Needleless injector

Abstract

The present disclosure provides a needle-free injector, which comprises a drug liquid chamber, a semi-spherical diaphragm and a driving liquid chamber; the semi-spherical diaphragm is clamped between the drug liquid chamber and the driving liquid chamber; the semi-spherical diaphragm is used to isolate the drug in the drug liquid chamber and the driving liquid in the driving liquid chamber, and is also used to transmit the driving force generated by the driving liquid chamber to the drug liquid chamber; the drug liquid chamber is used to store the drug to be injected; and the driving liquid chamber is used to store the driving liquid to provide pressure for the needle-free injector. The present disclosure isolates the drug in the drug liquid chamber and the driving liquid in the driving liquid chamber through the semi-spherical diaphragm, thereby preventing the risk of mixed contamination of the drug and the driving liquid. Meanwhile, when the driving force is generated by ionization of the driving liquid, the semi-spherical diaphragm is subjected to repeated stress more uniformly than the ordinary diaphragm, thereby reducing the risk of cracking of the diaphragm due to repeated stress deformation and increasing the service life of the diaphragm.

Description

Technical Field

[0001] This disclosure relates to the field of medical device technology, and more particularly to a needleless injector. Background Technology

[0002] Needle-free injection technology (NFIT) uses the principle of pressure jet to administer medication subcutaneously. For example... Figure 1 and Figure 2 As shown, the pressure generated by the internal pressure device of the needle-free injector forces the liquid medication in the tube through micropores to form a liquid column, allowing the liquid medication to instantly penetrate the epidermis and reach the subcutaneous layer, where it is absorbed in a diffuse manner. The injection process of the optically driven needle-free injector is as follows... Figure 3 As shown, the laser is first focused through a lens onto a liquid-filled driving chamber to form plasma. The plasma absorbs energy and generates bubbles, which then grow and form a jet stream. Finally, the bubbles in the drug chamber of the needle-free injector disappear, and the liquid returns to stillness. Existing needle-free injectors have complex structures, high failure rates, and low production efficiency. Furthermore, as consumables, they are costly, placing a burden on patients. Additionally, existing needle-free injectors lack precise control over injection volume, have long driving force generation times, and exhibit uneven injection force, excessive splashing, and waste of injectable material. Moreover, the large single injection volume of existing needle-free injectors can lead to excessive cavitation damage to the skin surface, requiring a recovery period. The excessively concentrated local drug concentration also hinders skin absorption. Finally, the detachable needle-free injector head may easily contaminate the driving fluid and drug solution inside, creating a risk of misuse. Reusing needle-free injectors can also lead to mixing of different types of drugs, and different patients using the same needle-free injector head, resulting in adverse drug reactions and cross-infection risks. Summary of the Invention

[0003] The technical problem to be solved by this disclosure is to overcome the shortcomings of the prior art, such as the short lifespan of the diaphragm due to cracking and damage caused by reciprocating vibration, which leads to contamination of the injected drug solution by the driving fluid after long-term use of the needle-free injector, and to provide a needle-free injector.

[0004] This disclosure solves the above-mentioned technical problems through the following technical solution: This disclosure provides a needle-free injector, which includes: a drug chamber, a hemispherical diaphragm, and a driving liquid chamber; The hemispherical diaphragm is sandwiched between the drug chamber and the driving liquid chamber; The hemispherical diaphragm is used to separate the drug in the drug chamber from the driving fluid in the driving fluid chamber; it is also used to transmit the driving force generated by the driving fluid chamber to the drug chamber; the drug chamber is used to store the drug to be injected; the driving fluid chamber is used to store the driving fluid and provide pressure for the needle-free injector.

[0005] Preferably, the driving liquid chamber includes a driving liquid chamber groove; the driving liquid chamber groove is coupled and matched with the hemispherical diaphragm; The hemispherical diaphragm is disposed within the groove of the driving liquid chamber.

[0006] Preferably, the edge of the hemispherical diaphragm is provided with sealing ribs; the sealing ribs are used to prevent leakage of the driving fluid and the drug.

[0007] Preferably, the hemispherical diaphragm is made of a soft rubber material; wherein the soft rubber material includes rubber-based materials or silicone rubber-based materials.

