Novel needleless injector equipment

Abstract

The invention relates to the technical field of needleless injectors, and discloses novel needleless injector equipment which is composed of a shell, a liquid medicine bottle and an injection mechanism. The liquid medicine bottle is communicated with the injection medicine cylinder of the injection mechanism, and when injection is needed, liquid medicine is firstly extracted into the injection medicine cylinder from the liquid medicine bottle through the first liquid inlet hole. One end of the cylindrical channel is connected with the nozzle, and the other end of the cylindrical channel is connected with the piston rod. The power assembly controls movement of the piston rod through the excitation assembly. A conduction valve is further arranged in the injection medicine cylinder, and a second annular channel is formed through the outer annular groove and the inner annular groove so as to prevent liquid medicine from flowing back. A small medicine storage tube is arranged at the end, close to the injection tube, of the piston rod and used for storing liquid medicine. In the injection process, the power assembly pulls the piston rod to form vacuum negative pressure, so that liquid medicine is sucked into the injection tube through the third medicine inlet hole and the small medicine storage tube. The power assembly pushes the piston rod to reversely move at a high speed, and liquid medicine is injected at high pressure through the injection pipe and the nozzle.

Description

Technical Field

[0001] The invention relates to the technical field of needle-free syringes, in particular to a new needle-free syringe device. Background Art

[0002] Needle-free syringes are special medical devices designed to inject drugs or vaccines directly into the subcutaneous or muscle tissue without using traditional needles. The drug solution is injected into the skin through high-pressure jet technology, which effectively reduces the pain and avoids the risk of infection caused by traditional needle injections.

[0003] The existing needle-free syringe includes a drug storage tube and an injection cylinder, which are connected by a control valve. When performing an injection, the control valve needs to be opened first to allow the drug liquid inside the drug storage tube to enter the injection cylinder. When performing the injection, the control valve needs to be closed to avoid the problem of the drug liquid inside the injection cylinder flowing back to the drug storage tube when the drug liquid is pressurized. Then, during the above injection operation, the control valve needs to be repeatedly opened and closed, which makes the injection operation troublesome and the work efficiency is low when performing batch injections on livestock.

[0004] Therefore, we propose a new needle-free injection device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a new needle-free syringe device to solve the problem that the existing needle-free syringe proposed in the above background technology needs to operate the control valve to adjust the switch between the drug storage tube and the injection cylinder, which causes troublesome operation and reduces the injection work efficiency.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A new needle-free syringe device comprises a housing, a liquid medicine bottle and an injection mechanism, wherein the injection mechanism is installed inside the housing, the liquid medicine bottle is installed outside the housing and is connected to the injection mechanism, the injection mechanism comprises an injection cylinder for storing and compressing injection medicine, a power assembly and an excitation assembly for controlling the switch of the power assembly, the injection cylinder is fixedly connected to the housing, and the power assembly and the excitation assembly are both installed inside the housing;

[0008] The housing is provided with a docking port, the liquid medicine bottle is detachably connected to the docking port, a first liquid inlet hole is provided on a side of the injection medicine cylinder close to the liquid medicine bottle, and the docking port is connected to the first liquid inlet hole of the injection medicine cylinder through a connecting pipe;

[0009] A cylindrical channel is provided inside the injection cylinder, one end of the cylindrical channel is fixedly connected to a nozzle, a one-way valve is installed between the injection tube and the nozzle, and the other end of the cylindrical channel of the injection cylinder is slidably connected to a piston rod. The power component drives the piston rod forward to slide from one end of the cylindrical channel close to the nozzle toward the first liquid inlet hole, so that a vacuum negative pressure is generated in the cylindrical channel. When the first liquid inlet hole is connected to the cylindrical channel, the liquid in the liquid bottle is drawn into the cylindrical channel of the injection cylinder by the vacuum negative pressure.

