Needleless injector

Abstract

The utility model provides a needleless injector which comprises a shell, an injection driving mechanism, a liquid inlet device, a liquid storage device and a spray head, the injection driving mechanism is connected to the liquid storage device and used for sucking a reagent into the liquid storage device through the liquid inlet device and spraying the reagent in the liquid storage device out through the spray head; the nozzle comprises a nozzle body, a nozzle one-way valve and a nozzle, and the nozzle is detachably connected to the nozzle body; wherein the nozzle body is provided with a containing cavity and a reagent inlet which are communicated, and the nozzle one-way valve is arranged in the containing cavity; the sprayer one-way valve comprises a one-way valve element and an elastic piece, the one-way valve element is of a cavity structure, the elastic piece is arranged in the cavity structure, a reagent outlet is formed in the side wall of the one-way valve element, and the reagent outlet is communicated with the cavity structure; the nozzle is provided with at least one jet hole, and the cavity structure is communicated with the jet hole. The needleless injector effectively solves the problems that a needleless injector is single in application scene, short in service life, low in injection frequency and the like.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, specifically relating to a needle-free injector. Background Technology

[0002] Needle-free injection, also known as jet injection, is a medical device that uses the instantaneous high pressure generated by a power source to propel the drug (liquid or lyophilized powder) in the syringe through the nozzle to form a high-speed, high-pressure jet, thereby allowing the drug to penetrate the outer layer of the skin and release its effects into the subcutaneous, intradermal, and other tissue layers.

[0003] Typically, the configuration of existing needle-free injectors cannot be changed. For example, the nozzle configuration cannot be changed, meaning a single-nozzle needle-free injector cannot be converted into a multi-nozzle needle-free injector, or the filter device of the needle-free injector cannot be replaced. In addition, needle-free injectors usually do not have a liquid backflow prevention structure. Furthermore, as the cam of the needle-free injector pushes the push rod to gradually compress the linear motion energy storage spring to the maximum spring compression, the spring force also increases linearly, and the cam torque also increases simultaneously. According to the characteristics of the motor, the speed of the motor driving the cam will inevitably decrease, which will reduce the number of continuous injections per minute of the needle-free injector compared to the theoretical design. The excessive decrease in motor speed will prolong the drug aspiration time of the injector. Summary of the Invention

[0004] This invention provides a needle-free injector to address the problems of limited application scenarios, short service life, and low injection frequency associated with needle-free injectors.

[0005] To solve the above-mentioned technical problems, this utility model provides a needleless injector, comprising a housing, an injection drive mechanism, a liquid inlet device, a liquid storage device, and a nozzle, wherein the injection drive mechanism, the liquid inlet device, the liquid storage device, and the nozzle are all disposed inside the housing;

[0006] The liquid inlet device and the nozzle are both connected to the liquid storage device, and the injection drive mechanism is connected to the liquid storage device for drawing the reagent into the liquid storage device through the liquid inlet device and spraying the reagent in the liquid storage device out through the nozzle.

[0007] The nozzle includes a nozzle body, a nozzle check valve, and a nozzle, wherein the nozzle is detachably connected to the nozzle body;

[0008] The nozzle body is provided with a connected receiving cavity and a reagent inlet, and the nozzle one-way valve is disposed in the receiving cavity;

[0009] The nozzle one-way valve includes a one-way valve core and an elastic element. The one-way valve core is configured as a cavity structure, and the elastic element is placed inside the cavity structure. A reagent outlet is provided on the side wall of the one-way valve core, and the reagent outlet is connected to the cavity structure.

[0010] The nozzle is provided with at least one injection hole, and the cavity structure is connected to the injection hole.

[0011] In some embodiments, the liquid inlet device includes a diaphragm check valve, wherein the diaphragm check valve includes a valve body having a first through hole and a diaphragm valve core disposed at one end of the valve body. The diaphragm valve core includes a diaphragm support, a diaphragm elastic element, and a diaphragm valve cover. The diaphragm support is fixedly connected to one end of the valve body, one end of the diaphragm elastic element is connected to the diaphragm support, and the other end of the diaphragm elastic element is connected to the diaphragm valve cover. The diaphragm valve cover is disposed on the valve port at one end of the valve body.

[0012] In some embodiments, the membrane support is annular, the membrane valve cover is disposed at the center of the membrane support, and there are multiple membrane elastic elements, each membrane elastic element is arc-shaped, and the multiple membrane elastic elements are evenly arranged along the outer periphery of the membrane valve cover.

[0013] In some embodiments, the membrane support, the membrane elastic element, and the membrane valve cover are integrally formed.

