An automatic positive pressure sealing device and a flushing device

Abstract

This invention discloses an automatic positive pressure sealing device and a flushing device in the field of medical auxiliary device technology. The automatic positive pressure sealing device includes a liquid supply mechanism, which comprises a liquid storage tube and a pushing assembly, the pushing assembly being disposed within the receiving cavity of the liquid storage tube. The pushing assembly includes a piston and a push rod. The piston is disposed within the receiving cavity, and an elastic element is provided between the push rod and the piston. This elastic element converts the mechanical energy of the push rod's movement into stable elastic potential energy. The elastic element slowly releases this potential energy, allowing the piston to apply pressure to the liquid in the storage tube for an extended period, maintaining the liquid in the storage tube under a long-term positive pressure state. This positive pressure, relative to human blood pressure, prevents blood backflow into the venous catheter. After the push rod moves a certain distance toward the piston, it remains relatively fixed relative to the storage tube, facilitating the release of elastic potential energy by the elastic element towards the piston. This ensures that the elastic potential energy of the elastic element is fully applied to the piston, achieving automatic sealing operation.

Description

Technical Field

[0001] This invention belongs to the field of medical auxiliary device technology, specifically relating to an automatic positive pressure tube sealing device and a tube flushing device. Background Technology

[0002] In clinical practice, intravenous infusion is a common method for delivering medications to the body. During infusion, when the infusion ends, blood may flow back into the venous catheter, potentially forming a thrombus and blocking it. Therefore, nurses need to perform a flushing and sealing procedure using a syringe. This procedure involves flushing and sealing the catheter. Flushing involves injecting saline solution into the venous catheter to rinse its interior. Sealing involves injecting a measured amount of solution into the venous catheter to create a positive pressure environment relative to the body's blood pressure, preventing blood from flowing back into the catheter and forming a thrombus after the infusion ends.

[0003] Some patients require long-term intravenous infusions. After each infusion, a catheter locking procedure is necessary to prevent blood backflow and prepare for the next infusion. However, under current catheter locking techniques, it is difficult to maintain a blood pressure higher than the patient's blood pressure within the venous catheter for extended periods. When the interval between infusions is long, blood backflow into the venous catheter can still occur. Therefore, professional medical staff need to perform frequent catheter locking procedures to maintain catheter patency and prevent blood backflow into the catheter lumen, which can lead to thrombosis. If blood backflows into the venous catheter lumen and forms a thrombus, thrombolysis or catheter replacement is required. This places a significant workload on medical staff and increases patient discomfort during the infusion process. Summary of the Invention

[0004] The purpose of this invention is to disclose an automatic positive pressure sealing device and a flushing device, which can create a positive pressure liquid environment for a longer period of time to prevent blood from flowing back into the venous catheter.

[0005] To achieve the above objectives, the present invention discloses an automatic positive pressure sealing device, comprising:

[0006] The liquid supply mechanism includes a liquid storage tube and a propulsion assembly, wherein the liquid storage tube has an interconnected receiving cavity and a liquid outlet, the liquid outlet being used to communicate with a venous catheter connected to a human blood vessel;

[0007] The pushing assembly includes a piston and a push rod; the piston is movably disposed within the receiving cavity, and the receiving cavity between the piston and the liquid outlet constitutes a liquid storage space for storing liquid;

[0008] The push rod is located on the side of the piston opposite to the liquid outlet; the push rod is movably disposed within the receiving cavity, and an elastic element is provided between the push rod and the piston;

[0009] When the push rod moves toward the piston, the reservoir tube restricts the push rod's degree of freedom, keeping the push rod in its current position. The elastic element is compressed under the action of the push rod, and the piston gradually moves toward the outlet under the abutment of the elastic element. This allows the liquid pressure in the reservoir space to be continuously discharged into the venous catheter through the outlet, maintaining the internal hydraulic pressure of the venous catheter at a positive pressure relative to the human body's blood pressure.

[0010] As an optional implementation, the inner wall of the liquid storage tube is provided with at least one first limiting rib, and the push rod is provided with a second limiting rib that can cooperate with the first limiting rib; during the process of the push rod moving towards the piston, if the second limiting rib cooperates with the first limiting rib, the first limiting rib will prevent the push rod from moving away from the piston; and / or, the push rod is provided with a ratchet that engages with the first limiting rib, and through the cooperation of the ratchet and the first limiting rib, the push rod can move unidirectionally towards the piston.

[0011] As an optional implementation, the ratchet teeth are continuously distributed along the length of the push rod, and each ratchet tooth has at least two latches with uniform spacing between them; the push rod has a scale value corresponding to the position of the latch, and the scale value is used to indicate the displacement of the push rod.