[0010] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0011] The needle-free syringe of the present invention realizes the automatic drug feeding function without manual operation of the drug feeding valve, greatly simplifies the injection process, and improves the convenience of operation. First, the drug liquid bottle can be quickly connected or disconnected with the injection mechanism through the docking port on the device housing by sealed plug-in or threaded connection, without the need to use a needle or other tools. Secondly, a first liquid inlet hole is provided on the side of the injection medicine cylinder close to the drug liquid bottle. After being connected to the drug liquid bottle, the drug liquid bottle and the injection medicine cylinder are connected, reducing the drug feeding valve in the traditional syringe. In order to prevent the backflow of the drug liquid during the injection process, a one-way valve is installed between the injection tube and the nozzle, and a conduction valve is also provided inside the injection medicine cylinder. The flow of the drug liquid is controlled through multiple second liquid inlet holes to ensure that the drug liquid flows from the first annular channel into the inner annular groove and then enters the injection tube. When preparing for injection, the power assembly starts and pulls the piston rod to form a vacuum negative pressure inside the injection tube. At this time, the drug liquid is sucked into the injection tube through the connection between the third drug inlet hole and the second annular channel. During the injection process, the power assembly pushes the piston rod to move in the opposite direction. The movement of the piston rod disconnects the third medicine inlet hole from the second annular channel. At the same time, the medicine hole enters the injection tube. The sealing ring ensures that the medicine hole is closed to prevent backflow. This design not only realizes the automatic inhalation and injection of the medicine liquid, but also effectively prevents the backflow of the medicine liquid during the injection process, thereby simplifying the operation steps and improving the injection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall external front structure of the present invention;

[0013] Figure 2 It is a schematic diagram of the overall external rear structure of the present invention;

[0014] Figure 3 It is a schematic diagram of the structure inside the housing of the present invention;

[0015] Figure 4 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0016] Figure 5 It is a schematic diagram of the installation structure of the driving cam of the present invention;

[0017] Figure 6 This is a schematic diagram of the installation structure of the internal conduction valve of the injection medicine cylinder of the present invention;

[0018] Figure 7 It is a schematic cross-sectional structural diagram of the conduction valve of the present invention;

[0019] Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure of

[0020] Fig. 9 It is a schematic cross-sectional structure diagram of the piston rod inside the injection cylinder of the present invention;

[0021] Fig.10 For the present invention Fig. 9 Schematic diagram of the enlarged structure at B.

[0022] Among them: 1. Shell; 2. Medicine bottle; 3. Docking port; 4. First liquid inlet; 5. Connecting pipe; 6. Injection cylinder; 7. Nozzle; 8. Piston rod; 9. Injection tube; 10. One-way valve; 11. Conducting valve; 12. Outer annular groove; 13. First annular channel; 14. Inner annular groove; 15. Second liquid inlet; 16. Sealing ring; 17. Second annular channel; 18. Medicine storage tube; 19. Third medicine inlet; 20. Mounting seat; 21. Motor; 22 , reducer; 23, driving cam; 24, lever; 25, turntable; 26, spiral plate; 27, spring sleeve; 28, compression spring; 29, driving rod; 30, slider; 31, gun handle; 32, built-in battery; 33, main control module; 34, display screen; 35, control motherboard; 36, operation button; 37, pressing sleeve; 38, reset spring; 39, metal sensor switch one; 40, round gun head; 41, trigger; 42, metal sensor switch two. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0024] Embodiment 1:

[0025] See also Figure 1-10 , the present invention provides a technical solution:

[0026] A new needle-free syringe device includes a shell 1, a medicine bottle 2 and an injection mechanism. The injection mechanism is installed inside the shell, and the medicine bottle 2 is installed outside the shell 1 and is connected to the injection mechanism. The medicine in the medicine bottle 2 is extracted by the injection mechanism, and the medicine is injected into the body of an object, such as a pig, cattle, sheep or other animal, by high-pressure spraying, thereby completing needle-free injection.

