Self-sealing infusion set
By improving the structure of the venting assembly and using materials such as hydrophilic membranes, hydrophobic membranes, composite membranes, or foamed balls to achieve self-sealing, the problem of air entering after venting in existing infusion sets has been solved, improving the safety and ease of operation of the infusion set.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI HONGDA MEDICAL EQUIP GROUP
- Filing Date
- 2025-03-06
- Publication Date
- 2026-06-19
AI Technical Summary
Existing infusion sets are prone to air entering the drip chamber after venting, causing the medication in the drip chamber to drop or even run out. In addition, the operation is cumbersome and poses safety hazards.
An improved venting assembly, including hydrophilic membranes, hydrophobic membranes, composite membranes, breathable blocks, or foamed balls, is used and is attached to the venting needle by heat welding or ultrasonic welding to achieve a self-sealing effect and prevent air from entering the drip chamber.
It achieves automatic sealing after self-venting, preventing air from entering the drip chamber, avoiding the drop of medicine in the drip chamber, improving safety and ease of operation, and eliminating particulate contamination.
Smart Images
Figure CN224370353U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of infusion set technology, specifically to an infusion set that self-vents air and then self-closes. Background Technology
[0002] With the development of medical technology, disposable infusion sets have evolved into many functional structures, such as infusion sets with precision filtration, infusion sets with self-venting function, infusion sets with self-stopping function, and infusion sets with anti-backflow function.
[0003] Patent CN201010123045.X discloses a safe, bubble-free infusion set. This infusion set has an venting assembly consisting of a venting needle and an air filter above the drip chamber. During the venting phase of infusion, the air inside the drip chamber can be expelled through the venting assembly, so that the liquid level in the drip chamber can automatically rise, achieving the function of self-venting and eliminating the need for cumbersome squeezing or inverting of the drip chamber to vent air in clinical practice.
[0004] However, the aforementioned infusion set presents certain risks during use: When air is released before infusion, air inside the drip chamber is expelled through the venting assembly, causing the liquid level to rise automatically. During infusion, air can also enter the drip chamber through the venting assembly, preventing or slowing out the medication in the upper vial. As medication continues to be infused, the liquid level in the drip chamber will drop, and even after the medication is exhausted (the drip chamber is empty), air entering through the venting assembly can enter the body through the drip chamber and the tubing below. Although a stopper can be installed on the air filter to prevent air from entering the drip chamber through the venting assembly after venting, the cumbersome process of closing the stopper makes the self-venting function of the infusion set inconvenient. Furthermore, during clinical use, medical staff may easily forget to close the stopper, allowing air to enter the drip chamber through the venting assembly. Utility Model Content
[0005] Therefore, the purpose of this utility model is to provide an infusion set that is self-sealing after venting, so that after venting, it can automatically prevent air from entering the drip chamber from the outside.
[0006] In a first aspect, this utility model provides an infusion set that is self-venting and self-sealing, comprising an air inlet device, a bottle stopper puncturist, an upper short tube, a drip cap, a drip chamber, a long tubing, a flow regulator, an injection piece, a drug solution filter, and an intravenous infusion needle connected in sequence. The drip cap is provided with an air venting assembly, which includes an air venting needle located inside the drip cap and an air venting protrusion located on the top of the drip cap.
[0007] The exhaust protrusion has a receiving groove that communicates with the exhaust needle. The receiving groove is stepped, with a hydrophilic membrane on the bottom step by hot welding or ultrasonic welding, and a hydrophobic membrane on the top step by hot welding or ultrasonic welding.
[0008] Furthermore, the hydrophilic membrane is made of hydrophilically treated polyethersulfone, polypropylene, polyester, nylon, polyester fiber, or cellulose ester.
[0009] Furthermore, the hydrophobic membrane is made of hydrophobically treated glass fiber, polypropylene, polyester, polytetrafluoroethylene or polyvinylidene fluoride.
[0010] Furthermore, the top of the dripping container cover is provided with a clamping post.
[0011] Secondly, this utility model provides an infusion set that is self-venting and self-sealing, comprising an air inlet device, a bottle stopper puncturist, an upper short tube, a drip cap, a drip chamber, a long tubing, a flow regulator, an injection piece, a drug solution filter, and an intravenous infusion needle connected in sequence. The drip cap is provided with an air venting assembly, which includes an air venting needle located inside the drip cap and an air venting protrusion located on the top of the drip cap.
