A type of anti-backflow positive pressure infusion tee

Abstract

This utility model discloses a backflow-preventing positive pressure infusion tee, comprising: N T-shaped tubes, each T-shaped tube having two input ends and one output end, where N is a positive integer; a one-way connector for connecting to an external infusion tube, located at one input end of one of the T-shaped tubes; when N is greater than a certain value, the output end of the T-shaped tube is connected in series through N-1 other T-shaped tubes; and a positive pressure infusion connector connected to the other input end for connecting to another external infusion tube. Beneficial effects: The improved structure enhances the overall sealing effect, reducing the risk of leakage and infection. Multiple individual tees can be freely connected in series via male and female Luer interfaces to meet the differentiated needs of different cases, reduce resource waste, and lower hospital procurement and patient costs.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a backflow prevention positive pressure infusion tee. Background Technology

[0002] Three-way valves, as a commonly used medical infusion device, are widely used in clinical intravenous therapy, especially in scenarios requiring combined treatment with multiple medications, such as ICUs, anesthesiology departments, and operating rooms. Their main function is to separate and infuse multiple medications, preventing mixing and reactions between different medications outside the body. Conventional three-way valves are mostly plug-in type, requiring manual rotation to switch channels and complete medication infusion; their structure is relatively complex and requires high manufacturing precision. In clinical practice, there is also a need for multi-port interconnected three-way valves to adapt to personalized infusion protocols for complex cases.

[0003] Existing technical defects: Conventional multi-port three-way valves have a fixed number of ports, which cannot be flexibly adjusted according to actual cases, resulting in some ports being idle and increasing costs, or insufficient number of ports causing inconvenience in use. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to solve the problems in the prior art and provide a backflow-proof positive pressure infusion tee.

[0005] Technical solution: A backflow prevention positive pressure infusion tee is proposed, comprising: N T-shaped tubes, each T-shaped tube having two input terminals and one output terminal, where N is a positive integer; A one-way connector is used to connect to an external infusion tube. It is located at one of the input ends of one of the T-shaped tubes. When N is greater than 1, the output end of the T-shaped tube is connected in series through N-T-shaped tubes. A positive pressure infusion connector is connected to the other input terminal for connecting to another external infusion tube; The one-way connector and the positive pressure infusion connector are both equipped with one-way membranes at the positions where they connect to the T-tube.

[0006] Preferably, the T-shaped tube includes a male Luer interface end and a female Luer interface end, wherein the female Luer interface end of the T-shaped tube is the input end, the male Luer interface end of the T-shaped tube is the output end, and the unidirectional connector is connected to the T-shaped tube via a Luer connection.

[0007] Preferably, the adjacent T-shaped tubes are connected to the male and female Luer interface ends by a locking ring, so that when the male Luer interface end is inserted into the female Luer interface end, it is fixed to the female Luer interface end by the internal thread of the locking ring that is fixed to the male Luer interface end.

[0008] Preferably, a bracket connector is fixedly provided at one end of the T-shaped tube that communicates with the positive pressure infusion connector, and the positive pressure infusion connector is inserted into the adhesive cavity fixed inside the bracket connector.

[0009] Preferably, the unidirectional connector includes a female unidirectional connector Luer component and a male unidirectional connector Luer component; The female Luer member of the one-way connector is provided with a first one-way membrane tightly attached to one side, and the male Luer member of the one-way connector is provided with a first toothed cavity on one side. The inner wall of the first toothed cavity is provided with a first annular boss that closely abuts against the first one-way membrane and is arranged in the circumferential direction. The inner wall of the first toothed cavity is provided with a first extrusion block that abuts against the side of the male Luer member of the one-way connector that is close to the first one-way membrane. When the liquid flows from the female Luer member of the one-way connector toward the male Luer member of the one-way connector, the water flow can cause the edge of the first one-way membrane to deform between adjacent first annular bosses, allowing the liquid to pass through the first tooth cavity and the male Luer member of the one-way connector. When the liquid flows in the opposite direction, the water flow can cause the edge of the first one-way membrane to adhere to the side wall of the female Luer member of the one-way connector, thereby blocking the water flow.

