Catheterization system

Abstract

The application discloses a urinary catheterization system, which comprises a urinary catheter, a urine collecting container and a connecting catheter connecting the urinary catheter and the urine collecting container, the connecting catheter comprises a first pipeline and a second pipeline, a siphon is arranged between the first pipeline and the second pipeline, the siphon comprises a shell A and a siphon pipe, the upper end of the shell A is provided with a liquid inlet A, the liquid inlet A is connected with the urinary catheter through the first pipeline, the siphon pipe comprises an upper bend pipe and a liquid inlet pipe, one end of the liquid inlet pipe is arranged in the inner cavity of the shell A, and the other end of the liquid inlet pipe is connected with the liquid inlet of the upper bend pipe, the liquid flowing into the inner cavity of the shell A from the liquid inlet A enters the upper bend pipe from the liquid inlet pipe, and then flows out from the liquid outlet of the upper bend pipe, and finally flows into the urine collecting container through the second pipeline, the urinary catheterization system controls the discharge of urine in the bladder through the siphon, the discharge of urine is related to the pressure in the bladder, the circulation process is consistent with the normal physiological urination of human beings, and the adverse effects caused by artificial control of urinary catheterization or continuous urinary catheterization on the bladder are avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a urinary catheterization system. Background Art

[0002] Catheterization is a method of inserting a catheter from the urethra into the bladder to urinate. It is a routine clinical operation. Clinically, patients with urinary diseases and acute urinary retention often need catheterization. Sometimes, patients with non-urinary diseases before and after large-scale surgery also need catheterization.

[0003] Currently, the main methods of urinary catheterization include continuous catheterization (indwelling catheter), intermittent catheterization (indwelling catheter), and intermittent catheterization (non-indwelling catheter). Continuous catheterization (indwelling catheter) involves leaving the catheter in place, continuously draining urine from the bladder. The catheter must be replaced regularly or removed when the patient's condition permits. The difference between intermittent catheterization (indwelling catheter) and continuous catheterization (indwelling catheter) is that the catheter is manually switched on and off at regular intervals. Intermittent catheterization (non-indwelling catheter) involves inserting the catheter into the bladder at regular intervals for a single catheterization, which is then removed once the bladder is empty.

[0004] During continuous catheterization, urine in the bladder is constantly draining from the body, keeping the bladder empty. During this process, the bladder curls up. If this continues for too long, it can lead to significant bladder contracture, making it unable to store urine. This causes the patient to urinate frequently, making it difficult to retain a catheter or replace a fistula. Furthermore, this disrupts the normal cyclical urinary physiology of bladder filling and emptying, leading to disturbances in the nervous system responsible for the urge to urinate. For a period of time after catheterization is removed, patients often experience urinary incontinence and other symptoms due to disturbances in the urinary nervous system. Therefore, urination must be performed at regular intervals to maintain bladder capacity and avoid bladder contracture and disturbances in the urinary nervous system. However, intermittent catheterization, which involves manually controlling the catheterization system's circuitry, can address bladder contracture and disturbances in the urinary nervous system. However, if the patient is unable to operate the urinary system or is unassisted, urine leakage or bladder damage may occur.

[0005] Currently used urinary catheterization devices typically consist of a urinary catheter and a urine bag. One end of the catheter is inserted into the bladder through the urethra, and the other end is connected to the urine bag (or urine bottle) via a connecting catheter. A clip is provided on the connecting catheter to clamp the catheter, controlling the opening of the catheter and regulating the urine flow rate. The clip has clamping gaps of varying widths. When the connecting catheter is positioned toward the larger end of the clamping gap, it remains unobstructed. Moving from the larger end to the smaller end, the connecting catheter deforms until it adheres to the inner wall, sealing it. Using a clip to adjust the opening and closing of the urinary catheterization device requires manual control and fails to establish a connection with the user's urination physiology. Both excessive and infrequent urination can adversely affect the bladder and impair bladder function. Summary of the Invention

[0006] The present invention aims to address the existing inability to automatically achieve normal cyclical urinary physiology of bladder filling and emptying. The present invention provides a urinary catheterization system that can be linked to the user's urination physiology, making catheterization similar to normal urination and avoiding the adverse effects of manual control on the bladder.

