Needleless injection device

Abstract

The embodiment of the present application discloses a needleless injection device, which relates to the technical field of needleless injection. The needleless injection device includes: a housing, 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 includes 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 housing. The energy storage spring is located in the housing and sleeved on 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 to the multi-stage transmission device and the energy storage spring is in a compressed state, and the push rod is away from the medicine storage cavity. When the needleless injection device is in the injection state, the multi-stage transmission device releases the push rod, and the energy storage spring pushes the push rod into the medicine storage cavity, and the push rod compresses the space of the medicine storage cavity, so that the liquid medicine in the medicine storage cavity is ejected from the injection micropore. The present application can effectively reduce the manufacturing cost.

Description

Technical Field

[0001] This application relates to the field of needleless injection technology, and particularly to a needleless injection device. Background Art

[0002] The traditional drug injection method is to use a syringe with a pointed needle. The needle is inserted into the skin and then the liquid medicine is injected. Since the traditional syringe needs to insert the needle into the skin, it will cause pain and discomfort to the patient. For this reason, in the related art, needleless injection solutions for insulin, growth hormone, vaccines, etc. have been proposed. Needleless injection does not require a needle to puncture the human skin. Instead, by applying high pressure to the liquid medicine, the instantaneous high pressure generated by the power source makes the medicine in the syringe form a high-speed and high-pressure jet through the nozzle, so that it is injected into the patient's subcutaneous tissue through the micropores at the end, so that the medicine penetrates the outer layer of the skin to the subcutaneous, intradermal and other tissue layers to release the drug effect.

[0003] Because needleless injection requires a large amount of power, it is necessary to ensure that the liquid medicine forms a high-speed jet under high pressure. Therefore, the needleless syringes in the related art generally use electric or pneumatic power sources, such as air pumps, motors, etc., which is not conducive to reducing the manufacturing cost of needleless injection. Summary of the Invention

[0004] The embodiments of this application provide a needleless injection device, which can ensure that the needleless injection device reduces the manufacturing cost on the basis of meeting the power required for injection.

[0005] In a first aspect, the embodiments of this application provide a needleless injection device, which includes:

[0006] A housing, which is provided with a first accommodation cavity, a second accommodation cavity and a third accommodation cavity;

[0007] An injection head, which is connected to the housing and a part of the injection head is located in the third accommodation cavity. 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;

[0008] A multi-stage transmission mechanism, which is arranged in the first accommodation cavity and extends outside the housing;

[0009] An energy storage liquid pushing mechanism, which is arranged in the second accommodation cavity and extends outside the second accommodation cavity. The energy storage liquid pushing mechanism includes 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 housing. The energy storage spring is located in the second accommodation cavity and sleeved on the push rod;

[0010] Wherein, 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 to the multi-stage transmission device and the energy storage spring is in a compressed state, and the push rod is away from the medicine storage cavity; when the needleless injection device is in the injection state, the multi-stage transmission device releases the push rod, and the energy storage spring pushes the push rod into the medicine storage cavity, and the push rod compresses the space of the medicine storage cavity, so that the liquid medicine in the medicine storage cavity is ejected from the injection micropores.

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

[0012] A pressing head;

[0013] A carrier, disposed opposite to the pressing head;

[0014] A first-stage transmission member, connected to the pressing head and located between the carrier and the pressing head, and the pressing head transmits linear motion to the first-stage transmission member;

[0015] A second-stage transmission member, disposed between the first-stage transmission member and the carrier, and the first-stage transmission member contacts the second-stage transmission member and transmits linear motion to the second-stage transmission member, and the second-stage transmission member converts linear motion into rotational motion;

[0016] A fixed release assembly, disposed on the carrier and the side of the fixed release assembly facing away from the carrier is slidably connected to the second-stage transmission member. The fixed release assembly has a fixed state and a release 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 release state, the fixed release assembly has no contact with the push rod, and the fixed release assembly can switch between the fixed state and the release state as the second-stage transmission member rotates.

[0017] In some embodiments of the present application, the carrier is provided with a carrier groove and a plurality of sliding grooves. The carrier groove is circular, a first through hole for the push rod to pass through is opened at the center of the carrier groove, and the plurality of sliding grooves are circumferentially arrayed along the carrier groove and are all communicated with the carrier groove;

[0018] The fixed release assembly includes a plurality of threaded members, and the plurality of threaded members are circumferentially arrayed along the push rod. A part of each threaded member facing away from the first through hole is slidably connected to a corresponding sliding groove, and a thread is provided on the side of the threaded member facing away from the sliding groove;

[0019] Among them, when the fixed release component is in the fixed state, a plurality of the threaded members form an annular shape around, and the threads of the plurality of the threaded members are connected in sequence in the circumferential direction, and the push rod is threadedly connected to the plurality of the threaded members; when the fixed release component is in the release state, the threaded members slide in the chute in a direction away from the push rod, the plurality of the threaded members are separated, and the threaded members are not in contact with the push rod.

