Syringe for flushing peritoneal dialysis tunnel portal

Abstract

The invention provides an injector for flushing a peritoneal dialysis tunnel portal, and relates to the technical field of injectors, an upper chamber and a lower chamber are formed in a vertical tube, a reverse valve group and a same-direction valve group which are pneumatically controlled are arranged in the upper chamber and the lower chamber respectively and are used for sucking and discharging old waste liquid, and a liquid inlet mechanism is provided with an independent control pull rod and an independent chamber. The method is used for extracting and injecting fresh flushing fluid and is driven by an auxiliary pneumatic mechanism to automatically open and close a corresponding valve group in a fluid discharging and feeding process, so that a new and old fluid channel is strictly isolated in time and space, and the method comprises the following steps of: sequentially completing pneumatic suction and discharge of waste fluid by pushing and pulling a first pull rod; after the pipelines are switched, the second pull rod is pushed and pulled to sequentially complete extraction and injection of new liquid, physical isolation closed-loop flushing is achieved through the integrated instrument, the problem of cross contamination caused by pipeline sharing in traditional operation is thoroughly solved, meanwhile, operation is simplified, and the safety and convenience of peritoneal dialysis tunnel portal flushing are improved.

Description

Technical Field

[0001] This invention relates to the field of syringe technology, and more specifically, to a syringe for flushing the opening of a peritoneal dialysis tunnel. Background Technology

[0002] Peritoneal dialysis is one of the commonly used renal replacement therapies for patients with end-stage renal disease. A peritoneal dialysis catheter is placed in the abdominal wall, and the "tunnel opening" formed by the subcutaneous segment of the catheter is a high-risk site for infection. To prevent and treat tunnel opening infection, the tunnel opening needs to be flushed regularly with sterile dialysis fluid or normal saline. The standard flushing procedure requires: first, using a syringe to aspirate and thoroughly drain any accumulated old exudate or debris from the tunnel opening; then, changing the syringe or using another chamber, injecting fresh, sterile dialysis fluid or flushing solution into the tunnel opening to achieve cleaning and infection prevention.

[0003] Currently, this procedure is commonly performed in clinical practice using ordinary syringes or simple dual-lumen syringes. Existing technologies have the following main drawbacks: There is a high risk of cross-contamination, and the sterility of the flushing solution cannot be guaranteed: Most existing devices require the same syringe chamber to draw fresh flushing solution after aspirating old solution before injection. The syringe plunger and barrel have already come into contact with contaminants during aspiration, and pathogenic microorganisms may remain on the inner wall of the distal chamber. When fresh solution is drawn again, it is highly susceptible to contamination. Subsequent injection of contaminants into the tunnel entrance not only fails to achieve cleaning and disinfection but may also trigger or worsen infection.

[0004] The procedure is cumbersome and increases the cost of consumables and the risk of infection: To avoid the aforementioned contamination, strict operating procedures require medical staff to prepare two separate syringes, one for aspiration and the other for injection. This increases the number of steps, the cost of consumables, and the risk of the connector being exposed to a non-sterile environment, resulting in accidental contamination or leakage during syringe changes.

[0005] Insufficient sealing reliability can easily lead to liquid leakage and environmental pollution: Some existing simple dual-channel designs often have relatively crude valve cores or sealing structures. Under dynamic operation with alternating positive pressure injection and negative pressure suction, liquid leakage from the interface or core rod is prone to occur due to poor sealing. This can not only contaminate the operating environment, but more seriously, the leaked bacterial liquid may in turn contaminate the operator's hands or instruments, creating a risk of cross-infection.

[0006] Therefore, there is an urgent clinical need for a novel peritoneal dialysis tunnel flushing device. This device should fundamentally achieve physical isolation between the aspiration and injection channels, or reliable one-way valve control, ensuring that fresh flushing fluid does not come into contact with contaminated tubing or chambers. Simultaneously, the device must possess excellent sealing performance, and the operation process should be integrated and simplified to reduce operational difficulty, improve the safety and effectiveness of flushing operations, and meet the stringent requirements of both hospital and home care. Summary of the Invention

[0007] (a) Technical problems to be solved To address the problems existing in the prior art, the present invention provides a syringe for flushing the peritoneal dialysis tunnel opening, thereby solving the technical problems mentioned in the background art.