[0008] Preferably, the needle-free injector further includes a housing; the housing includes a guide groove; the driving liquid chamber includes a first side boss corresponding to the guide groove; and the drug liquid chamber includes a second side boss corresponding to the guide groove. The driving liquid chamber is disposed inside the outer shell along the guide groove via the first side boss; the medicine chamber is disposed inside the outer shell along the guide groove via the second side boss; the medicine chamber, the hemispherical diaphragm, and the driving liquid chamber are sequentially stacked inside the outer shell.

[0009] Preferably, the needle-free injector further includes a housing; the housing includes a multi-start internal thread; the drive liquid chamber includes a first multi-start external thread corresponding to the multi-start internal thread; and the drug liquid chamber includes a second multi-start external thread corresponding to the multi-start internal thread. The liquid chamber, the hemispherical diaphragm, and the driving liquid chamber are sequentially stacked inside the outer shell; the driving liquid chamber and the outer shell are threadedly connected by the multi-start internal thread and the first multi-start external thread; the liquid chamber and the outer shell are threadedly connected by the multi-start internal thread and the second multi-start external thread.

[0010] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this disclosure.

[0011] The positive and progressive effects of this disclosure are as follows: This disclosure uses a hemispherical diaphragm to separate the drug in the drug solution chamber from the driving fluid in the driving fluid chamber, preventing the risk of drug and driving fluid mixing and contamination. Simultaneously, when the driving fluid ionizes to generate driving force, the hemispherical diaphragm experiences more uniform stress than a conventional diaphragm, reducing the risk of cracking due to repeated stress deformation and increasing the diaphragm's service life. Attached Figure Description

[0012] Figure 1 The first principle diagram of injection for existing needle-free injectors; Figure 2 The second principle diagram for injection of existing needle-free injectors; Figure 3 The third principle diagram for injection of existing needle-free injectors; Figure 4 This is a schematic diagram of the structure of a needle-free injector provided in Embodiment 1 of this disclosure; Figure 5 A needleless injector and its exploded view, which are specific examples of a needleless injector provided in Embodiment 1 of this disclosure; Figure 6 A product diagram of an electrically erasable programmable read-only memory chip for a needleless injector, a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 7 A schematic diagram of the electrically erasable programmable read-only memory chip structure of a needleless injector, which is a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 8 A schematic diagram of the outer casing structure of a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 9 A connector structure diagram of a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 10 A structural diagram of the driving liquid chamber of a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 11 A diaphragm structure diagram of a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 12 A schematic diagram of the drug chamber structure of a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 13 A diagram showing the structure of a duckbill valve, which is a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 14 A nozzle structure diagram of a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 15 A schematic diagram of the drug input interface structure of a specific example of a needleless injector provided in Embodiment 1 of this disclosure; Figure 16 This is a schematic diagram of the internal structure of a needleless injector housing, which is a specific example of a needleless injector provided in Embodiment 1 of this disclosure. Detailed Implementation

[0013] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0014] The prefixes such as "first" and "second" used in this disclosure are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this disclosure does not constitute a limitation on the described objects. The description of the described objects is given in the claims or the context of the embodiments, and should not be construed as an unnecessary limitation. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0015] Example 1

[0016] The needle-free injector in this embodiment uses an optical force-driven method. Its function is to use the energy of a pulsed laser to generate kinetic energy in the driving fluid, forming a driving force that creates pressure in the drug chamber, thereby squeezing the drug out of the nozzle and spraying it into the skin tissue.

[0017] This embodiment provides a needleless injector, see [link / reference] Figure 4 The needle-free injector includes: a drug chamber 0207, a hemispherical diaphragm 0206, and a drive chamber 0205.

[0018] The hemispherical diaphragm 0206 is sandwiched between the drug chamber 0207 and the driving liquid chamber 0205.

[0019] The hemispherical diaphragm 0206 separates the drug in the drug chamber 0207 from the driving fluid in the driving fluid chamber 0205. It also transmits the driving force generated by the driving fluid chamber 0205 to the drug chamber 0207. The drug chamber 0207 stores the drug to be injected. The driving fluid chamber 0205 stores the driving fluid, providing pressure for the needle-free injector.

[0020] In this embodiment, a hemispherical diaphragm separates the drug in the drug chamber from the driving fluid in the driving fluid chamber, preventing the risk of drug and driving fluid mixing and contamination. Simultaneously, when the driving fluid ionizes to generate driving force, the hemispherical diaphragm experiences more uniform stress than a regular diaphragm, reducing the risk of cracking due to repeated stress deformation and increasing the diaphragm's service life.