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

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

[0022] The guiding block is provided with a guiding inclined surface, the guiding inclined surface is inclined in the circumferential direction, a side of the primary transmission member away from the pressing head contacts the guiding inclined surface, when the primary transmission member is pressed down, the side of the primary transmission member away from the pressing head slides along the guiding inclined surface to drive the secondary transmission member to rotate;

[0023] A sliding column is provided on a side of the sliding portion away from the bearing member, the sliding column is arranged in the guiding through groove, when the fixed release component is in the fixed state, the sliding column is arranged on a side of the guiding through groove close to the second through hole, and when the fixed release component is in the release state, the sliding column is arranged on a side of the guiding through groove away from the second through hole.

[0024] In some embodiments of the present application, a limiting block is provided on a side of the guiding block in the circumferential direction, and the limiting block is located on a side of the guiding inclined surface close to the bottom of the annular main body.

[0025] In some embodiments of the present application, the primary transmission member includes a transmission main body and a plurality of pressing columns, one side of the transmission main body contacts the pressing head, the pressing columns are connected to a side of the transmission main body away from the pressing head, and one pressing column contacts the guiding inclined surface of one guiding block.

[0026] In some embodiments of the present application, the surface of the pressing post in contact with the guiding inclined surface is an arc surface.

[0027] In some embodiments of the present application, the multi-stage transmission mechanism further includes a main reset member. The main reset member is disposed on the annular body. The outer edge of the main reset member is tangent to the guiding block and has elastic characteristics. When the fixing and releasing assembly is in the fixed state, the outer edge of the main reset member remains in the natural state. When the fixing and releasing assembly is in the releasing state, the outer edge of the main reset member is squeezed by the guiding 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 portion and arranged in an array along the circumferential direction of the annular main body portion. One end of each elastic arm away from the main body portion is tangent to one of the guiding blocks;

[0031] When the fixing and releasing assembly is in the fixed state, the elastic arms remain in the natural state. When the fixing and releasing assembly is in the releasing state, the elastic arms are squeezed by the guiding blocks and are in a deformed state.

[0032] In some embodiments of the present application, the multi-stage transmission mechanism further includes a secondary reset assembly. The secondary reset assembly is disposed on the side of the carrier away from the pressing head and is in contact with the first-stage transmission member;

[0033] The secondary reset assembly includes a pressing disc, a fixing disc and a reset spring. The pressing disc and the fixing disc are oppositely arranged. The pressing disc is in contact with the first-stage transmission member. The reset spring is disposed between the pressing disc and the fixing disc, and both ends of the reset spring are respectively abutted against the pressing disc and the fixing disc;

[0034] When the fixing and releasing assembly is in the fixed state, the reset spring remains in the natural state. When the fixing and releasing assembly is in the releasing state, the reset spring is squeezed by the fixing disc and the pressing disc 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 projected area of the rotating section in the axial direction is larger than the projected area of the fixed section in 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 disk away from the pressing disk, and the other end of the energy storage spring abuts against the rotating section. The end of the fixed section away from the rotating section is threadedly connected to the threaded hole enclosed by the plurality of threaded members.

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

[0037] In some embodiments of the present application, a plurality of limiting grooves are provided on the inner wall of the rotating member, and a plurality of limiting strips are provided on the surface of the rotating section. 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.

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

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

[0040] In some embodiments of the present application, liquid medicine scales and energy storage gears are engraved on the rotating section. An observation window is provided on the first sub-housing. The liquid medicine scales and the energy storage gears pass through the observation window as the rotating section rotates.

