Microporous needleless injector

Abstract

The utility model relates to the technical field of needleless injectors, in particular to a micropore needleless injector, which comprises an injection part, a pipeline part and a nozzle part, the inner diameter of the nozzle part is gradually converged to an injection port along the liquid injection direction, and the diameter of the injection port is 0.13-0.25 mm; and the driving component provides power to perform pressurized injection on the liquid in the whole injection process, and comprises a pneumatic part connected with the outside and used for power, a trigger part used for controlling the pneumatic part, and an adjusting part used for accurately controlling the injection dosage each time. According to the design, the operation process is simplified, a user only needs to simply rotate the driving cap to complete dosage adjustment, complex tools or steps are not needed, and the risk of misoperation is reduced. The optimal design of an internal pneumatic system ensures that medicine can be quickly and stably injected into target tissue, high-pressure gas effectively pushes a piston body to achieve high-speed injection through reasonable gas path layout and the action of a pneumatic balance part, and meanwhile the continuous operation capacity is improved through the automatic liquid supplementing function.

Description

TECHNICAL FIELD

[0001] The utility model relates to needleless injector technical field, especially a micropore needleless injector. BACKGROUND

[0002] As an advanced drug delivery tool, needleless injectors have rapidly developed in the medical device field in recent years. Although traditional needle injection methods are widely used, they have disadvantages such as strong pain during operation, high risk of infection, and disposal problems after needle use. To solve these problems, needleless injection technology has emerged. It directly injects drugs into the epidermis and dermis of the skin through high-speed liquid flow or gas pressure, thereby avoiding many drawbacks of traditional needles. According to the patent literature of a drug tube for a needleless injector and its matching device (CN117504053A) proposed by our company, Jiangsu Leju Pharmaceutical Technology Co., Ltd., the invention is our first generation of needleless injector, which particularly emphasizes the feature of designing the injection port (i.e., the spray hole) as a micropore, significantly improving the effect and stability of intradermal injection. It not only optimizes the injection experience but also improves the drug absorption efficiency and reduces dose waste, which is of great significance for vaccine inoculation, local anesthesia, and other applications that require precise control of drug distribution.

[0003] With the continuous evolution of our needleless injection technology, we have successfully developed a new generation of needleless injectors to address the limitation of the first generation of needleless injectors in accurately controlling the dose in actual application. The new generation of products inherits the core advantages of the previous generation, such as the micropore injection port design to ensure the accuracy and stability of intradermal injection, and further optimizes the key technology and structural design, thereby significantly improving the overall performance and user experience. The new generation of needleless injectors represents the latest technological achievements of the company in this field, aiming to provide more efficient, safe, and easy-to-operate intradermal injection solutions. SUMMARY

[0004] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification, and the utility model name. Such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above or the problem that the injector cannot accurately control the dose in the prior art, the utility model is proposed.

[0006] To solve the above technical problems, the utility model provides technical scheme as follows: A kind of micropore needleless injector, including injection component, including pipeline part and nozzle part, wherein the nozzle part gradually converges inside diameter along liquid emission direction until emission port, the diameter of the emission port is 0.13-0.25mm, and its injection pressure is between 10MPa and 26MPa;

[0007] Driving component provides power to pressurized injection of liquid during the whole injection process, which includes pneumatic part connected with the outside world for power, trigger part for controlling the pneumatic part, and adjusting part for accurately controlling the dose of each injection.

[0008] As a preferred scheme of the utility model micropore needleless injector, wherein: the nozzle part is screwed at one end of the pipeline part, and the nozzle part is a first segment screwed with the pipeline part, a second segment is conical on one side of the first segment, the tip of the second segment is an emission port, and a cap is further provided on the outside of the nozzle part.

[0009] As a preferred scheme of the utility model micropore needleless injector, wherein: the pipeline part includes a main pipe body screwed with the driving component, a branch pipe body is provided on one side of the main pipe body, a one-way valve is installed on the branch pipe body, and a container for containing liquid can be installed above the one-way valve.

[0010] As a preferred scheme of the utility model micropore needleless injector, wherein: the pneumatic part is provided as a gun-shaped housing, a transverse gas chamber and a longitudinal gas chamber are provided inside the gun-shaped housing, the transverse gas chamber and the longitudinal gas chamber are communicated through a communication air channel and a balance air channel, and an air inlet is provided at the bottom of the longitudinal gas chamber.

