A continuous bladder irrigation tubing system with anti-reflux and self-locking connector

Abstract

The application discloses a continuous bladder flushing pipeline system with an anti-reflux and self-locking joint and relates to the field of postoperative nursing appliances for urological surgery. The flushing pipeline and the drainage pipeline are respectively connected with a flushing liquid container and a drainage collection container, the anti-reflux unit is arranged on the pipeline and allows one-way flow of liquid, the self-locking joint is fixed to the proximal end of a three-cavity catheter connector and penetrates through in the axial direction to form a channel for liquid flow, and the constant-temperature preheating unit is sleeved outside the flushing pipeline. The pipeline system blocks reverse flow of liquid through the anti-reflux unit, realizes one-key locking and unlocking by means of the fixed joint seat and the movable joint plug-in cooperation of the self-locking joint and the pressing of the self-locking assembly, and preheats the flushing liquid through the constant-temperature preheating unit. The pipeline system integrates anti-reflux, self-locking connection and constant-temperature preheating and can effectively prevent pipeline falling and liquid reflux.

Description

Technical Field

[0001] This invention relates to the technology of postoperative care devices in urology, specifically to a continuous bladder irrigation tubing system with anti-backflow and self-locking connectors. Background Technology

[0002] Transurethral resection of the prostate (TURP) is currently the mainstream surgical procedure for treating benign prostatic hyperplasia in urology. Postoperatively, continuous bladder irrigation is routinely required to promptly remove blood clots and tissue debris from the bladder, observe wound bleeding, prevent tubing blockage and bladder spasm, and dynamically assess the degree of wound bleeding by observing the color, amount and rate of drainage fluid, providing a basis for clinical nursing and treatment decisions.

[0003] Currently, the commonly used clinical practice employs gravity flushing systems consisting of dispersed components such as an IV stand, flushing fluid bag, standard tubing, T-connector, three-lumen catheter, and drainage bag, which primarily rely on manual observation and adjustment. In this system, the flushing fluid and drainage fluid share the same tubing pathway, posing a risk of backflow.

[0004] To address the issue of backflow prevention, relevant technical solutions have been developed in the industry. For example, CN111135364A discloses an anti-backflow urine bag suitable for bladder irrigation with double-lumen and triple-lumen catheters. This bag uses a sealing connection structure between the urine bag connector and the catheter port, and achieves a tight seal with the infusion set tubing at the infusion set connector, thus reducing the risk of retrograde infection. However, compared to the gradual improvement of anti-backflow technology, a more prominent technical problem currently facing the field of continuous bladder irrigation is the stable maintenance of the tubing connection ports, specifically preventing dislodgement between the irrigation and drainage tubing and the triple-lumen catheter interface. Continuous bladder irrigation is a long-duration process, and patients often experience tubing traction due to changes in body position, examination transfers, or early postoperative activity. Existing irrigation tubing and triple-lumen catheter interfaces often use simple plug-in or threaded connections, which have limited axial holding force.

[0005] Regarding the issue of preventing pipe connections from detaching, the existing technologies are as follows:

[0006] 1) Patent application CN213100411U discloses a connector for bladder irrigation of an indwelling urinary catheter. This patent application includes a nipple connector, a one-way valve, and an irrigation connector. The nipple connector and the irrigation connector are respectively fixed to both ends of the one-way valve. The nipple connector consists of at least two layers of coaxial sleeves. The outer sleeve can slide along the inner sleeve. A first limiting ring and a second limiting ring are fixed on the inner sleeve to restrict the sliding of the outer sleeve. A rubber gasket is fixed to the sliding end of the outer sleeve, and an overflow hole is opened at the left end of the inner sleeve. The one-way valve includes a first valve body, a second valve body, a sealing plate, and a return spring. The irrigation connector has a stepped structure composed of multi-stage connecting tubes. This connector can accommodate syringe nipples of different outer diameters. At the same time, the connector uses a one-way valve to achieve one-way flushing to prevent backflow of flushing fluid and to prevent air and bacteria from entering the indwelling urinary catheter and causing iatrogenic infection. The connector uses an outer sleeve to slide and lock, making the connection between the connector and the flushing connector more secure and preventing the connector from falling off during bladder flushing.

