Infusion set with switchable filter channel

Abstract

The application relates to the technical field of medical devices, in particular to an infusion device with switchable filtering channels; a channel switching assembly comprises a shell, a plurality of infusion tube limiting grooves arranged in the shell, a lock tongue movable groove communicated with the infusion tube limiting grooves, and a rotating adjusting cavity communicated with the lock tongue movable groove; when used, an infusion tube guide groove communicated with the infusion tube limiting grooves is further arranged on the outer wall of the shell, so that the infusion tube limiting groove is embedded in the infusion tube limiting groove. In the application, the swing arm is driven to rotate by a servo motor, the cooperation of the slope-shaped adjusting block and the telescopic adjusting knob can realize the automatic sequential switching of the plurality of infusion channels, manual intervention is not needed, and the workload of nurses is greatly reduced. Liquid monitoring sensors are arranged above and below the liquid collecting observation bottle, whether the liquid in the current channel is infused is judged in real time, signals are sent to the controller, the switching to the next channel is automatically controlled by the controller, and full-automatic infusion is realized.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an infusion set with switchable filter channels. Background Technology

[0002] Chemotherapy patients often require multiple infusion set changes per infusion session because different chemotherapy drugs have different filtration requirements: chemotherapy regimens often involve the combined use of multiple drugs, and these drugs differ in molecule size, irritancy, and compatibility, necessitating infusion sets with different filtration pore sizes. For example, some drugs require 0.22μm filters to intercept particulate matter, while paclitaxel-based drugs require phthalate-free PP infusion sets to avoid drug adsorption or material reactions.

[0003] Traditional infusion sets have a single filtration channel structure. When chemotherapy regimens involve multiple drugs that require different filtration precision, medical staff need to frequently change the entire infusion set when infusing different drugs. This not only increases the workload of nurses, but also brings the following problems: (1) Frequent changes of infusion sets can easily lead to drug waste and chemotherapy drug spillage; (2) Multiple punctures of the infusion bottle increase the risk of particulate contamination; (3) Improper operation during the replacement process may introduce air or contaminants.

[0004] While there are some multi-channel infusion set designs in the existing technology, most of them have the following shortcomings: First, channel switching relies on manual operation and cannot achieve automated sequential control; second, there is a lack of real-time monitoring of the infusion status of each channel, making it impossible to accurately determine whether a single bottle of medicine has been finished; third, there is a lack of automatic flushing function when switching between different drug channels, posing a risk of drug incompatibility; and fourth, the switching mechanism of the filtration channel is complex and lacks reliability. Summary of the Invention

[0005] The purpose of this invention is to provide an infusion set with switchable filtration channels, which can automatically and sequentially switch between multiple infusion channels with different filtration accuracies; simplify channel switching operations, reduce nurses' workload, and improve infusion safety.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention provides an infusion set with switchable filter channels, comprising multiple infusion tubes with different filter channels; a plastic needle, a collection bottle, and a filter are arranged sequentially from top to bottom on the infusion tubes; the lower end of each infusion tube is connected to the same collection observation bottle, a catheter connected to the bottom of the collection observation bottle, and the infusion set needle through a medical multi-port valve; It also includes a channel switching component for controlling and adjusting the multiple infusion tubes; The channel switching component includes a housing, multiple infusion tube limiting grooves disposed inside the housing, a locking tongue movable groove communicating with the infusion tube limiting grooves, and a rotation adjustment cavity communicating with the locking tongue movable groove. In use, the outer wall of the housing is also provided with an infusion tube guide groove that communicates with the infusion tube limiting groove, so that the infusion tube can be embedded in the infusion tube limiting groove. A guide rod is provided between the rotary adjustment cavity and the movable groove of the locking tongue. One end of the guide rod is provided with a blocking locking tongue that faces the limiting groove of the infusion tube. A compression spring is provided on the guide rod and located in the movable groove of the locking tongue, which is used to squeeze and deform the infusion tube to block it. A telescopic adjustment lever is provided on the guide rod and located inside the rotary adjustment cavity; A rotating shaft extending to the rotary adjustment cavity is provided axially in the housing. The rotating shaft is driven by a servo motor. A swing arm is vertically provided on the rotating shaft. A ramp-shaped adjustment block for adjusting the position of the telescopic adjustment lever is provided on the swing arm.

