Needleless injection device

Abstract

The embodiment of the invention discloses a needleless injection device, and relates to the technical field of needleless injection. The needleless injection device comprises a shell, an injection head, a multi-stage transmission mechanism and an energy storage liquid pushing mechanism. The injection head is provided with an injection micropore and a medicine storage cavity, and the injection micropore is communicated with the medicine storage cavity. The energy storage liquid pushing mechanism comprises a push rod and an energy storage spring, one end of the push rod is connected with the multi-stage transmission mechanism, the other end of the push rod is slidably connected with the inner wall of the shell, and the energy storage spring is located in the shell and sleeves the push rod; the needleless injection device has an injection state and a medicine suction state, when the needleless injection device is in the medicine suction state, the push rod is connected with the multi-stage transmission device, the energy storage spring is in a compressed state, and the push rod is far away from the medicine storage cavity; when the needleless injection device is in an injection state, the multi-stage transmission device releases the push rod, the energy storage spring pushes the push rod to enter the medicine storage cavity, and the push rod compresses the space of the medicine storage cavity so that medicine liquid in the medicine storage cavity can be ejected out of the injection micro hole. The manufacturing cost can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of needle-free injection, and in particular to a needle-free injection device. Background Art

[0002] The traditional way of drug injection is to use a syringe with a sharp needle, pierce the needle into the skin, and then inject the liquid medicine. The traditional syringe will cause pain and discomfort to the patient because the needle needs to pierce the skin. For this reason, in the relevant technology, a solution of needle-free injection of insulin, growth hormone, vaccines, etc. is proposed. Needle-free injection does not require the needle to pierce the human skin. Instead, it applies high pressure to the liquid medicine and uses the instantaneous high pressure generated by the power source to form a high-speed, high-pressure jet flow through the nozzle of the medicine in the syringe, so that it can be injected into the patient's subcutaneous tissue through the micropores at the end, so that the medicine can penetrate the outer layer of the skin to the subcutaneous, intradermal and other tissue layers to release its efficacy.

[0003] Because needle-free injection requires a lot of power, it is necessary to ensure that the liquid medicine forms a high-speed jet flow under high pressure. Therefore, needle-free injectors in related technologies generally use electric or pneumatic power sources, such as air pumps, motors, etc., which is not conducive to reducing the manufacturing cost of needle-free injection. Summary of the invention

[0004] The embodiment of the present application provides a needle-free injection device, which can reduce the manufacturing cost while ensuring that the needle-free injection device meets the power required for injection.

[0005] In a first aspect, an embodiment of the present application provides a needle-free injection device, the needle-free injection device comprising:

[0006] The housing is provided with a first accommodating chamber, a second accommodating chamber and a third accommodating chamber;

[0007] An injection head connected to the housing and a portion of the injection head is located in the third accommodating cavity, the injection head is provided with an injection micropore and a drug storage cavity, and the injection micropore is communicated with the drug storage cavity;

[0008] A multi-stage transmission mechanism, disposed in the first accommodating chamber and extending outside the housing;

[0009] An energy storage and fluid pushing mechanism is arranged in the second accommodating chamber and extends outside the second accommodating chamber, the energy storage and fluid pushing mechanism comprises a push rod and an energy storage spring, one end of the push rod is connected to the multi-stage transmission mechanism, and the other end is slidably connected to the inner wall of the shell, the energy storage spring is located in the second accommodating chamber and sleeved on the push rod;

[0010] In which, the needle-free injection device has an injection state and a drug absorption state. When the needle-free injection device is in the drug absorption state, the push rod is connected to the multi-stage transmission device and the energy storage spring is in a compressed state, and the push rod is away from the drug storage chamber; when the needle-free injection device is in the injection state, the multi-stage transmission device releases the push rod, the energy storage spring pushes the push rod into the drug storage chamber, and the push rod compresses the space of the drug storage chamber so that the drug liquid in the drug storage chamber is ejected from the injection micropore.

[0011] In some embodiments of the present application, the multi-stage transmission mechanism includes:

[0012] Press the head;

[0013] A bearing member, arranged opposite to the pressing head;

[0014] a primary transmission member connected to the pressing head and located between the bearing member and the pressing head, wherein the pressing head transmits linear motion to the primary transmission member;

[0015] a secondary transmission member, disposed between the primary transmission member and the bearing member, wherein the primary transmission member contacts the secondary transmission member and transmits linear motion to the secondary transmission member, and the secondary transmission member converts the linear motion into rotational motion;

[0016] A fixed release assembly is arranged on the support member and is slidably connected to the secondary transmission member on a side of the fixed release assembly facing away from the support member. The fixed release assembly has a fixed state and a released state. When the fixed release assembly is in the fixed state, the fixed release assembly is fixedly connected to the push rod. When the fixed release assembly is in the released state, the fixed release assembly has no contact with the push rod. The fixed release assembly can switch between the fixed state and the released state as the secondary transmission member rotates.

[0017] In some embodiments of the present application, the bearing member is provided with a bearing groove and a plurality of slide grooves, the bearing groove is circular, a first through hole for the push rod to pass through is provided at the center of the bearing groove, and the plurality of slide grooves are distributed in a circumferential array along the bearing groove and are all connected to the bearing groove;

[0018] The fixing and releasing assembly comprises a plurality of threaded members, the plurality of threaded members are arranged in an array along the circumference of the push rod, a portion of each threaded member away from the first through hole is slidably connected to a corresponding slide groove, and a side of the threaded member away from the slide groove is provided with a thread;

[0019] Among them, when the fixing and releasing assembly is in the fixing state, the multiple threaded members are surrounded to form a circular ring, and the threads of the multiple threaded members are connected in sequence along the circumferential direction, and the push rod is threadedly connected with the multiple threaded members; when the fixing and releasing assembly is in the releasing state, the threaded member slides in the sliding groove in the direction away from the push rod, the multiple threaded members are separated, and the threaded member has no contact with the push rod.

[0020] In some embodiments of the present application, the threaded member includes an arc-shaped portion and a sliding portion, the arc-shaped portion is connected to the sliding portion, the sliding portion is slidably connected to the slide groove, a thread is provided on the side of the arc-shaped portion facing away from the sliding portion, the arc-shaped portions of the multiple threaded members are concentric and have the same radius, and the threads of the multiple threaded members are connected in sequence along the circumferential direction to form a thread that matches the thread on the push rod.