[0007] 2) Publication No. CN217014888U discloses a bladder irrigation needle. This patent application includes a needle hub, a needle, and a ligating tube. The needle is connected to the end of an inlet tube. The needle hub wraps around and fixes the connection between the needle and the inlet tube. One end of the ligating tube is fixedly connected to the needle hub, and the other end is detachably connected to the needle hub. This bladder irrigation needle has a needle hub at the connection with the inlet tube. A ligating tube is located on one side of the needle hub, and the other side allows for detachable fixation of the other end of the ligating tube. In use, the needle is inserted into a catheter, and the ligating tube wraps around from one side of the catheter to the other, with its end connected to the other side of the needle hub, thus fixing the irrigation needle to the catheter to prevent it from falling out.

[0008] Of the aforementioned existing technical solutions, the former employs a sleeve sliding locking structure, which requires sliding the outer sleeve axially and relies on the compression deformation of the rubber gasket to provide locking force. This involves relatively many steps, and the maintenance of the locking force depends on the elastic retention capacity of the rubber gasket. Its locking reliability is uncertain after repeated insertion and removal or liquid immersion. The latter uses a binding tube for fixation, but its anti-loosening effect is related to the standardization of the binding operation and the precision of the binding tension control. Furthermore, unlocking requires releasing the binding fixation, and operational convenience needs further improvement. Therefore, the existing technology lacks a pipe fitting system that can ensure reliable axial locking while also considering operational convenience. Summary of the Invention

[0009] The purpose of this invention is to provide a continuous bladder irrigation tubing system with anti-backflow and self-locking connectors to solve the problem of tubing detachment in the prior art.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a continuous bladder irrigation tubing system with anti-backflow and self-locking connectors, comprising:

[0011] The flushing tubing has one end connected to the flushing container and the other end connected to the irrigation port of the three-lumen catheter, which is used to deliver the flushing fluid in the flushing container to the three-lumen catheter.

[0012] The drainage tube has one end connected to the drainage port of the three-lumen catheter and the other end connected to the drainage collection container, which is used to transport the fluid discharged through the three-lumen catheter to the drainage collection container.

[0013] The anti-backflow unit is installed on the fluid passage of the flushing pipeline or the drainage pipeline. The anti-backflow unit includes a one-way valve body, a valve seat installed in the one-way valve body, and a valve core installed in the one-way valve body. The valve core separates from the valve seat under the action of forward fluid pressure to open the corresponding pipeline, and abuts against the valve seat under the action of reverse fluid pressure to close the corresponding pipeline.

[0014] A self-locking connector is fixedly installed at the proximal end of the irrigation port and the proximal end of the drainage port of a three-lumen catheter. The self-locking connector forms a channel for the flow of irrigation or drainage fluid along the axial direction. The self-locking connector includes a fixed connector seat and a movable connector. The fixed connector seat has a first end and a second end. The first end is sealed and connected to the irrigation port or drainage port of the three-lumen catheter, and the second end has an insertion cavity on its inner side. The movable connector is located at the end of the irrigation / drainage line. The movable connector can be releasably inserted into the insertion cavity and forms an axial self-locking connection structure with the fixed connector seat.

[0015] The constant temperature preheating unit is jacketed outside the flushing pipeline and extends along the axial direction of the flushing pipeline. The inner side of the constant temperature preheating unit is provided with a heating element to preheat the flushing fluid flowing through the flushing pipeline.

[0016] Furthermore, the second end includes a cover plate integrally formed on its upper side and a plug guide integrally formed on its front side, wherein the plug guide extends axially along the fixed connector seat and surrounds the plug cavity.

[0017] Furthermore, the self-locking connector also includes a locking member movably disposed within the mounting cavity. The locking member has a locking portion facing the insertion cavity, and the outer peripheral surface of the movable connector has a limiting portion that cooperates with the locking portion. The locking member can move relative to the fixed connector seat between a locked position and a released position; that is, in the locked position, the locking portion and the limiting portion engage with each other to restrict the movable connector from axially exiting the insertion cavity; in the released position, the locking portion and the limiting portion disengage, allowing the movable connector to exit the insertion cavity.