[0011] As a preferred scheme of the utility model micropore needleless injector, wherein: a piston, a pneumatic balancing piece and a propelling body are provided in the transverse gas chamber, the piston is driven by high-pressure gas to push the propelling body to emit liquid in the pipeline part from the nozzle part, and the pneumatic balancing piece is used for resetting the piston and discharging high-pressure gas after work.

[0012] As a preferred scheme of the utility model micropore needleless injector, wherein: the adjusting part is provided at the transverse end of the gun-shaped housing, which includes a housing, the shaft and the driving cap installed inside the housing, the shaft is used to push the movement of the piston, and the driving cap is used to drive the movement of the shaft.

[0013] As a preferred scheme of the utility model micro -hole needleless injector, wherein: The trigger part is arranged at the transverse longitudinal intersection of the gun type shell, it includes safety buckle and puller, the safety buckle is used for forming structural protection to the puller, prevents the mistaken touch operation, the puller is used for controlling high pressure gas, controls the pneumatic process, provides trigger power for the injection process.

[0014] As a preferred scheme of the utility model micro -hole needleless injector, wherein: The piston piece includes piston body and spring one installed at one side thereof, and the spring one is used for pushing the piston body reset, the pneumatic balance piece includes moving block, and spring two is arranged at one side of the moving block.

[0015] As a preferred scheme of the utility model micro -hole needleless injector, wherein: The moving block is connected with the piston body, and one end of the propelling body is located in the piston body, and the other end is located at the end of the pipeline part.

[0016] As a preferred scheme of the utility model micro -hole needleless injector, wherein: The puller includes pressing block and push rod located in the inner side thereof, one end of the push rod is inserted in the air passage, and spring three is arranged on the push rod for resetting.

[0017] The utility model discloses the beneficial effects: the utility model discloses through installing the adjustment part, the accuracy of dose adjustment is greatly improved. In addition, the design simplifies the operation process, and the user can complete dose adjustment only by simply rotating the driving cap, does not need complicated tool or step, reduces the risk of misoperation. The optimization design of internal pneumatic system ensures that the drug can be quickly and smoothly injected into the target tissue, and through the reasonable air path layout and the action of pneumatic balance piece, the high-pressure gas effectively pushes the piston body to realize high-speed injection, and the automatic liquid supplementing function improves the continuous operation capacity. The patent is also particularly suitable for veterinary applications, and the injection parameters can be flexibly adjusted to adapt to the needs of animals of different body types and skin thickness, the larger aperture design reduces the risk of blockage and facilitates daily cleaning and maintenance, prolongs the service life of the equipment, and reduces operating costs. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor. Among them:

[0019] Figure 1 It is the micro -hole needleless injector appearance schematic view.

[0020] Figure 2 It is the micro -hole needleless injector section schematicFigure 1 .

[0021] Figure 3 Cross-sectional view of microneedleless injector Figure 2 .

[0022] Figure 4 Cross-sectional view of Figure 3 enlarged view of structure at A in

[0023] Figure 5 Cross-sectional view of connection between pneumatic part and adjustment part

[0024] Figure 6 Cross-sectional view of injection part

[0025] Figure 7 Cross-sectional view of nozzle part

[0026] In the drawings:

[0027] 100, injection part; 101, conduit part; 101a, main conduit body; 101b, branch conduit body; 101c, one-way valve; 102, nozzle part; 102a, first section; 102b, second section; 103, injection port;

[0028] 200, drive part; 201, pneumatic part; 201a, gun-shaped housing; 201b, piston member; 201b-1, piston body; 201b-2, spring one; 201c, pneumatic balance member; 201c-1, moving block; 201c-2, spring two; 201d, propelling body; 202, trigger part; 202a, safety catch; 202b, trigger member; 202b-1, pressing block; 202b-2, push rod; 202b-3, spring three; 203, adjustment part; 203a, housing; 203b, shaft body; 203c, drive cap; 204a, transverse air chamber; 204b, longitudinal air chamber; 204c, communication air passage; 204d, balance air passage; 204e, air inlet hole. DETAILED DESCRIPTION

[0029] In order to make the above objectives, features and advantages of the present application more apparent and understandable, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0030] In the following description, a lot of specific details are set forth in order to give a thorough understanding of the present application, but the present application can be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0031] Secondly, the "one embodiment" or "embodiment" referred to herein is intended to mean a specific feature, structure, characteristic, or combination of features and characteristics described herein that is included in at least one implementation of the present application. The various appearances of "in one embodiment" or "in an embodiment" in the specification are not necessarily all referring to the same embodiment.