[0007] In order to achieve the above objectives, the technical solutions adopted in this application are:

[0008] A urinary catheterization system includes a urinary catheter, a urine collection container, and a connecting catheter connecting the urinary catheter and the urine collection container. The connecting catheter includes a first pipeline and a second pipeline. A siphon is provided between the first pipeline and the second pipeline. The siphon includes a shell A and a siphon tube. A liquid inlet A is provided at the upper end of the shell A. The liquid inlet A is connected to the urinary catheter through the first pipeline. The siphon tube includes an upper curved pipe. The liquid inlet end of the upper curved pipe is communicated with the inner cavity of the shell A. After the liquid flowing into the inner cavity of the shell A enters the upper curved pipe, it flows out from the liquid outlet of the upper curved pipe and finally flows into the urine collection container through the second pipeline.

[0009] The liquid inlet end of the upper bend is connected to the liquid inlet pipe, one end of the liquid inlet pipe is in the inner cavity of the shell A, and the other end is connected to the upper bend.

[0010] As a preferred embodiment, the upper end of the shell A is further provided with a liquid inlet C, the lower end of the shell A is provided with a liquid outlet A, the liquid outlet end of the upper bend is connected to the liquid inlet C, and the liquid inlet C and the liquid outlet A are conductive.

[0011] Furthermore, the inner cavity of the housing A is longitudinally divided into a first inner cavity and a second inner cavity. The upper end of the first inner cavity is provided with a liquid inlet A, and the lower end of the second inner cavity is provided with a liquid outlet A. The lower end of the liquid inlet pipe of the siphon tube is disposed in the first inner cavity. The liquid inlet of the upper bend pipe is connected to the upper end of the liquid inlet pipe, and the liquid outlet of the upper bend pipe is connected to the liquid inlet C, which is in communication with the second inner cavity. The first inner cavity is in communication with the air inlet provided with a one-way valve.

[0012] More preferably, the lower end of the liquid inlet pipe is connected to a boosting mechanism, which includes a shell B and a weight in the inner cavity of the shell B. The upper and lower ends of the shell B are respectively provided with a liquid outlet B and a liquid inlet B. The liquid outlet B is connected to the liquid inlet pipe, and a weight is provided at the liquid inlet B, and the liquid inlet B is closed or opened by the weight.

[0013] More preferably, a sealing member is provided under the weight, and the weight closes or opens the liquid inlet B through the sealing member.

[0014] Furthermore, the lower end of the liquid inlet pipe of the siphon tube is arranged in the inner cavity of the shell A, and the lower end of the liquid inlet C is connected to the liquid outlet A via a connecting pipe. The inner cavity of the shell A is connected to the air inlet provided with a one-way valve.

[0015] The housing A comprises an upper shell and a lower shell, the liquid inlet A is arranged at the upper end of the upper shell, and the liquid outlet A is arranged at the lower end of the lower shell.

[0016] As a preferred embodiment, the liquid outlet of the upper bend pipe is directly connected to the second pipeline.

[0017] The urine collection container is a urine bag made of an elastomer; or a urine bottle / urine bag made of a hard material, and is provided with an air inlet pipe communicating with the atmosphere.

[0018] The beneficial effects of the present invention are as follows: The catheterization system of the present application is provided with a siphon on the connecting catheter between the catheter and the urine collection bag. When urine gradually accumulates and the bladder gradually fills, the pressure gradually increases. When the pressure reaches the pressure set by the siphon, the urination system will automatically open until the urine in the bladder and the catheterization system is emptied, and the bladder will enter the next physiological cycle of filling and emptying. The discharge of urine in the bladder is controlled by the siphon, and the discharge of urine is related to the pressure in the bladder and the pressure setting of the siphon, and is related to the user's urination physiology, thereby avoiding the adverse effects of human control on the bladder. The system can be applied to different bladder pressures, and by adjusting the siphon pressure setting, it can be made equivalent to the user's bladder pressure (bladder pressure can stimulate the urinary system nerves to produce the urge to urinate). The normal physiological cycle of bladder filling and emptying can be easily achieved through this system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 It is a schematic diagram of the structure of a urinary catheterization system.

[0021] Figure 2This is a schematic diagram of the first siphon structure.

