A flow splitting device for an infusion line of an infusion set

Abstract

The application relates to the technical field of medical appliances, in particular to a shunt device for an infusion tube of an infusion apparatus, which comprises a shell, a cover plate, an inlet nozzle and two outlet nozzles, and further comprises a shunt assembly, a control assembly and an adjusting assembly; the shunt assembly is arranged in the shell and is connected with the inlet nozzle and the two outlet nozzles, and is used for shunting the medicine liquid flowing out of the inlet nozzle to the two outlet nozzles; the control assembly is arranged in the shell and is connected with the shunt assembly; when the control assembly is in the neutral position, the two outlet nozzles are in the closed state; when the control assembly deviates from the neutral position and swings, the outlet nozzle away from the swinging direction is opened. Through the shunt assembly, the control assembly and the adjusting assembly, the medicine liquid can be prevented from being polluted and breeding bacteria in the process of switching the infusion channel, and the operation personnel can easily switch the infusion channel, so that the rescue efficiency is ensured.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a diversion device for the infusion tubing of an infusion set. Background Technology

[0002] In the biomedical engineering industry, infusion sets are a common medical consumable used for intravenous infusion after being sterilized.

[0003] Current infusion sets typically only have one puncture device, while multiple IV bags are often used during infusion. When changing IV bags, patients need to insert and remove the puncture device. Some patients change the bags themselves when medical staff are not present. Since the patient's hands are not disinfected, the puncture device is easily contaminated during removal. As a sterile component, contamination of the puncture device can cause temporary discomfort or, in severe cases, bloodstream infection. To address these issues, existing technologies offer effective solutions, such as the infusion tubing diversion device in CN108704195B, which eliminates the need to insert and remove the puncture needle when changing different medications during infusion, effectively reducing the risk of infection for the patient. However, the following drawbacks still exist: Rotary three-way piston valves are widely used in clinical practice for switching between multiple infusion lines. The valve core is usually cylindrical or frustum-shaped and inserted into the three-way body. The angle switching is achieved by manually rotating the valve handle from 45° to 90°. In order to prevent leakage under hydrostatic pressure, these rotary valves usually have a spring on the valve stem. The two ends of the spring press against the three-way body and the limiting element respectively, forcing the valve core to maintain a mechanically tight fit with the inner wall of the three-way body under extremely high pressure. However, under high pressure or when infusing viscous drugs (such as fat emulsions and hypertonic glucose), the tiny crystals precipitated from the drug solution can seep into the rotating sealing surface of the valve core. This not only causes bacterial growth but also leads to a sharp increase in frictional resistance, making it difficult for the operator to frequently operate the rotary switch, which in turn seriously affects the efficiency of rescue.

[0004] Therefore, in order to solve the above problems, a diversion device for the infusion tube on an infusion set is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a diversion device for the infusion tubing of an infusion set, which solves the problem that tiny crystals precipitated from the medication during high-pressure or viscous infusion can seep into the rotating sealing surface, affecting rescue efficiency. Through the design of the diversion component, control component, and adjustment component, the switching of infusion channels can avoid both contamination of the medication and bacterial growth, and also prevent difficulties for operators in switching infusion channels, thereby ensuring rescue efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A diversion device for an infusion tubing on an infusion set includes a housing, a cover, an inlet nozzle, and two outlet nozzles. It also includes a diversion assembly, a control assembly, and an adjustment assembly. The diversion assembly is located inside the housing and communicates with the inlet nozzle and the two outlet nozzles, used to divert the medication flowing from the inlet nozzle to the two outlet nozzles. The control assembly is located inside the housing and connected to the diversion assembly. When the control assembly is in a neutral position, both outlet nozzles are closed. When the control assembly deviates from the neutral position and swings, the outlet nozzle furthest from the swing direction opens. The adjustment assembly is located on the control assembly and connected to the diversion assembly. When the control assembly deviates from the neutral position, the adjustment assembly draws a portion of the medication from the diversion assembly on the open outlet nozzle for storage, and simultaneously assists in delivering medication to the diversion assembly on the closed outlet nozzle.