[0007] Furthermore, a first liquid monitoring sensor and a second liquid monitoring sensor are respectively provided above and below the liquid collection observation bottle; wherein the first liquid monitoring sensor and the second liquid monitoring sensor are electrically connected to a controller.

[0008] Furthermore, the end face of the infusion tube limiting groove is an arc-shaped groove adapted to the outer diameter of the infusion tube, and the inner diameter of the arc-shaped groove is larger than the outer diameter of the infusion tube, so as to be deformed and blocked by compression.

[0009] Furthermore, the cross-section of the infusion tube guide groove is a fan-shaped groove radially opened in the housing; wherein the inner diameter of the fan-shaped groove is smaller than the outer diameter of the infusion tube to prevent it from scattering and falling off.

[0010] Furthermore, the blocking latch has a semi-cylindrical structure that adapts to the latch's movable groove.

[0011] Furthermore, the bottom of the telescopic adjustment lever is provided with a ramp to facilitate lifting in conjunction with the ramp-shaped adjustment block, thereby driving the blocking latch to disengage from the latch movable groove via the guide rod.

[0012] Furthermore, the blocking latch is guided by two parallel guide rods, the ends of which extend out of the housing and are then connected by a connecting rod. In use, the blocking latch can be manually adjusted to disengage from the latch movable groove, facilitating the placement of the infusion tube.

[0013] Furthermore, multiple infusion tube limiting grooves are evenly spaced on the circumferential sidewall of the housing of the channel switching component; multiple guide rods and telescopic adjustment levers corresponding to the infusion tube limiting grooves are provided in the rotary adjustment cavity; wherein, the servo motor drives the swing arm to rotate and swing through the rotating shaft, and the telescopic adjustment levers are adjusted to lift sequentially by the ramp-shaped adjustment blocks on the swing arm, wherein the clamping or opening of the infusion tube in the corresponding infusion tube limiting groove is adjusted according to the position of the ramp-shaped adjustment block; The filter has pore sizes of 0.2μm, 5μm, and 15μm; when different sizes of drug solutions are administered to the body, glucose or saline solution is administered between adjacent solutions.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention utilizes a servo motor to drive the swing arm's rotation. The combination of a ramp-shaped adjustment block and a telescopic adjustment lever enables automatic sequential switching of multiple infusion channels without manual intervention, significantly reducing nurses' workload. Furthermore, by installing liquid monitoring sensors above and below the collection observation bottle, the current channel's medication level can be determined in real time, and a signal is sent to the controller. The controller then automatically switches to the next channel, achieving fully automated infusion. Between infusion channels, the controller can control the infusion of glucose or saline to flush the tubing, preventing incompatibility caused by mixing different drugs and ensuring medication safety. Each infusion tube is equipped with filters of different pore sizes (e.g., 0.2μm, 5μm, 15μm), allowing selection of the appropriate channel based on the filtration requirements of different chemotherapy drugs, meeting diverse clinical needs. Each channel is equipped with an independent locking tongue and compression spring, achieving physical blocking by squeezing the infusion tube. This blocking is reliable and does not contact the medication, avoiding the risk of contamination. The connecting rod design allows for both automatic servo motor control and manual adjustment when needed, facilitating infusion tube installation and emergency operations. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the main structure of the infusion set with switchable filter channels according to the present invention; Figure 2 This is a schematic diagram of the channel switching component of the infusion set with switchable filter channels according to the present invention; Figure 3 This is a side view of the channel switching component; Figure 4 A schematic diagram of the horizontal cross-section of the channel switching component; Figure 5 for Figure 4 Schematic diagram of section AA; Figure 6 for Figure 4 Schematic diagram of the middle BB section; Figure 7 This is a schematic diagram showing the adjustment mechanism of the telescopic adjustment lever.

