Hydraulic infusion device and hydraulic infusion method

Abstract

The invention belongs to the field of medical instruments, and relates to a hydraulic infusion device and a hydraulic infusion method. The problem of how to improve the sealing performance after exhaust is solved. Provided is a hydraulic infusion device, comprising: a driving liquid storage container for storing a driving liquid; the medicine storage device comprises a piston, a medicine storage cavity formed in the front side of the piston and a driving cavity formed in the rear side of the piston, the piston can slide in the medicine storage device so as to change the sizes of the medicine storage cavity and the driving cavity, and the driving cavity is provided with an exhaust port; the positive displacement pump is provided with a liquid inlet and a liquid outlet, the liquid inlet is used for being connected with the driving liquid storage container, and the liquid outlet is used for being connected with the driving cavity; and the exhaust assembly is used for exhausting gas in the positive displacement pump and the driving cavity and comprises an exhaust flow channel, the cross section of the exhaust flow channel is provided with a waterproof breathable film which is breathable but not permeable to liquid, and the exhaust flow channel and the driving cavity have a communicating state and a closing state. The invention further provides a hydraulic liquid conveying method, communication between the driving cavity and the outside is closed after exhausting is completed, and therefore the sealing performance is improved.

Description

Technical Field

[0001] The invention belongs to the field of medical equipment and relates to a hydraulic infusion device and a hydraulic infusion method. Background Art

[0002] In many scenarios, a liquid medicine supply device is needed, 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. However, the liquid medicine passes through a volumetric pump and undergoes a process of suction and pumping out. This process often causes the 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. Therefore, Chinese patents such as "CN118320221A", "CN118416336A", and "CN118697979A" do not allow the liquid medicine to pass through a volumetric pump, but use a volumetric pump to pump the driving liquid to drive the piston in the medicine reservoir, so that the piston pushes the liquid medicine to output.

[0003] Before pumping the liquid medicine, the volumetric pump is not pre-filled with liquid, so the residual gas needs to be discharged. For example, the above-mentioned Chinese patent document "CN118697979A" is a gas discharge solution, but if the discharge structure of this solution is not well sealed, it may cause liquid leakage. Summary of the invention

[0004] The purpose of the present invention is to provide a hydraulic infusion device, which solves the problem of how to improve the sealing performance after exhaust.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a hydraulic infusion device, comprising: A driving liquid storage container, used for storing the driving liquid; A medicine reservoir, the medicine reservoir comprising a piston, a medicine storage cavity arranged in front of the piston, and a driving cavity arranged in the rear of the piston, the piston being able to slide in the medicine reservoir to change the sizes of the medicine storage cavity and the driving cavity, and the driving cavity being provided with an exhaust port; A displacement pump, the displacement pump having a liquid inlet and a liquid outlet, the liquid inlet being used to be connected to the drive liquid storage container, and the liquid outlet being used to be connected to the drive chamber; An exhaust component is used to exhaust the gas in the volume pump and the drive chamber. The exhaust component includes a discharge channel. A waterproof and breathable membrane that is breathable but not liquid-permeable is provided on the cross section of the discharge channel. The discharge channel and the drive chamber have two states: connected and closed.

[0006] Preferably, the exhaust component includes a plug I and a pull-out plug, the plug I is arranged at the exhaust port, the pull-out plug is provided with the exhaust channel, the pull-out plug is provided with a hollow puncture needle I for piercing the plug I, and when the puncture needle I pierces the plug I, the driving chamber is connected with the exhaust channel.

[0007] Furthermore, the extraction plug comprises a first part and a second part, the puncture needle I is embedded in the first part, the waterproof breathable membrane is embedded between the first part and the second part, and a pressure sensor is arranged in the volume pump.

[0008] Preferably, a connection switch is also included, which includes a slider, the slider has an inner cavity, the inner cavity is connected to the drive liquid storage container, the slider is provided with a plug II, the inner surface of the plug II is connected to the inner cavity, the liquid inlet of the volumetric pump is provided with a hollow puncture needle II, the slider is slidably arranged and can use sliding to make the puncture needle II pierce the plug II to connect the inner cavity with the volumetric pump.

