Needleless injector

Abstract

The needleless injector comprises a shell, an injection driving mechanism, a liquid inlet device, a liquid storage device and a spray head, the liquid inlet device and the spray head are both connected to the liquid storage device, and 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 liquid inlet device comprises a thin film one-way valve, the thin film one-way valve comprises a valve body with a first through hole and a thin film type valve element arranged at one end of the valve body, the thin film type valve element comprises a thin film type supporting part, a thin film type elastic piece and a thin film type valve cover, and the thin film type supporting part is fixedly connected to one end of the valve body; one end of the film type elastic piece is connected to the film type supporting part, the other end of the film type elastic piece is connected to the film type valve cover, and the film type valve cover is arranged at a valve port in one end of the valve body in a covering mode. According to the needle-free injector, the problems that reflux occurs in the needle-free injector, and the needle-free injector is single in application scene, short in service life, low in injection frequency and the like are effectively solved.

Description

Technical Field

[0001] The invention belongs to the field of medical devices, and in particular relates to a needle-free syringe. Background Art

[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 make the drug (liquid or lyophilized powder) in the syringe form a high-speed, high-pressure jet stream through the nozzle, thereby allowing the drug to penetrate the outer layer of the skin to the subcutaneous, intradermal and other tissue layers to release its efficacy.

[0003] Normally, the configuration of existing needle-free syringes cannot be changed. For example, the configuration of the nozzle cannot be changed, that is, a single-nozzle needle-free syringe cannot be converted into a multi-nozzle needle-free syringe, or the filter device of the needle-free syringe cannot be replaced. In addition, needle-free syringes usually do not have a liquid reflux prevention structure. Moreover, when the cam of the needle-free syringe pushes the push rod to gradually compress the linear motion energy storage spring to the maximum spring compression amount, the spring force also increases linearly, and the cam torque will also increase at the same time. According to the characteristics of the motor, the speed of the motor driving the cam will inevitably decrease, so that compared with the theoretical design, the number of continuous injections per minute of the needle-free syringe will decrease, and the motor speed will decrease too much, which will extend the drug absorption time of the syringe. Summary of the invention

[0004] The present invention provides a needle-free syringe to solve the problem of backflow during injection, as well as the problems of single application scenario, short service life and low injection frequency of the needle-free syringe.

[0005] In order to solve the above technical problems, the present invention provides a needle-free syringe, 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 arranged 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, and is used to suck the reagent into the liquid storage device through the liquid inlet device, and to eject the reagent in the liquid storage device through the nozzle;

[0007] The liquid inlet device includes a diaphragm one-way valve, wherein the diaphragm one-way valve includes a valve body with a first through hole and a diaphragm valve core arranged at one end of the valve body, the diaphragm valve core includes a diaphragm support portion, a diaphragm elastic member and a diaphragm valve cover, the diaphragm support portion is fixedly connected to one end of the valve body, one end of the diaphragm elastic member is connected to the diaphragm support portion, the other end of the diaphragm elastic member is connected to the diaphragm valve cover, and the diaphragm valve cover covers the valve port arranged at one end of the valve body.

[0008] In some embodiments, the film support portion is annular, the film valve cover is arranged at the center of the film support portion, there are multiple film elastic members, the film elastic members are arc-shaped, and the multiple film elastic members are evenly arranged along the outer circumference of the film valve cover.

[0009] In some embodiments, the film support portion, the film elastic member and the film valve cover are an integrally formed structure.

[0010] In some embodiments, a thread is formed on the circumferential surface of the valve body, and the film one-way valve is detachably connected to the liquid storage device via the thread;

[0011] The inner surface of the valve body forms the first through hole with a multi-faceted structure, so that a tool is used to pass through the first through hole with the multi-faceted structure to achieve a detachable connection between the film one-way valve and the liquid storage device.

[0012] In some embodiments, the liquid inlet device further comprises: a liquid inlet conduit and a liquid inlet connector;

[0013] The liquid inlet joint is connected to one end of the liquid inlet conduit, and the film one-way valve is connected to the other end of the liquid inlet conduit; a filter is arranged in the liquid inlet joint, and the filter comprises a filter body, an elastic conical ring and a multi-stage filter screen;

[0014] The filter body is a hollow conical structure, the conical ring is arranged on the outer periphery of the filter body, the filtering accuracy of each level of the multi-level filter screen is different, and the multi-level filter screens are sequentially arranged inside the filter body.