[0014] In some embodiments, threads are formed on the outer peripheral surface of the valve body, and the diaphragm check valve is detachably connected to the liquid storage device through the threads;

[0015] The inner surface of the valve body forms a first through hole with a multifaceted structure, so that the diaphragm check valve and the liquid storage device can be detachably connected by using a tool through the first through hole with the multifaceted structure.

[0016] In some embodiments, the liquid inlet device further includes: a liquid inlet conduit and a liquid inlet connector;

[0017] The liquid inlet connector is connected to one end of the liquid inlet conduit, and the diaphragm check valve is connected to the other end of the liquid inlet conduit; a filter is provided inside the liquid inlet connector, and the filter includes a filter body, an elastic conical ring, and a multi-stage filter screen;

[0018] The filter body is a hollow conical structure, and the conical ring is sleeved on the outer periphery of the filter body. The filtration accuracy of each of the multiple filter screens is different, and the multiple filter screens are arranged sequentially inside the filter body.

[0019] In some embodiments, the filtration precision of the filter screens increases sequentially along the direction of reagent flow, a filtration gap is provided between each two adjacent filter screens, and the filtration gap decreases sequentially along the direction of reagent flow.

[0020] In some embodiments, the injection drive mechanism includes a push rod assembly, an energy storage assembly, a drive assembly, and a base, wherein the push rod assembly, the energy storage assembly, and the drive assembly are all connected to the base;

[0021] The drive assembly is connected to the push rod assembly, the energy storage assembly is connected to the push rod assembly, the drive assembly drives the push rod assembly to move, and the movement of the push rod assembly drives the energy storage assembly to store energy.

[0022] In some embodiments, the push rod assembly includes a guide plate and a push rod, the guide plate being disposed on one side of the base, the guide plate having a second through hole, and the push rod extending through the second through hole to the other side of the base;

[0023] The energy storage component includes an energy storage spring and a connecting sleeve. The energy storage spring is sleeved on the push rod located on the other side of the base. The connecting sleeve is sleeved outside the energy storage spring, and the two ends of the connecting sleeve are respectively connected to the base and the liquid storage device.

[0024] In some embodiments, the second through hole is provided with a plurality of mounting grooves in the circumferential direction, wherein the parameters of at least one of the mounting grooves are different from the parameters of the remaining mounting grooves, and the push rod is provided with a plurality of protrusions in the circumferential direction, wherein the plurality of protrusions are configured to cooperate with the plurality of mounting grooves one by one.

[0025] In some embodiments, the drive assembly includes a drive motor and a cam, the drive motor and the cam being respectively disposed at both ends of the base. The drive motor is used to drive the cam to rotate, and the end face of the cam is used to push the push rod assembly to move. The end face includes a cam push segment, the contour line of the cam push segment corresponding to a push curve. The increment of the push curve is in a decreasing relationship with the rotation angle of the cam, and the velocity of the push rod is inversely proportional to the spring force of the push rod assembly.

[0026] The push rod assembly further includes a push block and a roller rotatably connected to the push block. The push block is fixedly connected to the top of the push rod, and the roller abuts against the end face of the cam.

[0027] In some embodiments, the end face of the cam further includes a cam start-stop section, a cam end-stop section, and a cam push-stroke quick-return section. The starting point of the cam push-stroke section is connected to the cam start-stop section, the ending point of the cam push-stroke section is connected to the cam end-stop section, and the cam push-stroke quick-return section connects the cam end-stop section and the cam start-stop section. The cam start-stop section and the cam end-stop section are both planes, and the cam push-stroke quick-return section is a vertical plane perpendicular to the plane.

[0028] Compared with the prior art, this utility model has significant advantages and beneficial effects. Through the above technical solution, the needle-free injector of this utility model achieves considerable technological advancement and practicality, and has broad industrial application value. It possesses at least the following advantages:

[0029] The nozzle of this needle-free injector features a one-way valve core, enabling unidirectional reagent flow during injection. This prevents external impurities and bacteria from entering the injector through the nozzle, effectively avoiding reagent contamination. The presence of at least one nozzle further enhances injection efficiency. A filter is added to the injector's inlet connector to effectively filter the reagent, preventing nozzle clogging and ensuring injection safety. Furthermore, the diaphragm one-way valve and filter are detachably connected to the inlet device, increasing the number of injections. The cam's end face design ensures a constant power output from the motor, preventing efficiency drops due to power fluctuations, smooth movement, low acceleration and impact, and low vibration and noise.

[0030] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the housing structure of the needleless injector according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the internal structure of the needleless injector according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the liquid inlet device of the needleless injector according to an embodiment of the present invention.

[0034] Figure 4 This is an exploded view of the diaphragm check valve according to an embodiment of the present invention.

