of the opening and closing unit 6.

[0067] The developing line 620 is arranged outside each or some of the elastic members 63, or is injection-molded into the elastic member 63, ensuring that when the elastic member 63 deforms, the developing line 620 can accurately follow the deformation and display its state. Through the developing line 620, the operator can intuitively understand the state of the opening and closing unit 6, and thus perform corresponding operations and adjustments.

[0068] Utilizing the visibility of the developing line 620 under X-ray or other imaging technologies, the deformation of the elastic member 63 and the state of the opening and closing unit 6 can be clearly displayed. This design not only improves the reliability and operation efficiency of the device, but also reduces the risk of misoperation by the operator.

[0069] The developing line 620 can be a material that is injection-molded into the elastic member 63 and is visible under X-ray, such as barium sulfate and bismuth trioxide, etc., and the developing line 620 can be injection-molded into one elastic member 63, rather than each elastic member 63, to reduce costs.

[0070] Lubricating layers are provided on both the outer tube 1 and the outer surface of the opening and closing unit 6 to improve the smoothness when the drainage catheter is inserted into or withdrawn from the urethra, and at the same time, it also improves the comfort of the user.

[0071] The lubricating layer can be a polyvinylpyrrolidone layer, that is, a PVP layer, and is combined with the outer surface of the outer tube 1 and the opening and closing unit 6 in the form of infiltration + photocuring.

[0072] Embodiment 5:

[0073] Referring to Figure 1 、 Figure 5 and Figure 9 In addition to having all the technical solutions of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0074] The indwelling drainage device further includes a control assembly 8. The driving end of the control assembly 8 is connected to the other end of the loading lead 7 to control the sliding of the loading lead 7 along the first straight line direction, and further drive the opening and closing unit 6 to switch between the limited state and the initial state through the loading lead 7. Among them, the first straight line direction is parallel or coincides with the axial direction of the outer tube 1.

[0075] The loading lead 7 is rigid along the axial direction of the loading lead 7.

[0076] The control assembly 8 includes a driving member 81 and a limiting member 82. The driving end of the driving member 81 is connected to the loading lead 7, and the limiting member 82 is used to limit the position where the driving member 81 drives the loading lead 7 to slide along the indwelling drainage device, so that the loading lead 7 can control the distance between the head 61 and the tail 62, and further control the opening and closing size of the drainage channel 2.

[0077] The loading lead 7 is made of a rigid material along the axis direction of the loading lead 7, and the loading lead 7 can also directly or indirectly push the head 61 to move the head 61 away from the tail 62.

[0078] In this embodiment, the opening and closing unit 6 can not only switch to the initial state by relying on the elastic self-limiting state of the elastic member 63 itself, but also can be pushed by the loading lead 7 to switch the opening and closing unit 6 from the self-limiting state to the initial state, such as pushing the guiding cone, thereby improving the convenience and reliability of the opening and closing unit 6 switching to the initial state, ensuring that during the process of inserting the indwelling drainage device into the urethra or pulling it out from the urethra, the elastic member 63 does not generate an outward bulge, so as to improve the use safety and comfort.

[0079] In this embodiment, the control component 8 is used to control the sliding of the loading lead 7 to facilitate the operation convenience of the staff.

[0080] Moreover, the control component 8 includes a limiting member 82, and the limiting member 82 can limit the sliding position of the loading lead 7 within the indwelling drainage device, so that the distance between the head 61 and the tail 62 is controllable. It is precisely because the distance between the head 61 and the tail 62 is controllable that the size of the liquid discharge channel 2 can be adjusted. When the urinary catheterization device has a filtration requirement, the position of the loading lead 7 can be adjusted, and then the size of the liquid discharge channel 2 can be adjusted to an appropriate size so that it can play a role in filtering large particles to avoid blockage of the indwelling drainage device by large particles; when there is no filtration requirement, the size of the liquid discharge channel 2 can be opened to the maximum to improve the urination efficiency; at the same time, the limiting member 82 itself is outside the overall control component 8.

[0081] Since the position of the limiting member 82 of the control component 8 can directly reflect the state of the opening and closing unit 6, the opening and closing situation of the opening and closing unit 6 can be obtained by observing the position of the limiting member 82.

