Needleless injection device
By designing a detachable needle-free injection device, the injection head and the drug delivery component can be detachably connected. The drug delivery component is driven by a drive assembly to change its volume, which solves the problem of high operating costs of needle-free injection devices and achieves prevention of cross-contamination of drug solutions and cost savings.
Patent Information
- Application Number
- CN202422952679.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Traditional needle-free injection devices are more expensive to use than traditional syringes with needles, and are disposable medical devices, which increases the overall cost of use.
Design a needle-free injection device that allows the injection head and the drug pusher to be detachably connected. The drug pusher is driven by a drive assembly to move within the drug storage chamber, changing the volume to achieve drug aspiration and injection functions. The drug pusher and injection head are replaceable as consumables, avoiding cross-contamination of the drug solution and saving costs.
The detachable design avoids cross-contamination of medications, reduces operating costs, and allows for the replacement of the medication pusher and injection head, saving on overall device replacement costs.
Smart Images
Figure CN223682872U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of needle-free injection, in particular to a needle-free injection device. BACKGROUND
[0002] A traditional drug injection method is to use a syringe with a sharp needle to inject liquid medicine. The traditional syringe needs to pierce the skin with a needle, which causes pain and discomfort to the patient. Therefore, in related technologies, a needle-free injection scheme is proposed for insulin, growth hormone, vaccine, etc. Needle-free injection does not need to pierce the skin of the human body with a needle, but applies high pressure to liquid medicine, uses the instantaneous high pressure generated by a power source to make the medicine in the syringe form a high-speed, high-pressure jet through a nozzle, so as to inject the medicine into the patient's subcutaneous tissue through the micropore at the end, so as to make the medicine penetrate the outer layer of the skin to the subcutaneous tissue, intradermal tissue, etc. to release the drug effect.
[0003] However, in order to avoid cross contamination of the medicine, the traditional needle-free injection device is a disposable medical instrument, and the production cost of the needle-free injection device is generally higher than that of the traditional syringe with a needle, resulting in an increase in the use cost of the needle-free injection device. CONTENT OF THE INVENTION
[0004] The present application provides a needle-free injection device to improve the technical problem of increased use cost of the needle-free injection device.
[0005] The present application provides a needle-free injection device, which comprises:
[0006] A main shell is provided with a movable cavity;
[0007] An injection head is detachably connected to one end of the main shell, the injection head is provided with a medicine storage cavity inside, the medicine storage cavity is in communication with the movable cavity, and an injection micropore is opened at one end of the injection head away from the main shell, the injection micropore is in communication with the medicine storage cavity;
[0008] A medicine pushing member is detachably arranged in the medicine storage cavity;
[0009] A driving assembly is connected with the medicine pushing member and moves in the movable cavity to push the medicine pushing member to change the volume of the medicine storage cavity.
[0010] In some embodiments of the present application, an activity through slot is opened on the surface of the main shell, the activity through slot is in communication with the movable cavity and extends along the length direction of the movable cavity;
[0011] The driving assembly comprises a driving member, a driving spring and a fixing cap, the driving member and the driving spring are arranged in the movable cavity, and a part of the driving member extends to outside of the main shell through the movable slot, the fixing cap is fixed to one end of the main shell away from the injection head, and two ends of the driving spring are connected to one side of the fixing cap towards the movable cavity and one side of the driving member away from the medicine pushing member respectively.
[0012] In some embodiments of the present application, a plurality of limiting grooves are further arranged on the surface of the main shell, the limiting grooves are arranged at intervals along the length direction of the main shell, and the limiting grooves are in communication with the movable slot and the movable cavity.
[0013] The driving member can rotate in the movable cavity, the driving member comprises a driving part and a limiting part, the limiting part is connected to the side surface of the driving part, and the limiting part extends to outside of the main shell through the movable cavity, the limiting part can be screwed into or out of the limiting groove, and one end of the driving spring away from the fixing cap is connected to the driving part.
[0014] In some embodiments of the present application, two movable slots are arranged, a plurality of limiting grooves are in communication with each movable slot, the two movable slots are symmetrically arranged, the plurality of limiting grooves in communication with one movable slot correspond to the plurality of limiting grooves in communication with the other movable slot one by one, and the limiting grooves in communication with one movable slot are symmetrically arranged with the limiting grooves in communication with the other movable slot; the limiting part comprises two limiting parts, the two limiting parts are arranged on the side surface of the driving part, and the two limiting parts are symmetrically arranged with the center line of the driving part as the axis.
