Painless automatic injector

Abstract

A painless automatic injector, the medical instrument technical field, include: main body, ejector assembly, energy storage assembly and push medicine assembly, the inside front end of the main body is fixed with ejector assembly, the inside of the main body is fixed with energy storage assembly, the energy storage assembly is below ejector assembly, the inside rear end of the main body is fixed with push medicine assembly.The beneficial effects of the present application are: one-way operation of the component, simple and stable structure, low production cost, convenient maintenance, strong clinical durability, high-speed ejection painless injection realizes the rapid puncture of the needle, the needle insertion speed is fast, the stimulation time is short, the patient's injection pain is reduced from the root, the painless injection effect is stable, the patient's injection compliance is improved, the needle tip is not exposed throughout, completely eliminates accidental puncture of medical staff during operation and recovery of equipment, blocks the cross infection path, and the clinical use is safer, the push medicine speed can be adjusted flexibly according to the viscosity of the liquid medicine and the injection population, and the application scene is more extensive.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, and in particular to a painless automatic injector. Background Technology

[0002] Existing clinical injection devices and commercially available auxiliary injection devices generally suffer from the following technical shortcomings: First, traditional manual syringes rely on manual needle insertion and medication injection, resulting in slow needle insertion speed, uneven injection force, and a high risk of causing patient pain and panic. Furthermore, the needle is prone to deviation, making it difficult to guarantee injection accuracy. Second, most existing semi-automatic ejector syringes use manually compressed springs for energy storage, which involves cumbersome operation steps and inconsistent storage capacity, failing to achieve standardized and streamlined injection procedures. Third, most devices can only complete the needle insertion action; medication injection still relies on manual operation, resulting in extremely low automation throughout the process. Fourth, needle removal after injection also requires manual operation, leading to fragmented procedures that not only increase the workload of medical staff but also easily exacerbate patient discomfort due to disrupted operating rhythms.

[0003] Currently, there is no one-button injection device that integrates automatic energy storage, spring-loaded rapid needle insertion, automatic drug delivery, and automatic needle withdrawal. It is impossible to achieve fully automated closed-loop control of the entire process of needle insertion, drug delivery, and needle withdrawal, which makes it difficult to meet the clinical needs for painless, efficient, and standardized injection. Therefore, it is urgent to optimize and improve the structure of existing automatic injection devices. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide a painless automatic injector.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A painless automatic injector includes: a main body, an ejection assembly, an energy storage assembly, and a drug delivery assembly. The ejection assembly is fixed at the front end inside the main body, the energy storage assembly is fixed inside the main body and located below the ejection assembly, and the drug delivery assembly is fixed at the rear end inside the main body.

[0007] The main body includes: a shell, a drug-pushing guide elongated hole, an ejection guide elongated hole, a needle fixing clamp, a handle, a battery, a main switch SB1, and a speed control switch. The top surface of the shell has a drug-pushing guide elongated hole and an ejection guide elongated hole along its length. The top surface of the shell has a needle fixing clamp, which is located between the drug-pushing guide elongated hole and the ejection guide elongated hole. The lower end of the shell has a handle, and the handle contains a battery. The handle has a main switch SB1, and the lower end of the shell has a speed control switch. Both the main switch SB1 and the speed control switch are electrically connected to the battery.

[0008] The ejection assembly includes: a guide rod, an adjusting nut, a spring, an ejection clamp, a needle limit bracket, a reset top block, and a power-off switch SB2. A guide rod is fixed to the front end inside the housing, with its front end extending out of the housing. The rear surface of the guide rod has an external thread. The adjusting nut is screwed onto the guide rod via the external thread. A spring is fitted onto the guide rod. An ejection clamp is slidably connected to the guide rod, sliding within an ejection guide hole. The side walls of the ejection clamp slidably fit against the side surfaces of the ejection guide hole. The spring is positioned between the adjusting nut and the ejection clamp. A needle limit bracket is fixed to the front end of the guide rod. A reset top block is fixed to the lower end of the ejection clamp. A power-off switch SB2 is fixed to the top surface inside the housing. The power-off switch SB2 works in conjunction with the reset top block and is electrically connected to a battery.