[0009] Furthermore, a trigger mechanism is provided on the connection switch, and the trigger mechanism is triggered when the puncture needle II pierces the obstruction II, and the volume pump is started when the trigger mechanism is triggered.

[0010] Furthermore, the trigger mechanism includes a first conductive sheet and a second conductive sheet, the second conductive sheet is connected to the slider, the first conductive sheet is stationary, and when the puncture needle II pierces the blockage II, the first conductive sheet and the second conductive sheet are in contact and electrically connected.

[0011] Preferably, the driving liquid storage container is a liquid bag formed by hot pressing of a composite flexible film material, and is elastically expanded after being filled with a fixed volume of driving liquid.

[0012] Preferably, the medicine storage device is also provided with a movable puncture needle III, the puncture needle III is communicated with the medicine storage cavity, and the puncture needle III is connected to a shifting block.

[0013] Preferably, an isolation layer is provided between the drive liquid storage container and the displacement pump and / or between the drive liquid storage container and the electrical part.

[0014] Preferably, the medicine storage cavity is connected to a medicine adding channel, the front end of the medicine storage cavity has a pointed top, the pointed top is connected to a flared exhaust and infusion channel and the flared end is close to the pointed top.

[0015] A hydraulic infusion method is also provided, which uses a volumetric pump to pump the driving liquid in the driving liquid storage container to the medicine storage container, so that the driving liquid drives the piston in the medicine storage container to move to discharge the medicine liquid in front of the piston, and performs an exhaust step before the medicine liquid discharge operation, and uses the exhaust step to exhaust the gas in the driving cavity of the driving liquid storage container, the volumetric pump and the medicine storage container. The exhaust step includes using an exhaust component to connect the driving cavity with the outside world in a gas-permeable and liquid-impermeable manner, and after the exhaust is completed, the exhaust component is removed and the connection between the driving cavity and the outside world is closed by plugging.

[0016] Preferably, the exhaust step further comprises monitoring the pressure of the drive chamber and issuing a reminder when the pressure reaches a set critical value.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The hydraulic infusion device of the present invention connects the discharge flow channel with the driving chamber when exhaust is required, and the gas is discharged through the waterproof breathable membrane, while the liquid cannot pass through the waterproof breathable membrane and is blocked, and then the discharge flow channel and the driving chamber are closed, and the driving chamber is not connected with the outside, so that the driving chamber is sealed, so that the driving liquid is not easy to leak when the medicine is delivered. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention; Figure 2 yes Figure 1 AA section view; Figure 3 yes Figure 2 The enlarged view of point B; Figure 4 yes Figure 2 Enlarged view of point C; Figure 5 yes Figure 2 Another state diagram of ; Figure 6 yes Figure 5 Enlarged view of point D in the middle; Figure 7 yes Figure 1 EE cross-sectional view; Figure 8 yes Figure 7 The enlarged view of point F; Fig. 9 yes Figure 1 GG cross-sectional view; Fig.10is a schematic diagram of the exhaust assembly structure of Example 2; Fig.11 is a schematic diagram of the connectivity switch structure of Example 3; Fig.12 is a schematic structural diagram of Example 4; Fig.13 yes Fig.12 HH cross-sectional view; Fig.14 is a cross-sectional view of Example 5, corresponding to Fig.13 ; Fig.15 is a cross-sectional view of Example 6, showing the drug storage device for adding drugs; The reference numerals are described as follows: 1. Drive liquid storage container; 2. Drug storage device; 21. Piston; 22. Drug storage chamber; 23. Drive chamber; 24. Exhaust port; 25. Needle III; 26. Push block; 27. Spring; 28. Dosing channel; 281. Dosing port; 29. ​​Exhaust and infusion channel; 3. Volumetric pump; 31. Needle II; 4. Exhaust assembly; 41. Exhaust channel; 42. Waterproof breathable membrane; 43. Plug I; 44. Pull-out plug; 441. First part; 442. Second part; 45. Needle I; 46. Valve; 5. Connecting switch; 51. Slider; 511. Inner cavity; 52. Plug II; 53. Trigger mechanism; 531. First conductive sheet; 532. Second conductive sheet; 533. Magnet; 534. Reed switch; 6. Battery; 7. Circuit board; 8. Isolation layer. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 like Figure 1 The hydraulic infusion device shown in the figure includes a driving liquid storage container 1, a drug storage container 2, a volumetric pump 3 (also called a volumetric micropump), a battery 6, and a circuit board 7 (see Fig. 9 ), connecting switch 5 and exhaust component 4.