[0015] In some embodiments, along the flow direction of the reagent, the filtering accuracy of the filter mesh is gradually improved, and a filtering gap is arranged between each two adjacent filter meshes, and along the flow direction of the reagent, the filtering gap is gradually reduced.

[0016] In some embodiments, the spray head includes a spray head body, a spray head one-way valve, and a nozzle, and the nozzle is detachably connected to the spray head body;

[0017] Wherein, the nozzle body is provided with a communicating accommodation cavity and a reagent inlet, and the nozzle one-way valve is provided in the accommodation cavity;

[0018] The nozzle one-way valve comprises a one-way valve core and an elastic member, wherein the one-way valve core is arranged as a cavity structure, the elastic member is arranged in the cavity structure, a reagent outlet is arranged on the side wall of the one-way valve core, and the reagent outlet is connected to the cavity structure;

[0019] The nozzle is provided with at least one injection hole, and the cavity structure is connected to the injection hole.

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

[0021] Wherein, the driving assembly is connected to the pushing rod assembly, the energy storage assembly is connected to the pushing rod assembly, the driving assembly drives the pushing rod assembly to move, and the movement of the pushing 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, wherein the guide plate is disposed on one side of the base, a second through hole is disposed on the guide plate, and the push rod extends through the second through hole to the other side of the base;

[0023] The energy storage assembly 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 circumferentially provided with a plurality of mounting grooves, wherein parameters of at least one of the mounting grooves are different from parameters of the remaining mounting grooves, and the push rod is circumferentially provided with a plurality of protrusions, and the plurality of protrusions are matched with the plurality of mounting grooves one by one.

[0025] In some embodiments, the driving assembly includes a driving motor and a cam, the driving motor and the cam are respectively arranged at two ends of the base, the driving motor is used to drive the cam to rotate, the end surface of the cam is used to push the push rod assembly to move, the end surface includes a cam push segment, the contour line of the cam push segment corresponds to a push curve, the push 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 also 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 surface of the cam.

[0027] In some embodiments, the end surface of the cam also includes a cam starting 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 starting stop section, the end point of the cam push stroke section is connected to the cam end stop section, the cam push stroke quick return section connects the cam end stop section and the cam starting stop section, the cam starting 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, the present invention has obvious advantages and beneficial effects. By means of the above technical solution, the needle-free syringe of the present invention can achieve considerable technical advancement and practicality, and has wide industrial utilization value, and has at least the following advantages:

[0029] The addition of a thin film one-way valve in the liquid inlet device of the needle-free syringe of the present invention can effectively prevent backflow during the injection process of the needle-free syringe. The addition of a filter in the liquid inlet joint of the needle-free syringe can effectively filter the reagent, which can effectively prevent the nozzle from being blocked by impurities on the one hand, and ensure the safety of the injection on the other hand. Furthermore, the thin film one-way valve and the filter of the present invention are both configured to be detachably connected to the liquid inlet device, which can effectively increase the number of injections of the needle-free syringe. The design of the end face of the cam of the present invention enables the push rod assembly to move at a constant power rate, which can enable the motor to provide a relatively stable power output during the movement, avoid the decrease in production efficiency due to power fluctuations, and have smooth movement, small acceleration and impact force, and low vibration and noise.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the housing structure of the needle-free syringe according to an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the internal structure of a needle-free syringe according to an embodiment of the present invention;

[0033] Figure 3 It is a structural schematic diagram of a liquid inlet device of a needle-free syringe according to an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of the exploded structure of a film one-way valve according to an embodiment of the present invention;

[0035] Figure 5A schematic structural diagram of a thin film one-way valve according to an embodiment of the present invention;

[0036] Figure 6 is a schematic cross-sectional structure diagram of a thin film one-way valve according to an embodiment of the present invention;

[0037] Figure 7 A schematic diagram of the flow direction of reagents in a thin film one-way valve according to an embodiment of the present invention;

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

[0039] Fig. 9 is a schematic cross-sectional structure diagram of a filter according to an embodiment of the present invention;