[0021] In some embodiments of the present application, the secondary transmission member includes an annular body and a plurality of guide blocks, the annular body is provided on the bearing member, the plurality of guide blocks are arranged in an array along the inner wall of the annular body, a second through hole and a plurality of guide through grooves are opened at the bottom of the annular body, the plurality of guide through grooves are arranged in an array around the second through hole, one end of the guide through groove is arranged close to the second through hole, and the other end of the guide through groove is arranged away from the second through hole;

[0022] The guide block is provided with a guide slope, which is inclined in the circumferential direction, and the side of the primary transmission member away from the pressing head contacts the guide slope. When the primary transmission member is pressed down, the side of the primary transmission member away from the pressing head slides along the guide slope to drive the secondary transmission member to rotate;

[0023] A sliding column is provided on the side of the sliding portion away from the supporting member, and the sliding column is arranged in the guide groove. When the fixed release assembly is in the fixed state, the sliding column is arranged on the side of the guide groove close to the second through hole. When the fixed release assembly is in the released state, the sliding column is arranged on the side of the guide groove away from the second through hole.

[0024] In some embodiments of the present application, a limit block is provided on one side of the guide block along the circumferential direction, and the limit block is located on a side of the guide slope close to the bottom of the annular body.

[0025] In some embodiments of the present application, the primary transmission member includes a transmission body and a plurality of pressure columns, one side of the transmission body is in contact with the pressing head, the pressure columns are connected to a side of the transmission body away from the pressing head, and one of the pressure columns is in contact with a guide slope of the guide block.

[0026] In some embodiments of the present application, the surface of the pressure column in contact with the guiding inclined surface is a curved surface.

[0027] In some embodiments of the present application, the multi-stage transmission mechanism also includes a main reset member, which is arranged on the annular body, and the outer edge of the main reset member is tangent to the guide block and has elastic properties. When the fixed release assembly is in the fixed state, the outer edge of the main reset member remains in a natural state, and when the fixed release assembly is in the released state, the outer edge of the main reset member is squeezed by the guide block and is in a deformed state.

[0028] In some embodiments of the present application, the main reset member includes:

[0029] An annular main body portion, coaxially arranged with the second through hole;

[0030] A plurality of elastic arms, all connected to the annular main body and arranged in an array along the circumferential direction of the annular main body, wherein one end of each of the elastic arms away from the main body is tangent to one of the guide blocks;

[0031] When the fixing and releasing assembly is in the fixing state, the elastic arm maintains a natural state. When the fixing and releasing assembly is in the releasing state, the elastic arm is squeezed by the guide block and is in a deformed state.

[0032] In some embodiments of the present application, the multi-stage transmission mechanism further includes a secondary reset component, which is disposed on a side of the bearing member away from the pressing head and in contact with the primary transmission member;

[0033] The auxiliary reset assembly includes a pressure plate, a fixed plate and a reset spring, wherein the pressure plate is arranged opposite to the fixed plate, the pressure plate contacts the primary transmission member, the reset spring is arranged between the pressure plate and the fixed plate, and two ends of the reset spring abut against the pressure plate and the fixed plate respectively;

[0034] When the fixing release assembly is in the fixing state, the return spring maintains a natural state. When the fixing release assembly is in the releasing state, the return spring is squeezed by the fixing plate and the pressure plate and is in a deformed state.

[0035] In some embodiments of the present application, the push rod includes a rotating section and a fixed section, the rotating section and the fixed section are integrally formed, the rotating section and the fixed section are coaxially arranged and the projection area of ​​the rotating section along the axial direction is larger than the projection area of ​​the fixed section along the axial direction, the energy storage spring is sleeved on the fixed section, and one end of the energy storage spring abuts against the side of the fixed plate away from the pressure plate, the other end of the energy storage spring abuts against the rotating section, and one end of the fixed section away from the rotating section is threadedly connected to a threaded hole enclosed by a plurality of threaded members.

[0036] In some embodiments of the present application, the energy storage and fluid pushing mechanism further includes a rotating member, which is fixedly sleeved on the rotating section and exposed outside the shell.

[0037] In some embodiments of the present application, the inner wall of the rotating member is provided with a plurality of limit grooves, and the surface of the rotating section is provided with a plurality of limit strips, the limit strips are slidably arranged in the limit grooves, and the extension direction of the limit strips is perpendicular to the rotation direction of the rotating member.

[0038] In some embodiments of the present application, the energy storage and fluid pushing mechanism further includes an anti-slip sleeve, which is sleeved on the outer periphery of the rotating member.

[0039] In some embodiments of the present application, the shell includes a first sub-shell and a second sub-shell, the first sub-shell is provided with the first accommodating cavity and the second accommodating cavity, the second sub-shell is provided with the third accommodating cavity, the rotating member and the anti-slip sleeve are provided between the first sub-shell and the second sub-shell, and a reinforcement strip is connected between the first sub-shell and the second sub-shell.

[0040] In some embodiments of the present application, the rotating section is engraved with a medicine liquid scale and an energy storage gear, and the first sub-shell is provided with an observation window, and the medicine liquid scale and the energy storage gear pass through the observation window as the rotating section rotates.

[0041] In some embodiments of the present application, the injection head includes a drug storage section and an injection section, the drug storage section is connected to the injection section and the drug storage section is located between the rotating member and the injection section, the injection section is provided with a positioning groove, the bottom of the positioning groove is provided with the injection micropore, the circumferential surface of the injection section is provided with a plurality of pressure relief holes, the pressure relief holes are connected to the positioning groove, and the diameter of the pressure relief holes is larger than the diameter of the injection micropore.