[0018] Furthermore, the locking component is a locking plate vertically disposed within the mounting cavity. The locking plate has a clearance hole corresponding to the insertion cavity. The movable connector passes through the clearance hole, and at least a portion of the hole's edge forms a locking part. When the locking plate moves within the mounting cavity, it engages or disengages the locking part from the limiting part of the movable connector.

[0019] Furthermore, the limiting part is an annular limiting groove formed on the outer periphery of the movable joint. When the locking plate moves to the locking position, the edge of the clearance hole is embedded in the annular limiting groove to restrict the axial movement of the movable joint relative to the fixed joint seat; when the locking plate moves to the release position, the edge of the clearance hole exits the annular limiting groove.

[0020] Furthermore, the self-locking connector also includes a press-locking assembly, which includes a fixed housing, a T-shaped linkage, an elastic locking element, and a return spring. The lower end of the fixed housing is connected to the fixed connector, and the fixed housing has a receiving cavity, in which the elastic locking element is located. The T-shaped linkage includes a transverse connecting part fixed to the locking plate and a snap-fit ​​part located on the lower side of the transverse connecting part. The snap-fit ​​part is reciprocally inserted into the receiving cavity and cooperates with the elastic locking element.

[0021] Furthermore, a return spring is connected to the lower side of the elastic locking member. The elastic locking member includes two elastic locking arms disposed opposite each other within the receiving cavity, forming a locking channel between the two elastic locking arms for the movement of the locking part. When the locking part moves downward, the two elastic locking arms engage with the locking part to restrict the movement of the T-shaped linkage.

[0022] Furthermore, the self-locking assembly also includes an unlocking component disposed within the receiving cavity. The unlocking component is a guide pin, and the inner side of the fixed housing is provided with a circulating guide groove that cooperates with the guide pin. The circulating guide groove includes a pressing guide section, a locking section, and a release guide section connected in sequence. The locking section is a locking position that restricts the reverse movement of the guide pin. When the locking plate is pressed for the first time, the locking plate drives the T-shaped linkage to move downward, and the elastic locking component moves against the elastic force of the return spring, so that the guide pin enters the locking position along the pressing guide section to keep the movable core rod and the locking plate in the locked position. When the locking plate is pressed again, the guide pin disengages from the locking position and enters the release guide section, and the elastic locking component is released under the action of the return spring.

[0023] Compared with existing technologies, this invention provides a continuous bladder irrigation tubing system with anti-backflow and self-locking connectors. On one hand, one-way valves on the irrigation and drainage tubing ensure unidirectional fluid flow, effectively preventing backflow of irrigation and drainage fluids and reducing the risk of retrograde infection and abnormal fluctuations in bladder pressure. On the other hand, the insertion and engagement of the fixed and movable connectors of the split self-locking connector, combined with the locking plate and annular limiting groove, and the cyclic locking and unlocking function of the self-locking component, enables rapid insertion and removal of the tubing and the three-lumen catheter interface, as well as one-button self-locking fixation. This effectively prevents accidental dislodgement due to patient position changes, examination transport, or tubing traction. The entire tubing system of this invention integrates anti-backflow, self-locking connection, and constant temperature preheating functions into one compact and convenient structure. While ensuring simultaneous and continuous irrigation and drainage, it significantly improves the operational safety and tubing connection reliability of continuous bladder irrigation, reducing the difficulty of nursing procedures and the risk of patient complications. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the self-locking connector in Embodiment 2 of the present invention;

[0027] Figure 3 This is a three-dimensional structural diagram of the fixed connector seat in Embodiment 2 of the present invention;

[0028] Figure 4 This is a schematic diagram of the planar structure of the movable joint, locking plate, and self-locking assembly in Embodiment 2 of the present invention;

[0029] Figure 5 This is a schematic diagram of the movable joint in Embodiment 2 of the present invention;