[0041] In some embodiments of the present application, the injection head includes a medicine storage section and an injection section. The medicine storage section is connected to the injection section and is located between the rotating member and the injection section. A positioning groove is provided in the injection section, an injection micropore is provided at the bottom of the positioning groove, a plurality of pressure relief holes are provided on the circumferential surface of the injection section, the pressure relief holes are communicated with 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 in the embodiment of the present application, the mechanical liquid pushing of the energy storage liquid pushing mechanism is mainly achieved through the cooperation of the multi-stage transmission mechanism and the energy storage liquid pushing mechanism. The elastic potential energy of the energy storage spring and the self-gravity of the push rod are utilized to ensure that the force of the push rod on the liquid medicine is sufficient to enable the liquid medicine to be ejected from the injection micropores at a high speed, completing the needle-free injection of the liquid medicine. And the whole process only relies on mechanical transmission and energy conversion to realize medicine suction and injection. Compared with the solutions that require additional power equipment such as motors, hydraulic pumps, and pneumatic pumps, it is more conducive to cost savings. Specifically, first, the housing is divided into a medicine storage chamber, a first accommodation chamber, and a second accommodation chamber. The medicine storage chamber is used to temporarily store the liquid medicine. Specifically, when the liquid medicine is sucked into the medicine storage chamber, the medicine storage chamber plays a role of temporary storage. When it is necessary to inject the liquid medicine, the liquid medicine is ejected from the medicine storage chamber through the injection head. The first accommodation chamber is mainly used to store the multi-stage transmission mechanism, and the second accommodation chamber is mainly used to store the energy storage liquid pushing mechanism. Then, by using the cooperation of the multi-stage transmission mechanism and the energy storage liquid pushing mechanism, 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 medicine suction state, the energy storage liquid pushing mechanism can form a negative pressure environment between the medicine storage chamber and the external environment through the sliding of the push rod in the housing, so that the liquid medicine is sucked into the medicine 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 medicine storage chamber when it is not in the injection state. During the medicine suction 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, under the operation of the staff, release the push rod of the energy storage liquid pushing mechanism. After the push rod in the energy storage liquid pushing mechanism is no longer subject to the fixing effect, under the action of its own gravity and the potential energy of the energy storage spring, the elastic potential energy and the gravitational potential energy are converted into the kinetic energy of the push rod, so that the push rod quickly slides towards the medicine storage chamber, quickly reducing the space in the medicine storage chamber, and quickly ejecting the liquid medicine in the medicine storage chamber from the injection micropores at a high pressure, completing the needle-free injection of the liquid medicine. During the whole medicine suction and injection process, the suction and high-speed injection of the liquid medicine are realized through pure mechanical transmission and energy conversion, without the need to be additionally equipped with other power sources such as pumps or motors, effectively reducing the weight and manufacturing cost of the needle-free injection device. Description of the Drawings

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

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

[0045] Figure 2 is Figure 1 explosion structure schematic diagram of

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

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

[0048] Figure 5 is Figure 4 explosion structure schematic diagram of

[0049] Figure 6 is the structure schematic diagram of an energy storage liquid pushing mechanism in a needleless injection device provided by an embodiment of the present application;

[0050] Figure 7 is the structure schematic diagram of a primary transmission part in a needleless injection device provided by an embodiment of the present application;

[0051] Figure 8 is the structure schematic diagram of a secondary transmission part in a needleless injection device provided by an embodiment of the present application;

[0052] Figure 9 is the structure schematic diagram of a main reset part in a needleless injection device provided by an embodiment of the present application;

[0053] Figure 10 is the structure schematic diagram of a push rod in a needleless injection device provided by an embodiment of the present application;

[0054] Figure 11 is the structure schematic diagram of a housing in a needleless injection device provided by an embodiment of the present application;

[0055] Figure 12 is the structure schematic diagram of an injection head in a needleless injection device provided by an embodiment of the present application;

[0056] Figure 13 is the structure schematic diagram of a fixed release assembly arranged in a carrier in a needleless injection device provided by an embodiment of the present application.

[0057] Explanation of reference numerals:

[0058] 1. Housing; 11. First sub-housing; 12. Second sub-housing; 13. Reinforcing strip; 14. Observation window; 2. Injection head; 21. Injection section; 211. Pressure relief hole; 22. Medicine storage section; 221. Injection micropores; 222. Medicine storage cavity; 3. Multi-stage transmission mechanism; 31. Pressing head; 32. Carrier; 321. Carrier groove; 322. Chute; 323. First through hole; 33. First-stage transmission member; 331. Transmission main body; 332. Pressing column; 333. Pressing rod; 34. Second-stage transmission member; 341. Ring-shaped main body; 3411. Second through hole; 3412. Guide through groove; 342. Guide block; 3421. Guide inclined surface; 343. Limit block; 35. Fixed release assembly; 351. Threaded member; 3511. Arc portion; 3512. Sliding portion; 3513. Sliding column; 36. Main reset member; 361. Ring-shaped main body portion; 362. Elastic arm; 37. Sub-reset assembly; 371. Pressure plate; 372. Reset spring; 373. Fixed plate; 4. Energy storage 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 implementation manners

[0059] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope protected by the present application.