[0032] Embodiment 1

[0033] Reference Figure 1 For the first embodiment of the present application, the embodiment provides a microporous needle-free injector, which comprises an injection component 100, the injection component 100 comprises a pipeline part 101 and a nozzle part 102, wherein the nozzle part 102 gradually converges in the inner diameter along the liquid ejection direction until the ejection port 103, the diameter of the ejection port 103 is 0.13-0.25mm, the injection pressure is between 10MPa to 26MPa; a driving component 200 provides power to pressurize and inject the liquid during the entire injection process, which comprises a pneumatic part 201 connected to the outside for power, a trigger part 202 for controlling the pneumatic part 201, and an adjusting part 203 for accurately controlling the dose of each injection.

[0034] Further, the nozzle part 102 is screwed at one end of the pipeline part 101, and the nozzle part 102 is divided into a first segment 102a screwed with the pipeline part 101, a second segment 102b with a conical shape on one side of the first segment 102a, and the tip of the second segment 102b is the ejection port 103, and a cap is further provided on the outside of the nozzle part 102. The pipeline part 101 comprises a main pipe body 101a screwed with the driving component 200, a branch pipe body 101b is provided on one side of the main pipe body 101a, a one-way valve 101c is installed on the branch pipe body 101b, and a container for containing liquid can be installed above the one-way valve 101c.

[0035] It should be noted that a propelling body 201d is provided at the end of the main pipe body 101a, when the liquid medicine enters the branch pipe body 101b through the one-way valve 101c, falls into the front end of the main pipe body 101a along the branch pipe body 101b, and then the propelling body 201d moves to pressurize the liquid at the front end of the main pipe body 101a and eject it from the nozzle part 102.

[0036] Further, the pneumatic part 201 is provided as a gun-shaped shell 201a, a transverse gas chamber 204a and a longitudinal gas chamber 204b are provided inside the gun-shaped shell 201a, the transverse gas chamber 204a and the longitudinal gas chamber 204b are communicated through a communication gas channel 204c and a balance gas channel 204d, and an air inlet hole 204e is provided at the bottom of the longitudinal gas chamber 204b for storing high-pressure gas.

[0037] The transverse air chamber 204a is connected with the longitudinal air chamber 204b through the communication air channel 204c, and a sealing pipe connected with the pipe section 101 is arranged in the transverse air chamber 204a, and the other end of the sealing pipe is provided with the shell 203a, so that the sealing pipe and the shell 203a form another independent air chamber in the transverse air chamber 204a, and the pneumatic balance piece 201c is located in the independent air chamber, so that the first air cavity is formed between the pneumatic balance piece 201c and the shell 203a, the first air cavity is communicated with the longitudinal air chamber 204b through the balance air channel 204d, and the trigger section 202 divides the balance air channel 204d into two sections.

[0038] Further, the piston piece 201b, the pneumatic balance piece 201c and the propelling body 201d are arranged in the transverse air chamber 204a, the piston piece 201b is driven by high-pressure gas to push the propelling body 201d to eject the liquid in the pipe section 101 from the nozzle section 102, and the pneumatic balance piece 201c is used for resetting the piston piece 201b and discharging the high-pressure gas after work. The piston piece 201b comprises a piston body 201b-1 and a spring I 201b-2 arranged on one side of the piston body 201b-1, and the spring I 201b-2 is used for pushing the piston body 201b-1 to reset, the pneumatic balance piece 201c comprises a moving block 201c-1, and a spring II 201c-2 is arranged on one side of the moving block 201c-1. The moving block 201c-1 is connected with the piston body 201b-1, one end of the propelling body 201d is located in the piston body 201b-1, and the other end is located at the end of the pipe section 101. The adjusting section 203 is arranged at the transverse end of the gun-shaped shell 201a, and comprises the shell 203a, a shaft body 203b arranged in the shell 203a and a driving cap 203c, the shaft body 203b is used for pushing the movement of the piston piece 201b, and the driving cap 203c is used for driving the movement of the shaft body 203b.

[0039] The adjusting section 203 needs to be explained, the shaft body 203b is provided with external threads, the inside of the shell 203a is provided with internal threads, the two are screwed, the shaft body 203b is provided with a limiting groove, the driving cap 203c is provided with a protruding block inserted into the limiting groove, so that rotating the driving cap 203c drives the shaft body 203b to rotate in the shell 203a, and one end of the shaft body 203b is located in the inside of the pneumatic balance piece 201c, and drives the movement of the pneumatic balance piece 201c.

