Needle-free injection device

Abstract

The present application provides a needle-free injection device, comprising a mechanical spring energy storage assembly, a seat force balance assembly, a closed-loop magneto-electric device adjustment assembly, an injector assembly and a circuit control assembly; the circuit control assembly is used to control the mechanical spring energy storage assembly to generate mechanical energy storage and instantaneous energy release; the seat force balance assembly is used to balance the seat force when the mechanical spring energy storage assembly releases the instantaneous energy; the closed-loop magneto-electric device adjustment assembly comprises a magnetic shaft and a coil on a magnetic shaft motor; the magnetic shaft is used to bear the impact force when the mechanical spring energy storage assembly releases the instantaneous energy and transmit the impact force to the injector assembly to inject liquid; the circuit control assembly adjusts the current of the coil according to the speed sensing signal of the magnetic shaft monitored by the coil to accelerate or decelerate the movement of the magnetic shaft. Through the design of the seat force balance assembly and the closed-loop magneto-electric device adjustment assembly, the present application can control the injection process, has low energy consumption, can solve the problem of the back seat force and has a small size.

Description

Technical Field

[0001] This invention relates to the field of medical equipment technology, specifically a needle-free injection device. Background Technology

[0002] In 1866, a French scientist first proposed the concept of "needle-free injection," and many scholars began to develop advanced syringes that do not require needles and rely on high-speed airflow to diffuse and inject medication into the patient's skin. After years of research and development, the world's first needle-free syringe was launched in Germany in 1992 and approved for use specifically for insulin injection.

[0003] Subsequently, needle-free injection, as a new injection technique in medical technology, has gradually expanded its application to various fields such as clinical practice. Injectors employing different principles, possessing different functions, and exhibiting various characteristics have gradually flooded the market. For example, the German-made INJEX compression spring injector allows for convenient single injections; the Chinese brand "QuickShuer" spring injector allows for multiple injections from a single filling; the American MIT injector, using the voice coil motor principle, can precisely control the injection speed; the injector from Jiangsu Changzhou Zhong'an Technology uses electromagnetic principles for continuous injection; and the Canadian "MIT" pneumatic continuous injector has expanded its application to facial care.

[0004] Each of the aforementioned inventions has its own advantages and disadvantages. For example, a small, single-spring syringe cannot control the injection process after firing; a voice coil syringe that can control the entire injection process consumes too much energy and is almost impractical; a syringe that uses an external gas and power supply and can inject continuously has a large recoil force, and the vibration is unacceptable; while a syringe without recoil force and without gas and power supply is too large to be small and portable. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a needle-free injection device that can control the injection process, consumes little energy, solves the recoil problem, and is compact in size.

[0006] A needle-free injection device includes a mechanical spring energy storage assembly, a force balancing assembly, a closed-loop magnetoelectric device adjustment assembly, a syringe assembly, and a circuit control assembly. The circuit control assembly controls the mechanical spring energy storage assembly to generate mechanical energy storage and release energy instantaneously. The force balancing assembly balances the force during the instantaneous energy release of the mechanical spring energy storage assembly. The closed-loop magnetoelectric device adjustment assembly includes a magnetic shaft and a coil on a magnetic shaft motor. The magnetic shaft receives the impact force during the instantaneous energy release of the mechanical spring energy storage assembly and transmits it to the syringe assembly for liquid injection. The coil monitors the speed of the magnetic shaft and transmits a speed sensing signal to the circuit control assembly. The circuit control assembly adjusts the current in the coil of the magnetic shaft motor based on the speed sensing signal to accelerate or decelerate the movement of the magnetic shaft.

[0007] Furthermore, the mechanical spring energy storage assembly includes a battery, a motor, a curved propulsion wheel, a main rack, and a power spring. The battery is connected to the motor, and the output shaft of the motor is driven by the curved propulsion wheel. The curved propulsion wheel includes a column and a spiral surface that spirals upward around the column. The motor is used to drive the curved propulsion wheel to rotate. The main rack is located on one side of the curved propulsion wheel, and a pawl is provided on the main rack located on the spiral surface. A power spring is connected to the upper part of the main rack.