[0027] Furthermore, the housing 1 is provided with a docking port 3, and the liquid medicine bottle 2 is detachably connected to the docking port 3; the liquid medicine bottle 2 and the docking port 3 may be sealed plug-in or threadedly connected;

[0028] The injection mechanism includes an injection cylinder 6, a power component and an excitation component. The injection cylinder 6 is fixedly connected to the inside of the shell 1 and is used for storing and compressing injection drugs. The excitation component is used to control the switch of the power component. Both the power component and the excitation component are installed inside the shell 1.

[0029] A first liquid inlet hole 4 is provided on one side of the injection cylinder 6 close to the medicine bottle 2, and the docking port 3 is connected to the first liquid inlet hole 4 of the injection cylinder 6 through a connecting pipe 5, thereby connecting the interior of the medicine bottle 2 with the interior of the injection cylinder 6, so that the medicine in the medicine bottle 2 can enter the interior of the injection cylinder 6.

[0030] A cylindrical channel is provided inside the injection cylinder 6, one end of the cylindrical channel is fixedly connected to a nozzle 7, and the other end of the cylindrical channel is slidably connected to a piston rod 8, and the piston rod 8 is driven to move by a power component; after the drug liquid enters the cylindrical channel from the drug liquid bottle 2, the power component pushes the piston rod 8 to quickly compress the drug liquid, generating instantaneous high pressure; under the action of high pressure, the drug is released through the nozzle 7 in the syringe in the form of a high-speed jet stream exceeding 100m / s. This high-speed jet stream can penetrate the surface of the skin and reach the subcutaneous and intradermal tissues directly, thereby achieving rapid penetration of the drug and effective release of the drug efficacy.

[0031] Furthermore, one end of the injection cylinder 6 close to the nozzle 7 is fixedly connected to the injection tube 9, and a one-way valve 10 is installed between the injection tube 9 and the nozzle 7. The one-way valve 10 only allows the medicine to flow from the injection tube 9 to the nozzle 7 to prevent the medicine from flowing back. The inner cavity of the injection tube 9 is adapted to the shape of the piston rod 8, and the piston rod 8 is slidably connected to the inside of the injection tube 9. After the medicine enters the injection cylinder 6 and flows to the inner cavity of the injection tube 9, the piston rod 8 moves from the injection cylinder 6 to the injection tube 9, and the medicine in the injection cylinder 6 and the injection tube 9 is compressed and injected together.

[0032] Furthermore, a conducting valve 11 is provided inside the injection cylinder 6, and an outer annular groove 12 is provided outside the conducting valve 11. A first annular channel 13 is formed between the annular groove of the conducting valve 11 and the inner wall of the injection cylinder 6. The first liquid inlet hole 4 is connected to the first annular channel 13. An inner annular groove 14 is provided inside the conducting valve 11. A plurality of second liquid inlet holes 15 are provided between the outer annular groove 12 and the inner annular groove 14. The inner annular groove 14 is connected to the injection tube 9; thereby, the medicinal liquid enters the first annular channel 13 from the first liquid inlet hole 4, and then enters the inner annular groove 14 from the first annular channel 13 through the plurality of second liquid inlet holes 15, and flows to the inside of the injection tube 9.

[0033] The conducting valve 11 is provided with sealing rings 16 on both sides of the inner annular groove 14. The inner diameter of the sealing ring 16 is the same as the outer diameter of the piston rod 8. When the piston rod 8 moves to the inner annular groove 14, the two sealing rings 16 tightly fit the outside of the piston rod 8, that is, the conducting valve 11 and the injection tube 9 are closed, and a sealed second annular channel 17 is formed between the inner annular groove 14, the sealing rings 16 on both sides of the inner annular groove 14 and the piston rod 8; the medicine stays in the second annular channel 17 and cannot flow between the conducting valve 11 and the injection tube 9, so that the piston rod 8 propelled at high speed pressurizes the medicine inside the injection tube 9, preventing the medicine inside the injection tube 9 from flowing back to the injection cylinder 6, which is conducive to the stable injection of the medicine inside the injection tube 9.