[0040] Fig.10 A schematic diagram of the installation position of a nozzle according to an embodiment of the present invention;

[0041] Fig.11 A schematic diagram of the structure of a nozzle according to an embodiment of the present invention;

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

[0043] Explanation of symbols:

[0044] 1. Shell; 10. Outer shell; 11. Display screen; 12. Button group; 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 section; 221.2. Cam start stop section; 221.3. Cam end stop section; 221.4. Cam push quick return section; 23. Base;

[0046] 3. Liquid inlet device; 30. Membrane one-way valve; 300. Valve body; 300.1. Valve port; 300.2. Valve seat surface; 300.3. First through hole; 300.4. Multi-faceted structure; 301. Membrane valve core; 301.1. Membrane support portion; 301.2. Membrane elastic member; 301.3. Membrane 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. Fine filter screen; 34. Pagoda-type pipe connector;

[0047] 4. Liquid storage device;

[0048] 5. Nozzle; 50. Nozzle body; 500. Reagent inlet; 51. Nozzle one-way valve; 510. One-way valve core; 511. Elastic member; 512. Reagent outlet; 513. Second sealing ring; 52. Nozzle; 520. Spray hole; 521. Diverter channel; 53. First sealing ring. DETAILED DESCRIPTION

[0049] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0050] Throughout the description of this specification, reference to the terms "an embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Thus, the phrases "in one embodiment" or "in an embodiment" appearing in different places throughout this specification do not necessarily all refer to the same embodiment. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0051] In the description of the embodiments of the present application, the term "plurality" 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 the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0053] Unless required by content, throughout the following description and claims, the word "include" and variations such as "comprises" are to be interpreted in an open, inclusive sense, that is, as "including but not limited to."

[0054] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0055] In one embodiment of the present invention, Figure 1 and Figure 2 As shown, the needle-free syringe of the present invention comprises: a housing 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 arranged inside the housing 1. One end of the liquid inlet device 3 is connected to the liquid storage device 4, and the other end of the liquid inlet device 3 is used to connect to an external reagent storage container. During the injection process, the needle-free injector sucks 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 the injection process, the reagent in the liquid storage device 4 is ejected through the nozzle 5.

[0057] The injection drive mechanism 2 is connected to the liquid storage device 4. When the needle-free syringe inhales the reagent, the injection drive mechanism 2 forms a certain vacuum degree in the liquid storage device 4, so that the liquid storage device 4 forms a certain suction force, and the reagent is sucked into the liquid storage device 4 through the liquid inlet device 3; when the needle-free syringe is injected, the injection drive mechanism 2 forms a certain high pressure in the liquid storage device 4. Under the action of the high pressure, the reagent in the liquid storage device 4 is sprayed out through the nozzle 5 to complete the injection.

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

[0059] In one embodiment, if Figure 3 As shown, the liquid inlet device 3 includes a film one-way valve 30 , a liquid inlet conduit 31 and a liquid inlet connector 32 .

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

[0061] The film one-way valve 30 is connected to the liquid storage device 4, and the liquid inlet connector 32 is used to connect to an external reagent storage container. When the needle-free syringe is used for injection, the film one-way valve 30 is in a closed state, so that the reagent leaked from the liquid storage device 4 cannot flow back into the liquid inlet device 3, thereby preventing the reagent from flowing back.

[0062] In one embodiment, if Figure 4-Figure 7 As shown, the film one-way valve 30 includes a valve body 300 and a film valve core 301, wherein a first through hole 300.3 is formed in the middle of the valve body 300, and the first through hole 300.3 is formed along the axial direction of the valve body 300, and a valve port 300.1 is formed on one end of the valve body 300.

[0063] like Figure 4 and Figure 5As shown, the film valve core 301 is arranged at one end of the valve body 300 where the valve port 300.1 is formed. The film valve core 301 includes a film support portion 301.1, a film elastic member 301.2 and a film valve cover 301.3. The film support portion 301.1 is fixedly connected to the valve seat surface 300.2 at one end of the valve body 300. Preferably, the film support portion 301.1 and the valve body 300 can be fixedly connected by laser welding. One end of the film elastic member 301.2 is connected to the film support portion 301.1, and the other end is connected to the film valve cover 301.3, and the film valve cover 301.3 is covered on the valve port 300.1 formed at one end of the valve body 300. The diameter of the film valve cover 301.3 is larger than the diameter of the valve port 300.1.