[0030] Figure 6 This is a schematic diagram of the overall structure of the self-locking press assembly in Embodiment 2 of the present invention;

[0031] Figure 7 This is a partial structural diagram of the self-locking component in Embodiment 2 of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Flushing tubing; 2. Drainage tubing; 3. Anti-backflow unit; 4. Self-locking connector; 41. Fixed connector seat; 411. Cover plate; 412. Insertion guide; 42. Movable connector; 421. Annular limiting groove; 43. Locking pressure plate; 431. Locking part; 44. Press self-locking assembly; 441. Fixed housing; 442. T-shaped linkage; 443. Elastic locking element; 444. Return spring; 445. Unlocking component; 5. Constant temperature preheating unit; 6. Three-lumen catheter. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] As attached Figure 1 As shown:

[0036] Example 1:

[0037] The present invention provides a continuous bladder irrigation tubing system with anti-backflow and self-locking connector, including irrigation tubing 1, drainage tubing 2, anti-backflow unit 3, self-locking connector 4 and constant temperature preheating unit 5.

[0038] In one embodiment of the present invention, one end of the flushing pipeline 1 is connected to the flushing container, and the other end is connected to the irrigation port of the three-lumen catheter 6, for conveying the flushing fluid in the flushing container to the three-lumen catheter 6.

[0039] In one embodiment of the present invention, one end of the drainage tube 2 is connected to the drainage port of the three-lumen catheter 6, and the other end is connected to the drainage collection container, for conveying the fluid discharged through the three-lumen catheter 6 to the drainage collection container. The flushing tube 1 and the drainage tube 2 can be medical-grade polyvinyl chloride (PVC) tubing or medical-grade silicone tubing, with transparent or semi-transparent walls to facilitate observation of the fluid flow within the tube, and smooth inner walls to reduce blood clot adhesion.

[0040] In one embodiment of the present invention, an anti-backflow unit 3 is disposed on the fluid channel of the flushing line 1 or the drainage line 2. The anti-backflow unit 3 includes a one-way valve body, a valve seat disposed within the one-way valve body, and a valve core (not shown in the figure) movably disposed within the one-way valve body. The valve core separates from the valve seat under forward fluid pressure to open the corresponding line, and abuts against the valve seat under reverse fluid pressure to close the corresponding line. Specifically, the anti-backflow unit 3 disposed on the flushing line 1 is directed from the flushing fluid container towards the three-lumen catheter 6, ensuring that the flushing fluid can only flow unidirectionally into the bladder and cannot flow back into the flushing fluid container. The anti-backflow unit 3 disposed on the drainage line 2 is directed from the three-lumen catheter 6 towards the drainage collection container, ensuring that the drainage fluid can only be discharged unidirectionally into the drainage collection container and cannot flow back into the bladder. Through the above dual-path anti-backflow design, the backflow of flushing fluid and drainage fluid can be effectively prevented, avoiding retrograde infection and abnormal fluctuations in bladder pressure.

[0041] In one embodiment of the present invention, a self-locking connector 4 is fixedly installed at the proximal ends of the irrigation and drainage interfaces of the three-lumen catheter 6. The self-locking connector 4 extends axially to form a channel for the flow of irrigation or drainage fluid. The self-locking connector 4 is a standard interface injection molded from medical-grade polycarbonate (PC) or acrylonitrile-butadiene-styrene copolymer (ABS), and its interface size is adapted to the end connectors of the irrigation tubing 1 and the drainage tubing 2. The self-locking connector 4 has a built-in elastic sealing ring, which is compressed and deformed when the tubing connector is inserted to achieve a sealing connection and prevent leakage.

[0042] In one embodiment of the present invention, a constant temperature preheating unit 5 is sandwiched outside the flushing pipe 1 and extends along the axial direction of the flushing pipe 1. The inner side of the constant temperature preheating unit 5 is provided with a heating element for preheating the flushing fluid flowing through the flushing pipe 1. The constant temperature preheating unit uses a flexible electric heating film or resistance heating wire as the heating element, and its outer side is covered with a heat insulation layer to reduce heat loss.