[0060] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specifically defined.

[0061] Please refer to Figures 1 to 12 , the embodiments of the present application provide a needleless injection device, including a housing 1, an injection head 2, a multi-stage transmission mechanism 3, and an energy storage liquid-pushing mechanism 4.

[0062] Please refer to Figures 1 to 3 , and Figure 11, the housing 1 is provided with a first accommodation cavity, a second accommodation cavity and a third accommodation cavity. The injection head 2 is connected to the housing 1 and a part of the injection head 2 is located in the third accommodation cavity. The injection head 2 is provided with injection micropores 221 and a medicine storage cavity 222, and the injection micropores 221 communicate with the medicine storage cavity 222. The multi-stage transmission mechanism 3 is arranged in the first accommodation cavity and extends outside the housing 1. The energy storage liquid pushing mechanism 4 is arranged in the second accommodation cavity and extends outside the second accommodation cavity. The energy storage liquid 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 housing 1. The energy storage spring 42 is located in the second accommodation cavity and sleeved on the push rod 41;

[0063] Among them, 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 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 medicine storage cavity 222; when the needleless 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 medicine storage cavity 222, and the push rod 41 compresses the space of the medicine storage cavity 222, so that the liquid medicine in the medicine storage cavity 222 is ejected from the injection micropores 221.

[0064] The technical solution provided by this application realizes the mechanical liquid pushing of the energy storage liquid pushing mechanism 4 through the cooperation of the multi-stage transmission mechanism 3 and the energy storage liquid pushing mechanism 4. The elastic potential energy of the energy storage spring 42 and the self-gravity of the push rod 41 are used to ensure that the acting force of the push rod 41 on the liquid medicine is sufficient to make the liquid medicine shoot out at high speed from the injection micropore 221, completing the needle-free injection of the liquid medicine. And the whole process only relies on mechanical transmission and energy conversion to realize medicine suction and injection. Compared with the solutions that need to adopt additional power equipment, such as motors, hydraulic pumps, pneumatic pumps, etc., it is more conducive to cost saving. Specifically, first, the housing 1 is divided into a medicine storage cavity 222, a first accommodation cavity, and a second accommodation cavity. The medicine storage cavity 222 is used for temporarily storing the liquid medicine. Specifically, when the liquid medicine is sucked into the medicine storage cavity 222, the medicine storage cavity 222 plays a role of temporary storage. When it is necessary to inject the liquid medicine, the liquid medicine will shoot out from the medicine storage cavity 222 through the injection head 2. The first accommodation cavity is mainly used for storing the multi-stage transmission mechanism 3, and the second accommodation cavity is mainly used for storing the energy storage liquid pushing mechanism 4. Then, by using the cooperation of the multi-stage transmission mechanism 3 and the energy storage liquid pushing mechanism 4, the multi-stage transmission mechanism 3 can perform corresponding actions on the energy storage liquid pushing mechanism 4 according to the state of the needle-free injection device. Specifically, when the needle-free injection device is in the medicine suction state, the energy storage liquid pushing mechanism 4 can form a negative pressure environment between the medicine storage cavity 222 and the external environment through the sliding of the push rod 41 in the housing 1, so that the liquid medicine is sucked into the medicine storage cavity 222 for temporary storage. At this time, the multi-stage transmission mechanism 3 will fix the push rod 41 in the energy storage liquid pushing mechanism 4 to prevent the push rod 41 from pushing out the liquid medicine from the medicine storage cavity 222 when it is not in the injection state. During the medicine suction process, 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, under the operation of the staff, release the push rod 41 of the energy storage liquid pushing mechanism 4. After the push rod 41 in the energy storage liquid pushing mechanism 4 is no longer under the fixing action, under the action of its own gravity and the potential energy of the energy storage spring 42, the elastic potential energy and the gravitational potential energy are converted into the kinetic energy of the push rod 41, so that the push rod 41 quickly slides towards the medicine storage cavity 222, quickly reducing the space in the medicine storage cavity 222, and quickly shooting out the liquid medicine in the medicine storage cavity 222 from the injection micropore 221 at high pressure, completing the needle-free injection of the liquid medicine. During the whole medicine suction and injection process, the suction and high-speed injection of the liquid medicine are realized through pure mechanical transmission and energy conversion, without the need to additionally equip 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, please refer to Figure 4 and Figure 5 , the multi-stage transmission mechanism 3 includes a pressing head 31, a carrier 32, a first-stage transmission member 33, a second-stage transmission member 34, and a first-stage fixing and releasing assembly 35.