[0022] Figure 3 This is a schematic diagram of the second siphon structure.

[0023] Figure 4 This is a schematic diagram of the third siphon structure.

[0024] Figure 5 It is a top view of the shell A.

[0025] Figure 6 This is a schematic diagram of another urinary catheterization system structure.

[0026] Figure 7 This is a schematic diagram of the fourth siphon structure.

[0027] Figure 8 This is a schematic diagram of the fifth siphon structure.

[0028] In the figure: 1 urinary catheter, 2 connecting catheter, 21 first pipeline, 22 second pipeline, 3 siphon, 31 shell A, 311 upper shell, 312 lower shell, 321 liquid inlet A, 322 liquid inlet C, 33 liquid outlet A, 34 first inner cavity, 35 second inner cavity, 36 siphon, 361 liquid inlet pipe, 362 upper curved pipe, 37 boosting mechanism, 371 shell B, 372 liquid outlet B, 373 liquid inlet B, 374 weight, 375 sealing element, 38 connecting pipe, 39 one-way valve, 4 urine collection container, 41 air inlet pipe, 5 bladder. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. Example 1

[0031] The urinary catheterization system of the present invention is as follows Figure 1As shown, the urinary catheter system includes a urinary catheter 1, a urine collection container 4, and a connecting catheter 2 connecting the urinary catheter 1 and the urine collection container 4, the connecting catheter 2 includes a first pipeline 21 and a second pipeline 22, a siphon 3 is arranged between the first pipeline 21 and the second pipeline 22, the siphon 3 includes a shell A31 and a siphon tube 36, the upper end of the shell A31 is provided with a liquid inlet A321, the liquid inlet A321 is connected to the urinary catheter 1 through the first pipeline 21, the siphon tube 36 includes an upper bend 362, the liquid inlet end of the upper bend 362 is communicated with the inner cavity of the shell A31, the liquid flowing into the inner cavity of the shell A31 enters the upper bend 362, flows out from the liquid outlet of the upper bend 362, and finally flows into the urine collection container 4 through the second pipeline 22. The urine in the bladder 5 enters the siphon 3 and can be discharged only when the urine pressure in the bladder 5 can overcome the resistance of the siphon 3. Therefore, the urine discharge is related to the pressure in the bladder 5, so that the urinary catheterization system automatically urinates according to the urine pressure in the bladder 5, which is related to the user's urination physiology and avoids the adverse effects of human control on the bladder 5.

[0032] In this embodiment, the structure of the siphon 3 is as follows Figure 2 and Figure 5 As shown, the siphon 3 includes a housing A31 and a siphon tube 36. The siphon tube 36 includes an upper curved tube 362. The liquid inlet end of the upper curved tube 362 is connected to the liquid inlet tube 361. One end of the liquid inlet tube 361 is within the inner cavity of the housing A31, and the other end is connected to the upper curved tube 362. The upper end of the housing A31 is also provided with a liquid inlet C322, and the lower end of the housing A31 is provided with a liquid outlet A33. The liquid outlet end of the upper curved tube 362 is connected to the liquid inlet C322, and the liquid inlet C322 is in communication with the liquid outlet A33. The inner cavity of the shell A31 is longitudinally divided into a first inner cavity 34 and a second inner cavity 35. The first inner cavity 34 and the second inner cavity 35 are independent. A liquid inlet A321 is provided at the upper end of the first inner cavity 34, a liquid inlet C322 is provided at the upper end of the second inner cavity 35, and a liquid outlet A33 is provided at the lower end. The lower end of the liquid inlet pipe 361 of the siphon tube 36 is arranged in the first inner cavity 34, one end of the upper bend pipe 362 is connected to the upper end of the liquid inlet pipe 361, and the other end is connected to the liquid inlet C322, and the liquid inlet C322 is communicated with the second inner cavity 35; the first inner cavity 34 is connected to the air inlet provided with a one-way valve 39.

[0033] To facilitate the processing of the siphon 3 housing A31 and the installation of internal components, the housing A31 includes an upper housing 311 and a lower housing 312. The liquid inlet A321 and the liquid inlet C322 are both located at the upper end of the upper housing 311, and the liquid outlet A33 is located at the lower end of the lower housing 312.

