An injection device and method of using the same

Abstract

The application relates to an injection device and a use method thereof, belonging to the field of medical instruments, which comprises an ampoule injection medicine tube and a needleless syringe, the ampoule injection medicine tube is installed at the front end of the needleless syringe; through closed loop force control of a voice coil motor, a driver and a pressure sensor at the two ends of the voice coil motor module, the pressure is detected in real time and fed back to the driver, the driver adjusts the output current in real time according to the feedback pressure, the output thrust is accurately controlled to meet the constant thrust in the needleless injection process, the injection depth reaches the expected injection site, the gap between the voice coil motor rod and the piston push rod is solved, the rod can generate an impact force on the piston push rod when the injection is excited, the piston push rod is extremely likely to be deformed and bent, and the injection fails; the voice coil motor cannot realize closed loop force control, and the thrust size in the injection process cannot be accurately controlled.

Description

Technical Field

[0001] This invention relates to an injection device and its method of use, belonging to the field of medical devices. Background Technology

[0002] A needle-free injector is a device that injects medication under pressure without a needle. It typically uses springs, high-pressure gas, or electromagnetic energy to pressurize the liquid inside the ampoule, causing the high-pressure liquid to be ejected at high speed through a tiny hole, much like a water needle penetrating the skin and entering the subcutaneous tissue to complete the injection.

[0003] Needle-free injectors can be used for the injection of drugs such as insulin, vaccines, growth hormone, compound betamethasone, and lidocaine hydrochloride.

[0004] It is known that the thrust of needle-free injection uses springs, high-pressure gas, electromagnetic energy, etc. These forces are at their maximum value at the beginning, but as the thrust is released, the thrust continuously decreases and cannot be kept constant, resulting in large variations in injection depth and failing to provide patients with a good effect.

[0005] Furthermore, the patent with publication number CN 113509617 has defects. The aspiration and bubble removal part is composed of components such as an empty cup motor, gear set, and angle sensor, which is extremely complex. There is a gap between the voice coil motor impact rod and the piston push rod, which causes the impact rod to generate an impact force on the piston push rod during stimulation injection, which is very likely to cause the piston push rod to deform and bend, resulting in injection failure. The voice coil motor does not achieve closed-loop force control, and cannot accurately control the magnitude of the thrust during injection. Summary of the Invention

[0006] Based on the problems described in the background, the present invention aims to solve the following problem: providing an injection device and its usage method, which uses a closed-loop force-controlled voice coil motor, a driver, and pressure sensors at both ends of the voice coil motor module to detect pressure in real time and feed it back to the driver. The driver adjusts the output current in real time according to the feedback pressure, accurately controlling the output thrust to ensure that the thrust remains constant during needle-free injection, thereby ensuring that the injection depth reaches the expected injection site, thus solving the aforementioned problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: providing an injection device, including an ampoule injection tube and a needle-free injector, wherein the ampoule injection tube is installed at the front end of the needle-free injector;

[0008] The ampoule injection tube includes an injection head, a sealing ring 1, a return spring 1, a sealing rod 1, an ampoule shell, a return spring 2, a sealing rod 2, a sealing ring 2, a Luer adapter, a piston, and a core rod. The ampoule shell has an inclined connector portion with threads on the front end and the rear end. The injection head is threaded onto the front end of the ampoule shell and sealed by the sealing ring 1. The injection head has a return spring 1 inside, and a sealing rod 1 is located at the other end of the return spring 1. The inclined connector portion of the ampoule shell has a return spring 2 inside, which is connected to the sealing rod 2. The Luer adapter is threaded onto the inclined connector portion of the ampoule shell. The sealing ring 2 seals the internal connection between the Luer adapter and the inclined connector portion of the ampoule shell. The ampoule shell has a piston inside, which is connected to the core rod.

[0009] Preferably, the needle-free injector includes a manual injector and an automatic injector.

[0010] The manual syringe includes a cap, lower shell, hammer, excitation spring, washer, rubber ring, external push mechanism, internal push mechanism, hammer fixing component, inner shell, aluminum ring, fixing component, ball bearing 1, ball bearing 2, guide rail 1, guide rail 2, thrust ball bearing, steel ball guide groove component, locking steel ball, inner button 1, reset spring 3, stop block, reset spring 4, inner button 2, button, and upper shell;