[0021] In an alternative embodiment, the drive chamber includes a drive chamber recess. The drive chamber recess is coupled and matched with a hemispherical diaphragm.

[0022] A hemispherical diaphragm is located in the groove of the driving liquid chamber.

[0023] In this embodiment, the hemispherical diaphragm is fixed by a drive chamber groove that is coupled and matched with the hemispherical diaphragm, thereby fixing it by means of interlocking components, reducing fixing screws, reducing the cost of consumables, and reducing the treatment cost for patients.

[0024] In an optional embodiment, the hemispherical diaphragm edge is provided with sealing ribs. These sealing ribs prevent leakage of the driving fluid and medication, thereby increasing the sealing performance of the needle-free injector.

[0025] In one optional embodiment, the hemispherical diaphragm is made of a soft rubber material. This soft rubber material includes rubber-based materials or silicone rubber-based materials.

[0026] In an optional embodiment, the needle-free injector further includes a housing. The housing includes a guide groove. The drive fluid chamber includes a first side boss corresponding to the guide groove. The drug fluid chamber includes a second side boss corresponding to the guide groove.

[0027] The driving fluid chamber is located inside the housing via a guide groove through a first side boss. The medicine chamber is located inside the housing via a guide groove through a second side boss. The medicine chamber, the hemispherical diaphragm, and the driving fluid chamber are stacked sequentially inside the housing.

[0028] In this embodiment, the drug chamber and the drive fluid chamber are fixed to the inside of the housing by interlocking the components, reducing the number of fixing screws, lowering the cost of consumables, and reducing the treatment cost for patients.

[0029] In an optional embodiment, the needle-free injector further includes a housing. The housing includes a multi-start internal thread. The drive fluid chamber includes a first multi-start external thread corresponding to the multi-start internal thread. The drug fluid chamber includes a second multi-start external thread corresponding to the multi-start internal thread.

[0030] The liquid chamber, hemispherical diaphragm, and driving liquid chamber are sequentially stacked inside the outer casing. The driving liquid chamber and the outer casing are threadedly connected by a multi-start internal thread and a first multi-start external thread. The liquid chamber and the outer casing are threadedly connected by a multi-start internal thread and a second multi-start external thread.

[0031] In this embodiment, the drug chamber and the drive fluid chamber are fixed to the inside of the outer shell by means of threaded connection, which reduces the number of fixing screws, reduces the cost of consumables, and reduces the treatment cost for patients.

[0032] The following describes a specific needle-free injector structure and provides a detailed explanation of the needle-free injector in this embodiment.

[0033] Figure 5This is an exploded view of the needle-free injector used in this example. As shown in the figure, the needle-free injector of this example includes: an arc-shaped PCB board 0201, a threaded interface 0202, a window lens 0203, a sealing ring 0204, a drive liquid chamber 0205, a hemispherical diaphragm 0206, a liquid chamber 0207, a first duckbill valve 0208, a nozzle 0209, a housing 0210, a protective cover 0211, a second duckbill valve 0212, a liquid inlet interface 0213, a fastening screw 0214, and a plug 0215.

[0034] The curved PCB base plate 0201 has a memory chip on it. The memory chip stores information about the needleless injector, such as model number, anti-counterfeiting identification, and usage status. The curved PCB base plate 0201 has a pin contact contact 020101, which faces the pin direction of the handpiece and, after assembly, couples with the spring pin of the curved pin plate of the handpiece. For example... Figure 6 and Figure 7 As shown, an EEPROM chip (Electrically Erasable Programmable Read-Only Memory chip) 020102 is located on the lower surface 020103 of the curved PCB base plate. The EEPROM chip is fixedly connected to the threaded connector 0202 by dispensing. The EEPROM chip can store the manufacturing date of the needleless injector, determine whether it has been used, and the first time it was connected to the host, etc.

