Drainage catheter and urinary catheterization device

Abstract

The utility model relates to a drainage catheter and a urethral catheterization device, which comprise a catheter assembly, an opening and closing unit and a loading lead, and a drainage channel is formed in the catheter assembly; the opening and closing unit comprises a head part, a tail part and an elastic part for connecting the head part and the tail part, the tail part is connected to one end of the catheter assembly, and when the head part is close to the tail part, the elastic part expands outwards to enable the opening and closing unit to be switched to a limiting state. Therefore, the steps of water injection and gas injection of a traditional catheter can be omitted, the operation convenience of the drainage catheter is higher, the operation difficulty of personnel is reduced, the manufacturing cost is saved by reducing water injection and gas injection consumables, and unnecessary operation time is greatly saved. Due to the fact that the bladder cavity is omitted, the position, close to the lowest point of the bladder, of the liquid drainage opening cannot be blocked any more, the lowest liquid drainage depth is reduced, and the problem that more liquid drainage residues exist in the bladder is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical drainage devices, in particular to a drainage catheter and a urinary catheter device. Background Art

[0002] At present, most of the urinary catheters on the market use the method of injecting water or gas into the balloon cavity to limit or jam in the bladder. Injecting water or gas takes a long time and is not easy to master. At the same time, the balloon cavity blocks the urethral orifice, resulting in urine retention. After draining water or gas, the balloon cavity cannot return to its original smooth surface. After shrinking like a balloon, there are a large number of wrinkles, which are likely to cause tissue scratches when removed. The existence of the balloon cavity will also limit the drainage depth of the urinary catheter, resulting in more urine retention in the bladder. Content of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a drainage catheter and a urinary catheter device, which solve the technical problems existing in the prior art that it takes a long time and is not easy to master to inject water or gas into the balloon cavity of the urinary catheter, and at the same time, it is easy to cause urine retention around the water injection and inflation balloon cavity, and after draining water and gas, the balloon cavity cannot return to its original smooth surface, and it is easy to cause tissue scratches when removed.

[0005] (2) Technical Solutions

[0006] In order to achieve the above purpose, the main technical solutions adopted by the utility model include:

[0007] In the first aspect, the utility model provides a drainage catheter, which includes a catheter assembly, an opening and closing unit, and a loading lead wire. A drainage channel is formed in the catheter assembly; the opening and closing unit includes a head, a tail, and a plurality of elastic members connecting the head and the tail. The tail is connected to one end of the catheter assembly, and a drainage port communicating with the drainage channel is formed between adjacent elastic members; the loading lead wire extends along the length direction of the catheter assembly, and one end of the loading lead wire is directly or indirectly connected to the head to control the distance between the head and the tail; wherein, when the head approaches the tail, the elastic members expand outwards to switch the opening and closing unit to the limiting state; when the head moves away from the tail, the elastic members gather together to switch the opening and closing unit to the initial gathering state.

[0008] In the second aspect, the utility model provides a urinary catheter device, which includes the drainage catheter in the above technical solution, and the opening and closing unit is adapted to limit the drainage catheter from slipping out in the bladder.

[0009] (3) Beneficial Effects

[0010] The beneficial effects of the utility model are as follows: the drainage catheter of the utility model can be used for urine drainage, the opening and closing unit is formed into a petal shape that can be opened and closed, and the state is switched by controlling the loading lead wire. In the process of inserting or removing the catheter assembly from the urethra, the loading lead wire controls the head to be away from the tail, so that the elastic member is stretched, and the cross-sectional size of the opening and closing unit along the radial direction of the catheter assembly is reduced, so that the opening and closing unit can slide in the urethra. After the catheter assembly is inserted into the bladder, the loading lead wire controls the head to be close to the tail, so that the elastic member expands outward, and the cross-sectional size of the opening and closing unit along the radial direction of the catheter assembly is increased, so that it can play a limiting role and keep the catheter assembly in the bladder.

[0011] The utility model can save the steps of water and air injection of traditional urinary catheters through the cooperation of the opening and closing unit and the loading lead, has high efficiency and is simpler to use, reduces the difficulty of human operation, saves manufacturing costs by reducing water and air injection consumables, and greatly saves unnecessary operation time.