[0021] Wherein, the circuit board 7 is arranged on the back side (see Fig. 9 ), powered by a battery 6. The displacement pump 3 is powered by a circuit board 7 and receives instructions from the circuit board 7, such as start and stop instructions. The drive liquid storage container 1 is used to store the drive liquid. A piston 21 is provided in the drug storage container 2. The front side of the piston 21 ( Figure 1The medicine storage chamber 22 is used to store the medicine to be injected into the human body, such as insulin. Figure 1 The driving chamber 23 is used to store the driving liquid. The displacement pump 3 has a liquid inlet and a liquid outlet. The liquid inlet of the displacement pump 3 draws the driving liquid in the driving liquid storage container 1, pumps it into the driving chamber 23 from the liquid outlet, and uses the driving liquid to drive the piston 21 downward to discharge the liquid in the medicine storage chamber 22 (from the liquid in the medicine storage chamber 22). Figure 8 The needle III 25 shown is discharged).

[0022] Figure 1 The connection switch 5 is used to switch the driving liquid storage container 1 and the displacement pump 3 from a disconnected state to a connected state. Figure 1 The exhaust assembly 4 is used to exhaust the gas in the volume pump 3 and the drive chamber 23.

[0023] When the device is started, the displacement pump 3 and the drive chamber 23 are not filled with liquid in advance, so they need to be filled with drive liquid. During the filling process, the gas needs to be discharged, otherwise it will affect the subsequent liquid pumping accuracy. In this example, the exhaust component 4 is used for exhaust.

[0024] like Figure 2 and Figure 3 As shown, the exhaust component 4 includes a discharge channel 41, a waterproof and breathable membrane 42, a plug I 43, a pull-out plug 44 and a puncture needle I 45.

[0025] The driving chamber 23 has an exhaust port 24 for exhausting air. A plug 143 is arranged at the exhaust port 24 to prevent the exhaust port 24 from being connected to the outside. The plug 143 is made of rubber.

[0026] The extraction plug 44 is provided with a discharge flow channel 41 and a puncture needle Ⅰ45. The puncture needle Ⅰ45 is hollow and communicates with the discharge flow channel 41. The puncture needle Ⅰ45 can pierce the blockage Ⅰ43. When the blockage Ⅰ43 is pierced, the drive chamber 23 is communicated with the inside of the puncture needle Ⅰ45, and then communicated with the discharge flow channel 41. The discharge flow channel 41 is connected to the outside world, and the gas in the drive chamber 23 can be discharged at this time.

[0027] A waterproof breathable membrane 42 is provided inside the extraction plug 44, and the waterproof breathable membrane 42 is intercepted on the cross section of the discharge flow channel 41. The waterproof breathable membrane 42 allows gas to pass through, but can intercept liquid so that the liquid cannot pass through. In this way, after the gas is exhausted, the driving liquid cannot flow out.

[0028] The extraction plug 44 includes a first part 441 and a second part 442, which is for easy assembly. The puncture needle I 45 is arranged on the first part 441, the waterproof breathable membrane 42 is sandwiched between the first part 441 and the second part 442, and the second part 442 is embedded in the outer end of the first part 441. The first part 441 and the second part 442 are separated before assembly, and can be made inseparable after assembly by gluing or other methods.

[0029] like Figure 5 As shown, when the gas is exhausted, the plug 44 can be pulled out. At this time, the puncture needle Ⅰ45 is separated from the plug Ⅰ43, and the plug Ⅰ43 closes the puncture hole left by the puncture needle Ⅰ45 due to its own elasticity, closes the connection with the outside world, and seals the drive chamber 23. Due to the sealing effect of the plug Ⅰ43, it is not easy to leak the driving liquid during the process of pumping the liquid medicine.

