Anti-suck back infusion connector

Abstract

The utility model discloses a kind of anti-suck back infusion connector, including upper cover and lower cover, the bottom of the upper cover is equipped with cavity, the upper cover and lower cover are connected by screw thread, anti-suck back connecting assembly is provided between the upper cover and lower cover, the anti-suck back connecting assembly includes high-pressure valve core and sleeve rod, the high-pressure valve core is arranged inside the cavity, the sleeve rod is installed at the top of lower cover.The utility model is removed when infusion is completed infusion device, spring release reset force pushes piston rod to move up, drives high-pressure valve core to rebound quickly, makes the inner cavity of connector form positive pressure, forces residual liquid to flow to human body, prevents blood from flowing back to the inner cavity of connector, realizes high-efficiency anti-suck back, eliminates the effect of blood reflux, sealing ring on the surface of high-pressure valve core and cavity are closely combined, cooperate the deformation sealing of valve core reset time, form mechanical and elastic double anti-backflow structure, reduce nursing workload and patient risk.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an anti-backflow infusion connector. Background Technology

[0002] In recent years, needle-free infusion technology has been widely adopted in clinical practice, eliminating the need for needle punctures in infusion systems. This is significant for reducing patient discomfort, protecting venous blood vessels, maintaining medication access, reducing the occupational risk of needlestick infections for operators, lessening the workload of healthcare workers, and improving treatment quality. However, while needle-free infusion technology is now widely used, existing infusion connectors have significant drawbacks: after the infusion is completed and the infusion set or needle is removed, the silicone rubber valve body inside the connector can easily generate negative pressure as it returns to its original shape, causing medication and blood to flow back into the connector's lumen, potentially leading to complications such as infusion line embolism and infection. Furthermore, traditional connectors are single-function and lack positive pressure, requiring anticoagulants to maintain access, increasing nursing workload and patient risk. Therefore, a backflow-prevention infusion connector needs to be designed. Utility Model Content

[0003] The purpose of this invention is to provide an anti-backflow infusion connector to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an anti-backflow infusion connector, comprising an upper cover and a lower cover, wherein the bottom of the upper cover has a cavity, the upper cover and the lower cover are connected by threads, an anti-backflow connection assembly is provided between the upper cover and the lower cover, the anti-backflow connection assembly includes a high-pressure valve core and a sleeve rod, the high-pressure valve core is disposed inside the cavity, the sleeve rod is installed on the top of the lower cover, the bottom of the lower cover has a liquid inlet communicating with the cavity, and a sealing ring adapted to the cavity is installed on the surface of the high-pressure valve core.

[0005] Preferably, a spring is sleeved on the surface of the sleeve rod, a piston groove is provided at the bottom of the high-pressure valve core, the top of the spring passes through the piston groove and extends into it, and a piston rod adapted to it is provided inside the piston groove.

[0006] Preferably, a mounting base is installed at the bottom of the piston rod, the bottom of the mounting base contacts the top of the spring, and both the bottom of the piston rod and the bottom of the mounting base are provided with annular insertion holes adapted to the sleeve rod, and three protrusions are installed at equal intervals around the top of the piston rod.

[0007] Preferably, the upper cover, lower cover, sleeve rod, and piston rod are all made of PC, the high-pressure valve core is made of silicone rubber, the spring is made of 316L stainless steel, and the top of the upper cover is fitted with a threaded joint that communicates with the cavity.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] When the infusion set is removed after the infusion is completed, the spring releases its restoring force, pushing the piston rod upward and causing the high-pressure valve core to rebound quickly. This creates positive pressure inside the connector, forcing the residual liquid to flow into the body and preventing blood from flowing back into the connector cavity. This achieves highly efficient anti-backflow and eliminates blood backflow. The sealing ring on the surface of the high-pressure valve core fits tightly with the cavity, and together with the deformation seal during valve core reset, it forms a dual anti-backflow structure of mechanical and elasticity, reducing nursing workload and patient risk. Attached Figure Description

[0010] Figure 1 This is an exploded view of the three-dimensional structure of this utility model;

[0011] Figure 2 This is an exploded three-dimensional structural view of the bottom view of this utility model;

[0012] Figure 3 This is a three-dimensional structural diagram of the piston rod, mounting base, and protrusion of this utility model;

[0013] Figure 4 This is a structural cross-sectional view of the piston rod mounting base and annular socket of this utility model from the front view.

[0014] Figure 5 This is an exploded view of the structure of the top cover and high-pressure valve core of this utility model.

[0015] Figure 6 This is a structural cross-sectional view of the top cover and high-pressure valve core of this utility model.

[0016] In the diagram: 1. Upper cover, 2. Lower cover, 100. Cavity, 3. Anti-backflow connection assembly, 31. High-pressure valve core, 32. Sleeve rod, 33. Liquid inlet, 300. Sealing ring, 34. Spring, 35. Piston groove, 36. Piston rod, 37. Mounting base, 38. Annular socket, 39. Protrusion, 4. Threaded connector. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-6An anti-backflow infusion connector includes an upper cover 1 and a lower cover 2. The bottom of the upper cover 1 has a cavity 100. The upper cover 1 and the lower cover 2 are connected by threads. An anti-backflow connection component 3 is provided between the upper cover 1 and the lower cover 2.