[0064] In one embodiment, if Figure 5 As shown, the film support portion 301.1 is a circular ring structure, the film valve cover 301.3 is arranged at the center of the film support portion 301.1, the number of the film elastic members 301.2 is multiple, and the multiple film elastic members 301.2 are arc-shaped structures, and the multiple arc-shaped film elastic members 301.2 are arranged between the film support portion 301.1 and the film valve cover 301.3, and are evenly arranged along the outer periphery of the film valve cover 301.3.

[0065] Optionally, the film support portion 301.1, the film elastic member 301.2 and the film valve cover 301.3 are an integrally formed structure, for example, integrally formed by an injection molding process, or integrally formed by a stamping process, etc.

[0066] In one embodiment, if Figure 4 and Figure 5 As shown, a thread is formed on the outer circumferential surface of the valve body 300 of the film check valve 30, and a thread is also provided at the position where the liquid storage device 4 is connected to the film check valve 30, and the film check valve 30 is detachably connected to the liquid storage device 4 through the thread. In this embodiment, the detachable connection is achieved by forming a thread on the outer circumferential surface of the valve body 300, so that the film check valve 30 can be smoothly replaced after a failure occurs, effectively improving the injection times of the needle-free syringe.

[0067] In this embodiment, if Figure 6 As shown, in order to facilitate the connection and disassembly of the membrane one-way valve 30 and the liquid storage device 4, a portion of the first through hole 300.3 formed inside the valve body 300 is set 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 membrane one-way valve 30 and the liquid storage device 4 through the multi-faceted structure 300.4.

[0068] Figure 6 The multi-faceted structure 300.4 shown is a six-faceted structure, so that part of the first through hole 300.3 is formed as a hexagonal hole, and when installing or removing the membrane one-way valve 30, an hexagonal wrench can be inserted into the first through hole 300.3 to complete the operation. Of course, the multi-faceted structure 300.4 can also be a three-faceted structure, a four-faceted structure, a five-faceted structure, etc., and the present invention is not limited to a specific number.

[0069] When the needle-free syringe inhales the reagent, the injection drive mechanism 2 is actuated to form a certain vacuum degree in the liquid storage device 4. At this time, the pressure at the valve port 300.1 of the film check valve 30 is greater than the pressure on the side of the film valve cover 301.3 of the film check valve 30 facing the liquid storage device 4. Under the action of the pressure difference, Figure 7 As shown, the valve cover of the film one-way valve 30 will move toward the liquid storage device 4, thereby causing a gap to appear between the film valve core 301 and the valve port 300.1, and the reagent will flow into the liquid storage device 4 through the gap between the film valve core 301 and the valve port 300.1, thus completing a liquid aspiration process of the needle-free syringe.

[0070] When the needle-free syringe is spraying reagent or cleaning, the injection drive mechanism 2 is actuated to increase the pressure in the liquid storage device 4, thereby making the pressure on the side of the membrane valve cover 301.3 of the membrane one-way valve 30 facing the liquid storage device 4 greater than the pressure at the valve port 300.1 of the membrane one-way valve 30. At this time, the membrane elastic member 301.2 and the membrane valve cover 301.3 are reset, and the membrane valve cover 301.3 blocks the valve port 300.1 to prevent the reagent from flowing back.

[0071] In one embodiment, if Figure 3 As shown, a filter 33 is provided in the liquid inlet connector 32 to filter impurities in the inhaled reagent through the filter 33 .

[0072] like Figure 8 and Fig. 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, the conical ring 331 is made of elastic material, and the conical ring 33 is sleeved on the outer periphery of the filter body 330. The elastic conical ring 331 can ensure the tightness between the filter 33 and the liquid inlet connector 32, and the filter body 330 and the conical ring 331 are designed as a conical structure, which can facilitate the installation and removal of the filter 33, so that during the use of the needle-free syringe, the filter 33 can be replaced in time to ensure the filtering effect.