[0008] Furthermore, the rotating curved propulsion wheel can drive the locator located on its helical surface, causing the locator to slowly move from the bottom of the helical surface to the top. During this process, the locator drives the main rack to move upward, applying pressure to the power spring to store energy. Then, it slides directly from the top of the surface to the bottom, and the locator drives the main rack to move downward, causing the energy stored in the compressed power spring to be released quickly.

[0009] Furthermore, the seat force balancing assembly includes an intermediate gear and a balancing rack. The main rack is meshed with the balancing rack through the intermediate gear. When the main rack moves downward, it drives the balancing rack to move in the opposite direction through the intermediate gear to balance the seat force.

[0010] Furthermore, a spring cap is provided on the upper part of the power spring, and the spring cap adjusts the compression space of the power spring by adjusting the screw, thereby adjusting the energy storage of the power spring.

[0011] Furthermore, the mechanical spring energy storage assembly includes a battery, a motor, a reduction gearbox, a needle roller clutch bearing, an eccentric balance wheel, a connecting shaft, an upper connecting rod core, a lower connecting rod, and an upper connecting rod sleeve. The battery is connected to the motor, the motor is connected to the reduction gearbox, the reduction gearbox is connected to the eccentric balance wheel via a needle roller clutch bearing that can only rotate in one direction, the eccentric balance wheel is connected to the connecting shaft, the connecting shaft is connected to the lower end of the upper connecting rod core and the upper end of the lower connecting rod, the lower end of the upper connecting rod sleeve is sleeved with the upper end of the upper connecting rod core, a power spring is sleeved on the upper connecting rod sleeve, the lower end of the lower connecting rod is connected to a slider, and the lower end of the slider is connected to the magnetic shaft of the closed-loop magnetoelectric device adjustment assembly.

[0012] Furthermore, the motor drives the reduction gearbox, and the output shaft of the reduction gearbox drives the eccentric balance wheel to rotate in one direction through the needle roller clutch bearing in the "engaged" state. This slowly rotates the connecting shaft in the lower position from the lower position to the higher position, compressing the power spring located between the upper connecting rod core and the upper connecting rod sleeve. When the connecting shaft rotates past the highest position, the eccentric balance wheel rotates at a higher speed than the output shaft of the reduction gearbox under the instantaneous release of the pressure from the power spring. The needle roller clutch bearing automatically enters the "disengaged" state, and the eccentric balance wheel moves rapidly downward through the connecting shaft, lower connecting rod, slider, and magnetic shaft in the magnetic shaft motor.

[0013] Furthermore, the top of the upper connecting rod sleeve is provided with a fixing hole, the position of which can be adjusted to change the length of compression of the power spring or the energy storage level.

[0014] Furthermore, the eccentric balance wheel is formed by fusing one end of a conventional crankshaft with a gravity balance block on the conventional crankshaft, the seat force balancing component is the gravity balance block on the eccentric balance wheel, and the connecting rod connecting shaft is the other end of the conventional crankshaft.

[0015] Furthermore, the syringe assembly includes an ampoule and an ampoule plunger disposed on the ampoule, the ampoule plunger being located below the magnetic shaft; the ampoule is externally connected to a liquid storage container, and the ampoule plunger is equipped with a return spring for completing the cyclic injection and drainage of the ampoule.