[0042] It can be seen from this that the embodiment of the present application mainly realizes the mechanical liquid pushing of the energy storage liquid pushing mechanism through the cooperation of a multi-stage transmission mechanism and an energy storage liquid pushing mechanism, and utilizes the elastic potential energy of the energy storage spring and the push rod's own gravity to ensure that the force of the push rod on the medicine liquid is sufficient to make the medicine liquid ejected from the injection micropore at high speed, thereby completing the needle-free injection of the medicine liquid, and the entire process only relies on mechanical transmission and energy conversion to achieve drug suction and injection, which is more conducive to cost savings compared to the need to use additional power equipment, such as motors, hydraulic pumps, pneumatic pumps and other solutions. In detail, the shell is first divided into a drug storage chamber, a first accommodating chamber and a second accommodating chamber. The drug storage chamber is used to temporarily store liquid medicine. In a specific scenario, when the liquid medicine is sucked into the drug storage chamber, the drug storage chamber plays a role of temporary storage. When the liquid medicine needs to be injected, the liquid medicine is ejected from the drug storage chamber through the injection head. The first accommodating chamber is mainly used to store the multi-stage transmission mechanism, and the second accommodating chamber is mainly used to store the energy storage liquid pushing mechanism. Then, by using the multi-stage transmission mechanism and the energy storage liquid pushing mechanism to cooperate, the multi-stage transmission mechanism can perform corresponding actions on the energy storage liquid pushing mechanism according to the state of the needle-free injection device. Specifically, when the needle-free injection device is in the drug absorption state, the energy storage liquid pushing mechanism can form a negative pressure environment between the drug storage chamber and the external environment through the sliding of the push rod in the shell, so that the liquid medicine is sucked into the drug storage chamber for temporary storage. At this time, the multi-stage transmission mechanism will fix the push rod in the energy storage liquid pushing mechanism to prevent the push rod from pushing the liquid medicine out of the drug storage chamber when it is not in the injection state. During the drug absorption process, the energy storage spring will be compressed, so that the energy storage spring accumulates elastic potential energy. When the needle-free injection device is in the injection state, the multi-stage transmission mechanism will release the push rod of the energy storage liquid pushing mechanism under the operation of the staff. After the push rod in the energy storage liquid pushing mechanism is not fixed, under the action of its own gravity and the potential energy of the energy storage spring, the elastic potential energy and gravity potential energy are converted into the kinetic energy of the push rod, so that the push rod quickly slides toward the drug storage cavity, quickly shrinks the space in the drug storage cavity, and quickly ejects the drug liquid in the drug storage cavity from the injection micropore at high pressure, completing the needle-free injection of the drug liquid. During the entire drug absorption and injection process, the absorption and high-speed injection of the drug liquid are achieved through pure mechanical transmission and energy conversion, without the need for additional other power sources, such as pumps or motors, etc., effectively reducing the weight and manufacturing cost of the needle-free injection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic diagram of the structure of a needle-free injection device provided in an embodiment of the present application;

[0045] Figure 2 for Figure 1 Schematic diagram of the explosion structure;

[0046] Figure 3 for Figure 1 A cross-sectional schematic diagram of

[0047] Figure 4 A schematic diagram of the structure of a multi-stage transmission mechanism in a needle-free injection device provided in an embodiment of the present application;

[0048] Figure 5 for Figure 4 Schematic diagram of the explosion structure;

[0049] Figure 6 A schematic diagram of the structure of an energy storage and fluid pushing mechanism in a needle-free injection device provided in an embodiment of the present application;

[0050] Figure 7 A schematic structural diagram of a primary transmission member in a needle-free injection device provided in an embodiment of the present application;

[0051] Figure 8 A schematic diagram of the structure of a secondary transmission member in a needle-free injection device provided in an embodiment of the present application;

[0052] Fig. 9 A schematic structural diagram of a main reset member in a needle-free injection device provided in an embodiment of the present application;

[0053] Fig.10 A schematic diagram of the structure of a push rod in a needle-free injection device provided in an embodiment of the present application;

[0054] Fig.11 A schematic diagram of the structure of a housing in a needle-free injection device provided in an embodiment of the present application;

[0055] Fig.12 A schematic diagram of the structure of an injection head in a needle-free injection device provided in an embodiment of the present application;

[0056] Fig.13 This is a structural schematic diagram of a fixing and releasing assembly in a needle-free injection device provided in an embodiment of the present application, which is disposed in a carrier.

[0057] Description of reference numerals:

[0058] 1. Shell; 11. First subshell; 12. Second subshell; 13. Reinforcement strip; 14. Observation window; 2. Injection head; 21. Injection section; 211. Pressure relief hole; 22. Drug storage section; 221. Injection micropore; 222. Drug storage cavity; 3. Multi-stage transmission mechanism; 31. Pressing head; 32. Bearing member; 321. Bearing groove; 322. Sliding groove; 323. First through hole; 33. First transmission member; 331. Transmission body; 332. Pressure column; 333. Pressure rod; 34. Second transmission member; 341. Ring body; 3411. Second through hole; 3412. Guide through groove; 342, guide block; 3421, guide slope; 343, limit block; 35, fixed release assembly; 351, threaded member; 3511, arc portion; 3512, sliding portion; 3513, sliding column; 36, main reset member; 361, annular main body; 362, elastic arm; 37, auxiliary reset assembly; 371, pressure plate; 372, reset spring; 373, fixed plate; 4, energy storage and liquid pushing mechanism; 41, push rod; 411, rotating section; 4111, limit strip; 412, fixed section; 42, energy storage spring; 43, rotating member; 44, anti-slip sleeve. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0060] In the description of this application, it should be understood that the words "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] See also Figures 1 to 12 An embodiment of the present application provides a needle-free injection device, including a housing 1, an injection head 2, a multi-stage transmission mechanism 3 and an energy storage and fluid pushing mechanism 4.

[0062] See also Figures 1 to 3 ,as well as Fig.11The shell 1 is provided with a first accommodating chamber, a second accommodating chamber and a third accommodating chamber. The injection head 2 is connected to the shell 1 and a part of the injection head 2 is located in the third accommodating chamber. The injection head 2 is provided with an injection micropore 221 and a drug storage chamber 222, and the injection micropore 221 is connected to the drug storage chamber 222. The multi-stage transmission mechanism 3 is arranged in the first accommodating chamber and extends outside the shell 1. The energy storage and fluid pushing mechanism 4 is arranged in the second accommodating chamber and extends outside the second accommodating chamber. The energy storage and fluid pushing mechanism 4 includes a push rod 41 and an energy storage spring 42. One end of the push rod 41 is connected to the multi-stage transmission mechanism 3, and the other end is slidably connected to the inner wall of the shell 1. The energy storage spring 42 is located in the second accommodating chamber and is sleeved on the push rod 41;

[0063] Among them, the needle-free injection device has an injection state and a drug absorption state. When the needle-free injection device is in the drug absorption state, the push rod 41 is connected to the multi-stage transmission device and the energy storage spring 42 is in a compressed state, and the push rod 41 is away from the drug storage chamber 222; when the needle-free injection device is in the injection state, the multi-stage transmission device releases the push rod 41, and the energy storage spring 42 pushes the push rod 41 into the drug storage chamber 222. The push rod 41 compresses the space of the drug storage chamber 222 so that the drug liquid in the drug storage chamber 222 is ejected from the injection micropore 221.