[0040] Wherein the pneumatic balance piece 201c and the piston piece 201b need to be explained, the pneumatic balance piece 201c is located in the shell 203a, so that the adjustment of the shaft body 203b moves the position of the pneumatic balance piece 201c in the shell 203a, the pneumatic balance piece 201c and the shell 203a form a first air cavity, the first air cavity is communicated with the longitudinal air chamber 204b through the balance air channel 204d, the piston body 201b-1 of the piston piece 201b is pushed against the moving block 201c-1 of the pneumatic balance piece 201c by the spring 201b-2, the moving block 201c-1 is provided with a gas hole, the first air cavity injects gas between the piston body 201b-1 and the moving block 201c-1 through the gas hole, so as to push the piston body 201b-1 to move, and then push the propelling body 201d connected with the piston body 201b-1, the other end of the propelling body 201d moves at the end of the pipeline part 101, and the liquid in the pipeline part 101 is boosted to be shot out of the injection part. Wherein the piston body 201b-1 moves in the sealing tube, and the sealing tube forms an independent space in the gun-shaped shell 201a together with the shell 203a.

[0041] Further, the trigger part is arranged at the transverse and longitudinal intersection of the gun-shaped shell 201a, which includes the safety catch 202a and the trigger piece 202b, the safety catch 202a is used for forming structural protection for the trigger piece 202b to prevent accidental operation, and the trigger piece 202b is used for controlling high-pressure gas, controlling pneumatic process and providing trigger power for injection process. The trigger piece 202b includes the pressing block 202b-1 and the push rod 202b-2 inside it, one end of the push rod 202b-2 is inserted into the air channel, and the push rod 202b-2 is provided with the spring 202b-3 for resetting.

[0042] It should be noted that the balance air channel 204d passes through the trigger part 202, and is divided into two parts by the push rod 202b-2 of the trigger part 202, so that only the pressing block 202b-1 needs to be pressed, and the pressing block 202b-1 controls the movement of the push rod 202b-2 in cooperation with the spring 202b-3, the on-off of the balance air channel 204d can be controlled, so that the injection of the piston piece 201b can be controlled, and the injection purpose is achieved. The safety catch 202a can move vertically to the direction of the trigger part 202, so as to lock the position of the trigger part 202, and cooperate with the use of the trigger part 202.

[0043] The present embodiment greatly improves the accuracy of dose adjustment by installing the adjustment part 203. In addition, this design simplifies the operation process, and the user only needs to simply rotate the drive cap 203c to complete the dose adjustment, without the need for complex tools or steps, reducing the risk of misoperation. The optimized design of the internal pneumatic system ensures that the drug can be quickly and smoothly injected into the target tissue. Through reasonable gas path layout and the action of the pneumatic balancing piece 201c, high-pressure gas effectively pushes the piston body 201b-1 to achieve high-speed injection, and the automatic liquid supplementing function improves the continuous operation capability.

[0044] Embodiment 2

[0045] Reference Figures 2-3 For the second embodiment of the present application, unlike the previous embodiment, this embodiment provides a microporous needle-free injector, which includes an injection component 100, the injection component 100 includes a pipeline part 101 and a nozzle part 102, wherein the nozzle part 102 gradually converges in diameter along the liquid ejection direction until the ejection port 103, the diameter of the ejection port 103 is 0.13-0.25mm, and the injection pressure is between 10MPa and 26MPa.

[0046] The smaller the diameter of the ejection port 103, the more conducive to forming intradermal injection, however, the diameter cannot be infinitely small, and too small diameter of the ejection port 103 will make the injection time longer and the ejection port 103 is easy to be blocked by the suspended matter in the injection liquid (such as vaccine) during injection, which is not conducive to the stability of injection. At the same time, although smaller pore size is more conducive to forming intradermal stable injection, due to the limitation of process, the pore size cannot be infinitely small.

[0047] In addition, the ejection port of the injection tube can be formed by laser drilling or injection molding. It is suitable for the formation of micropores of different sizes, and the design is reasonable, which can be widely promoted.

[0048] Reasons for selecting 0.13mm to 0.25mm pore size of the ejection hole.

[0049] 1. Adapt to different animal skin characteristics

[0050] Wide applicability: In veterinary practice, a wide variety of animals are involved, ranging from small pets (such as cats and dogs) to large livestock (such as cows and horses), with significant differences in skin thickness and structure. The 0.13mm to 0.25mm pore size range can better adapt to this diversity. For large animals with thicker skin, a larger pore size helps to ensure sufficient penetration; while for small animals, a smaller pore size can be chosen to avoid excessive injection, ensuring accurate drug delivery to the target tissue layer.