[0035] The outer casing 0210 is a cylindrical plastic part, which can be made of ABS, PC, or other plastic materials. The outer casing 0210 has a third limiting step surface 021005, a second limiting step surface 021006, and a first limiting step surface 021007. The third limiting step surface 021005 limits the threaded connector 0202, the second limiting step surface 021006 limits the drive fluid chamber 0205, and the first limiting step surface 021007 limits the nozzle 0209. Specifically, the lower surface of the nozzle flange of the nozzle 0209 contacts and limits the first limiting step surface 021007, the upper surface of the threaded connector 0202 contacts and limits the third limiting step surface 021005, and the upper surface of the drive fluid chamber 0205 contacts and limits the second limiting step surface 021006. The first limiting step surface 021007 and the second limiting step surface 021006 stack the component nozzle 0209, the first duckbill valve 0208, the liquid chamber 0207, the hemispherical diaphragm 0206, and the driving liquid chamber 0205 in sequence and press them against each other. By compressing the elastic space of the elastic components first duckbill valve 0208 and hemispherical diaphragm 0206, the components between the limiting step surfaces are pressed, fixed and sealed.

[0036] Additionally, there are three ribs 021002 on the upper part of the outer casing 0210, such as... Figure 8As shown, they are evenly distributed within three-quarters of the circumference. Due to the thin-walled nature of the outer shell 0210, it possesses a certain degree of elasticity. During assembly, as the threaded joint 0202 is screwed on, the third side boss 020203 presses against the upper part of the inner wall of the rib 021002, causing the rib 021002 to deform outward until the third side boss 020203 rotates into the gap between the first end face 021003 and the second end face 021004 and gets stuck, thus achieving the function of preventing rotation and fixing.

[0037] like Figure 9 As shown, threaded connector 0202 has its thread 020201 fastened to the hand tool port. Thread 020201 is a multi-start thread; in this example, it is a 4-start thread. It should be noted that 2-start, 3-start, 5-start, and 6-start threads can also be used; there are no restrictions on this.

[0038] The fourth side boss 020202 is evenly distributed on the threaded joint 0202. The threaded joint 0202 is placed downwards to the bottom and a certain downward pressure is applied. After reaching the bottom, the threaded joint 0202 is rotated so that the upper surface of the fourth side boss 020202 contacts the third limiting step surface 021005, thereby offsetting part of the upward elastic force of the elastic element sealing ring 0204, the first duckbill valve 0208, and the hemispherical diaphragm 0206. This causes the two opposing limiting surfaces, the third limiting step surface 021005 and the first limiting step surface 021007, to exert a pre-tightening force that compresses each other. This pre-tightening force and the elastic force of the elastic element sealing ring 0204, the first duckbill valve 0208, and the hemispherical diaphragm 0206 reach a balanced state.

[0039] The threaded connector 0202 also has a notch insertion slot 020205 on its upper part. The insertion slot facilitates the insertion and tightening of tools during assembly. It should be noted that this is not the only tightening method; the tightening effect can also be achieved by adding anti-slip knurling to the outermost circle of the threaded connector 0202.

[0040] The threaded connector 0202 also has a semi-circular notch 020206 on the upper part, which can be used as a positioning groove when assembling the needleless injector with the handpiece. During assembly, the semi-circular notch 020206 and the semi-circular boss of the handpiece complement each other and are screwed until the multi-start thread of the handpiece is coupled with the fourth side boss 020202.

[0041] The arc-shaped groove 020207 is the mounting groove for the arc-shaped PCB base plate 0201, and is fixed and installed by dispensing.

[0042] The window lens 0203 and the sealing ring 0204 are placed between the threaded joint 0202 and the driving liquid chamber 0205 in sequence. The window lens 0203 is positioned in the lens groove 020204, and the sealing ring 0204 is placed in the sealing groove 020502 on the upper surface of the driving liquid chamber 0205. This causes the two opposing limiting surfaces, the third limiting step surface 021005 and the first limiting step surface 021007, to be pressed against each other by a pre-tightening force. This pre-tightening force is balanced with the elastic force of the elastic element sealing ring 0204, the first duckbill valve 0208, and the hemispherical diaphragm 0206.

[0043] like Figure 10 As shown, the driving liquid chamber 0205 also has a cavity 020501 in the middle, which is filled with driving liquid, serving as the power source. The driving liquid is ionized by a high-energy-density focused laser, forming plasma bubbles. This increases the pressure in the driving liquid chamber, causing the hemispherical diaphragm 0206 to undergo elastic deformation downwards under the increased pressure. To improve the driving effect of the driving liquid, it can be a sodium chloride solution of a certain concentration to promote the generation of plasma bubbles, and the driving liquid undergoes degassing treatment to remove air components from the liquid.