[0010] Preferably, the bracket connector is fixedly connected to the input end of the T-shaped tube; The bracket connector has a second one-way membrane tightly attached to one side, and the T-shaped tube has a second toothed cavity on one side. The inner wall of the second toothed cavity has a second annular protrusion that closely abuts against the second one-way membrane and is arranged in the circumferential direction. The inner wall of the second toothed cavity has a second extrusion block that abuts against the side of the T-shaped tube that is close to the second one-way membrane. When the liquid flows towards the T-tube through the support connector, the water flow can cause the edge of the second one-way membrane to deform between adjacent second annular protrusions, allowing the liquid to pass through the second toothed cavity and the T-tube. When the liquid flows in the opposite direction, the water flow can cause the edge of the second one-way membrane to adhere to the side wall of the support connector to block the water flow.

[0011] Preferably, the positive pressure infusion connector includes an infusion connection connector and an infusion connector housing; The infusion connection connector is connected through the infusion connector housing; The infusion connector is inserted and fixed in the bonding cavity; The infusion connector housing is connected to the external input pipeline.

[0012] Preferably, the unidirectional connector female Luer member and the bracket connector are respectively provided with a first petal hole and a second petal hole. Beneficial effects

[0013] This invention proposes a novel anti-backflow positive pressure tee by combining a unidirectional membrane assembly structure with a positive pressure infusion structure, which has the following advantages: The unidirectional membrane structure effectively prevents blood or medication backflow, and combined with the positive pressure infusion connector, makes the infusion process more stable and reliable. The improved structure enhances the overall sealing effect, reducing the risk of leakage and infection. Multiple single-unit tee connectors can be freely connected in series via male and female Luer interfaces to meet the differentiated needs of different cases, reduce resource waste, and lower hospital procurement and patient costs. The traditional stopcock structure has been eliminated, eliminating the need for manual channel switching, making clinical use more convenient and efficient. The positive pressure infusion connector can maintain positive pressure for a short period even when the infusion set is removed, preventing blood backflow and gas backflow, further improving patient infusion safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of one side of the structure of this utility model; Figure 2 This is a utility model Figure 1 Schematic diagram of the cross-sectional structure at position AA; Figure 3 This is a utility model Figure 1 Schematic diagram of the cross-sectional structure at the middle BB position; Figure 4 This is a utility model Figure 1 Schematic diagram of the cross-sectional structure at the CC position; Figure 5 This is a utility model Figure 1 Schematic diagram of the cross-sectional structure at the DD position; Figure 6 This is a utility model Figure 2 Enlarged structural diagram of position A in the middle; Figure 7 This is a schematic diagram of the second petal hole structure of this utility model; Figure 8 This is a schematic diagram of the first petal hole structure of this utility model.

[0015] Figure label: 1. T-tube; 2. One-way connector; 3. Positive pressure infusion connector; 4. Male Luer connector end; 5. Female Luer connector end; 6. Locking ring; 7. Support connector; 8. Adhesive cavity; 9. Female Luer connector of one-way connector; 10. Male Luer connector of one-way connector; 11. First one-way membrane; 12. First toothed cavity; 13. First annular boss; 14. First compression block; 15. Second one-way membrane; 16. Second toothed cavity; 17. Second annular boss; 18. Second compression block; 19. Infusion connection connector; 20. Second petal hole; 21. Infusion connector shell; 22. First petal hole. Detailed Implementation

[0016] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0017] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0019] In response to the problems existing in the current technology, combined with Figure 1-8 A backflow prevention positive pressure infusion tee includes: There are N T-shaped tubes 1, each T-shaped tube 1 having two input terminals and one output terminal, where N is a positive integer; One-way connector 2, used to connect to an external infusion tube, is located at one of the input ends of one of the T-shaped tubes 1. When N is greater than 1, the output end of the T-shaped tube 1 is connected in series through N-1 T-shaped tubes 1. Figure 1 The vertical direction of the T-shaped pipe, from top to bottom, is the inlet and outlet ends; the left side is also the inlet end. Positive pressure infusion connector 3 is connected to the other input end and is used to connect to another infusion tube in the outside. The one-way connector 2 and the positive pressure infusion connector 3 are both provided with one-way membranes at the positions where they connect to the T-shaped tube 1.

