Liquid medicine supply device and use method therefor

Abstract

Disclosed in the present application are a liquid medicine supply device and a use method therefor. The liquid medicine supply device comprises an injection tube, a first plunger, a liquid storage bag and a positive displacement pump. The injection tube is provided with a first end and a second end, which are opposite each other, wherein the first end is provided with a medicine feeding port and a medicine output port, which is configured to connect to an infusion tube; a limiting structure for stopping the plunger is provided at a position close to the second end inside the injection tube; and a sealable first exhaust port is provided in a first tube section between the limiting structure and the second end. The first plunger is arranged in a second tube section between the limiting structure and the first end; the liquid storage bag is used for storing a power fluid; and a liquid inlet of the positive displacement pump is connected to the liquid storage bag by means of tubing, and a liquid outlet of the positive displacement pump is connected to the first tube section by means of tubing. The liquid medicine supply device provided in the present application has a simple structure, thereby reducing the production and manufacturing costs; the phenomenon of the agglomeration of substances in a liquid medicine occurring during the delivery of the liquid medicine can be prevented, thereby reducing the impact of the delivery process on the efficacy of the medicine; in addition, the liquid medicine supply device also helps to improve the control precision for a medicine dose.

Description

A liquid medicine supply device and a method of using the same

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 16, 2023, with application number 202310717390.3 and invention name “A liquid medicine supply device and method of use thereof”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of medical devices, and in particular to a liquid medicine supply device and a method for using the same. Background Art

[0003] A liquid medicine supply device is needed in many scenarios, such as the timed and quantitative delivery of insulin to diabetic patients, and the timed and quantitative delivery of analgesics to postoperative patients. At present, a common liquid medicine supply device is to pump the liquid medicine into the patient's body through a positive displacement pump. Although it can simplify the structure and reduce costs compared to traditional liquid medicine supply devices, it still has certain shortcomings: the liquid medicine passes through a positive displacement pump and undergoes a process of suction and pumping. This process often causes substances such as active ingredients such as proteins and polypeptides in the liquid medicine to agglomerate, which in turn has an adverse effect on the efficacy of the medicine. Moreover, the liquid medicine has a variety of ingredients, and different liquid medicines may have large differences in viscosity. In order to achieve fine control of the amount of medicine, the pumping accuracy of the positive displacement pump has to be adjusted according to the liquid medicine, causing difficulties in the production or use of the equipment. Therefore, how to improve the liquid medicine supply device to overcome the above-mentioned shortcomings has become a technical problem that needs to be urgently solved by those skilled in the art.

[0004] Summary of the Invention

[0005] On the one hand, this application provides the following technical solutions:

[0006] A liquid medicine supply device, comprising:

[0007] An injection tube having a first end and a second end opposite each other, the first end being provided with a drug addition port and a drug discharge port for connection to an infusion tube, a position within the injection tube near the second end being provided with a stopper structure for stopping the piston, and a first tube section between the stopper structure and the second end being provided with a closable first exhaust port;

[0008] a first piston disposed in the second pipe section between the limiting structure and the first end;

[0009] Fluid storage bag, used to store power fluid;

[0010] A volumetric pump, wherein the liquid inlet of the volumetric pump is connected to the liquid storage bag via a pipeline, and the liquid outlet of the volumetric pump is connected to the first pipe section via a pipeline.

[0011] Optionally, the above-mentioned liquid medicine supply device further includes a pressure sensor arranged in the first pipe section.

[0012] Optionally, in the above-mentioned liquid medicine supply device, the volumetric pump is a diaphragm pump.

[0013] Optionally, in the above-mentioned liquid medicine supply device, the limiting structure is a ring rib provided on the inner wall of the injection tube.

[0014] Optionally, the above-mentioned liquid medicine supply device includes a controller electrically connected to the volumetric pump, and the controller is provided with a timing module.

[0015] Optionally, in the above-mentioned liquid medicine supply device, a sealing member for closing the first air outlet is provided at the first air outlet, and the sealing member is made of a material that can absorb the power fluid and swell.