[0034] Furthermore, a small drug storage tube 18 is radially opened inside the end of the piston rod 8 close to the injection tube 9, and the small drug storage tube 18 is connected to the inside of the injection tube 9. A plurality of third drug inlet holes 19 connected to the small drug storage tube 18 are opened on the piston rod 8, and the third drug inlet holes 19 are located at the end of the small drug storage tube 18 away from the injection tube 9.

[0035] When injection is needed, the power assembly pulls the piston rod 8 to move from the injection tube 9 in the direction of the guide valve 11. Since the one-way valve 10 is provided at the liquid outlet of the injection tube 9, the outside air cannot enter the injection tube 9, so that a vacuum negative pressure is formed inside the injection tube 9, and the piston rod 8 continues to move in this direction. When the third drug inlet 19 is connected to the inside of the second annular channel 17, the piston rod 8 stops moving. The vacuum negative pressure inside the injection tube 9 quickly sucks the drug liquid inside the second annular channel 17 into the injection tube 9 through the third drug inlet 19 and the drug storage tube 18, and the drug feeding is completed; start the injection. During injection, the power assembly pushes the piston rod 8 in the reverse direction at high speed. When the piston rod 8 moves toward the inside of the injection tube 9, the third medicine feed hole 19 is offset from the second annular channel 17. At the same time, the third medicine feed hole 19 passes through the sealing ring 16 of the inner annular groove 14 and enters the inside of the injection tube 9. At this time, the sealing ring 16 first blocks the third medicine feed hole 19. When the third medicine feed hole 19 enters the inside of the injection tube 9, the inner wall of the injection tube 9 fits with the third medicine feed hole 19 to seal it. Therefore, the problem of backflow of the medicine inside the injection tube 9 when the piston compresses the medicine inside the injection tube 9 is effectively solved.

[0036] This structure allows rapid drug feeding and effectively prevents drug liquid backflow, avoiding the need to set a valve for drug feeding switch control at the drug feeding port of the injection drug cylinder 6 in the prior art, making the drug feeding and injection operation steps of the needle-free injection gun simple and improving the efficiency of the injection work.

[0037] The power assembly includes a mounting base 20, a driving source and a transmission module. The mounting base 20 is fixedly connected to the housing 1, the driving source is fixed on the mounting base 20, the transmission module is connected to the mounting base 20, the mounting base 20 provides stable support for the transmission module, the driving source drives the transmission module, the transmission module is connected to the piston rod 8, and the transmission module drives the piston rod 8 to reciprocate, thereby providing power for the needle-free syringe.

[0038] The driving source is a combination of a motor 21 and a reducer 22 , and the motor 21 drives the reducer 22 to rotate.

[0039] The transmission module includes a driving cam 23, a lever 24 and an energy storage telescopic member. The outside of the energy storage telescopic member is fixedly connected to the mounting seat 20, the driving cam 23 is fixed to the driving shaft of the reducer 22, and the lever 24 is connected to one end of the energy storage telescopic member.

[0040] The driving cam 23 includes a turntable 25 and a spiral plate 26. The center of the turntable 25 is fixedly connected to the driving shaft. The spiral plate 26 is fixedly connected to the side of the turntable 25 away from the mounting seat 20. The axis of the spiral plate 26 coincides with the axis of the turntable 25. The lever 24 is located on the side of the spiral plate 26 installed on the driving cam 23. The rotating reducer 22 causes the driving cam 23 to rotate. The spiral plate 26 contacts the lever 24 with its spiral edge. When the spiral edge rotates, the lever 24 gradually contacts the most protruding edge of the spiral edge, thereby pushing the lever 24 to move away from the mounting seat 20. The energy storage telescopic part gradually stores energy. When the spiral edge rotates to its most concave part and contacts the lever 24, the lever 24 instantly breaks away from the spiral edge. At the same time, the stored energy of the energy storage telescopic part is released, pushing the piston rod 8 to advance into the injection tube 9 at high speed. The driving cam 23 intermittently pushes the lever 24 to move, and the lever 24 moves back and forth, so that the energy storage telescopic member can store and release energy, so that the energy storage telescopic member pulls the piston rod 8 and releases the stored energy to propel it in a high-speed direction.