[0012] Because the cyst cavity is omitted, there is no obstruction at the drainage port near the lowest point of the bladder, thus reducing the lowest drainage depth and solving the problem of excessive bladder drainage residue. After the opening and closing unit is switched to the initial gathering state, its exterior is smooth without wrinkles and protrusions, avoiding the problem of scratching tissues when removing it.

[0013] Channels are formed between adjacent elastic members. Compared with the traditional liquid inlet method, the liquid inlet area is significantly enlarged, making the liquid discharge faster and smoother.

[0014] Since the distance between the head and tail of the opening and closing unit is controllable, the size of the drainage port can be adjusted. When there is a filtering requirement for the urinary catheterization device, the size of the drainage port can be adjusted to an appropriate size by adjusting the position of the loading lead, so that it can filter large particles to avoid large particles clogging the catheter assembly; when there is no filtering requirement, the size of the drainage port can be opened to the maximum to improve the urination efficiency, thereby greatly enriching the function of the drainage catheter and improving the flexibility of use of the drainage catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a drainage catheter in the prior art;

[0016] Figure 2 This is one of the structural schematic diagrams of the drainage catheter of the utility model;

[0017] Figure 3 This is the second structural schematic diagram of the drainage catheter of the utility model;

[0018] Figure 4 This is the third structural schematic diagram of the drainage catheter of the utility model;

[0019] Figure 5 This is the fourth schematic structural view of the drainage catheter of the present utility model;

[0020] Figure 6 This is the partially enlarged schematic structural view at the control component of the present utility model;

[0021] Figure 7 This is the schematic structural view of the control component of the present utility model.

[0022]

Explanation of the reference numerals

[0023] 1: Catheter assembly;

[0024] 2: Opening and closing unit; 21: Head; 22: Tail; 23: Elastic member; 200: Drainage port;

[0025] 3: Loading lead;

[0026] 4: Guide cone;

[0027] 5: Control component; 51: Driving member: 52: Locking structure;

[0028] 6: Marking line. Detailed implementation manners

[0029] In order to better explain the present utility model for easy understanding, the following combines the attached Figure 1-7 , and through specific implementation manners, the present utility model is described in detail. Among them, the orientation terms such as "upper" and "lower" mentioned in this article are based on Figure 2 the orientation of, and in this embodiment, "outer" is the direction away from the axis of the catheter assembly 1, and "inner" is the direction close to the axis of the catheter assembly.

[0030] Embodiment 1:

[0031] Referring to Figures 1-5 , the embodiment of the present utility model provides a drainage catheter, including a catheter assembly 1, an opening and closing unit 2 and a loading lead 3. A drainage channel is formed inside the catheter assembly 1; the opening and closing unit 2 includes a head 21, a tail 22 and a plurality of elastic members 23 connecting the head 21 and the tail 22. The tail 22 is connected to one end of the catheter assembly 1, and a drainage port 200 communicating with the drainage channel is formed between adjacent elastic members 23; the loading lead 3 extends along the length direction of the catheter assembly 1, and one end of the loading lead 3 is directly or indirectly connected to the head 21 to control the distance between the head 21 and the tail 22, thereby controlling the opening degree of the drainage port 200; wherein, when the head 21 approaches the tail 22, the elastic members 23 expand outwards to switch the opening and closing unit 2 to the limiting state; when the head 21 moves away from the tail 22, the elastic members 23 gather outwards to switch the opening and closing unit 2 to the initial gathering state.

[0032] In this embodiment, the drainage catheter can be used for urine drainage. The opening and closing unit 2 is formed into a petal shape that can open and close, and its state is switched by controlling the loading lead 3. During the process of inserting or detaching the catheter assembly 1 from the urethra, the head 21 is controlled by the loading lead 3 to move away from the tail 22, so that the elastic member 23 is unfolded, reducing the cross-sectional size of the opening and closing unit in the radial direction of the catheter assembly 1, and thus enabling the opening and closing unit to slide within the urethra. After the catheter assembly 1 is inserted into the bladder, the head 21 is controlled by the loading lead 3 to approach the tail 22, so that the elastic member 23 expands outward, increasing the cross-sectional size of the opening and closing unit in the radial direction of the catheter assembly 1, enabling it to play a limiting role and leaving the catheter assembly 1 in the bladder.