[0009] The energy storage component includes: a reducer, a drive motor, a rotating wheel, an eccentric rod, and a drug-pushing switch. The reducer is fixed to the bottom surface of the inner shell, and the drive motor is fixed to the upper end of the reducer. The output shaft of the drive motor is fixedly connected to the input end of the reducer. The rotating wheel is fixed to the output end of the reducer, and an eccentric rod is eccentrically fixed to the upper end of the rotating wheel. The drug-pushing switch is fixed to the inner side of the front end of the outer shell. The reset top block is used in conjunction with the eccentric rod and the drug-pushing switch. The drive motor and the drug-pushing switch are both electrically connected to the battery. The power-off switch SB2 is connected to the drive motor via a wire.

[0010] The drug-pushing assembly includes: a second drive motor, a screw, and a drug-pushing plate. The second drive motor is fixed to the rear end of the top surface of the housing. One end of the screw is fixedly connected to the output shaft of the second drive motor, and the other end of the screw is rotatably connected to the inner side of the rear end of the housing. The drug-pushing plate is screwed onto the screw and slides within the elongated drug-pushing guide hole. The two sides of the drug-pushing plate slide against the two sides of the elongated drug-pushing guide hole. The speed control switch and the drug-pushing switch are both connected to the second drive motor via wires. The second drive motor is electrically connected to the battery.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The energy storage component operates in one direction and has a simple and stable structure: It abandons the design of forward and reverse motor and external control module, and adopts a reducer and drive motor to rotate continuously in one direction. There are no complicated circuits or control chips, which greatly simplifies the internal structure, makes it stable in operation and not prone to failure, has low production cost, is convenient for later maintenance, and has extremely strong clinical durability.

[0013] 2. The injection syringe achieves flexible connection between the needle and the drug reservoir via a double Luer connector tubing. The connector is tightly sealed, quick to assemble and disassemble, with no risk of leakage or air ingress. The tubing can be bent freely, allowing for flexible adjustment of the injection angle, making it suitable for injection scenarios at multiple sites throughout the body, greatly improving its flexibility of use.

[0014] 3. The drive motor is directly controlled by a dual-control button with a main switch and a power-off switch. A single press drives the rotating wheel and eccentric rod to rotate in one direction, sequentially completing the entire set of actions: spring energy storage, high-speed ejection of the needle, automatic drug delivery, automatic needle withdrawal, and needle concealment. No step-by-step operation is required, and injection can be completed with one hand, greatly simplifying the medical and nursing operation process and improving injection efficiency.

[0015] 4. High-speed ejection painless injection: Relying on spring energy storage and instantaneous elastic release, the needle can be inserted at extremely fast speed. The needle insertion speed is fast and the stimulation time is short, which reduces the patient's injection pain from the root. The painless injection effect is stable and improves the patient's injection compliance.

[0016] 5. Complete needle concealment to prevent punctures: After needle removal, the needle automatically and completely retracts behind the needle holder, with the needle tip never exposed. This completely eliminates the possibility of accidental punctures during medical staff operation and instrument retrieval, blocks cross-infection routes, and enhances clinical safety.

[0017] 6. Adjustable and adaptable drug delivery speed: Equipped with an external speed control switch, the speed of the drive motor can be flexibly adjusted according to the viscosity of the drug solution and the injection population to achieve automatic drug delivery speed, adapting to various drug solutions and the injection needs of adults and children, making it applicable to a wider range of scenarios. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall internal structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the ejection assembly and energy storage assembly.

[0020] Figure 3 This is a top view of the rotating wheel;

[0021] Figure 4 This is a top view of the overall structure;

[0022] Figure 5 This is a schematic diagram of the circuit connection and operation of the drive motor. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] Combination Figure 1-5Description: A painless automatic injector includes: a main body 1, an ejection assembly 2, an energy storage assembly 3, and a drug delivery assembly 4. The ejection assembly 2 is fixed at the front end inside the main body 1, the energy storage assembly 3 is fixed inside the main body 1 and is located below the ejection assembly 2, and the drug delivery assembly 4 is fixed at the rear end inside the main body 1.