[0030] A pressure sensor (not shown) is also provided in the displacement pump 3 to monitor the pressure of the driving chamber 23. The gas is first discharged from the exhaust assembly 4 to the outside atmosphere, and the subsequent liquid is blocked inside by the waterproof and breathable membrane 42. As the displacement pump 3 continues to pump, the pressure in the driving chamber 23 in the drug storage device continues to increase until it increases to a critical value. The pressure sensor detects that the pressure value in the driving chamber 23 reaches the critical value, and uses the circuit board 7 to stop the displacement pump 3 and remind the user to manually remove the extraction plug 44. At this time, the exhaust passage is blocked by the blockage Ⅰ43.

[0031] like Figure 2 and Figure 4 As shown, the connection switch 5 is used to start the displacement pump 3, and is also used to connect the drive liquid storage container 1 and the displacement pump 3, and only one pressing action is required to simultaneously realize the aforementioned two functions, which is more convenient to operate.

[0032] The connection switch 5 includes a slider 51, and an inner cavity 511 is arranged in the slider 51. The inner cavity 511 is connected to the driving liquid storage container 1 through a hose. A plug II 52 is arranged at the left end of the inner cavity 511. The right side of the plug II 52 directly contacts the inner cavity 511.

[0033] The slider 51 can slide to the left, and the right end of the slider 51 has a portion exposed on the right side surface of the device, which is convenient for manual pressing. The liquid inlet of the volumetric pump 3 is provided with a puncture needle II 31, which is hollow. When the slider 51 slides to the left, the puncture needle II 31 pierces the blocking II 52, so that the inner cavity 511 is connected with the puncture needle II 31, and then the driving liquid storage container 1 is connected with the volumetric pump 3. Figure 5 and Figure 6 Status shown.

[0034] The connection switch 5 also includes a trigger mechanism 53. The trigger mechanism 53 includes a first conductive sheet 531 and a second conductive sheet 532. The first conductive sheet 531 is disposed on the device housing and is stationary and fixed to the circuit board 7. The second conductive sheet 532 is connected to the slider 51. When the slider 51 slides to the left, the first conductive sheet 531 and the second conductive sheet 532 come into contact to achieve electrical conduction. Figure 5 and Figure 6 The first conductive sheet 531 and the second conductive sheet 532 are connected to the displacement pump 3 and the circuit board 7 accordingly, so that when the first conductive sheet 531 and the second conductive sheet 532 are electrically connected, the displacement pump 3 is powered on and works.

[0035] Therefore, when the slider 51 is pushed to move leftward, the puncture needle II 31 pierces the blocking II 52, so that the driving liquid storage container 1 and the displacement pump 3 are connected, the displacement pump 3 is also started. One action can achieve two functions.

[0036] The relative isolation between the driving liquid storage container 1 and the displacement pump 3 before use can prevent the air in the displacement pump 3 from mixing into the driving liquid storage container 1; and can prevent the driving liquid in the driving liquid storage container 1 from flowing into the displacement pump 3, thereby avoiding damage to the displacement pump 3 due to thermal expansion and contraction of the liquid in a low-temperature environment.

[0037] like Figure 7 and Figure 8 As shown, the liquid outlet of the drug reservoir 2 is provided with a puncture needle III 25, which is connected to a shift block 26. By pressing the shift block 26 to the left, the liquid outlet end of the puncture needle III 25 can be extended out of the housing for puncturing into a human body, such as the abdomen of a human body to inject insulin. A spring 27 is also provided between the shift block 26 and the housing to reset the shift block 26.

[0038] In this example, the driving liquid storage container 1 is a liquid bag made of composite flexible film material by hot pressing, and is elastically stretched after being filled with a fixed volume of driving liquid. After filling with a fixed volume of liquid, it can naturally provide positive pressure for the liquid inlet of the volumetric pump 3, making the pumping process easier and more accurate, and the residual volume is small after the pumping is completed. The problem of excessive liquid residue in the blow-molded liquid bag is effectively reduced. In addition, modern technology is mature, and the customization and production costs are low.

[0039] As can be seen from the above, this example also provides a hydraulic infusion method, using a displacement pump 3 to pump the driving liquid in the driving liquid storage container 1 to the medicine reservoir 2, so that the driving liquid drives the piston 21 in the medicine reservoir 2 to move so that the liquid medicine in front of the piston 21 is discharged, and an exhaust step is performed before the liquid medicine discharge operation, and the gas in the driving chamber 23 of the driving liquid storage container 1, the displacement pump 3 and the medicine reservoir 2 is discharged by the exhaust step, and the exhaust step includes making the driving chamber 23 and the outside world connected in a gas-permeable and liquid-impermeable manner, and closing the connection between the driving chamber 23 and the outside world after the exhaust is completed. The exhaust step also includes monitoring the pressure of the driving chamber 23, and issuing a reminder when the pressure reaches a set critical value.