[0041] Furthermore, the energy storage telescopic member includes a spring sleeve 27, a compression spring 28, and a driving rod 29. The spring sleeve 27 is fixedly connected to the mounting seat 20, the driving rod 29 is slidably sleeved with the mounting seat 20, one end of the driving rod 29 is fixedly connected to the piston rod 8, and the other end of the driving rod 29 is fixedly connected to the lever 24. The end of the driving rod 29 close to the piston rod 8 is fixedly connected with a slider 30, and the slider 30 is slidably connected to the inner wall of the spring sleeve 27. The compression spring 28 is sleeved on the outside of the driving rod 29 and is located on the side of the slider 30 away from the piston rod 8. When the lever 24 pulls the driving rod 29 to move in a direction away from the piston rod 8, the slider 30 moves with the driving rod 29 and compresses the compression spring 28 on the driving rod 29. 8 is compressed to store energy. When the lever 24 loses contact with the spiral edge of the spiral plate 26, the energy stored in the compression spring 28 is released instantly, and the compression spring 28 pushes the slider 30 in the opposite direction. Driven by the slider 30, the driving rod 29 moves at a high speed toward the injection tube 9. At the same time, the driving rod 29 pushes the piston rod 8 to enter the injection tube 9 at a high speed, pressurizes the liquid medicine in the injection tube 9, and makes it enter the nozzle 7 through the one-way valve 10 at the front end of the injection tube 9. The aperture of the nozzle 7 is smaller, so that the pressure of the liquid medicine is further increased; the liquid medicine forms a high-speed, high-pressure jet (the flow rate is generally greater than 100m / s) through the nozzle 7, so that the drug penetrates the outer layer of the skin to the subcutaneous, intradermal and other tissue layers to release its efficacy.

[0042] The shell 1 is designed to imitate a gun shape as a whole. A gun handle 31 is provided on the side of the shell 1 away from the medicine bottle 2. A built-in battery 32 is installed inside the gun handle 31, and the built-in battery 32 is used to power the excitation component.

[0043] The excitation component includes a main control module 33, a first control switch, and a second control switch. The main control module 33 is installed at one end of the housing 1 away from the nozzle 7. The main control module 33 includes a display screen 34, a control main board 35, and an operation button 36. The display screen 34 is located outside the housing 1 and is fixedly connected to the housing 1. The operation button 36 is fixedly connected to the housing 1. The operation button 36 is electrically connected to the control main board 35. The control main board 35 controls the switch and speed of the motor 21. The display screen 34 is electrically connected to the control main board 35 for displaying the operation interface, so as to facilitate the electric control of the needle-free syringe.

[0044] The control main board 35 is operated by operating the operation button 36. The control main board 35 controls the number of revolutions of the motor 21, thereby controlling the rotation angle of the driving cam 23, so that the lever 24 contacts the most protruding position of the spiral edge of the driving cam 23, so that the driving cam 23 pushes the lever 24 to the right, and the lever 24 pulls the driving rod 29 of the energy storage telescopic part to the right to complete the energy storage work of the energy storage telescopic part. At this time, it is only necessary to control the motor 21 to drive the driving cam 23 to rotate at a smaller angle, and the lever 24 enters the lowest point of the driving cam 23. At this time, the lever 24 suddenly loses contact with the driving cam 23, and the energy stored in the compression spring 28 is instantly released. The energy storage telescopic part pushes the piston rod 8 to perform high-pressure injection. The process of the above-mentioned energy storage telescopic part pushing the piston rod 8 to perform high-pressure injection is the excitation operation of the needle-free syringe.