[0043] Working Principle: Example 1 integrates anti-backflow, self-locking connection, and constant temperature preheating modules. The flushing tubing 1 and drainage tubing 2 are respectively connected to the irrigation chamber and drainage chamber of the three-lumen catheter 6, forming a complete flushing-drainage fluid pathway. This allows for continuous operation during continuous bladder flushing, with continuous irrigation and simultaneous drainage. In use, the flushing fluid flows from the flushing fluid container through flushing tubing 1 into the irrigation chamber (irrigation interface) of the three-lumen catheter 6 under gravity, and then enters the bladder to flush the postoperative wound. The drainage fluid containing blood clots and tissue debris is discharged through the drainage chamber (drainage interface) of the three-lumen catheter 6 and flows into the drainage collection container through drainage tubing 2. During irrigation, the anti-backflow unit 3 prevents both the irrigation fluid and drainage fluid from flowing back into the bladder, ensuring unidirectional fluid flow. The self-locking connector 4 connects the irrigation tubing 1, drainage tubing 2, and the corresponding interfaces of the three-lumen catheter 6, preventing accidental dislodgement due to patient position changes or tubing traction. The constant temperature preheating unit 5 preheats the irrigation fluid, ensuring it enters the bladder at near-physiological temperature, effectively reducing the incidence of bladder spasms and patient pain scores. The overall system is simple in structure and easy to operate, significantly improving the safety and patient comfort of continuous bladder irrigation.

[0044] As attached Figure 1 To be continued Figure 7 As shown:

[0045] Example 2:

[0046] This embodiment is basically the same as the previous embodiment, except that the self-locking connector 4 includes a fixed connector seat 41 and a movable connector 42. The fixed connector seat 41 has a first end and a second end. The first end is sealed to the irrigation or drainage interface of the three-lumen catheter 6, and the second end has an insertion cavity on its inner side. The movable connector 42 is located at the end of the flushing line 1 / drainage line 2. The movable connector 42 can be releasably inserted into the insertion cavity and forms an axial self-locking connection structure with the fixed connector seat 41. The second end includes a cover plate portion 411 integrally formed on its upper side and an insertion guide portion 412 integrally formed on its front side. The insertion guide portion 412 extends axially along the fixed connector seat 41 and surrounds the insertion cavity.

[0047] In one embodiment of the present invention, the self-locking connector 4 further includes a locking member movably disposed within the mounting cavity. The locking member has a locking portion 431 disposed toward the insertion cavity, and the outer peripheral surface of the movable connector 42 is provided with a limiting portion that cooperates with the locking portion 431. The locking member is movable relative to the fixed connector seat 41 between a locked position and a released position; that is, in the locked position, the locking portion 431 and the limiting portion engage with each other to restrict the movable connector 42 from axially exiting the insertion cavity; in the released position, the locking portion 431 and the limiting portion disengage, allowing the movable connector 42 to exit the insertion cavity.

[0048] In one embodiment of the present invention, the locking member is a locking plate 43 vertically disposed in the mounting cavity. The locking plate 43 has a clearance hole corresponding to the insertion cavity. The movable connector 42 passes through the clearance hole, and at least a portion of the edge of the clearance hole constitutes a locking part 431. When the locking plate 43 moves within the mounting cavity, it causes the locking part 431 to engage or disengage with the limiting part of the movable connector 42.

[0049] In one embodiment of the present invention, the limiting part is an annular limiting groove 421 formed on the outer periphery of the movable joint 42. When the locking plate 43 moves to the locking position, the edge of the clearance hole is embedded in the annular limiting groove 421 to limit the axial movement of the movable joint 42 relative to the fixed joint seat 41; when the locking plate 43 moves to the release position, the edge of the clearance hole exits the annular limiting groove 421.

[0050] In one embodiment of the present invention, the self-locking connector 4 further includes a press-locking assembly 44, which includes a fixed housing 441, a T-shaped linkage 442, an elastic locking member 443, and a return spring 444. The lower end of the fixed housing 441 is connected to the fixed connector, and a receiving cavity is provided inside the fixed housing 441. The elastic locking member 443 is disposed in the receiving cavity. The T-shaped linkage 442 includes a transverse connecting part fixedly connected to the locking plate 43 and a snap-fit ​​part disposed on the lower side of the transverse connecting part. The snap-fit ​​part is reciprocally inserted into the receiving cavity and cooperates with the elastic locking member 443.