[0040] Example 2 like Fig.10 The exhaust assembly 4 shown is different from the embodiment 1 in that the switching between the connected and closed states between the exhaust flow channel 41 and the drive chamber 23 is achieved by a valve 46, which is a valve commonly used in the on-off control of fluid pipelines.

[0041] Example 3 like Fig.11 The connection switch 5 shown is different from the embodiment 1 in that the structure of the trigger mechanism 53 is different. In this example, the trigger mechanism 53 includes a magnet 533 and a reed switch 534. The magnet 533 is connected to the slider 51 and can move with the slider 51. The reed switch 534 is connected to the device housing, is stationary, and is fixed to the circuit board 7. When the magnet 533 is close to the reed switch 534, the reed switch 534 can be triggered to connect the two conductive pins. Properly connecting the reed switch 534 with the displacement pump 3 and the circuit board 7 can realize that the on and off of the displacement pump 3 is triggered by the reed switch 534.

[0042] Example 4 like Fig.12 and Fig.13 As shown, Figure 1 and Fig. 9 The difference from the embodiment 1 shown is that the driving liquid storage container 1 and the battery 6 have different shapes, and the driving liquid storage container 1 and the battery 6 are distributed differently, and an isolation layer 8 is added. In this example, the driving liquid storage container 1 and the battery 6 are both L-shaped, which is different from the I-shaped in embodiment 1; the battery 6 is distributed on the rear side of the driving liquid storage container 1, which is different from the side-by-side distribution with the driving liquid storage container 1 in embodiment 1.

[0043] The circuit board 7 is placed at the bottom, an L-shaped battery 6 is placed on top, and an L-shaped driving liquid storage container 1 is placed on top of the battery 6. Considering the risk of leakage of the driving liquid storage container 1, an isolation layer 8 is added between the driving liquid storage container 1 and the electrical part (battery 6 and circuit board 7) and between the driving liquid storage container 1 and the volumetric pump 3 in this example.

[0044] Example 5 like Fig.14 As shown, this example is Fig.13 The difference of the embodiment 4 shown is that the L-shaped battery 6 is placed at the bottom, the circuit board 7 is placed on top, and the L-shaped driving liquid storage container 1 is placed on the circuit board 7. Considering the risk of leakage of the driving liquid storage container 1, an isolation layer 8 is added between the driving liquid storage container 1 and the electrical part (battery 6 and circuit board 7) and between the driving liquid storage container 1 and the volumetric pump 3 in this embodiment.

[0045] Example 6 like Fig.15 As shown, the device is shown in a vertical position, with the liquid outlet of the drug reservoir 2 facing upward.

[0046] In the initial state, the piston 21 of the drug storage container 2 is placed at the rear end ( Fig.15 The lower end of the drug storage chamber 22), that is, close to the side of the driving chamber 23, the user can add medicine from the dosing port 281 on the upper end of the product (the dosing port 281 can also be set on the side). The medicine solution enters the drug storage chamber 22 through the dosing channel 28, and the gas originally retained in the drug storage chamber 22 can be discharged from the exhaust and infusion channel 29. Taking advantage of the fact that the gas goes upward when the product is placed vertically during dosing, the front end of the drug storage chamber 22 is designed to be pointed, and the inlet of the exhaust and infusion channel 29 is designed in the middle of the pointed top 221 (or the top), and has a trumpet-shaped opening to facilitate exhaust, so that there is no gas residue in the drug storage chamber 22, preventing air from being pushed into the human body and causing harm. Users can use acupuncture III 25 (reference Figure 8 ) to determine whether the filling is complete by the appearance of liquid drops at the needle outlet.