[0016] Optionally, in the above-mentioned liquid medicine supply device, the medicine outlet is connected to a hose, and an electric-controlled liquid stop device or a manually controlled liquid stop clamp is provided at one end of the hose close to the liquid outlet, and a connector for connecting an infusion tube is provided at one end of the hose away from the liquid outlet.

[0017] Optionally, the above-mentioned liquid medicine supply device further includes a second piston arranged in the second pipe section, the second piston is located on the side of the first piston close to the medicine outlet, the second pipe section is provided with a closable second exhaust port, and the distance from the second exhaust port to the limiting structure matches the thickness of the first piston.

[0018] Optionally, the above-mentioned liquid medicine supply device further includes a temporary stopper arranged on the second pipe section, and the distance from the temporary stopper to the limiting structure matches the thickness of the first piston; wherein the temporary stopper has at least a first state and a second state, and in the first state, the temporary stopper protrudes from the inner wall of the injection tube, and in the second state, the temporary stopper does not protrude from the inner wall of the injection tube.

[0019] A method for using the above-mentioned liquid medicine supply device, the method comprising:

[0020] Step A, adding liquid medicine: with the medicine outlet closed and the first exhaust port open, injecting liquid medicine into the injection tube through the medicine adding port, so that the first piston originally at the first end is moved to the position of the limiting structure under the push of the medicine liquid, thereby closing the medicine adding port;

[0021] Step B, adding power fluid: with the first exhaust port facing upward, injecting part of the power fluid in the liquid storage bag into the injection tube by the positive displacement pump, so that the first tube section is filled with power fluid, and the first exhaust port is closed;

[0022] Step C, pushing the medicine liquid: opening the medicine outlet, and having the volume pump pump power liquid into the syringe, so that the first piston moves toward the first end under the push of the power liquid, thereby pushing the medicine liquid in the syringe into the infusion tube.

[0023] A method for using the above-mentioned liquid medicine supply device, the method comprising:

[0024] Step A, adding power fluid: switching the temporary stopper to the first state to engage the first piston originally located at the limiting structure, with the first exhaust port facing upward and open, injecting a portion of the power fluid in the liquid storage bag into the injection tube using the positive displacement pump, filling the first tube section with power fluid, and closing the first exhaust port;

[0025] Step B, adding liquid medicine: switching the temporary stopper to the second state, with the medicine outlet closed and the second exhaust port open, injecting liquid medicine into the injection tube through the medicine adding port, causing the second piston, originally at the first end, to move toward the second end under the push of the medicine until the second piston is in close contact with the first piston, thereby closing the medicine adding port and the second exhaust port;

[0026] Step C, pushing the medicine liquid: opening the medicine outlet, and having the volume pump pump power fluid into the syringe, so that the first piston and the second piston move toward the first end under the push of the power fluid, thereby pushing the medicine liquid in the syringe into the infusion tube.

[0027] The liquid medicine supply device provided by this application has the following beneficial effects:

[0028] After the volumetric pump pumps the power fluid in the liquid storage bag into the syringe, it uses the power fluid to push the piston in the syringe to move, thereby delivering the medicine in the syringe. This arrangement makes the overall structure of the medicine supply device relatively simple, reducing the production cost. Moreover, the medicine does not flow through the volumetric pump, avoiding the agglomeration of substances in the medicine during the delivery of the medicine, thereby reducing the impact of the delivery process on the efficacy of the medicine. In addition, even if the medicine to be supplied is different, the volumetric pump still pumps the same power fluid, so the pumping accuracy of the volumetric pump is not affected, which is conducive to improving the control accuracy of the medicine amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0030] FIG1 is a schematic diagram of a liquid medicine supply device provided in Example 1 of the present application;

[0031] FIG2 is a schematic diagram of a liquid medicine supply device provided in Example 2 of the present application;

[0032] FIG3 is a schematic diagram of a liquid medicine supply device provided in Example 3 of the present application.