[0082] Embodiment 6:

[0083] An embodiment of the present utility model provides a urinary catheterization device, including the indwelling drainage device in any of the above embodiments, and the opening and closing unit 6 is adapted to limit the indwelling drainage device from slipping out in the bladder. The urinary catheterization device further includes a urine bag communicated with the liquid discharge channel 2 for collecting urine.

[0084] It can be understood that in the above Embodiments 1-6, except for the parts in conflict, they can be freely combined to form other embodiments of the present utility model.

[0085] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0086] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium; it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0087] In the present utility model, unless otherwise clearly specified and defined, when the first feature is "on" or "under" the second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when the first feature is "above", "over" and "on top of" the second feature, it may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. When the first feature is "under", "beneath" and "underneath" the second feature, it may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0088] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to these process, article, or apparatus / device.

[0089] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easily understood by those skilled in the art that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. An indwelling drainage device suitable for urine drainage, characterized in that: It comprises an outer tube (1) and a drainage channel (2) and a flushing channel (3) extending inside the outer tube (1); It also includes an inlet check valve (4) arranged at the inlet end of the flushing channel (3) and an outlet check valve (5) arranged at the outlet end of the flushing channel (3); The inlet one-way valve (4) and the outlet one-way valve (5) can be opened unidirectionally along the flow direction of the medium when the bladder is flushed through the flushing channel (3).

2. The indwelling drainage device according to claim 1, characterized in that: The indwelling drainage device further comprises a drug injection channel (9) extending along the interior of the outer tube (1) and used for injecting drugs into the patient's cavity to be drained.

3. The indwelling drainage device according to claim 1, characterized in that: The indwelling drainage device further comprises an opening and closing unit (6) connected to the head end of the outer tube (1), the opening and closing unit (6) forming a petal-shaped structure, and the opening and closing unit (6) can switch between an outwardly extended limiting state and an inwardly contracted initial state; The opening and closing unit (6) comprises a head portion (61), a tail portion (62) and a plurality of elastic members (63), each of the elastic members (63) being connected to the head portion (61) and the tail portion (62), the tail portion (62) being connected to the head end of the outer tube (1), and a liquid discharge port (610) communicating with the liquid discharge channel (2) being formed between adjacent elastic members (63); When the head (61) approaches the tail (62), the elastic member (63) elastically deforms outwards so that the opening and closing unit (6) switches to the limited state; when the head (61) moves away from the tail (62), the elastic member (63) returns inwards so that the opening and closing unit (6) switches to the initial state.

4. The indwelling drainage device according to claim 3, characterized in that: The opening and closing unit (6) is an integrated structure, and the opening and closing unit (6) and the outer tube (1) are an integrated structure; A lubricating layer is provided on the outer surfaces of the outer tube (1) and the opening and closing unit (6).

5. The indwelling drainage device according to claim 4, characterized in that: The liquid discharge port (610) extends to the top end of the tail portion (62) to reduce the liquid discharge depth of the liquid discharge port (610).

6. The indwelling drainage device according to any one of claims 3 to 5, characterized in that: One or more of the elastic members (63) are provided with a display line (620) that follows the deformation of the elastic member (63) to indicate the state of the opening and closing unit (6).

7. The indwelling drainage device according to claim 6, characterized in that: The indwelling drainage device further comprises a loading lead (7), one end of which is directly or indirectly connected to the head (61) of the opening and closing unit (6) to adjust the distance between the head (61) and the tail (62).

8. The indwelling drainage device according to claim 7, characterized in that: The indwelling drainage device further comprises a control component (8), wherein a driving end of the control component (8) is connected to the other end of the loading lead (7) to control the loading lead (7) to slide along a first straight line direction, thereby driving the opening and closing unit (6) to switch between the limit state and the initial state through the loading lead (7); Wherein, the direction of the first straight line is parallel to or coincides with the axial direction of the outer tube (1).

9. The indwelling drainage device according to claim 8, characterized in that: The loading lead (7) is rigid along the axial direction of the loading lead (7), so that the loading lead (7) can push and pull the head (61).

10. The indwelling drainage device according to claim 9, characterized in that: The control assembly (8) comprises a driving member (81) and a limiting member (82), wherein the driving end of the driving member (81) is connected to the loading lead (7), and the limiting member (82) is used to limit the position at which the driving member (81) drives the loading lead (7) to slide along the indwelling drainage device, so that the loading lead (7) can adjust the spacing between the head (61) and the tail (62), thereby controlling the opening and closing size of the drainage channel (2).

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