[0012] The exhaust protrusion has a receiving groove communicating with the exhaust needle, and the receiving groove has a composite membrane and an exhaust plug.
[0013] The composite membrane is a microporous membrane with a hydrophilic bottom surface and a hydrophobic top surface;
[0014] The vent plug is glued to the receiving groove and its bottom presses against the periphery of the composite membrane.
[0015] Thirdly, this utility model provides an infusion set that is self-venting and self-sealing, comprising an air inlet device, a bottle stopper puncturist, an upper short tube, a drip cap, a drip chamber, a long tubing, a flow regulator, an injection piece, a drug solution filter, and an intravenous infusion needle connected in sequence. The drip cap is provided with an air venting assembly, which includes an air venting needle located inside the drip cap and an air venting protrusion located on the top of the drip cap.
[0016] The exhaust protrusion has a receiving groove that communicates with the exhaust needle, and the receiving groove has a vent block. The vent block and the receiving groove are interference fit.
[0017] The lower half of the breathable block is hydrophilic, while the upper half is hydrophobic.
[0018] Furthermore, the breathable block is made of high-density polyethylene and ultra-high molecular weight polyethylene through sintering.
[0019] Fourthly, this utility model provides an infusion set that is self-venting and self-sealing, comprising an air inlet device, a bottle stopper puncturist, an upper short tube, a drip cap, a drip chamber, a long tubing, a flow regulator, an injection piece, a drug solution filter, and an intravenous infusion needle connected in sequence. The drip cap is provided with an air venting assembly, which includes an air venting needle located inside the drip cap and an air venting protrusion located on the top of the drip cap.
[0020] The exhaust protrusion has a receiving groove that communicates with the exhaust needle, and the bottom of the receiving groove has a cavity;
[0021] The bottom of the receiving tank is provided with a hydrophobic membrane by thermal welding or ultrasonic welding, and the cavity is provided with foaming balls.
[0022] Furthermore, the foamed ball is made of sodium polyacrylate.
[0023] Furthermore, the bottom of the cavity is provided with an exhaust groove, and the diameter of the cavity is larger than the diameter of the exhaust hole in the exhaust needle, but smaller than the diameter of the foaming ball.
[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0025] By improving the structure of the venting assembly, the hydrophobic membrane achieves a self-sealing effect on the venting holes in the venting core after venting, effectively preventing air from entering the infusion set during infusion, thus avoiding the dangers of the drip chamber running dry or even air entering the body. Simultaneously, the self-sealing feature completely eliminates the possibility of airborne particles contaminating the medication in the infusion set, making it safe, reliable, and easy to operate. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of the infusion set of this utility model that self-vents air and then self-closes.
[0027] Figure 2 This is a schematic diagram of the structure of the dripping funnel cover and the exhaust assembly in the first embodiment of this utility model;
[0028] Figure 3 This is a schematic diagram of the structure of the dripping funnel cover and the exhaust assembly in the second embodiment of this utility model;
[0029] Figure 4 This is a schematic diagram of the structure of the dripping funnel cover and the exhaust assembly in the third embodiment of this utility model;
[0030] Figure 5 This is a schematic diagram of the structure of the dripping funnel cover and the exhaust assembly in the fourth embodiment of this utility model.
[0031] Explanation of key component symbols:
[0032] 10-Air inlet device; 11-Bottle stopper puncture device; 12-Upper short tube; 13-Drip chamber cap; 131-Exhaust assembly; 1311-Exhaust needle; 1312-Exhaust boss; 1313-Receiving groove; 1313a-Receiving groove; 1313b-Receiving groove; 1313c-Receiving groove; 1314-Hydrophilic membrane; 1315-Hydrophobic membrane; 1315c-Hydrophobic membrane; 1316-Composite membrane; 1317-Exhaust plug; 1318-Air permeable block; 1319-Foaming ball; 132-Clipping column; 14-Drip chamber; 15-Long catheter; 16-Flow regulator; 17-Injection piece; 18-Drug solution filter; 19-Intravenous infusion needle.
