Remaining needle heparin lock with backflow prevention function

Abstract

The invention discloses an indwelling needle heparin lock with an anti-backflow function, and belongs to the technical field of medical puncture tools. Comprising a main pipeline, a branch pipeline is integrally formed on the right side of the main pipeline, a main pipe cap is fixedly connected to the upper portion of the outer side wall of the main pipeline, a branch pipe cap sleeves the upper portion of the outer side wall of the branch pipeline, an extension pipe is fixedly connected to the lower surface of the main pipeline, and the interior of the extension pipe communicates with the interior of the main pipeline; the main pipeline and the branch pipeline are integrally formed, the medical duckbilled valve is arranged in the main pipeline, the stable one-way conduction effect can be achieved, liquid can smoothly pass through during infusion, the valve port is automatically closed when infusion is stopped or a blood backflow trend exists, blood backflow is fundamentally blocked, and the safety of infusion is improved. The risks of pipeline blockage, blood return pollution and infection are effectively reduced, and needle-free closed operation can be achieved in cooperation with the first silica gel diaphragm in the main pipe cap.

Description

Technical Field

[0001] This invention relates to the field of medical puncture equipment technology, and in particular to a heparin lock for an indwelling needle with anti-reflux function. Background Technology

[0002] As a commonly used medical auxiliary device in clinical practice, the indwelling needle heparin lock is mainly used to seal the end of the catheter during the infusion interval, thereby sealing the tubing and preventing blood from flowing out and air from entering. It also facilitates subsequent infusion, flushing, and sealing operations. It is widely used in various clinical treatment scenarios. To meet the basic needs of clinical infusion, existing indwelling needle heparin locks are usually equipped with a main line and branch lines. The main line serves as the main channel for drug infusion, flushing, and sealing, while the branch lines are mainly used for air venting before infusion to prevent air bubbles from entering the patient's blood vessels during infusion and causing adverse consequences. However, when using the branch line for venting in existing indwelling needle heparin locks, the sealing cap on the outside of the branch line needs to be fully opened to achieve tubing connection and complete venting. Since the branch line is directly connected to the outside after the sealing cap is fully opened, and the tip of the indwelling needle catheter is in a conductive state with the patient's blood vessel, the blood in the blood vessel is very likely to flow out to the outside through the main line and branch line under its own pressure. This not only causes blood loss and increases patient discomfort, but may also lead to tubing contamination, thereby increasing the risk of catheter-related bloodstream infections. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a solution to the problems described in the background art.

[0004] Technical solution: A heparin lock for an indwelling needle with anti-reflux function, comprising a main pipeline, a branch pipeline integrally formed on the right side of the main pipeline, a main pipeline cap fixedly connected to the upper side of the outer wall of the main pipeline, a branch pipeline cap sleeved on the upper side of the outer wall of the branch pipeline, and an extension tube fixedly connected to the lower surface of the main pipeline, the interior of the extension tube being connected to the interior of the main pipeline. A medical duckbill valve is fixedly connected inside the main pipe. A through-type mounting groove is opened on the upper surface of the main pipe cap. A silicone diaphragm is fixedly connected to the inner side wall of the mounting groove.

[0005] Furthermore, a fixed circular plate is provided on the inner wall of the branch pipe, and multiple support rods are fixedly connected to the outer wall of the fixed circular plate. The outer walls of the multiple support rods are all fixedly connected to the inner wall of the branch pipe. A sliding rod is fixedly connected to the center of the inner wall of the branch pipe cap. The bottom end of the sliding rod passes through the fixed circular plate and is fixedly connected to a limiting plate. A spring is sleeved on the outer wall of the sliding rod. The two ends of the spring are fixedly connected to the opposite sides of the fixed circular plate and the limiting plate, respectively. The spring is made of medical-grade stainless steel.

[0006] Furthermore, a sealing ring is embedded in the inner wall of the branch pipe cap, and the inner wall of the sealing ring contacts the outer wall of the branch pipe.

[0007] Furthermore, the upper inner surface of the branch cap is provided with a through-type mounting groove II, and a silicone diaphragm II is fixedly connected to the inner side wall of the mounting groove II.