[0007] Preferably, the diversion assembly includes a three-way pipe and two diversion pipes. The feed port of the three-way pipe is connected to the inlet nozzle. The upper ends of the diversion pipes are respectively disposed at the corresponding outlet ends of the three-way pipe. The other ends of the two diversion pipes are respectively connected to the corresponding outlet nozzles. A branch pipe communicating with the interior of the diversion pipe is disposed on the diversion pipe, and a drug capsule communicating with the interior of the branch pipe is disposed on the branch pipe.

[0008] Preferably, the control component includes a drive element, a telescopic rod, a mounting bracket, a sliding sleeve, a drive rod, an annular plate, a spring, and a pressure plate. The drive element is disposed within the housing, and the telescopic rod is connected to the drive element. The drive element includes a rotating rod, a worm gear, and a worm. The rotating rod is rotatably disposed within the housing. The fixed ends of the worm gear and the telescopic rod are both disposed on the rotating rod. The worm is fitted onto one side of the worm gear, and one end of the worm extends to the outside of the housing and is fitted with a knob. The mounting bracket is fixedly disposed within the housing, and both ends are U-shaped and engage with the corresponding diverter pipes. The sliding sleeve is movably fitted onto the middle section of the mounting bracket and hinged to the free end of the telescopic rod. The middle section of the mounting bracket has a slotted opening. The drive rod is disposed within the slotted opening and movably fitted onto the mounting bracket. The annular plate is disposed on the drive rod. The spring is disposed between the sliding sleeve and the annular plate and fitted onto the drive rod. The pressure plate is disposed at the free end of the drive rod and contacts the outer wall of the corresponding diverter pipe.

[0009] Preferably, two regulating components are provided and symmetrically arranged inside the outer shell. Each regulating component includes a fixed block, a piston, a one-way valve one, and a one-way valve two. The fixed block is fixedly arranged inside the sliding sleeve, and a cavity is opened inside the fixed block. The driving rod passes through the cavity and is movably sleeved with the fixed block. The piston is fitted inside the cavity and fixedly sleeved with the end of the driving rod. The driving rod is hollow and communicates with the cavity. The branch pipe includes pipe one, pipe two, and pipe three. Pipe one, the driving rod, pipe two, the drug capsule, and pipe three are connected in sequence and are internally interconnected. The other ends of pipe one and pipe three both pass through the corresponding branch pipes. One-way valve one and one-way valve two are respectively arranged on pipe one and pipe three.

[0010] Preferably, when the telescopic rod is in the neutral position, both springs are in a compressed state, and the compression of the two springs is equal.

[0011] Preferably, when the telescopic rod is in the neutral position, the spring force accumulated by the spring is equal to the pressure when the diverter tube is squeezed and closed.

[0012] Preferably, the inner diameter of the diverter pipe is equal to that of pipe two and pipe three, and is larger than that of pipe one.

[0013] Preferably, the diversion tube is bonded to the inner wall of the outer shell, the tube is a rigid tube, and the initial storage volume of the drug sac inside the sac is greater than two-thirds of the internal volume of the sac.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the set diversion component and control component, the opening and closing of the infusion channel inside the diversion tube can be controlled by squeezing and releasing the pressure plate from the outside of the diversion tube. The entire control process is completely outside the diversion tube, and the control component has no direct contact with the drug solution inside the diversion tube. This effectively solves the problem of crystallization on the valve core contact surface caused by the infusion of high concentration and high viscosity drugs, which leads to a sharp increase in valve friction resistance or even jamming. At the same time, the non-contact design also significantly reduces the risk of bacterial growth, cross-contamination and pipeline leakage caused by frequent operation of the rotary switch.