[0008] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a syringe for flushing the peritoneal dialysis tunnel opening, comprising a drainage mechanism and a drainage mechanism; The drainage mechanism includes an upper cavity mechanism, a lower cavity mechanism, and an auxiliary mechanism. The drainage mechanism is used to drain old cleaning fluid from the patient's body through a catheter. The upper cavity mechanism is used to temporarily store the discharged old cleaning fluid, and together with the inlet mechanism, it injects fresh cleaning fluid into the patient's body through a catheter to clean contaminants. The lower chamber mechanism is used to discharge the sucked-out old cleaning fluid, and together with the liquid inlet mechanism, it temporarily stores the fresh rinsing fluid, so as to isolate it from the old cleaning fluid and avoid contaminating the fresh cleaning fluid. The auxiliary mechanism is used to assist the upper chamber mechanism and the lower chamber mechanism in completing the circulation of cleaning fluid inlet and outlet; The fluid inlet mechanism is used to introduce fresh cleaning fluid into the patient's body to clean contaminants. By reusing some components of the upper and lower chamber mechanisms, not only is the waste cleaning fluid and fresh cleaning fluid isolated, but the overall number of components is also reduced.

[0009] Preferably, the drainage mechanism further includes a bidirectional pipe and a vertical pipe, the vertical pipe and the bidirectional pipe being arranged vertically, and the upper and lower ends of the vertical pipe having an upper chamber and a lower chamber respectively, which ensure the continuity of liquid inflow and outflow.

[0010] Preferably, the upper cavity mechanism includes two reverse sleeves that are fixedly installed at the upper and lower ends of the upper cavity, and a reverse disc is respectively fitted inside the two reverse sleeves. When the reverse disc and the reverse sleeve are in the fitted state, they are both in a one-way sealed state.

[0011] Preferably, a first expansion disc and a second expansion disc are respectively installed on the side of the two reversing discs that are close to each other. The first expansion disc and the second expansion disc are respectively sealed and slidably connected in the upper chamber. A telescopic sleeve is provided on one side of the first expansion disc and a push spring is provided on the other end of the first expansion disc. A telescopic tube is provided on one side of the second expansion disc and a push spring is also provided on the other side of the second expansion disc. The two push springs respectively abut against the two reversing sleeves. The telescopic sleeve and the telescopic tube are sealed and connected to each other and are interconnected. An expansion cavity is formed between the upper chamber, the first expansion disc, the second expansion disc, the telescopic sleeve, and the telescopic tube.

[0012] Preferably, a top tube is fixedly provided at the upper end of the vertical tube, one end of the top tube is connected to the reverse sleeve at the upper end, and the other end of the top tube is connected to a catheter inside the patient's body.

[0013] Preferably, the lower cavity mechanism includes two unidirectional sleeves fixedly installed at the upper and lower ends of the upper cavity, and unidirectional discs are respectively fitted inside the two unidirectional sleeves. When the unidirectional discs and the unidirectional discs are in a mutually fitted state, they are in a unidirectional sealing state, and the sealing direction is opposite to the direction of the reverse disc and the reverse sleeve.

[0014] Preferably, a first shrinking disc and a second shrinking disc are respectively installed on the side of the two co-directional discs that are close to each other. The first shrinking disc is provided with an embedded tube on its coaxial axis, and the second shrinking disc is provided with an inner nest on its coaxial axis. The inner nest and the embedded tube are mutually sealed and slidably connected, and the embedded tube and the inner nest are interconnected. A shrinking cavity is formed between the lower chamber, the first shrinking disc, the second shrinking disc, the inner nest and the embedded tube. The first shrinking disc and the second shrinking disc are respectively provided with tension springs, and the other ends of the two tension springs are respectively connected to the co-directional sleeve.