[0011] Preferably, the lower shell front end is snap-fitted with a protective cap, the lower shell front end is provided with an internal thread, a hammer is installed inside the lower shell, a washer is provided at the front end of the hammer, and the tail end of the hammer is provided with an internal thread. The excitation spring is installed on the hammer and contacts the washer. The lower shell tail end is provided with threads on both the inner and outer sides. The inner shell is connected to the inner shell through the internal thread of the lower shell tail end. The inner shell is sleeved on the outside of the excitation spring. An aluminum ring is threaded to the outer thread of the lower shell tail end and contacts the lower shell through a rubber ring. The hammer fixing component is connected to the hammer through a thread to form an integral part. The tail end of the inner shell is integrally formed with a steel ball guide groove component through injection molding. The steel ball guide groove component is located outside the hammer fixing component. A locking steel ball is installed on the steel ball guide groove component. The fixing component is installed outside the tail end of the aluminum ring. A ball bearing is installed on the fixing component and mates with the inner groove of the inner shell tail end. A thrust ball bearing is installed inside the inner shell and located... The upper shell is fitted over the aluminum ring and connected to the front end by a fastener. The stop block is located inside the upper shell and at the connection between the ball guide groove and the inner shell. A return spring is installed on one side of the stop block and is vertically connected to the lower inner wall of the upper shell. Guide rail one and guide rail two are integrally molded with the upper shell and are located on the upper inner wall of the upper shell. The outer push mechanism is installed on the inner push mechanism, which is installed on the surface of the upper shell. Ball ball two is installed on the inner push mechanism and cooperates with guide rail one and guide rail two. The lower end of the inner push mechanism cooperates with the inclined surface of the stop block. Inner button one is located at the inner end of the ball guide groove. A return spring three is installed at the other end of inner button one. Inner button two is fitted over the outer end of the ball guide groove and connected to the button by a thread. Button two is connected to the button as a whole by a thread. The button is located at the end of the upper shell and passes through it. The other end of the return spring three is connected to the inside of the button.

[0012] Preferably, the auto-injector includes an upper shell, an ampoule fixing bayonet, a voice coil motor module, a voice coil motor driver and a touch screen, a safety lock, a ball bearing, a trigger, a return spring, a micro switch, a small stop, a decorative cover, and a lower shell.

[0013] The upper and lower shells constitute the outer shell of the auto-injector. Inside the outer shell, a voice coil motor module is installed in the upper part. An ampoule fixing bayonet voice coil motor driver and a touch screen are installed at the front end of the upper and lower shells, which constitute the outer shell of the auto-injector. The trigger is installed at the middle trigger port of the upper and lower shells, which constitute the outer shell of the auto-injector. The safety lock is installed above the trigger and located at the mating point in the lower shell. A ball bearing three is installed on the safety lock and engages with the trigger below. A return spring five is installed inside the trigger and engages with the lower shell. A micro switch is installed inside the lower shell and located below the trigger and works with the trigger. A small stop is installed to the right of the micro switch. A decorative cover is installed at the bottom of the upper and lower shells, which constitute the outer shell of the auto-injector.

[0014] Preferably, the voice coil motor module includes a rigid magnetic flux circuit, a permanent magnet, a return spring, a coil, a moving part, a slide, a small hammer, and a small guide rail;

[0015] The rigid magnetic flux circuit has a cylinder in the middle and a small guide rail at the bottom. The permanent magnet is fixed inside the rigid magnetic flux circuit. The coil is sleeved on the outside of the moving part. The return spring is sleeved on the cylinder inside the rigid magnetic flux circuit. The moving part is sleeved on the cylinder inside the rigid magnetic flux circuit and is located to the right of the return spring. The right end of the moving part has a thread. The left end of the small hammer is fixed to the moving part by the thread. The moving part is fixed to the slide table. The small hammer passes through the notch on the right side of the slide table. The slide table has a groove. The rigid magnetic flux circuit is slidably connected to the slide table through the small guide rail at the bottom and the groove. A position sensor and a pressure sensor are installed on the slide table.

[0016] Preferably, a convex lens is installed on the upper outer wall of the lower shell.

[0017] Preferably, two sets of decorative elements are installed on the outer wall of the upper shell.

[0018] The present invention also provides a method of using an injection device, including a method of using an ampoule injection tube, a method of using a manual syringe, and a method of using an automatic syringe;

[0019] The method of using the ampoule injection tube includes the following steps:

[0020] (1.1) The liquid medicine bottle is connected to the ampoule shell via a Luer adapter;

[0021] (1.2) The piston and the core rod are connected together, and the two move together;

[0022] (1.3) The core rod is pulled from the left side of the ampoule shell cavity to the right, and a negative pressure is generated in the cavity. When the negative pressure exceeds the pressure of the second return spring, the second sealing rod is released, and the liquid in the medicine bottle enters the inner cavity of the ampoule shell through the connecting tube.

[0023] (1.4) The core rod is pushed to the left. The sealing rod two seals the connecting tube under the pressure of the liquid and the return spring two to prevent the liquid from returning to the liquid bottle. When the liquid pressure is greater than the pressure of the return spring one, the sealing rod one moves to the left. The inner cavity of the injection head is connected to the inner cavity of the ampoule shell. The inner cavity of the injection head is filled with liquid. The internal air is discharged through the spray hole under the action of the liquid. The core rod moves back and forth left and right to draw up the required amount of liquid.

[0024] (1.5) The injector applies sufficient excitation force to the core rod, and the liquid medicine in the inner cavity of the ampoule shell is sprayed out through the injection head nozzle to complete the liquid medicine injection.