[0045] The needle-free syringe of the present invention controls the activation operation by the first control switch and the second control switch, which is a double insurance design to prevent misoperation and ensure the safety of the device. The first control switch and the second control switch are both electrically connected to the control main board 35, and the activation operation will be started only when the first control switch and the second control switch are triggered at the same time.

[0046] The first control switch includes a pressing sleeve 37, a return spring 38, and a metal induction switch 39. The metal induction switch 39 is electrically connected to the control main board 35. A circular gun head 40 is designed at one end of the housing 1 close to the nozzle 7. The pressing sleeve 37 is slidably sleeved on the outside of the circular gun head 40. One end of the return spring 38 is fixedly connected to the outside of the circular gun head 40, and the other end of the return spring 38 is fixedly connected to the inside of the pressing sleeve 37. The metal induction switch 39 is fixed at one end of the housing 1 close to the circular gun head 40. The return spring 38 pushes the pressing sleeve 37 along the The round gun head 40 slides radially outward, the pressing sleeve 37 is separated from the metal induction switch 1 39, and the metal induction switch 1 39 is in the disconnected state. When injecting, the gun handle 31 is held tightly, and the pressing sleeve 37 is brought into contact with the surface of the animal's skin, so that the pressing sleeve 37 slides along the outside of the round gun head 40 and contacts the metal induction switch 1 39, so that the circuit of the metal induction switch 1 39 is turned on, and the control main board 35 receives the circuit signal, but at this time the second control switch is in the disconnected state, and the control main board 35 does not start the excitation operation;

[0047] The second control switch includes a trigger 41 and a second metal sensing switch 42. The second metal sensing switch 42 is electrically connected to the control main board 35. The trigger 41 is installed on the side of the gun handle 31 close to the nozzle 7. The second metal sensing switch 42 is fixedly connected to the inside of the gun handle 31. When the trigger 41 is pulled, the inner side of the trigger 41 contacts the sensing part of the second metal sensing switch 42, so that the second metal sensing switch 42 is in a conducting state. When the control main board 35 receives the electrical signals of the first control switch and the second control switch at the same time, the excitation operation is started to perform needle-free injection.

[0048] How the new needle-free injector device works:

[0049] First, the medicine bottle 2 is connected to the connecting pipe 5 of the syringe housing 1 through the docking port 3, and the medicine in the medicine bottle 2 can enter the injection cylinder 6 through the first liquid inlet hole 4. At the same time, a cylindrical channel is provided inside the injection cylinder 6, one end of the channel is connected to the nozzle 7, and the other end is internally slidably connected to the piston rod 8, and the piston rod 8 is driven by the power component to move at high speed.

[0050] When injection is required, the power assembly pulls the piston rod 8 to form a vacuum negative pressure inside the injection tube 9 connected to the injection cylinder 6. When the third medicine inlet hole 19 on the piston rod 8 is connected to the second annular channel 17, the medicine liquid is sucked into the medicine storage tube 18 and flows into the injection tube 9; then, the power assembly pushes the piston rod 8 to move in the opposite direction at high speed, compressing the medicine liquid to form high pressure, and enters the nozzle 7 through the one-way valve 10 at the front end of the injection tube 9.

[0051] Under the action of high pressure, the drug solution is released in the form of a high-speed jet stream exceeding 100m / s. This high-speed jet stream can penetrate the surface of the skin and reach the subcutaneous and intradermal tissues directly, achieving rapid drug penetration and effective release of drug efficacy.

[0052] At the same time, a conduction valve 11 is arranged inside the injection medicine cylinder 6. Through the action of the conduction valve 11 and the sealing ring 16, the backflow of the medicine liquid is prevented, thereby ensuring the stability of the injection process.