[0012] As an optional implementation, the push rod is threadedly connected to the inner wall of the liquid storage tube, and rotating the push rod causes the push rod to move relative to the liquid storage tube toward the piston.

[0013] As an optional implementation, a dispensing mechanism is included, which is connected to the supply mechanism. The dispensing mechanism includes a first connector and a second connector. The first connector is connected to the venous catheter, and the second connector is used to connect to an external liquid source. The dispensing mechanism is used to control the venous catheter to be connected to the external liquid source or the supply mechanism.

[0014] As an optional implementation, the liquid dispensing mechanism includes a three-way valve, which is connected to the liquid supply mechanism, the first connector, and the second connector. The three-way valve is equipped with a switch, which is used to control the opening and closing of the liquid delivery path between the liquid supply mechanism and the intravenous catheter, or the opening and closing of the liquid delivery path between the external liquid source and the intravenous catheter.

[0015] As an optional implementation, the liquid distribution mechanism includes a branch pipe, which includes a main pipe and branch pipes. The two ends of the main pipe are respectively provided with a first connector and a second connector. One end of the branch pipe is connected to the main pipe, and the other end is connected to the liquid supply mechanism. A first pipe clamp is provided on the branch pipe, which is used to control the opening and closing of the liquid delivery path between the liquid supply mechanism and the main pipe. A second pipe clamp is provided on the end of the main pipe near the second connector, which is used to control the opening and closing of the liquid delivery path between the external liquid source and the first connector.

[0016] As an optional implementation, the first connector includes an inner tube and an outer tube that are coaxially fixed together, the inner tube being in communication with the venous catheter and the outer tube being detachably connected to the venous catheter.

[0017] Another aspect of the present invention discloses a flushing device, including an anti-backflow valve and the aforementioned automatic positive pressure sealing device. The anti-backflow valve is located at the liquid outlet. The anti-backflow valve has an inner cavity, and the liquid supply mechanism has a micro-hole communicating with the inner cavity. As the piston gradually moves toward the liquid outlet under the abutment of the elastic element, the liquid in the liquid storage space enters the inner cavity through the micro-hole. When the liquid pressure in the inner cavity reaches a preset value, the anti-backflow valve opens, allowing the liquid in the inner cavity to be released from the liquid outlet to the intravenous catheter for flushing.

[0018] As an optional implementation, the diameter of the micropore is 0.001 mm to 0.1 mm, and / or the preset value is 1 kPa to 5 kPa.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] (1) The piston is movably disposed within the receiving cavity of the liquid storage tube. The space between the piston and the outlet is the liquid storage space, and an elastic element is provided between the push rod and the piston. When the push rod moves toward the piston, the elastic element absorbs the mechanical energy of the push rod and stores it as elastic potential energy. Under the action of the elastic potential energy of the elastic element, the piston squeezes the liquid storage space, causing the liquid used for sealing the tube in the liquid storage space to be discharged from the outlet. By slowly releasing the elastic potential energy using the elastic element, the piston can apply pressure to the liquid in the liquid storage tube for a long time, so that the hydraulic pressure in the liquid storage tube can be kept in a positive pressure state relative to the human blood pressure for a longer time, preventing blood from flowing back into the venous catheter.

[0021] (2) The piston is movably disposed in the receiving cavity. When the push rod moves toward the piston, the liquid reservoir will restrict the degree of freedom of the push rod, so that the push rod remains in the current position. This is conducive to the elastic element releasing elastic potential energy in the direction closer to the piston, so that the elastic potential energy of the elastic element can be fully applied to the piston.

[0022] (3) Easy to operate. According to actual needs, the push rod can be moved a certain distance relative to the liquid storage tube in the direction of the piston to realize the automatic sealing operation, which simplifies the sealing operation steps. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of the liquid supply mechanism of the present invention;

[0025] Figure 2 This is a cross-sectional view of the liquid supply mechanism of the present invention;

[0026] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a thumbnail diagram of the push rod and liquid storage tube of the present invention;

[0028] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0029] Figure 6 This is a first state diagram of the automatic positive pressure sealing device of the present invention;

[0030] Figure 7 This is a second state diagram of the automatic positive pressure sealing device of the present invention;

[0031] Figure 8 This is a third state diagram of the automatic positive pressure sealing device of the present invention;

[0032] Figure 9 This is a first structural diagram of the automatic positive pressure sealing device of the present invention;

[0033] Figure 10 This is a second structural diagram of the automatic positive pressure sealing device of the present invention;

[0034] Figure 11 This is a thumbnail diagram of the venous catheter of the present invention;

[0035] Figure 12 This is a cross-sectional view of the flushing device of the present invention;

[0036] Figure 13 yes Figure 12 Enlarged view of point C in the middle.