[0015] In some embodiments of the present application, a fixing groove is arranged on one side of the driving part towards the fixing cap, and one end of the driving spring is arranged in the fixing groove.
[0016] In some embodiments of the present application, two first clamping blocks are symmetrically arranged on the inner side of the fixing cap covering the main shell; two first L-shaped slots are arranged on one end of the main shell away from the driving member, the two first L-shaped slots are symmetrically arranged with the center axis of the main shell as the axis of symmetry, and the first clamping blocks are clamped with the first L-shaped slots.
[0017] In some embodiments of the present application, two second L-shaped slots are arranged on one end of the main shell towards the injection head.
[0018] Two second clamping blocks are arranged on one end of the injection head away from the injection micro-holes, and the two second clamping blocks are symmetrically arranged with the center axis of the main shell as the axis of symmetry.
[0019] The second clamping blocks are clamped with the second L-shaped slots.
[0020] In some embodiments of the present application, a positioning hole is formed on the surface of the main shell, and a positioning mark is arranged on the surface of the injection head; when the second clamping block is clamped with the second L-shaped slot, the positioning mark is exposed to the positioning hole.
[0021] In some embodiments of the present application, a plurality of pressure relief holes are formed on the end of the injection head away from the medicine pushing member.
[0022] In some embodiments of the present application, the main shell and the injection head are threadedly connected.
[0023] Therefore, the injection head and the medicine pushing member are arranged in a detachable manner, so that the needle-free injection device can be replaced by detaching the injection head and the medicine pushing member after use, thereby avoiding cross contamination of the medicine liquid, allowing the needle-free injection device to continue to be used, and saving the use cost. In detail, the medicine pushing member is driven to move in the medicine storage cavity by the driving member, so as to change the space volume in the medicine storage cavity, thereby realizing the functions of medicine suction and injection. During the process of medicine suction and injection, only the medicine pushing member and the injection head are in contact with the medicine liquid. Therefore, after the medicine injection is completed, the injection head and the medicine pushing member are replaced as consumables by virtue of the detachable arrangement of the injection head and the medicine pushing member, and the entire needle-free injection device does not need to be replaced, which is beneficial to saving the cost. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0025] Figure 1 A structure schematic diagram of a needle-free injection device provided by the embodiments of the present application is shown in the figure.
[0026] Figure 2 An exploded schematic diagram of the needle-free injection device is shown in the figure. Figure 1
[0027] Figure 3 A structure schematic diagram of a main shell in a needle-free injection device provided by the embodiments of the present application is shown in the figure (first perspective view).
[0028] Figure 4 A structure schematic diagram of a main shell in a needle-free injection device provided by the embodiments of the present application is shown in the figure (second perspective view).
[0029] Figure 5 A structure diagram of an injection head in a needleless injection device provided by an embodiment of the present application;
[0030] Figure 6 A structure diagram of a driving member in a needleless injection device provided by an embodiment of the present application;
[0031] Figure 7 A structure diagram of a fixing cap in a needleless injection device provided by an embodiment of the present application;
[0032] Figure 8 A structure diagram of another needleless injection device provided by an embodiment of the present application;
[0033] Figure 9 An explosion diagram of Figure 8 .
[0034] Explanation of reference signs:
[0035] 1, main shell; 11, movable cavity; 12, movable through slot; 13, limiting slot; 14, first L-shaped through slot; 15, second L-shaped through slot; 16, positioning hole; 2, injection head; 21, medicine storage cavity; 22, injection micropore; 23, second clamping block; 24, pressure relief hole; 3, medicine pushing member; 4, driving assembly; 41, push rod; 42, driving member; 421, driving part; 4211, fixing groove; 422, limiting part; 43, fixing cap; 431, first clamping block. DETAILED DESCRIPTION
[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.
[0037] In the description of the present application, it should be understood that the words "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0038] Please refer to Figure 1 and Figure 2 or Figure 8 and Figure 9 The embodiment of the present application provides a needleless injection device, which comprises a main shell 1, an injection head 2, a medicine pushing member 3 and a driving assembly 4.