[0015] 2. Through the set diversion component, control component, and adjustment component, the displacement of the sliding sleeve synchronously drives the two pistons in the adjustment component to move, converting the mechanical switching action into a volume change in the piston cavity; when one infusion channel is closed, it can automatically draw in part of the drug solution in the closed channel for temporary storage, thereby suppressing the generation of local pressure in the diversion tube; when the other channel is opened, it actively and quickly pumps part of the pre-stored drug solution back to the corresponding diversion tube, effectively compensating for the initial flow rate drop and drug administration delay caused by fluid inertia, and realizing a smooth flow transition during the infusion transition period.

[0016] 3. Through the set branch tubes and drug capsules, the drug capsules have elastic deformation capabilities and can work in conjunction with the adjustment components. At the moment of switching infusion channels, they can further absorb excess instantaneous high pressure or release pressure through volume rebound to relieve negative pressure, thereby suppressing pressure fluctuations, avoiding the impact of instantaneous pressure difference on the patient's blood vessels, and ensuring the safety and stability of continuous clinical infusion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of the shunt component of the present invention.

[0020] Figure 4 This is a schematic diagram of the connection structure between the shunt component and the control component of the present invention.

[0021] Figure 5 For the present invention Figure 4 A magnified view of part A in the middle.

[0022] Figure 6 This is a partial cross-sectional view of the connection structure of the shunt pipe, the sliding sleeve, and the adjustment assembly of the present invention.

[0023] In the diagram: 1. Outer shell; 2. Cover plate; 3. Inlet nozzle; 4. Outlet nozzle; 5. Diverter assembly; 51. T-junction; 52. Diverter pipe; 53. Branch pipe; 531. Pipe 1; 532. Pipe 2; 533. Pipe 3; 54. Drug capsule; 6. Control assembly; 61. Drive component; 611. Rotating rod; 612. Worm gear; 613. Worm; 614. Knob; 62. Telescopic rod; 63. Mounting bracket; 631. Strip-shaped opening; 64. Sliding sleeve; 65. Drive rod; 66. Annular plate; 67. Spring; 68. Pressure plate; 7. Adjustment assembly; 71. Fixing block; 711. Cavity; 72. Piston; 73. One-way valve 1; 74. One-way valve 2. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1 to 6 This invention provides a diversion device for the infusion tubing on an infusion set, the technical solution of which is as follows: For details, please refer to Figure 1 , Figure 2 and Figure 3 A diversion device for the infusion tube on an infusion set includes a housing 1, a cover plate 2, an inlet nozzle 3, and two outlet nozzles 4. The cover plate 2 is disposed on the open side of the housing 1, the inlet nozzle 3 is disposed on the top of the housing, and the two outlet nozzles 4 are symmetrically disposed on the bottom of the housing 1.

[0026] Furthermore, the infusion tubing diversion device on the infusion set also includes a diversion component 5, a control component 6, and an adjustment component 7. The diversion component 5 is located inside the outer casing 1 and is connected to the inlet nozzle 3 and two outlet nozzles 4, used to divert the liquid flowing from the inlet nozzle 3 to the two outlet nozzles 4. The diversion component 5 includes a three-way pipe 51 and two diversion pipes 52. The inlet port of the three-way pipe 51 is connected to the inlet nozzle 3. The upper ends of the diversion pipes 52 are respectively located at the corresponding outlet ends of the three-way pipe 51. The other ends of the two diversion pipes 52 are respectively connected to the corresponding outlet nozzles 4. A branch pipe 53 connected to the interior of the diversion pipe 52 is provided on the branch pipe 52, and a drug capsule 54 connected to the interior of the branch pipe 53 is provided on the branch pipe 53.

[0027] In clinical scenarios involving switching between multiple infusion lines, the rapid closing and opening of the infusion line often leads to drastic fluctuations in local pressure within the tubing when switching between two branches. Furthermore, for an infusion line about to be closed, the sudden stop causes the medication to stagnate momentarily, creating localized high pressure within the tubing. This can easily lead to tubing expansion, prolonged medication retention in the closed tubing, and even backflow. Conversely, for an infusion line that has just been opened, the instantaneous switch can cause a brief pressure drop and delayed medication delivery, thus affecting the stability of the infusion flow rate.