[0008] Furthermore, the outer wall of the extension tube is fitted with a sleeve, and the inside of the sleeve is provided with an arc-shaped abutment plate. The left side of the arc-shaped abutment plate is rotatably connected to an adjusting screw via a rotating shaft. The left end of the adjusting screw extends to the left side of the sleeve and is fixedly connected to a knob. The outer wall of the adjusting screw is threadedly connected to the inside of the sleeve. A limit strip is fixedly connected to the upper surface of the arc-shaped abutment plate, and the lower surface of the limit strip is slidably connected to the upper surface of the sleeve.

[0009] Furthermore, a locking hole is provided on the outer wall of the branch pipe below the branch pipe cap. A connecting plate is fixedly connected to the lower surface of the branch pipe cap. A second knob is provided on the right side of the connecting plate. A locking screw is fixedly connected to the left end of the second knob. The left end of the locking screw is threaded to the inner wall of the locking hole.

[0010] Furthermore, the inner side of the fixed circular plate is provided with multiple semi-circular limiting vertical grooves, and the outer side wall of the slide rod is fixedly connected with multiple semi-circular vertical strips. The outer side walls of the multiple semi-circular vertical strips are slidably connected to the inner side walls of the multiple semi-circular limiting vertical grooves respectively.

[0011] Beneficial effects: This invention adopts an integrated structure of main pipeline and branch pipeline, and a medical duckbill valve is installed inside the main pipeline, which can achieve a stable one-way flow effect. During infusion, the liquid can pass through smoothly. When the infusion is stopped or there is a tendency for blood backflow, the valve automatically closes, fundamentally blocking blood backflow and effectively reducing the risk of pipeline blockage, blood backflow contamination and infection. Combined with the silicone diaphragm in the main pipeline cap, needle-free closed operation can be achieved, making it safer and more hygienic to use. The branch pipe of this invention adopts a pull-up branch cap with a spring automatic reset structure. When venting, simply pull the branch cap upward to open the pipe for venting. After releasing, the spring automatically rebounds and closes the pipe. There is no need to completely disassemble the sealing components, which avoids the problem of blood leakage during venting in traditional structures. At the same time, the sealing ring improves the sealing reliability. Combined with the semi-circular limiting vertical groove and semi-circular vertical bar guide structure, the sliding rod rises and falls more smoothly without tilting or jamming, which significantly improves the smoothness of operation and the stability of use. This invention features a silicone diaphragm inside the bronchus cap, allowing for direct puncture for medication administration and flushing without opening the bronchus cap. The needle hole is automatically sealed after needle removal, meeting the needs of temporary clinical medication administration without disrupting the airtightness of the tubing. This further expands the application scenarios of the device. An adjustable jacket structure is installed on the outside of the extended tube, allowing for precise control of the tubing's on / off state via a knob. This facilitates temporary clamping of the tubing by medical staff during procedures such as air removal and dressing changes, improving the flexibility and controllability of clinical operations. The present invention features a locking hole and locking screw structure on the outside of the branch tube. After venting and resetting, the branch tube cap can be mechanically locked by knob two, effectively preventing accidental opening of the branch tube cap due to accidental contact or pulling during use, avoiding safety hazards such as blood leakage and air ingress. The overall structure is reasonably designed and easy to operate. Venting, sealing, locking and drug administration can be completed without complicated steps, greatly improving the operating efficiency of medical staff, while enhancing the safety and durability of the device. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view structural schematic diagram of the main pipe, main pipe cap, branch pipe and branch pipe cap of the present invention; Figure 3 This is a bottom view schematic diagram of the branch cap, slide bar, fixed circular plate, spring and locking screw of the present invention; Figure 4 This is a schematic diagram of the structure of the jacket, adjusting screw, arc-shaped abutment plate, and limiting strip of the present invention; Figure 5 This is a schematic diagram of the structure of the fixed circular plate of the present invention; Figure 6 This is the present invention. Figure 2 A magnified structural diagram of point A in the middle.