[0053] The excitation component includes a main control module 33, a first control switch and a second control switch, and realizes electric control through an operation button 36 and a display screen 34. During injection, the injection position is first confirmed through the first control switch, and then the excitation operation is started through the second control switch to complete the needle-free injection. The needle-free injection device realizes rapid, stable and safe injection of the liquid medicine through the coordinated work of the liquid medicine bottle 2, the injection cylinder 6, the piston rod 8, the power component, the excitation component and other components.

[0054] Although specific embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the specific embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new needle-free injection device, comprising a housing (1), a liquid medicine bottle (2) and an injection mechanism, wherein the injection mechanism is installed inside the housing, and the liquid medicine bottle (2) is installed outside the housing (1) and communicated with the injection mechanism, characterized in that: The injection mechanism comprises an injection medicine cylinder (6) for storing and compressing injection medicine, a power assembly and an excitation assembly for controlling the switch of the power assembly, the injection medicine cylinder (6) is fixedly connected to the inside of the housing (1), and the power assembly and the excitation assembly are both installed inside the housing (1); The housing (1) is provided with a docking port (3), the liquid medicine bottle (2) and the docking port (3) are detachably connected, a first liquid inlet hole (4) is provided on a side of the injection medicine cylinder (6) close to the liquid medicine bottle (2), and the docking port (3) is connected to the first liquid inlet hole (4) of the injection medicine cylinder (6) through a connecting pipe (5); A columnar channel is provided inside the injection medicine cylinder (6), one end of the columnar channel is fixedly connected to a nozzle (7), a one-way valve (10) is installed between the injection tube (9) and the nozzle (7), and the other end of the columnar channel of the injection medicine cylinder (6) is slidably connected to a piston rod (8), and a power component drives the piston rod (8) to slide from one end of the columnar channel close to the nozzle (7) toward the first liquid inlet hole (4), so that a vacuum negative pressure is generated in the columnar channel. When the first liquid inlet hole (4) is connected to the columnar channel, the liquid in the liquid bottle (2) is drawn into the columnar channel of the injection medicine cylinder (6) by the vacuum negative pressure.

2. A new needle-free injection device according to claim 1, characterized in that: One end of the injection cylinder (6) close to the nozzle (7) is fixedly connected to an injection tube (9), and a one-way valve (10) is installed between the injection tube (9) and the nozzle (7); the inner cavity of the injection tube (9) is matched with the outer shape of the piston rod (8), and the piston rod (8) is slidably sleeved inside the injection tube (9).

3. A new needle-free injection device according to claim 2, characterized in that: The injection cylinder (6) is provided with a conducting valve (11) inside, and an outer annular groove (12) is provided outside the conducting valve (11). A first annular channel (13) is formed between the annular groove of the conducting valve (11) and the inner wall of the injection cylinder (6). The first liquid inlet hole (4) is connected to the first annular channel (13). An inner annular groove (14) is provided inside the conducting valve (11). A plurality of second liquid inlet holes (15) are provided between the outer annular groove (12) and the inner annular groove (14). The inner annular groove (14) is connected to the injection tube (9); thereby, the drug liquid enters the first annular channel (13) from the first liquid inlet hole (4), and then enters the inner annular groove (14) from the first annular channel (13) through the plurality of second liquid inlet holes (15), and flows into the inside of the injection tube (9).

4. A new needle-free injection device according to claim 3, characterized in that: The conduction valve (11) is provided with sealing rings (16) on both sides of the inner annular groove (14); the inner diameter of the sealing ring (16) is the same as the outer diameter of the piston rod (8); and a sealed second annular channel (17) is formed between the inner annular groove (14), the sealing rings (16) on both sides of the inner annular groove (14), and the piston rod (8).

5. A new needle-free injection device according to claim 4, characterized in that: A drug storage tube (18) is radially provided inside the end of the piston rod (8) close to the injection tube (9), and the drug storage tube (18) is connected to the inside of the injection tube (9). A third drug inlet hole (19) is provided on the piston rod (8) and is connected to the drug storage tube (18). The third drug inlet hole (19) is located at the end of the drug storage tube (18) away from the injection tube (9).