[0028] Therefore, in the above-described embodiment, by adding a branch tube 53 and a drug capsule 54 connected to the shunt tube 52, independent local buffering and storage units can be constructed in the infusion channels of the two shunt tubes 52. Because the drug capsule 54 has a certain degree of volumetric flexibility, it can effectively absorb excess pressure generated when the corresponding shunt tube 52's infusion channel is closed, or release pressure through volumetric rebound when the infusion channel is opened. This effectively suppresses instantaneous high or negative pressure generated during tubing switching, protecting the patient's blood vessels from pressure shocks and ensuring the safety and stability of clinical infusion.

[0029] As one embodiment of the present invention, refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 It also includes a control component 6, which is located inside the housing 1. When the control component 6 is in the neutral position, both outlet nozzles 4 are closed. When the control component 6 swings away from the neutral position, the outlet nozzle 4 away from the swing direction opens.

[0030] Optionally, the control component 6 includes a drive element 61, a telescopic rod 62, a mounting bracket 63, a sliding sleeve 64, a drive rod 65, an annular plate 66, a spring 67, and a pressure plate 68. The drive element 61 is disposed inside the housing 1, and the telescopic rod 62 is connected to the drive element 61. The drive element 61 includes a rotating rod 611, a worm gear 612, and a worm 613. The rotating rod 611 is rotatably disposed inside the housing 1. The fixed ends of the worm gear 612 and the telescopic rod 62 are both disposed on the rotating rod 611. The worm 613 is fitted onto one side of the worm gear 612, and one end of the worm 613 extends through to the outside of the housing 1 and is fitted with a knob 614. The mounting bracket 63 is fixedly disposed inside the housing 1, and both ends are U-shaped to engage with the corresponding diverter pipes 52. The sliding sleeve 64 is movably fitted onto the middle section of the mounting bracket 63 and hinged to the free end of the telescopic rod 62. The mounting bracket 63 has a slotted opening 631 in the middle section. The drive rod 65 is located inside the slotted opening 631 and is movably connected to the mounting bracket 63. An annular plate 66 is located on the drive rod 65. A spring 67 is located between the sliding sleeve 64 and the annular plate 66 and is connected to the drive rod 65. A pressure plate 68 is located at the free end of the drive rod 65 and contacts the outer wall of the corresponding diversion pipe 52.

[0031] Traditional multi-way infusion switching valves require the valve core to directly contact and slide relative to the medication solution. When infusing high-concentration, viscous medication solutions (such as fat emulsions and hypertonic glucose), the valve core is prone to crystallization, which can easily enter the sliding gap, leading to a sharp increase in mechanical friction resistance and potential jamming. Simultaneously, the direct contact between the valve core's internal moving parts and the medication solution increases the risk of bacterial growth and cross-contamination. By employing the above-described embodiment of this application, the shunt tube 52 is snapped onto the end of the fixed mounting bracket 63, and the pressure plate 68 is used to externally compress the tube wall to achieve the opening and closing of the shunt tube 52. The entire control process occurs outside the shunt tube 52, without direct contact with the medication solution inside, thus avoiding the jamming problem caused by medication crystallization and reducing the risk of leakage and contamination. Meanwhile, the sliding sleeve 64, through symmetrically arranged springs 67 and drive rods 65, allows the telescopic rod 62 and the sliding sleeve 64 to simultaneously press the two diversion tubes 52 together by the elastic force of the springs 67 on both sides when they are in the neutral position. This converts the rigid displacement of the drive component 61 into flexible elastic pressing, preventing damage to the tubing due to excessive operating force and extending the service life of the infusion consumables. Furthermore, the deformation space of the springs 67 can automatically compensate for uneven wall thickness of the diversion tubes 52 caused by manufacturing tolerances, ensuring the uniformity and reliability of each squeeze-to-interrupt flow.