[0015] Preferably, a bottom tube is fixedly provided at the lower end of the vertical tube, and the bottom tube is connected to the mutually fitted unidirectional sleeve. The bottom tube can be connected to an external collection device and an inlet bag respectively, and the inlet and outlet processes can be easily switched through the bottom tube.

[0016] Preferably, the auxiliary mechanism includes a left chamber disposed within the bidirectional tube. A rubber sleeve is slidably connected to the left chamber, and a left pull rod is connected to the rubber sleeve. The diameter of the rubber sleeve is slightly larger than the diameter of the left pull rod. Sealing rings are fixedly provided at both ends of the bidirectional tube, and the left pull rod and the sealing rings are slidably connected. The left pull rod, the rubber sleeve, the left sealing sleeve, and the left chamber form an auxiliary cavity. Air guide tubes are respectively provided at the upper and lower ends of the left side of the bidirectional tube. Microfluidic tubes are respectively connected to the two air guide tubes. The inner diameter of the microfluidic tubes is much smaller than the inner diameter of the air guide tubes. One end of the upper air guide tube is connected to the auxiliary cavity, and the other end of the upper air guide tube is connected to the expansion cavity. One end of the lower air guide tube is connected to the auxiliary cavity, and the other end of the lower air guide tube is connected to the contraction cavity.

[0017] Preferably, the liquid inlet mechanism includes a right chamber opened at the right end of the bidirectional tube, a rubber sleeve is slidably sealed inside the right chamber, a right pull rod is provided on the rubber sleeve, and right-angle holes are respectively opened at both ends of the vertical tube to communicate with the right chamber. The upper right-angle hole communicates with the space between the upper reverse sleeve and the first expansion plate, and the lower right-angle hole communicates with the space between the lower unidirectional sleeve and the second contraction plate.

[0018] (III) Beneficial Effects Compared with the prior art, the present invention provides a syringe for flushing the peritoneal dialysis tunnel opening, which has the following beneficial effects: This invention fundamentally eliminates the risk of cross-infection, ensuring the aseptic safety of the flushing operation. Through an innovative dual-chamber design (upper and lower chambers) and independently controlled pneumatic / hydraulic valve assemblies (reverse / co-directional discs), the mechanical structure achieves physical isolation and temporal separation between the drainage and inlet paths. The "suction-temporary storage-discharge" process for old waste liquid and the "suction-temporary storage-injection" process for fresh flushing liquid are respectively completed by different chambers and valve assemblies, ensuring that the two liquids do not share the same flow channel at any stage. This design fundamentally cuts off the pathway for contaminants to back-contaminate fresh liquid, significantly reducing the incidence of infection at the tunnel entrance.

[0019] This invention significantly simplifies the operation process, reducing operational difficulty and reliance on specialized skills. Traditional operations require the alternating use of multiple syringes, making the process cumbersome. This invention integrates complex multi-step operations into a single device. The operator only needs to pull two levers sequentially (left and right levers) to automatically complete the entire treatment cycle from drainage to infusion. The pneumatic auxiliary mechanism ensures automatic and reliable opening and closing of the valve assembly, eliminating the need for manual valve switching or complex judgments by the operator. This allows home caregivers or novice medical personnel to perform the operation safely and correctly, improving treatment adherence and accessibility.

[0020] This system improves the sealing reliability and operational fault tolerance of the device. Precise pneumatic pressure control of the valve assembly's opening and closing states (e.g., during drainage aspiration, air pressure simultaneously locks the outlet valve) and the use of microfluidics to achieve controllable, gradual pressure balancing prevents liquid leakage caused by unstable manual operation or sudden pressure changes. Push and tension springs provide stable preload to the valve discs, further ensuring the default sealing state of the valve ports. The entire system maintains reliable sealing under alternating positive and negative pressure, preventing the risk of environmental and operator pollution from medical waste leakage.