[0051] In one embodiment of the present invention, a return spring 444 is connected to the lower side of the elastic locking member 443. The elastic locking member 443 includes two elastic locking arms disposed opposite each other within the receiving cavity, forming a locking channel between the two elastic locking arms for the movement of the locking portion. When the locking portion moves downward, the two elastic locking arms engage with the locking portion to restrict the movement of the T-shaped linkage member 442. The press-locking assembly 44 also includes an unlocking member 445 disposed within the receiving cavity. The unlocking component 445 is a guide pin. The inner side of the fixed housing 441 is provided with a circulating guide groove that mates with the guide pin. This circulating guide groove includes a pressing guide section, a locking section, and a release guide section connected in sequence. The locking section is a locking position that restricts the reverse movement of the guide pin. When the locking plate 43 is pressed for the first time, the locking plate 43 drives the T-shaped linkage 442 downwards. The elastic locking member 443 moves against the elastic force of the return spring 444, causing the guide pin to enter the locking position along the pressing guide section, thus holding the movable core rod and the locking plate 43 in the locked position. When the locking plate 43 is pressed again, the guide pin disengages from the locking position and enters the release guide section. The elastic locking member 443 is released under the action of the return spring 444. This press-to-lock assembly 44 realizes a cyclic operation mode of locking with one press and unlocking with another press. The operation is extremely simple; medical staff can complete the locking and unlocking operations with one hand. The locked state is stable and reliable, effectively avoiding accidental unlocking due to accidental contact.

[0052] Working principle: During continuous bladder irrigation in clinical practice, patients often experience tubing traction due to changes in body position, examination transfer, or limb movement. If the connection between the irrigation tubing 1 or drainage tubing 2 and the three-lumen catheter 6 relies solely on a simple insertion or threaded connection, its resistance to dislodgement is limited. Under a certain degree of axial tension, the end of the tubing is prone to loosening or even completely dislodging from the irrigation or drainage port of the three-lumen catheter 6. This not only leads to interruption of irrigation and leakage of irrigation fluid contaminating the bed unit, but may also cause blood clots to form and block the tubing due to the failure to promptly remove bleeding from the wound after irrigation interruption. This increases the risk of bladder spasm, secondary bleeding, and urinary tract infection. At the same time, nurses need to repeatedly patrol and re-insert the tubing, significantly increasing the nursing workload and the patient's medical safety risks. To address the aforementioned issues, Embodiment 2 employs a structure where a separate fixed connector 41 and a movable connector 42 are fitted together. The fixed connector 41 is fixedly mounted on the proximal end of the interface of the three-lumen catheter 6, while the movable connector 42 is positioned at the end of the flushing line 1 or the drainage line 2. After the two are connected, axial positioning is achieved through the interlocking of the locking plate 43 and the annular limiting groove 421. Furthermore, the cyclic locking and unlocking function of the self-locking assembly 44 ensures a reliable axial locking connection between the tubing and the interface of the three-lumen catheter 6. When the movable connector 42 is inserted into the insertion cavity of the fixed connector seat 41, the locking plate 43 automatically moves to the locking position under the drive of the pressing self-locking component 44. The edge of the clearance hole is embedded in the annular limiting groove 421 on the outer periphery of the movable connector 42 to form an axial stop, effectively preventing the movable connector 42 from coming out of the insertion cavity due to pulling or accidental collision. When it is necessary to remove the tubing, press the locking plate 43 again, press the self-locking component 44 to release the locking state, the locking plate 43 resets, the edge of the clearance hole exits the annular limiting groove 421, and the movable connector 42 can be smoothly pulled out. Compared with the traditional threaded connection or simple plug-in method, Embodiment 2 can realize one-click quick insertion and removal and reliable locking, with high connection strength and strong resistance to dislodgement. At the same time, it is easy to operate and effectively reduces the risk of tube dislodgement and the difficulty of nursing operation during continuous bladder irrigation.