[0016] This invention, through the setting of a recoil balancing component, can balance the recoil force when the mechanical spring energy storage component releases energy instantaneously, making the instantaneous vibration release more acceptable during injection. Moreover, the structure is simple, easy to implement, and does not increase the size of the device. By adjusting the magnetic shaft and coil in the closed-loop magnetoelectric device adjustment component, the impact force on the syringe component during the instantaneous energy release of the mechanical spring energy storage component can be monitored and adjusted in real time, thereby adjusting the injection speed as needed. This works in conjunction with the recoil balancing component to achieve the goals of controlling the injection process, low energy consumption, solving the recoil problem, and compact size. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the needle-free injection device of the present invention;

[0018] Figure 2 This is a schematic diagram of the curved surface propulsion wheel in Embodiment 1 of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the needle-free injection device of the present invention;

[0020] In the diagram: 1—Battery, 2—Motor, 3—Curved surface propulsion wheel, 4—Main rack, 5—Power spring, 6—Spring cap, 7—Intermediate gear, 8—Balance rack, 9—Magnetic shaft, 10—Coil, 11—Ampoule, 12—Ampoule push rod, 13—Return spring, 14—Reduction gearbox, 15—Needle roller clutch bearing, 16—Eccentric balance wheel, 17—Connecting rod shaft, 18—Upper connecting rod core, 19—Lower connecting rod, 20—Upper connecting rod sleeve, 21—Fixing hole, 22—Slider, 23—Liquid storage container, 31—Cylinder, 32—Helical surface, 33—Bottom of curved surface, 34—Top of curved surface. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] Please see Figure 1 This embodiment provides a needle-free injection device, including a mechanical spring energy storage component, a seat force balancing component, a closed-loop magnetoelectric device adjustment component, and a syringe component.

[0024] The mechanical spring energy storage assembly includes a battery 1, a motor 2, a curved propulsion wheel 3, a main rack 4, a power spring 5, and a spring cap 6. The battery 1 is connected to the motor 2 to provide power to the motor 2. The battery is one or more rechargeable 18650 / 26650 lithium batteries or dedicated lithium batteries. The motor 2 can be a high-power-density, high-energy-conversion-rate DC permanent magnet brushless motor or a synchronous reluctance motor. The output shaft of the motor 2 is driven by the curved propulsion wheel 3. Figure 2As shown, the curved propulsion wheel 3 includes a column 31 and a spiral curved surface 32 that spirals upward around the column 31. The motor 2 and the gear reducer are integrated and can drive the curved propulsion wheel 3 to rotate. The main rack 4 is located on one side of the curved propulsion wheel 3, and the main rack 4 is provided with a pawl 41 located on the spiral curved surface 32.

[0025] The seat force balancing assembly includes an intermediate gear 7 and a balancing rack 8, with the main rack 4 meshing with the balancing rack 8 through the intermediate gear 7.

[0026] The rotating curved propulsion wheel 3 drives the shift post 41 located on its helical surface 32, allowing the shift post 41 to slowly move from the bottom 33 of the helical surface 32 to the top 34, and then slide directly from the top 34 back to the bottom 33. The movement of the shift post 41 drives the main rack 4, which is integrally connected to it, to move as well. Because the main rack 4 is restricted by a groove (not shown), it can only slide in a straight line. The main rack 4, in turn, drives the balancing rack 8, which is also restricted by a groove (not shown), to move in the opposite direction via the intermediate gear 7.

[0027] A power spring 5 is connected to the upper part of the main rack 4. The movement of the shift pin 41 from the bottom to the top of the helical surface 32 can drive the main rack 4 to move upward, applying pressure to the power spring 5 and accumulating energy. A spring cap 6 is provided on the upper part of the power spring 5. The spring cap 6 can adjust the compression space of the power spring 5 by adjusting the screw, thereby adjusting the energy storage of the power spring 5. As the curved propulsion wheel 4 rotates, the shift pin 41 will be moved out of the top of the helical surface 32 and lose support. At this time, the shift pin 41 can slide quickly from the top to the bottom of the helical surface 32. The shift pin 41 drives the main rack 4 to move downward, allowing the energy of the compressed power spring 5 to be released quickly. At the same time, the main rack 4 drives the balance rack 8 to move in the opposite direction through the intermediate gear 7, which can balance the sitting force.