[0035] Figure 5 This is a schematic diagram of the structure of the diaphragm check valve according to an embodiment of the present invention;

[0036] Figure 6 This is a cross-sectional structural diagram of the diaphragm check valve according to an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the reagent flow direction in the membrane check valve of this utility model embodiment;

[0038] Figure 8 This is a schematic diagram of the filter structure according to an embodiment of the present invention;

[0039] Figure 9 This is a cross-sectional structural diagram of the filter according to an embodiment of the present invention;

[0040] Figure 10 This is a schematic diagram of the nozzle installation position according to an embodiment of the present utility model;

[0041] Figure 11 This is a schematic diagram of the nozzle structure according to an embodiment of the present utility model;

[0042] Figure 12 This is a schematic diagram of the assembly structure of the cam and push rod assembly according to an embodiment of the present invention.

[0043] Symbol explanation:

[0044] 1. Housing; 10. Outer shell; 11. Display screen; 12. Button assembly; 13. Liquid inlet connector fixing nut; 14. Injection trigger sleeve; 15. Battery assembly;

[0045] 2. Injection drive mechanism; 20. Push rod assembly; 200. Guide plate; 201. Push rod; 202. Push block; 203. Roller; 21. Energy storage assembly; 210. Energy storage spring; 211. Connecting sleeve; 22. Drive assembly; 220. Drive motor; 221. Cam; 221.1. Cam push stroke section; 221.2. Cam initial dwell section; 221.3. Cam end dwell section; 221.4. Cam push stroke quick return section; 23. Base;

[0046] 3. Liquid inlet device; 30. Diaphragm check valve; 300. Valve body; 300.1. Valve port; 300.2. Valve seat surface; 300.3 First through hole; 300.4. Multi-faceted structure; 301. Diaphragm valve core; 301.1. Diaphragm support; 301.2. Diaphragm elastic element; 301.3. Diaphragm valve cover; 31. Liquid inlet conduit; 32. Liquid inlet connector; 33. Filter; 330. Filter body; 331. Conical ring; 332. Filter screen; 332.1. Coarse filter screen; 332.2. Medium filter screen; 332.3. Precision filter screen; 34. Pagoda-type pipe connector;

[0047] 4. Liquid storage device;

[0048] 5. Nozzle; 50. Nozzle body; 500. Reagent inlet; 51. Nozzle check valve; 510. Check valve core; 511. Elastic element; 512. Reagent outlet; 513. Second sealing ring; 52. Nozzle; 520. Spray hole; 521. Diverting channel; 53. First sealing ring. Detailed Implementation

[0049] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the specific implementation methods and effects of this utility model will be described in detail below with reference to the accompanying drawings and preferred embodiments.

[0050] Throughout this specification, references to terms such as "an embodiment," "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Therefore, the phrases "in one embodiment" or "in one embodiment" appearing in different places throughout this specification do not necessarily refer to the same embodiment. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] In the description of the embodiments of this application, the term "multiple" refers to two or more.

[0052] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this specification, and similarly, second may also be referred to as first.

[0053] Unless otherwise required by the content, throughout the following description and claims, the word “comprising” and its variations, such as “including”, shall be interpreted in an open-ended, inclusive sense, that is, as “including but not limited to”.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In one embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the needleless injector of this utility model includes: a shell 1, an injection drive mechanism 2, a liquid inlet device 3, a liquid storage device 4, and a nozzle 5.

[0056] The injection drive mechanism 2, the liquid inlet device 3, the liquid storage device 4, and the nozzle 5 are all housed inside the casing 1. One end of the liquid inlet device 3 is connected to the liquid storage device 4, and the other end is connected to an external reagent storage container. During injection, the needle-free injector draws the reagent stored in the external reagent storage container into the liquid storage device 4 through the liquid inlet device 3. The nozzle 5 is connected to the liquid storage device 4, and during injection, it sprays the reagent from the liquid storage device 4.

[0057] The injection drive mechanism 2 is connected to the liquid storage device 4. When the needleless injector draws in the reagent, the injection drive mechanism 2 creates a certain vacuum in the liquid storage device 4, which in turn creates a certain suction force. The reagent is then drawn into the liquid storage device 4 through the liquid inlet device 3. When the needleless injector injects, the injection drive mechanism 2 creates a certain high pressure in the liquid storage device 4. Under the action of this high pressure, the reagent in the liquid storage device 4 is sprayed out through the nozzle 5, completing the injection.

[0058] In one embodiment, the liquid storage device 4 is a metering plunger pump.

[0059] In one embodiment, such as Figure 3 As shown, the liquid inlet device 3 includes a diaphragm check valve 30, a liquid inlet conduit 31, and a liquid inlet connector 32.

[0060] The diaphragm check valve 30 and the inlet connector 32 are respectively connected to one end of the inlet conduit 31. Optionally, as shown... Figure 3 As shown, both the diaphragm check valve 30 and the inlet connector 32 are connected to the inlet conduit 31 via a pagoda-type pipe connector 34.