[0039] The main shell 1 is provided with a movable cavity 11. The injection head 2 is detachably connected to one end of the main shell 1, and the injection head 2 is provided with a medicine storage cavity 21, which is in communication with the movable cavity 11. An injection micro-hole 22 is formed at the end of the injection head 2 away from the main shell 1, and the injection micro-hole 22 is in communication with the medicine storage cavity 21. The medicine pushing member 3 is detachably arranged in the medicine storage cavity 21. The driving assembly 4 is connected with the medicine pushing member 3 and moves in the movable cavity 11 to push the medicine pushing member 3 to change the volume of the medicine storage cavity 21.
[0040] It should be noted that the injection micro-hole 22 refers to the diameter of the hole of the injection head 2 used for injecting liquid, which is 0.5 to 1.5 mm. The diameter of the injection micro-hole 22 is not greater than one tenth of the diameter of the medicine storage cavity 21, so as to ensure that the injection micro-hole 22 can compress the liquid medicine and make the liquid medicine be injected at high pressure and high speed.
[0041] The technical scheme provided in the present application sets the injection head 2 and the medicine pushing member 3 in a detachable mounting mode, so that after use, the needle-free injection device can be replaced by detaching the injection head 2 and the medicine pushing member 3, thereby avoiding cross contamination of the liquid medicine and enabling the needle-free injection device to continue to be used without being discarded as a whole, thereby saving use cost. In detail, the driving member 42 drives the medicine pushing member 3 to move in the medicine storage cavity 21 to change the space volume in the medicine storage cavity 21, thereby realizing the functions of medicine suction and injection. During the process of medicine suction and injection, only the medicine pushing member 3 and the injection head 2 are in contact with the liquid medicine. Therefore, after the medicine injection is completed, the injection head 2 and the medicine pushing member 3 are replaced as consumables by virtue of the detachable setting of the injection head 2 and the medicine pushing member 3, without replacing the entire needle-free injection device, which is beneficial to cost saving.
[0042] Please refer to Figure 8 and Figure 9In some embodiments, one end of the main housing 1 is threadedly connected with the injection head 2, and the other end is inserted into the driving assembly 4 which can make piston movement in the movable cavity 11. The medicine storage cavity 21 of the injection head 2 is provided with a medicine pushing member 3, and the medicine storage cavity 21 and the medicine pushing member 3 are both cylindrical and fit with each other. The medicine pushing member 3 can make piston movement in the medicine storage cavity 21 to change the volume of the medicine storage cavity 21, so as to suck the external liquid medicine into the medicine storage cavity 21 or extrude the liquid medicine in the medicine storage cavity 21 at high pressure and high speed. The piston movement of the medicine pushing member 3 is realized by the driving assembly 4. The end of the driving assembly 4 away from the medicine pushing member 3 is located outside the movable cavity 11. The user pulls out the driving assembly 4, and the driving assembly 4 is connected with the medicine pushing member 3, so as to drive the medicine pushing member 3 to move away from the injection head 2, thereby increasing the space in the medicine storage cavity 21, and the liquid medicine is sucked into the medicine storage cavity 21 under the action of external air pressure. The user presses the driving assembly 4, and the driving assembly 4 drives the medicine pushing member 3 to extrude the liquid medicine in the medicine storage cavity 21, so as to shoot the liquid medicine at high speed and high pressure.
[0043] In this embodiment, the driving assembly 4 is a push rod 41 which can be directly pulled out of the movable cavity 11 to facilitate disassembly and replacement of the push rod 41. It should be noted that the outer periphery of the end of the push rod 41 towards the medicine pushing member 3 is provided with a sealing ring, so that the sealing ring can be attached to the inner wall of the movable cavity 11 to prevent poor medicine sucking and pushing effect. The injection head 2 is threadedly connected with the main housing 1 to facilitate disassembly and replacement of the injection head 2. The medicine pushing member 3 is movably arranged in the medicine storage cavity 21, and it can be pulled out of the movable cavity 11 together with the push rod 41, or it can be taken out separately after the injection head 2 is removed. By modularizing the injection head 2, the main housing 1, the push rod 41 and the medicine pushing member 3, each component can be independently produced and disassembled, effectively avoiding cross contamination of the liquid medicine and enabling multiple use of parts of the needle-free injection device, such as the driving assembly 4 and the main housing 1, thereby saving costs.
[0044] Further, a plurality of pressure relief holes 24 are formed at the end of the injection head 2 away from the medicine pushing member 3 to avoid the process of injecting liquid medicine being not smooth due to air pressure.