[0019] The anti-backflow connection assembly 3 includes a high-pressure valve core 31 and a sleeve 32. The high-pressure valve core 31 is located inside the cavity 100. The sleeve 32 is installed on the top of the lower cover 2. The bottom of the lower cover 2 has a liquid inlet 33 that communicates with the cavity 100. A sealing ring 300 adapted to the cavity 100 is fixedly connected to the surface of the high-pressure valve core 31. The surface of the sealing ring 300 is in contact with the inner wall of the cavity 100. A spring 34 is sleeved on the surface of the sleeve 32. A piston groove 35 is opened at the bottom of the high-pressure valve core 31. The top of the spring 34 passes through the piston groove 35 and extends into it. A piston rod 36 adapted to the piston groove 35 is arranged inside it. A mounting seat 37 is fixedly connected to the bottom of the piston rod 36. The bottom of the mounting seat 37 is in contact with the top of the spring 34. Both the bottom of the piston rod 36 and the bottom of the mounting seat 37 have annular insertion ports 38 adapted to the sleeve 32. Three protrusions 39 are fixedly connected to the top of the piston rod 36 at equal intervals.

[0020] The upper cover 1, lower cover 2, sleeve rod 32 and piston rod 36 are all made of PC, the high pressure valve core 31 is made of silicone rubber, the spring 34 is made of 316L stainless steel, and the top of the upper cover 1 is fixedly connected to a threaded connector 4 that communicates with the cavity 100. The threaded connector 4 can be directly rotated and threadedly connected to a standard infusion set, syringe, or heparin cap.

[0021] The connector must be sterilized by high-pressure steam at 121℃ to ensure it is sterile before use.

[0022] When the infusion is completed and the infusion set is removed, the spring 34 releases its restoring force, pushing the piston rod 36 upward, which causes the high-pressure valve core 31 to rebound quickly, creating positive pressure in the inner cavity of the connector. This forces the residual liquid to flow into the body, preventing blood from flowing back into the inner cavity of the connector, thus achieving a highly efficient anti-backflow effect and eliminating blood backflow. The sealing ring 300 on the surface of the high-pressure valve core 31 fits tightly with the cavity 100, and together with the deformation seal during valve core reset, it forms a dual anti-backflow structure of mechanical and elasticity, reducing nursing workload and patient risk.

[0023] In use, the infusion set plug is inserted through the upper cover 1 and presses down on the high-pressure valve core 31, causing the piston rod 36 to move downwards. This causes the mounting base 37 to compress the spring 34, allowing the sleeve rod 32 to insert into the annular socket 38. The sealing ring 300 separates from the inner wall of the cavity 100, and the liquid flows into the patient's body through the gap between the upper cover 1 and the outer wall of the high-pressure valve core 31, via the liquid inlet 33 of the lower cover 2. After the infusion set plug is pulled out, the spring 34 releases its restoring force (5-8N), pushing the mounting base 37 and piston rod 36 upwards quickly. The annular socket 38 slides upwards along the sleeve rod 32, causing the high-pressure valve core 31 to reset. When the high-pressure valve core 31 resets, the elastic deformation of its silicone rubber material generates an upward thrust, creating positive pressure in the inner cavity of the connector. Residual liquid is squeezed out and flows into the body. At the same time, the sealing ring 300 fits tightly against the inner wall of the cavity 100, and together with the deformation seal at the top of the high-pressure valve core 31, prevents blood from flowing back into the inner cavity of the connector.

[0024] 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-backflow infusion connector, characterized in that: The device includes an upper cover (1) and a lower cover (2). The bottom of the upper cover (1) has a cavity (100). The upper cover (1) and the lower cover (2) are connected by threads. An anti-backflow connection assembly (3) is provided between the upper cover (1) and the lower cover (2). The anti-backflow connection assembly (3) includes a high-pressure valve core (31) and a sleeve (32). The high-pressure valve core (31) is located inside the cavity (100). The sleeve (32) is installed on the top of the lower cover (2). The bottom of the lower cover (2) has a liquid inlet (33) that communicates with the cavity (100). A sealing ring (300) that is compatible with the cavity (100) is installed on the surface of the high-pressure valve core (31).

2. The anti-backflow infusion connector according to claim 1, characterized in that: A spring (34) is sleeved on the surface of the sleeve rod (32). A piston groove (35) is provided at the bottom of the high-pressure valve core (31). The top of the spring (34) passes through the piston groove (35) and extends into it. A piston rod (36) is provided inside the piston groove (35) to match it.

3. The anti-backflow infusion connector according to claim 2, characterized in that: The bottom of the piston rod (36) is equipped with a mounting base (37), the bottom of the mounting base (37) is in contact with the top of the spring (34), and both the bottom of the piston rod (36) and the bottom of the mounting base (37) are provided with annular insertion ports (38) that are compatible with the sleeve rod (32). The top of the piston rod (36) is provided with three protrusions (39) that are equidistant from each other.

4. The anti-backflow infusion connector according to claim 3, characterized in that: The upper cover (1), lower cover (2), sleeve rod (32) and piston rod (36) are all made of PC, the high pressure valve core (31) is made of silicone rubber, the spring (34) is made of 316L stainless steel, and the top of the upper cover (1) is equipped with a threaded joint (4) that communicates with the cavity (100).

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