[0025] Preferably, the method of using the manual syringe includes the following steps:

[0026] (2.1) The excitation spring is not pressurized, and the manual syringe is in a relaxed state;

[0027] (2.2) Hold the upper and lower shells of the manual syringe with both hands respectively, rotate the upper and lower shells manually to compress the excitation spring, move the hammer fixing part to the right, push the inner button one to the right, when the groove of the hammer fixing part is radially aligned with the position of the locking steel ball, the button moves to the right under the action of the reset spring three, pushes the locking steel ball into the groove of the hammer fixing part, and the hammer is locked by the locking steel ball to complete the pressurization action;

[0028] (2.3) Assemble the ampoule injection tube and the manual syringe together, and fasten the core rod and the hammer together. The hammer drives the core rod to move together.

[0029] (2.4) Manually rotate the manual syringe, the lower shell moves to the left, the hammer drives the core rod to draw up the medicine, place the ampoule injection tube vertically upward, rotate the manual syringe in the opposite direction to expel the air in the injection head, adjust the rotation of the manual syringe to complete the aspiration of the specified amount of medicine; if a new ampoule injection tube is not replaced, the air venting operation is not required for subsequent aspiration and injection.

[0030] (2.5) Push the pusher to the right to unlock the safety lock, press the button to complete the injection, and the injector will return to its original state.

[0031] Preferably, the method of using the auto-injector includes the following steps:

[0032] (3.1) Set the injection dose and corresponding injection force;

[0033] (3.2) Tighten the ampoule injection tube and the ampoule fixing clip of the auto-injector;

[0034] (3.3) Assemble the medicine bottle and Luer adapter together;

[0035] (3.4) Press the trigger to complete the electromagnetic energy storage and full dose of drug; through program control, the air in the injection head cavity of the ampoule injection tube will be automatically vented when the ampoule injection tube is installed and used for the first time. If a new ampoule injection tube is not replaced, the air venting operation will not be performed for subsequent drug injection.

[0036] (3.5) Press the trigger to complete the injection of the drug solution; press the trigger continuously to complete the injection of all the drugs solution.

[0037] (3.6) Repeat steps (3.4) and (3.5) to complete continuous inhalation and injection.

[0038] The beneficial effects of this invention are:

[0039] 1. This invention adopts an automatic pressurization, drug aspiration, and injection method, and uses a closed-loop force-controlled voice coil motor for linear drive. It can obtain continuous power supply through a 220V power supply or battery. It is suitable for medical aesthetics industry where injection frequency is relatively high and continuous injection is required, as well as for batch injection scenarios of animal vaccines, and has high practicality.

[0040] 2. The manual syringe has a compact structure, is easy to carry, and is suitable for use in scenarios with low injection frequency.

[0041] 3. The plunger and hammer of the automatic injector are always fixed together. Under the action of the closed-loop force-controlled voice coil motor, the injection is completed with a near-constant force, which can significantly improve the accuracy of the injection.

[0042] 4. The voice coil motor operates smoothly and produces very little noise when switching motion directions and starting injection, which can significantly reduce patient discomfort and eliminate the sudden popping sound that traditional needle-free injectors make. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the manual syringe and ampoule injection tube of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the automatic injector and ampoule injection tube of the present invention;

[0045] Figure 3 A schematic diagram and exploded view of the ampoule injection tube;

[0046] Figure 4 A schematic diagram and exploded view of a manual syringe;

[0047] Figure 5 Side view of a manual syringe;

[0048] Figure 6 An exploded view of an autoinjector;

[0049] Figure 7 This is a schematic diagram of an auto-injector.

[0050] Figure 8 A schematic diagram and exploded view of the voice coil motor module;

[0051] In the diagram: 1 is the ampoule injection tube; 2 is the manual syringe; 3 is the automatic syringe; 11 is the injection head; 12 is the first sealing ring; 13 is the first return spring; 14 is the first sealing rod; 15 is the ampoule shell; 16 is the second return spring; 17 is the second sealing rod; 18 is the second sealing ring; 19 is the Luer adapter; 110 is the piston; 111 is the core rod; 21 is the protective cap; 22 is the lower shell; 23 is the convex lens; 24 is the hammer; 25 is the excitation spring; 26 is the washer ring; 27 is the rubber ring; 28 is the external push mechanism; 29 is the internal push mechanism; 210 is the hammer fixing component; 211 is the inner shell; 212 is the aluminum ring; 213 is the fixing component; 214 is the first ball bearing; 215 is the second ball bearing; 216 is the first guide rail; 217 is the second guide rail; 218 is the thrust ball bearing; 21 9 is the ball bearing guide; 220 is the decorative part; 221 is the locking ball; 222 is the inner button one; 223 is the return spring three; 224 is the stop block; 225 is the return spring four; 226 is the inner button two; 227 is the button; 228 is the upper shell; 31 is the upper shell; 32 is the ampoule fixing slot; 33 is the voice coil motor module; 34 is the voice coil motor driver and touch screen; 35 is the safety lock; 36 is the ball bearing three; 37 is the trigger; 38 is the return spring five; 39 is the micro switch; 310 is the small stop block; 311 is the decorative cover; 312 is the lower shell; 331 is the rigid magnetic flux circuit; 332 is the permanent magnet; 333 is the return spring six; 334 is the coil; 335 is the moving part; 336 is the slide table; 337 is the small hammer; 338 is the small guide rail. Detailed Implementation

[0052] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0053] Example 1: As Figure 1 and Figure 2 As shown, the present invention provides an injection device, including an ampoule injection tube 1 and a needle-free injector, wherein the ampoule injection tube 1 is installed at the front end of the needle-free injector.