[0032] When channel switching is required, the drive knob 614 is rotated. During the rotation of the knob 614, the worm gear 613 and worm wheel 612 are connected to drive the worm wheel 612 and the rotating rod 611 to rotate synchronously. Since the fixed end of the telescopic rod 62 is set on the rotating rod 611 and the free end is hinged to the sliding sleeve 64, the telescopic deformation of the telescopic rod 62 can drive the sliding sleeve 64 to move laterally along the surface of the mounting bracket 63 during the rotation of the rotating rod 611. Furthermore, during the movement of the sliding sleeve 64 to one side, the spring 67 and the annular plate 66 on that side can be used to press the drive rod 65, thereby increasing the pressure between the pressure plate 68 at the end of the drive rod 65 and the corresponding diversion pipe 52. At the same time, the spring 67 on the other side can be released during the movement of the sliding sleeve 64 to one side, allowing the corresponding diversion pipe 52 to smoothly reset and open under the action of the pipe wall elasticity and the liquid pressure.

[0033] As one embodiment of the present invention, refer to Figure 2 and Figure 6 It also includes adjustment components 7, of which there are two symmetrically arranged inside the housing 1.

[0034] Optionally, the adjusting assembly 7 includes a fixed block 71, a piston 72, a first check valve 73, and a second check valve 74. The fixed block 71 is fixedly disposed within the sliding sleeve 64, and a cavity 711 is formed inside the fixed block 71. The drive rod 65 passes through the cavity 711 and is movably sleeved with the fixed block 71. The piston 72 is fitted within the cavity 711 and is fixedly sleeved with the end of the drive rod 65. The two ends of the spring 67 are fixedly connected to the annular plate 66 and the fixed block 71, respectively. The drive rod 65 is hollow and communicates with the cavity 711. The branch pipe 53 includes pipe 1 531, pipe 2 532 and pipe 3 533. Pipe 1 531, drive rod 65, pipe 2 532, drug capsule 54 and pipe 3 533 are connected in sequence and are internally interconnected. The other ends of pipe 1 531 and pipe 3 533 are both inserted into the corresponding branch pipe 52. One-way valve 1 73 and one-way valve 2 74 are respectively installed on pipe 1 531 and pipe 3 533.

[0035] In real-world scenarios involving rapid switching between multiple infusion channels in clinical settings, when a conventional shunt device closes one infusion channel, the medication remaining in that channel is prone to localized pressure buildup or backflow upstream due to clamping and squeezing. Meanwhile, when the infusion channel is opened, the flow rate is difficult to reach a stable value instantly due to fluid inertia and resistance, resulting in a sudden drop in flow rate and delayed drug administration at the patient's end.

[0036] Therefore, in the above-described embodiments of this application, the fixed block 71, piston 72, one-way valve 73, and one-way valve 74 directly and synchronously convert the displacement of the mechanical switching into changes in the pumping volume within piston 72 and cavity 711, achieving adaptive synchronous compensation for one-draw and one-delivery. When the infusion channel is closed, a portion of the medication is automatically drawn in and stored; when the channel is opened, the pre-stored medication is automatically and rapidly pumped back into the corresponding diversion pipe 52 via one-way valve 74, thereby ensuring a stable and smooth flow rate during the infusion transition period.