[0016] Explanation of reference numerals in the attached drawings: 1. Channel switching component; 11. Infusion tube limiting groove; 111. Infusion tube guide groove; 12. Locking tongue movable groove; 13. Blocking locking tongue; 14. Guide rod; 141. Telescopic adjustment lever; 142. Connecting rod; 15. Compression spring; 16. Servo motor; 116. Rotating shaft; 162. Swing arm; 163. Inclined adjustment block; 21. Plastic needle; 22. Collection bottle; 23. Infusion tube; 24. Filter; 25. Medical multi-port valve; 26. Collection observation bottle; 261. First liquid monitoring sensor; 262. Second liquid monitoring sensor; 27. Infusion set needle. Detailed Implementation

[0017] This embodiment discloses an infusion set with switchable filtration channels, including multiple infusion tubes 23 with different filtration channels. In this embodiment, there are three infusion tubes 23, each corresponding to a channel with a different filtration precision. Each infusion tube 23 is provided with, from top to bottom, a plastic needle 21 (for puncturing the infusion bottle), a collection bottle 22 (or drip chamber, for observing the drip rate and storing a small amount of medication), and a filter 24. The lower ends of the three infusion tubes 23 are connected to the same collection observation bottle 26 via a medical multi-port valve 25. The bottom of the collection observation bottle 26 is connected to a conduit, and the end of the conduit is provided with an infusion set needle 27.

[0018] refer to Figure 2 and Figure 3 The channel switching component 1 includes a housing, inside which are provided a plurality of infusion tube limiting grooves 11, each corresponding to an infusion tube 23. The end face of the infusion tube limiting groove 11 is an arc-shaped groove adapted to the outer diameter of the infusion tube 23, and the inner diameter of the arc-shaped groove is slightly larger than the outer diameter of the infusion tube 23, so that the infusion tube 23 can deform and be blocked when squeezed.

[0019] The outer wall of the housing is provided with an infusion tube guide groove 111 that connects to the infusion tube limiting groove 11. The cross-section of the infusion tube guide groove 111 is a fan-shaped groove opened radially in the housing. The inner diameter of the fan-shaped groove is smaller than the outer diameter of the infusion tube 23 to prevent the infusion tube 23 from scattering and falling off. In use, the infusion tube 23 is fixed and embedded in the infusion tube limiting groove 111 by the infusion tube guide groove 111.

[0020] A locking tongue movable groove 12 is provided in communication with the infusion tube limiting groove 11, and a slidable blocking locking tongue 13 is provided in the locking tongue movable groove 12. The blocking locking tongue 13 is a semi-cylindrical structure adapted to the locking tongue movable groove 12, with one end facing the infusion tube limiting groove 11. The distal end of the locking tongue movable groove 12 is connected to a rotation adjustment cavity 17.

[0021] A guide rod 14 is provided between the rotary adjustment cavity 17 and the locking tongue movable groove 12, and one end of the guide rod 14 is fixedly connected to the blocking locking tongue 13. A compression spring 15 is sleeved on the guide rod 14 and located inside the locking tongue movable groove 12. One end of the compression spring 15 abuts against the inner wall of the locking tongue movable groove 12, and the other end abuts against the blocking locking tongue 13, for applying a spring force to the blocking locking tongue 13 in the direction of the infusion tube limiting groove 11, so that the blocking locking tongue 13 squeezes the infusion tube 23 and deforms it to block it. In this embodiment, the blocking locking tongue 13 is adjusted and guided by two parallel guide rods 14 to ensure the smoothness of the movement of the blocking locking tongue 13.

[0022] A telescopic adjustment lever 141 is provided on the guide rod 14 and located within the rotary adjustment cavity 17. The bottom of the telescopic adjustment lever 141 has a ramp. A rotating shaft 116 extending into the rotary adjustment cavity 17 is axially provided on the housing, and the rotating shaft 116 is driven by a servo motor 16. A swing arm 162 is vertically provided on the rotating shaft 116, and a ramp-shaped adjustment block 163 is provided on the swing arm 162. When the servo motor 16 drives the rotating shaft 116 to rotate, the swing arm 162 swings accordingly. During the swinging process, the ramp-shaped adjustment block 163 sequentially contacts and engages with the bottom ramp of each telescopic adjustment lever 141, raising the corresponding telescopic adjustment lever 141. This causes the blocking latch 13 to retract through the guide rod 14, overcoming the elastic force of the compression spring 15, and disengaging from the latch movable groove 12, thus changing the corresponding infusion tube 23 from a blocked state to a conductive state.

[0023] The ends of the two guide rods 14 extend out of the housing and are connected by the connecting rod 142. When manual operation is required, the blocking latch 13 can be disengaged from the latch movable groove 12 by pressing or pulling the connecting rod 142, so as to place or remove the infusion tube 23.