[0033] Components marked in the figure are: 1. Injection tube; 11. Dosing port; 12. Dosing port; 13. Limiting structure; 14. First exhaust port; 15. Second exhaust port; 16. Temporary stopper; 21. First piston; 22. Second piston; 3. Pressure sensor; 4. Positive displacement pump; 41. Volume change driver; 42. Liquid outlet; 43. Liquid inlet; 5. Liquid storage bag; 51. Dosing port. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] Referring to Figure 1, the first embodiment of the present application provides a liquid medicine supply device, including a syringe 1, a first piston 21, a liquid storage bag 5 and a volumetric pump 4, wherein the syringe 1 has a first end and a second end relative to each other, the first end is provided with a drug addition port 11 and a drug outlet port 12 for connecting to an infusion tube, and the interior of the syringe 1 is provided with a limiting structure 13 for stopping the piston near the second end. The first pipe section between the limiting structure 13 and the second end is provided with a closable first exhaust port 14, and the first piston 21 is provided in the second pipe section between the limiting structure 13 and the first end, that is, the syringe 1 is divided into a first pipe section near the second end and a second pipe section near the first end by the limiting structure 13, and the first piston 21 can only move in the second pipe section. The liquid storage bag 5 is used to store power fluid, the liquid inlet 43 of the volumetric pump 4 is connected to the liquid storage bag 5 by a pipeline, and the liquid outlet 42 of the volumetric pump 4 is connected to the first pipe section by a pipeline.

[0036] Based on the liquid medicine supply device provided in Example 1, the present application provides a method for using the liquid medicine supply device, which includes the following steps:

[0037] S11, adding liquid medicine: when the medicine outlet 12 is closed and the first exhaust port 14 is opened, liquid medicine is injected into the injection tube 1 through the medicine adding port 11, so that the first piston 21 originally at the first end moves to the position of the limiting structure 13 under the push of the medicine liquid, and the medicine adding port 11 is closed.

[0038] The first piston 21 is originally at the first end, which means that in the factory state of the liquid medicine supply device, the volume of chamber A in Figure 1 is zero. Therefore, as the liquid medicine is continuously injected, the volume of chamber A continues to increase, and the gas on the other side of the first piston 21 is gradually discharged from the first exhaust port 14. When the first piston 21 moves to the position of the limiting structure 13, it is blocked by the limiting structure 13 and cannot move further. At this time, the volume of chamber A reaches its maximum value, and chamber A is filled with liquid medicine. The zero volume of chamber A before adding liquid medicine can ensure that the liquid medicine added to the syringe will not accumulate bubbles.

[0039] S12, adding power fluid: with the first exhaust port 14 facing upward, the displacement pump 4 injects part of the power fluid in the liquid storage bag 5 into the injection tube 1, so that the first tube section is filled with power fluid, and the first exhaust port 14 is closed.

[0040] In the factory-installed state of the liquid medicine supply device, the liquid reservoir bag 5 is already filled with power fluid, and the amount of power fluid is sufficient for step S12 and the subsequent step S13. In step S11, the first piston 21 moves to the stop structure 13 and then stops moving. Therefore, the gas in the syringe 1 is not completely discharged. The remaining gas is discharged in step 12. That is, as the power fluid is continuously injected, the power fluid gradually fills the chamber on the side of the first piston 21 away from the liquid outlet 42.

[0041] S13, pushing the medicine liquid: open the medicine outlet 12, and use the volume pump 4 to pump power liquid into the syringe 1, so that the first piston 21 moves toward the first end under the push of the power liquid, thereby pushing the medicine liquid in the syringe 1 into the infusion tube.

[0042] Since the chambers on both sides of the first piston 21 are filled with liquid medicine and power fluid, respectively, in step S13, the amount of power fluid pumped into the syringe 1 by the displacement pump 4 is equal to the amount of liquid medicine flowing out of the medicine outlet 12. Since the liquid medicine does not flow through the displacement pump 4, the agglomeration of substances such as active ingredients such as proteins and polypeptides in the liquid medicine during the suction and pumping process is avoided, which helps to ensure that the efficacy of the medicine is not affected. Moreover, even if the liquid medicine to be supplied is different, the displacement pump 4 still pumps the same power fluid, ensuring that the pumping accuracy of the displacement pump 4 is not affected.