[0037] In actual operation, taking the process of fixed block 71 following sliding sleeve 64 from the rightmost side through the neutral position and then moving towards the left as an example (at this time, the right-side diversion pipe 52 is in a closed state under the elastic force of the right-side spring 67, while the left-side diversion pipe 52 is in an open state), under the elastic force of the right-side spring 67, the position of the right-side drive rod 65 remains unchanged at first, while the left side wall of the right-side cavity 711 gradually moves away from the right-side piston 72. During this process, the pressure in the right-side cavity 711 decreases, and then, under the action of the pipe 531 connected to the drive rod 65 and the one-way valve 73, part of the liquid medicine in the right-side diversion pipe 52 is drawn into the right-side cavity 711 for storage, until the right-side pressure plate 68 separates from the right-side diversion pipe 52, at which point the right-side diversion pipe 52 is in an open state. At the same time, when the left-side pressure plate 68 is blocked by the left-side diversion pipe 52, the distance between the right side wall of the left-side cavity 711 and the left-side piston 72 decreases. During this process, the pressure inside the cavity 711 on the left increases, thereby transporting part of the liquid medicine stored in the cavity 711 to the drug bag 54 on the left through the second tube 532 on the drive rod 65, and finally into the diversion tube 52 on the left under the action of the third tube 533 and the one-way valve 74. At this time, the diversion tube 52 on the left is in a closed state.

[0038] As one embodiment of the present invention, refer to Figure 4 and Figure 5 When the telescopic rod 62 is in the neutral position, both springs 67 are in a compressed state, and the amount of compression of the two springs 67 is equal.

[0039] By adopting the above implementation method, reliable and leak-free blocking of the two shunt tubes 52 is ensured under normal conditions. The continuous and symmetrical high-strength elastic clamping force can adaptively compensate for the aging and creep of the shunt tube 52 material, ensuring that the infusion channels in the two shunt tubes 52 can be effectively cut off, avoiding drug leakage and cross-contamination in non-working state.

[0040] As one embodiment of the present invention, refer to Figure 4 When the telescopic rod 62 is in the neutral position, the elastic force accumulated by the spring 67 is equal to the pressure when the diverter tube 52 is squeezed and closed.

[0041] By adopting the above-described implementation method, when the telescopic rod 62 is in the neutral position, the elastic force accumulated by the spring 67 is exactly equal to the critical pressure required when the corresponding diversion tube 52 is closed. This achieves micro-load protection for the diversion tube 52 while ensuring the sealing effect. It can minimize the compressive stress on the flexible wall of the diversion tube 52 while ensuring complete cutoff of the liquid medicine. This greatly alleviates the static creep and fatigue of the polymer material, prevents the diversion tube 52 from sticking, and ensures its rapid elastic reset and high-frequency working life when released.

[0042] As one embodiment of the present invention, refer to Figure 6 The inner diameter of the diverter pipe 52 is equal to that of pipe 2 532 and pipe 3 533 and is larger than that of pipe 1 531.

[0043] Under the above implementation method, firstly, rapid compensation with low flow resistance and low shear is achieved on the drug delivery side. The design of tubes 532 and 533 having the same inner diameter as the shunt tube 52 ensures a smooth transition of the infusion channel when the auxiliary drug solution is reinjected into the shunt tube 52, eliminating turbulence and eddies caused by abrupt changes in cross-section. At the same time, the larger tube diameter controls the liquid shear rate within a safe range, protecting the physical stability of sensitive drugs and avoiding the risk of mechanical demulsification. Secondly, tube 531 with a smaller inner diameter acts as a throttling damper during aspiration, enabling a smooth release of negative pressure and effectively preventing radial collapse of the shunt tube 52 under instantaneous negative pressure. This ensures a smooth aspiration process while reducing the volume of the internal cavity 711 of the aspiration tube 531, significantly reducing the dead space of residual drug solution. This not only reduces drug waste in clinical practice but also effectively prevents bacterial growth in tube 531 caused by drug retention during long-term infusion, ensuring the cleanliness and safety of the inner wall of the shunt tube 52.

[0044] As one embodiment of the present invention, refer to Figure 2 and Figure 6 The diversion tube 52 is bonded to the inner wall of the outer shell 1, the tube 3 533 is a rigid tube, and the initial storage volume of the medicine sac 54 is greater than two-thirds of the internal volume of the medicine sac 54.