[0028] The closed-loop magnetoelectric device adjustment assembly includes a magnetic shaft 9 and a coil 10 on a magnetic shaft motor. The magnetic shaft 9 is connected to the lower end of the main rack 4. The coil 10 is provided on the outside of the magnetic shaft 9. The movement speed of the magnetic shaft 9 can be sensed by the coil 10 of the magnetic shaft motor or a Hall sensor (not shown) to obtain a relevant speed sensing signal. The controller connected to the magnetic shaft motor can adjust the current of the coil 10 of the magnetic shaft motor according to the speed sensing signal of the magnetic shaft 9 to adjust the movement of the magnetic shaft 9 by accelerating or decelerating.

[0029] The syringe assembly includes an ampoule 11 and an ampoule push rod 12 disposed on the ampoule 11; the ampoule push rod 12 is disposed below the magnetic shaft 6, and the magnetic shaft 9, which moves downward at a specific speed, can strike the ampoule push rod 12, and during the striking process, the speed is continuously adjusted according to the program setting to inject the liquid in the ampoule 11 into the desired place.

[0030] This embodiment may also include a circuit control component electrically connected to the mechanical spring energy storage component. This component has a touchscreen display module and, through a human-machine interface control program, can manipulate the entire needle-free injection process, including the energy storage and instantaneous energy release of the mechanical spring energy storage component, the elimination of the sitting force by the sitting force balancing component, and the adjustment of the injection speed of the syringe component by the closed-loop magnetoelectric device adjustment component. Specifically, during use, the desired syringe operation program is selected via the touchscreen display module. The operation program powers the battery 1 inside the syringe to start the motor 2, which, through gear reduction and other mechanical operations, compresses and stores energy in the power spring 5. Subsequently, the power spring 5 rapidly releases energy, driving the main rack 4, which contains the sitting force balancing component, to move rapidly in a straight line. A magnetoelectric device (coil 10 of a magnetic shaft motor or a Hall sensor) is installed on the main rack 4, which can provide closed-loop signal feedback to the control program. This allows the control program to adjust the instantaneous speed of the main rack 4 in real time based on the received signal via the magnetoelectric device. Then, the main rack 4 injects the liquid in the ampoule 11 into the desired location by striking the ampoule push rod 12 of the needle-free ampoule. The movement state of the main rack 4 can be easily sensed by limit switches and other sensors through the circuit control components, and it can be commanded to perform single or continuous strikes. Of course, when performing continuous strikes, it can be used in conjunction with the multi-injector shown in Example 2 to perform continuous injections.

[0031] This embodiment has the following features: First, by using a small-sized, high-power-density, high-energy-conversion-rate DC permanent magnet brushless or synchronous reluctance motor, this motor can be easily placed in a portable syringe; second, by utilizing the motor's high energy conversion rate of 90-95%, and in conjunction with a geared motor, one or several lithium batteries are sufficient to power the spring and complete the injection task; third, in the design, the main rack 4 coupled to the intermediate gear 7 and the balance rack 8, along with their associated linkages, are balanced in overall mass, resulting in a smaller recoil force during needle-free injection compared to conventional recoil forces; finally, and more importantly, a closed-loop feedback magnetoelectric device is used to fine-tune the moving magnetic shaft 9, thus avoiding the huge energy demand of voice coil motor-type needle-free syringes during startup and enabling perfect real-time adjustment of the injection speed.

[0032] Example 2

[0033] Embodiment 2 is based on Embodiment 1, and adopts an eccentric balance wheel 16 that can only rotate in one direction and a connecting rod, thus optimizing the invention from another aspect.

[0034] In this embodiment, the mechanical spring energy storage assembly includes a battery 1, a motor 2, a reduction gearbox 14, a needle roller clutch bearing 15, an eccentric balance wheel 16, a connecting rod connecting shaft 17, an upper connecting rod core 18, a lower connecting rod 19, and an upper connecting rod sleeve 20.

