Liquid medicine supply device and use method thereof

Abstract

The invention discloses a liquid medicine supply device and a using method thereof. The liquid medicine supply device comprises an injection tube, a first piston, 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, the first end is provided with a medicine adding port and a medicine outlet used for being connected with an infusion tube, a limiting structure used for stopping the piston is arranged at the position, close to the second end, in the injection tube, and a first tube section between the limiting structure and the second end is provided with a first exhaust port capable of being closed. The first piston is arranged in the second pipe section between the limiting structure and the first end, the liquid storage bag is used for storing power liquid, a liquid inlet of the displacement pump is connected with the liquid storage bag through a pipeline, and a liquid outlet of the displacement pump is connected with the first pipe section through a pipeline. The liquid medicine supply device is simple in structure, the production and manufacturing cost is reduced, substances in the liquid medicine can be prevented from being agglomerated when the liquid medicine is conveyed, the influence of the conveying process on the medicine effect is reduced, and in addition, the control precision of the medicine amount can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a liquid medicine supply device and a method of using the same. Background Art

[0002] 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 volumetric 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 volumetric pump and undergoes a process of suction and pumping. This process often causes the 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 volumetric 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 solved urgently by those skilled in the art. Summary of the invention

[0003] On the one hand, this application provides the following technical solutions:

[0004] A liquid medicine supply device, comprising:

[0005] 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 port 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;

[0006] A first piston is disposed in the second pipe section between the limiting structure and the first end;

[0007] A fluid storage bag, used to store power fluid;

[0008] 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.

[0009] Optionally, the above-mentioned liquid medicine supply device further includes a pressure sensor arranged in the first pipe section.

[0010] Optionally, in the above-mentioned liquid medicine supply device, the volume pump is a diaphragm pump.

[0011] Optionally, in the above-mentioned liquid medicine supply device, the limiting structure is a ring rib arranged on the inner wall of the injection tube.

[0012] 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.

[0013] 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.

[0014] Optionally, in the above-mentioned medicine liquid supply device, 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 stop device 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.

[0015] Optionally, the above-mentioned medicine liquid supply device further includes a second piston arranged in the second pipe segment, the second piston is located on the side of the first piston close to the medicine outlet, the second pipe segment 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.

[0016] Optionally, the above-mentioned liquid medicine supply device further includes a temporary stopper arranged on the second pipe segment, 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.

[0017] A method for using the above-mentioned liquid medicine supply device, the method comprising:

[0018] 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;

[0019] 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;

[0020] 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.

[0021] A method for using the above-mentioned liquid medicine supply device, the method comprising:

[0022] 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;

[0023] 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;

[0024] 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.

[0025] The liquid medicine supply device provided in this application has the following beneficial effects:

[0026] After the volumetric pump pumps the power fluid in the liquid storage bag into the syringe, the power fluid is used 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 medicine delivery, 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 beneficial to improve the control accuracy of the medicine amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 is a schematic diagram of a liquid medicine supply device provided in Example 1 of the present application;

[0029] Figure 2 is a schematic diagram of a liquid medicine supply device provided in Example 2 of the present application;

[0030] Figure 3 It is a schematic diagram of the liquid medicine supply device provided in Example 3 of the present application.

[0031] The markings in the figure are:

[0032] 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. Volumetric pump; 41. Volume change driver; 42. Liquid outlet; 43. Liquid inlet; 5. Liquid storage bag; 51. Dosing port. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] See also Figure 1 , Embodiment 1 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 volume pump 4, wherein the syringe 1 has a first end and a second end opposite 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 a position near the second end inside the syringe 1 is provided with a limiting structure 13 for stopping the piston. A first closable exhaust port 14 is provided in the first pipe section between the limiting structure 13 and the second end, 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 volume pump 4 is connected to the liquid storage bag 5 through a pipeline, and the liquid outlet 42 of the volume pump 4 is connected to the first pipe section through a pipeline.

[0035] 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 comprises the following steps:

[0036] S11, adding liquid medicine: when the drug outlet 12 is closed and the first exhaust port 14 is opened, liquid medicine is injected into the injection tube 1 through the drug 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 liquid medicine, and the drug adding port 11 is closed.

[0037] The first piston 21 is originally at the first end, which means that in the factory state of the liquid medicine supply device, Figure 1The volume of chamber A in the injection tube is zero, so 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, the first piston 21 cannot continue to move due to the blocking effect of the limiting structure 13. At this time, the volume of chamber A reaches the maximum value, and chamber A is filled with liquid medicine. The volume of chamber A is zero before adding liquid medicine, which can ensure that the liquid medicine added to the injection tube will not accumulate bubbles.