[0045] Under the above-described implementation, the shunt tube 52 is fixedly installed, ensuring that the pressure plate 68 can accurately press the shunt tube 52, avoiding the shunt tube 52 from shifting and deforming during frequent pressing, and effectively extending the service life of the shunt tube 52. At the same time, the initial filling volume of the drug capsule 54 is greater than two-thirds, achieving sufficient pre-filling of the tube 533, purging local air in the pipeline, and ensuring the safety of clinical medication. Furthermore, the sufficient pre-filling keeps the wall of the flexible drug capsule 54 in a slightly tense state, which can spontaneously provide initial power for auxiliary drug discharge by utilizing its own elasticity at the moment the one-way valve 74 opens.

[0046] Working principle: When switching between multiple infusion channels, the operator manually rotates the knob 614. Through the cooperation of the worm gear 613 and the worm wheel 612, the rotating rod 611 is driven to rotate synchronously, thereby causing the telescopic rod 62 fixed on the rotating rod 611 to extend and retract, pushing the sliding sleeve 64, which is movably sleeved in the middle of the mounting frame 63, to move laterally along the surface of the mounting frame 63. Taking the process of the sliding sleeve 64 moving from the left side through the neutral position and then to the right side as an example (at this time, the left side diversion pipe 52 is closed and the right side diversion pipe 52 is open), as the sliding sleeve 64 moves to the right, under the elastic force of the left side spring 67, the position of the left side drive rod 65 remains unchanged at first, so that the right side wall of the left cavity 711 gradually moves away from the piston 72 fixedly sleeved with the end of the left drive rod 65, resulting in an increase in volume and a decrease in pressure in the left cavity 711, generating negative pressure. This negative pressure draws part of the liquid medicine in the left diversion pipe 52 and above the corresponding pressure plate 68 into the left cavity 711 for temporary storage through the pipe 531 connected to the left drive rod 65 and the one-way valve 73 set on it. This timely absorbs the local high pressure generated at the moment the left diversion pipe 52 opens, preventing the pipeline from expanding and the liquid medicine from remaining or flowing back for a long time. Simultaneously, the sliding sleeve 64 and the fixing block 71 move to the right. When the right pressure plate 68 is blocked by the right diversion pipe 52, the distance between the left wall of the right cavity 711 and the right piston 72 decreases, resulting in a decrease in volume and an increase in pressure within the right cavity 711. This causes the pre-stored portion of the medication in the right cavity 711 to be pumped into the right medication sac 54 via the corresponding drive rod 65 and pipe 2 532. Under pressure and its own volume rebound, the medication sac 54 rapidly pumps the medication into the right diversion pipe 52 via pipe 3 533 and the one-way valve 2 74 mounted on it, providing adaptive active pumping compensation. This effectively eliminates the brief pressure drop and delivery lag caused by fluid inertia and resistance when the right diversion pipe 52 is opened, ensuring a stable infusion flow rate. The entire infusion channel switching control is implemented outside the corresponding diversion pipe 52, avoiding direct contact between moving parts and the medication, and reducing the risk of bacterial growth and cross-contamination.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diversion device for the infusion tubing of an infusion set, comprising a housing (1), a cover plate (2), an inlet nozzle (3), and two outlet nozzles (4), characterized in that: It also includes a diversion component (5), a control component (6), and an adjustment component (7). The diversion component (5) is located inside the housing (1) and is connected to the inlet nozzle (3) and two outlet nozzles (4). It is used to divert the liquid flowing out of the inlet nozzle (3) to the two outlet nozzles (4). The control component (6) is located inside the housing (1) and is connected to the diversion component (5). When the control component (6) is in the neutral position, both outlet nozzles (4) are closed. When the control component (6) swings away from the neutral position, the outlet nozzle (4) away from the swing direction opens. The adjustment component (7) is located on the control component (6) and is connected to the diversion component (5). When the control component (6) swings away from the neutral position, the adjustment component (7) draws some of the liquid in the diversion component (5) on the open outlet nozzle (4) for storage, and at the same time assists in conveying the liquid to the diversion component (5) on the closed outlet nozzle (4).