[0035] like Figure 3 As shown, the same battery 1 and motor 2 as in Embodiment 1 are used here. Motor 2 is connected to reduction gearbox 14, and reduction gearbox 14 is connected to eccentric balance wheel 16 through needle roller clutch bearing 15, which can only rotate in one direction. Eccentric balance wheel 16 can be considered as one end of a conventional crankshaft fused with a gravity balance block on a conventional crankshaft. In this embodiment, the seat balancing component is the gravity balance block on eccentric balance wheel 16.

[0036] An eccentric balance wheel 16 is connected to a connecting shaft 17, which can be considered the other end of a conventional crankshaft. The connecting shaft 17 is connected to the lower end of the upper connecting rod core 18 and the upper end of the lower connecting rod 19. The lower end of the upper connecting rod sleeve 20 is sleeved with the upper end of the upper connecting rod core 18, and a power spring 5 is fitted on the upper connecting rod sleeve 20. The top of the upper connecting rod sleeve 20 has a fixing hole 21, the position of which is adjustable, thereby changing the compression distance or energy storage level of the power spring 20. The lower end of the lower connecting rod 19 is connected to a slider 22, and the lower end of the slider 22 can be connected to a closed-loop magnetoelectric device adjustment component, such as the magnetic shaft 9 of a magnetic shaft motor and an external coil 10. The lower end of the magnetic shaft 9 can strike the ampoule push rod 12 to output the liquid medicine in the ampoule 11. In this embodiment, the ampoule 11 is connected to a liquid storage container 23, which can be set with a universal double check valve (not shown). The ampoule push rod 12 is equipped with a return spring 13, which is used to complete the circulation filling and drainage of the ampoule 11.

[0037] The actual working process of Example 2 is as follows:

[0038] The user selects to start the control program from the touchscreen display module in the circuit control component. The control program powers the motor 2, which drives the reduction gearbox 14. The output shaft of the reduction gearbox 14, through the engaged needle roller clutch bearing 15, drives the eccentric balance wheel 16 to rotate in one direction, slowly rotating the connecting shaft 17 from its low position to its high position, compressing the power spring 5 located between the upper connecting rod core 18 and the upper connecting rod sleeve 20. When the connecting shaft 17 has rotated to its highest position, the eccentric balance wheel 16, driven by the instantaneous release of pressure from the power spring 5, rotates at a higher speed than the output shaft of the reduction gearbox 14, and the needle roller clutch bearing 15 automatically disengages. The eccentric balance wheel 16 then moves rapidly downwards through the connecting shaft 17, the lower connecting rod 19, the slider 22, and the magnetic shaft 9 in the magnetic shaft motor. The coil 10 or Hall sensor outside the magnetic shaft 9 senses the movement of the magnetic shaft 9 and transmits the signal to the control program. Based on these signals, the control program sends a corresponding current to the coil 9 of the magnetic shaft motor according to the speed of the magnetic shaft 9, and adjusts the speed of the magnetic shaft 9 to accelerate or decelerate it. This drives the magnetic shaft, which moves downward at a specific speed, to strike the ampoule push rod 12 at its lower part. During the striking process, the speed is continuously adjusted according to the program settings to inject the liquid in the ampoule 11 into the desired location.

[0039] After injection, the pressure of the power spring 5 is completely released, and the rotational speed of the eccentric balance wheel 16 decreases. Through the needle roller clutch bearing 15 and the integrated reduction motor, the eccentric balance wheel 16 continues to drive the connecting shaft 17, which is in a low position, slowly rotating it from a low position to a high position, beginning the next cycle of the power spring 5's compression. As the magnetic shaft 9 moves upward, the return spring 13 of the ampoule pusher 12 moves the ampoule pusher 12 upward, drawing liquid from the reservoir 23, completing preparation for the next injection. As needed, the control program can manipulate the syringe assembly to continuously inject until the solution in the reservoir 23 is depleted.