[0021] The compact and efficient structural design achieves functional integration and component reuse. The ingenious combination of vertical and bidirectional tubes allows for the high integration of the upper and lower chamber mechanisms, auxiliary mechanisms, and fluid inlet mechanism into a single device. Components such as the rubber sleeve and some chambers are reused in different modes, reducing the number of parts, manufacturing costs, and failure rates while ensuring functional isolation. This makes the device lighter and more suitable for clinical and home settings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a syringe for flushing the peritoneal dialysis tunnel opening according to the present invention; Figure 2 In this invention Figure 1 A schematic diagram of the cross-sectional structure; Figure 3 This is a cross-sectional view of the bidirectional tube and the vertical tube in this invention. Figure 4 This is a schematic diagram of the left pull rod in this invention; Figure 5 This is a schematic diagram of the structure of the first expansion disk and the second expansion disk in this invention; Figure 6 In this invention Figure 5 A schematic diagram of the cross-sectional structure; Figure 7 This is a schematic diagram of the structure of the first and second shrink discs in this invention; Figure 8 In this invention Figure 7 A schematic diagram of the cross-sectional structure; Figure 9 This is a flowchart illustrating the operation process in this invention.

[0023] In the diagram: 11. Bidirectional tube; 12. Vertical tube; 13. Upper chamber; 14. Lower chamber; 21. Upper chamber mechanism; 22. Reverse sleeve; 23. Reverse disc; 24. First expansion disc; 25. Second expansion disc; 26. Telescopic sleeve; 27. Push spring; 28. Telescopic tube; 29. ​​Expansion chamber; 31. Lower chamber mechanism; 32. Same-direction sleeve; 33. Same-direction disc; 34. First contraction disc; 35. Second contraction disc; 36. Embedded tube; 37. Inner nest; 38. Contraction chamber; 39. Tension spring; 41. Auxiliary mechanism; 42. Left chamber; 43. Rubber sleeve; 44. Left pull rod; 45. Sealing ring; 46. Auxiliary chamber; 47. Air guide tube; 48. Microfluidic tube; 51. Liquid inlet mechanism; 52. Right chamber; 53. Right pull rod; 54. Right angle hole; 210. Top tube; 310. Bottom tube. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0027] See Figure 1 The syringe for flushing the peritoneal dialysis tunnel entrance provided in this embodiment mainly consists of two parts: a drainage mechanism and a fluid inlet mechanism 51. The drainage mechanism is responsible for performing the core functions of "suctioning" and "discharging" old waste fluid; the fluid inlet mechanism 51 is responsible for performing the functions of "extracting" and "injecting" fresh flushing fluid after the drainage is completed. The two share some cavities, but strict temporal and spatial isolation is achieved in the fluid passage through valve assembly and piston action.

[0028] 1. Structure and composition of the drainage mechanism The drainage mechanism is crucial for the safe discharge of waste liquid. It includes a bidirectional pipe 11 and a vertical pipe 12 that is fixedly connected to it perpendicularly. The vertical pipe 12 is internally divided into upper and lower parts, forming an upper chamber 13 and a lower chamber 14, respectively. The entire drainage mechanism can be further divided into an upper chamber mechanism 21, a lower chamber mechanism 31, and an auxiliary mechanism 41.

[0029] 1.1 Upper cavity mechanism 21 The upper chamber mechanism 21 serves as the intake channel for waste liquid during drainage and the final output channel for fresh flushing liquid during intake. A reverse sleeve 22 is fixedly installed at both the top and bottom of the upper chamber 13. Each reverse sleeve 22 contains a reverse disc 23 that can be engaged with or separated from its conical surface. The fit between the reverse disc 23 and the reverse sleeve 22 is designed for a one-way seal; its default state (under the action of the push spring 27) is closed, allowing fluid to flow only from the interior of the vertical pipe 12 towards the top pipe 210, and vice versa, it is sealed and locked.

[0030] 1.2 Lower cavity mechanism 31 The lower chamber mechanism 31 is a temporary storage and final discharge channel for waste liquid during drainage, and also a channel for extracting fresh flushing liquid during liquid intake.