[0013] In the diagram: 1. Main pipe; 2. Branch pipe; 3. Main pipe cap; 4. Branch pipe cap; 5. Extension pipe; 6. Medical duckbill valve; 7. Installation groove one; 8. Silicone diaphragm one; 9. Fixing plate; 10. Support rod; 11. Slide rod; 12. Limiting plate; 13. Spring; 14. Sealing ring; 15. Installation groove two; 16. Silicone diaphragm two; 17. Jacket; 18. Arc-shaped abutment plate; 19. Adjusting screw; 20. Knob one; 21. Limiting strip; 22. Locking hole; 23. Connecting plate; 24. Knob two; 25. Locking screw; 26. Semi-circular limiting vertical groove; 27. Semi-circular vertical strip. Detailed Implementation

[0014] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Example like Figures 1-6 As shown, a heparin lock for an indwelling needle with anti-reflux function is provided, including a main tube 1, a branch tube 2 integrally formed on the right side of the main tube 1, a main tube cap 3 fixedly connected to the upper side of the outer wall of the main tube 1, a branch tube cap 4 sleeved on the upper side of the outer wall of the branch tube 2, an extension tube 5 fixedly connected to the lower surface of the main tube 1, and the interior of the extension tube 5 communicating with the interior of the main tube 1; a medical duckbill valve 6 fixedly connected to the interior of the main tube 1, and a through-type mounting groove 7 opened on the upper surface of the interior of the main tube cap 3, with a silicone diaphragm 8 fixedly connected to the inner side wall of the mounting groove 7; A fixed circular plate 9 is provided on the inner wall of the branch pipe 2. Multiple support rods 10 are fixedly connected to the outer wall of the fixed circular plate 9. The outer walls of the multiple support rods 10 are all fixedly connected to the inner wall of the branch pipe 2. A sliding rod 11 is fixedly connected to the center of the inner wall of the branch pipe cap 4. The bottom end of the sliding rod 11 passes through the fixed circular plate 9 and is fixedly connected to the limiting plate 12. A spring 13 is sleeved on the outer wall of the sliding rod 11. The two ends of the spring 13 are fixedly connected to the opposite sides of the fixed circular plate 9 and the limiting plate 12, respectively. The spring 13 is made of medical grade stainless steel. By adopting a one-piece molded structure for the main pipe 1 and branch pipe 2, the overall structure is robust, stable, and has excellent sealing performance, effectively preventing pipe loosening or leakage during use. The main pipe cap 3, fixed to the upper outer wall of the main pipe 1, has an internal installation groove 7 and a silicone diaphragm 8, enabling needle-free, sealed connection and puncture operations. Infusion, flushing, and sealing can be completed without disassembling any parts during use, reducing the risk of air entering the tubing and lowering the probability of contamination at the interface. A medical duckbill is fixed inside the main pipe 1. Valve 6 has a one-way flow characteristic. During infusion, the pressure of the medication can smoothly push the valve opening and allow the medication to flow into the extension tube 5 and enter the patient's blood vessel. When the infusion is stopped or there is a tendency for blood backflow, the medical duckbill valve 6 will quickly close under its own elasticity and reverse pressure, reliably blocking blood backflow and preventing blood from clotting and blocking the tubing. At the same time, it reduces the risk of blood spillage and infection. The inner wall of the branch tube 2 is fixedly connected to the fixed circular plate 9 by multiple support rods 10, forming a stable support and guiding structure. The sliding rod 11 fixed in the center of the inner side of the branch tube cap 4 passes through the fixed circular plate 9 and is provided at the end. The limiting plate 12 is fitted with a medical-grade stainless steel spring 13 on its outer side. This spring has excellent elastic recovery performance, corrosion resistance, and biocompatibility, and will not cause irritation or adverse reactions to the human body. During the venting operation, medical staff only need to gently lift the branch cap 4 upwards to move the sliding rod 11 upwards and open the internal passage of the branch pipe 2, smoothly venting the air bubbles accumulated in the pipe. After the operation is completed, the branch cap 4 is released, and the spring 13 quickly releases its elastic force to push the limiting plate 12, sliding rod 11, and branch cap 4 downwards to automatically reset, restoring the airtight seal of the branch pipe 2. The entire venting process does not require complete removal of the branch cap 4, avoiding the problem of blood flowing out of the blood vessel due to the complete opening of the sealing cap during venting with traditional heparin locks. This reduces blood loss and discomfort for the patient, effectively prevents blood from contaminating the tubing and surrounding environment, and lowers the possibility of catheter-related infections. At the same time, this structure is simple and convenient to operate, with smooth and reliable action. Venting and sealing can be completed without complicated steps, significantly improving the operating efficiency of medical staff, optimizing the safety and practicality of using the indwelling needle heparin lock, and extending the effective use time of the indwelling needle.