[0064] The technical solution provided in the present application realizes mechanical liquid pushing of the energy storage liquid pushing mechanism 4 through the cooperation of a multi-stage transmission mechanism 3 and an energy storage liquid pushing mechanism 4, and utilizes the elastic potential energy of the energy storage spring 42 and the self-gravity of the push rod 41 to ensure that the force exerted by the push rod 41 on the medicine liquid is sufficient to cause the medicine liquid to be ejected from the injection micropore 221 at high speed, thereby completing the needle-free injection of the medicine liquid. Moreover, the entire process only relies on mechanical transmission and energy conversion to realize drug suction and injection, which is more conducive to cost savings compared to solutions that require the use of additional power equipment, such as motors, hydraulic pumps, pneumatic pumps, etc. In detail, the shell 1 is first divided into a medicine storage chamber 222, a first accommodating chamber and a second accommodating chamber. The medicine storage chamber 222 is used to temporarily store liquid medicine. In a specific scenario, when the liquid medicine is sucked into the medicine storage chamber 222, the medicine storage chamber 222 serves as a temporary storage. When the liquid medicine needs to be injected, the liquid medicine is ejected from the medicine storage chamber 222 through the injection head 2. The first accommodating chamber is mainly used to store the multi-stage transmission mechanism 3, and the second accommodating chamber is mainly used to store the energy storage and liquid pushing mechanism 4; then, by utilizing the cooperation between the multi-stage transmission mechanism 3 and the energy storage and liquid pushing mechanism 4, the multi-stage transmission mechanism 3 can perform corresponding actions on the energy storage and liquid pushing mechanism 4 according to the state of the needle-free injection device. Specifically, when the needle-free injection device is in the drug suction state, the energy storage and liquid pushing mechanism 4 can form a negative pressure environment between the drug storage chamber 222 and the external environment through the sliding of the push rod 41 in the shell 1, so that the drug liquid is sucked into the drug storage chamber 222 for temporary storage. At this time, the multi-stage transmission mechanism 3 will fix the push rod 41 in the energy storage and liquid pushing mechanism 4 to prevent the push rod 41 from pushing the drug liquid out of the drug storage chamber 222 when it is not in the injection state. During the process of drug absorption, the energy storage spring 42 will be compressed, so that the energy storage spring 42 accumulates elastic potential energy. When the needle-free injection device is in the injection state, the multi-stage transmission mechanism 3 will release the push rod 41 of the energy storage liquid pushing mechanism 4 under the operation of the staff. After the push rod 41 in the energy storage liquid pushing mechanism 4 is not fixed, under the action of its own gravity and the potential energy of the energy storage spring 42, the elastic potential energy and the gravity potential energy are converted into the kinetic energy of the push rod 41, so that the push rod 41 quickly slides toward the drug storage cavity 222, quickly shrinks the space in the drug storage cavity 222, and quickly ejects the drug liquid in the drug storage cavity 222 from the injection micropore 221 at high pressure, completing the needle-free injection of the drug liquid. During the entire process of drug absorption and injection, the absorption and high-speed injection of the drug liquid are achieved through pure mechanical transmission and energy conversion, without the need for additional other power sources, such as pumps or motors, etc., effectively reducing the weight and manufacturing cost of the needle-free injection device.

[0065] In some embodiments, see Figure 4 and Figure 5 The multi-stage transmission mechanism 3 includes a pressing head 31, a bearing member 32, a primary transmission member 33, a secondary transmission member 34 and a primary fixing and releasing component 35.

[0066] Among them, the pressing head 31 is mainly used for the user to press to push the liquid medicine out of the needle-free injection device to complete the injection. The bearing member 32 is arranged opposite to the pressing head 31, and is used to carry some transmission components in the transmission mechanism. The primary transmission member 33 is connected to the pressing head 31 and is located between the bearing member 32 and the pressing head 31, and the pressing head 31 transmits linear motion to the primary transmission member 33. The secondary transmission member 34 is arranged between the primary transmission member 33 and the bearing member 32, and the primary transmission member 33 contacts the secondary transmission member 34 and transmits the linear motion to the secondary transmission member 34, and the secondary transmission member 34 converts the linear motion into rotational motion. The fixed release component 35 is arranged on the bearing member 32, and the side of the fixed release component 35 away from the bearing member 32 is slidably connected to the secondary transmission member 34. The fixed release component 35 has a fixed state and a released state. When the fixed release assembly 35 is in a fixed state, the fixed release assembly 35 is fixedly connected to the push rod 41. When the fixed release assembly 35 is in a released state, the fixed release assembly 35 has no contact with the push rod 41. The fixed release assembly 35 can switch between the fixed state and the released state as the secondary transmission member 34 rotates.

[0067] Specifically, when the user presses the pressing head 31, the pressing head 31 transmits the linear motion to the primary transmission member 33, and the primary transmission member 33 is pressed down with the pressing head 31, forming a downward pressing force on the secondary transmission member 34. The secondary transmission member 34 is in a fixed state in the linear direction. When the primary transmission member 33 applies the linear force to the secondary transmission member 34, the secondary transmission member 34 cooperates with the primary transmission member 33 through its own structure, so that it converts the linear motion into a rotational motion. At this time, the secondary transmission member 34 transmits the rotational motion to the fixed release component 35, and the fixed release component 35 is converted from the fixed state to the released state, so that the fixed release component 35 releases the push rod 41. At this time, the push rod 41 can push the liquid in the drug storage cavity 222 out of the injection micropore 221 under the action of its own gravity and the energy storage liquid pushing mechanism 4.

[0068] Furthermore, the bearing member 32 is provided with a bearing groove 321 and a plurality of slide grooves 322. The bearing groove 321 is circular, and a first through hole 323 for the push rod 41 to pass through is provided at the center of the bearing groove 321, and a plurality of slide grooves 322 are distributed along the circumferential array of the bearing groove 321 and are all connected to the bearing groove 321. The bearing groove 321 is mainly used to carry the fixed release assembly 35, and the first through hole 323 is mainly used to allow the push rod 41 to move in a linear direction, providing space for the push rod 41 to absorb and push medicine.

[0069] See also Fig.13The fixing release assembly 35 includes a plurality of threaded members 351. The plurality of threaded members 351 are arranged in an array along the circumference of the push rod 41, and a portion of each threaded member 351 that is away from the first through hole 323 is slidably connected to a corresponding slide groove 322. When the secondary transmission member 34 rotates, the threaded member 351 is driven to slide in the slide groove 322 of the fixing release assembly 35, and then the plurality of threaded members 351 are moved toward or away from each other toward the first through hole 323. The threaded member 351 is provided with a thread on one side away from the slide groove. When the plurality of threaded members 351 are moved toward each other, the threads on the plurality of threaded members 351 are connected to each other to form a complete threaded hole, and the push rod 41 is threadedly connected to the threaded hole so that the push rod 41 is fixed. When the plurality of threaded members 351 are away from each other, the threaded hole is disassembled, and at this time, the push rod 41 is not in contact with the threaded member 351, so that the push rod 41 is released.