[0066] Among them, the pressing head 31 is mainly used for the user to press, so as to eject the liquid medicine from the needleless injection device to complete the injection. The bearing member 32 is disposed opposite to the pressing head 31 and is used to bear some transmission components in the transmission mechanism. The first-level transmission member 33 is connected to the pressing head 31 and is located between the bearing member 32 and the pressing head 31. The pressing head 31 transmits linear motion to the first-level transmission member 33. The second-level transmission member 34 is disposed between the first-level transmission member 33 and the bearing member 32, and the first-level transmission member 33 contacts the second-level transmission member 34 and transmits linear motion to the second-level transmission member 34. The second-level transmission member 34 converts the linear motion into rotational motion. The fixed release assembly 35 is disposed on the bearing member 32, and one side of the fixed release assembly 35 facing away from the bearing member 32 is slidably connected to the second-level transmission member 34. The fixed release assembly 35 has a fixed state and a release state. When the fixed release assembly 35 is in the fixed state, the fixed release assembly 35 is fixedly connected to the push rod 41. When the fixed release assembly 35 is in the release state, the fixed release assembly 35 has no contact with the push rod 41, and the fixed release assembly 35 can switch between the fixed state and the release state as the second-level transmission member 34 rotates.

[0067] Specifically, when the user presses the pressing head 31, the pressing head 31 transmits linear motion to the first-level transmission member 33. The first-level transmission member 33 presses down with the pressing head 31 and forms a downward pressing force on the second-level transmission member 34. The second-level transmission member 34 is in a fixed state in the linear direction. When the first-level transmission member 33 applies a linear force to the second-level transmission member 34, the second-level transmission member 34 cooperates with the first-level transmission member 33 through its own structure to convert the linear motion into rotational motion. At this time, the second-level transmission member 34 transmits the rotational motion to the fixed release assembly 35, and the fixed release assembly 35 will switch from the fixed state to the release state, so that the fixed release assembly 35 releases the push rod 41. At this time, the push rod 41 can eject the liquid medicine in the medicine storage cavity 222 from the injection micropore 221 under its own gravity and the action of the energy storage liquid pushing mechanism 4.

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

[0069] Please refer to Figure 13, the fixed release component 35 includes a plurality of threaded members 351. The plurality of threaded members 351 are arranged in a circumferential array along the push rod 41, and a part of each threaded member 351 facing away from the first through hole 323 is slidably connected to a corresponding sliding groove 322. When the secondary transmission member 34 rotates, it drives the threaded members 351 to slide in the sliding grooves 322 of the fixed release component 35, and then makes the plurality of threaded members 351 approach or move away from each other toward the first through hole 323. Threads are provided on one side of the threaded member 351 facing away from the sliding groove. When the plurality of threaded members 351 approach 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 move away from each other, the threaded hole is disassembled, and at this time, the push rod 41 is not in contact with the threaded members 351, so that the push rod 41 is released.

[0070] Among them, when the fixed release component 35 is in a fixed state, the plurality of threaded members 351 surround and form an annular member. The threads of the plurality of threaded members 351 are sequentially connected in the circumferential direction, and the push rod 41 is threadedly connected to the plurality of threaded members 351. When the fixed release component 35 is in a released state, the threaded members 351 slide in the sliding grooves 322 in a direction away from the push rod 41, and the plurality of threaded members 351 are separated, and the threaded members 351 are not in contact with the push rod 41. The specific cooperation relationship between the threaded members 351 and the sliding grooves 322 will be further introduced in the subsequent embodiments.

[0071] In some embodiments, the threaded member 351 includes an arc portion 3511 and a sliding portion 3512. The arc portion 3511 is connected to the sliding portion 3512, the sliding portion 3512 is slidably connected to the sliding groove 322, and threads are provided on one side of the arc portion 3511 facing away from the sliding portion 3512. The arc portions 3511 of the plurality of threaded members 351 are concentric and have the same radius to ensure that when the plurality of threaded members 351 approach each other, a first through hole 323 with a complete thread on the inner side can be formed. 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] Furthermore, please refer to Figure 8 , the secondary transmission member 34 includes an annular main body 341 and a plurality of guide blocks 342. The annular main body 341 is provided on the carrier 32, and the plurality of guide blocks 342 are arranged in an array along the inner wall of the annular main body 341. A second through hole 3411 and a plurality of guide through grooves 3412 are formed at the bottom of the annular main body 341. The plurality of guide through grooves 3412 are arranged in an array around the second through hole 3411. One end of the guide through groove 3412 is close to the second through hole 3411, and the other end of the guide through groove 3412 is far from the second through hole 3411.