[0054] like Figure 3As shown, the ampoule injection tube 1 includes an injection head 11, a sealing ring 12, a return spring 13, a sealing rod 14, an ampoule shell 15, a return spring 16, a sealing rod 17, a sealing ring 18, a Luer adapter 19, a piston 110, and a core rod 111. The ampoule shell 15 has an inclined connector portion and threads on the front end inside and the rear end outside. The injection head 11 is threadedly installed at the front end of the ampoule shell 15, and the threaded portion is sealed by the sealing ring 12. The injection head 11 is internally... A return spring 13 is provided, and a sealing rod 14 is provided at the other end of the return spring 13. A return spring 2 16 is provided inside the inclined joint portion of the ampoule housing 15. The return spring 2 16 is connected to the sealing rod 2 17. The Luer adapter 19 is fixed to the inclined joint portion of the ampoule housing 15 by threads. The sealing ring 2 18 seals the internal connection between the Luer adapter 19 and the inclined joint portion of the ampoule housing 15. A piston 110 is provided inside the ampoule housing 15. The piston 110 is connected to the core rod 111.

[0055] The function of the ampoule injection tube 1 is to hold the liquid medication and provide a small orifice for dispensing the medication. The ampoule structure of the ampoule injection tube 1 allows for multiple injections from a single dose and continuous dispensing after the initial injection. The ampoule injection tube 1 can be manufactured using different molding and processing methods to suit different applications. For example, when used for human injection, the main body of the ampoule injection tube 1 can be injection molded from a polymer material (such as PC material), and sterilized after assembly to meet the requirements for human use. As a medical consumable, the ampoule injection tube 1 is for single use to meet the safety and effectiveness requirements of medical devices. When used for animal group injection, the main body of the ampoule injection tube 1 can also be machined from metal to meet the needs of continuous medication and reduce usage costs.

[0056] In this application, after assembling the ampoule injection tube 1, the liquid bottle is installed onto the inclined connector portion of the ampoule housing 15 via the Luer adapter 19. Then, during use, the core rod 111 is pulled from the left side to the right of the cavity of the ampoule housing 15 using a syringe. Under the action of the piston 110, a negative pressure is generated in the cavity. When the negative pressure exceeds the pressure of the second return spring 16, the second sealing rod 17 is released, and the liquid in the liquid bottle enters the inner cavity of the ampoule housing 15 through the connecting tube.

[0057] Then, the syringe plunger 111 is pushed to the left. The sealing rod 17 seals the connecting tube under the pressure of the liquid and the return spring 16, preventing the liquid from returning to the liquid bottle. When the liquid pressure exceeds the pressure of the return spring 13, the sealing rod 14 moves to the left, and the inner cavity of the injection head 11 connects with the inner cavity of the ampoule shell 15. The inner cavity of the injection head 11 is filled with liquid, and the internal air is discharged through the nozzle under the action of the liquid. The plunger 111 moves back and forth left and right to draw up the required amount of liquid.

[0058] Finally, sufficient excitation force is applied to the core rod 111 through the injector, and the liquid medicine in the inner cavity of the ampoule shell 15 is ejected through the nozzle of the injection head 11, completing the liquid medicine injection.

[0059] The needleless injector includes a manual injector 2 and an automatic injector 3.

[0060] like Figure 4 and Figure 5 As shown, the manual syringe 2 includes a cap 21, a lower shell 22, a hammer 24, an actuation spring 25, a washer 26, a rubber ring 27, an external push mechanism 28, an internal push mechanism 29, a hammer fixing component 210, an inner shell 211, an aluminum ring 212, a fixing component 213, a ball bearing 1 214, a ball bearing 215, a guide rail 1 216, a guide rail 217, a thrust ball bearing 218, a steel ball guide groove component 219, a locking steel ball 221, an inner button 1 222, a return spring 3 223, a stop block 224, a return spring 4 225, an inner button 2 226, a button 227, and an upper shell 228.