[0037] Explanation of key figure labels:

[0038] 1. Liquid supply mechanism; 11. Liquid storage tube; 111. First limiting rib; 12. Push rod; 121. First limiting groove; 122. Second limiting rib; 123. Racket; 124. Bayonet; 125. Scale value; 13. Liquid outlet; 131. Micro-hole; 14. Piston; 141. Piston head; 142. Second limiting groove; 15. Elastic element; 16. Receiving cavity; 161. Liquid storage space; 17. Anti-backflow valve; 171. Inner cavity;

[0039] 2. Liquid dispensing mechanism; 21. Switch; 22. First connector; 221. Outer pipe; 222. Inner pipe; 23. Second connector; 24. Branch pipe; 241. Main pipe; 2411. Second pipe clamp; 242. Branch pipe; 2421. First pipe clamp;

[0040] 3. Intravenous catheter; 31. Connecting part;

[0041] D. Preset direction. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to include a specific orientation, or to be constructed and operated in a specific orientation.

[0044] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0045] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0046] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0047] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0048] Please see Figures 1 to 2 As shown, this application provides an automatic positive pressure sealing device, including a liquid supply mechanism 1. The liquid supply mechanism 1 includes a liquid storage tube 11 and a pushing component. The liquid storage tube 11 is used to store liquid for sealing. The liquid storage tube 11 has a receiving cavity 16 and a liquid outlet 13 that are interconnected. The pushing component is disposed in the receiving cavity 16. The liquid outlet 13 is used to communicate with a venous catheter 3 that is connected to a human blood vessel.

[0049] The actuating component drives the reservoir 11 to release the liquid used for sealing through the outlet 13. The liquid used for sealing is typically physiological saline, heparinized saline, etc. The storage function of the reservoir 11 ensures a sufficient supply of liquid during the sealing operation, guaranteeing its smooth execution.

[0050] The actuating assembly includes a piston 14, an elastic element 15, and a push rod 12. The piston 14 is movably disposed within a receiving cavity 16, and the receiving cavity 16 between the piston 14 and the outlet 13 constitutes a liquid storage space 161 for storing liquid. As the piston 14 moves within the liquid storage tube 11, the volume of the liquid storage space 161 changes accordingly. When the piston 14 reduces the volume of the liquid storage space 161, pressure is applied to the liquid within the liquid storage tube 11, creating a positive pressure environment. Under this positive pressure environment, liquid can continuously flow into the venous catheter 3, creating a positive pressure relative to the body's blood vessels within the venous catheter 3, thereby preventing blood from flowing back into the venous catheter 3.

[0051] The push rod 12 is located on the side of the piston 14 opposite to the outlet 13. The push rod 12 is movably disposed within the receiving cavity 16, and an elastic element 15 is provided between the push rod 12 and the piston 14. When the push rod 12 moves toward the outlet 13, the elastic element 15 is compressed under the action of the push rod 12, and the piston 14 gradually moves toward the outlet 13 under the abutment of the elastic element 15. The operation is simple. According to actual needs, the push rod 12 can be moved a certain distance relative to the reservoir tube 11 in the direction toward the piston 14 to achieve the tube sealing operation, so that a positive pressure relative to the human blood pressure is formed in the intravenous catheter 3.

[0052] The mechanical energy of the push rod 12 when it moves is converted into the stable elastic potential energy of the elastic element 15. The elastic element 15 slowly releases the elastic potential energy, so that the piston 14 can apply pressure to the liquid in the reservoir tube 11 for a long time, so that the liquid in the reservoir tube 11 and the venous catheter 3 is in a long-term positive pressure state, and the hydraulic pressure in the reservoir tube 11 can be in a positive pressure state relative to the human blood pressure for a long time, preventing blood from flowing back into the venous catheter 3.

[0053] After the push rod 12 moves a certain distance along the preset direction D, the liquid reservoir 11 will restrict the degree of freedom of the push rod 12, providing a structural basis for the elastic element 15 to remain in a compressed state. The preset direction D mentioned here is the direction in which the push rod 12 moves closer to the piston 14.

[0054] When push rod 12 moves toward piston 14, reservoir tube 11 restricts the degree of freedom of push rod 12, keeping push rod 12 in its current position. This facilitates the release of elastic potential energy of elastic element 15 toward piston 14, ensuring that the elastic potential energy of elastic element 15 is fully applied to piston 14.