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

[0074] A sliding column 3513 is provided on the side of the sliding part 3512 away from the bearing member 32. The sliding column 3513 is arranged in the guiding through groove 3412. When the fixing and releasing assembly 35 is in the fixed state, the sliding column 3513 is arranged on the side of the guiding through groove 3412 close to the second through hole 3411. When the fixing and releasing assembly 35 is in the releasing state, the sliding column 3513 is arranged on the side of the guiding through groove 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 first-level transmission member 33, the first-level transmission member 33 presses the second-level transmission member 34, the second-level transmission member 34 is restricted in the linear direction, and by using the guiding inclined surface 3421 on the guiding block 342, the acting force of the first-level transmission member 33 acts on the guiding inclined surface 3421, driving the annular main body 341 to rotate. When the annular main body 341 rotates, the sliding column 3513 located in the guiding through 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 state where the plurality of threaded members 351 are close to each other and threadedly connected to the push rod 41 into a state where the plurality of threaded members 351 are separated, the threaded holes disappear, and the push rod 41 has no contact with the threaded members 351, achieving the purpose of the push rod 41 pushing the liquid medicine.

[0076] In some embodiments, a limiting block 343 is provided on one side of the guiding block 342 in the circumferential direction. The limiting block 343 is located on the side of the guiding inclined surface 3421 close to the bottom of the annular main body 341, mainly used to limit the distance that the first-level transmission member 33 is pressed down, and then limit the rotation angle of the annular main body 341. Specifically, when the first-level transmission member 33 is pressed down, the acting force of the first-level transmission member 33 acts on the guiding inclined surface 3421, driving the second-level transmission member 34 to rotate, and at the same time, the limiting block 343 will gradually approach the first-level transmission member 33 until the first-level transmission member 33 abuts against the limiting block 343 to form a limit.

[0077] In some embodiments, please refer to Figure 7, the first-level transmission member 33 includes a transmission main body 331 and a plurality of pressing columns 332. One side of the transmission main body 331 is in contact with the pressing head 31, the pressing columns 332 are connected to the side of the transmission main body 331 away from the pressing head 31, and one pressing column 332 is in contact with the guiding inclined surface 3421 of one guiding block 342. When the first-level transmission member 33 is pressed by the pressing head 31, the pressing column 332 presses against the guiding inclined surface 3421, thereby driving the annular main 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 drives the annular main body 341 to rotate. The arc surface contact method is beneficial to improving the rotation smoothness of the annular main body 341 and protecting the pressing column 332 and the guiding inclined surface 3421, and prolonging the service life of the needleless injection device.

[0079] In some embodiments, please refer to Figure 5 and Figure 9 , the multi-level transmission mechanism 3 further includes a main reset member 36. The main reset member 36 is provided on the annular main body 341, and the outer edge of the main reset member 36 is tangent to the guiding block 342 and has elastic characteristics. When the fixing and releasing assembly 35 is in the fixed state, the outer edge of the main reset member 36 remains in the natural state. When the fixing and releasing assembly 35 is in the releasing state, the outer edge of the main reset member 36 is squeezed by the guiding block 342 and is in a deformed state. Specifically, when the fixing and releasing assembly 35 is in the fixed state, the annular main body 341 does not rotate at this time, and the outer edge of the main reset member 36 is only tangent to the guiding block 342 but not squeezed by the guiding block 342, so that the main reset member 36 is in the natural state. This state is also the state that the main reset member 36 maintains for a long time when the needleless injection device is not in use, which is beneficial to improving the service life of the main reset member 36. When the fixing and releasing assembly 35 is in the releasing state, the annular main body 341 rotates due to the abutment of the first-level transmission member 33, and the guiding block 342 also rotates accordingly, thereby forming a squeezing force on the main reset member 36, causing the main reset member 36 to deform. The main reset member 36 forms a reverse acting force on the guiding block 342. When the pressing force is withdrawn, in order to return to its original state, the main reset member 36 will squeeze the guiding block 342, causing the annular main body 341 to rotate in the reverse direction and return to its original position, completing the reset of each component in the multi-level transmission mechanism 3 and ensuring that the needleless injection device can be used cyclically.