[0061] The lower shell 22 is snapped to the front end with a protective cap 21. The front end of the lower shell 22 has an internal thread. A hammer 24 is installed inside the lower shell 22. A washer ring 26 is located at the front end of the hammer 24, and an internal thread is located at the rear end of the hammer 24. An excitation spring 25 is mounted on the hammer 24 and contacts the washer ring 26. The rear end of the lower shell 22 has threads both inside and outside. An inner shell 211 is connected to the internal thread at the rear end of the lower shell 22. The inner shell 211 is fitted over the outer side of the excitation spring 25. An aluminum ring 212 is threaded to the external thread at the rear end of the lower shell 22 and contacts the lower shell 22 through a rubber ring 27. The hammer fixing component 210 is integrally formed with the hammer 24 via a threaded connection. The tail of the inner shell 211 is integrally formed with the ball guide groove component 219 by injection molding. The ball guide groove component 219 is located outside the hammer fixing component 210, and a locking ball 221 is installed on the ball guide groove component 219. The fixing component 213 is installed outside the tail end of the aluminum ring 212. A ball bearing 214 is installed on the fixing component 213 and mates with the inner groove at the tail end of the inner shell 211. The thrust ball bearing 218 is installed inside the inner shell 211 and located at the tail end of the excitation spring 25. The upper shell 228 is sleeved on the aluminum ring 212. The ring 212 is externally connected to the front end via a fastener 213. A stop block 224 is located inside the upper shell 228 and positioned at the connection between the ball guide groove 219 and the inner shell 211. A return spring 225 is provided on one side of the stop block 224 and is vertically connected to the lower inner wall of the upper shell 228. Guide rail 1 216 and guide rail 217 are integrally injection molded with the upper shell 228 and located on the upper inner wall of the upper shell 228. An outer push mechanism 28 is mounted on an inner push mechanism 29, which is mounted on the surface of the upper shell 228. A ball bearing 215 is mounted on the inner push mechanism 29 and cooperates with guide rail 1 216. 16 and guide rail 217, the lower end of the inner pusher 29 is engaged with the inclined surface of the stop block 224, the inner button 1 222 is located at the inner end of the ball guide groove 219, the other end of the inner button 1 222 is equipped with a return spring 3 223, the inner button 226 is sleeved on the outer end of the ball guide groove 219 and connected to the button 227 by a thread, the button 226 is connected to the button 227 by a thread to form a whole, the button 227 is located at the end of the upper shell 228 and passes through it, the other end of the return spring 3 223 is connected to the inside of the button 227, and the inner shell 211 is also provided with a scale.

[0062] After assembly, before use, the actuation spring 25 is not pressurized, and the manual syringe 2 is in a relaxed state. At this time, hold the upper shell 228 and the lower shell 22 of the manual syringe 2 with both hands respectively, and manually rotate the upper shell 228 and the lower shell 22. The inner shell 211 and the lower shell 22 rotate relative to each other, thereby compressing the actuation spring 25 by the washer ring 26. The hammer fixing part 210 moves to the right, pushing the inner button 1 222 to the right. When the groove of the hammer fixing part 210 is radially aligned with the position of the locking steel ball 221, the button 227 moves to the right under the action of the reset spring 3 223, pushing the locking steel ball 221 into the groove of the hammer fixing part 210. The hammer 24 is locked by the locking steel ball 221 to complete the pressurization action.

[0063] At this time, the ampoule injection tube 1 and the manual syringe 2 are assembled together, and the core rod 111 is fastened to the hammer 24, so that the hammer 24 drives the core rod 111 to move together.

[0064] Then, by manually rotating the manual syringe 2, the inner shell 211 and the lower shell 22 rotate relative to each other, and the lower shell 22 moves to the left. The hammer 24 drives the core rod 111 to draw up the medicine. The ampoule injection tube 1 is placed vertically with the ampoule facing upward. The manual syringe 2 is rotated in the opposite direction to expel the air in the injection head 11. The manual syringe 2 is adjusted and rotated to complete the aspiration of the prescribed amount of medicine. If a new ampoule injection tube 1 is not replaced, the air venting operation is not required for subsequent aspiration and injection.

[0065] During injection, push the outer pusher 28 to the right to unlock the safety lock. Then press button 227 to release the pressure of the reset spring 3 223, squeeze the inner button 1 222, and then push the hammer fixing part 210 and the hammer 24. At the same time, the inner button 2 226 moves to the left, and the locking steel ball 221 contacts the locking of the hammer fixing part 210. At this time, the spring 25 is activated to release the pressure, so that the hammer 24 drives the core rod 111 to move, thereby completing the injection of the medicine. The injector returns to its original state.

[0066] like Figure 6 and Figure 7 As shown, the automatic injector 3 includes a shell 31, an ampoule fixing bayonet 32, a voice coil motor module 33, a voice coil motor driver and touch screen 34, a safety lock 35, a ball bearing 36, a trigger 37, a return spring 38, a micro switch 39, a small stop block 310, a decorative cover 311, and a shell bottom 312.

[0067] The upper shell 31 and the lower shell 312 constitute the outer shell of the auto-injector 3. Inside the outer shell, a voice coil motor module 33 is installed in the upper part. An ampoule fixing bayonet 32 ​​is installed at the front end of the voice coil motor module 33. A voice coil motor driver and a touch screen 34 are installed at the rightmost end of the outer shell of the auto-injector 3 formed by the upper shell 31 and the lower shell 312. A trigger 37 is installed at the middle trigger port of the outer shell of the auto-injector 3 formed by the upper shell 31 and the lower shell 312. A safety lock 35 is installed above the trigger 37 and located at the mating point of the lower shell 312. A ball 36 is installed on the safety lock 35 and cooperates with the trigger 37 below. A return spring 38 is installed inside the trigger 37 and cooperates with the lower shell 312. A micro switch 39 is installed inside the lower shell 312 and located below the trigger 37 and works with the trigger 37. A small stop block 310 is installed to the right of the micro switch 39. A decorative cover 311 is installed at the bottom of the outer shell of the auto-injector 3 formed by the upper shell 31 and the lower shell 312.