[0055] The sealing operation is simplified. The user can move the push rod 12 a certain distance relative to the reservoir tube 11 in the direction toward the piston 14 according to the actual needs, so that the hydraulic pressure in the reservoir tube 11 can be kept in a positive pressure state relative to human blood pressure for a longer period of time, thus simplifying the sealing operation steps.

[0056] Please see Figure 2 As shown, in some embodiments, the push rod 12 is provided with a first limiting groove 121, the piston 14 is provided with a second limiting groove 142, and the two opposite ends of the elastic element 15 are respectively provided in the first limiting groove 121 and the second limiting groove 142. The first limiting groove 121 and the second limiting groove 142 are coaxial, so that the deformation direction of the elastic element 15 is parallel to the movement direction of the push rod 12.

[0057] The first limiting groove 121 and the second limiting groove 142 provide a clear installation position and limiting space for the elastic element 15, effectively preventing the elastic element 15 from shifting or misaligning between the push rod 12 and the piston 14. The first limiting groove 121 and the second limiting groove 142 limit the elastic element 15, ensuring that the elastic element 15 remains parallel to the moving direction of the push rod 12 during the extension and retraction process, thereby guiding the push rod 12 to move along the preset direction D. This avoids the push rod 12 from shifting or wobbling during movement, making the operation more stable and controllable.

[0058] The elastic element 15 abuts against the push rod 12 and the piston 14 at opposite ends. When the user pushes the push rod 12, the push rod 12 can accurately transmit the applied force to the elastic element 15, which then transmits it to the piston 14. Since the extension and retraction direction of the elastic element 15 is parallel to the movement direction of the push rod 12, the force transmission path is direct and efficient, reducing force loss and dispersion, and ensuring that the piston 14 can more effectively squeeze the liquid in the liquid storage space 161. The elastic element 15 mentioned here is generally a spring or a component made of a good elastic material such as PU or rubber.

[0059] As push rod 12 moves along the preset direction D, elastic element 15 is compressed, storing elastic potential energy. Subsequently, elastic element 15 slowly releases the stored elastic potential energy, pushing piston 14 to continue moving, ensuring a positive pressure environment within the liquid storage space 161, allowing liquid to flow out of outlet 13. This mechanism of storing and releasing elastic potential energy makes the sealing operation smoother and more consistent, helping to maintain stable liquid output and improve the sealing effect.

[0060] The elastic potential energy stored in the elastic element 15 can continue to push the piston 14 after the push rod 12 stops moving, applying continuous pressure to the liquid in the reservoir tube 11, thereby maintaining a positive pressure environment. This positive pressure environment helps prevent blood from flowing back into the venous catheter 3, reducing the risk of blockage of the venous catheter 3 and ensuring the effectiveness of the catheter sealing.

[0061] Please see Figure 2 As shown, in some embodiments, a piston head 141 is fitted onto the side of the piston 14 away from the push rod 12. The piston head 141 is in direct contact with the liquid in the reservoir tube 11 and prevents the liquid from seeping into the side of the piston 14 closer to the push rod 12.

[0062] During the sealing procedure, leakage of fluid can lead to waste of medication or flushing solution, increasing medical costs. The piston head 141 is typically made of highly elastic PP, PU, ​​or rubber. It is interference-fitted into the reservoir tube 11, ensuring a tight seal and helping to maintain stable pressure within the reservoir space 161. As the push rod 12 pushes the piston 14 to expel fluid, the pressure within the reservoir space 161 gradually increases. Stable pressure is crucial for ensuring that fluid flows smoothly through the intravenous catheter 3 into the patient at an appropriate flow rate and pressure. The piston head 141 prevents leakage, allowing the hydraulic pressure within the reservoir space 161 to accumulate gradually as expected. This ensures the stability and effectiveness of fluid delivery during the sealing process, preventing pressure fluctuations that could hinder fluid delivery and prevent the formation of a stable positive pressure environment within the reservoir space 161.

[0063] The piston head 141 also prevents external impurities from entering the liquid storage space 161. During the use of the liquid supply mechanism 1, dust, microorganisms, and other impurities from the external environment may enter the liquid storage space 161, contaminating the liquid and affecting the sealing effect and the patient's health. The piston head 141 is in direct contact with the liquid in the liquid storage space 161, forming a barrier that effectively prevents impurities from entering, ensuring the purity of the liquid in the liquid storage space 161, and further improving the safety and effectiveness of the sealing operation.

[0064] Please see Figure 3 As shown, in some embodiments, the inner wall of the liquid storage tube 11 is provided with at least one first limiting rib 111, and the push rod 12 is provided with a second limiting rib 122 that cooperates with the first limiting rib 111. During the movement of the push rod 12 along the preset direction D, if the second limiting rib 122 cooperates with the first limiting rib 111, the first limiting rib 111 will prevent the push rod 12 from moving away from the piston 14.