[0033] Through the cooperation of the opening and closing unit 2 and the loading lead 3, the present utility model can eliminate the steps of injecting water and gas in traditional catheters, with high usage efficiency, simpler operation, reduced difficulty of personnel operation, reduced manufacturing cost by reducing water and gas injection consumables, and also greatly saving unnecessary operation time.

[0034] Precisely because the bladder cavity is eliminated, there will no longer be any blockage at the drainage port position near the lowest point of the bladder, thus reducing the lowest drainage depth and solving the problem of more residual drainage in the bladder. After the opening and closing unit 2 switches to the initial converged state, its exterior is smooth, without wrinkles and protrusions, avoiding the problem of scratching tissues during removal.

[0035] Channels are formed between adjacent elastic members 23. Compared with the traditional liquid inlet mode, the liquid inlet area is significantly enlarged, making the drainage faster and smoother.

[0036] Specifically, both the opening and closing unit 2 and the catheter assembly 1 can be made of TPU material to ensure the consistency between components and also utilize the affinity of the TPU material itself with the human body to improve the comfort of using this drainage catheter.

[0037] The axis of the opening and closing unit 2 coincides with the axis of the catheter assembly 1; when the opening and closing unit 2 switches to the limiting state, the distance between the mutually remote sides of the elastic members 23 and the catheter axis is greater than the inner diameter of the infusion tube to be drained, so as to ensure that it can play a limiting role; when the opening and closing unit 2 switches to the initial converged state, the distance between the mutually remote sides of the elastic members 23 and the catheter axis is less than the inner diameter of the infusion tube to be drained, so as to ensure that the opening and closing unit 2 can be withdrawn from the infusion tube. Specifically, the infusion tube is the urethra.

[0038] The opening and closing unit 2 is an integral structure. Both the head 21 and the tail 22 are circular rings. The tail 22 and the catheter assembly 1 are an integral structure. The elastic member 23 is a petal-like structure that bends outward. A relatively large-sized liquid discharge port 200 is reserved between adjacent elastic members 23, 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 21 and tail 22 facilitate the arrangement of the elastic member 23 and can facilitate the connection of other components to the head 21 and tail 22. For example, a guiding cone 4 is connected to the head 21 and the catheter assembly 1 is connected to the tail 22.

[0039] The catheter assembly 1 and the opening and closing unit 2 are integrated. By opening a liquid discharge port 200 at one end of the catheter assembly 1 and then shaping the side wall of the catheter assembly 1 at the corresponding position, the opening and closing unit 2 can be obtained, thereby improving the integrity of the opening and closing unit 2 and the catheter assembly 1 and reducing the assembly and production costs.

[0040] At the same time, the liquid discharge port 200 extends to the top of the tail 22 to further reduce the liquid discharge depth of the liquid discharge port 200 and more thoroughly discharge the urine in the bladder.

[0041] In this embodiment, the loading lead 3 extends along the inside of the catheter assembly 1 to hide the loading lead 3, improve the structural compactness of the drainage catheter, and also avoid scratching the patient's urethra by the loading lead 3.

[0042] Since the distance between the head 21 and the tail 22 of the opening and closing unit 2 is controllable, the size of the liquid discharge port 200 can be adjusted. When the urinary catheter device has a filtering requirement, the position of the loading lead 3 can be adjusted to adjust the size of the liquid discharge port 200 to an appropriate size so that it can play a role in filtering large particulate matter and avoid blockage of the catheter assembly 1 by large particulate matter. When there is no filtering requirement, the size of the liquid discharge port 200 can be opened to the maximum to improve the urination efficiency, thereby greatly enriching the functions of the drainage catheter and improving the flexibility of use of the drainage catheter.

[0043] Lubricating layers are provided on the outer surfaces of both the catheter assembly 1 and the opening and closing unit 2 to improve the smoothness when the drainage catheter is inserted or removed from the urethra and also improve the comfort of the user.

[0044] The lubricating layer can be a polyvinylpyrrolidone layer, that is, a PVP layer, which is combined on the outer surfaces of the catheter assembly 1 and the opening and closing unit 2 in the form of infiltration + photocuring.

