Multi-connected intravenous infusion apparatus

Abstract

The invention discloses a multi-connected intravenous infusion apparatus which comprises a bag body, a hanging groove is formed in the top of the bag body, and a liquid inlet, a liquid outlet and a liquid supplementing opening are formed in the bottom of the bag body. The liquid feeding assembly comprises a liquid feeding pipeline connected with the liquid inlet, a plurality of branch pipes and an exchanger, the tail end of the liquid feeding pipeline is branched into a first branch pipe, a second branch pipe and a third branch pipe, the first branch pipe and the second branch pipe converge through a fourth branch pipe, and the fourth branch pipe and the third branch pipe converge and then are connected into the liquid feeding pipeline; the alternating current device is arranged at the converging position of the branch pipes and comprises a shell, a sliding block and a spring, the sliding block is driven by liquid medicine flowing thrust to alternately seal the flow dividing opening, and multiple bottles of liquid medicine are independently conveyed in sequence; the liquid injection assembly comprises a liquid injection pipeline connected with the liquid outlet, a drip cup and a flow regulator, the drip cup is used for buffering the flow speed of the liquid medicine and observing the dripping speed, and the flow regulator linearly presses the liquid injection pipeline through a roller to regulate the pipe diameter so as to control the infusion speed.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and specifically to a multi-connected intravenous infusion set, which is particularly suitable for clinical scenarios where multiple medicinal liquids need to be infused in a specific order and drug mixing needs to be avoided, such as chemotherapy, sequential antibiotic therapy, etc. Background Art

[0002] Intravenous infusion is a widely used administration method in clinical treatment. In complex treatment regimens, it is often necessary to infuse multiple medicinal liquids in a strict order to avoid drug interactions or incompatibilities. However, the existing multi-connected infusion sets have the following defects: 1. Insufficient accuracy in controlling the order of medicinal liquids: In traditional multi-bottle infusions, series or parallel pipeline switching is mostly adopted, and the order is controlled by medical staff manually operating valves. It is easy to cause incorrect infusion order of medicinal liquids due to operation errors. Some devices attempt to achieve automation through electronic control valves, but there are problems such as high cost, high risk of circuit failures, and inability to adapt to complex liquid environments.

[0003] 2. Poor stability of medicinal liquid flow: Existing infusion sets rely on gravity drive. When multiple bottles of medicinal liquids pass through the same pipeline, differences in the density and viscosity of different medicinal liquids easily cause flow rate fluctuations, and even reverse flow of medicinal liquids due to uneven pressure. Although there are technical solutions using branched pipelines, there is still a lack of an active switching mechanism, resulting in the risk of multiple medicinal liquids flowing into the main pipeline simultaneously.

[0004] 3. Complicated operation for temporary fluid replacement: In clinical practice, it is often necessary to temporarily add auxiliary drugs (such as analgesics, anti-allergy drugs) during the infusion process. In the existing technology, it is often added at the drip chamber position, but due to the small capacity of the drip chamber, it cannot meet a large addition volume (such as greater than 20 ml). Summary of the Invention

[0005] The problem to be solved by this application is that the existing infusion sets have problems of insufficient accuracy in controlling the order of medicinal liquids, poor flow stability, and complicated operation for temporary fluid replacement.

[0006] To solve the above technical problems, the present application provides a multi-connected intravenous infusion set, which includes a bag body with a hanging groove at the top and a liquid inlet, a liquid outlet and a supplementary liquid port at the bottom; a liquid delivery assembly, including a liquid delivery pipeline connected to the liquid inlet, a plurality of branch pipes and a flow exchanger. The end of the liquid delivery pipeline bifurcates into a first branch pipe, a second branch pipe and a third branch pipe. The first branch pipe and the second branch pipe converge through a fourth branch pipe, and after the fourth branch pipe and the third branch pipe converge, they are connected to the liquid delivery pipeline. The flow exchanger is arranged at the branch pipe convergence point and includes a shell, a slider and a spring. The slider is driven by the thrust of the flowing liquid medicine to alternately close the shunt ports, so as to realize the sequential and independent delivery of multiple bottles of liquid medicine; an injection assembly, including an injection pipeline connected to the liquid outlet, a drip chamber and a flow regulator. The drip chamber is used to buffer the flow rate of the liquid medicine and observe the drip rate. The flow regulator linearly compresses the injection pipeline through a roller to adjust the pipe diameter to control the infusion speed.