[0065] A stable position of the push rod 12 is crucial for the continuous accumulation of liquid pressure. Through the cooperation of the first limiting rib 111 and the second limiting rib 122, the elastic element 15 can be continuously compressed, allowing the liquid pressure to rise steadily and continuously. This ensures the subsequent release of liquid at an appropriate pressure, contributing to improved sealing performance. The cooperation of the first limiting rib 111 and the second limiting rib 122 effectively prevents the push rod 12 from moving away from the piston 14, ensuring that the push rod 12 remains in the appropriate position to push the piston 14, thus guaranteeing the stable operation of the entire sealing process.

[0066] Please see Figures 4 to 5 As shown, in some embodiments, the push rod 12 is provided with a ratchet 123 that engages with the first limiting rib 111. Through the engagement of the ratchet 123 and the first limiting rib 111, the push rod 12 moves unidirectionally toward the piston 14.

[0067] The unidirectional engagement between the ratchet 123 and the first limiting rib 111 allows the operator to more precisely control the distance the push rod 12 moves towards the piston 14. Because it can only move in one direction, the operator does not need to worry about the push rod 12 accidentally retracting when pushing it, thus allowing for more accurate compression of the elastic element 15 according to actual needs. This, in turn, enables more precise control over the subsequent liquid pressure and the amount of liquid released, improving the accuracy of the sealing operation.

[0068] Please see Figure 5 As shown, in some embodiments, the ratchet teeth 123 are continuously distributed along the length of the push rod 12, and the ratchet teeth 123 are provided with no less than two latches 124, with the multiple latches 124 being evenly spaced; the push rod 12 is provided with a scale value 125 corresponding to the position of the latches 124, and the scale value 125 is used to indicate the displacement of the push rod 12.

[0069] Different patients have different vascular conditions, types of intravenous catheters, and degrees of blockage, resulting in varying requirements for fluid pressure and release volume. The combination of scale value 125 and the locking point 124 allows operators to select the appropriate locking point 124 position based on the actual situation, enabling personalized catheter sealing operations and improving treatment effectiveness and safety.

[0070] Multiple evenly spaced locking tabs 124 provide operators with several clearly defined positioning points. Operators can precisely lock the push rod 12 into different locking tab positions according to specific sealing requirements, thereby accurately controlling the displacement of the push rod 12. By controlling the displacement of the push rod 12, the compression degree of the elastic element 15 can be precisely adjusted, thereby precisely controlling the subsequent fluid pressure and fluid release volume, meeting the personalized sealing needs of different patients and different intravenous catheters 3.

[0071] In some embodiments, the push rod 12 is threadedly connected to the reservoir tube 11. By controlling the rotation direction of the push rod 12, the displacement of the push rod 12 relative to the reservoir tube 11 along the direction close to the piston 14 can be changed.

[0072] The threaded connection features self-locking and precise pitch, allowing the push rod 12 to move in highly precise increments during rotation. For each rotation of a certain angle, the push rod 12 moves a fixed distance along a preset direction D. The threaded connection ensures that the displacement of the push rod 12 remains consistent with each rotation of the same number of turns or angle, exhibiting excellent repeatability. This means that medical personnel can accurately control the position of the push rod 12 during multiple operations to precisely control the duration of the positive pressure fluid environment.

[0073] The self-locking property of the threaded connection can, to some extent, prevent the push rod 12 from accidentally displacing due to accidental collisions, vibrations, or other factors. During the sealing process, if the push rod 12 moves unexpectedly, it may lead to abnormal fluid delivery, affecting the sealing effect and even causing harm to the patient. The self-locking characteristic of the threaded connection increases operational safety and reduces the occurrence of accidents.

[0074] Displacement is controlled by rotating push rod 12. The user can perceive the movement of push rod 12 in real time and can stop or adjust the rotation direction at any time as needed to adjust the elastic potential energy between push rod 12 and piston 14, thereby adjusting the duration of the positive pressure liquid environment in the liquid storage tube 11 in real time.