[0020] Specifically, both the unidirectional connector 2 and the positive pressure infusion connector 3 are equipped with unidirectional membranes at their interfaces, ensuring that the medication flows in only one direction and preventing reverse flow of blood or medication, significantly reducing the risk of backflow and cross-contamination. Multiple T-tubes 1 can be connected in series through their output ends to achieve multi-channel expansion, meeting the infusion channel requirements of different cases. This avoids insufficient or redundant interfaces, reducing the financial burden on hospitals and patients. The system has two input ends and one output end, both of which include unidirectional membrane structures. The unidirectional connector 2 is manufactured using standard molds, while the other end connects to the positive pressure infusion connector 3 for better external infusion set connection in clinical practice. This eliminates the need for manual channel switching using traditional stopcock-type structures, allowing medical staff to use it directly, shortening operation time, reducing the probability of misoperation, and improving the convenience of clinical use.

[0021] In some specific embodiments, the T-tube 1 includes a male Luer connector 4 and a female Luer connector 5, wherein the female Luer connector 5 of the T-tube 1 is the input end, the male Luer connector 4 of the T-tube 1 is the output end, and the unidirectional connector 2 is connected to the T-tube 1 via Luer, using internationally recognized standard Luer connectors (male and female) to ensure compatibility with commonly used clinical infusion tubing and connectors.

[0022] In some specific embodiments, adjacent T-shaped tubes 1 are connected to the male Luer interface end 4 and the female Luer interface end 5 between adjacent T-shaped tubes 1 by locking rings 6, so that when the male Luer interface end 4 is inserted into the female Luer interface end 5, it is fixed to the female Luer interface end 5 by the internal thread of the locking ring 6 fixed to the male Luer interface end 4.

[0023] This design facilitates the expansion of existing connection structures to include multiple T-tubes. When administering medications that are difficult to pre-mix, these medications can be introduced separately through different tubes. This simplifies, stabilizes, and ensures a good seal between multiple T-valve units. Clinical medical staff can quickly combine the required number of T-valve units according to the patient's actual infusion channel needs (e.g., requiring 2, 3, or more inlets), perfectly solving the core pain point of fixed T-valve configurations being either insufficient or wasteful.

[0024] In some specific embodiments, a bracket connector 7 is fixedly provided at one end of the T-shaped tube 1 that communicates with the positive pressure infusion connector 3. The positive pressure infusion connector 3 is inserted into the adhesive cavity 8 fixed inside the bracket connector 7, which facilitates the convenient fixing of the existing positive pressure infusion connector 3 when it is necessary to add a pipeline for external liquid input.

[0025] In some specific embodiments, the one-way connector 2 includes a one-way connector female Luer element 9 and a one-way connector male Luer element 10; The female Luer member 9 of the one-way connector is provided with a first one-way membrane 11 tightly attached to one side, and the male Luer member 10 of the one-way connector is provided with a first toothed cavity 12 on one side. The inner wall of the first toothed cavity 12 is provided with a first annular boss 13 that is tightly abutted against the first one-way membrane 11 and is arranged in the circumferential direction. The inner wall of the first toothed cavity 12 is provided with a first extrusion block 14 that abuts against one side of the male Luer member 10 of the one-way connector that is close to the first one-way membrane 11. When liquid flows from the female Luer member 9 of the one-way connector toward the male Luer member 10 of the one-way connector, the water flow can cause the edge of the first one-way membrane 11 to deform between the adjacent first annular bosses 13, allowing the liquid to pass through the first tooth cavity 12 and the male Luer member 10 of the one-way connector. When the liquid flows in the opposite direction, the water flow can cause the edge of the first one-way membrane 11 to adhere to the side wall of the female Luer member 9 of the one-way connector, thereby blocking the water flow.

[0026] Specifically, the one-way connector 2 uses the cooperation of the female Luer component and the male Luer component, and a first one-way membrane 11 is provided on one side of the female Luer component, so that the liquid can only flow in the direction of the female Luer component 9 and the male Luer component 10 of the one-way connector, effectively blocking backflow. When the liquid flows in reverse, the edge of the first one-way membrane 11 will be tightly attached to the side wall of the female Luer component. With the support of the first extrusion block 14 and the first annular boss 13, the backflow is completely blocked, avoiding the backflow of blood or medicine. The first annular protrusions 13 are evenly distributed along the circumference, allowing the diaphragm to undergo local deformation and pass through the gap during forward flow, while forming a continuous sealing surface during reverse flow, thus significantly improving the sealing performance. The first extrusion block and the first annular protrusions limit and support the first unidirectional diaphragm, preventing excessive deformation or detachment of the unidirectional diaphragm during repeated opening and closing, thereby improving the product's durability. In addition, a through hole is provided on the inner wall of the unidirectional connector female Luer member 9 to allow communication between one side of the unidirectional connector female Luer member 9 and the T-shaped tube 1.