[0080] Furthermore, please refer to Figure 9 , the main reset member 36 includes an annular main body 341 part and a plurality of elastic arms 362.

[0081] Among them, the annular main body 341 is coaxially arranged with the second through hole 3411, providing space for the movement of the push rod 41. A plurality of elastic arms 362 are all connected to the annular main body 341 and are 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 guiding block 342. When the fixing and releasing component 35 is in the fixed state, the elastic arms 362 remain in the natural state. When the fixing and releasing component 35 is in the releasing state, the elastic arms 362 are squeezed by the guiding blocks 342 and are in a deformed state. In this embodiment, the number of elastic arms 362 is three. Correspondingly, the number of guiding blocks 342 is also three. The three elastic arms 362 are circumferentially arrayed, and the interval between two adjacent elastic arms 362 is 120°. Similarly, the interval between two adjacent guiding blocks 342 is 120°.

[0082] In some embodiments, the multi-stage transmission mechanism 3 further includes an auxiliary reset component 37. The auxiliary reset component 37 is arranged on the side of the carrier 32 away from the pressing head 31 and contacts the primary transmission member 33. The auxiliary 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. Specifically, the auxiliary reset component 37 provides a greater reset force for the main reset component to overcome the resistance existing in the reset process, such as friction, gravity, etc.

[0083] Please refer to Figure 5 , the auxiliary reset component 37 includes a pressure plate 371, a fixed plate 373 and a reset spring 372. The pressure plate 371 and the fixed plate 373 are arranged opposite to each other. 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 both ends of the reset spring 372 are abutted against the pressure plate 371 and the fixed plate 373 respectively. When the fixing and releasing component 35 is in the fixed state, the reset spring 372 remains in the natural state. When the fixing and releasing component 35 is in the releasing 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, in addition to acting on the secondary transmission member 34 to make the secondary transmission member 34 rotate, the primary transmission member 33 also has a plurality of pressure rods 333. The plurality of pressure rods 333 are arranged at intervals along the circumferential direction. The plurality of pressure rods 333 all contact the pressure plate 371. When the primary transmission member 33 is pressed down, it drives the pressure plate 371 to be pressed down, cooperating with the fixed plate 373 to form a clamping on the reset spring 372, so that the reset spring 372 is compressed. When the pressing force is withdrawn, the elastic force of the reset spring 372 will act on the pressure plate 371, and then 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, please refer to Figure 10, the 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 beneficial 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 in the axial direction is larger than the projected area of the fixed section 412 in the axial direction, so that a part of the area of the rotating section 411 can protrude compared with the fixed section 412, providing an area for the connection of the subsequent 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 disk 373 away from the pressure disk 371, and the other end of the energy storage spring 42 abuts against the rotating section 411. The end of the fixed section 412 away from the rotating section 411 is threadedly connected to the threaded hole surrounded by a plurality of threaded members 351. When the needleless injection device is not in use or when sucking medicine, the fixed section 412 is threadedly connected to the threaded hole to prevent the fixed section 412 from falling. When the pressure disk 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] Furthermore, please refer to Figure 6 , the energy storage liquid pushing mechanism 4 further 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, which is convenient for the user to rotate the rotating member 43 without removing the housing 1. The rotation of the rotating member 43 will drive the rotation of the rotating section 411. During the rotation process, the fixed section 412 will linearly move under the action of the thread. During the linear movement, because the space inside the housing 1 is changed, a negative pressure is formed inside the housing 1. When the rotating section 411 moves in the direction away from the injection head 2, the liquid medicine will enter the medicine storage cavity 222 through the injection micropores 221 under the action of air pressure, completing the process of sucking medicine. And because the fixed section 412 is threadedly connected to the threaded member 351, when rotating the rotating member 43 and sucking the liquid medicine, even if the user cancels the rotation at this time or puts down the entire needleless injection device, the push rod 41 will not form a pushing action on the liquid medicine, avoiding the liquid medicine from being ejected from the injection micropores 221 due to misoperation. And because the moving amount of the push rod 41 is related to the amount of liquid medicine sucked, and the moving amount of the push rod 41 is also related to the number of rotation turns of the rotating member 43. Similar to the way of calculating the step angle of a stepper motor, in this embodiment, the moving amount of the push rod 41 and the amount of liquid medicine sucked can be obtained by calculating the number of rotation turns of the rotating member 43, realizing stepless adjustment and sucking of the liquid medicine amount.