[0075] Please see Figures 6 to 8 The diagram shows the first, second, and third states of the fluid supply mechanism 1. In the first state, the elastic element 15 between the push rod 12 and the piston 14 is not deformed or its deformation is insufficient to counteract the static friction between the piston 14 and the reservoir tube 11. At this time, the piston 14 cannot compress the liquid in the reservoir tube 11, and the liquid cannot be discharged from the fluid supply mechanism 1. In the second state, the push rod 12 moves a certain distance along a preset direction D, and the first limiting rib 111 and the second limiting rib 122 engage, keeping the push rod 12 in a relatively stationary position relative to the reservoir tube 11. At this time, the mechanical energy of the push rod 12 during movement is converted into elastic potential energy that compresses the elastic element 15. Under the rebound action of the elastic element 15, the piston 14 tends to compress the liquid inside the reservoir tube 11. That is, during the rebound of the elastic element 15, pressure is continuously applied to the liquid in the reservoir space 161 to create a positive pressure environment within the intravenous catheter 3. After the liquid in the storage space 161 is released, the liquid supply mechanism 1 reaches the third state. In the third state, under the action of the elastic element 15, the piston 14 has moved relative to the push rod 12 along the preset direction D to abut against the storage tube 11, so that the liquid is completely discharged from the liquid outlet 13 from the liquid supply mechanism 1.

[0076] Please see Figures 9 to 10 As shown, in some embodiments, the automatic positive pressure sealing device further includes a liquid dispensing mechanism 2. The liquid supply mechanism 1 is connected to the intravenous catheter 3 through the liquid dispensing mechanism 2. The intravenous catheter 3 is used to transport liquid into the human body. The liquid dispensing mechanism 2 includes a first connector 22 and a second connector 23. The first connector 22 is connected to the intravenous catheter 3, and the second connector 23 is used to transport external liquid into the liquid dispensing mechanism 2. The liquid dispensing mechanism 2 is used to control the connection of the intravenous catheter 3 to an external liquid source or the liquid supply mechanism 1.

[0077] The second connector 23 of the dispensing mechanism 2 can be used to transport external liquids into the dispensing mechanism 2, enabling the entire system to deliver multiple types of liquids. In addition to the liquids originally stored in the supply mechanism 1 for sealing, such as physiological saline and heparinized saline, other external drug liquids with different functions can also be introduced through the second connector 23. Users can flexibly choose to input different liquids through the second connector 23 to achieve diversified treatment methods, expanding the application scenarios and functions of the equipment.

[0078] In some embodiments, the dispensing mechanism 2 includes a three-way valve, which is connected to the liquid supply mechanism 1, the first connector 22, and the second connector 23. The three-way valve is provided with a switch 21, which is used to control the opening and closing of the liquid delivery path between the liquid supply mechanism 1 and the intravenous catheter 3, or the opening and closing of the liquid delivery path between the second connector 23 and the intravenous catheter 3.

[0079] The three-way valve integrates a liquid supply mechanism 1, a first connector 22, and a second connector 23. A single switch 21 controls the on / off state of different liquid delivery paths. Users can easily select and switch between different liquid delivery paths simply by operating the switch 21 on the three-way valve, thus improving operational efficiency.

[0080] The combination of the three-way valve and switch 21 provides a high degree of flexibility in the fluid delivery path. During infusion, the fluid delivery path can be switched at any time by operating switch 21, depending on the different treatment stages and the patient's condition. For example, when it is necessary to seal the intravenous catheter 3, switch 21 is adjusted to open the fluid delivery path between the infusion supply mechanism 1 and the intravenous catheter 3, allowing the fluid in the infusion supply mechanism 1 to be delivered to the intravenous catheter 3 for sealing. When it is necessary to administer external medication fluids, simply operate switch 21 to open the fluid delivery path between the second connector 23 and the intravenous catheter 3, allowing the external fluid to be delivered to the intravenous catheter 3 and into the body. This flexible switching function meets diverse infusion needs.

[0081] Please see Figure 10 As shown, in some embodiments, the dispensing mechanism 2 includes a branch pipe 24, which includes a main pipe 241 and a branch pipe 242. The two ends of the main pipe 241 are respectively provided with a first connector 22 and a second connector 23. One end of the branch pipe 242 is connected to the main pipe 241, and the other end is connected to the sealing mechanism. A first clamp 2421 is provided on the branch pipe 242, which is used to control the opening and closing of the liquid delivery path between the sealing mechanism and the main pipe 241. A second clamp 2411 is provided at the end of the main pipe 241 near the second connector 23, which is used to control the opening and closing of the liquid delivery path from the external liquid source to the first connector 22 of the venous catheter 3.

[0082] The main pipe 241 serves as a common channel, with its first connector 22 and second connector 23 at both ends forming a basic liquid passage. The branch pipe 242 serves as a functional branch, with one end connected to the main pipe 241 and the other end connected to the sealing mechanism, forming an independent dedicated sealing passage.