[0051] Optimize injection depth: Different animals require different injection depths. Larger pore size can provide more flexibility to adjust injection pressure and depth, thereby optimizing drug distribution effect.

[0052] 2. Improved injection efficiency

[0053] Faster ejection: Compared to micro-hole designs (e.g., less than or equal to 0.12mm), a bore diameter of 0.13mm to 0.25mm can accelerate the drug ejection speed while ensuring a certain degree of precision, thereby shortening the time required for a single injection. This is particularly important for situations that require batch processing of a large number of animals, significantly improving work efficiency.

[0054] Reduced risk of clogging: Larger bore diameters reduce the likelihood of ejection hole clogging caused by suspended particles or other impurities in the drug, especially when using complex liquids such as vaccines. This not only improves the reliability of the device but also reduces maintenance costs and downtime.

[0055] 3. Manufacturing process and cost control

[0056] Production convenience: A bore diameter of 0.13mm to 0.25mm is within the range of existing mature production processes and controllable technology, whether it is laser drilling or injection molding, can maintain a high yield rate and quality stability. This is conducive to large-scale production and cost reduction.

[0057] Easy to clean and maintain: Compared to smaller bore diameter designs, this size is easier to clean and maintain, less likely to leave residual drugs, reducing the risk of cross-contamination, and facilitating daily inspections and maintenance.

[0058] 4. Clinical verification and practical application

[0059] Data support: According to previous research and experimental data (see Table 1 to Table 4 in the Background Art cited patent documents), existing needle-free injectors have already shown good injection performance when the ejection hole diameter is around 0.16mm. Expanding the diameter to the range of 0.13mm to 0.25mm, to some extent, inherits these advantages while further expanding the application range and technical potential.

[0060] Feasibility of field operation: Veterinary field conditions are often complex and variable, and a bore diameter of 0.13mm to 0.25mm can better cope with these challenges and provide stable and reliable injection effects. For example, in farm or field conditions, a larger bore diameter can reduce the impact of environmental factors and ensure the success rate of each injection.

[0061] 5. Balancing injection effect and safety

[0062] Avoiding excessive penetration: While larger orifice diameters help improve injection efficiency, excessively large orifice diameters can lead to excessive penetration of the drug into subcutaneous tissue, affecting treatment effectiveness. The range of 0.13mm to 0.25mm can effectively control the diffusion range of the drug while ensuring high-efficiency injection through reasonable pressurization technology (such as 10MPa to 26MPa), avoiding unnecessary side effects.

[0063] User experience: For veterinarians, ease of operation and success rate are crucial. The orifice diameter design in this range can provide better operation feel and visual feedback, enhancing user confidence and satisfaction.

[0064] When the diameter of the injection port is 0.13-0.25mm, and the injection liquid is pressurized to 10MPa to 26MPa to achieve stable injection of the injection liquid into the epidermis and dermis layers of the skin. The injection level is intradermal, and the injection completion rate is in a very high range (i.e., approximately in the range of 85% to 98%), so it can be concluded that the needle-free injector with a diameter of 0.13-0.25mm and the injection liquid pressurized to 10MPa to 26MPa can achieve reliable and stable intradermal injection. On this basis, further control the stagnation pressure inside the drug tube in the appropriate range (i.e., between 10MPa and 26MPa), so as to achieve reliable and stable intradermal injection.

[0065] In summary, the choice of 0.13mm to 0.25mm as the diameter of the injection port 103 of the new generation of needle-free injectors for veterinary guns is the result of careful consideration. This choice not only takes into account the diversity and efficiency requirements in practical applications, but also considers the feasibility of manufacturing processes and the reliability of long-term use, aiming to bring more advanced and practical solutions to the veterinary field.

[0066] It is important to note that the construction and arrangements of the application shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications can be made to the embodiments without departing from the novel teachings and advantages of the subject matter described herein. For example, elements described as integrated in a single unit can be separated, elements described as separate can be integrated, and the position, number, shape, and arrangements of elements can be varied. Accordingly, all such modifications are intended to be included within the scope of the present inventive subject matter. The order or sequence of any process or method steps can be varied or re-sequenced without departing from the general nature of the claims. Any "means plus function" clauses are intended to cover the structures described herein as performing the recited functionality and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions can be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present inventive subject matter. Accordingly, the present inventive subject matter is not limited to the particular embodiments described and illustrated herein, but extends to equivalents of which the foregoing describes are intended to cover.