[0027] In some specific embodiments, the bracket connector 7 is fixedly connected to the input end of the T-shaped tube 1; The bracket connector 7 has a second one-way membrane 15 tightly attached to one side, and the T-shaped tube 1 has a second toothed cavity 16 on one side. The inner wall of the second toothed cavity 16 has a second annular boss 17 that closely abuts against the second one-way membrane 15 and is arranged in the circumferential direction. The inner wall of the second toothed cavity 16 has a second extrusion block 18 that abuts against the side of the T-shaped tube 1 that is close to the second one-way membrane 15. When the liquid flows in the direction of the support connector 7 toward the T-tube 1, the water flow can cause the edge of the second one-way membrane 15 to deform between the adjacent second annular protrusions 17, allowing the liquid to pass through the second toothed cavity 16 and the T-tube 1. When the liquid flows in the opposite direction, the water flow can cause the edge of the second one-way membrane 15 to adhere to the side wall of the support connector 7 to block the water flow.

[0028] Specifically, a second one-way membrane 15 and its matching second toothed cavity 16, second annular boss 17, and second extrusion block 18 are provided at the input end of the T-shaped tube 1, so that the position of the support connector 7 has a one-way flow guiding function. Both the support connector 7 and the one-way connector 2 have a one-way structure. When the liquid flows in the forward direction, the edge of the second one-way membrane 15 undergoes local deformation between the second annular boss 17, forming multiple microchannels to ensure smooth liquid flow and avoid flow obstruction. In the reverse flow situation, the second one-way membrane 15 automatically adheres to the side wall of the support connector 7 and forms a stable seal under the action of the second extrusion block 18 to prevent liquid or blood backflow. 17 is evenly distributed along the circumference to ensure that the second one-way membrane 15 can form a seal in any direction of force, thereby improving the overall sealing performance and safety of use. The second compression block 18 can both limit the excessive deformation of the one-way membrane and provide support, reducing fatigue or damage to the second one-way membrane 15, improving the durability and clinical service life of the device. When the infusion set leaves the input end of the positive pressure infusion connector 3, a small pressure will still be provided to allow the liquid to continue flowing into the T-shaped cavity, so that the one-way membrane has sufficient time and pressure balance to return to its original state. In addition, a through hole is provided on the inner wall of the support connector 8 to allow the bonding cavity 8 and the T-shaped tube 1 to communicate.

[0029] In some specific embodiments, the positive pressure infusion connector 3 includes an infusion connection connector 19 and an infusion connector housing 21; The infusion connection connector 19 is connected through the infusion connector housing 21; The infusion connection connector 19 is inserted and fixed in the bonding cavity 8; The infusion connector housing 21 is connected to the external input pipeline.

[0030] Specifically, the positive pressure infusion connector 3 is an existing connector, which facilitates connection to the infusion connector housing 21 through the external connection pipe, so that the liquid can pass through the infusion connector housing 21, the support connector 7, and the second one-way membrane 15 into the T-tube 1.

[0031] In some specific embodiments, the unidirectional connector female Luer member 9 and the support connector 7 are respectively provided with a first petal hole 22 and a second petal hole 20. When the liquid flows in the forward direction, the first petal hole 22 and the second petal hole 20 provide deformation and release space for the unidirectional membrane, causing the membrane to bulge locally and form a channel between the petal holes, thereby ensuring that the liquid can smoothly enter the downstream channel. When the liquid flows in the reverse direction, the unidirectional membrane around the petal holes will automatically stick back to the side wall of the female Luer member or the support connector, and in conjunction with the annular boss and the extrusion block, quickly seal the flow channel to achieve a more thorough backflow blocking. The petal hole structure makes the opening pressure of the unidirectional membrane lower, and the liquid does not need to have a large additional pressure to push the membrane open when flowing in the forward direction, reducing infusion resistance and improving infusion efficiency.