[0045] See Figures 1 to 6 In some embodiments, an active through slot 12 is formed on the surface of the main housing 1, which is in communication with the movable cavity 11 and extends along the length direction of the movable cavity 11.
[0046] See Figure 6The driving assembly 4 comprises a driving member 42, a driving spring (not shown in the figure) and a fixing cap 43. The driving member 42 and the driving spring are arranged in the movable cavity 11, and a part of the driving member 42 extends to the outside of the main shell 1 through the movable through slot 12, so that the user can touch the driving member 42 from the outside of the main shell 1 and drive the driving member 42 to move in the length direction of the main shell 1. The fixing cap 43 is fixed to the end of the main shell 1 away from the injection head 2, and the two ends of the driving spring are connected to the side of the fixing cap 43 towards the movable cavity 11 and the side of the driving member 42 away from the medicine pushing member 3, respectively. By driving the driving member 42 to move in the movable cavity 11, the driving spring is extruded or stretched by the driving member 42. When the driving spring changes from the natural state to the stretched state, the driving member 42 drives the medicine pushing member 3 to move towards the fixing cap 43, so that the volume of the medicine storage cavity 21 increases, thereby playing a role of medicine suction. When the driving spring changes from the stretched state to the natural state, this process only needs the user to cancel the force acting on the driving member 42, and the elastic potential energy of the driving spring is converted into the kinetic energy of the driving member 42, and the kinetic energy is transmitted to the medicine pushing member 3, so that the medicine pushing member 3 can instantaneously compress the medicine storage cavity 21, and the liquid medicine in the medicine storage cavity 21 is shot from the injection micro-hole 22 at high speed and high pressure. The whole process mainly utilizes the elastic potential energy of the driving spring, compared with driving the driving member 42 by human force to compress the medicine storage cavity 21, it is more labor-saving, and the instantaneous pressure is larger, which is more conducive to improving the pressure and speed of liquid medicine injection.
[0047] Further, please refer to Figure 3 The surface of the main shell 1 is provided with a plurality of limiting grooves 13. The plurality of limiting grooves 13 are arranged at intervals along the length direction of the main shell 1, and the limiting grooves 13 are in communication with the movable through slot 12 and the movable cavity 11. The driving member 42 can rotate in the movable cavity 11. The driving member 42 comprises a driving part 421 and a limiting part 422. The limiting part 422 is connected to the side surface of the driving part 421, and the limiting part 422 extends to the outside of the main shell 1 through the movable cavity 11. The limiting part 422 can be screwed into or out of the limiting groove 13. The end of the driving spring away from the fixing cap 43 is connected to the driving part 421.
[0048] The user holds the limiting part 422 to rotate the driving assembly 4, and rotates the limiting part 422 into the limiting groove 13 to fix the position of the driving part 42. Even if the human force is removed at this time, the driving part 42 will not move towards the injection head 2 under the action of the driving spring. When the injection of the liquid medicine is needed, the user only needs to pull the limiting part 422 to rotate the limiting part 422 out of the limiting groove 13, so that the driving spring drives the driving part 42, the driving part 42 drives the medicine pushing part 3 to quickly extrude the medicine storage cavity 21, and the high-speed injection of the liquid medicine is realized. In addition, a plurality of limiting grooves 13 are arranged along the length direction of the main shell 1, and the user can fix the driving part 42 by selecting different limiting grooves 13, and then select the medicine suction amount and the injection pressure and speed of the liquid medicine. The plurality of limiting grooves 13 in the embodiment correspond to the gear positions of the medicine suction and injection.
[0049] In some embodiments, the movable through groove 12 is provided with two. Each movable through groove 12 is communicated with a plurality of limiting grooves 13, and the two movable through grooves 12 are symmetrically arranged, and the plurality of limiting grooves 13 communicated with one movable through groove 12 correspond to the plurality of limiting grooves 13 communicated with the other movable through groove 12 one by one. And the limiting grooves 13 communicated with one movable through groove 12 and the limiting grooves 13 communicated with the other movable through groove 12 are centrally symmetric. The limiting part 422 includes two, and the two limiting parts 422 are arranged on the side surface of the driving part 421, and the two limiting parts 422 are centrally symmetric with the center line of the driving part 421 as the axis. By arranging the movable through groove 12 and the limiting part 422 as two, and symmetrically arranging the movable through groove 12 and the limiting part 422, the movement of the driving part 42 in the movable cavity 11 is balanced.