[0033] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation
[0034] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.
[0035] Please see Figure 1 An embodiment of this utility model provides a self-venting and self-sealing infusion set, comprising an air inlet device 10, a bottle stopper puncturer 11, an upper short tube 12, a drip cap 13, a drip 14, a long tubing 15, a flow regulator 16, an injection piece 17, a drug solution filter 18, and an intravenous infusion needle 19 connected in sequence. The drip cap 13 is provided with a venting assembly 131, which includes a venting needle 1311 located inside the drip cap 13 and a venting protrusion 1312 located on the top of the drip cap 13.
[0036] Please see Figure 1 and Figure 2 In a preferred embodiment of this application, the exhaust protrusion 1312 is provided with a receiving groove 1313 communicating with the exhaust needle 1311. The receiving groove 1313 is stepped, with a hydrophilic membrane 1314 welded to the bottom step by heat welding or ultrasonic welding, and a hydrophobic membrane 1315 welded to the top step by heat welding or ultrasonic welding.
[0037] Furthermore, the hydrophilic membrane 1314 is made of hydrophilically treated polyethersulfone, polypropylene, polyester, nylon, polyester fiber or cellulose ester, or it can be made of composite materials.
[0038] Furthermore, the hydrophobic membrane 1315 is made of hydrophobically treated glass fiber, polypropylene, polyester, polytetrafluoroethylene or polyvinylidene fluoride, or it can be made of composite materials.
[0039] Please see Figure 1The top of the drip chamber cap 13 is provided with a clamping post 132. The inner slit of the clamping post 132 can be used to temporarily clamp the thin tube in which the intravenous infusion needle 19 is placed.
[0040] It should be noted that, in this embodiment, during use, the infusion set can be folded in half and the thin tube of the intravenous infusion needle 19 can be clamped inside the clamping post 132 to prevent the infusion set from being too long and dragging to the ground. After the infusion set stopper puncturist 11 is inserted into the medicine container, the medicine flows into the drip chamber 14 through the upper short tube 12. The air in the drip chamber 14 is expelled from the infusion set in sequence through the venting needle 1311, the hydrophilic membrane 1314, and the hydrophobic membrane 1315. Without squeezing the drip chamber 14, the liquid level in the drip chamber 14 will automatically rise until it reaches the bottom of the venting needle 1311. The height of the bottom of the venting needle 1311 is the height that the liquid level in the drip chamber 14 needs to reach during infusion, thus realizing the self-venting function. When the liquid level in the dripping chamber 14 reaches the bottom height of the vent needle 1311, the liquid will enter the vent needle 1311 and reach the hydrophilic membrane 1314. Due to the hydrophilicity of the hydrophilic membrane 1314, the liquid can easily penetrate the hydrophilic membrane 1314 and come into contact with the hydrophobic membrane 1315. At this point, due to the hydrophobic properties of the hydrophobic membrane 1315, the liquid can no longer penetrate the hydrophobic membrane 1315, preventing liquid leakage. When the infusion continues, after the hydrophilic membrane 1314 is moistened, air cannot penetrate the hydrophilic membrane 1314, and external air cannot re-enter the dripping chamber 14, preventing the liquid level in the dripping chamber 14 from dropping and emptying.
[0041] Please see Figure 1 and Figure 3 In a preferred embodiment of this application, the exhaust boss 1312 is provided with a receiving groove 1313a communicating with the exhaust needle 1311, and the receiving groove 1313a is provided with a composite membrane 1316 and an exhaust plug 1317.
[0042] The composite membrane 1316 is a microporous membrane with a hydrophilic bottom surface and a hydrophobic top surface;
[0043] The vent plug 1317 is glued to the receiving groove 1313a, and its bottom presses against the periphery of the composite membrane 1316.
[0044] Furthermore, the vent plug 1317 is provided with a cap that can be opened and closed.