[0038] S12, adding power fluid: when the first exhaust port 14 is facing upward, 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.

[0039] In the factory state of the liquid medicine supply device, the liquid storage bag 5 is already filled with power liquid, and the amount of power liquid is sufficient for step S12 and the subsequent step S13. In the aforementioned step S11, the first piston 21 moves to the limiting structure 13 and then stops moving, so the gas in the injection tube 1 is not completely discharged, and the remaining gas is discharged through step 12, that is, as the power liquid is continuously injected, the power liquid gradually fills the chamber on the side of the first piston 21 away from the liquid outlet 42.

[0040] S13, pushing the medicine liquid: opening the medicine outlet 12, and pumping the power liquid to the syringe 1 by the volume pump 4, 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 to the infusion tube.

[0041] Since the chambers on both sides of the first piston 21 are filled with the medicine liquid and the power liquid respectively, in step S13, the amount of power liquid pumped into the syringe 1 by the displacement pump 4 is equal to the amount of medicine liquid flowing out of the medicine outlet 12. Since the medicine liquid does not flow through the displacement pump 4, the agglomeration of substances such as active ingredient proteins and polypeptides in the medicine liquid due to the suction and pumping process is avoided, which is conducive to ensuring that the efficacy of the medicine is not affected. Moreover, even if the medicine liquids to be supplied are different, the displacement pump 4 still pumps the same power liquid, ensuring that the pumping accuracy of the displacement pump 4 is not affected.

[0042] See also Figure 2 Embodiment 2 of the present application provides a liquid medicine supply device, which differs from Embodiment 1 in that Embodiment 2 further includes a second piston 22 disposed in a second pipe segment, and the second piston 22 is located on a side of the first piston 21 close to the medicine outlet 12, and the second pipe segment 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 abuts against the limiting structure 13, a 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.

[0043] Based on the liquid medicine supply device provided in the second embodiment, the present application provides a method for using the liquid medicine supply device, which comprises the following steps:

[0044] S21, adding liquid medicine: when the drug outlet 12 is closed and the second exhaust port 15 is opened, liquid medicine is injected into the injection tube 1 through the drug 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 liquid medicine until the second piston 22 is in close contact with the first piston 21 originally located at the limiting structure 13, and the drug adding port 11 and the second exhaust port 15 are closed.

[0045] 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 is Figure 2 As shown, it stays between the second exhaust port 15 and the limiting structure 13, so in step S21 and the subsequent step S22, Figure 2 The volume of chamber C does not change.

[0046] The second piston 22 is originally at the first end, which means that in the factory state of the liquid medicine supply device, Figure 2 The volume of chamber A in the injection tube 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 can ensure 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 the 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.

[0047] 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.

[0048] In the factory state of the liquid supply device, the liquid storage bag 5 is already filled with power liquid, and the amount of power liquid is sufficient for step S22 and the subsequent step S23. Figure 2 The gas in the chamber C is completely discharged, that is, as the power fluid is continuously injected, the gas in the chamber C is discharged from the first exhaust port 14 until the power fluid fills the chamber C.

[0049] S23, pushing the medicine liquid: opening the medicine outlet 12, and pumping the power liquid to the syringe 1 by the volume pump 4, 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 to the infusion tube.

[0050] 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.

[0051] In addition, in order to further simplify the steps of using 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 the second embodiment, that is, in the factory state, the chamber C is already filled with power liquid. In this way, in the subsequent use process, only the above-mentioned steps of adding liquid medicine and pushing liquid medicine are required. Figure 2 As shown, 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 fluid is continuously injected through the liquid filling port 51 to ensure that the liquid storage bag 5 is always in a maximum volume state. After the power fluid 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 chamber B should be sufficient to ensure that the first piston 21 does not move when the power fluid 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 limit member that acts as a temporary stop can also be used to prevent the first piston 21 from moving during the above process. For example, Figure 3 A liquid medicine supply device provided by Example 3 of the present application is shown. The difference from Example 2 is that Example 3 also includes a temporary stopper 16 arranged on the second pipe section, and the distance from the temporary stopper 16 to the limiting structure 13 matches the thickness of the first piston 21, that is, the temporary stopper 16 and the second exhaust port 15 are located at the same position in the axial direction of the injection tube 1, and the temporary stopper 16 has at least a first state and a second state. In the first state, the temporary stopper 16 protrudes from the inner wall of the injection tube 1, and in the second state, the temporary stopper 16 does not protrude from the inner wall of the injection tube 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, so that the step of adding power fluid can be carried out to fill the chamber C with the power fluid, and then the temporary stopper 16 is switched to the second state after the first exhaust port 14 is closed. 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.