[0016] like Figure 3 and Figure 6 As shown, a sealing ring 14 is embedded in the inner wall of the branch cap 4, and the inner wall of the sealing ring 14 is in contact with the outer wall of the branch pipe 2. The inner wall of the sealing ring 14 fits tightly against the outer wall of the branch pipe 2 to form a reliable radial seal, which further improves the sealing performance and safety of the branch pipe 2 when closed, effectively reduces the risk of infection, and enhances the stability and hygiene of clinical use.

[0017] like Figures 1-3 As shown, a through-type mounting groove 15 is provided on the inner upper surface of the branch cap 4, and a silicone diaphragm 16 is fixedly connected to the inner side wall of the mounting groove 15. A silicone diaphragm 2 16 is fixedly connected to the inner wall of the mounting groove 2 15. This silicone diaphragm 2 16 has good elasticity and self-sealing performance. It can be used to replenish medication, administer medication by injection, or perform small-volume flushing operations directly through the syringe needle without opening the branch cap 4 or damaging the sealed state of the pipeline. After the needle is removed after puncture, it can automatically close the needle hole to keep the pipeline sealed and prevent leakage and air ingress. This not only meets the needs of temporary medication replenishment and administration in clinical settings, but also avoids problems such as blood leakage, pipeline contamination, or air ingress caused by disassembling parts. Combined with the venting and sealing structure of the branch pipeline 2, it further expands the functionality of the device and improves the flexibility and convenience of clinical operations.

[0018] like Figure 1 and Figure 4 As shown, the outer wall of the extension tube 5 is fitted with a sleeve 17, and the inside of the sleeve 17 is provided with an arc-shaped abutment plate 18. The left side of the arc-shaped abutment plate 18 is rotatably connected to an adjusting screw 19 via a rotating shaft. The left end of the adjusting screw 19 extends to the left side of the sleeve 17 and is fixedly connected to a knob 20. The outer wall of the adjusting screw 19 is threadedly connected to the inside of the sleeve 17. The upper surface of the arc-shaped abutment plate 18 is fixedly connected to a limiting strip 21, and the lower surface of the limiting strip 21 is slidably connected to the upper surface of the sleeve 17. Rotating knob 20 can drive the adjusting screw 19 to rotate in and out, thereby pushing the arc-shaped stop plate 18 to move smoothly, realizing the compression closure or release of the extension tube 5. The limiting strip 21 can effectively limit the rotational deviation of the arc-shaped stop plate 18, ensuring its stable displacement along a straight line. This allows medical staff to block or restore the flow of fluid in the pipeline at any time according to clinical needs. The operation is precise and the locking is reliable. It can temporarily close the pipeline to prevent blood backflow or fluid leakage during operations such as air exhaust and dressing changes, and can also quickly achieve pipeline clamping in daily use, improving the overall controllability and safety of use.

[0019] like Figure 3 and Figure 6 As shown, a locking hole 22 is provided on the outer wall of the branch pipe 2 and below the branch cap 4. A connecting plate 23 is fixedly connected to the lower surface of the branch cap 4. A knob 24 is provided on the right side of the connecting plate 23. A locking screw 25 is fixedly connected to the left end of the knob 24. The left end of the locking screw 25 is threadedly connected to the inner wall of the locking hole 22. After the venting operation is completed and the branch cap 4 is loosened to allow it to automatically reset, the locking screw 25 can be screwed into the locking hole 22 by rotating the knob 24, so that the branch cap 4 and the branch pipe 2 form a firm mechanical locking state. This effectively prevents the branch cap 4 from being accidentally lifted and opening the pipe due to accidental contact or pulling during transportation, nursing or daily use, and prevents problems such as blood leakage, air entry and pipe contamination caused by this. This further improves the stability and safety of the device during use and ensures that the anti-backflow and sealing effect are always reliable.