[0045] It should be noted that, in this embodiment, during use, after the infusion set stopper puncturist 11 is inserted into the medication container, the medication flows into the drip chamber 14 through the upper short tube 12. Air in the drip chamber 14 is expelled from the infusion set sequentially through the vent needle 1311, the composite membrane 1316, and the vent plug 1317. Without squeezing the drip chamber 14, the liquid level will automatically rise until it reaches the bottom of the vent needle 1311. The height of the bottom of the vent needle 1311 is the required height of the liquid level in the drip chamber 14 during infusion, thus achieving the self-venting function. When the liquid level in the drip chamber 14 reaches the bottom height of the vent needle 1311, the liquid will enter the vent needle 1311 and reach the composite membrane 1316. Due to the hydrophilicity of the bottom surface of the composite membrane 1316, it will quickly become wetted. The hydrophobicity of the top surface of the composite membrane 1316 prevents further leakage by the liquid penetrating the membrane. When the infusion continues, air cannot penetrate the bottom surface of the moistened composite membrane 1316, and external air cannot re-enter the dripping chamber 14, thus preventing the liquid level in the dripping chamber 14 from dropping and emptying.
[0046] Please see Figure 1 and Figure 4 In a preferred embodiment of this application, the exhaust boss 1312 is provided with a receiving groove 1313b communicating with the exhaust needle 1311, and the receiving groove 1313b is provided with a breathable block 1318, and the breathable block 1318 and the receiving groove 1313b are interference fit.
[0047] The lower half of the breathable block 1318 has hydrophilic properties, achieved through hydrophilic treatment, while the upper half has hydrophobic properties, achieved through hydrophobic treatment.
[0048] Furthermore, the breathable block 1318 is made of high-density polyethylene and ultra-high molecular weight polyethylene through sintering, and has a porous structure with breathability.
[0049] It should be noted that, similar to the second embodiment, when the liquid comes into contact with the breathable block 1318, it wets the hydrophilic lower half of the breathable block 1318, but cannot penetrate the hydrophobic upper half. Therefore, it can achieve the functions of preventing liquid leakage and preventing air penetration into the dripping chamber 14.
[0050] Please see Figure 1 and Figure 5 In a preferred embodiment of this application, the exhaust boss 1312 is provided with a receiving groove 1313c that communicates with the exhaust needle 1311, and the bottom of the receiving groove 1313c is provided with a cavity;
[0051] The bottom of the receiving groove 1313c is provided with a hydrophobic membrane 1315c by hot welding or ultrasonic welding, and the cavity is provided with foaming balls 1319.
[0052] In a preferred embodiment of this application, the bottom of the cavity is provided with an exhaust groove, and the diameter of the cavity is larger than the diameter of the exhaust hole in the exhaust needle 1311 and smaller than the diameter of the foam ball 1319, so as to facilitate air permeability.
[0053] Preferably, the bottom of the cavity has a spherical structure to facilitate mating with the surface of the foaming ball 1319.
[0054] Furthermore, the foaming ball 1319 is made of sodium polyacrylate material, which will absorb water and swell upon contact with liquid.
[0055] It should be noted that, in this embodiment, during use, after the infusion set stopper puncturist 11 is inserted into the medication container, the medication flows into the drip chamber 14 through the upper short tube 12. Air inside the drip chamber 14 is expelled from the infusion set sequentially through the vent needle 1311, the foaming bulb 1319, the vent groove, the cavity, and the hydrophobic membrane 1315c. Without squeezing the drip chamber 14, the liquid level inside will automatically rise until it reaches the bottom of the vent needle 1311. The height of the bottom of the vent needle 1311 is the required height of the liquid level in the drip chamber 14 during infusion, thus achieving the self-venting function. When the liquid level in the drip chamber 14 reaches the bottom height of the vent needle 1311, the liquid will enter the vent needle 1311, reach the foaming bulb 1319, and then the hydrophobic membrane 1315c. At this point, due to the hydrophobic properties of the hydrophobic membrane 1315c, the liquid can no longer penetrate the membrane, preventing leakage. When the infusion continues, due to the water absorption properties of the sodium polyacrylate foam ball 1319, the foam ball 1319 will absorb water and expand, filling the entire cavity, like a bottle stopper blocking the cavity. External air can no longer enter the drip chamber 14 through the cavity, preventing the liquid level in the drip chamber 14 from dropping and emptying.