[0070] When the fixed release assembly 35 is in a fixed state, a plurality of threaded members 351 surround to form a circular ring. The threads of the plurality of threaded members 351 are connected in sequence along the circumferential direction, the push rod 41 is threadedly connected with the plurality of threaded members 351, and the push rod 41 is threadedly connected with the plurality of threaded members 351. When the fixed release assembly 35 is in a released state, the threaded member 351 slides in the slide groove 322 in a direction away from the push rod 41, the plurality of threaded members 351 are separated, and the threaded member 351 is not in contact with the push rod 41. The specific matching relationship between the threaded member 351 and the slide groove 322 will be further described in the subsequent embodiments.

[0071] In some embodiments, the threaded member 351 includes an arcuate portion 3511 and a sliding portion 3512. The arcuate portion 3511 is connected to the sliding portion 3512, and the sliding portion 3512 is slidably connected to the slide groove 322. The arcuate portion 3511 is provided with a thread on the side away from the sliding portion 3512. The arcuate portions 3511 of the plurality of threaded members 351 are concentric and have the same radius, so as to ensure that the plurality of threaded members 351 can form a first through hole 323 with a complete thread on the inner side when the plurality of threaded members 351 are close to each other. The threads of the plurality of threaded members 351 are sequentially connected in the circumferential direction to form a thread that matches the thread on the push rod 41.

[0072] For further information, see Figure 8 The secondary transmission member 34 includes an annular body 341 and a plurality of guide blocks 342. The annular body 341 is disposed on the bearing member 32, and the plurality of guide blocks 342 are arranged in an array along the inner wall of the annular body 341. A second through hole 3411 and a plurality of guide slots 3412 are provided at the bottom of the annular body 341. The plurality of guide slots 3412 are arranged in an array around the second through hole 3411, one end of the guide slot 3412 is arranged close to the second through hole 3411, and the other end of the guide slot 3412 is arranged away from the second through hole 3411.

[0073] The guide block 342 is provided with a guide bevel 3421, which is inclined in the circumferential direction, and the side of the primary transmission member 33 away from the pressing head 31 contacts the guide bevel 3421. When the primary transmission member 33 is pressed down, the side of the primary transmission member 33 away from the pressing head 31 slides along the guide bevel 3421, driving the secondary transmission member 34 to rotate. Specifically, when the primary transmission member 33 is pressed down, since the annular body 341 cannot move in the linear direction, and the primary transmission member 33 will squeeze the guide bevel 3421 during the pressing process, and then through the bevel guidance, the annular body 341 converts the linear motion into the rotational motion.

[0074] A sliding post 3513 is provided on a side of the sliding portion 3512 away from the carrier 32. The sliding post 3513 is disposed in the guide slot 3412. When the fixing release assembly 35 is in a fixed state, the sliding post 3513 is disposed on a side of the guide slot 3412 close to the second through hole 3411. When the fixing release assembly 35 is in a released state, the sliding post 3513 is disposed on a side of the guide slot 3412 away from the second through hole 3411.

[0075] Specifically, when the user presses the pressing head 31, the pressing head 31 transmits the linear motion to the primary transmission member 33, the primary transmission member 33 presses the secondary transmission member 34, the secondary transmission member 34 is constrained in the linear direction, and the guiding inclined surface 3421 on the guide block 342 is used to make the force of the primary transmission member 33 act on the guiding inclined surface 3421, driving the annular body 341 to rotate. When the annular body 341 rotates, the sliding column 3513 located in the guiding groove 3412 will move from the side close to the second through hole 3411 to the side away from the second through hole 3411, thereby converting the multiple threaded members 351 from the state of being close to each other and being threadedly connected with the push rod 41 to the state of multiple threaded members 351 being separated, the threaded hole disappears, and the push rod 41 is not in contact with the threaded member 351, thereby achieving the purpose of the push rod 41 pushing the liquid medicine.

[0076] In some embodiments, a stopper 343 is provided on one side of the guide block 342 along the circumferential direction. The stopper 343 is located on one side of the guide slope 3421 close to the bottom of the annular body 341, and is mainly used to limit the downward pressing distance of the primary transmission member 33, and then limit the rotation angle of the annular body 341. Specifically, when the primary transmission member 33 is pressed downward, the force of the primary transmission member 33 acts on the guide slope 3421, driving the secondary transmission member 34 to rotate, and the stopper 343 will gradually approach the primary transmission member 33 until the primary transmission member 33 abuts against the stopper 343 to form a limit.

[0077] In some embodiments, see Figure 7The primary transmission member 33 includes a transmission body 331 and a plurality of pressure posts 332. One side of the transmission body 331 contacts the pressing head 31, and the pressure posts 332 are connected to the side of the transmission body 331 away from the pressing head 31. One pressure post 332 contacts the guide slope 3421 of one guide block 342. When the primary transmission member 33 is pressed by the pressing head 31, the pressure posts 332 press the guide slope 3421, thereby driving the annular body 341 to rotate.

[0078] Furthermore, the surface of the pressing column 332 in contact with the guiding inclined surface 3421 is an arc surface, which facilitates the pressing column 332 to press down along the guiding inclined surface 3421 and drive the annular body 341 to rotate. The use of the arc surface contact method is conducive to improving the smoothness of the rotation of the annular body 341, and is also conducive to protecting the pressing column 332 and the guiding inclined surface 3421, thereby extending the service life of the needle-free injection device.

[0079] In some embodiments, see Figure 5 and Fig. 9 The multi-stage transmission mechanism 3 also includes a main reset member 36. The main reset member 36 is arranged on the annular body 341, and the outer edge of the main reset member 36 is tangent to the guide block 342 and has elastic properties. When the fixed release assembly 35 is in a fixed state, the outer edge of the main reset member 36 remains in a natural state. When the fixed release assembly 35 is in a released state, the outer edge of the main reset member 36 is squeezed by the guide block 342 and is in a deformed state. Specifically, when the fixed release assembly 35 is in a fixed state, the annular body 341 does not rotate at this time, and the outer edge of the main reset member 36 is only in tangential contact with the guide block 342, but is not squeezed by the guide block 342, so that the main reset member 36 is in a natural state, which is also the state that the main reset member 36 maintains for a long time when the needle-free injection device is not in use, which is conducive to improving the service life of the main reset member 36. When the fixed release assembly 35 is in the released state, the annular body 341 rotates due to the abutment of the primary transmission member 33, and the guide block 342 also rotates accordingly, thereby forming an extrusion force on the main reset member 36, causing the main reset member 36 to deform. The main reset member 36 forms a reverse force on the guide block 342. When the pressing force is withdrawn, the main reset member 36 will squeeze the guide block 342 to restore its original state, causing the annular body 341 to rotate in the opposite direction and return to its original position, thereby completing the reset of each component in the multi-stage transmission mechanism 3 and ensuring that the needle-free injection device can be recycled.