[0034] The urine collection container 4 is a urine bag made of an elastomer, which expands as urine enters, ensuring that urine can flow smoothly in. The urine collection container 4 can also be a urine bottle / urine bag made of a hard material, which is provided with an air inlet pipe 41 connected to the atmosphere.

[0035] The working principle and process of the urinary catheterization system of the present invention are as follows:

[0036] (1) Urine in the bladder 5 flows into the first inner cavity 34 from the liquid inlet A321 through the urinary catheter 1 and the first pipeline 21, and the gas is discharged through the siphon tube 36 and the liquid outlet A33. Atmosphere can enter the first inner cavity 34 through the air inlet and the one-way valve 39, while the gas in the first inner cavity 34 cannot pass through in the reverse direction.

[0037] (2) As the amount of liquid entering the first inner cavity 34 gradually increases, the liquid enters the upper bend 362, which is higher than the liquid inlet A321. As the liquid rises, pressure (or pressure intensity) is generated. The height of the upper bend 362 determines the pressure in the first inner cavity 34 or the bladder 5.

[0038] (3) When the liquid passes the highest point of the upper bend 362, the liquid beyond the highest point breaks the original force balance due to gravity and begins to form a stable liquid flow.

[0039] (4) When there is no liquid in the bladder 5, the gravity of the liquid in the second pipe 22 will form a negative pressure in the first inner cavity 34 and the bladder 5. The negative pressure will open the one-way valve 39 connected to the first inner cavity 34. At this time, the pressure in the first inner cavity 34 and the bladder 5 will become atmospheric pressure, and the liquid in the pipe will flow out of the drainage hole under the action of gravity (siphon effect). The entire system will be at atmospheric pressure. At this time, the one-way valve 39 will close and the system will enter the next cycle. Example 2

[0040] The difference between this embodiment and embodiment 1 is that the structure of the siphon 3 is different. Figure 3 and Figure 5As shown, the siphon 3 includes a shell A31 and a siphon tube 36. The siphon tube 36 includes an upper bend tube 362 and a liquid inlet tube 361. The inner cavity of the shell A31 is longitudinally divided into a first inner cavity 34 and a second inner cavity 35. The first inner cavity 34 and the second inner cavity 35 are independent. A liquid inlet A321 is provided at the upper end of the first inner cavity 34, a liquid inlet C322 is provided at the upper end of the second inner cavity 35, and a liquid outlet A33 is provided at the lower end. The lower end of the liquid inlet tube 361 of the siphon tube 36 is arranged in the first inner cavity 34, one end of the upper bend tube 362 is connected to the upper end of the liquid inlet tube 361, and the other end is connected to the liquid inlet C322. The liquid inlet C322 is communicated with the second inner cavity 35; the first inner cavity 34 is communicated with the air inlet provided with a one-way valve 39. The lower end of the liquid inlet pipe 361 is connected to the boosting mechanism 37, which includes a housing B371 and a weight 374 in the inner cavity of the housing B371. The upper and lower ends of the housing B371 are respectively provided with a liquid outlet B372 and a liquid inlet B373. The liquid outlet B372 is connected to the liquid inlet pipe 361. The weight 374 is disposed at the liquid inlet B373, and the liquid inlet B373 is closed or opened by the weight 374. A sealing member 375 may also be provided below the weight 374, and the weight 374 seals or opens the liquid inlet B373 via the sealing member 375. When the upward force generated by the liquid entering the first inner cavity 34 is greater than the downward force of the weight 374, the weight 374 moves upward and the liquid inlet B373 opens, or when the liquid in the first inner cavity 34 can overcome the downward pressure applied to the seal 375 by the weight 374, the seal 375 opens, and the liquid flows from the liquid inlet B373 into the inner cavity of the shell B371, and then flows from the liquid inlet pipe 361 into the upper bend pipe 362.