[0061] A diaphragm check valve 30 is connected to the liquid storage device 4, and the inlet connector 32 is used to connect to an external reagent storage container. When the needleless injector is injecting, the diaphragm check valve 30 is in the closed state, preventing reagents leaking from the liquid storage device 4 from flowing back into the inlet device 3, thereby preventing reagent backflow.

[0062] In one embodiment, such as Figures 4-7 As shown, the diaphragm check valve 30 includes a valve body 300 and a diaphragm valve core 301. A first through hole 300.3 is formed in the middle of the valve body 300. The first through hole 300.3 is formed along the axial direction of the valve body 300. A valve port 300.1 is formed on one end of the valve body 300.

[0063] like Figure 4 and Figure 5 As shown, a diaphragm valve core 301 is disposed at one end of the valve body 300 where a valve port 300.1 is formed. The diaphragm valve core 301 includes a diaphragm support portion 301.1, a diaphragm elastic element 301.2, and a diaphragm valve cover 301.3. The diaphragm support portion 301.1 is fixedly connected to the valve seat surface 300.2 at one end of the valve body 300. Preferably, the fixed connection between the diaphragm support portion 301.1 and the valve body 300 can be achieved by laser welding. One end of the diaphragm elastic element 301.2 is connected to the diaphragm support portion 301.1, and the other end is connected to the diaphragm valve cover 301.3, which covers the valve port 300.1 formed at one end of the valve body 300. The diameter of the diaphragm valve cover 301.3 is larger than the diameter of the valve port 300.1.

[0064] In one embodiment, such as Figure 5 As shown, the membrane support 301.1 has a circular structure, the membrane valve cover 301.3 is located at the center of the membrane support 301.1, and there are multiple membrane elastic elements 301.2, which are arc-shaped. The multiple arc-shaped membrane elastic elements 301.2 are located between the membrane support 301.1 and the membrane valve cover 301.3, and are evenly arranged along the outer periphery of the membrane valve cover 301.3.

[0065] Optionally, the membrane support 301.1, the membrane elastic element 301.2, and the membrane valve cover 301.3 are integrally formed structures, for example, integrally formed by injection molding or integrally formed by stamping.

[0066] In one embodiment, such as Figure 4 and Figure 5As shown, the outer circumferential surface of the valve body 300 of the diaphragm check valve 30 is threaded, and a similar thread is provided at the connection point between the liquid reservoir 4 and the diaphragm check valve 30. The diaphragm check valve 30 is detachably connected to the liquid reservoir 4 via these threads. In this embodiment, the detachable connection is achieved by forming threads on the outer circumferential surface of the valve body 300, allowing the diaphragm check valve 30 to be easily replaced after a failure, effectively increasing the number of injections possible with the needle-free injector.

[0067] In this embodiment, such as Figure 6 As shown, in order to facilitate the connection and disassembly of the diaphragm check valve 30 and the liquid storage device 4, a portion of the first through hole 300.3 formed inside the valve body 300 is configured as a multi-faceted structure 300.4, that is, at least a portion of the inner surface of the valve body 300 is a multi-faceted structure 300.4, so that a tool can be used to achieve a detachable connection between the diaphragm check valve 30 and the liquid storage device 4 through the multi-faceted structure 300.4.

[0068] Figure 6 The multifaceted structure 300.4 shown is a six-sided structure, which makes part of the first through hole 300.3 form an internal hexagonal hole. When installing or removing the diaphragm check valve 30, the operation can be completed by inserting an internal hexagonal wrench into the first through hole 300.3. Of course, the multifaceted structure 300.4 can also be a three-sided structure, a four-sided structure, a five-sided structure, etc., and this utility model is not limited to a specific number.

[0069] When the needle-free injector draws in the reagent, the injection drive mechanism 2 actuates, creating a certain vacuum within the reservoir 4. At this time, the pressure at the valve port 300.1 of the diaphragm check valve 30 is greater than the pressure on the side of the diaphragm valve cover 301.3 facing the reservoir 4. Under the action of this pressure difference, as... Figure 7 As shown, the valve cover of the membrane check valve 30 moves toward the liquid storage device 4, thereby creating a gap between the membrane valve core 301 and the valve port 300.1. The reagent flows into the liquid storage device 4 through the gap between the membrane valve core 301 and the valve port 300.1, thus completing one liquid aspiration process of the needleless injector.

[0070] When the needleless injector sprays reagents or performs cleaning, the injection drive mechanism 2 actuates, causing the pressure inside the liquid storage device 4 to increase. This results in the pressure on the side of the diaphragm valve cover 301.3 of the diaphragm check valve 30 facing the liquid storage device 4 being greater than the pressure at the valve port 300.1 of the diaphragm check valve 30. At this time, the diaphragm elastic element 301.2 and the diaphragm valve cover 301.3 reset, and the diaphragm valve cover 301.3 seals the valve port 300.1 to prevent reagent backflow.