[0080] For further information, see Fig. 9 The main reset member 36 includes an annular main body 341 and a plurality of elastic arms 362 .

[0081] The annular main body 341 is coaxially arranged with the second through hole 3411 to provide space for the movement of the push rod 41. Multiple elastic arms 362 are connected to the annular main body 341 and arranged in an array along the circumferential direction of the annular main body 341. One end of each elastic arm 362 away from the main body is tangent to a guide block 342. When the fixed release assembly 35 is in a fixed state, the elastic arm 362 maintains a natural state. When the fixed release assembly 35 is in a released state, the elastic arm 362 is squeezed by the guide block 342 and is in a deformed state. In this embodiment, the number of elastic arms 362 is three, and correspondingly, the number of guide blocks 342 is also three. The three elastic arms 362 are distributed in a circumferential array, and the interval between two adjacent elastic arms 362 is 120°. Similarly, the interval between adjacent guide blocks 342 is 120°.

[0082] In some embodiments, the multi-stage transmission mechanism 3 further includes a secondary reset component 37. The secondary reset component 37 is disposed on a side of the carrier 32 away from the pressing head 31 and in contact with the primary transmission member 33. The secondary reset component 37 is mainly used to assist the main reset component in driving the primary transmission member 33 and the secondary transmission member 34 to reset. The secondary reset component 37 specifically provides a greater reset force for the main reset component to overcome resistance in the reset process, such as friction, gravity, etc.

[0083] See also Figure 5 , the auxiliary reset assembly 37 includes a pressure plate 371, a fixed plate 373 and a reset spring 372. The pressure plate 371 is arranged opposite to the fixed plate 373, and the pressure plate 371 contacts the primary transmission member 33. The reset spring 372 is arranged between the pressure plate 371 and the fixed plate 373, and the two ends of the reset spring 372 are respectively in contact with the pressure plate 371 and the fixed plate 373. When the fixed release assembly 35 is in a fixed state, the reset spring 372 maintains a natural state. When the fixed release assembly 35 is in a released state, the reset spring 372 is squeezed by the fixed plate 373 and the pressure plate 371 and is in a deformed state.

[0084] Specifically, when the pressing head 31 is pressed down to drive the primary transmission member 33 to be pressed down, the primary transmission member 33 will not only act on the secondary transmission member 34 to rotate the secondary transmission member 34, but also has a plurality of pressing rods 333, which are arranged at intervals along the circumferential direction, and the plurality of pressing rods 333 are in contact with the pressure plate 371. When the primary transmission member 33 is pressed down, the pressure plate 371 is pressed down, and the fixed plate 373 is used to clamp the return spring 372, so that the return spring 372 is compressed. When the pressing force is withdrawn, the elastic force of the return spring 372 will act on the pressure plate 371, and then the elastic force will act on the primary transmission member 33, so that the primary transmission member 33 and the secondary transmission member 34 are restored.

[0085] In some embodiments, see Fig.10The push rod 41 includes a rotating section 411 and a fixed section 412. The rotating section 411 and the fixed section 412 are integrally formed, which is conducive to improving the strength of the push rod 41. The rotating section 411 and the fixed section 412 are coaxially arranged, and the projected area of ​​the rotating section 411 along the axial direction is larger than the projected area of ​​the fixed section 412 along the axial direction, so that the rotating section 411 can have a larger area than the fixed section 412, providing an area for the subsequent connection of the energy storage spring 42. The energy storage spring 42 is sleeved on the fixed section 412, and one end of the energy storage spring 42 abuts against the side of the fixed plate 373 away from the pressure plate 371, and the other end of the energy storage spring 42 abuts against the rotating section 411, and one end of the fixed section 412 away from the rotating section 411 is threadedly connected to the threaded hole surrounded by multiple screw members 351. When the needle-free injection device is not used or when the medicine is inhaled, the fixed section 412 is threadedly connected to the threaded hole to prevent the fixed section 412 from falling. When the pressure plate 371 is pressed down by the primary transmission member 33, the energy storage spring 42 can be deformed and compressed to provide sufficient force for subsequent resetting.

[0086] For further information, see Figure 6 The energy storage and liquid pushing mechanism 4 also includes a rotating member 43. The rotating member 43 is fixedly sleeved on the rotating section 411, and the rotating member 43 is exposed outside the housing 1, so that the user can rotate the rotating member 43 without removing the housing 1. The rotation of the rotating member 43 will drive the rotating section 411 to rotate. During the rotation process, the fixed section 412 will move linearly under the action of the thread. During the linear movement process, because the space in the housing 1 is changed, a negative pressure is formed in the housing 1. When the rotating section 411 moves in a direction away from the injection head 2, the liquid medicine will enter the medicine storage cavity 222 through the injection micropore 221 under the action of air pressure, completing the process of sucking medicine. In addition, because the fixed section 412 is threadedly connected to the threaded member 351, when the rotating member 43 is rotated to extract the liquid medicine, even if the user cancels the rotation at this time, or puts down the entire needle-free injection device, the push rod 41 will not form a pushing effect on the liquid medicine, thereby preventing the liquid medicine from being ejected from the injection micropore 221 due to misoperation. Furthermore, because the movement of the push rod 41 is related to the amount of liquid medicine sucked, and the movement of the push rod 41 is related to the number of rotations of the rotating part 43, similar to the way a stepping motor calculates the step angle, this embodiment can obtain the movement of the push rod 41 and the amount of liquid medicine sucked by calculating the number of rotations of the rotating part 43, thereby realizing stepless adjustment of the amount of liquid medicine sucked.

[0087] In some embodiments, a plurality of limiting grooves are provided on the inner wall of the rotating member 43. A plurality of limiting strips 4111 are provided on the surface of the rotating section 411, and the limiting strips 4111 are slidably arranged in the limiting grooves, and the extension direction of the limiting strips 4111 is perpendicular to the rotation direction of the rotating member 43. By using the limiting grooves to limit the movement of the limiting strips 4111 in the rotation direction, when the rotating member 43 rotates, the rotating section 411 can be driven to rotate, and because the extension direction of the limiting strips 4111 is perpendicular to the rotation direction of the rotating member 43, the rotating section 411 can also move linearly in the axial direction.

[0088] In some embodiments, the energy storage and fluid pushing mechanism 4 further includes an anti-skid sleeve 44 , which is sleeved on the outer periphery of the rotating member 43 . The anti-skid sleeve 44 is provided with anti-skid grooves to increase friction and facilitate the user to rotate the anti-skid sleeve 44 .