[0053] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A continuous bladder irrigation tubing system with anti-backflow and self-locking connectors, characterized in that, include: The flushing line (1) is connected at one end to the flushing container and at the other end to the irrigation port of the three-lumen catheter (6); The drainage tube (2) is connected at one end to the drainage port of the three-lumen catheter (6) and at the other end to the drainage collection container; The anti-backflow unit (3) is installed on the fluid channel of the flushing pipe (1) or the drainage pipe (2). The anti-backflow unit (3) includes a one-way valve body, a valve seat installed in the one-way valve body, and a valve core installed in the one-way valve body. The valve core separates from the valve seat under the action of positive fluid pressure to open the corresponding pipe, and abuts against the valve seat under the action of reverse fluid pressure to close the corresponding pipe. The self-locking connector (4) is fixedly installed at the proximal end of the irrigation port and the proximal end of the drainage port of the three-lumen catheter (6). The self-locking connector (4) forms a channel for the flow of irrigation fluid or drainage fluid along the axial direction. The self-locking connector (4) includes a fixed connector seat (41) and a movable connector (42). The fixed connector seat (41) has a first end and a second end. The first end is sealed and connected to the irrigation port or drainage port of the three-lumen catheter (6). The second end has an insertion cavity on its inner side. The movable connector (42) is located at the end of the irrigation line (1) or the drainage line (2). The movable connector (42) can be released into the insertion cavity and forms an axial self-locking connection structure with the fixed connector seat (41). The constant temperature preheating unit (5) is sandwiched outside the flushing pipe (1) and extends along the axial direction of the flushing pipe (1). The inner side of the constant temperature preheating unit (5) is provided with a heating element for preheating the flushing liquid flowing through the flushing pipe (1).

2. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector as described in claim 1, characterized in that, The second end includes a cover plate portion (411) integrally formed on its upper side and a plug guide portion (412) integrally formed on its front side, wherein the plug guide portion (412) extends along the axial direction of the fixed connector seat (41) and is disposed around the plug cavity.

3. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector as described in claim 1, characterized in that, The self-locking connector (4) also includes a locking member movably disposed in the mounting cavity. The locking member has a locking part (431) disposed facing the insertion cavity. The outer peripheral surface of the movable connector (42) is provided with a limiting part that cooperates with the locking part (431).

4. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector as described in claim 3, characterized in that, The locking member is a locking plate (43) vertically disposed in the mounting cavity. The locking plate (43) has a clearance hole corresponding to the insertion cavity. The movable joint (42) passes through the clearance hole. At least part of the edge of the clearance hole constitutes a locking part (431).

5. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector according to claim 3, characterized in that, The limiting part is an annular limiting groove (421) formed on the outer periphery of the movable joint (42).

6. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector as described in claim 1, characterized in that, The self-locking connector (4) further includes a press-locking assembly (44), which includes a fixed housing (441), a T-shaped linkage (442), an elastic locking element (443), and a return spring (444). The lower end of the fixed housing (441) is connected to the fixed connector. The fixed housing (441) has a receiving cavity, and the elastic locking element (443) is located in the receiving cavity.

7. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector according to claim 6, characterized in that, The T-shaped linkage (442) includes a transverse connecting part fixedly connected to the locking plate (43) and a snap-fit ​​part disposed on the lower side of the transverse connecting part, wherein the snap-fit ​​part is reciprocally inserted into the receiving cavity and cooperates with the elastic locking member (443).

8. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector according to claim 7, characterized in that, The lower side of the elastic locking member (443) is connected to a reset spring (444). The elastic locking member (443) includes two elastic locking arms disposed opposite each other in the receiving cavity, and a locking channel for the locking part to move is formed between the two elastic locking arms.

9. A continuous bladder irrigation tubing system with anti-backflow and self-locking connector according to claim 6, characterized in that, The press-locking assembly (44) also includes an unlocking member (445) disposed within the receiving cavity.

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