[0031] At the top and bottom of the lower chamber 14, a unidirectional sleeve 32 is fixedly installed. Each unidirectional sleeve 32 contains a unidirectional disc 33. The unidirectional disc 33 and the unidirectional sleeve 32 also form a one-way seal, but its conduction direction is opposite to that of the reverse valve. By default (under the action of the tension spring 39), it is closed, allowing fluid to flow only from the bottom pipe 310 to the interior of the vertical pipe 12.

[0032] Two unidirectional discs 33 are respectively connected to a first shrink disc 34 and a second shrink disc 35 on their opposite surfaces. The first shrink disc 34 is provided with an embedded tube 36, and the second shrink disc 35 is provided with an inner nest 37. The embedded tube 36 and the inner nest 37 are mutually sealed and slidably connected, and their inner cavities are interconnected. One end of two tension springs 39 is connected to the first shrink disc 34 and the second shrink disc 35 respectively, and the other end is connected to the corresponding unidirectional sleeve 32. Under normal conditions, they are in a stretched state, providing a preload force for the unidirectional discs 33 to press against the unidirectional sleeve 32.

[0033] Chamber Formation: A variable-volume contraction chamber 38 is formed by the inner wall of the lower chamber 14, the first contraction disc 34, the second contraction disc 35, the inner nest 37, and the inner tube 36. The bottom end of the lower chamber 14 is connected via a bottom tube 310, which can be switched to a waste liquid collection bag or a fresh flushing liquid bag.

[0034] 1.3 Auxiliary mechanisms 41 The auxiliary mechanism 41 is the control core that provides pneumatic driving force for the upper cavity mechanism 21 and the lower cavity mechanism 31. It is located in the left half of the bidirectional tube 11.

[0035] A rubber sleeve 43 is slidably installed in the left chamber 42 formed within the bidirectional tube 11. The rubber sleeve 43 is connected to a left pull rod 44 extending outside the tube. A sealing ring 45 is provided at the left end of the bidirectional tube 11 to ensure the sealing of the left pull rod 44 during sliding. The left pull rod 44, the rubber sleeve 43, the sealing ring 45, and the left end of the left chamber 42 together form a sealed auxiliary cavity 46.

[0036] At the upper and lower positions of the left sidewall of the bidirectional tube 11, there are two air guide tubes 47. The upper air guide tube 47 connects the auxiliary chamber 46 to the expansion chamber 29 of the upper chamber mechanism 21; the lower air guide tube 47 connects the auxiliary chamber 46 to the contraction chamber 38 of the lower chamber mechanism 31. Each air guide tube 47 is connected in parallel to a microfluidic tube 48 with a very small inner diameter (leading to the atmosphere). The function of the microfluidic tube 48 is to provide a controllable, slow pressure balance channel.

[0037] 2. Structure of the liquid inlet mechanism 51 The liquid inlet mechanism 51 is located on the right half of the bidirectional tube 11. It is structurally symmetrical to the auxiliary mechanism 41 but functionally independent.

[0038] Liquid circuit switching assembly: In the right chamber 52 formed within the bidirectional tube 11, a rubber sleeve 43 (independent of the rubber sleeve 43 of the auxiliary mechanism 41) is also sealed and slidably installed, which is connected to the right pull rod 53.

[0039] Connecting channels: A right-angle hole 54 is provided on the upper and lower end walls of the vertical tube 12. The upper right-angle hole 54 connects the right chamber 52 with the cavity between the upper reverse sleeve 22 and the first expansion plate 24 in the upper chamber 13; the lower right-angle hole 54 connects the right chamber 52 with the cavity between the lower same-direction sleeve 32 and the second contraction plate 35 in the lower chamber 14.

[0040] 3. Operating methods and procedures of the device 3.1 Drainage Mode (Aspiration and Drainage of Old Waste Fluid) Initial Setup. Connect the top tube 210 to the patient catheter and the bottom tube 310 to the waste fluid collection bag. Push the right lever 53 to the far left, so that its rubber sleeve 43 seals the two right-angle holes 54. Ensure that the left lever 44 is in the proper starting position. Aspirate the waste fluid. Pull the left lever 44 outward (to the left).