[0052] When the chamber C of the liquid medicine supply device is in the factory state and there is 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 the third embodiment, the present application provides a method for using the liquid medicine supply device, and the method includes the following steps:

[0053] S31, adding 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, inject part of the power fluid in the liquid storage bag 5 into the injection tube 1 by the volume pump 4, so that the first tube section is filled with power fluid, and the first exhaust port 14 is closed.

[0054] 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 is Figure 3 As shown, it stays between the second exhaust port 15 and the limiting structure 13, so in step S31 and the subsequent step S32, Figure 3 The volume of chamber C does not change.

[0055] In the factory state of the liquid supply device, the liquid storage bag 5 is already filled with power liquid, and the amount of power liquid is sufficient for step S31 and the subsequent step S33. Figure 3 The gas in the chamber C is completely discharged, that is, as the power fluid is continuously injected, the gas in the chamber C is discharged from the first exhaust port 14 until the power fluid fills the chamber C.

[0056] S32, adding drug liquid: switch the temporary stopper 16 to the second state, and when the drug outlet 12 is closed and the second exhaust port 15 is opened, inject drug liquid into the injection tube 1 through the drug adding port 11, so that the second piston 22 originally at the first end moves toward the second end under the push of the drug liquid until the second piston 22 is in close contact with the first piston 21, and the drug adding port 11 and the second exhaust port 15 are closed.

[0057] Figure 3 What is shown is 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 injection tube 1 so that the temporary stopper 16 does not protrude from the inner wall of the injection tube 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.

[0058] 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 at Figure 3 The position shown in the figure can ensure 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 is continuously reduced, 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.

[0059] S33, pushing the medicine liquid: opening the medicine outlet 12, and pumping the power liquid to the syringe 1 by the volume pump 4, 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 to the infusion tube.

[0060] 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.

[0061] In specific practical applications, the power fluid may be hydraulic oil or pure water, and the displacement pump 4 may be a diaphragm pump. Figure 1 As shown, in this embodiment, a diaphragm capable of elastic deformation is provided in the volume change driver 41 of the displacement pump 4, and the deformation of the diaphragm can be driven by the inverse piezoelectric effect or the like, and the diaphragm pump pumps out a fixed volume of liquid each time it receives a control signal. In order to improve the control accuracy, a one-way valve is generally provided at the liquid inlet 43 and the liquid outlet 42 of the displacement pump 4.

[0062] In a preferred embodiment, the liquid medicine supply device includes a controller electrically connected to the displacement pump 4, and the controller is provided with a timing module, so that it is convenient to pump the power liquid at a predetermined interval. In order to facilitate understanding of the current state of the liquid medicine supply device, a pressure sensor 3 can be provided in the first pipe section, and whether the working pressure is normal can be judged according to the pressure value detected by the pressure sensor 3. Moreover, in the case where the liquid medicine supply device provided in the second embodiment is pre-filled with power liquid before leaving the factory, that is, the power liquid pre-fills the first pipe section, it can also be judged in the liquid medicine adding step whether the liquid medicine has been filled, that is, whether the second piston 22 has been in contact with the first piston 21 according to the pressure value detected by the pressure sensor 3.

[0063] In a preferred embodiment, a sealing member for closing the first exhaust port 14 is provided at the first exhaust port 14, and the sealing member is made of a material that can absorb power fluid and swell, so that the first exhaust port 14 can be automatically closed. It should be noted that the swelling material used in this application is a known material. There are many options for the form of the limiting structure 13. For example, the limiting structure 13 can be set as a ring rib on the inner wall of the injection tube 1, or as a plurality of bosses distributed circumferentially on the inner wall of the injection tube 1.

[0064] In order to realize the closing and opening of the medicine outlet 12, a switch valve can be provided at the medicine outlet 12, and the switch valve can be specifically an electrically controlled valve. In addition, the closing and opening of the medicine outlet 12 can also be realized by a manually controlled liquid stop clamp, for example, the medicine outlet 12 is connected to a hose, and a liquid stop clamp is provided at one end of the hose close to the liquid outlet 42, and a connector for connecting an infusion tube is provided at one end of the hose away from the liquid outlet 42. Of course, in the case where the medicine outlet 12 is connected to a hose, an electrically controlled liquid stop can also be provided at one end of the hose close to the liquid outlet 42, so as to control the closing and opening of the medicine outlet 12 by software.

[0065] In this specification, each part of the structure 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-mentioned multiple parts.

[0066] The above description of the disclosed embodiments enables 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 will not be limited to the embodiments shown herein, but will conform to the widest scope 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 port 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.

Images