[0044] The lower surface of the driving liquid chamber 0205 has a driving liquid chamber groove 020503. The outline shape of the driving liquid chamber groove 020503 is coupled and matched with the hemispherical diaphragm 0206 to achieve sealing.

[0045] The drive fluid chamber 0205 has evenly distributed first side bosses 020504 on its side. In this example, there are four. It should be noted that the number of first side bosses 020504 is not limited; it can be two, three, five, six, etc. During assembly, the first side bosses 020504 are respectively placed into the vertical guide slots in the 0210 housing (e.g., ...). Figure 8 The first vertical guide groove 021008, the second vertical guide groove 021009, the third vertical guide groove 021010, and the fourth vertical guide groove 021011 shown are placed downwards to the bottom and rotated until the upper surface 020507 of the driving liquid chamber is in complete contact with the second limiting surface 021006, which plays a role in locking and fixing.

[0046] The drive fluid chamber 0205 has evenly distributed first side bosses 020504 on its side, each with a notch 020505 and an inclined surface 020506. Their functions are respectively to serve as insertion slots for installing tools during rotation and as guide inclined surfaces during rotation.

[0047] The hemispherical diaphragm 0206 is made of soft rubber, which can be either rubber-based or silicone rubber-based. For example... Figure 11As shown, the central structure of the hemispherical diaphragm can be a hemispherical membrane 020602, with sealing ribs 020601 around its edge. The sealing ribs 020601 serve a sealing function, preventing leakage of the drug solution and driving fluid under high pressure. The hemispherical membrane 020602 isolates the drug solution and driving fluid, and also transmits power, transferring the pressure generated when bubbles form in the driving fluid to the hemispherical membrane 020602. The hemispherical diaphragm 0206 undergoes uniform elastic deformation towards the drug chamber side, squeezing the liquid in the chamber 020701, thereby expelling the drug solution from the outlet 020703 of the drug chamber 0207.

[0048] like Figure 12 As shown, the medicine chamber 0207 contains a cavity 020701 filled with therapeutic drugs. The cavity is compressed by the hemispherical diaphragm 0206, which generates pressure, thereby squeezing the medicine out of the cavity 020701 from the outlet 020703.

[0049] The medicine chamber 0207 has an inlet 020702. A second duckbill valve 0212 is installed inside the inlet. The function of this inlet is to realize the one-way flow of the medicine, that is, to allow the medicine to flow into the chamber 020701 only from the inlet 020702.

[0050] The structure of the second side boss 02074 of the liquid chamber 0207 is as follows: Figure 12 It consists of the first second side boss 020704, the second second side boss 020708, the third second side boss 020707, and the fourth second side boss 020706 shown.

[0051] The first duckbill valve 0208 and the second duckbill valve 0212 are miniature one-way valves made of soft rubber, which can be either rubber or silicone rubber. Their function is to achieve unidirectional liquid flow. In this example, the one-way valves are two duckbill valves of the same specification. Figure 13 As shown, the two duckbill valves have flange edge 020801 and a straight nozzle 020802. This straight nozzle 020802 can only flow in one direction. When the flow is reversed, the first side 020803 and the second side 020804 will be squeezed by pressure and tightly closed, thereby achieving unidirectional performance.

[0052] The second duckbill valve 0212 is located within the space of inlet 020702. See [link / reference] Figure 12 Looking down from the upper surface 020709 of the liquid chamber, the flange edge 020801 of the second duckbill valve 0212 is sandwiched between the flange groove 020710 of the liquid chamber 0207 and the surface 021302 of the liquid inlet, and is fixed with screws through the screw holes. The contour shape of the flange edge 020801 of the second duckbill valve 0212 is consistent with the mating surface of the flange groove 020710 to ensure its sealing performance.

[0053] There is a first duckbill valve 0208 on the outside of the outlet of the medicine chamber 0207. The function of this outlet 020703 is to realize the unidirectional flow of the medicine, that is, only the medicine flows out of the chamber 020701 from the outlet 020703 and enters the nozzle 0209.