[0067] Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (i.e., those pertaining to the

[0068] It is understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts can inevitably lead to a number of substitutions, modifications, changes, and omissions of parts illustrated as having a specific configuration. Such are the natural consequences of research and development efforts, and

[0069] It should be noted that the above examples are intended to illustrate the technical solutions of the present application but not limit the present application, and although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A microporous needleless injector characterized by: The utility model relates to a kind of injection device, including pipeline part (101) and nozzle part (102), wherein the nozzle part (102) is gradually tapered along the liquid emission direction inner diameter until the emission port (103), the diameter of the emission port (103) is 0.13-0.25mm, and the injection pressure is between 10MPa and 26MPa; Drive component (200) provides power to pressurized injection of liquid during the whole injection process, which includes pneumatic part (201) connected to the outside world for power, trigger part (202) for controlling the pneumatic part (201), and adjusting part (203) for accurately controlling the dose of each injection. The nozzle part (102) is screwed at one end of the pipeline part (101), and the nozzle part (102) is divided into a first segment (102a) screwed with the pipeline part (101), a second segment (102b) conical on one side of the first segment (102a), and the tip of the second segment (102b) is the emission port (103). A cap is also provided on the outside of the nozzle part (102).

2. The microporous needle-free injector of claim 1, wherein: The pipeline part (101) includes a main pipe body (101a) screwed with the drive component (200), a branch pipe body (101b) provided on one side of the main pipe body (101a), a one-way valve (101c) mounted on the branch pipe body (101b), and a container for containing liquid mounted above the one-way valve (101c).

3. The microporous needle-free injector of claim 2, wherein: The pneumatic part (201) is provided as a gun-shaped housing (201a), with a transverse gas chamber (204a) and a longitudinal gas chamber (204b) provided inside the gun-shaped housing (201a). The transverse gas chamber (204a) and the longitudinal gas chamber (204b) are communicated through a communication air channel (204c) and a balance air channel (204d), and an air inlet (204e) is provided at the bottom of the longitudinal gas chamber (204b).

4. The microporous needle-free injector of claim 2 or 3, wherein: A piston piece (201b), a pneumatic balancing piece (201c), and a propelling body (201d) are provided in the transverse gas chamber (204a). The piston piece (201b) is driven by high-pressure gas to push the propelling body (201d) to emit the liquid in the pipeline part (101) from the nozzle part (102). The pneumatic balancing piece (201c) is used for resetting the piston piece (201b) and discharging high-pressure gas after work.

5. The microporous needle-free injector of claim 4, wherein: The adjusting part (203) is provided at the transverse end of the gun-shaped housing (201a), which includes a shell (203a), an axle body (203b), and a drive cap (203c) mounted inside the shell (203a). The axle body (203b) is used to push the movement of the piston piece (201b), and the drive cap (203c) is used to drive the movement of the axle body (203b).

6. The microporous needle-free injector of claim 5, wherein: ​ 7. The microporous needle-free injector of claim 5 or 6, wherein: The trigger part (202) is arranged at the transverse longitudinal intersection of the gun-shaped shell (201a), which comprises a safety catch (202a) and a trigger (202b), the safety catch (202a) is used to form structural protection for the trigger (202b) to prevent accidental operation, and the trigger (202b) is used to control high-pressure gas, control the pneumatic process and provide trigger power for the injection process.

8. The microporous needle-free injector of claim 5 or 6, wherein: The piston part (201b) comprises a piston body (201b-1) and a spring I (201b-2) arranged on one side of the piston body (201b-1), which is used to push the piston body (201b-1) to reset, and the pneumatic balance part (201c) comprises a moving block (201c-1) provided with a spring II (201c-2) on one side of the moving block (201c-1).

9. The microporous, needleless injector of claim 8, wherein: The moving block (201c-1) is connected with the piston body (201b-1), one end of the propelling body (201d) is located in the piston body (201b-1), and the other end is located at the end of the pipeline part (101).

10. The microporous, needleless injector of claim 7, wherein: The trigger (202b) comprises a pressing block (202b-1) and a push rod (202b-2) located on the inner side of the pressing block (202b-1), one end of the push rod (202b-2) is inserted into the airway, and the push rod (202b-2) is provided with a spring III (202b-3) for resetting.

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