[0041] Pneumatic actuation: The left lever 44 moves to the left, reducing the volume of the auxiliary chamber 46 and increasing the air pressure. High-pressure gas simultaneously enters the expansion chamber 29 and the contraction chamber 38 through two air guide tubes 47. Due to the extremely small orifice of the microfluidic tube 48, the air pressure is released slowly, which is sufficient to maintain the driving pressure.

[0042] Forming an inhalation pathway: The air pressure entering the expansion chamber 29 pushes the first expansion disc 24 and the second expansion disc 25 to move in opposite directions against the elastic force of their respective push springs 27 (e.g., Figure 5 , Figure 6 As shown), both reverse discs 23 are disengaged from the reverse sleeve 22, allowing them to fully open. Simultaneously, the telescopic sleeve 26 and the telescopic tube 28 are stretched. At this moment, the top tube 210 communicates with the right space of the left chamber 42 (the right side of the rubber sleeve 43) through the opened upper chamber valve, the expansion chamber 29, and the inner cavity of the telescopic sleeve / tube 28.

[0043] The lower chamber valve is locked to ensure a seal: the air pressure entering the contraction chamber 38 synchronously acts on the first contraction disc 34 and the second contraction disc 35, generating a force that pulls them closer together. This, in turn, strengthens the force of the two unidirectional discs 33 pressing against the unidirectional sleeve 32 (e.g., Figure 7 , Figure 8 (As shown) is firmly locked.

[0044] Aspiration complete: As the left lever 44 is continuously pulled to the left, the volume of the right side of the left chamber 42 increases, creating negative pressure. Under the pressure difference, the old waste fluid in the patient's body is sequentially drawn into the left chamber 42 for temporary storage through the top tube 210, the opened upper valve, the expansion chamber 29, and the inner lumen of the telescopic tube / sleeve. Waste fluid is then discharged. The left lever 44 is pushed inward (to the right).

[0045] Pneumatically driven reversal: The left lever 44 moves to the right, increasing the volume of the auxiliary chamber 46 and creating negative pressure. The gas in the expansion chamber 29 and the contraction chamber 38 is drawn back into the auxiliary chamber 46, causing the pressure to drop.

[0046] The pressure inside the expansion chamber 29 decreases, and the two push springs 27 push the first expansion disc 24 and the second expansion disc 25 to reset, causing the two reverse discs 23 to press the reverse sleeve 22 shut again, thus isolating the patient end access.

[0047] Forming a discharge passage: After the pressure inside the contraction chamber 38 drops to a certain level, the tension of the two tension springs 39 overcomes the remaining air pressure and friction, pulling the first contraction disc 34 and the second contraction disc 35 to move in opposite directions, causing the two unidirectional discs 33 to disengage from the unidirectional sleeve 32 and open at the lower end.

[0048] Complete discharge: The volume of the left chamber 42 decreases and the pressure increases. Under pressure, the temporarily stored waste liquid is discharged into the waste liquid collection bag through the inner cavity of the inner tube 36 and the inner nest 37 and the open bottom tube 310.

[0049] Pressure balancing: After each operation, the pressure difference between the auxiliary chamber 46 and the atmosphere is slowly balanced through the microfluidic tube 48, preparing for the next operation. Repeating the steps of aspirating and discharging waste liquid allows for multiple flushing and aspiration operations.

[0050] 3.2 Fluid Injection Mode (Injecting Fresh Fluid) Mode switching and fresh fluid extraction. After drainage is complete, connect the bottom tube 310 to the fresh flushing fluid bag. Push the left lever 44 to the far right, so that its rubber sleeve 43 seals the middle of the vertical tube 12, completely isolating the upper chamber 13 from the lower chamber 14. Pull the right lever 53 outward (to the right).

[0051] Creating negative pressure: The right lever 53 moves to the right, the volume of the right chamber 52 increases, creating negative pressure.