[0054] The first duckbill valve 0208 is placed in the inner cavity 020902 of the nozzle 0209, and its flange edge 020801 is sandwiched between the outlet of the liquid chamber 0207 and the flange groove 020901 of the nozzle 0209, so as to achieve sealing performance and one-way performance.

[0055] like Figure 14 As shown, nozzle 0209 has a capillary outlet 020904, which ejects a thin and rapid stream of liquid that directly enters human tissue. Flanges 020903 are located on both sides of nozzle 0209. Nozzle 0209 is made of ceramic materials, such as zirconia ceramic or alumina ceramic, or it can be made of materials with high rigidity and hardness, such as metal.

[0056] The outer circular surface 020905 of the nozzle 0209 is in contact with the inner circular surface 021008 of the housing 0210; the lower surface of the flange 021003 is in contact with the first limiting step surface 021007. The outer circular surface of the flange 021003 is in contact with the inner circular surface 021009 of the housing 0210. The first limiting step surface 021007 provides support, generating an upward supporting force, which is transmitted according to the order of the stacked components until a force balance is reached with the third limiting step surface 021005 and the second limiting step surface 021006.

[0057] The protective cover 0211 is made of a transparent material. Its function is to protect the patient from splashing medication during the spray, preventing unnecessary danger. The transparency also allows for easy observation of the treatment location. Additionally, it provides vertical positioning, ensuring the distance between the injection site on the skin surface and the tip of the nozzle 0209 remains within an appropriate range. This prevents insufficient spray force due to excessive distance, affecting the injection volume, or excessively deep or uneven injection depth due to insufficient distance. The protective cover 0211 is secured using a snap-fit ​​method, relying on interference fit and the material's elastic deformation to achieve a tight clamping fixation.

[0058] like Figure 15 As shown, the drug inlet interface 0213 is used to connect the drug delivery device to the needleless injector. The inlet conical surface 021307 has a slope of approximately 6:100. This conical surface slope design ensures the tightness and stability of the connection with other medical devices such as infusion tubing connectors, preventing liquid leakage. It also facilitates quick and accurate connection and disconnection during operation.

[0059] The liquid medicine inlet 0213 has a threaded structure 021305, which is used to lock the connected medicine inlet interface to prevent it from falling off. The liquid medicine inlet 0213 also has an interface thread 021306. The liquid medicine enters the second duckbill valve 0212 through the injection port 021301, opening the slotted nozzle 020802 of the second duckbill valve 0212, and the liquid medicine flows into the chamber 020701 from the inlet 020702.

[0060] The liquid inlet 0213 is locked in place by screws 0214. Under the clamping force of the screws, the flange edge 020801 of the second duckbill valve 0212 is clamped between the flange groove 020710 of the liquid chamber 0207 and the surface 021302 of the liquid inlet 0213 to achieve a seal.

[0061] The outer surface of the liquid input interface 0213 has an elongated oval surface 021309, which is coupled and matched with the elongated oval surface 021001 of the outer shell 0210, and has an arc surface 021308 that is coupled and matched with the outer circular surface of the outer shell 0210.

[0062] The liquid medicine inlet 0213 has a cylindrical countersunk through hole 021303. The screw 0214 passes through this cylindrical countersunk through hole 021303 from the outside to the inside and is screwed into the threaded hole 020705 of the liquid medicine chamber 0207. This tightens the liquid medicine inlet 0213 and the liquid medicine chamber 0207, compressing the flange edge 020801 of the second duckbill valve 0212 to achieve the functions of fixing and sealing.

[0063] Plug 0215 is an unsightly plug made of soft rubber, which can be either rubber or silicone rubber. It is placed in the countersunk head 021305 of the countersunk hole 021303 to cover the screw. The outer diameter of plug 0215 is slightly larger than the inner diameter of countersunk head 021305. After insertion, the soft rubber material of plug 0215 adheres tightly to the inner wall of countersunk head 021305 by its own elastic tension, preventing it from falling off.

[0064] The internal structure of the needleless injector housing in this example is as follows: Figure 16 As shown, this example of a needle-free injector features a simple structure, low failure rate, and high production efficiency. The simple structure of this needle-free injector also reduces the number of fixing screws, using interlocking components for fixation. This reduces the cost of using the needle-free injector as a consumable, thus reducing treatment costs for patients. Furthermore, the sealed and non-removable needle-free injector structure prevents contamination of the driving fluid and medication inside the injector head due to misuse, avoiding the risk of incorrect use.