[0071] In one embodiment, such as Figure 3As shown, a filter 33 is provided inside the liquid inlet connector 32 to filter impurities in the reagent that is drawn in.

[0072] like Figure 8 and Figure 9 As shown, the filter 33 includes a filter body 330, a conical ring 331, and a multi-stage filter screen 332. The filter body 330 is a hollow conical structure, and the conical ring 331 is made of an elastic material. The conical ring 331 is fitted around the outer periphery of the filter body 330. The elastic conical ring 331 ensures a tight seal between the filter 33 and the inlet connector 32. Furthermore, the conical design of the filter body 330 and the conical ring 331 facilitates the installation and removal of the filter 33, allowing for timely replacement of the filter 33 during use of the needle-free injector, thus ensuring effective filtration.

[0073] like Figure 9 As shown, the multi-stage filter screens 332 are sequentially arranged inside the filter body 330. Each stage of the multi-stage filter screen 332 has a different filtration precision, so as to achieve multiple filtration of reagents and ensure filtration effect.

[0074] Optionally, each stage of the multi-stage filter 332 can be a multi-layer filter structure, or some filters can be multi-layer filters and some filters can be single-layer filters. Of course, each stage of the filter can also be a single-layer filter structure.

[0075] Optionally, in the multi-stage filter screens 332, the precision of the filter screens 332 increases sequentially along the direction of reagent flow. Furthermore, a filtration gap is formed between each adjacent filter screen 332 to accommodate a certain amount of impurities, ensuring the service life of the filter 33. Preferably, the filtration gap decreases sequentially along the direction of reagent flow.

[0076] Figure 9 The diagram shows a three-stage filter 332, which, along the direction of reagent flow, consists of a coarse filter 332.1, a medium filter 332.2, and a fine filter 332.3. First, the coarse filter 332.1 filters out larger impurities, then the medium filter 332.2 filters out medium-sized impurities, and finally the fine filter 332.3 filters out small impurities.

[0077] In one embodiment, such as Figure 10 and Figure 11 As shown, the nozzle 5 includes a nozzle body 50, a nozzle one-way valve 51, and a nozzle 52. The nozzle 52 is detachably connected to the nozzle body 50 so that different nozzles 52 can be replaced according to actual usage requirements, such as a single-orifice nozzle 52 or a multi-orifice nozzle 52.

[0078] Optionally, the nozzle 52 and the nozzle body 50 can be detachably connected by a threaded connection or by a snap-fit ​​connection. A first sealing ring 53 is provided at the connection between the nozzle 52 and the nozzle body 50 to ensure the tightness of the connection between the nozzle 52 and the nozzle body 50.

[0079] like Figure 11 As shown, the nozzle body 50 is provided with a connected receiving cavity and a reagent inlet 500. The nozzle one-way valve 51 is located in the receiving cavity, and the reagent inlet 500 is connected to the liquid storage device 4.

[0080] Among them, such as Figure 11 As shown, the nozzle one-way valve 51 includes a one-way valve core 510 and an elastic element 511. The one-way valve core 510 is configured as a cavity structure, and the elastic element 511 is placed inside the cavity structure. A reagent outlet 512 is provided on the side wall of the one-way valve core 510, and the reagent outlet 512 is connected to the cavity structure. The nozzle 52 is provided with at least one spray hole 520, and the cavity structure is connected to the spray hole 520.

[0081] When the needleless injector is used for injection, the reagent in the liquid storage device 4 flows into the nozzle body 50 through the reagent inlet 500 under high pressure. After the high-pressure reagent acts on the one-way valve core 510, the elastic element 511 is compressed under the impact force, and a gap appears between the one-way valve core 510 and the reagent inlet 500. The reagent enters the nozzle body 50 through the gap and enters the cavity structure through the reagent outlet 512 provided on the side wall of the one-way valve core 510. Finally, the reagent is ejected through the spray hole 520 that communicates with the cavity structure.

[0082] In one embodiment, such as Figure 11 As shown, a second sealing ring 513 is provided between the one-way valve core 510 and the reagent inlet 500 to ensure the sealing between the nozzle body 50 and the liquid storage device 4 when the needleless injector is not injecting.

[0083] In one embodiment, Figure 11 The nozzle 52 shown has two injection holes 520 and a flow divider 521, which connects the cavity structure of the nozzle body 50 to the two injection holes 520 respectively. Of course, depending on the usage requirements, the nozzle 52 can also be provided with multiple injection holes 520, and all multiple injection holes 520 are connected to the flow divider 521.