6. A new needle-free injection device according to claim 1, characterized in that: The power assembly comprises a mounting seat (20), a driving source and a transmission module; the mounting seat (20) is fixedly connected to the housing (1); the driving source is fixed on the mounting seat (20); the transmission module is connected to the mounting seat (20); the mounting seat (20) stably supports the transmission module; the transmission module is driven by the driving source; and the transmission module is connected to the piston rod (8).

7. A new needle-free injection device according to claim 6, characterized in that: The transmission module comprises a driving cam (23), a lever (24) and an energy storage telescopic member. The outside of the energy storage telescopic member is fixedly connected to the mounting seat (20). The driving cam (23) is fixed to the driving shaft of the reducer (22). The lever (24) is connected to one end of the energy storage telescopic member. The driving cam (23) comprises a rotating disk (25) and a spiral plate (26). The center of the rotating disk (25) is fixedly connected to the driving shaft. The spiral plate (26) is fixedly connected to a side of the rotating disk (25) away from the mounting seat (20). The axis of the spiral plate (26) and the rotating disk (25) coincide. The lever (24) is located on one side of the spiral plate (26) mounted on the driving cam (23). The rotating reducer (22) causes the driving cam (23) to rotate. The spiral plate (26) contacts the lever (24) with its spiral edge. When the spiral edge rotates, the lever (24) gradually contacts the most protruding edge of the spiral edge.

8. A new needle-free injection device according to claim 6, characterized in that: The energy storage telescopic member comprises a spring sleeve (27), a compression spring (28), and a driving rod (29); the spring sleeve (27) is fixedly connected to a mounting seat (20); the driving rod (29) is slidably sleeved with the mounting seat (20); one end of the driving rod (29) is fixedly connected to a piston rod (8); the other end of the driving rod (29) is fixedly connected to a lever (24); one end of the driving rod (29) close to the piston rod (8) is fixedly connected to a slider (30); the slider (30) is slidably connected to the inner wall of the spring sleeve (27); the compression spring (28) is sleeved on the outside of the driving rod (29) and is located on a side of the slider (30) away from the piston rod (8).

9. A new needle-free injection device according to claim 6, characterized in that: The excitation component comprises a main control module (33), a first control switch, and a second control switch. The main control module (33) is installed at one end of the housing (1) away from the nozzle (7). The main control module (33) comprises a display screen (34), a control main board (35), and an operation button (36). The display screen (34) is located on the outer side of the housing (1) and is fixedly connected to the housing (1). The operation button (36) is fixedly connected to the housing (1). The operation button (36) is electrically connected to the control main board (35). The control main board (35) controls the switch and speed of the motor (21). The display screen (34) is electrically connected to the control main board (35) for displaying an operation interface.

10. A new needle-free injection device according to claim 6, characterized in that: The first control switch comprises a pressing sleeve (37), a return spring (38), and a metal induction switch (39). The metal induction switch (39) is electrically connected to the control main board (35). A circular gun head (40) is designed at one end of the housing (1) close to the nozzle (7). The pressing sleeve (37) is slidably sleeved on the outside of the circular gun head (40). One end of the return spring (38) is fixedly connected to the outside of the circular gun head (40), and the other end of the return spring (38) is fixedly connected to the inside of the pressing sleeve (37). A metal induction switch (39) is fixed to one end of the housing (1) close to the circular gun head (40); the second control switch comprises a trigger (41) and a metal induction switch (42); the metal induction switch (42) is electrically connected to the control main board (35); a gun handle (31) is arranged on the side of the housing (1) away from the liquid medicine bottle (2); the trigger (41) is installed on the side of the gun handle (31) close to the nozzle (7); and the metal induction switch (42) is fixedly connected to the inside of the gun handle (31).

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