[0007] Since the infusion set of the present application is designed with a liquid delivery assembly and an injection assembly, through the above technical features, the present invention comprehensively improves the sequential control of multiple liquid medicines, anti-mixing, flow rate stability and operation convenience under the conditions of low cost and without external energy, and solves the problems of insufficient accuracy of liquid medicine sequential control, poor flow stability and cumbersome temporary supplementary liquid operation existing in the infusion sets of the prior art.

[0008] For the above multi-connected intravenous infusion set, the bag body is in a vertically arranged rectangular structure and is made of medical-grade PVC material. The liquid inlet, the liquid outlet and the supplementary liquid port are horizontally and equidistantly distributed along the bottom of the bag body.

[0009] For the above multi-connected intravenous infusion set, the shell of the flow exchanger is a horizontal cylindrical structure, and the end covers are connected by threads at both ends. The springs on both sides of the slider abut against the end covers, and the axes of the shunt ports and the convergence ports are perpendicularly arranged.

[0010] For the above multi-connected intravenous infusion set, the liquid delivery assembly further includes a communicator, which includes a double-channel needle rod, a filter pad and a rubber plug. The inner part of the needle rod is divided into an L-shaped air inlet channel and a straight cylindrical liquid outlet channel. The top of the air inlet channel is higher than the liquid outlet channel, and the filter pad is arranged at the notch on the side of the rod seat.

[0011] For the above multi-connected intravenous infusion set, the filter pad is a detachable air filtration structure, and the rubber plug is used to seal the notch in the unused state, and a puncture guiding mark is provided on the surface of the rubber plug.

[0012] For the above multi-connected intravenous infusion set, the groove box of the flow regulator is provided with an inclined chute. When the roller moves along the chute, the distance between the axis of the roller and the axis of the injection pipeline changes linearly, and the pipe diameter is adjusted by progressive compression.

[0013] The above-mentioned multi-channel intravenous infusion set, wherein the drip chamber is a transparent cylindrical structure, with a dropper at the top. A reduced-diameter structure is formed at the connection between the end of the dropper and the liquid injection pipeline, causing the liquid medicine to fall in the form of liquid drops.

[0014] The above-mentioned multi-channel intravenous infusion set, wherein both the liquid delivery pipeline and the liquid injection pipeline are made of transparent medical-grade PVC material, and flow rate scale marks are provided on the outer side of the pipeline wall.

[0015] The above-mentioned multi-channel intravenous infusion set, wherein the liquid inlet and the liquid outlet are respectively controlled to open and close through pipe clamps, and the supplementary liquid port is provided with a rubber stopper.

[0016] The rubber stopper at the supplementary liquid port of the above-mentioned multi-channel intravenous infusion set is made of self-sealing silica gel material, and a cross-shaped pre-cut is provided on the surface for automatic closing after being punctured by a syringe.

[0017] The beneficial effects of the present invention are as follows: 1. Sequential control automation and anti-mixing: The communicator uses the mechanical balance of the liquid medicine pressure and the spring to drive the slider, automatically completing the operation of switching to the next liquid medicine after the previous liquid medicine has flowed out, without manual intervention. The first branch pipe and the second branch pipe converge through the fourth branch pipe and then are connected to the third branch pipe to form a physically isolated infusion path. Combined with the one-way shielding of the slider for the diversion port, the mixing risk of different liquid medicines in the pipeline is completely isolated.

[0018] 2. Improvement of liquid medicine flow stability: The independent air intake channel of the communicator is connected to the external atmosphere through a filter pad to balance the air pressure inside and outside the liquid medicine bottle in real time, avoiding liquid medicine interruption or bubble generation caused by negative pressure. The flow regulator of the liquid injection pipeline adopts a linkage design of a roller and an inclined chute, and keeps the flow rate constant through a linear change in the pipeline cross-sectional area, especially suitable for high-viscosity liquid medicines (error rate < 5%).

[0019] 3. Convenience and safety of supplementary liquid operation: The supplementary liquid port is provided with a self-closing silica gel plug, which supports automatic sealing after being punctured by a syringe for adding medicine, without the need to pause the infusion or disassemble the pipeline, reducing the operation steps and the probability of contamination. The supplementary liquid medicine is directly injected into the bag body and uniformly output through the liquid outlet, avoiding cross-contamination with the main infusion liquid medicine. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the embodiment.