[0084] In one embodiment, when the nozzle 52 has only one injection hole 520, the injection hole 520 is coaxially arranged with the cavity structure of the nozzle body 50.

[0085] In one embodiment, such as Figure 2 As shown, the injection drive mechanism 2 includes: a push rod assembly 20, an energy storage assembly 21, a drive assembly 22, and a base 23. The push rod assembly 20, energy storage assembly 21, and drive assembly 22 are all connected to the base 23. The drive assembly 22 is connected to the push rod assembly 20, and the energy storage assembly 21 is connected to the push rod assembly 20. The drive assembly 22 drives the push rod assembly 20 to move, and the movement of the push rod assembly 20 drives the energy storage assembly 21 to store energy.

[0086] In one embodiment, such as Figure 12 As shown, the push rod assembly 20 includes a guide plate 200 and a push rod 201. The guide plate 200 is disposed on one side of the base 23 and has a second through hole. The push rod 201 extends through the second through hole and out onto the other side of the base 23.

[0087] Optionally, the second through hole on the guide plate 200 is provided with a plurality of mounting slots in the circumferential direction, wherein the parameters of at least one mounting slot are different from the parameters of the remaining mounting slots, and the push rod 201 is provided with a plurality of protrusions in the circumferential direction, and the plurality of protrusions are configured to cooperate with the plurality of mounting slots one by one.

[0088] The parameters of the mounting slot include at least one of the dimensions, shape, and position of the mounting slot. Multiple protrusions are configured to mate with multiple mounting slots one-to-one, meaning that the number of protrusions is the same as the number of mounting slots, and the shape, size, and position of the protrusions are adapted to the shape, size, and position of the mounting slots.

[0089] like Figure 2 As shown, the energy storage component 21 includes an energy storage spring 210 and a connecting sleeve 211. The energy storage spring 210 is sleeved on the push rod 201 located on the other side of the base 23. The connecting sleeve 211 is sleeved on the outside of the energy storage spring 210, and the two ends of the connecting sleeve 211 are respectively connected to the base 23 and the liquid storage device 4.

[0090] When the drive assembly 22 drives the push rod 201 to move away from the liquid storage device 4, the energy storage spring 210 is sleeved on the push rod 201 on the other side of the base 23. As the push rod 201 moves, the energy storage spring 210 is compressed, thus storing energy.

[0091] In one embodiment, such as Figure 2 and Figure 12As shown, the drive assembly 22 includes a drive motor 220 and a cam 221. The drive motor 220 and the cam 221 are respectively disposed at both ends of the base 23. The drive motor 220 is used to drive the cam 221 to rotate. The end face of the cam 221 is used to push the push rod assembly 20 to move. The end face of the cam 221 includes a cam push segment 221.1. The contour line of the cam push segment 221.1 corresponds to the push curve. The increment of the push curve is in a decreasing relationship with the rotation angle of the cam 221. The velocity of the push rod 201 is inversely proportional to the spring force of the push rod assembly 20.

[0092] Optionally, the cam 221 has a cylindrical structure. The end face of the cam 221 is used to drive the push rod assembly 20 to move. The end face of the cam 221 includes a cam push segment 221.1. The contour line of the cam push segment 221.1 corresponds to the push curve. The increment of the push curve is in a decreasing relationship with the rotation angle of the cam 221. Furthermore, the velocity of the push rod 201 is inversely proportional to the spring force of the push rod 201 assembly 20.

[0093] Speed-like properties of push rod 201 ω is the angular velocity of cam 221, and v is the linear velocity of push rod 201.

[0094] Specifically, the stroke of cam 221 is y, the rotation angle of cam 221 is θ, and the stroke increment of cam 221 is Δy. Δy and θ have a decreasing relationship; that is, as the rotation angle of cam 221 increases from zero to its maximum value, the stroke increment per unit stroke angle gradually decreases. In other words, the slope of cam 221 gradually becomes gentler. Initially, the slope of cam 221 is steeper, and the movement speed of the push rod assembly 20 is faster. As the rotation angle of cam 221 gradually increases and the slope of cam 221 gradually becomes gentler, the movement speed of the push rod assembly 20 gradually slows down.

[0095] Since the increment of the push stroke is positively correlated with the speed of the push rod assembly 20, the push stroke increment is largest when the cam push stroke segment 221.1 just contacts the push rod assembly 20, resulting in the fastest movement speed of the push rod assembly 20. As the rotation angle of the cam 221 gradually increases, the increment of the cam 221's push stroke gradually decreases, meaning the movement speed of the push rod assembly 20 gradually slows down. Although the spring compression force is relatively large at this time, the power of the push rod assembly 20 remains essentially unchanged due to the slower speed of the push rod assembly 20. Therefore, the output power of the cam 221 and the output power of the drive motor 220 remain essentially unchanged. Thus, the push stroke curve in this invention enables the follower, i.e., the push rod assembly 20, to move with a constant power during the movement of the cam 221, allowing the drive motor 220 to provide a relatively stable power output during movement. This avoids a decrease in production efficiency due to power fluctuations, resulting in smooth movement, lower acceleration and impact forces, and lower vibration and noise.