[0043] Referring to Figure 2, Example 2 of the present application provides a liquid medicine supply device. The difference from Example 1 is that Example 2 also includes a second piston 22 arranged in the second pipe section, and the second piston 22 is located on the side of the first piston 21 close to the medicine outlet 12. Moreover, the second pipe section is provided with a closable second exhaust port 15, and the distance from the second exhaust port 15 to the limiting structure 13 matches the thickness of the first piston 21. That is, when the first piston 21 is against the limiting structure 13, the side of the first piston 21 away from the limiting structure 13 is aligned with the second exhaust port 15, so that the gas between the first piston 21 and the second piston 22 can be completely discharged from the second exhaust port 15.

[0044] Based on the liquid medicine supply device provided in Example 2, the present application provides a method for using the liquid medicine supply device, which includes the following steps:

[0045] S21, adding liquid medicine: when the medicine outlet 12 is closed and the second exhaust port 15 is opened, liquid medicine is injected into the injection tube 1 through the medicine adding port 11, so that the second piston 22 originally located at the first end moves toward the second end under the push of the medicine until the second piston 22 is in close contact with the first piston 21 originally located at the limiting structure 13, and the medicine adding port 11 and the second exhaust port 15 are closed.

[0046] The first piston 21 is originally located at the limiting structure 13, which means that in the factory state of the liquid medicine supply device, the first piston 21 stays between the second exhaust port 15 and the limiting structure 13 as shown in Figure 2. Therefore, in step S21 and the subsequent step S22, the volume of chamber C in Figure 2 does not change.

[0047] The second piston 22 is originally at the first end, which means that in the factory state of the liquid medicine supply device, the volume of chamber A in Figure 2 is zero. Therefore, as the liquid medicine is continuously injected, the volume of chamber A continues to increase, and the gas in chamber B is gradually discharged from the second exhaust port 15. The volume of chamber A is zero before the liquid medicine is added, which ensures that the liquid medicine added to the injection tube will not accumulate bubbles. When the second piston 22 moves to the position of the first piston 21, it is blocked and cannot move further. At this time, the volume of chamber A reaches its maximum value, and the volume of chamber B becomes zero, that is, the second piston 22 is in close contact with the first piston 21.

[0048] S22, adding power fluid: when the first exhaust port 14 is facing upward and open, the volumetric pump 4 injects part of the power fluid in the liquid storage bag 5 into the injection tube 1, so that the first tube section is filled with power fluid, and the first exhaust port 14 is closed.

[0049] In the factory-installed state of the liquid medicine supply device, the liquid reservoir bag 5 is already filled with power fluid, and the amount of power fluid is sufficient for step S22 and the subsequent step S23. Step S22 completely exhausts the gas within chamber C in FIG. 2 . That is, as power fluid is continuously injected, the gas within chamber C is exhausted from the first exhaust port 14 until chamber C is completely filled with power fluid.

[0050] S23, pushing the medicine liquid: open the medicine outlet 12, and use the volume pump 4 to pump power liquid into the syringe 1, so that the first piston 21 and the second piston 22 move toward the first end under the push of the power liquid, thereby pushing the medicine liquid in the syringe 1 into the infusion tube.

[0051] Since chamber B has disappeared, chamber A and chamber C are filled with medicine and power fluid respectively, so in step S23, the amount of power fluid pumped into the injection tube 1 by the volumetric pump 4 is equal to the amount of medicine flowing out of the medicine outlet 12.