[0021] Figure 2 It is a schematic diagram of the structure of the bag body.

[0022] Figure 3 It is a schematic diagram of the structure of the liquid delivery assembly.

[0023] Figure 4 It is a schematic cross-sectional structure diagram of the communicator.

[0024] Figure 5 It is a schematic structural diagram of a current converter.

[0025] Figure 6 It is a schematic structural diagram of a liquid injection assembly.

[0026] Figure 7 It is a schematic structural diagram of a drip chamber and a flow regulator.

[0027] Figure 8 It is a schematic structural diagram of a needle.

[0028] In the figure: 1. Bag body; 11. Hanging groove; 12. Liquid inlet; 13. Liquid discharge port; 14. Supplementary liquid port; 15. Pipe clamp; 2. Liquid delivery assembly; 21. Liquid delivery pipeline; 22. First branch pipe; 23. Second branch pipe; 24. Third branch pipe; 25. Communicator; 251. Needle rod; 252. Rod seat; 2511. Liquid outlet channel; 2512. Air inlet channel; 2521. Notch; 2522. Rubber stopper; 26. Fourth branch pipe; 27. Current converter; 271. Housing; 272. End cover; 273. Slide block; 274. Spring; 2711. First shunt port; 2712. Second shunt port; 2713. Confluence port; 3. Liquid injection assembly; 31. Liquid injection pipeline; 32. Drip chamber; 33. Flow regulator; 34. Needle; 321. Dropper; 331. Groove box; 332. Roller; 333. Slide groove; 341. Needle seat; 342. Protective sleeve. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Embodiment

[0030] The present application relates to a multi-channel intravenous infusion set, such as Figure 1-8As shown in the figure, the infusion set includes a bag body 1, which is made of medical-grade transparent PVC material and is in the shape of a rectangular flat sac arranged vertically. A detachable rigid plastic hanging groove 11 is provided at the top for hanging on an infusion stand. The height of the bag body 1 is 20 - 30 cm, the width is 10 - 15 cm, the thickness is 2 - 3 cm, and the internal volume is 200 - 300 mL. Three connected universal interfaces are provided at the bottom of the bag body 1, which are arranged horizontally in sequence as the liquid inlet 12, the liquid outlet 13, and the supplementary liquid port 14. The liquid inlet 12 is located on the left side and is connected to the liquid delivery component 2 through a medical-grade silicone hose. A clamp 15 is configured at the interface for blocking or releasing the output of the liquid medicine. The liquid outlet 13 is located in the middle and is connected to the liquid injection component 3 through a medical-grade silicone hose. A clamp 15 is configured at the interface. The supplementary liquid port 14 is located on the right side and adopts a Luer connector structure. A medical rubber sealing plug is embedded in the interface, and the surface of the sealing plug is covered with an easily punctured diaphragm for supplementing the liquid medicine through a syringe. The liquid delivery component 2 can be connected to three different bottles of liquid medicine at the same time. By switching the opening and closing states of the independent pipelines and adjusting the flow rate, the liquid medicine can be input into the bag body 1 at different times according to the preset sequence to avoid drug mixing. The liquid injection component 3 is used to monitor the flow rate of the liquid medicine in real time to ensure the stable delivery of the liquid medicine to the patient's body. In this embodiment, through the combined design of the multi-channel liquid delivery component 2 and the bag body 1, the functions of multi-drug input at different times, temporary liquid supplement, and temporary storage and buffering are realized, reducing the risk of drug cross-contamination; the transparent material of the bag body 1 can directly observe the remaining liquid volume, and the rectangular structure improves the space utilization rate.