[0096] The decrease in motor speed in this invention is not significant, and the decrease in cam speed 221 is also not significant. Therefore, the liquid aspiration time will not increase, and the number of injections within a fixed time period will not decrease.

[0097] In one embodiment, such as Figure 12 As shown, the end face of cam 221 includes a cam start-dwelling section 221.2, a cam end-dwelling section 221.3, and a cam push-stroke quick-return section 221.4. The starting point of the cam push-stroke section 221.1 is connected to the cam start-dwelling section 221.2, and the ending point of the cam push-stroke section 221.1 is connected to the cam end-dwelling section 221.3. The cam push-stroke quick-return section 221.4 connects the cam end-dwelling section 221.3 and the cam start-dwelling section 221.2. Both the cam start-dwelling section 221.2 and the cam end-dwelling section 221.3 are planar surfaces, while the cam push-stroke quick-return section 221.4 is a vertical surface perpendicular to the planar surface.

[0098] In one embodiment, such as Figure 12 As shown, the push rod assembly 20 also includes a push block 202 and a roller 203 rotatably connected to the push block 202. The push block 202 is fixedly connected to the top of the push rod 201, and the roller 203 abuts against the end face of the cam 221. Specifically, the roller 203 can be rotatably mounted on the push block 202 via a pin.

[0099] The edge of the push block 202 is rounded, and the shape of the push block 202 can be elephant trunk shaped. In this embodiment, the push block 202 is designed with near-uniform stiffness, and weight reduction is achieved by removing excess material through chamfering and rounding.

[0100] In one embodiment, the drive motor 220 includes a motor and a reducer, with the reducer disposed between the motor and the cam 221. The motor and the reducer together form a geared motor.

[0101] Optionally, "motor" refers to a micro motor. Of course, "motor" can also refer to a DC motor, a brushless DC motor, a stepper motor, an AC motor, an AC / DC servo motor, a permanent magnet synchronous motor, etc.

[0102] Optionally, the motor transmits power to the cam 221 via a transmission pin, causing the cam 221 to rotate.

[0103] In one embodiment, such as Figure 1 As shown, the housing 1 includes an outer shell 10, on which a display screen 11, a button group 12, an inlet connector fixing nut 13, an injection trigger sleeve 14, and a battery assembly 15 are provided.

[0104] The battery assembly 15 is used to provide power to the drive motor 220. Of course, the drive motor 220 can also be powered by an external power source, but this utility model is not limited thereto.

[0105] The nozzle of this needle-free injector features a one-way valve core, enabling unidirectional reagent flow during injection. This prevents external impurities and bacteria from entering the injector through the nozzle, effectively avoiding reagent contamination. The presence of at least one nozzle further enhances injection efficiency. A filter is added to the injector's inlet connector to effectively filter the reagent, preventing nozzle clogging and ensuring injection safety. Furthermore, the diaphragm one-way valve and filter are detachably connected to the inlet device, increasing the number of injections. The cam's end face design ensures a constant power output from the motor, preventing efficiency drops due to power fluctuations, smooth movement, low acceleration and impact, and low vibration and noise.

[0106] It should be noted that this application may include any feature or combination of features or generalization thereof implied or expressly disclosed herein, and is not limited to any of the foregoing limitations. Any elements, features and / or structural arrangements described herein may be combined in any suitable manner.

[0107] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A needleless injector characterized by, The application relates to a reagent injection device. The reagent injection device comprises a shell, an injection driving mechanism, a liquid inlet device, a liquid storage device and a nozzle, wherein the injection driving mechanism, the liquid inlet device, the liquid storage device and the nozzle are arranged in the shell. The liquid inlet device and the nozzle are connected to the liquid storage device, and the injection driving mechanism is connected to the liquid storage device, so as to suck reagent into the liquid storage device through the liquid inlet device and spray the reagent in the liquid storage device out through the nozzle. The nozzle comprises a nozzle body, a nozzle check valve and a nozzle head. The nozzle body is provided with a communicating accommodating cavity and a reagent inlet, and the nozzle check valve is arranged in the accommodating cavity. The nozzle check valve comprises a check valve core and an elastic member, the check valve core is provided with a cavity structure, the elastic member is arranged in the cavity structure, a reagent outlet is arranged on the side wall of the check valve core, and the reagent outlet is communicated with the cavity structure. The nozzle head is provided with at least one spray hole, and the cavity structure is communicated with the spray hole.