[0024] refer to Figure 1A first liquid monitoring sensor 261 and a second liquid monitoring sensor 262 are respectively installed above and below the liquid collection observation bottle 26. Both are photoelectric sensors. The first liquid monitoring sensor 261 is used to monitor the upper limit of the liquid level in the liquid collection observation bottle 26, and the second liquid monitoring sensor 262 is used to monitor the lower limit of the liquid level in the liquid collection observation bottle 26. When the liquid level drops to the position of the second liquid monitoring sensor 262, it indicates that the medicine in the current channel is about to be finished, and the sensor sends a signal.

[0025] The first liquid monitoring sensor 261 and the second liquid monitoring sensor 262 are electrically connected to a controller. The controller receives the liquid level signals from the sensors and controls the operation of the servo motor 16 according to preset control logic.

[0026] The controller's control is far from the following: In the initial state, the blocking tongues 13 of all channels squeeze the corresponding infusion tubes 23 under the action of the compression springs 15, so that all channels are blocked.

[0027] Then the infusion is started. The controller controls the servo motor 16 to drive the swing arm 162 to rotate to the position corresponding to the first channel. The ramp-shaped adjustment block 163 raises the telescopic adjustment lever 141 of the first channel, causing the blocking tongue 13 of the first channel to retract, the first channel to be opened, and the infusion of the first bottle of medicine begins.

[0028] The process also includes liquid level monitoring. After being filtered by filter 24 in the first channel, the medication enters the collection and observation bottle 26 through the medical multi-port valve 25, and is then administered to the patient via catheter and infusion needle 27. As the medication is continuously administered, the liquid level in the collection and observation bottle 26 gradually decreases.

[0029] Next, the channel switching occurs. When the liquid level drops to the position of the second liquid monitoring sensor 262, the sensor sends a signal to the controller. Upon receiving the signal, the controller controls the servo motor 16 to drive the swing arm 162 to continue rotating, causing the telescopic adjustment lever 141 of the first channel to disengage from the support of the ramp-shaped adjustment block 163. The blocking latch 13 of the first channel extends under the action of the compression spring 15, squeezing the infusion tube 23 of the first channel to block it. At the same time, the ramp-shaped adjustment block 163 moves to below the telescopic adjustment lever 141 corresponding to the second channel, raising it and opening the second channel.

[0030] The system also features automatic flushing; before or after switching to the second channel, the controller briefly opens the flushing fluid channel (containing glucose or saline) to flush the tubing between the medical multi-port valve 25 and the infusion needle 27, preventing the medication from mixing with the medication in the second channel and causing incompatibility. The above steps are repeated until all channels have been infused.

[0031] In this embodiment, the infusion set has three channels, each equipped with a filter 24 of different pore sizes. Specifically: the filter 24 of the first channel has a pore size of 0.22 μm, suitable for immunotherapy drugs that require precise filtration; the filter 24 of the second channel has a pore size of 5 μm, suitable for most conventional chemotherapy drugs. When the 5 μm filter is used with platinum-based chemotherapy drugs, some platinum-based chemotherapy drugs (such as cisplatin, carboplatin, and nedaplatin) need to be protected from light, which is specifically achieved using a light-protected delivery device. The plastic needle 21, the collection bottle 22, and the infusion tubing 23 are made of ultra-low density polyethylene (PE) with an outer composite light-protected coating; the filter 24 of the third channel has a pore size of 15 μm, suitable for special drugs such as paclitaxel (albumin-bound).

[0032] The filter 24 of each channel is made of low-adsorption polyethersulfone (PES) material. For the dedicated channel for paclitaxel drugs, the filter 24 and the infusion tubing 23 are made of polypropylene (PP) material that does not contain phthalates (DEHP).

[0033] When switching between different drug channels, the controller controls the input of glucose or saline to flush the tubing, with a flushing volume of 5-10 mL, to ensure that any residual drug in the tubing is thoroughly rinsed out.