[0031] The liquid delivery pipeline 21 is made of medical-grade transparent PVC material. One end of it is connected to the liquid inlet of the bag body 1, and the other end extends outward to form a branch pipeline system for simultaneously accessing multiple bottles of liquid medicine and controlling their input sequence. At the branch end of the liquid delivery pipeline 21, the first branch pipe 22, the second branch pipe 23, and the third branch pipe 24 are arranged side by side. A connector 25 is provided at the top of each branch pipe. The connector is used to puncture the liquid medicine bottle and guide the liquid medicine into the liquid delivery pipeline 21. It includes a needle rod 251 and a rod seat 252. The needle rod 251 is a medical stainless steel tubular structure with a hollow interior, 40 - 50 mm in length and 1.5 - 2 mm in diameter. Its end is fixed in the central hole of the rod seat 252 by interference fit. The inside of the needle rod 251 adopts a sandwich design, which is divided into two independent liquid outlet channels 2511 and air inlet channels 2512. The liquid outlet channel 2511 runs through the entire length of the needle rod 251 and is in a straight tube shape, used to guide the liquid medicine into the liquid delivery pipeline 21. The air inlet channel 2512 is arranged parallel to the liquid outlet channel 2511. The bottom end bends towards the side wall of the needle rod 251 to form an L-shaped elbow. The opening height of the top end of the air inlet channel 2512 is 5 - 8 mm higher than that of the top end of the liquid outlet channel 2511 to prevent air from mixing into the liquid outlet channel 2511 during air intake, resulting in liquid medicine backflow. The rod seat 252 is made of medical polycarbonate material and is a cylindrical hollow shell 271. A notch 2521 communicating with the air inlet channel 2512 is opened on its side wall. A detachable filter pad is embedded in the notch. The filter pad is made of a hydrophobic polytetrafluoroethylene membrane with a filtration accuracy of 0.22 μm, used to filter the air entering the liquid medicine bottle and avoid microbial contamination. The outer surface of the notch is covered with a rubber plug 2522. The rubber plug is made of medical silicone material and is fixed to the rod seat 252 through a snap structure. It closes the notch when not in use to protect the filter pad from contamination. Through the sandwich channel design, physical isolation of air and liquid medicine is achieved, eliminating cross-contamination. The filter pad can intercept microorganisms and particulate matter, and the rubber plug provides sealing protection in the unused state. The design of the height difference of the L-shaped elbow of the air inlet channel 2512 avoids air backflow into the liquid outlet channel 2511, causing liquid medicine bubbles. The filter pad and the rubber plug can be separately disassembled and replaced, reducing maintenance costs.

[0032] The ends of the first branch pipe 22 and the second branch pipe 23 converge through the fourth branch pipe 26, and after further converging with the end of the third branch pipe 24, they are connected to the liquid delivery pipeline 21. Flow regulators 27 are provided at the confluence of the first branch pipe 22 and the second branch pipe, and at the confluence of the third branch pipe 24 and the fourth branch pipe. The flow regulator 27 includes a housing 271, an end cover 272, a slider 273 and a spring 274. The housing 271 is made of medical-grade polycarbonate and is a horizontally arranged cylindrical hollow cylinder with an inner diameter of 8-10 mm and a length of 50-60 mm. The two ends of the housing 271 are provided with internal threads, which are threadedly connected with the external threads of the end cover 272. Two shunt ports are symmetrically opened on one side of the housing 271, which are divided into a first shunt port 2711 and a second shunt port 2712, and the distance between the two shunt ports is 20-25 mm. In the middle of the other side of the housing 271, there is a confluence port 2713, which is located below the midpoint of the connection line of the shunt ports, and its diameter is the same as that of the shunt ports, which is 3-4 mm. The slider 273 is made of cylindrical polytetrafluoroethylene (PTFE), and its outer diameter is 0.2-0.3 mm smaller than the inner diameter of the housing 271 to ensure sliding tightness. The spring 274 is wound with stainless steel wire, and its elastic coefficient is 5-8 N / mm. The two ends are respectively fixed between the end face of the slider 273 and the end face of the end cover 272. Under normal conditions, the spring 274 keeps the slider 273 at the center position of the housing 271. When the spring 274 is not compressed, the slider 273 is at the center of the housing 271, and all the shunt ports are covered by the wall surface of the slider 273. When the first medicine bottle is connected through the first shunt port, the medicine pressure (≥0.1 MPa) pushes the slider 273 to slide to the opposite side, compressing the spring 274 on that side, and immediately exposing the first shunt port and the confluence port. The medicine is output through the confluence port. At this time, the second shunt port is completely covered by the slider 273. Subsequently, the second medicine bottle and the third medicine bottle are connected in turn for standby. When the first medicine bottle is emptied and the pressure disappears, the spring 274 pushes the slider 273 to reset to the center, and both the shunt ports and the confluence port are covered. The medicine enters from the second shunt port, pushing the slider 273 to slide in the reverse direction, opening the second shunt channel. By alternately connecting the medicine bottles and repeating the above process, the sequential switching and delivery of multiple medicines are realized. The pre-tightening force of the spring 274 is set to 0.05-0.08 MPa to ensure that the slider 273 only displaces when the medicine hydraulic pressure exceeds the threshold. When it exceeds the threshold, the slider 273 displaces. The cross-sectional area ratio of the shunt port to the cross-sectional area of the infusion pipeline is 1:1.2-1.5 to avoid the turbulent mixing of the medicine caused by the sudden change in flow rate. When used for the first time, it is necessary to first connect the first medicine bottle and start the infusion. After the slider 273 is completely displaced to one end, the subsequent medicine bottles can be connected. This design drives the mechanical movement of the slider 273 through hydraulic pressure, and can realize the dynamic switching of the medicine channel without external control components, avoiding the risk of electric control failure. The synergistic effect of the slider 273 and the spring 274 ensures that the channel is automatically blocked after the medicine is drained, preventing air from entering or the medicine from flowing back.