[0045] Embodiment 2:

[0046] Refer to Figures 2-5 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:

[0047] The drainage catheter further includes a guide cone 4 , which includes a stepped connection portion connected to the head 21 to achieve a smooth transition between the head 21 and the guide cone 4 , and one end of the loading lead 3 is connected to the guide cone 4 .

[0048] In this embodiment, the guide cone 4 is connected to the head 21 to provide guidance for the process of inserting the drainage catheter into the urethra, thereby improving the convenience of the insertion process. At the same time, the stepped connection portion can ensure that the guide cone 4 does not produce a bulge after being connected to the head 21, so that the connection position maintains a smooth transition, thereby further improving the convenience and comfort of the insertion process. The loading lead 3 is connected to the guide cone 4, and the loading lead 3 indirectly controls the head 21 by controlling the guide cone 4.

[0049] Embodiment 3:

[0050] Reference Figures 2-5 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0051] The elastic member 23 remains inwardly retracted under normal conditions. When the pulling force of the loading lead 3 on the head 21 is less than the resetting force of the elastic member 23 to retract inwardly, the elasticity of the elastic member 23 causes the head 21 to move away from the tail 22, so that the opening and closing unit 2 switches to the initial gathered state.

[0052] The elastic member 23 keeps the opening and closing unit in the initial gathered state under normal conditions; the elastic member 23 relies on its own elastic force to switch the opening and closing unit 2 from the limited state to the initial gathered state, thereby ensuring that the elastic member 23 does not bulge outward during the process of inserting the drainage catheter into the urethra or removing it from the urethra, so as to improve the safety and comfort of the use of the drainage catheter.

[0053] When the opening and closing unit 2 switches to the initial gathering state, the elastic member 23 is recessed toward the axial direction of the catheter assembly 1, or is parallel to the axis of the catheter assembly 1, further ensuring that when the opening and closing unit 2 is in the initial gathering state, there is no outward protrusion of the elastic member 23, thereby further improving the safety and comfort of the drainage catheter.

[0054] Embodiment 4:

[0055] Reference Figures 2-5 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present utility model further have the following technical solutions:

[0056] The loading lead 3 is rigid along the axial direction of the loading lead 3 , and the loading lead 3 can also directly or indirectly push the head portion 21 to move the head portion 21 away from the tail portion 22 .

[0057] In this embodiment, the opening and closing unit 2 can not only switch from the elastic self-limiting state to the initial gathering state by relying on the elasticity of the elastic member 23 itself, but also can be pushed by the loading lead 3 to switch the opening and closing unit 2 from the self-limiting state to the initial gathering state. For example, by pushing the guiding cone 4, thereby improving the convenience and reliability of the opening and closing unit 2 to switch to the initial gathering state, ensuring that during the process of inserting or pulling out the drainage catheter from the urethra, the elastic member 23 does not produce an outward bulge, so as to improve the safety and comfort of use.

[0058] Embodiment 5:

[0059] Referring to Figures 5-7 , in addition to having all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0060] The drainage catheter further includes a control assembly 5 connected to the other end of the catheter assembly 1. The driving end of the control assembly 5 is connected to the other end of the loading lead 3 to control the sliding of the loading lead 3.

[0061] The control assembly 5 includes a driving member 51 and a locking structure 52. The driving end of the driving member 51 is connected to the loading lead 3. The locking structure 52 is used to limit the position of the driving member 51 driving the loading lead 3 to slide along the catheter assembly 1, so that the loading lead 3 can control the distance between the head 21 and the tail 22, and further control the opening and closing size of the drainage port 200.

[0062] The locking structure 52 extends outside the sleeve 53 to display the relative position change of the locking structure 5 and the catheter assembly 1, and further reflects the state of the opening and closing unit 2 and the opening degree of the drainage port 200.

[0063] In this embodiment, the control assembly 5 is used to control the sliding of the loading lead 3 to facilitate the operation convenience of the staff.

[0064] Since the position of the loading lead 3 will directly reflect the state of the opening and closing unit 2, and the position of the loading lead 3 will be reflected on the control assembly 5, therefore, by observing the position of the locking structure 52 in the control assembly 5, the opening and closing condition of the opening and closing unit 2 can be obtained, and further the opening degree of the drainage port 200 can be obtained.

[0065] Therefore, by observing the position of the loading lead 3, the opening and closing condition of the opening and closing unit 2 can be obtained.