[0068] A voice coil motor is a linear motor that operates based on the Lorentz force principle. It has a simple structure, fast response, and high precision, and is widely used in precision positioning, optical focusing (such as mobile phone cameras), vibration control and other fields.

[0069] This application uses a closed-loop force-controlled voice coil motor. Pressure is detected in real time by pressure sensors at both ends of the driver and the voice coil motor module, and the pressure is fed back to the driver. The driver adjusts the output current in real time according to the feedback pressure, and precisely controls the output thrust to meet the constant thrust during needle-free injection, ensuring that the injection depth reaches the expected injection site.

[0070] By switching the polarity of the current, the direction of motion of the voice coil motor can be changed. When the forward rapid motion provides power and injection dosage, the reverse slow motion can complete the drug aspiration action.

[0071] like Figure 8 As shown, the voice coil motor module 33 includes a rigid magnetic flux circuit 331, a permanent magnet 332, a return spring 333, a coil 334, a moving part 335, a slide table 336, a small hammer 337, and a small guide rail 338.

[0072] The rigid magnetic flux circuit 331 has a cylinder in the middle and a small guide rail 338 at the bottom. The permanent magnet 332 is fixed inside the rigid magnetic flux circuit 331. The coil 334 is sleeved on the outside of the moving part 335. The return spring 333 is sleeved on the cylinder inside the rigid magnetic flux circuit 331. The moving part 335 is sleeved on the cylinder inside the rigid magnetic flux circuit 331 and is located to the right of the return spring 333. The right end of the moving part 335 has a thread. The left end of the small hammer 337 is fixed to the moving part 335 by the thread. The moving part 335 is fixed to the slide table 336. The small hammer 337 passes through the notch on the right side of the slide table 336. The slide table 336 has a groove. The rigid magnetic flux circuit 331 is slidably connected to the slide table 336 by the bottom small guide rail 338. The slide table 336 is equipped with a position sensor and a pressure sensor.

[0073] The voice coil motor module 33, the voice coil motor driver, the touch screen 34, and the micro switch 39 are connected together via a data cable. The voice coil motor driver and the touch screen 34 serve as the control center, which can set the injection dosage and injection force; it can receive data from the position sensor and the pressure sensor, and adjust the output current through PID calculation to control the injection force in real time to meet the set value; according to the operation process design, the positive and negative plates of the voice coil motor are switched to change the movement direction of the moving parts, thereby realizing the drug suction and injection actions.

[0074] When using it, first set the injection dose and the corresponding injection force, then tighten the ampoule injection tube 1 to the ampoule fixing buckle 32 of the auto-injector 3 to fix the ampoule injection tube 1 on the auto-injector 3, and then assemble the liquid bottle and Luer adapter 19 together.

[0075] At this time, when trigger 37 is pressed, micro switch 39 is activated, and voice coil motor module 33 completes electromagnetic energy storage and full-dose drug absorption; at the same time, safety lock 35 is also activated on trigger 37, and unlocked through ball bearing 36; through program control, when the ampoule injection tube 1 is installed and used for the first time, the air in the injection head 11 cavity of the ampoule injection tube 1 will be automatically purged. If a new ampoule injection tube 1 is not replaced, the purging operation will not be performed for subsequent drug absorption and injection.

[0076] Finally, press trigger 37 to complete the injection; press trigger 37 repeatedly to complete the injection of all the medication.

[0077] The above steps can be repeated to complete continuous drug inhalation and injection.

[0078] A convex lens 23 is installed on the upper outer wall of the lower shell 22 to facilitate viewing the markings on the inner shell 211.

[0079] Two sets of decorative parts 220 are installed on the outer wall of the upper shell 228.

[0080] The present invention also provides a method of using an injection device, including a method of using an ampoule injection tube 1, a method of using a manual syringe 2, and a method of using an automatic syringe 3;

[0081] The method of using the ampoule injection tube 1 includes the following steps:

[0082] (1.1) The medicine bottle is connected to the ampoule shell 15 via a Luer adapter 19;

[0083] (1.2) The piston 110 is connected to the core rod 111, and the two move together;

[0084] (1.3) The core rod 111 is pulled from the left side of the cavity of the ampoule shell 15 to the right, and a negative pressure is generated in the cavity. When the negative pressure exceeds the pressure of the reset spring 16, the sealing rod 17 is released, and the liquid in the medicine bottle enters the inner cavity of the ampoule shell 15 through the connecting tube.

[0085] (1.4) The core rod 111 is pushed to the left. The sealing rod 17 seals the connecting tube under the pressure of the liquid and the return spring 16 to prevent the liquid from returning to the liquid bottle. When the liquid pressure is greater than the pressure of the return spring 13, the sealing rod 14 moves to the left. The inner cavity of the injection head 11 is connected to the inner cavity of the ampoule shell 15. The inner cavity of the injection head 11 is filled with liquid. The internal air is discharged through the spray hole under the action of the liquid. The core rod 111 moves back and forth left and right to draw up the required amount of liquid.