[0033] The liquid injection assembly 3 is composed of a liquid injection pipeline 31, a drip chamber 32, a flow regulator 33 and a needle 34, which are connected in series in sequence according to the liquid medicine flow direction. The liquid injection pipeline 31 is made of medical-grade transparent PVC, with an outer diameter of 3.5 - 4 mm and an inner diameter of 2 - 2.5 mm. It is used to connect the liquid delivery pipeline 21 and the drip chamber 32. The whole transparent design supports real-time flow rate monitoring. Both ends are equipped with Luer connectors to ensure sealed connection with the drip chamber 32 and the needle 34. The drip chamber 32 is in a vertical cylindrical shape, with a height of 80 - 100 mm and an inner diameter of 15 - 20 mm. The material is medical-grade polypropylene PP. A dropper 321 with a conical structure is inserted into the top of the drip chamber 32, and the outlet aperture is 0.5 - 0.8 mm. The liquid drop volume is controlled at 0.05 - 0.1 mL / drop.A cavity with a height of 30 - 40 mm is reserved at the lower part of the drip chamber 32 for temporarily storing the liquid medicine and slowing down the flow rate fluctuation. The liquid medicine enters the buffer chamber in the form of drops through the dropper 321. Medical staff estimate the infusion rate by counting the number of drops (such as 20 drops / min). The change in the liquid level height in the buffer chamber can absorb the upstream pressure fluctuation and prevent the sudden change in flow rate from causing venous irritation to the patient. The flow regulator 33 is composed of a groove box 331 and a roller 332. The groove box 331 is made of ABS material, and two parallel sliding grooves 333 are arranged inside. The inclination angle of the slide rail is 15° - 30°, and the distance between the slide rails matches the diameter of the roller 332 (10 - 12 mm). The roller 332 is made of engineering plastic material, with anti-slip patterns on the surface. The outer diameter is 1 - 1.5 mm larger than the outer diameter of the liquid injection pipeline 31. Initially, the roller 332 is located at the highest point of the sliding groove 333, and the liquid injection pipeline 31 is in a natural expansion state, with the maximum flow rate (such as 100 mL / h). By sliding the roller 332 downward, the distance between the axis of the roller 332 and the axis of the pipeline decreases, and the pipeline is gradually compressed, and the flow rate decreases linearly (down to 10 mL / h at the lowest). By pushing the roller 332 in the reverse direction, the pipeline can rebound and restore the through diameter, and the flow rate increases synchronously. The needle 34 is made of medical stainless steel, with an outer diameter of 0.8 - 1.2 mm. The inner cavity is a tapered and gradually shrinking channel, and the end acute angle is 25° - 30°, ensuring smooth puncture and reducing tissue damage. The needle hub 341 is sleeved and arranged at the end of the needle 34 and adopts a Luer locking structure, which is hermetically connected to the end of the liquid injection pipeline 31. The needle 34 is covered with a PE protective sleeve 342, which needs to be rotated and removed before use. By connecting the liquid injection pipeline 31 to the outlet end of the liquid delivery pipeline 21 through a Luer connector, inserting the needle 34 into the patient's vein, and resetting the roller 332 of the flow regulator 33 upward to keep the liquid injection pipeline 31 at the maximum through diameter, the liquid medicine forms continuous drops through the drip chamber 32. According to the doctor's order, slide the roller 332 to the target position, and calibrate the flow rate through the drop frequency of the drip chamber 32 (such as 30 drops / min ≈ 60 mL / h). During the infusion process, the roller 332 can be fine-tuned at any time to cope with the patient's blood pressure change or the viscosity of the liquid medicine. The inclined plane design of the sliding groove 333 converts the manual displacement into a linear flow rate change, and the adjustment resolution reaches ±2 mL / h. The liquid level height in the buffer chamber of the drip chamber 32 is always higher than the needle 34, using the gravity difference to block the entry of air or blood reflux. The tapered design of the inner cavity of the needle 34 adapts to liquid medicines with different viscosities such as mannitol hypertonic solution or fat emulsion, with a flow rate deviation < 5%. The volume error of the drops in the drip chamber 32 ≤ ±0.02 mL, the flow rate estimation error < 3%. The flow regulation range of the roller 332 is 10 - 150 mL / h (the corresponding value for the full stroke of the roller 332), supporting fine-tuning scale markings. The liquid injection pipeline 31 has no rupture under the maximum pressure of the roller 332 (the test pressure ≥ 0.3 MPa).