[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. The limiting strips 4111 are slidably disposed in the limiting grooves. The extending direction of the limiting strips 4111 is perpendicular to the rotating direction of the rotating member 43. By using the limiting grooves to limit the movement of the limiting strips 4111 in the rotating direction, when the rotating member 43 rotates, it can drive the rotating section 411 to rotate. And because the extending direction of the limiting strips 4111 is perpendicular to the rotating direction of the rotating member 43, the rotating section 411 can linearly move in the axial direction.

[0088] In some embodiments, the energy storage liquid pushing mechanism 4 further includes an anti-slip sleeve 44. The anti-slip sleeve 44 is sleeved on the outer periphery of the rotating member 43. Anti-slip lines are provided on the anti-slip sleeve 44 to increase the friction force and facilitate the user to rotate the anti-slip sleeve 44.

[0089] In some embodiments, please refer to Figure 11 , the housing 1 includes a first sub-housing 11 and a second sub-housing 12. A first accommodation cavity and a second accommodation cavity are provided in the first sub-housing 11, and a third accommodation cavity is provided in the second sub-housing 12. A partition plate is provided at a position where the first accommodation cavity and the second accommodation cavity are close to each other. The partition plate is annular, so that the partition plate can not only separate the two accommodation cavities, but also act as a limiting function. The fixing plate 373 abuts against the partition plate, preventing the fixing plate 373 from continuing to move toward the second accommodation cavity under the pressing action of the pressing head 31, resulting in the reset spring 372 not being 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. In addition to improving the connection strength between the first sub-housing 11 and the second sub-housing 12, it can also ensure that the anti-slip sleeve 44 is exposed between the two sub-housings 1 without affecting the user's rotation of the anti-slip sleeve 44.

[0090] Further, a liquid medicine scale and an energy storage gear are engraved on the rotating section 411. An observation window 14 is provided on the first sub-housing 11. 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 accommodation cavity. The user rotates the rotating member 43, and the rotating section 411 rotates with the rotating member 43. 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 suction of the liquid medicine, which is beneficial to the accurate suction of the liquid medicine.

[0091] In some embodiments, please refer to Figure 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 disclosed in the present application and thus help the understanding of one or more embodiments of the application, in the foregoing description of the embodiments of the present application, sometimes multiple features are incorporated into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the subject matter of the present application are more than those mentioned in the claims. In fact, the features of the embodiments are fewer than all the features of the single embodiment disclosed above.

[0096] For each patent, patent application, patent application publication, and other materials cited in the present application, such as articles, books, specifications, publications, documents, etc., their entire contents are hereby incorporated into the present application by reference, except for application history documents that are inconsistent with or conflict with the content of the present application, and also except for documents that limit the broadest scope of the claims of the present application (currently or subsequently appended to the present application). It should be noted that if there are any inconsistencies or conflicts between the descriptions, definitions, and / or uses of terms in the attached materials of the present application and the content of the present application, the descriptions, definitions, and / or uses of terms in the present application shall prevail.

[0097] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within 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 mechanism and the energy storage spring is in a compressed state, and the push rod is away from the drug storage cavity; when the needle-free injection device is in the injection state, the multi-stage transmission mechanism releases the push rod, the energy storage spring pushes the push rod into the drug storage cavity, and the push rod compresses the space of the drug storage cavity so that the drug liquid in the drug storage cavity is ejected from the injection micropore; 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.

2. The needle-free injection device according to claim 1, 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, 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; 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.

3. The needle-free injection device according to claim 2, 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.

4. The needle-free injection device according to claim 3, 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.

5. The needle-free injection device according to claim 4, 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.

6. The needle-free injection device according to claim 4, 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.

7. The needle-free injection device according to claim 6, characterized in that: The surface of the pressure column in contact with the guiding inclined surface is a curved surface.

8. The needle-free injection device according to claim 4, 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.

9. The needle-free injection device according to claim 8, 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.

10. The needle-free injection device according to claim 8, 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.

11. The needle-free injection device according to claim 10, 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.

12. The needle-free injection device according to claim 11, 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.

13. The needle-free injection device according to claim 12, 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.

14. The needle-free injection device according to claim 12, 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.

15. The needle-free injection device according to claim 14, 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.

16. The needle-free injection device according to claim 15, 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.

17. The needle-free injection device according to claim 12, 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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