[0020] like Figure 3 and Figure 5 As shown, the inner side of the fixed circular plate 9 is provided with multiple semi-circular limiting vertical grooves 26, and the outer side wall of the slide rod 11 is fixedly connected with multiple semi-circular vertical bars 27. The outer side walls of the multiple semi-circular vertical bars 27 are slidably connected to the inner side walls of the multiple semi-circular limiting vertical grooves 26 respectively. The interlocking and guiding of the semi-circular vertical bar 27 and the semi-circular limiting vertical groove 26 can effectively limit the circumferential rotation of the slide rod 11 during the lifting and resetting of the branch cap 4, ensuring that the slide rod 11 moves smoothly and linearly only in the vertical direction, avoiding jamming or poor sealing due to shaking or skew, making the opening and closing action of the branch cap 4 smoother and more stable, and further improving the operational stability and sealing accuracy of the entire branch pipeline 2 opening and closing structure.

[0021] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A heparin lock for an indwelling needle with anti-reflux function, comprising a main pipeline (1), characterized in that: A branch pipe (2) is integrally formed on the right side of the main pipe (1). A main pipe cap (3) is fixedly connected to the upper side of the outer wall of the main pipe (1). A branch pipe cap (4) is sleeved on the upper side of the outer wall of the branch pipe (2). An extension pipe (5) is fixedly connected to the lower surface of the main pipe (1). The interior of the extension pipe (5) is connected to the interior of the main pipe (1). A medical duckbill valve (6) is fixedly connected inside the main pipe (1), and a through-type mounting groove (7) is opened on the upper surface of the main pipe cap (3). A silicone diaphragm (8) is fixedly connected to the inner side wall of the mounting groove (7).

2. The indwelling needle heparin lock with anti-reflux function according to claim 1, characterized in that: The inner wall of the branch pipe (2) is provided with a fixed circular plate (9), and the outer wall of the fixed circular plate (9) is fixedly connected with multiple support rods (10). The outer walls of the multiple support rods (10) are fixedly connected to the inner wall of the branch pipe (2). A sliding rod (11) is fixedly connected at the center of the inner wall of the branch pipe cap (4). The bottom end of the sliding rod (11) passes through the fixed circular plate (9) and is fixedly connected to a limiting plate (12). A spring (13) is sleeved on the outer wall of the sliding rod (11). The two ends of the spring (13) are fixedly connected to the opposite sides of the fixed circular plate (9) and the limiting plate (12), respectively. The spring (13) is made of medical grade stainless steel.

3. The indwelling needle heparin lock with anti-reflux function according to claim 1, characterized in that: A sealing ring (14) is embedded in the inner wall of the branch cap (4), and the inner wall of the sealing ring (14) is in contact with the outer wall of the branch pipe (2).

4. A heparin lock for an indwelling needle with anti-reflux function according to claim 1, characterized in that: The inner upper surface of the branch cap (4) is provided with a through-type mounting groove 2 (15), and a silicone diaphragm 2 (16) is fixedly connected to the inner side wall of the mounting groove 2 (15).

5. A heparin lock for an indwelling needle with anti-reflux function according to claim 1, characterized in that: The outer wall of the extension tube (5) is fitted with a sleeve (17), and an arc-shaped abutment (18) is provided inside the sleeve (17). An adjusting screw (19) is rotatably connected to the left side of the arc-shaped abutment (18) via a rotating shaft. The left end of the adjusting screw (19) extends to the left side of the sleeve (17) and is fixedly connected to a knob (20). The outer wall of the adjusting screw (19) is threadedly connected to the inside of the sleeve (17). A limiting strip (21) is fixedly connected to the upper surface of the arc-shaped abutment (18), and the lower surface of the limiting strip (21) is slidably connected to the upper surface of the sleeve (17).

6. A heparin lock for an indwelling needle with anti-reflux function according to claim 1, characterized in that: A locking hole (22) is provided on the outer wall of the branch pipe (2) and below the branch cap (4). A connecting plate (23) is fixedly connected to the lower surface of the branch cap (4). A knob (24) is provided on the right side of the connecting plate (23). A locking screw (25) is fixedly connected to the left end of the knob (24). The left end of the locking screw (25) is threadedly connected to the inner wall of the locking hole (22).

7. A heparin lock for an indwelling needle with anti-reflux function according to claim 2, characterized in that: The inner side of the fixed circular plate (9) is provided with a plurality of semi-circular limiting vertical grooves (26), and the outer side wall of the slide rod (11) is fixedly connected with a plurality of semi-circular vertical strips (27). The outer side walls of the plurality of semi-circular vertical strips (27) are respectively slidably connected to the inner side walls of the plurality of semi-circular limiting vertical grooves (26).

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