[0034] Usage method: First, remove the rubber stopper on the side of the connector rod base 252 to expose the filter pad. Check the integrity of the filter pad for no damage or contamination. Vertically insert the needle rod 251 of the connector into the rubber stopper of the first liquid medicine bottle, ensuring that the needle rod 251 completely penetrates below the liquid level in the bottle. Then, connect the confluence port of the communicator 27 to the liquid delivery pipeline 21 of the liquid injection assembly 3 through a medical-grade pipeline. Check the initial position of the slider 273. When not under pressure, the slider 273 should be centered, the through groove is misaligned with the confluence port, and the shunt ports are all in a shielded state. Immediately open the flow regulator 33 of the liquid injection assembly 3, slide the roller 332 to the maximum flow position, and by gently flicking the barrel of the drip chamber 32, fill the pipeline with the liquid medicine and discharge the air bubbles until continuous liquid medicine flows out from the needle 34.

[0035] Insert the needle 34 into the patient's vein. After fixation, adjust the flow regulator 33 to the doctor's order flow rate (such as 60 mL / h), calibrate the flow rate through the drip frequency of the drip chamber 32, and observe the state of the communicator 27. At this time, only the first shunt port is connected to the liquid medicine bottle. The hydraulic pressure pushes the slider 273 to slide to one end of the housing 271. The first shunt port and the confluence port are unblocked, and the liquid medicine continues to be output. When the liquid level in the liquid medicine bottle drops, the external air enters the bottle through the filter pad and the air intake channel 2512, and no air bubbles are mixed into the liquid outlet channel 2511. Monitor the drip stability of the drip chamber 32. If intermittent dripping occurs, check whether the slider 273 of the communicator 27 is stuck.

[0036] When the first liquid medicine bottle is emptied, the hydraulic pressure drops. The spring 274 of the communicator 27 pushes the slider 273 to reset to the central position, and the first shunt port is shielded. At this time, the hydraulic pressure of the second liquid medicine bottle pushes the slider 273 to slide in the opposite direction to the other side, and the through groove connects the second shunt port and the confluence port to resume the liquid medicine output. Calibrate the flow rate through the flow regulator 33 to ensure that the flow rate deviation before and after the switch is <5%. If it is necessary to stop the infusion urgently, slide the roller 332 of the flow regulator 33 downward until the pipeline is completely closed to cut off the liquid medicine flow. Through the mechanically hydraulic-driven communicator 27, the automatic sequential switching of multiple liquid medicine bottles is realized, avoiding the infusion interruption caused by manual operation. The double protection of the filter pad and the rubber stopper of the connector ensures the isolation of the internal and external environments of the liquid medicine bottle, meeting the requirements of aseptic operation. The spring 274 reset mechanism of the slider 273 of the communicator 27 can automatically block the empty bottle channel to prevent air from entering the pipeline. The clear pre-start conditions and steps, such as only connecting a single bottle for the first time, avoid the risk of switching failure caused by hydraulic conflict.