[0073] like Fig. 9As shown, the multi-stage filter screens 332 are sequentially arranged inside the filter body 330 , and the filtering accuracy of each stage of the filter screen in the multi-stage filter screen 332 is different, so as to achieve multiple filtering of the reagent and ensure the filtering effect.

[0074] Optionally, each filter level in the multi-level filter 332 may be a multi-layer filter structure, or some filters may be a multi-layer filter structure and some filters may be a single-layer filter structure. Of course, each filter level may be a single-layer filter structure.

[0075] Optionally, in the multi-stage filter screen 332, the precision of the filter screen 332 increases successively along the direction in which the reagent flows. A filter gap is formed between each adjacent filter screen 332 so that a certain amount of impurities can be accommodated through the filter gap to ensure the service life of the filter 33. Preferably, the filter gap decreases successively along the direction in which the reagent flows.

[0076] Fig. 9 The three-stage filter 332 is shown in the figure. Along the direction of the reagent flowing through, the three-stage filter 332 is respectively a coarse filter 332.1, a medium filter 332.2 and a precision 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 precision filter 332.3 filters out fine impurities.

[0077] In one embodiment, if Fig.10 and Fig.11 As shown, the nozzle 5 includes a nozzle body 50, a nozzle check 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 use requirements, for example, a nozzle 52 with a single injection hole or a nozzle 52 with multiple injection holes can be replaced.

[0078] Optionally, the nozzle 52 and the nozzle body 50 can be detachably connected by threaded connection or by clamping. 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 Fig.11 As shown, the nozzle body 50 is provided with a communicating accommodation cavity and a reagent inlet 500 , a nozzle one-way valve 51 is arranged in the accommodation cavity, and the reagent inlet 500 is communicated with the liquid storage device 4 .

[0080] Among them, Fig.11As shown, the nozzle one-way valve 51 includes a one-way valve core 510 and an elastic member 511. The one-way valve core 510 is configured as a cavity structure, and the elastic member 511 is placed in 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. At least one injection hole 520 is provided on the nozzle 52, and the cavity structure is connected to the injection hole 520.

[0081] When the needle-free syringe is used for injection, the reagent in the liquid storage device 4 flows into the nozzle body 50 through the reagent inlet 500 under the action of high pressure. After the high-pressure reagent acts on the one-way valve core 510, the elastic member 511 is compressed under the action of 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, and finally the reagent is ejected through the injection hole 520 connected to the cavity structure.

[0082] In one embodiment, if Fig.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 needle-free injector is not injecting.

[0083] In one embodiment, Fig.11 The nozzle 52 shown in the figure has two injection holes 520, and the nozzle 52 is provided with a flow diversion channel 521, which respectively connects the cavity structure of the nozzle body 50 with the two injection holes 520. Of course, according to the use requirements, the injection hole 520 on the nozzle 52 can also be set to multiple, and the multiple injection holes 520 are all connected to the flow diversion channel 521.

[0084] In one embodiment, when there is one spray hole 520 on the nozzle 52 , the one spray hole 520 and the cavity structure of the nozzle body 50 are coaxially arranged.

[0085] In one embodiment, if 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. Among them, the push rod assembly 20, the energy storage assembly 21 and the drive assembly 22 are all connected to the base 23, the drive assembly 22 is connected to the push rod assembly 20, 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 push rod assembly 20 drives the energy storage assembly 21 to store energy.

[0086] In one embodiment, if Fig.12As shown, the push rod assembly 20 includes a guide plate 200 and a push rod 201. The guide plate 200 is arranged on one side of the base 23. A second through hole is provided on the guide plate 200. The push rod 201 extends through the second through hole to the other side of the base 23.

[0087] Optionally, a plurality of mounting grooves are arranged circumferentially of the second through hole on the guide plate 200, wherein parameters of at least one mounting groove are different from parameters of the remaining mounting grooves, and a plurality of protrusions are arranged circumferentially of the push rod 201, and the plurality of protrusions are arranged one by one with the plurality of mounting grooves.

[0088] The parameters of the mounting groove include at least one of the size, shape and position of the mounting groove. The multiple protrusions are arranged in a one-to-one manner with the multiple mounting grooves, which means that the number of the protrusions is the same as the number of the mounting grooves, and the shape, size and position of the protrusions are adapted to the shape, size and position of the mounting grooves.