[0086] (1.5) The injector applies sufficient excitation force to the core rod 111, and the liquid medicine in the inner cavity of the ampoule shell 15 is sprayed out through the nozzle of the injection head 11 to complete the injection of the liquid medicine.

[0087] The method of using the manual syringe 2 includes the following steps:

[0088] (2.1) The spring 25 is not pressurized, and the manual syringe 2 is in a relaxed state;

[0089] (2.2) Hold the upper shell 228 and lower shell 22 of the manual syringe 2 with both hands respectively, rotate the upper shell 228 and lower shell 22 manually to compress the excitation spring 25, the hammer fixing part 210 moves to the right, push the inner button 1 222 to the right, when the groove of the hammer fixing part 210 is radially aligned with the position of the locking steel ball 221, the button 227 moves to the right under the action of the reset spring 3 223, pushing the locking steel ball 221 into the groove of the hammer fixing part 210, and the hammer 24 is locked by the locking steel ball 221 to complete the pressurization action;

[0090] (2.3) Assemble the ampoule injection tube 1 and the manual syringe 2 together, and fasten the core rod 111 and the hammer 24 together. The hammer 24 drives the core rod 111 to move together.

[0091] (2.4) Manually rotate the manual syringe 2, the lower shell 22 moves to the left, the hammer 24 drives the core rod 111 to draw up the medicine, place the ampoule injection tube 1 vertically upward, rotate the manual syringe 2 in the opposite direction to expel the air in the injection head 11, adjust the rotation of the manual syringe 2 to complete the aspiration of the specified amount of medicine; if a new ampoule injection tube 1 is not replaced, the air venting operation is not required for subsequent aspiration and injection.

[0092] (2.5) Push the push button 28 to the right to unlock the safety lock, press button 227 to complete the injection of medicine, and the injector returns to its original state.

[0093] The method of using the automatic injector 3 includes the following steps:

[0094] (3.1) Set the injection dose and corresponding injection force;

[0095] (3.2) Tighten the ampoule injection tube 1 and the ampoule fixing clip 32 of the auto-injector 3;

[0096] (3.3) The medicine bottle and Luer adapter 19 are assembled together;

[0097] (3.4) Press the trigger 37 to complete the electromagnetic energy storage and full dose of drug liquid aspiration; through program control, when the ampoule injection tube 1 is installed and used for the first time, the air in the injection head 11 cavity of the ampoule injection tube 1 will be automatically discharged. If the ampoule injection tube 1 is not replaced, the air venting operation will not be performed for subsequent drug aspiration and injection.

[0098] (3.5) Press trigger 37 to complete the injection of the drug solution; press trigger 37 continuously to complete the injection of all the drugs solution.

[0099] (3.6) Repeat steps 3.4 and 3.5 to complete continuous inhalation and injection.