[0089] In some embodiments, see Fig.11 The housing 1 includes a first sub-housing 11 and a second sub-housing 12. A first accommodating chamber and a second accommodating chamber are provided in the first sub-housing 11, and a third accommodating chamber is provided in the second sub-housing 12. A partition is provided where the first accommodating chamber and the second accommodating chamber are close to each other. The partition is annular, so that the partition can not only separate the two accommodating chambers, but also act as a limiter, so that the fixed disk 373 abuts against the partition, and prevents the fixed disk 373 from continuing to move toward the second accommodating chamber under the pressing action of the pressing head 31, resulting in the reset spring 372 being unable to be compressed. A rotating member 43 and an anti-slip sleeve 44 are provided between the first sub-housing 11 and the second sub-housing 12, and a reinforcing strip 13 is connected between the first sub-housing 11 and the second sub-housing 12, which not only improves the connection strength between the first sub-housing 11 and the second sub-housing 12, but also ensures that the anti-slip sleeve 44 is exposed between the two sub-housings 1, and does not affect the user's rotation of the anti-slip sleeve 44.

[0090] Furthermore, the rotating section 411 is engraved with a liquid medicine scale and an energy storage gear. The first sub-shell 11 is provided with an observation window 14, and the liquid medicine scale and the energy storage gear pass through the observation window 14 as the rotating section 411 rotates. An acrylic plate is provided at the observation window 14, which can not only seal the observation window 14, but also does not affect the observation of the inside of the accommodating cavity. When the user rotates the rotating member 43, the rotating section 411 rotates with the rotating member 43, and the user can observe the liquid medicine scale and the energy storage gear on the rotating section 411 through the observation window 14, realizing stepless adjustment of liquid medicine aspiration, which is conducive to accurate aspiration of liquid medicine.

[0091] In some embodiments, see Fig.12The injection head 2 includes a medicine storage section 22 and an injection section 21. The medicine storage section 22 is connected to the injection section 21 and is located between the rotating member 43 and the injection section 21. The medicine storage section 22 is cylindrical and has a medicine storage space inside. The injection section 21 is also cylindrical and has an opening at one end away from the medicine storage section 22 and forms a positioning groove. The user can locate the part of the patient to be injected with the medicine through the positioning groove, specifically by aligning the opening of the positioning groove of the injection section 21 with the part to be injected with the medicine. The bottom of the positioning groove is provided with an injection micropore 221, and the circumferential surface of the injection section 21 is provided with a plurality of pressure relief holes 211, and the pressure relief holes 211 are connected to the positioning groove. When the user presses the injection section 21 against the part of the patient where the medicine is to be injected, the injection process may become difficult due to the compression of the skin. Therefore, by setting the pressure relief hole 211, the air pressure in the positioning groove can be discharged through the pressure relief hole 211 without affecting the high-pressure and high-speed injection of the medicine by the injection micropore 221.

[0092] It should be noted that the diameter of the pressure relief hole 211 is larger than the diameter of the injection micropore 221, so that the pressure relief hole 211 can effectively relieve pressure while the injection micropore 221 can also ensure high-speed and high-pressure injection of the liquid medicine. The diameter of the injection micropore 221 ranges from 0.1 to 0.5 mm, and the diameter of the pressure relief hole 211 ranges from 10 to 30 mm.

[0093] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0094] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0095] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0096] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety, except for application history documents that are inconsistent with or conflicting with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or later attached to this application). It should be noted that if the description, definition, and / or use of terms in the attached materials of this application are inconsistent or conflicting with the content of this application, the description, definition, and / or use of terms in this application shall prevail.

[0097] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A needle-free injection device, characterized in that: include: The housing is provided with a first accommodating chamber, a second accommodating chamber and a third accommodating chamber; An injection head connected to the housing and a portion of the injection head is located in the third accommodating cavity, the injection head is provided with an injection micropore and a drug storage cavity, and the injection micropore is communicated with the drug storage cavity; A multi-stage transmission mechanism, disposed in the first accommodating chamber and extending outside the housing; An energy storage and fluid pushing mechanism is arranged in the second accommodating chamber and extends outside the second accommodating chamber, the energy storage and fluid pushing mechanism comprises a push rod and an energy storage spring, one end of the push rod is connected to the multi-stage transmission mechanism, and the other end is slidably connected to the inner wall of the shell, the energy storage spring is located in the second accommodating chamber and sleeved on the push rod; Wherein, the needle-free injection device has an injection state and a drug absorption state. When the needle-free injection device is in the drug absorption state, the push rod is connected to the multi-stage transmission device and the energy storage spring is in a compressed state, and the push rod is away from the drug storage chamber; When the needle-free injection device is in the injection state, the multi-stage transmission device releases the push rod, the energy storage spring pushes the push rod into the medicine storage chamber, and the push rod compresses the space of the medicine storage chamber so that the medicine liquid in the medicine storage chamber is ejected from the injection micropore.

2. The needle-free injection device according to claim 1, characterized in that: The multi-stage transmission mechanism comprises: Press the head; A bearing member, arranged opposite to the pressing head; a primary transmission member connected to the pressing head and located between the bearing member and the pressing head, wherein the pressing head transmits linear motion to the primary transmission member; A secondary transmission member is disposed between the primary transmission member and the bearing member, and the primary transmission member contacts the secondary transmission member and transmits linear motion to the secondary transmission member, and the secondary transmission member converts the linear motion into rotational motion; A fixed release assembly is arranged on the support member and is slidably connected to the secondary transmission member on a side of the fixed release assembly facing away from the support member. The fixed release assembly has a fixed state and a released state. When the fixed release assembly is in the fixed state, the fixed release assembly is fixedly connected to the push rod. When the fixed release assembly is in the released state, the fixed release assembly has no contact with the push rod. The fixed release assembly can switch between the fixed state and the released state as the secondary transmission member rotates.

3. The needle-free injection device according to claim 2, characterized in that: The bearing member is provided with a bearing groove and a plurality of slide grooves, the bearing groove is circular, a first through hole for the push rod to pass through is provided at the center of the bearing groove, and the plurality of slide grooves are distributed in a circumferential array along the bearing groove and are all connected to the bearing groove; The fixing and releasing assembly comprises a plurality of threaded members, which are arranged in a circumferential array along the push rod, a portion of each threaded member away from the first through hole is slidably connected to a corresponding sliding groove, and a side of the threaded member away from the sliding groove is provided with a thread; Among them, when the fixing and releasing assembly is in the fixing state, the multiple threaded members are surrounded to form a circular ring, and the threads of the multiple threaded members are connected in sequence along the circumferential direction, and the push rod is threadedly connected with the multiple threaded members; when the fixing and releasing assembly is in the releasing state, the threaded member slides in the sliding groove in the direction away from the push rod, the multiple threaded members are separated, and the threaded member has no contact with the push rod.