2. The diversion device for the infusion tubing on an infusion set according to claim 1, characterized in that: The diversion assembly (5) includes a three-way pipe (51) and two diversion pipes (52). The feed port of the three-way pipe (51) is connected to the inlet nozzle (3). The upper ends of the diversion pipes (52) are respectively set at the corresponding outlet ends of the three-way pipe (51). The other ends of the two diversion pipes (52) are respectively connected to the corresponding outlet nozzles (4). A branch pipe (53) connected to the inside of the diversion pipe (52) is provided on the diversion pipe (52). A drug capsule (54) connected to the inside of the branch pipe (53) is provided on the branch pipe (53).

3. A diversion device for the infusion tubing on an infusion set according to claim 2, characterized in that: The control component (6) includes a drive element (61), a telescopic rod (62), a mounting bracket (63), a sliding sleeve (64), a drive rod (65), an annular plate (66), a spring (67), and a pressure plate (68). The drive element (61) is disposed inside the housing (1), and the telescopic rod (62) is connected to the drive element (61). The mounting bracket (63) is fixedly disposed inside the housing (1), and both ends are U-shaped to engage with the corresponding diverter pipes (52). The sliding sleeve (64) is movably sleeved on the mounting bracket (63). The middle section is hinged to the free end of the telescopic rod (62). The middle section of the mounting bracket (63) has a strip opening (631). The drive rod (65) is located in the strip opening (631) and is movably sleeved with the mounting bracket (63). The annular plate (66) is located on the drive rod (65). The spring (67) is located between the sliding sleeve (64) and the annular plate (66) and is sleeved with the drive rod (65). The pressure plate (68) is located at the free end of the drive rod (65) and contacts the outer wall of the corresponding diversion pipe (52).

4. A diversion device for the infusion tubing on an infusion set according to claim 3, characterized in that: Two adjusting components (7) are symmetrically arranged inside the outer casing (1). Each adjusting component (7) includes a fixed block (71), a piston (72), a first one-way valve (73), and a second one-way valve (74). The fixed block (71) is fixedly disposed within the sliding sleeve (64). A cavity (711) is formed inside the fixed block (711). The driving rod (65) passes through the cavity (711) and is movably sleeved with the fixed block (71). The piston (72) is fitted within the cavity (711) and fixedly sleeved with the end of the driving rod (65). The drive rod (65) is hollow and connected to the cavity (711). The branch pipe (53) includes pipe one (531), pipe two (532) and pipe three (533). Pipe one (531), drive rod (65), pipe two (532), drug capsule (54) and pipe three (533) are connected in sequence and are internally interconnected. The other ends of pipe one (531) and pipe three (533) are both inserted into the corresponding branch pipe (52). One-way valve one (73) and one-way valve two (74) are respectively installed on pipe one (531) and pipe three (533).

5. A diversion device for the infusion tubing on an infusion set according to claim 3, characterized in that: When the telescopic rod (62) is in the neutral position, both springs (67) are in a compressed state, and the compression of the two springs (67) is equal.

6. A diversion device for the infusion tubing on an infusion set according to claim 3, characterized in that: When the telescopic rod (62) is in the neutral position, the elastic force accumulated by the spring (67) is equal to the pressure when the inside of the diverter tube (52) is squeezed and closed.

7. A diversion device for the infusion tubing on an infusion set according to claim 2, characterized in that: The inner diameter of the diverter (52) is equal to that of pipe two (532) and pipe three (533) and is greater than that of pipe one (531).

8. A diversion device for the infusion tubing on an infusion set according to claim 4, characterized in that: The diversion tube (52) is bonded to the inner wall of the outer shell (1), the tube three (533) is a rigid tube, and the initial storage volume of the drug sac (54) is greater than two-thirds of the internal volume of the drug sac (54).

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