2. The needle-free injector of claim 1, wherein, The liquid inlet device comprises a diaphragm check valve, wherein the diaphragm check valve comprises a valve body provided with a first through hole and a diaphragm valve core arranged at one end of the valve body.

3. The needle-free injector of claim 2, wherein, The diaphragm valve core comprises a diaphragm support part, a diaphragm elastic member and a diaphragm valve cover.

4. The needle-free injector of claim 3, wherein, The diaphragm support part is fixedly connected to one end of the valve body, one end of the diaphragm elastic member is connected to the diaphragm support part, the other end of the diaphragm elastic member is connected to the diaphragm valve cover, and the diaphragm valve cover covers a valve port at one end of the valve body.

5. The needle-free injector of claim 2, wherein, The diaphragm support part is a circular ring, the diaphragm valve cover is arranged at the center of the diaphragm support part, the diaphragm elastic member is in a plurality of circular arc shapes, and the plurality of diaphragm elastic members are uniformly arranged along the outer periphery of the diaphragm valve cover. The diaphragm support part, the diaphragm elastic member and the diaphragm valve cover are integrally formed.

6. The needle-free injector according to any one of claims 2-5, wherein, The outer periphery of the valve body is provided with threads, and the diaphragm check valve is detachably connected to the liquid storage device through the threads. The inner surface of the valve body is provided with the first through hole with a multi-surface structure, so that the diaphragm check valve is detachably connected to the liquid storage device through the first through hole with the multi-surface structure by using a tool. The liquid inlet device further comprises a liquid inlet guide pipe and a liquid inlet connector.

7. The needle-free injector of claim 6, wherein, The liquid inlet connector is connected to one end of the liquid inlet guide pipe, and the diaphragm check valve is connected to the other end of the liquid inlet guide pipe. The liquid inlet connector is provided with a filter, and the filter comprises a filter body, an elastic conical ring and multi-stage filter screens. The filter body is a hollow conical structure, the conical ring is sleeved on the outer periphery of the filter body, the filter screens of the multi-stage filter screens have different filter accuracies, and the multi-stage filter screens are sequentially arranged in the filter body. In the flow direction of the reagent, the filter accuracies of the filter screens are sequentially improved, and a filter gap is arranged between every two adjacent filter screens. In the flow direction of the reagent, the filter gaps are sequentially reduced.

8. The needle-free injector of claim 1, wherein, The injection driving mechanism comprises a push rod assembly, an energy storage assembly, a driving assembly and a base, and the push rod assembly, the energy storage assembly and the driving assembly are connected to the base; The driving assembly is connected to the push rod assembly, the energy storage assembly is connected to the push rod assembly, the driving assembly drives the push rod assembly to act, and the push rod assembly drives the energy storage assembly to store energy.

9. The needle-free injector of claim 8, wherein, The push rod assembly comprises a guide plate and a push rod, the guide plate is arranged on one side of the base, the guide plate is provided with a second through hole, and the push rod extends out of the other side of the base through the second through hole; The energy storage assembly comprises an energy storage spring and a connecting sleeve, the energy storage spring is sleeved on the push rod on the other side of the base, the connecting sleeve is sleeved outside the energy storage spring, and the two ends of the connecting sleeve are connected to the base and the liquid storage device respectively.

10. The needle-free injector of claim 9, wherein, The second through hole is circumferentially provided with a plurality of mounting grooves, at least one of the mounting grooves has different parameters from the remaining mounting grooves, the push rod is circumferentially provided with a plurality of protrusions, and the plurality of protrusions are arranged one by one with the plurality of mounting grooves.

11. The needle-free injector according to any one of claims 8-10, wherein, The driving assembly comprises a driving motor and a cam, the driving motor and the cam are arranged at the two ends of the base respectively, the driving motor is used to drive the cam to rotate, the end face of the cam is used to push the push rod assembly to move, the end face comprises a cam push rod section, the contour line of the cam push rod section corresponds to a push rod curve, the increment of the push rod curve is in a decreasing relationship with the rotation angle of the cam, and the speed of the push rod is inversely proportional to the spring force of the push rod assembly; The push rod assembly further comprises a push block and a roller rotatably connected with the push block, the push block is fixedly connected to the top of the push rod, and the roller abuts against the end face of the cam.

12. The needle-free injector of claim 11, wherein, The end face of the cam further comprises a cam initial stay section, a cam terminal stay section and a cam push rod quick return section, the initial point of the cam push rod section is connected to the cam initial stay section, the terminal point of the cam push rod section is connected to the cam terminal stay section, the cam push rod quick return section connects the cam terminal stay section and the cam initial stay section, the cam initial stay section and the cam terminal stay section are both planes, and the cam push rod quick return section is a vertical plane perpendicular to the planes.

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