[0050] In some embodiments, the driving part 421 is provided with a fixing groove 4211 on the side facing the fixed cap 43, and one end of the driving spring is arranged in the fixing groove 4211, so that the driving spring is fixed more stably, and the spring is prevented from being distorted in the stretching or compression process.
[0051] In some embodiments, the inner side of the fixed cap 43 covering the main shell 1 is symmetrically provided with two first clamping blocks 431; the end of the main shell 1 away from the driving member 42 is provided with two first L-shaped through grooves 14, the two first L-shaped through grooves 14 are centrally symmetric with the central axis of the main shell 1 as the axis of symmetry, and the first clamping blocks 431 are clamped with the first L-shaped through grooves 14. By clamping the first clamping blocks 431 into the first L-shaped through grooves 14, the detachable fixing of the fixed cap 43 and the main shell 1 is realized. The specific operation process is as follows: the user covers the fixed cap 43 on the main shell 1, when covering, the two first clamping blocks 431 correspond to the two first L-shaped through grooves 14 respectively, so that the first clamping blocks 431 enter into the vertical grooves of the first L-shaped through grooves 14, and then the fixed cap 43 is rotated to clamp the first clamping blocks 431 into the horizontal grooves of the first L-shaped through grooves 14. When it is necessary to disassemble the fixed cap 43, it is only necessary to rotate the fixed cap 43, and then pull out the first clamping blocks 431 of the fixed cap 43 from the first L-shaped through grooves 14.
[0052] In some embodiments, please refer to Figure 3 , the end of the main shell 1 towards the injection head 2 is provided with two second L-shaped through grooves 15. The end of the injection head 2 away from the injection micropore 22 is provided with two second clamping blocks 23, and the two second clamping blocks 23 are symmetrically arranged with the central axis of the main shell 1 as the axis of symmetry. The second clamping blocks 23 are clamped with the second L-shaped through grooves 15. The disassembly and assembly of the main shell 1 and the injection head 2 are similar to those of the fixed cap 43 and the main shell 1. Specifically, the user aligns the second clamping blocks 23 with the second L-shaped through grooves 15, inserts the second clamping blocks 23 into the second L-shaped through grooves 15, and then rotates the injection head 2 to clamp the second clamping blocks 23 into the second L-shaped through grooves 15, thereby completing the fixing of the injection head 2 and the main shell 1. When disassembling, the user only needs to rotate the injection head 2 to rotate the second clamping blocks 23 out of the horizontal grooves of the second L-shaped through grooves 15, and then pull them out from the vertical grooves. The disassembly and assembly of the injection head 2 do not require the aid of other tools, which is convenient and fast. After the needle-free injection device is used, the injection head 2 can be quickly disassembled, and a new injection head 2 can be replaced, which effectively avoids cross contamination of the liquid medicine and is conducive to cost saving.
[0053] Further, the surface of the main shell 1 is provided with a positioning hole 16. The surface of the injection head 2 is provided with a positioning mark. When the second clamping blocks 23 are clamped with the second L-shaped through grooves 15, the positioning mark is exposed to the positioning hole 16. By providing the positioning hole 16 and the positioning mark, when the user clamps the second clamping blocks 23 into the second L-shaped through grooves 15, the position of the positioning hole 16 and the positioning mark can be observed to determine whether the second clamping blocks 23 are clamped with the second L-shaped through grooves 15 in place, thereby playing a role in detecting positioning.
[0054] Having now described the basic concept of the application, and having shown and described several embodiments of the same, modifications, improvements and variations thereto which, as would be apparent to one skilled in the art, are
[0055] application. As such, it should be noted that a variety of "embodiments" as referred to herein, do not necessarily have to be the same "embodiment." Furthermore, certain features, structures, or characteristics of an embodiment can be combined in alternate embodiments with features, structures or characteristics of other embodiments. Like reference numerals refer to components throughout the several views of the drawings.
[0056] application. As such, it should be noted that a variety of "embodiments" as referred to herein, do not necessarily have to be the same "embodiment." Furthermore, certain features, structures, or characteristics of an embodiment can be combined in alternate embodiments with features, structures or characteristics of other embodiments. Like reference numerals refer to components throughout the several views of the drawings.