[0052] In addition, in order to further simplify the use steps of the liquid medicine supply device, the step of adding power liquid can be completed in advance when manufacturing the liquid medicine supply device provided in Example 2, that is, in the factory state, the chamber C is already filled with power liquid. In this way, during subsequent use, only the above-mentioned two steps of adding liquid medicine and pushing liquid medicine need to be performed. As shown in Figure 2, the liquid storage bag 5 can be provided with a liquid filling port 51. In this way, when manufacturing the liquid medicine supply device, power liquid is continuously injected through the liquid filling port 51 to ensure that the liquid storage bag 5 is always in the maximum volume state. After the power liquid fills the chamber C, the first exhaust port 14 and the liquid filling port 51 are closed. It should be noted that in the above process, the air pressure in the chamber B should be sufficient to ensure that the first piston 21 does not move when the power liquid is added. Of course, in addition to utilizing the air pressure in chamber B to prevent the first piston 21 from moving during the above process, a limiting member that acts as a temporary stop can also be utilized to prevent the first piston 21 from moving during the above process. For example, FIG3 shows a liquid medicine supply device provided in Example 3 of the present application. The difference from Example 2 is that Example 3 further includes a temporary stop 16 provided on the second pipe section. The distance from the temporary stop 16 to the limiting structure 13 matches the thickness of the first piston 21, that is, the temporary stop 16 and the second exhaust port 15 are located at the same position in the axial direction of the syringe 1. Moreover, the temporary stop 16 has at least a first state and a second state. In the first state, the temporary stop 16 protrudes from the inner wall of the syringe 1, and in the second state, the temporary stop 16 does not protrude from the inner wall of the syringe 1. When manufacturing the liquid medicine supply device, the temporary stopper 16 is first switched to the first state so that the first piston 21 is stuck between the temporary stopper 16 and the limiting structure 13. In this way, the step of adding power fluid can be carried out to fill the chamber C with power fluid. After closing the first exhaust port 14, the temporary stopper 16 is switched to the second state. That is, in the factory state of the liquid medicine supply device, the temporary stopper 16 is withdrawn from the inner cavity of the injection tube 1 to avoid affecting the subsequent movement of the piston.

[0053] When the chamber C of the liquid medicine supply device is in a factory-delivered state and contains air, that is, the manufacturer has not added power fluid into the chamber C, the user of the liquid medicine supply device can also operate the temporary stopper 16 to complete the step of adding power fluid. For example, based on the liquid medicine supply device provided in Example 3, the present application provides a method for using the liquid medicine supply device, which includes the following steps:

[0054] S31, add power fluid: switch the temporary stopper 16 to the first state, jam the first piston 21 originally located at the limiting structure 13, and when the first exhaust port 14 is facing upward and open, the volumetric pump 4 injects part of the power fluid in the liquid storage bag 5 into the injection tube 1, so that the first tube section is filled with power fluid, and the first exhaust port 14 is closed.

[0055] The first piston 21 is originally located at the limiting structure 13, which means that in the factory state of the liquid medicine supply device, the first piston 21 stays between the second exhaust port 15 and the limiting structure 13 as shown in Figure 3. Therefore, in step S31 and the subsequent step S32, the volume of chamber C in Figure 3 does not change.

[0056] In the factory-installed state of the liquid medicine supply device, the liquid reservoir bag 5 is already filled with power fluid, and the amount of power fluid is sufficient for step S31 and the subsequent step S33. Step S31 completely exhausts the gas within chamber C in FIG3 . That is, as power fluid is continuously injected, the gas within chamber C is exhausted from the first exhaust port 14 until chamber C is completely filled with power fluid.

[0057] S32, adding liquid medicine: switch the temporary stopper 16 to the second state, and when the medicine outlet 12 is closed and the second exhaust port 15 is opened, inject liquid medicine into the injection tube 1 through the medicine adding port 11, so that the second piston 22 originally at the first end moves toward the second end under the push of the medicine until the second piston 22 is in close contact with the first piston 21, and the medicine adding port 11 and the second exhaust port 15 are closed.

[0058] Figure 3 shows the temporary stopper 16 in the first state. When the temporary stopper 16 switches to the second state, the temporary stopper 16 is retracted into the tube body of the syringe 1, so that the temporary stopper 16 does not protrude from the inner wall of the syringe 1. Therefore, the second piston 22 can move to a position in contact with the first piston 21, and the first piston 21 can move toward the drug outlet 12 in the subsequent step S33.