[0041] In the first embodiment, the maximum pressure of the bladder 5 depends on the height of the upper curved tube 362. In this embodiment, the maximum pressure of the bladder 5 depends on the sum of the gravity of the weight 374 and the pressure generated by the height of the upper curved tube 362. The height of the upper curved tube 362 can be reduced by the pressure boosting mechanism 37. Example 3

[0042] In this embodiment, the structure of the siphon 3 is shown in FIG. Figure 4 and Figure 5 The siphon 3 includes a housing A31 and a siphon tube 36. The siphon tube 36 includes an upper curved tube 362 and a liquid inlet tube 361. The lower end of the liquid inlet tube 361 of the siphon tube 36 is disposed within the inner cavity of the housing A31. One end of the upper curved tube 362 is connected to the upper end of the liquid inlet tube 361, and the other end is connected to the upper end of the liquid inlet port C322. The lower end of the liquid inlet port C322 is connected to the liquid outlet A33 via a connecting tube 38. The inner cavity of the housing A31 is connected to the air inlet port equipped with a one-way valve 39. This embodiment differs from the first embodiment in that the inner cavity of the housing A31 is not partitioned. The second inner cavity 35 of the first embodiment is replaced by a connecting tube 38. The use of the connecting tube 38 simplifies the structure of the housing A31, facilitating manufacturing and reducing costs.

[0043] In this embodiment, a booster mechanism 37 can also be connected to the lower end of the liquid inlet pipe 361. The booster mechanism 37 includes a housing B371 and a weight 374 in the inner cavity of the housing B371. The upper and lower ends of the housing B371 are respectively provided with a liquid outlet B372 and a liquid inlet B373. The liquid outlet B372 is connected to the liquid inlet pipe 361. The liquid inlet B373 is provided with a seal 375. The weight 374 controls the seal 375 to close or open the liquid inlet B373, thereby shortening the height of the upper curved pipe 362. Example 4

[0044] The urinary catheter system of this embodiment is shown in FIG. Figure 6 , comprising a urinary catheter 1, a urine collection container 4, and a connecting conduit 2 connecting the urinary catheter 1 and the urine collection container 4. The connecting conduit 2 comprises a first pipeline 21 and a second pipeline 22. A siphon 3 is disposed between the first pipeline 21 and the second pipeline 22. The siphon 3 comprises a housing A31 and a siphon tube 36. The upper end of the housing A31 is provided with a liquid inlet A321, which is connected to the urinary catheter 1 through the first pipeline 21. The siphon tube 36 comprises an upper curved tube 362. The liquid inlet end of the upper curved tube 362 is in communication with the inner cavity of the housing A31. Liquid flowing into the inner cavity of the housing A31 enters the upper curved tube 362, flows out from the liquid outlet of the upper curved tube 362, and finally flows into the urine collection container 4 through the second pipeline 22. This embodiment differs from Examples 1, 2, and 3 in that the housing A31 of the siphon 3 does not have a liquid inlet C322. Instead, the liquid outlet of the upper curved tube 362 is directly connected to the second pipeline 22. Its siphon 3 structure is as follows Figure 7 The siphon 3 includes a housing A31 and a siphon tube 36. The siphon tube 36 includes an upper curved tube 362 and a liquid inlet tube 361. The lower end of the liquid inlet tube 361 of the siphon tube 36 is disposed within the inner cavity of the housing A31. One end of the upper curved tube 362 is connected to the upper end of the liquid inlet tube 361, and the other end is connected to the second pipeline 22. The inner cavity of the housing A31 is connected to the air inlet port provided with a one-way valve 39. The housing A31 of the siphon 3 in this embodiment has a simpler structure.

[0045] The siphon 3 can also be used as Figure 8In the structure shown, a boosting mechanism 37 is connected to the lower end of the liquid inlet pipe 361. The boosting mechanism 37 includes a housing B371 and a weight 374 in the inner cavity of the housing B371. The upper and lower ends of the housing B371 are respectively provided with a liquid outlet B372 and a liquid inlet B373. The liquid outlet B372 is connected to the liquid inlet pipe 361. The weight 374 is provided at the liquid inlet B373, and the liquid inlet B373 is closed or opened by the weight 374. A sealing member 375 can also be provided below the weight 374, and the weight 374 closes or opens the liquid inlet B373 through the sealing member 375. When the upward force generated by the liquid entering the inner cavity of shell A31 is greater than the downward force of the weight 374, the weight 374 moves upward and the liquid inlet B373 opens, or when the liquid in the inner cavity of shell A31 can overcome the downward pressure applied to the seal 375 by the weight 374, the seal 375 opens, and the liquid flows from the liquid inlet B373 into the inner cavity of shell B371, and then flows from the liquid inlet pipe 361 into the upper bend pipe 362.