4. The needle-free injection device according to claim 3, characterized in that: The threaded member includes an arc-shaped portion and a sliding portion, the arc-shaped portion is connected to the sliding portion, the sliding portion is slidably connected to the slide groove, a thread is provided on the side of the arc-shaped portion away from the sliding portion, the arc-shaped portions of the plurality of threaded members are concentric and have the same radius, and the threads of the plurality of threaded members are sequentially connected along the circumferential direction to form a thread that matches the thread on the push rod.

5. The needle-free injection device according to claim 4, characterized in that: The secondary transmission member comprises an annular body and a plurality of guide blocks, wherein the annular body is arranged on the bearing member, the plurality of guide blocks are arranged in an array along the inner wall of the annular body, the bottom of the annular body is provided with a second through hole and a plurality of guide through grooves, the plurality of guide through grooves are arranged in an array around the second through hole, one end of the guide through groove is arranged close to the second through hole, and the other end of the guide through groove is arranged away from the second through hole; The guide block is provided with a guide slope, which is inclined in the circumferential direction, and the side of the primary transmission member away from the pressing head contacts the guide slope. When the primary transmission member is pressed down, the side of the primary transmission member away from the pressing head slides along the guide slope to drive the secondary transmission member to rotate; A sliding column is provided on the side of the sliding portion away from the supporting member, and the sliding column is arranged in the guide groove. When the fixed release assembly is in the fixed state, the sliding column is arranged on the side of the guide groove close to the second through hole. When the fixed release assembly is in the released state, the sliding column is arranged on the side of the guide groove away from the second through hole.

6. The needle-free injection device according to claim 5, characterized in that: A limiting block is provided on one side of the guide block along the circumferential direction, and the limiting block is located on a side of the guide inclined surface close to the bottom of the annular body.

7. The needle-free injection device according to claim 5, characterized in that: The primary transmission member includes a transmission body and a plurality of pressure columns, one side of the transmission body contacts the pressing head, the pressure columns are connected to a side of the transmission body away from the pressing head, and one of the pressure columns contacts a guide slope of the guide block.

8. The needle-free injection device according to claim 7, characterized in that: The surface of the pressure column in contact with the guiding inclined surface is a curved surface.

9. The needle-free injection device according to claim 5, characterized in that: The multi-stage transmission mechanism also includes a main reset member, which is arranged on the annular body, and the outer edge of the main reset member is tangent to the guide block and has elastic properties. When the fixing and releasing assembly is in the fixed state, the outer edge of the main reset member remains in a natural state. When the fixing and releasing assembly is in the released state, the outer edge of the main reset member is squeezed by the guide block and is in a deformed state.

10. The needle-free injection device according to claim 9, characterized in that: The main reset component comprises: An annular main body portion, coaxially arranged with the second through hole; A plurality of elastic arms, all connected to the annular main body and arranged in an array along the circumferential direction of the annular main body, wherein one end of each of the elastic arms away from the main body is tangent to one of the guide blocks; When the fixing and releasing assembly is in the fixing state, the elastic arm maintains a natural state. When the fixing and releasing assembly is in the releasing state, the elastic arm is squeezed by the guide block and is in a deformed state.

11. The needle-free injection device according to claim 9, characterized in that: The multi-stage transmission mechanism further comprises a secondary reset component, which is arranged on a side of the bearing member away from the pressing head and in contact with the primary transmission member; The auxiliary reset assembly includes a pressure plate, a fixed plate and a reset spring, wherein the pressure plate is arranged opposite to the fixed plate, the pressure plate contacts the primary transmission member, the reset spring is arranged between the pressure plate and the fixed plate, and two ends of the reset spring abut against the pressure plate and the fixed plate respectively; When the fixing release assembly is in the fixing state, the return spring maintains a natural state. When the fixing release assembly is in the releasing state, the return spring is squeezed by the fixing plate and the pressure plate and is in a deformed state.

12. The needle-free injection device according to claim 11, characterized in that: The push rod includes a rotating section and a fixed section, the rotating section and the fixed section are integrally formed, the rotating section and the fixed section are coaxially arranged, and the projection area of ​​the rotating section along the axial direction is larger than the projection area of ​​the fixed section along the axial direction, the energy storage spring is sleeved on the fixed section, and one end of the energy storage spring abuts against the side of the fixed plate away from the pressure plate, and the other end of the energy storage spring abuts against the rotating section, and one end of the fixed section away from the rotating section is threadedly connected to a threaded hole enclosed by a plurality of threaded members.

13. The needle-free injection device according to claim 12, characterized in that: The energy storage and fluid pushing mechanism further comprises a rotating member, which is fixedly sleeved on the rotating section and exposed outside the shell.

14. The needle-free injection device according to claim 13, characterized in that: The inner wall of the rotating member is provided with a plurality of limiting grooves, and the surface of the rotating section is provided with a plurality of limiting strips, the limiting strips are slidably arranged in the limiting grooves, and the extending direction of the limiting strips is perpendicular to the rotating direction of the rotating member.

15. The needle-free injection device according to claim 13, characterized in that: The energy storage and fluid pushing mechanism further comprises an anti-skid sleeve, which is sleeved on the outer periphery of the rotating member.

16. The needle-free injection device according to claim 15, characterized in that: The shell includes a first sub-shell and a second sub-shell, the first sub-shell is provided with the first accommodating cavity and the second accommodating cavity, the second sub-shell is provided with the third accommodating cavity, the rotating member and the anti-slip sleeve are provided between the first sub-shell and the second sub-shell, and a reinforcement strip is connected between the first sub-shell and the second sub-shell.

17. The needle-free injection device according to claim 16, characterized in that: The rotating section is engraved with a liquid medicine scale and an energy storage gear, and the first sub-shell is provided with an observation window, and the liquid medicine scale and the energy storage gear pass through the observation window as the rotating section rotates.

18. The needle-free injection device according to claim 13, characterized in that: The injection head includes a drug storage section and an injection section, wherein the drug storage section is connected to the injection section and the drug storage section is located between the rotating member and the injection section, the injection section is provided with a positioning groove, the bottom of the positioning groove is provided with the injection micropore, and the circumferential surface of the injection section is provided with a plurality of pressure relief holes, the pressure relief holes are connected to the positioning groove, and the diameter of the pressure relief holes is greater than the diameter of the injection micropore.

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