[0059] The second piston 22 is originally at the first end, which means that in the factory state of the liquid medicine supply device, the second piston 22 is located in the position shown in Figure 3, which ensures that the liquid medicine added to the injection tube will not accumulate bubbles. As the liquid medicine is continuously injected, the second piston 22 moves toward the first piston 21 under the push of the liquid medicine, and the volume of the chamber B formed between the second piston 22 and the first piston 21 continues to decrease, and the gas in the chamber B is discharged from the second exhaust port 15. When the second piston 22 moves to the position of the first piston 21, it is blocked and cannot move further. At this time, the chamber B between the second piston 22 and the first piston 21 disappears, that is, the second piston 22 is in close contact with the first piston 21.

[0060] S33, pushing the medicine liquid: open the medicine outlet 12, and use the volume pump 4 to pump power liquid into the syringe 1, so that the first piston 21 and the second piston 22 move toward the first end under the push of the power liquid, thereby pushing the medicine liquid in the syringe 1 into the infusion tube.

[0061] Since chamber B has disappeared, the second piston 22 is in close contact with the first piston 21, and the side of the second piston 22 away from the first piston 21 and the side of the first piston 21 away from the second piston 22 are respectively filled with medicine and power fluid. Therefore, in step S33, the amount of power fluid pumped into the injection tube 1 by the volumetric pump 4 is equal to the amount of medicine flowing out of the medicine outlet 12.

[0062] In practical applications, the power fluid can be hydraulic oil or pure water, and the displacement pump 4 can be a diaphragm pump. As shown in Figure 1, in this embodiment, the volume change driver 41 of the displacement pump 4 is provided with an elastically deformable diaphragm. Specifically, the diaphragm deformation can be driven by methods such as the inverse piezoelectric effect. Each time the diaphragm pump receives a control signal, it pumps a fixed volume of liquid. To improve control accuracy, the liquid inlet 43 and liquid outlet 42 of the displacement pump 4 are generally provided with one-way valves.

[0063] In a preferred embodiment, the liquid medicine supply device includes a controller electrically connected to the positive displacement pump 4, and the controller is equipped with a timing module, which facilitates pumping of the power fluid at predetermined intervals. To facilitate understanding the current status of the liquid medicine supply device, a pressure sensor 3 can be provided within the first pipe section, and the pressure value detected by the pressure sensor 3 can be used to determine whether the operating pressure is normal. Furthermore, if the liquid medicine supply device provided in Example 2 is pre-filled with power fluid at the factory, i.e., if the power fluid pre-fills the first pipe section, the pressure value detected by the pressure sensor 3 can also be used during the liquid medicine addition step to determine whether the liquid medicine is fully filled, i.e., whether the second piston 22 is in contact with the first piston 21.

[0064] In a preferred embodiment, a sealing member is provided at the first exhaust port 14 for sealing the first exhaust port 14. The sealing member is made of a material that absorbs the power fluid and swells, thereby achieving automatic sealing of the first exhaust port 14. It should be noted that the swelling material used in this application is a known material. The limiting structure 13 can be configured in a variety of ways. For example, the limiting structure 13 can be configured as a ring rib on the inner wall of the injection tube 1, or as a plurality of circumferentially distributed protrusions on the inner wall of the injection tube 1.

[0065] To close and open the drug outlet 12, an on-off valve can be provided at the drug outlet 12. Specifically, the on-off valve can be an electrically controlled valve. Alternatively, the drug outlet 12 can be closed and opened using a manually controlled liquid stop clamp. For example, the drug outlet 12 can be connected to a hose, with a liquid stop clamp provided at the end of the hose near the liquid outlet 42, and a connector for connecting to an infusion tube provided at the end of the hose away from the liquid outlet 42. Of course, if the drug outlet 12 is connected to a hose, an electrically controlled liquid stop can also be provided at the end of the hose near the liquid outlet 42 to enable software-controlled closing and opening of the drug outlet 12.

[0066] In this specification, the structure of each part is described in a progressive manner, and the structure of each part focuses on the differences from the existing structure. The overall and partial structures of the liquid medicine supply device can be obtained by combining the structures of the above multiple parts.