[0032] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A backflow-prevention positive pressure infusion tee, characterized in that, include: N T-shaped tubes (1), each T-shaped tube (1) has two input terminals and one output terminal, where N is a positive integer; One-way connector (2) is used to connect with an external infusion tube. It is located at one of the input ends of one of the T-tubes (1). When N is greater than 1, the output end of the T-tube (1) is connected in series through N-1 T-tubes (1). Positive pressure infusion connector (3) is connected to the other input end and is used to connect to another infusion tube in the outside. One-way membranes are provided at the positions where the one-way connector (2) and the positive pressure infusion connector (3) are connected to the T-tube (1).

2. The anti-backflow positive pressure infusion tee according to claim 1, characterized in that, The T-tube (1) includes a male Luer interface (4) and a female Luer interface (5), wherein the female Luer interface (5) of the T-tube (1) is the input end, the male Luer interface (4) of the T-tube (1) is the output end, and the one-way connector (2) is connected to the T-tube (1) through Luer.

3. The anti-backflow positive pressure infusion tee according to claim 1, characterized in that, The adjacent T-shaped tubes (1) are connected to the male Luer interface end (4) and the female Luer interface end (5) by a locking ring (6) so that when the male Luer interface end (4) is inserted into the female Luer interface end (5), it is fixed to the female Luer interface end (5) by the internal thread of the locking ring (6) fixed to the male Luer interface end (4).

4. The anti-backflow positive pressure infusion tee according to claim 1, characterized in that, The T-shaped tube (1) is connected to the positive pressure infusion connector (3) at one end, and a bracket connector (7) is fixedly provided. The positive pressure infusion connector (3) is inserted into the adhesive cavity (8) fixed inside the bracket connector (7).

5. The anti-backflow positive pressure infusion tee according to claim 4, characterized in that, The one-way connector (2) includes a one-way connector female Luer component (9) and a one-way connector male Luer component (10). The female Luer member (9) of the one-way connector is provided with a first one-way membrane (11) tightly attached to one side, and the male Luer member (10) of the one-way connector is provided with a first toothed cavity (12) on one side. The inner wall of the first toothed cavity (12) is provided with a first annular boss (13) that closely abuts against the first one-way membrane (11) and is arranged in the circumferential direction. The inner wall of the first toothed cavity (12) is provided with a first extrusion block (14) that abuts against the side of the male Luer member (10) of the one-way connector that is close to the first one-way membrane (11). When the liquid flows from the female Luer member (9) of the one-way connector toward the male Luer member (10) of the one-way connector, the water flow can cause the edge of the first one-way membrane (11) to deform between the adjacent first annular bosses (13), so that the liquid passes through the first tooth cavity (12) and the male Luer member (10) of the one-way connector. When the liquid flows in the opposite direction, the water flow can cause the edge of the first one-way membrane (11) to adhere to the side wall of the female Luer member (9) of the one-way connector to block the water flow.

6. The anti-backflow positive pressure infusion tee according to claim 5, characterized in that, The bracket connector (7) is fixedly connected to the input end of the T-shaped tube (1); The bracket connector (7) has a second one-way membrane (15) tightly attached to one side, and the T-shaped tube (1) has a second toothed cavity (16) on one side. The inner wall of the second toothed cavity (16) has a second annular boss (17) that closely abuts against the second one-way membrane (15) and is arranged in the circumferential direction. The inner wall of the second toothed cavity (16) has a second extrusion block (18) that abuts against the side of the T-shaped tube (1) that is close to the second one-way membrane (15). When the liquid flows in the direction of the support connector (7) toward the T-tube (1), the water flow can cause the edge of the second one-way membrane (15) to deform between the adjacent second annular protrusions (17), so that the liquid passes through the second toothed cavity (16) and the T-tube (1). When the liquid flows in the opposite direction, the water flow can cause the edge of the second one-way membrane (15) to adhere to the side wall of the support connector (7) to block the water flow.

7. The anti-backflow positive pressure infusion tee according to claim 1, characterized in that, The positive pressure infusion connector (3) includes an infusion connection connector (19) and an infusion connector housing (21). The infusion connection connector (19) is connected through the infusion connector housing (21); The infusion connection connector (19) is inserted and fixed in the bonding cavity (8); The infusion connector housing (21) is connected to the external input pipeline.

8. The anti-backflow positive pressure infusion tee according to claim 5, characterized in that, The unidirectional connector female Luer component (9) and the bracket connector (7) are respectively provided with a first petal hole (22) and a second petal hole (20).

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