[0066] The drainage catheter further includes a developer wire 6 provided on the elastic member 23 to cooperate with the imaging device to observe the state of the opening and closing unit 2 and the opening degree of the drainage port 200 in real time.

[0067] The state of the opening and closing unit 2 inside the body can be observed by the cooperation of the imaging wire 6 and the imaging device; outside the body, the position shown by the control component 5 can be directly observed to judge the state of the opening and closing unit 2; therefore, the staff can more intuitively, specifically and accurately obtain the specific opening and closing conditions of the opening and closing unit 2 and the specific opening degree of the opening and closing unit 2, greatly improving the use safety and flexibility of the drainage catheter. The reliability of the drainage catheter is also improved.

[0068] The imaging wire 6 can be a material that is injection-molded into the elastic member 23 of the opening and closing unit 2 and is visible under X-ray, such as barium sulfate and bismuth trioxide, etc., and the imaging wire 6 can be injection-molded into one elastic member 23, rather than each elastic member 23, to reduce costs.

[0069] Moreover, the control component 5 includes a locking structure 52. The locking structure 52 extends outside the sleeve 53. The locking structure 52 can limit the sliding position of the loading lead 3 within the catheter assembly 1, making the distance between the head 21 and the tail 22 controllable. It is precisely because the distance between the head 21 and the tail 22 is controllable that the size of the drainage port 200 can be adjusted. When the urinary catheter device has a filtering requirement, the position of the loading lead 3 can be adjusted, and then the size of the drainage port 200 can be adjusted to an appropriate size so that it can play a role in filtering large particles to avoid blockage of the catheter assembly 1 by large particles; when there is no filtering requirement, the size of the drainage port 200 can be opened to the maximum to improve the urination efficiency.

[0070] Specifically, the control component 5 further includes a sleeve 53 and a telescopic tube. The sleeve 53 is supported at the end of the catheter assembly 1;

[0071] The driving member 51 is set as an adjustment tube. The sleeve 53 is connected to the tail end of the catheter assembly 1; the adjustment tube is directly or indirectly slidably connected to the sleeve 53 to move along the axis of the sleeve 53. The loading lead 3 is connected to the adjustment tube; the telescopic tube connects the sleeve 53 and the adjustment tube, and the telescopic tube communicates with the catheter assembly 1; one end of the locking structure 52 can be snap-connected to the sleeve 53, and the locking structure 52 is used to establish and limit the sliding relationship between the adjustment tube and the sleeve 53.

[0072] The inner wall of the sleeve 53 and the outer wall of the adjustment tube maintain a predetermined distance to ensure that the adjustment tube is not interfered by the sleeve 53 when it slides. The adjustment tube includes a body and a convex ring connected to the body; a sliding groove is provided on the sleeve 53; the locking structure 52 includes a slider and a buckle connected to each other: the slider penetrates through the sliding groove and is slidably connected to the sliding groove, and the buckle is buckled with the convex ring to be linked with the convex ring; the buckle includes a locking portion, and a card slot matching the locking portion is included on the outer wall of the sleeve 53, and the locking portion is normally kept buckled with the card slot to realize the position limitation of the buckle in the radial direction relative to the sleeve 53; two claw portions are formed on one side of the slider close to the convex ring, and the two claw portions can elastically approach each other to pass through the sliding groove; the two claw portions are normally kept in an open state to limit the slider on the sleeve 53.

[0073] The card slots are provided in multiple numbers. When the locking portion cooperates with different card slots, it corresponds to different opening degrees of the opening and closing unit 2.

[0074] Embodiment 6:

[0075] An embodiment of the present utility model provides a urinary catheterization device, which includes the drainage catheter in any of the above embodiments, and the opening and closing unit 2 is adapted to limit the drainage catheter from slipping out in the bladder. The urinary catheterization device further includes a urine bag communicated with the inner cavity of the catheter assembly 1 for collecting urine.

[0076] It can be understood that, for the above Embodiments 1-6, except for the conflicting parts, they can be freely combined to form other embodiments of the present utility model.

[0077] 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 understood 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" means two or more unless otherwise specifically defined.

[0078] In the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two components or the interaction relationship between two components. 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.