Claims

1. An injection device, characterized in that The application relates to an ampoule injection medicine tube (1) and a needleless injector, wherein the ampoule injection medicine tube (1) is installed at the front end of the needleless injector. The ampoule injection medicine tube (1) comprises an injection head (11), a sealing ring I (12), a reset spring I (13), a sealing rod I (14), an ampoule shell (15), a reset spring II (16), a sealing rod II (17), a sealing ring II (18), a Luer adapter (19), a piston (110) and a core rod (111), the ampoule shell (15) is provided with an inclined joint part, the front end interior and the rear end exterior are provided with threads, the injection head (11) is installed at the front end of the ampoule shell (15) through threads and is sealed with the sealing ring I (12), the reset spring I (13) is arranged in the injection head (11), the other end of the reset spring I (13) is provided with the sealing rod I (14), the reset spring II (16) is arranged in the inclined joint part of the ampoule shell (15), the reset spring II (16) is connected with the sealing rod II (17), the Luer adapter (19) is fixed on the inclined joint part of the ampoule shell (15) through threads, the sealing ring II (18) is sealed at the internal connection part of the Luer adapter (19) and the inclined joint part of the ampoule shell (15), the piston (110) is arranged in the ampoule shell (15), and the piston (110) is connected with the core rod (111). The needleless injector comprises a manual injector (2) and an automatic injector (3). The manual injector (2) comprises a cap (21), a lower shell (22), a hammer (24), a trigger spring (25), a gasket (26), a rubber ring (27), an outer push device (28), an inner push device (29), a hammer fixing member (210), an inner shell (211), an aluminum ring (212), a fixing member (213), a wave bead I (214), a wave bead II (215), a guide rail I (216), a guide rail II (217), a thrust ball bearing (218), a steel ball guide groove member (219), a locking steel ball (221), an inner key I (222), a reset spring III (223), a stop block (224), a reset spring IV (225), an inner key II (226), a key (227) and an upper shell (228). The lower shell (22) is buckle-connected with a cap (21) at the front end, the front end of the lower shell (22) is provided with an internal thread, the inside of the lower shell (22) is provided with a hammer (24), the front end of the hammer (24) is provided with a grommet (26), the tail end of the hammer (24) is provided with an internal thread, a trigger spring (25) is installed on the hammer (24) and contacts the grommet (26), the inside and outside of the tail end of the lower shell (22) are provided with threads, the tail end of the lower shell (22) is connected with an inner shell (211) through the internal thread, the inner shell (211) is sleeved outside the trigger spring (25), an aluminum ring (212) is screw-connected with the external thread of the tail end of the lower shell (22) and contacts the lower shell (22) through a rubber ring (27), a hammer fixing part (210) is screw-connected with the hammer (24) and forms an integral whole, the tail end of the inner shell (211) is integrally formed with a steel ball guide part (219) through injection molding, the steel ball guide part (219) is located outside the hammer fixing part (210), a locking steel ball (221) is installed on the steel ball guide part (219), a fixing part (213) is installed outside the tail end of the aluminum ring (212), a wave ball one (214) is installed on the fixing part (213) and cooperates with the inner groove of the tail end of the inner shell (211), a thrust ball bearing (218) is installed inside the inner shell (211) and is located at the tail end of the trigger spring (25), an upper shell (228) is sleeved outside the aluminum ring (212) and is integrally connected with the front end through the fixing part (213), a stop block (224) is located inside the upper shell (228) and is arranged at the connection position of the steel ball guide part (219) and the inner shell (211), a reset spring four (225) is arranged on one side of the stop block (224) and is vertically connected with the lower inner wall of the upper shell (228), a guide rail one (216) and a guide rail two (217) are integrally formed with the upper shell (228) through injection molding and are located on the upper inner wall of the upper shell (228), an outer push (28) is installed on an inner push (29), the inner push (29) is installed at the surface of the upper shell (228), a wave ball two (215) is installed on the inner push (29) and cooperates with the guide rail one (216) and the guide rail two (217), the lower end of the inner push (29) cooperates with the inclined surface of the stop block (224), an inner key one (222) is located inside the tail end of the steel ball guide part (219), a reset spring three (223) is installed on the other end of the inner key one (222), an inner key two (226) is sleeved outside the tail end of the steel ball guide part (219) and is screw-connected with a key (227), the key two (226) is screw-connected with the key (227) and forms an integral whole, the key (227) is located at the tail end of the upper shell (228) and penetrates, the other end of the reset spring three (223) is connected with the inside of the key (227).

2. An injection device according to claim 1, wherein, The automatic injector (3) comprises an upper shell (31), an ampoule fixing bayonet (32), a voice coil motor module (33), a voice coil motor driver and a touch screen (34), a safety lock (35), a wave ball three (36), a trigger (37), a reset spring five (38), a micro switch (39), a small stop block (310), a decorative cover (311) and a lower shell (312). The upper shell (31) and the lower shell (312) constitute the shell of the automatic injector (3), inside the shell, the upper part is provided with a voice coil motor module (33), the front end of the voice coil motor module (33) is provided with an ampoule fixing bayonet (32), the voice coil motor driver and the touch screen (34) are installed at the rightmost end of the shell constituted by the upper shell (31) and the lower shell (312), the trigger (37) is installed at the middle trigger port of the shell constituted by the upper shell (31) and the lower shell (312), the safety lock (35) is installed above the trigger (37) and located at the matching position of the lower shell (312), the wave bead three (36) is installed on the safety lock (35) and matched with the trigger (37) below, the reset spring five (38) is installed inside the trigger (37) and matched with the lower shell (312), the micro switch (39) is installed inside the lower shell (312) and located below the trigger (37) and matched with the trigger (37), the small stop block (310) is installed on the right side of the micro switch (39), and the decorative cover (311) is installed at the bottom of the shell constituted by the upper shell (31) and the lower shell (312).

3. An injection device according to claim 2, wherein, The voice coil motor module (33) comprises a rigid magnetic flux circuit (331), a permanent magnet (332), a reset spring six (333), a coil (334), a moving part (335), a sliding table (336), a small hammer (337) and a small guide rail (338); The middle of the rigid magnetic flux circuit (331) is provided with a cylinder and the bottom end is provided with a small guide rail (338), the permanent magnet (332) is fixed inside the rigid magnetic flux circuit (331), the coil (334) is sleeved outside the moving part (335), the reset spring six (333) is sleeved on the cylinder inside the rigid magnetic flux circuit (331), the moving part (335) is sleeved on the cylinder inside the rigid magnetic flux circuit (331) and located at the right side of the reset spring six (333), the right end of the moving part (335) is provided with a thread inside, the left end of the small hammer (337) is fixed with the moving part (335) through the thread, the moving part (335) is fixed with the sliding table (336), the small hammer (337) passes through the gap on the right side of the sliding table (336), a sliding groove is formed on the sliding table (336), the rigid magnetic flux circuit (331) is connected with the sliding groove of the sliding table (336) through the small guide rail (338) at the bottom, and a position sensor and a pressure sensor are installed on the sliding table (336).

4. The injection device of claim 1, wherein, The upper end outer wall of the lower shell (22) is provided with a convex lens (23).

5. The injection device of claim 1, wherein, The outer wall of the upper shell (228) is provided with two groups of decorative parts (220).

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