[0083] When the first clamp 2421 is closed, the liquid delivery path of the liquid supply mechanism 1 is cut off. At this time, external medicine can be introduced through the second connector 23 and delivered to the intravenous catheter 3. Then, the intravenous catheter 3 is inserted into the human blood vessel, realizing precise control of the delivery of liquids from different sources and meeting diverse infusion needs.

[0084] When the second clamp 2411 is closed, the fluid delivery path between the first connector 22 and the second connector 23 is cut off, allowing the fluid in the supply mechanism 1 to be delivered to the intravenous catheter 3. This prevents the sealing fluid from mixing with external fluids, ensuring the purity and dosage accuracy of the sealing fluid.

[0085] Please see Figure 11 As shown, in some embodiments, the connection portion 31 of the venous catheter 3 is threadedly connected to the outer tube 221.

[0086] The threaded connection provides strong mechanical clamping force, ensuring a tight fit between the connection portion 31 of the intravenous catheter 3 and the outer tube 221. During the sealing process, the fluid flow generates pressure and impact forces; the threaded connection ensures that the intravenous catheter 3 and the outer tube 221 will not easily separate, guaranteeing the reliability of the connection between the intravenous catheter 3 and the first connector 22. The threaded connection also provides excellent sealing; when the connection portion 31 of the intravenous catheter 3 is tightened with the outer tube 221, the tight fit between the threads effectively prevents fluid leakage from the connection point.

[0087] Please see Figure 12 As shown, in some embodiments, the first connector 22 includes an inner tube 222 and an outer tube 221 that are coaxially fixed together. The inner tube 222 is connected to the venous catheter 3, and the outer tube 221 is detachably connected to the venous catheter 3.

[0088] The detachable outer tube 221 and the intravenous catheter 3 make it easier to connect or disconnect the intravenous catheter 3 from the first connector 22. Users can quickly connect the intravenous catheter 3 to the first connector 22 to begin fluid delivery according to actual infusion needs; when treatment is completed or the intravenous catheter 3 needs to be replaced, it can also be quickly disconnected from the first connector 22, improving operational efficiency and saving time.

[0089] When the outer tube 221 is connected to the venous catheter 3, it ensures that the venous catheter 3 and the inner tube 222 are accurately coaxially aligned, allowing the fluid to flow smoothly into the venous catheter 3 through the inner tube 222, reducing problems such as poor fluid flow or leakage caused by misalignment of the connection.

[0090] Please see Figure 12 and Figure 13 As shown, in some embodiments, the present invention discloses a flushing device, including an anti-backflow valve 17 and the aforementioned automatic positive pressure sealing device. The anti-backflow valve 17 is located at the outlet 13. The anti-backflow valve 17 has an inner cavity 171, and the outlet 13 is provided with a micro-hole 131 communicating with the inner cavity 171. As the piston 14 gradually moves toward the outlet 13 under the abutment of the elastic member 15, the liquid in the storage space 161 enters the inner cavity 171 through the micro-hole 131. When the liquid pressure in the inner cavity 171 reaches a preset value, the anti-backflow valve 17 opens, allowing the liquid in the inner cavity 171 to be released from the outlet 13 to the intravenous catheter 3 for flushing.

[0091] Under positive pressure, the liquid in the reservoir 11 passes through the micro-hole 131 and enters the inner cavity 171. The liquid remains stored in the inner cavity 171 until the internal pressure reaches a preset value. Once the internal pressure reaches the preset value, the liquid is rapidly released from the supply mechanism 1. Immediately, the internal pressure drops below the preset value, causing the inner cavity 171 to re-enter the liquid storage phase. This cycle of liquid storage and release within the inner cavity 171 creates a pulsed flushing operation. This pulsed flushing operation generates discontinuous impact forces on the inner wall of the venous catheter 3, helping to loosen and flush away attached drug residues, blood clots, or lipid deposits, reducing the probability of venous catheter 3 blockage and improving the efficiency of the flushing operation.

[0092] In some embodiments, the diameter of the micro-hole 131 is 0.001mm-0.1mm, and the specific value of the diameter of the micro-hole 131 includes, but is not limited to, 0.001mm, 0.005mm, 0.01mm, 0.05mm, and 0.1mm.

[0093] The diameter range of the micro-orifice 131 determines the cross-sectional area through which the liquid passes, thereby precisely controlling the flow rate of the liquid entering the inner cavity 171. The micro-orifice 131, with a diameter range of 0.001 mm to 0.1 mm, ensures that the liquid can only enter the inner cavity 171 at a slow and stable speed.

[0094] In some embodiments, the preset value range is 1 kPa to 5 kPa, and the specific values ​​of the preset value include, but are not limited to, 1 kPa, 2 kPa, 3 kPa, 4 kPa, and 5 kPa.