[0040] The features of this embodiment are that, based on motor energy storage and closed-loop magnetoelectric regulation, a crankshaft is used to reciprocate and drive the ampoule push rod. An eccentric balance wheel 16 is used to carefully balance the mass of each component on the crankshaft and counteract the sitting force caused by the instantaneous energy release of the power spring 5. A one-way rotating needle roller clutch bearing 15 is used to simplify the control of the instantaneous energy release of the power spring 5. A liquid storage container 23 and a one-way valve are used to make continuous injection possible.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A needle-free injection device, characterized in that: The system includes a mechanical spring energy storage assembly, a force balancing assembly, a closed-loop magnetoelectric device adjustment assembly, a syringe assembly, and a circuit control assembly. The circuit control assembly controls the mechanical spring energy storage assembly to generate mechanical energy storage and release it instantaneously. The force balancing assembly balances the force during the instantaneous energy release of the mechanical spring energy storage assembly. The closed-loop magnetoelectric device adjustment assembly includes a magnetic shaft and a coil on a magnetic shaft motor. The magnetic shaft receives the impact force during the instantaneous energy release of the mechanical spring energy storage assembly and transmits it to the syringe assembly for liquid injection. The coil monitors the speed of the magnetic shaft and transmits the speed sensing signal to the circuit control assembly. The circuit control assembly adjusts the current in the coil of the magnetic shaft motor based on the speed sensing signal to accelerate or decelerate the movement of the magnetic shaft. The mechanical spring energy storage assembly includes a battery, a motor, a reduction gearbox, a needle roller clutch bearing, an eccentric balance wheel, a connecting rod shaft, an upper connecting rod core, a lower connecting rod, and an upper connecting rod sleeve. The battery is connected to the motor, and the motor is connected to the reduction gearbox. The gearbox, a reduction gearbox, is connected to an eccentric balance wheel via a needle roller clutch bearing that rotates only in one direction. A connecting shaft is connected to the eccentric balance wheel, and this shaft connects to the lower end of the upper connecting rod core and the upper end of the lower connecting rod. The lower end of the upper connecting rod sleeve is fitted onto the upper end of the upper connecting rod core, and a power spring is fitted onto the upper connecting rod sleeve. The lower end of the lower connecting rod is connected to a slider, and the lower end of the slider is connected to the magnetic shaft of the closed-loop magnetoelectric device adjustment assembly. The motor drives the reduction gearbox, and the output shaft of the reduction gearbox is connected to the needle roller clutch in the "engaged" state. The bearing drives the eccentric balance wheel to rotate in one direction, slowly rotating the connecting shaft from the low position to the high position, compressing the power spring located between the upper connecting rod core and the upper connecting rod sleeve. When the connecting shaft rotates past the highest position, the eccentric balance wheel, driven by the instantaneous release of the pressure from the power spring, rotates at a higher speed than the output shaft of the reduction gearbox. The needle roller clutch bearing automatically enters the "disengaged" state, and the eccentric balance wheel moves rapidly downward through the connecting shaft, lower connecting rod, slider, and magnetic shaft in the magnetic shaft motor.

2. The needle-free injection device as described in claim 1, characterized in that: The top of the upper connecting rod sleeve is provided with a fixing hole, the position of which can be adjusted to change the length of compression of the power spring or the energy storage level.

3. The needle-free injection device as described in claim 1, characterized in that: The eccentric balance wheel is formed by fusing one end of a conventional crankshaft with a gravity balance block on the conventional crankshaft, the seat balance component is the gravity balance block on the eccentric balance wheel, and the connecting rod connecting shaft is the other end of the conventional crankshaft.

4. The needle-free injection device according to any one of claims 1-3, characterized in that: The syringe assembly includes an ampoule and an ampoule plunger disposed on the ampoule, the ampoule plunger being located below the magnetic shaft; the ampoule is connected to a liquid storage container, and the ampoule plunger is equipped with a return spring for completing the cyclic injection and drainage of the ampoule.

Images