[0065] Additionally, the assembly method for the needle-free injector in this example is as follows: Step 1: Place the nozzle, first duckbill valve, medicine chamber, hemispherical diaphragm, and drive liquid chamber into the outer casing in sequence. During placement, the first side protrusion of the drive liquid chamber should align with the vertical guide groove of the outer casing. The second side protrusion of the medicine chamber should also align with the vertical guide groove of the outer casing.

[0066] The second step is to press down and rotate the driving liquid chamber so that its upper surface is in complete contact with the second limiting step surface, which serves to hold and fix it in place.

[0067] The third step is to place the sealing ring in the sealing groove on the upper surface of the drive fluid chamber.

[0068] Step 4: Fill the drive fluid chamber with degassed drive fluid.

[0069] Step 5: Place the window lens concentrically on the sealing ring.

[0070] Step 6: Place the fourth side boss of the threaded connector into the vertical guide groove of the outer shell, and the window lens will also enter the lens groove of the threaded connector.

[0071] Step 7: Press down and rotate the threaded joint until the third side boss abuts against the upper inner wall of the rib, causing the rib of the outer shell to deform outward until the third side boss rotates into the gap between the first and second end faces and gets stuck, thus achieving the function of preventing rotation and fixing. At this time, the upper surface of the third side boss is in complete contact with the limiting surface, playing a role in supporting and fixing.

[0072] Step 8: Place the second duckbill valve into the inlet space of the medicine chamber in sequence, and place the medicine input interface into the elongated hole of the outer shell so that the arc surface fits into the outer circular surface. Align the injection port with the center of the second duckbill valve and the inlet of the medicine chamber.

[0073] Step 9: Pass the fastening screw from the outside to the inside through the cylindrical countersunk hole, and screw it into the threaded hole of the liquid chamber to lock it in place.

[0074] Step 10: Place the countersunk head into the countersunk hole.

[0075] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A needle-free injector, characterized in that, The needleless injector includes: a drug chamber, a hemispherical diaphragm, and a driving fluid chamber; The hemispherical diaphragm is sandwiched between the drug chamber and the driving liquid chamber; The hemispherical diaphragm is used to separate the drug in the drug chamber from the driving fluid in the driving fluid chamber; it is also used to transmit the driving force generated by the driving fluid chamber to the drug chamber; the drug chamber is used to store the drug to be injected; the driving fluid chamber is used to store the driving fluid and provide pressure for the needle-free injector.

2. The needle-free injector as described in claim 1, characterized in that, The driving liquid chamber includes a driving liquid chamber groove; the driving liquid chamber groove is coupled and matched with the hemispherical diaphragm. The hemispherical diaphragm is disposed within the groove of the driving liquid chamber.

3. The needle-free injector as described in claim 1, characterized in that, The edge of the hemispherical diaphragm is provided with sealing ribs; the sealing ribs are used to prevent leakage of the driving fluid and the drug.

4. The needle-free injector as described in claim 1, characterized in that, The hemispherical diaphragm is made of soft rubber material; wherein, the soft rubber material includes rubber-based materials or silicone rubber-based materials.

5. The needle-free injector as described in claim 1, characterized in that, The needle-free injector further includes a housing; the housing includes a guide groove; the driving liquid chamber includes a first side boss corresponding to the guide groove; the drug liquid chamber includes a second side boss corresponding to the guide groove; The driving liquid chamber is disposed inside the outer shell along the guide groove via the first side boss; the medicine chamber is disposed inside the outer shell along the guide groove via the second side boss; the medicine chamber, the hemispherical diaphragm, and the driving liquid chamber are sequentially stacked inside the outer shell.

6. The needle-free injector as described in claim 1, characterized in that, The needle-free injector also includes a housing; the housing includes a multi-start internal thread; the drive fluid chamber includes a first multi-start external thread corresponding to the multi-start internal thread; the drug fluid chamber includes a second multi-start external thread corresponding to the multi-start internal thread; The liquid chamber, the hemispherical diaphragm, and the driving liquid chamber are sequentially stacked inside the outer shell; the driving liquid chamber and the outer shell are threadedly connected by the multi-start internal thread and the first multi-start external thread; the liquid chamber and the outer shell are threadedly connected by the multi-start internal thread and the second multi-start external thread.

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