[0079] In the present utility model, unless otherwise clearly specified and defined, a first feature being "on" or "under" a second feature may mean 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, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0080] 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 further includes elements inherent to these process, article or apparatus / device.

[0081] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand 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 all fall within the protection scope of the present utility model.

Claims

1. A drainage catheter, characterized in that: include: A catheter assembly (1), wherein a drainage channel is formed in the catheter assembly (1); An opening and closing unit (2) comprises a head (21), a tail (22) and a plurality of elastic members (23), each of the elastic members (23) being connected to the head (21) and the tail (22), the tail (22) being connected to one end of the conduit assembly (1), and a liquid discharge port (200) communicating with the liquid discharge channel being formed between adjacent elastic members (23); A loading lead (3) extends along the length direction of the catheter assembly (1), and one end of the loading lead (3) is directly or indirectly connected to the head (21) to control the distance between the head (21) and the tail (22), thereby controlling the opening of the liquid discharge port (200); When the head (21) approaches the tail (22), the elastic member (23) expands outwards so that the opening and closing unit (2) switches to a limited position; when the head (21) moves away from the tail (22), the elastic member (23) resets so that the opening and closing unit (2) switches to an initial gathered position.

2. The drainage catheter according to claim 1, characterized in that: The elastic member (23) remains retracted inwardly in a normal state, and when the pulling force of the loading lead (3) on the head (21) is smaller than the resetting force of the elastic member (23) to retract inwardly, the elastic member (23) pulls the head (21) away from the tail (22), so that the opening and closing unit (2) switches to the initial gathered state.

3. The drainage catheter according to claim 2, characterized in that: When the opening and closing unit (2) is switched to the initial gathering state, the elastic member (23) is recessed in the direction of the axis of the catheter assembly (1), or is parallel to the axis of the catheter assembly (1).

4. The drainage catheter according to claim 3, characterized in that: The loading lead (3) is rigid along the axial direction of the loading lead (3), so that the loading lead (3) can also directly or indirectly push the head (21) to move the head (21) away from the tail (22).

5. The drainage catheter according to claim 4, characterized in that: The opening and closing unit (2) is an integrated structure, and the head (21) and the tail (22) are both in a circular ring shape; The tail portion (22) and the catheter assembly (1) are an integral structure; A lubricating layer is provided on the outer surfaces of the catheter assembly (1) and the opening and closing unit (2).

6. The drainage catheter according to claim 5, characterized in that: The liquid discharge port (200) extends to the top end of the tail portion (22).

7. The drainage catheter according to claim 5, characterized in that: The drainage catheter further comprises a guide cone (4), wherein the guide cone (4) comprises a stepped connection portion connected to the head (21) so as to achieve a smooth transition between the head (21) and the guide cone (4); one end of the loading lead (3) is connected to the guide cone (4).

8. The drainage catheter according to any one of claims 1 to 7, characterized in that: The drainage catheter further comprises a control component (5) connected to the other end of the catheter assembly (1), and a driving end of the control component (5) is connected to the other end of the loading lead (3) to control the movement of the loading lead (3); The drainage catheter further comprises a developing line (6) arranged on the elastic member (23) so as to cooperate with a developing device to observe the state of the opening and closing unit (2) and the opening degree of the drainage port (200) in real time.

9. The drainage catheter according to claim 8, characterized in that: The control assembly (5) comprises a driving member (51), a locking structure (52) and a sleeve (53); the sleeve (53) is supported at the end of the catheter assembly (1); the driving member (51) and the sleeve (53) are slidably connected along the axis of the catheter assembly (1); the driving member (51) is connected to the loading lead (3); the locking structure (52) is connected to the driving member (51); and one end of the locking structure (52) can be engaged with the sleeve (53) to limit the position of the driving member (51) driving the loading lead (3) to slide along the catheter assembly (1); the locking structure (52) extends to the outside of the sleeve (53); The locking structure (52) extends outside the sleeve (53) to display the relative position change between the locking structure (52) and the catheter assembly (1), thereby reflecting the state of the opening and closing unit (2) and the opening degree of the liquid discharge port (200).

10. A urinary catheterization device, characterized in that: The invention comprises the drainage catheter as claimed in any one of claims 1 to 9, wherein the opening and closing unit (2) is suitable for limiting the drainage catheter from coming out in the bladder.

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