[0089] like Figure 2 As shown, the energy storage assembly 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 driving assembly 22 drives the push rod 201 to move in a direction away from the liquid storage device 4, since 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 to achieve energy storage.

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

[0093] The speed of the push rod 201 ω is the angular velocity of the cam 221 , and v is the linear moving velocity of the push rod 201 .

[0094] Specifically, the push stroke of the cam 221 is y, the rotation angle of the cam 221 is θ, and the push stroke increment of the cam 221 is △y, wherein △y and θ are in a decreasing relationship, that is, in the process of the rotation angle of the cam 221 from zero to the maximum value, the push stroke increment corresponding to the unit push stroke angle gradually decreases, in other words, the slope of the cam 221 gradually slows down. At the beginning, the slope of the cam 221 is steeper, and the movement speed of the push stroke rod assembly 20 is faster. When the rotation angle of the cam 221 gradually increases, the slope of the cam 221 gradually slows down, and the movement speed of the push stroke rod assembly 20 gradually slows down.

[0095] Since the increment of the push stroke is positively correlated with the speed of the push stroke rod assembly 20, when the cam push stroke section 221.1 just contacts the push stroke rod assembly 20, the increment of the push stroke is the largest, so the movement speed of the push stroke rod assembly 20 is the fastest. As the rotation angle of the cam 221 gradually increases, the increment of the push stroke of the cam 221 gradually decreases, that is, the movement speed of the push stroke rod assembly 20 gradually slows down. At this time, although the compression force of the spring is large, due to the slow speed of the push stroke rod assembly 20, the power of the push stroke rod assembly 20 remains basically unchanged, that is, the output power of the cam 221 remains basically unchanged, and the output power of the drive motor 220 remains unchanged. Therefore, the push stroke curve in the present invention can make the follower, that is, the push stroke rod assembly 20, move according to the law of constant power during the movement of the cam 221, and can make the drive motor 220 provide relatively stable power output during the movement, avoiding the decrease in production efficiency due to power fluctuations, and the movement is smooth, the acceleration and impact force are small, and the vibration and noise are low.

[0096] The motor speed in the present invention does not drop significantly, and the speed of the cam 221 also does not drop significantly. 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, if Fig.12 As shown, the end surface of the cam 221 includes a cam starting stop section 221.2, a cam end stop 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 starting stop section 221.2, the end point of the cam push stroke section 221.1 is connected to the cam end stop section 221.3, and the cam push stroke quick return section 221.4 connects the cam end stop section 221.3 and the cam starting stop section 221.2. The cam starting stop section 221.2 and the cam end stop section 221.3 are both planes, and the cam push stroke quick return section 221.4 is a vertical surface perpendicular to the plane.

[0098] In one embodiment, if Fig.12As 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 surface of the cam 221. Specifically, the roller 203 can be rotatably arranged on the push block 202 by a pin shaft.

[0099] The edge of the push block 202 is provided with a rounded structure, and the shape of the push block 202 can be an elephant trunk shape. In this embodiment, the push block 202 is close to a uniform rigidity design, and weight reduction is achieved by removing excess material through edge chamfering and rounding.

[0100] In one embodiment, the driving motor 220 includes a motor and a reducer, and the reducer is disposed between the motor and the cam 221. The motor and the reducer constitute a reduction motor.

[0101] Optionally, the motor refers to a micromotor. Of course, the 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, driving the cam 221 to rotate.

[0103] In one embodiment, if Figure 1 As shown, the housing 1 includes an outer shell 10 , on which a display screen 11 , a button group 12 , a liquid 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 electrical energy to the driving motor 220. Of course, the driving motor 220 may also be powered by an external power supply, but the present invention is not limited thereto.

[0105] It is still necessary to remind that the present application may include any feature or feature combination or generalization disclosed herein, whether implicitly or explicitly, and is not limited to any of the limited scopes listed above. Any elements, features and / or structural arrangements described herein may be combined in any suitable manner.