[0095] When the fluid pressure inside the lumen 171 reaches the reasonable range of 1 kPa-5 kPa, the fluid is released rapidly. This ensures that there is enough fluid to be transported to the venous catheter 3 for sufficient flushing, while also preventing the fluid from flowing into the venous catheter 3 and causing excessive pressure, which could cause discomfort to the patient.

[0096] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. An automatic positive pressure pipe sealing device, characterized by, The application relates to a liquid supply device, which comprises a liquid storage tube and a pushing assembly. The pushing assembly comprises a piston and a pushing rod. The piston is movably arranged in the accommodating cavity. The pushing rod is movably arranged in the accommodating cavity and is provided with an elastic member between the pushing rod and the piston. When the pushing rod moves towards the piston, the liquid storage tube limits the freedom of the pushing rod, so that the pushing rod is kept in the current position, the elastic member is compressed under the action of the pushing rod, the piston gradually moves towards the liquid outlet under the abutting action of the elastic member, the liquid pressure in the liquid storage space is continuously discharged into the venous catheter through the liquid outlet, and the internal liquid pressure of the venous catheter keeps a positive pressure state relative to the human blood pressure.

2. The automatic overpressure tube-closing device according to claim 1, characterized in that The inner wall of the liquid storage tube is provided with at least one first limiting rib, and the pushing rod is provided with a second limiting rib matched with the first limiting rib.

3. The automatic overpressure tube-closing device according to claim 1, characterized in that During the movement of the pushing rod towards the piston, if the second limiting rib is matched with the first limiting rib, the first limiting rib will hinder the movement of the pushing rod away from the piston.

4. The automatic overpressure tube-closing device according to any one of claims 1 to 3, characterized in that The pushing rod is provided with a ratchet matched with the first limiting rib.

5. The automatic overpressure tube sealing device according to claim 4, characterized in that The ratchet is continuously distributed along the length direction of the pushing rod. The pushing rod is provided with a scale value corresponding to the position of the ratchet. The pushing rod and the inner wall of the liquid storage tube are connected through threads. The pushing rod is rotated to move the pushing rod relative to the liquid storage tube towards the piston. The liquid supply device comprises a liquid distribution mechanism. The liquid distribution mechanism is connected with the liquid supply device. The liquid distribution mechanism comprises a first connector and a second connector. The first connector is connected with the venous catheter. The second connector is used for connecting an external liquid source. The liquid distribution mechanism is used for controlling the connection of the venous catheter with the external liquid source or the liquid supply device. The liquid distribution mechanism comprises a three-way valve. The three-way valve is connected with the liquid supply device, the first connector and the second connector. The three-way valve is provided with a switch. The switch is used for controlling the on-off of the liquid conveying path between the liquid supply device and the venous catheter or the liquid conveying path between the external liquid source and the first connector.

6. The automatic overpressure tube sealing device according to claim 4, characterized in that The liquid distribution mechanism comprises a bifurcated pipe, the bifurcated pipe comprises a main pipe and a branch pipe, two ends of the main pipe are respectively provided with the first joint and the second joint; one end of the branch pipe is communicated with the main pipe, and the other end is communicated with the liquid supply mechanism; the branch pipe is provided with a first pipe clamp, the first pipe clamp is used for controlling the on-off of the liquid conveying path between the liquid supply mechanism and the main pipe; one end of the main pipe close to the second joint is provided with a second pipe clamp, the second pipe clamp is used for controlling the on-off of the liquid conveying path between the external liquid source and the first joint.

7. The automatic overpressure tube-closing device according to any one of claims 5-6, characterized in that, The first joint comprises a coaxially fixed inner pipe and an outer pipe, the inner pipe is communicated with the venous catheter, and the outer pipe is detachably connected with the venous catheter.

8. A flush pipe device, characterized by The automatic positive pressure pipe sealing device comprises a reverse prevention valve and the automatic positive pressure pipe sealing device of any one of claims 1-7, the reverse prevention valve is arranged at the liquid outlet; the reverse prevention valve has an inner cavity, and the liquid outlet is provided with a micro hole communicated with the inner cavity; in the process that the piston gradually moves towards the liquid outlet under the abutting action of the elastic member, the liquid in the liquid storage space enters the inner cavity through the micro hole, and when the liquid pressure in the inner cavity reaches a preset value, the reverse prevention valve is opened, so that the liquid in the inner cavity is released from the liquid outlet to the venous catheter to flush the pipe.

9. The mouthpiece device of claim 8, wherein, The diameter of the micro hole is 0.001mm-0.1mm, and / or the preset value is 1Kpa-5Kpa.

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