[0034] The infusion set described in this invention is a single-use medical device. The housing and internal components of the channel switching assembly 1 are injection molded from medical-grade plastic. The servo motor 16 is a reusable drive unit detachably connected to the housing. Components in direct contact with the medication—including the plastic needle 21, collection bottle 22, infusion tubing 23, filter 24, medical multi-port valve 25, collection observation bottle 26, and infusion set needle 27—are all made of medical-grade materials conforming to GB 8368 standards, individually packaged after ethylene oxide sterilization, and are for single use only.

[0035] The housing of the channel switching component 1 is provided with a one-time use mark and an anti-reuse structure to ensure that it cannot be reassembled and used after use.

[0036] Working principle Medical staff determine the required number of filtration channels and the corresponding filter pore size specifications based on the chemotherapy regimen. Each infusion tube 23 is then inserted into its corresponding infusion tube limiting groove 11 through the infusion tube guide groove 111 on the housing. At this point, each blocking latch 13 extends under the action of the compression spring 15, squeezing the corresponding infusion tube 23 to block it. The plastic needle 21 at the upper end of each infusion tube 23 is then inserted into its corresponding medication bottle (or medication bag).

[0037] When the infusion is started, the controller receives the start command and sends a control signal to the servo motor 16. The servo motor 16 drives the rotating shaft 116 to rotate, causing the swing arm 162 to swing. The ramp-shaped adjustment block 163 on the swing arm 162 moves with the swing arm 162 to the position of the telescopic adjustment lever 141 corresponding to the first channel.

[0038] Because the bottom of the telescopic adjustment lever 141 is sloped, when the sloped adjustment block 163 is inserted into the bottom of the telescopic adjustment lever 141, the telescopic adjustment lever 141 is raised, and through the guide rod 14, the blocking latch 13 overcomes the elastic force of the compression spring 15 and retracts into the latch movable groove 12. At this time, the infusion tube 23 of the first channel is released from compression, restores its elastic deformation, and becomes conductive. The first bottle of medicine enters the collection bottle 22 through the plastic needle 21, and after being filtered by the filter 24, it enters the collection observation bottle 26 through the medical multi-port valve 25, and is finally injected into the patient's body through the catheter and infusion set needle 27.

[0039] As the medicine is continuously infused, the liquid level in the collection and observation bottle 26 gradually decreases. When the liquid level drops to the position of the second liquid monitoring sensor 262, the second liquid monitoring sensor 262 sends an electrical signal to the controller. After receiving the signal, the controller sends the next command to the servo motor 16.

[0040] The servo motor 16 continues to drive the rotating shaft 116 to rotate, and the swing arm 162 continues to swing. The ramp-shaped adjustment block 163 moves out from the bottom of the telescopic adjustment lever 141 of the first channel. The telescopic adjustment lever 141 of the first channel is reset under the action of gravity and the guide rod 14. The blocking latch 13 extends under the action of the compression spring 15, squeezing the infusion tube 23 of the first channel to block it.

[0041] At the same time, the ramp-shaped adjusting block 163 moves below the telescopic adjusting lever 141 of the second channel and raises it, causing the blocking latch 13 of the second channel to retract and the second channel to open. The second bottle of medicine begins to be infused.

[0042] When the controller determines that the medication in the first channel has finished infusion and is ready to switch to the second channel, the controller first briefly opens the flushing fluid channel (e.g., for 3-5 seconds) to allow glucose or saline to enter the medical multi-port valve 25 and downstream tubing, flushing away any remaining medication from the first channel. Then, the second channel is opened. The amount of flushing fluid and the flushing time are automatically controlled by the controller according to a preset program.

[0043] The above steps are repeated sequentially until all channels have been infused with the medication in the preset order. When the last bottle of medication is infused and the liquid level in the collection observation bottle 26 drops to the position of the second liquid monitoring sensor 262, the controller issues an infusion completion prompt (such as an audible and visual alarm) and automatically closes all channels.

[0044] In special circumstances (such as installing infusion tubing, emergency treatment, etc.), medical staff can manually press the connecting rod 142 to disengage the blocking latch 13 from the latch movable groove 12, thereby releasing or repositioning the infusion tubing 23. Manual operation and automatic control complement each other, improving the flexibility and safety of equipment use.