[0057] application. As such, it should be noted that a variety of "embodiments" as referred to herein, do not necessarily have to be the same "embodiment." Furthermore, certain features, structures, or characteristics of an embodiment can be combined in alternate embodiments with features, structures or characteristics of other embodiments. Like reference numerals refer to components throughout the several views of the drawings.
[0058] application. As such, it should be noted that a variety of "embodiments" as referred to herein, do not necessarily have to be the same "embodiment." Furthermore, certain features, structures, or characteristics of an embodiment can be combined in alternate embodiments with features, structures or characteristics of other embodiments. Like reference numerals refer to components throughout the several views of the drawings.
Claims
1. A needle-free injection device, characterized in that, The utility model provides an injection device, including: A main shell is provided with a movable cavity; An injection head is detachably connected to one end of the main shell, the injection head is provided with a medicine storage cavity inside, the medicine storage cavity is communicated with the movable cavity, and an injection micropore is formed in the end of the injection head away from the main shell, and the injection micropore is communicated with the medicine storage cavity; A medicine pushing member is detachably arranged in the medicine storage cavity; A driving assembly is connected with the medicine pushing member and moves in the movable cavity to push the medicine pushing member to change the volume of the medicine storage cavity.
2. The needle-free injection device of claim 1, wherein, An active channel is formed in the surface of the main shell, the active channel is communicated with the movable cavity and extends along the length direction of the movable cavity; The driving assembly includes a driving member, a driving spring and a fixed cap, the driving member and the driving spring are arranged in the movable cavity, and a part of the driving member extends to the outside of the main shell through the active channel, the fixed cap is fixed to the end of the main shell away from the injection head, and the two ends of the driving spring are respectively connected to the side of the fixed cap towards the movable cavity and the side of the driving member away from the medicine pushing member.
3. The needle-free injection device of claim 2, wherein, The surface of the main shell is also provided with a plurality of limiting grooves, and the plurality of limiting grooves are arranged at intervals along the length direction of the main shell and are communicated with the active channel and the movable cavity; The driving member can rotate in the movable cavity, the driving member includes a driving part and a limiting part, the limiting part is connected to the side surface of the driving part, and the limiting part extends to the outside of the main shell through the movable cavity, the limiting part can be screwed into or out of the limiting groove, and the end of the driving spring away from the fixed cap is connected with the driving part.
4. The needle-free injection device of claim 3, wherein, The active channel is formed with two, each active channel is communicated with a plurality of limiting grooves, the two active channels are symmetrically arranged, the plurality of limiting grooves communicated with one active channel correspond to the plurality of limiting grooves communicated with the other active channel one by one, and the limiting grooves communicated with one active channel are centrally symmetric with the limiting grooves communicated with the other active channel; the limiting part includes two, the two limiting parts are arranged on the side surface of the driving part, and the two limiting parts are centrally symmetric with the center line of the driving part as the axis.
5. The needle-free injection device of claim 3, wherein, The side of the driving part towards the fixed cap is provided with a fixed groove, and one end of the driving spring is arranged in the fixed groove.
6. The needle-free injection device of any one of claims 2 to 5, wherein, The fixed cap covers the inside of the main shell and is symmetrically provided with two first clamping blocks; the end of the main shell away from the driving member is provided with two first L-shaped through grooves, the two first L-shaped through grooves are centrally symmetric with the central axis of the main shell as the symmetric axis, and the first clamping blocks are clamped with the first L-shaped through grooves.
7. The needle-free injection device of any one of claims 1 to 5, wherein, The end of the main shell towards the injection head is provided with two second L-shaped through grooves; The end of the injection head away from the injection micropore is provided with two second clamping blocks, and the two second clamping blocks are symmetrically arranged with the central axis of the main shell as the symmetric axis; The second clamping blocks are clamped with the second L-shaped through grooves.
8. The needle-free injection device of claim 7, wherein, The surface of the main shell is provided with a positioning hole, and the surface of the injection head is provided with a positioning mark; when the second clamping blocks are clamped with the second L-shaped through grooves, the positioning mark is exposed to the positioning hole.
9. The needle-free injection device of any one of claims 1 to 5, wherein, A plurality of pressure relief holes are arranged on the end of the injection head away from the medicine pushing member.
10. The needle-free injection device of claim 1, wherein, The main shell is threadedly connected with the injection head.