[0046] In order to facilitate the processing of the shell A31 of the siphon 3 and the installation of internal components, the shell A31 includes an upper shell 311 and a lower shell 312 , and the liquid inlet A321 is provided on the upper shell 311 .

[0047] The present invention introduces a siphon 3 into a conventional urinary catheterization system to control urine discharge. The height of the upper bend 362 of the siphon tube 36 (or the height of the upper bend 362 of the siphon tube 36 + the weight of the weight 374 ) is designed according to the pressure in the bladder 5 during normal physiological urination. This allows the urinary catheterization system to automatically urinate according to the urine pressure in the bladder 5 , which is associated with the user's urination physiology, avoids the adverse effects of manual control on the bladder 5, and reduces the labor intensity of nursing work.

[0048] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A urinary catheterization system comprising a urinary catheter, a urine collection container, and a connecting conduit connecting the urinary catheter and the urine collection container, characterized in that: The connecting conduit includes a first pipeline and a second pipeline, and a siphon is arranged between the first pipeline and the second pipeline. The siphon includes a shell A and a siphon tube. The upper end of the shell A is provided with a liquid inlet A, and the liquid inlet A is connected to the urinary catheter through the first pipeline. The siphon tube includes an upper bend pipe and a liquid inlet pipe. One end of the liquid inlet pipe is in the inner cavity of the shell A, and the other end is connected to the liquid inlet of the upper bend pipe. The liquid flowing into the inner cavity of the shell A from the liquid inlet A enters the upper bend pipe from the liquid inlet pipe, flows out from the liquid outlet of the upper bend pipe, and finally flows into the urine collection container through the second pipeline; the lower end of the liquid inlet pipe is connected to the boosting mechanism, and the boosting mechanism includes a shell B and a weight in the inner cavity of the shell B. The upper and lower ends of the shell B are respectively provided with a liquid outlet B and a liquid inlet B. The liquid outlet B is connected to the liquid inlet pipe, and a weight is provided at the liquid inlet B to close or open the liquid inlet B by the weight; the inner cavity of the shell A is connected to the air inlet provided with a one-way valve.

2. The urinary catheterization system according to claim 1, characterized in that: The upper end of the shell A is further provided with a liquid inlet C, and the lower end of the shell A is provided with a liquid outlet A. The liquid outlet end of the upper bend is connected to the liquid inlet C, and the liquid inlet C and the liquid outlet A are in conduction.

3. The urinary catheterization system according to claim 2, characterized in that: The inner cavity of the shell A is longitudinally divided into a first inner cavity and a second inner cavity. A liquid inlet A is provided at the upper end of the first inner cavity, and a liquid outlet A is provided at the lower end of the second inner cavity. The lower end of the liquid inlet pipe of the siphon tube is arranged in the first inner cavity, the liquid inlet of the upper bend pipe is connected to the upper end of the liquid inlet pipe, the liquid outlet of the upper bend pipe is connected to the liquid inlet C, and the liquid inlet C is communicated with the second inner cavity.

4. The urinary catheterization system according to claim 2, characterized in that: The lower end of the liquid inlet pipe of the siphon tube is arranged in the inner cavity of the shell A, and the lower end of the liquid inlet C is connected to the liquid outlet A through a connecting pipe.

5. The urinary catheterization system according to claim 1, characterized in that: The liquid outlet of the upper curved pipe is directly connected to the second pipeline.

6. The urinary catheterization system according to claim 1, characterized in that: A sealing member is provided under the weight, and the weight closes or opens the liquid inlet B through the sealing member.

7. The urinary catheterization system according to any one of claims 1 to 5, characterized in that: The housing A includes an upper shell and a lower shell.

8. The urinary catheterization system according to claim 3, characterized in that: The first inner cavity is communicated with an air inlet provided with a one-way valve.

9. The urinary catheterization system according to claim 1, characterized in that: The urine collection container is a urine bag made of an elastomer; or a urine bottle / urine bag made of a hard material, and is provided with an air inlet pipe communicating with the atmosphere.

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