[0045] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An infusion set with switchable filter channels, comprising multiple infusion tubes (23) with different filter channels; a plastic needle (21), a collection bottle (22), and a filter (24) are arranged sequentially from top to bottom on the infusion tubes (23); the lower end of each infusion tube (23) is connected to the same collection observation bottle (26), a catheter connected to the bottom of the collection observation bottle (26), and an infusion set needle (27) through a medical multi-port valve (25); Its features are: It also includes a channel switching assembly (1) for controlling and adjusting the multiple infusion tubes (23); The channel switching component (1) includes a housing, a plurality of infusion tube limiting grooves (11) disposed inside the housing, a locking tongue movable groove (12) communicating with the infusion tube limiting grooves (11), and a rotation adjustment cavity (17) communicating with the locking tongue movable groove (12). In use, the outer wall of the shell is also provided with an infusion tube guide groove (111) that connects to the infusion tube limiting groove (11), so that the infusion tube (23) can be limited and embedded in the infusion tube limiting groove (11); A guide rod (14) is provided between the rotary adjustment cavity (17) and the locking tongue movable groove (12). One end of the guide rod (14) is provided with a blocking locking tongue (13) facing the infusion tube limiting groove (11). A compression spring (15) is provided on the guide rod (14) and located in the locking tongue movable groove (12) for squeezing and deforming the infusion tube (23) to block it. A telescopic adjustment lever (141) is provided on the guide rod (14) and inside the rotary adjustment cavity (17). A rotating shaft (116) extending to the rotary adjustment cavity (17) is provided axially on the housing. The rotating shaft (116) is driven by a servo motor (16). A swing arm (162) is vertically provided on the rotating shaft (116). A ramp-shaped adjustment block (163) for adjusting the position of the telescopic adjustment lever (141) is provided on the swing arm (162).

2. The infusion set with switchable filter channels according to claim 1, characterized in that: A first liquid monitoring sensor (261) and a second liquid monitoring sensor (262) are respectively provided above and below the liquid collection observation bottle (26); wherein the first liquid monitoring sensor (261) and the second liquid monitoring sensor (262) are electrically connected to a controller.

3. The infusion set with switchable filter channels according to claim 1, characterized in that: The end face of the infusion tube limiting groove (11) is an arc-shaped groove adapted to the outer diameter of the infusion tube (23). The inner diameter of the arc-shaped groove is larger than the outer diameter of the infusion tube (23) so that it can be deformed and blocked by compression.

4. The infusion set with switchable filter channels according to claim 3, characterized in that: The cross-section of the infusion tube guide groove (111) is a fan-shaped groove opened radially in the shell; wherein the inner diameter of the fan-shaped groove is smaller than the outer diameter of the infusion tube (23) to prevent it from scattering and falling off.

5. The infusion set with switchable filter channels according to claim 1, characterized in that: The blocking latch (13) is a semi-cylindrical structure that is adapted to the latch movable groove (12).

6. The infusion set with switchable filter channels according to claim 1, characterized in that: The bottom of the telescopic adjustment lever (141) is provided with a ramp so as to cooperate with the ramp-shaped adjustment block (163) to lift it, thereby driving the blocking latch (13) to disengage from the latch movable groove (12) through the guide rod (14).

7. The infusion set with switchable filter channels according to claim 6, characterized in that: The blocking tongue (13) is guided by two parallel guide rods (14), the ends of which extend out of the housing and are connected by a connecting rod (142). In use, the blocking tongue (13) can be disengaged from the tongue movable groove (12) by manually adjusting the connecting rod (142) to facilitate the placement of the infusion tube (23).

8. The infusion set with switchable filter channels according to claim 1, characterized in that: Multiple infusion tube limiting grooves (11) are evenly spaced on the circumferential sidewall of the housing of the channel switching assembly (1); multiple guide rods (14) and telescopic adjustment paddles (141) corresponding to the infusion tube limiting grooves (11) are provided in the rotary adjustment cavity (17); wherein, the servo motor (16) drives the swing arm (162) to rotate and swing through the rotating shaft (116), and the ramp-shaped adjustment block (163) on the swing arm (162) is used to adjust the telescopic adjustment paddles (141) to lift in sequence, wherein the clamping or opening of the infusion tube (23) in the corresponding infusion tube limiting groove (11) is adjusted according to the position of the ramp-shaped adjustment block (163); The filter (24) has pore sizes of 0.2μm, 5μm, and 15μm; when different sizes of drug solutions are administered to the body, glucose or saline solution is administered between adjacent channels.

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