[0106] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A needle-free syringe, characterized in that: include: 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 arranged inside the housing; 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, and is used to suck the reagent into the liquid storage device through the liquid inlet device, and to eject the reagent in the liquid storage device through the nozzle; The liquid inlet device includes a diaphragm one-way valve, wherein the diaphragm one-way valve includes a valve body with a first through hole and a diaphragm valve core arranged at one end of the valve body, the diaphragm valve core includes a diaphragm support portion, a diaphragm elastic member and a diaphragm valve cover, the diaphragm support portion is fixedly connected to one end of the valve body, one end of the diaphragm elastic member is connected to the diaphragm support portion, the other end of the diaphragm elastic member is connected to the diaphragm valve cover, and the diaphragm valve cover covers the valve port arranged at one end of the valve body.

2. The needle-free injector according to claim 1, characterized in that: The film support portion is annular, the film valve cover is arranged at the center of the film support portion, there are multiple film elastic members, the film elastic members are arc-shaped, and the multiple film elastic members are evenly arranged along the outer circumference of the film valve cover.

3. The needle-free injector according to claim 2, characterized in that: The film-type support portion, the film-type elastic member and the film-type valve cover are an integrally formed structure.

4. The needle-free injector according to claim 1, characterized in that: A thread is formed on the peripheral surface of the valve body, and the film one-way valve is detachably connected to the liquid storage device via the thread; The inner surface of the valve body forms the first through hole with a multi-faceted structure, so that a tool is used to pass through the first through hole with the multi-faceted structure to achieve a detachable connection between the film one-way valve and the liquid storage device.

5. The needle-free injector according to any one of claims 1 to 4, characterized in that: The liquid inlet device also includes: a liquid inlet conduit and a liquid inlet joint; The liquid inlet joint is connected to one end of the liquid inlet conduit, and the film one-way valve is connected to the other end of the liquid inlet conduit; a filter is arranged in the liquid inlet joint, and the filter comprises a filter body, an elastic conical ring and a multi-stage filter screen; The filter body is a hollow conical structure, the conical ring is arranged on the outer periphery of the filter body, the filtering accuracy of each level of the multi-level filter screen is different, and the multi-level filter screens are sequentially arranged inside the filter body.

6. The needle-free injector according to claim 5, characterized in that: Along the flow direction of the reagent, the filtering accuracy of the filter screen increases successively, and a filtering gap is arranged between each two adjacent filter screens. Along the flow direction of the reagent, the filtering gap decreases successively.

7. The needle-free injector according to claim 1, characterized in that: The spray head comprises a spray head body, a spray head one-way valve and a nozzle, and the nozzle is detachably connected to the spray head body; Wherein, the nozzle body is provided with a communicating accommodation cavity and a reagent inlet, and the nozzle one-way valve is provided in the accommodation cavity; The nozzle one-way valve comprises a one-way valve core and an elastic member, wherein the one-way valve core is arranged as a cavity structure, the elastic member is arranged in the cavity structure, a reagent outlet is arranged on the side wall of the one-way valve core, and the reagent outlet is connected to the cavity structure; The nozzle is provided with at least one injection hole, and the cavity structure is connected to the injection hole.

8. The needle-free injector according to claim 1, characterized in that: The injection drive mechanism comprises 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; Wherein, the driving assembly is connected to the pushing rod assembly, the energy storage assembly is connected to the pushing rod assembly, the driving assembly drives the pushing rod assembly to move, and the movement of the pushing rod assembly drives the energy storage assembly to store energy.

9. The needle-free injector according to claim 8, characterized in that: The push rod assembly comprises a guide plate and a push rod, wherein the guide plate is arranged on one side of the base, a second through hole is arranged on the guide plate, and the push rod passes through the second through hole and extends out to the other side of the base; The energy storage assembly 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.

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

11. The needle-free injector according to any one of claims 8 to 10, characterized in that: The driving assembly includes a driving motor and a cam, the driving motor and the cam are respectively arranged at two ends of the base, the driving motor is used to drive the cam to rotate, the end surface of the cam is used to push the push rod assembly to move, the end surface includes a cam push segment, the contour line of the cam push segment corresponds to a push curve, the push 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; The push rod assembly also 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 surface of the cam.

12. The needle-free injector according to claim 11, characterized in that: The end surface of the cam also includes a cam starting 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 starting stop section, the end point of the cam push stroke section is connected to the cam end stop section, the cam push stroke quick return section connects the cam end stop section and the cam starting stop section, the cam starting 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.

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