[0037] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part depending on the context, the term "one or more" used in the text can be used to describe any feature, structure, or property in the singular sense, or can be used to describe a combination of features, structures, or properties in the plural sense. Similarly, at least in part depending on the context, terms such as "a" or "the" can also be understood to convey singular usage or convey plural usage.

[0038] It should be readily understood that the terms "on", "above", and "over" in this disclosure should be interpreted in the broadest manner such that "on" not only means "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over something", but may also include the meaning of "above" or "over something" with no intervening features or layers therebetween (i.e., directly on something).

[0039] In addition, for ease of explanation, spatial relative terms may be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature to other elements or features as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation other than the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptors used in the text may be interpreted accordingly.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multi-channel intravenous infusion set, characterized in that: including a bag body, with a hanging groove at the top and a liquid inlet, a liquid outlet and a liquid replenishing port at the bottom; a liquid delivery assembly, including a liquid delivery pipeline connected to the liquid inlet, a plurality of branch pipes and a flow exchanger. The end of the liquid delivery pipeline bifurcates into a first branch pipe, a second branch pipe and a third branch pipe. The first branch pipe and the second branch pipe converge through a fourth branch pipe, and after the fourth branch pipe and the third branch pipe converge, they are connected to the liquid delivery pipeline. The flow exchanger is arranged at the branch pipe confluence, including a housing, a sliding block and a spring. The sliding block is driven by the liquid flow thrust to alternately close the diversion ports, so as to realize the sequential and independent delivery of multiple bottles of liquid medicine; a liquid injection assembly, including a liquid injection pipeline connected to the liquid outlet, a drip chamber and a flow regulator. The drip chamber is used for buffering the liquid medicine flow rate and observing the drip rate. The flow regulator linearly compresses the liquid injection pipeline through a roller to adjust the pipe diameter to control the infusion speed.

2. The multi-channel intravenous infusion set according to claim 1, wherein: The bag body is in a vertically arranged rectangular structure, made of medical-grade PVC material, and the liquid inlet, the liquid outlet and the liquid replenishing port are horizontally and equidistantly distributed along the bottom of the bag body.

3. The multi-channel intravenous infusion set according to claim 1, characterized in that: The housing of the flow exchanger is in a horizontal cylindrical structure, and the end caps are connected by threads at both ends. The springs on both sides of the sliding block abut against the end caps, and the axes of the diversion ports and the confluence ports are vertically arranged.

4. The multi-channel intravenous infusion set according to claim 1, characterized in that: The liquid delivery assembly further includes a connector, which includes a double-channel needle rod, a filter pad and a rubber stopper. The inner part of the needle rod is divided into an L-shaped air inlet channel and a straight cylindrical liquid outlet channel. The top of the air inlet channel is higher than the liquid outlet channel, and the filter pad is arranged at the notch on the side of the rod base.

5. The multi-channel intravenous infusion set according to claim 4, wherein: The filter pad is a detachable air filtration structure, and the rubber stopper is used to seal the notch in the unused state, and a puncture guiding mark is provided on the surface of the rubber stopper.

6. The multi-channel intravenous infusion set according to claim 1, characterized in that: An inclined chute is arranged in the groove box of the flow regulator. When the roller moves along the chute, the distance between its axis and the axis of the liquid injection pipeline changes linearly, and the pipe diameter is adjusted by progressive compression.

7. The multi-channel intravenous infusion set according to claim 1, wherein: The drip chamber is in a transparent cylindrical structure, with a dropper at the top. The connection between the end of the dropper and the liquid injection pipeline forms a reduced-diameter structure, so that the liquid medicine falls in the form of liquid drops.

8. The multi-channel intravenous infusion set according to claim 1, wherein: Both the liquid delivery pipeline and the liquid injection pipeline are made of transparent medical-grade PVC material, and flow rate scale marks are provided on the outer side of the pipe wall.

9. The multi-channel intravenous infusion set according to claim 1, wherein: The liquid inlet and the liquid outlet are respectively controlled to open and close through pipe clamps, and the liquid replenishing port is provided with a rubber stopper.

10. The multi-channel intravenous infusion set according to claim 9, wherein: The rubber stopper of the liquid replenishing port is made of self-sealing silica gel material, and a cross-shaped pre-cut is provided on the surface for automatic closing after being punctured by a syringe.

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