[0067] The above description of the disclosed embodiments will enable those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A liquid medicine supply device, characterized in that: include: The injection tube has a first end and a second end opposite to each other, the first end is provided with a drug addition port and a drug outlet for connecting to an infusion tube, a position of the injection tube near the second end is provided with a limiting structure for stopping a piston, and a first tube section between the limiting structure and the second end is provided with a closable first exhaust port; A first piston is disposed in the second pipe section between the limiting structure and the first end; A fluid storage bag, used to store power fluid; A volumetric pump, wherein the liquid inlet of the volumetric pump is connected to the liquid storage bag via a pipeline, and the liquid outlet of the volumetric pump is connected to the first pipe section via a pipeline.

2. The liquid medicine supply device according to claim 1, characterized in that: Also included is a pressure sensor disposed in the first pipe section.

3. The liquid medicine supply device according to claim 1, characterized in that: The volumetric pump is a diaphragm pump.

4. The liquid medicine supply device according to claim 1, characterized in that: A controller is included which is electrically connected to the displacement pump, and the controller is provided with a timing module.

5. The drug solution supply device according to claim 1, characterized in that: A sealing member for closing the first exhaust port is provided at the first exhaust port, and the sealing member is made of a material that can absorb the power fluid and swell.

6. The liquid medicine supply device according to claim 1, characterized in that: The medicine outlet is connected to a hose, an end of the hose close to the liquid outlet is provided with an electrically controlled liquid stopper or a manually controlled liquid stop clamp, and an end of the hose away from the liquid outlet is provided with a connector for connecting an infusion tube.

7. The drug solution supply device according to any one of claims 1 to 6, characterized in that: It also includes a second piston arranged in the second pipe section, the second piston is located on the side of the first piston close to the medicine outlet, the second pipe section is provided with a closable second exhaust port, and the distance from the second exhaust port to the limiting structure matches the thickness of the first piston.

8. The liquid medicine supply device according to claim 7, characterized in that: It also includes a temporary stopper disposed on the second pipe section, wherein the distance between the temporary stopper and the limiting structure matches the thickness of the first piston; The temporary stopper has at least a first state and a second state. In the first state, the temporary stopper protrudes from the inner wall of the injection tube. In the second state, the temporary stopper does not protrude from the inner wall of the injection tube.

9. A method for using a liquid medicine supply device, characterized in that: The liquid medicine supply device is a liquid medicine supply device as claimed in any one of claims 1 to 6, and the method of use comprises: Step A, adding liquid medicine: in a state where the medicine outlet is closed and the first exhaust port is opened, liquid medicine is injected into the injection tube through the medicine adding port, so that the first piston originally located at the first end moves to the position of the limiting structure under the push of the liquid medicine, and the medicine adding port is closed; Step B, adding power fluid: in a state where the first exhaust port is facing upward, the volumetric pump injects part of the power fluid in the liquid storage bag into the injection tube, so that the first tube section is filled with power fluid, and the first exhaust port is closed; Step C, pushing the medicine liquid: opening the medicine outlet, and having the volumetric pump pump power liquid into the injection tube, so that the first piston moves toward the first end under the push of the power liquid, thereby pushing the medicine liquid in the injection tube into the infusion tube.

10. A method for using a liquid medicine supply device, characterized in that: The liquid medicine supply device is the liquid medicine supply device according to claim 8, and the method of use comprises: Step A, adding power fluid: switching the temporary stopper to the first state, clamping the first piston originally located at the limit structure, and in the state where the first exhaust port is facing upward and open, injecting part of the power fluid in the liquid storage bag into the injection tube by the volume pump, so that the first tube section is filled with power fluid, and closing the first exhaust port; Step B, adding liquid medicine: switching the temporary stopper to the second state, in the state where the medicine outlet is closed and the second exhaust port is opened, injecting liquid medicine into the injection tube through the medicine adding port, so that the second piston originally at the first end moves toward the second end under the push of the liquid medicine until the second piston is in close contact with the first piston, and the medicine adding port and the second exhaust port are closed; Step C, pushing the medicine liquid: opening the medicine outlet, and having the volumetric pump pump power fluid into the injection tube, so that the first piston and the second piston move toward the first end under the push of the power fluid, thereby pushing the medicine liquid in the injection tube into the infusion tube.

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