[0047] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic infusion device, characterized in that: include: A driving liquid storage container (1), used for storing the driving liquid; A medicine reservoir (2), the medicine reservoir (2) comprising a piston (21), a medicine storage chamber (22) arranged in front of the piston (21), and a drive chamber (23) arranged in the rear of the piston (21), the piston (21) being able to slide in the medicine reservoir (2) to change the size of the medicine storage chamber (22) and the drive chamber (23), and the drive chamber (23) being provided with an exhaust port (24); A displacement pump (3), the displacement pump (3) comprising a liquid inlet and a liquid outlet, the liquid inlet being used to be connected to the drive liquid storage container (1), and the liquid outlet being used to be connected to the drive chamber (23); An exhaust component (4), the exhaust component (4) being used to exhaust gas from the displacement pump (3) and the drive chamber (23), the exhaust component (4) comprising a discharge channel (41), a waterproof breathable membrane (42) being permeable to air but not permeable to liquid being provided on the cross section of the discharge channel (41), and the discharge channel (41) and the drive chamber (23) being in two states: connected and closed.

2. The hydraulic infusion device according to claim 1, characterized in that: The exhaust assembly (4) comprises a plug I (43) and a pull-out plug (44), wherein the plug I (43) is arranged at the exhaust port (24), the pull-out plug (44) is provided with the exhaust channel (41), and the pull-out plug (44) is provided with a hollow puncture needle I (45) for piercing the plug I (43), and when the puncture needle I (45) pierces the plug I (43), the drive chamber (23) is connected to the exhaust channel (41).

3. The hydraulic infusion device according to claim 2, characterized in that: The extraction plug (44) comprises a first part (441) and a second part (442), the puncture needle I (45) being embedded in the first part (441), the waterproof breathable membrane (42) being embedded between the first part (441) and the second part (442), and a pressure sensor being arranged in the volumetric pump (3).

4. The hydraulic infusion device according to claim 1, characterized in that: The invention also comprises a connection switch (5), wherein the connection switch (5) comprises a slider (51), wherein the slider (51) has an inner cavity (511), wherein the inner cavity (511) is connected to the drive liquid storage container (1), wherein a plug II (52) is arranged on the slider (51), wherein the inner surface of the plug II (52) is connected to the inner cavity (511), and wherein a hollow puncture needle II (31) is arranged at the liquid inlet of the volumetric pump (3), wherein the slider (51) is slidably arranged and can slide to allow the puncture needle II (31) to pierce the plug II (52) so as to connect the inner cavity (511) to the volumetric pump (3).

5. The hydraulic infusion device according to claim 4, characterized in that: The connection switch (5) is provided with a trigger mechanism (53), and the trigger mechanism (53) is triggered when the puncture needle II (31) pierces the obstruction II (52). When the trigger mechanism (53) is triggered, the volume pump (3) is started.

6. The hydraulic infusion device according to claim 1, characterized in that: The driving liquid storage container (1) is a liquid bag formed by hot pressing of a composite flexible film material, and is elastically expanded after being filled with a fixed volume of driving liquid.

7. The hydraulic infusion device according to claim 1, characterized in that: The medicine storage device (2) is also provided with a movable puncture needle III (25), the puncture needle III (25) is communicated with the medicine storage cavity (22), and the puncture needle III (25) is connected to a shifting block (26).

8. The hydraulic infusion device according to claim 1, characterized in that: An isolation layer (8) is provided between the drive liquid storage container (1) and the displacement pump (3) and / or between the drive liquid storage container (1) and the electrical part.

9. The hydraulic infusion device according to claim 1, characterized in that: The medicine storage cavity (22) is connected to a medicine adding channel (28), the front end of the medicine storage cavity (22) has a pointed top (221), and the pointed top (221) is connected to a flared exhaust and infusion channel (29), with the flared end close to the pointed top (221).

10. A hydraulic infusion method, wherein a displacement pump is used to pump a driving liquid in a driving liquid storage container to a drug storage container, so that the driving liquid drives a piston in the drug storage container to move so that the drug liquid in front of the piston is discharged, and an exhaust step is performed before the drug liquid discharge operation, and the gas in the driving cavity of the driving liquid storage container, the displacement pump and the drug storage container is discharged by the exhaust step, characterized in that: The exhaust step includes using an exhaust component to connect the drive chamber to the outside world in a gas-permeable and liquid-impermeable manner, and after the exhaust is completed, removing the exhaust component and closing the connection between the drive chamber and the outside world by plugging.

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