[0052] The lower chamber valve opens to draw fluid: This negative pressure is transmitted through the lower right-angle hole 54 to the cavity between the lower unidirectional sleeve 32 and the second contraction disc 35. This pressure acts on the lower unidirectional disc 33, helping to overcome the tension of the tension spring 39 and separating it from the unidirectional sleeve 32 (as the upper chamber 14 is isolated, it is unaffected). At the same time, the upper chamber valve remains closed due to the action of the push spring 27 and the lack of driving pressure. Under the action of negative pressure, fresh flushing fluid is drawn into the right chamber 52 through the bottom tube 310, the open lower unidirectional valve, the contraction chamber 38, and the inner cavity of the inner tube / sleeve.

[0053] Inject new fluid. Push the right lever 53 inward (to the left).

[0054] Positive pressure is generated: the volume of the right chamber 52 decreases, and the pressure increases.

[0055] Initiating liquid injection: High-pressure liquid acts on the upper reverse plate 23 through the upper right-angle hole 54, overcoming the elastic force of the push spring 27 and separating it from the reverse sleeve 22 (the lower reverse valve is unaffected because the lower chamber 13 is isolated). At the same time, the lower chamber valve closes under the action of the tension spring 39.

[0056] Injection complete: Fresh flushing fluid in the right chamber 52 is injected into the patient's tunnel opening for flushing under pressure through the opened upper reverse valve, expansion chamber 29, top tube 210 and catheter.

[0057] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A syringe for flushing the peritoneal dialysis tunnel opening, characterized in that: Includes a draining mechanism and a filling mechanism (51); The drainage mechanism includes an upper cavity mechanism (21), a lower cavity mechanism (31), and an auxiliary mechanism (41), which is used to drain old cleaning fluid from the patient's body through a catheter; The upper cavity mechanism (21) is used to temporarily store the discharged old cleaning fluid, and together with the inlet mechanism (51), it injects fresh cleaning fluid into the patient's body through a catheter to clean contaminants. The lower chamber mechanism (31) is used to discharge the sucked-out old cleaning fluid, and together with the liquid inlet mechanism (51) temporarily stores the fresh rinsing fluid, so as to isolate it from the old cleaning fluid and thus avoid contaminating the fresh cleaning fluid. The auxiliary mechanism (41) is used to assist the upper cavity mechanism (21) and the lower cavity mechanism (31) in completing the circulation of cleaning fluid inlet and outlet; The liquid inlet mechanism (51) is used to introduce fresh cleaning fluid into the patient's body to clean contaminants. By reusing some parts of the upper cavity mechanism (21) and the lower cavity mechanism (31), not only is the waste cleaning fluid and fresh cleaning fluid isolated, but the overall number of parts is also reduced.

2. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 1, characterized in that: The drainage mechanism also includes a bidirectional pipe (11) and a vertical pipe (12). The vertical pipe (12) and the bidirectional pipe (11) are arranged vertically. The upper and lower ends of the vertical pipe (12) are respectively provided with an upper chamber (13) and a lower chamber (14). The upper chamber (13) and the lower chamber (14) ensure the continuity of liquid inflow and outflow.

3. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 2, characterized in that: The upper cavity mechanism (21) includes two reverse sleeves (22) that are fixedly installed at the upper and lower ends of the upper cavity (13), and a reverse disc (23) is respectively fitted inside the two reverse sleeves (22). When the reverse disc (23) and the reverse sleeve (22) are in a fitted state, they are both in a one-way sealed state.

4. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 3, characterized in that: A first expansion disc (24) and a second expansion disc (25) are respectively installed on the side of the two reverse discs (23) that are close to each other. The first expansion disc (24) and the second expansion disc (25) are respectively sealed and slidably connected in the upper chamber (13). A telescopic sleeve (26) is provided on one side of the first expansion disc (24), and a push spring (27) is provided on the other end of the first expansion disc (24). A telescopic tube (28) is provided on one side of the second expansion disc (25), and a push spring (27) is also provided on the other side of the second expansion disc (25). The two push springs (27) respectively abut against the two reverse sleeves (22). The telescopic sleeve (26) and the telescopic tube (28) are sealed and connected to each other, and the telescopic sleeve (26) and the telescopic tube (28) are interconnected. An expansion cavity (29) is formed between the upper chamber (13), the first expansion disc (24), the second expansion disc (25), the telescopic sleeve (26), and the telescopic tube (28).

5. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 4, characterized in that: The upper end of the vertical tube (12) is fixedly provided with a top tube (210), one end of the top tube (210) is connected to the reverse sleeve (22) at the upper end, and the other end of the top tube (210) is connected to the catheter in the patient's body.

6. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 4, characterized in that: The lower cavity mechanism (31) includes two unidirectional sleeves (32) fixedly installed at the upper and lower ends of the upper cavity (13), and unidirectional discs (33) are respectively fitted inside the two unidirectional sleeves (32). When the unidirectional discs (33) and the unidirectional discs (33) are in a mutually fitted state, they are in a unidirectional sealed state, and the sealing direction is opposite to the direction of the reverse disc (23) and the reverse sleeve (22).

7. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 6, characterized in that: A first shrink plate (34) and a second shrink plate (35) are respectively installed on the side of the two co-directional discs (33) that are close to each other. An inner tube (36) is coaxially provided on the first shrink plate (34), and an inner nest (37) is coaxially provided on the second shrink plate (35). The inner nest (37) and the inner tube (36) are mutually sealed and slidably connected, and the inner tube (36) and the inner nest (37) are interconnected. A shrinkage cavity (38) is formed between the lower chamber (14), the first shrink plate (34), the second shrink plate (35), the inner nest (37) and the inner tube (36). A tension spring (39) is provided on the first shrink plate (34) and the second shrink plate (35), and the other end of the two tension springs (39) is connected to the co-directional sleeve (32).

8. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 7, characterized in that: The lower end of the vertical tube (12) is fixedly provided with a bottom tube (310). The bottom tube (310) is connected to the mutually fitted unidirectional sleeve (32). The bottom tube (310) can be connected to the external collection device and the liquid inlet bag respectively. The liquid inlet and liquid outlet processes can be easily switched through the bottom tube (310).

9. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 8, characterized in that: The auxiliary mechanism (41) includes a left chamber (42) disposed within the bidirectional tube (11). A rubber sleeve (43) is slidably connected within the left chamber (42), and a left pull rod (44) is connected to the rubber sleeve (43). The diameter of the rubber sleeve (43) is slightly larger than the diameter of the left pull rod (44). Sealing rings (45) are fixedly provided at both ends of the bidirectional tube (11), and the left pull rod (44) and the sealing rings (45) are slidably connected. The left pull rod (44), the rubber sleeve (43), the left sealing sleeve, and the left chamber (42) form an auxiliary mechanism. The cavity (46) has air guide tubes (47) at the upper and lower ends of the left side of the bidirectional tube (11). Microfluidic tubes (48) are connected to the two air guide tubes (47). The inner diameter of the microfluidic tube (48) is much smaller than the inner diameter of the air guide tube (47). One end of the upper air guide tube (47) is connected to the auxiliary cavity (46), and the other end of the upper air guide tube (47) is connected to the expansion cavity (29). One end of the lower air guide tube (47) is connected to the auxiliary cavity (46), and the other end of the lower air guide tube (47) is connected to the contraction cavity (38).

10. The syringe for flushing the peritoneal dialysis tunnel opening according to claim 9, characterized in that: The liquid inlet mechanism (51) includes a right chamber (52) opened at the right end of the bidirectional tube (11). A rubber sleeve (43) is slidably sealed inside the right chamber (52). A right pull rod (53) is provided on the rubber sleeve (43). Right angle holes (54) are opened at both ends of the vertical tube (12) respectively, which are connected to the right chamber (52). The upper right angle hole (54) is connected to the space between the upper reverse sleeve (22) and the first expansion plate (24). The lower right angle hole (54) is connected to the space between the lower unidirectional sleeve (32) and the second contraction plate (35).

Images