[0056] In summary, this invention improves the structure of the venting assembly, enabling the hydrophobic membrane to self-seal the venting holes in the venting core after venting. This effectively prevents air from entering the infusion set during infusion, thus preventing the drip chamber from running dry or even the harmful effects of air entering the body. Simultaneously, the self-sealing feature completely eliminates the risk of airborne particles contaminating the medication within the infusion set, making it safe, reliable, and easy to operate.
[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A self-venting and self-sealing infusion set, comprising, in sequence, an air inlet device, a stopper puncture device, an upper short tube, a drip chamber cap, a drip chamber, a long tubing, a flow regulator, an injection device, a drug solution filter, and an intravenous infusion needle, characterized in that, The dripping container lid is provided with an exhaust assembly, which includes an exhaust needle located inside the dripping container lid and an exhaust protrusion located on the top of the dripping container lid; The exhaust protrusion has a receiving groove that communicates with the exhaust needle. The receiving groove is stepped, with a hydrophilic membrane on the bottom step by hot welding or ultrasonic welding, and a hydrophobic membrane on the top step by hot welding or ultrasonic welding.
2. The self-pumping, self-sealing infusion set of claim 1, wherein, The hydrophilic membrane is made of hydrophilically treated polyethersulfone, polypropylene, polyester, nylon, polyester fiber or cellulose ester.
3. The self-pumping, self-sealing infusion set of claim 1, wherein, The hydrophobic membrane is made of hydrophobically treated glass fiber, polypropylene, polyester, polytetrafluoroethylene or polyvinylidene fluoride.
4. The self-venting and self-sealing infusion set according to claim 1, characterized in that, The top of the drip chamber lid is equipped with a clamping column.
5. A self-venting and self-sealing infusion set, comprising, in sequence, an air inlet device, a stopper puncture device, an upper short tube, a drip chamber cap, a drip chamber, a long tubing, a flow regulator, an injection device, a drug solution filter, and an intravenous infusion needle, characterized in that, The dripping container lid is provided with an exhaust assembly, which includes an exhaust needle located inside the dripping container lid and an exhaust protrusion located on the top of the dripping container lid; The exhaust protrusion has a receiving groove communicating with the exhaust needle, and the receiving groove has a composite membrane and an exhaust plug. The composite membrane is a microporous membrane with a hydrophilic bottom surface and a hydrophobic top surface; The vent plug is glued to the receiving groove and its bottom presses against the periphery of the composite membrane.
6. A self-venting and self-sealing infusion set, comprising, in sequence, an air inlet device, a stopper puncturist, an upper short tube, a drip chamber cap, a drip chamber, a long tubing, a flow regulator, an injection device, a drug solution filter, and an intravenous infusion needle, characterized in that, The dripping container lid is provided with an exhaust assembly, which includes an exhaust needle located inside the dripping container lid and an exhaust protrusion located on the top of the dripping container lid; The exhaust protrusion has a receiving groove that communicates with the exhaust needle, and the receiving groove has a vent block. The vent block and the receiving groove are interference fit. The lower half of the breathable block is hydrophilic, while the upper half is hydrophobic.
7. The self-venting and self-sealing infusion set according to claim 6, characterized in that, The breathable block is made of high-density polyethylene and ultra-high molecular weight polyethylene through sintering.
8. A self-venting and self-sealing infusion set, comprising, in sequence, an air inlet device, a stopper puncture device, an upper short tube, a drip chamber cap, a drip chamber, a long tubing, a flow regulator, an injection device, a drug solution filter, and an intravenous infusion needle, characterized in that, The dripping container lid is provided with an exhaust assembly, which includes an exhaust needle located inside the dripping container lid and an exhaust protrusion located on the top of the dripping container lid; The exhaust protrusion has a receiving groove that communicates with the exhaust needle, and the bottom of the receiving groove has a cavity; The bottom of the receiving tank is provided with a hydrophobic membrane by thermal welding or ultrasonic welding, and the cavity is provided with foaming balls.
9. The self-venting and self-sealing infusion set according to claim 8, characterized in that, The foaming balls are made of sodium polyacrylate.
10. The self-venting and self-sealing infusion set according to claim 8, characterized in that, The bottom of the cavity is provided with an exhaust groove. The diameter of the cavity is larger than the diameter of the exhaust hole in the exhaust needle, but smaller than the diameter of the foaming ball.