[0025] The main body 1 includes: a shell 1-1, a drug-pushing guide elongated hole 1-2, an ejection guide elongated hole 1-3, a needle tube fixing clamp 1-4, a handle 1-5, a battery 1-6, a main switch SB11-7, and a speed control switch 1-8. The top surface of the shell 1-1 is provided with the drug-pushing guide elongated hole 1-2 and the ejection guide elongated hole 1-3 along its length. The top surface of the shell 1-1 is provided with the needle tube fixing clamp 1-4, which is located between the drug-pushing guide elongated hole 1-2 and the ejection guide elongated hole 1-3. The lower end of the shell 1-1 is provided with the handle 1-5, and the battery 1-6 is disposed inside the handle 1-5. The main switch SB11-7 is disposed on the handle 1-5. The lower end of the shell 1-1 is provided with the speed control switch 1-8. Both the main switch SB11-7 and the speed control switch 1-8 are electrically connected to the battery 1-6.

[0026] Furthermore, the speed of the drive motor can be adjusted by speed control switches 1-8 to achieve automatic drug delivery speed. This speed can be flexibly adjusted according to the viscosity of the drug solution, the injection population, the compatibility with various drug solutions, and the injection needs of adults and children, making it applicable to a wider range of scenarios.

[0027] The ejection assembly 2 includes: a guide rod 2-1, an adjusting nut 2-2, a spring 2-3, an ejection clip 2-4, a needle limit bracket 2-5, a reset top block 2-6, and a power-off switch SB22-7. The guide rod 2-1 is fixedly mounted at the front end inside the outer casing 1-1, with the front end of the guide rod 2-1 extending out of the outer casing 1-1. The rear end surface of the guide rod 2-1 has an external thread. The adjusting nut 2-2 is screwed onto the guide rod 2-1 via the external thread. The spring 2-3 is fitted onto the guide rod 2-1, and the ejection clip 2-4 is slidably connected to the guide rod 2-1. The ejector clip 2-4 slides within the ejection guide elongated hole 1-3. The two side walls of the ejector clip 2-4 slide against the two side surfaces of the ejection guide elongated hole 1-3. The spring 2-3 is disposed between the adjusting nut 2-2 and the ejector clip 2-4. A needle limit bracket 2-5 is fixed to the front end of the guide rod 2-1. A reset top block 2-6 is fixed to the lower end of the ejector clip 2-4. A power-off switch SB22-7 is fixed to the top surface inside the outer shell 1-1. The power-off switch SB22-7 works in conjunction with the reset top block 2-6. The power-off switch SB22-7 is electrically connected to the battery 1-6.

[0028] Furthermore, the outer side of the handles 1-5 is ergonomically designed with anti-slip grip texture, and the springs 2-3 are made of medical-grade stainless steel precision springs with constant elasticity and excellent deformation recovery, ensuring stable needle ejection speed and extremely low puncture pain.

[0029] The energy storage component 3 includes: a reducer 3-1, a drive motor 3-2, a rotating wheel 3-3, an eccentric rod 3-4, and a drug-pushing switch 3-5. The reducer 3-1 is fixed to the bottom inner surface of the outer casing 1-1. The drive motor 3-2 is fixed to the upper end of the reducer 3-1. The output shaft of the drive motor 3-2 is fixedly connected to the input end of the reducer 3-1. The rotating wheel 3-3 is fixed to the output end of the reducer 3-1. An eccentric rod 3-4 is eccentrically fixed to the upper end of the rotating wheel 3-3. The drug-pushing switch 3-5 is fixed to the inner side of the front end of the outer casing 1-1. The reset top block 2-6 is used in conjunction with the eccentric rod 3-4 and the drug-pushing switch 3-5. The drive motor 3-2 and the drug-pushing switch 3-5 are both electrically connected to the battery 1-6. The power-off switch SB22-7 is connected to the drive motor 3-2 through a wire.

[0030] Furthermore, the main switch SB11-7 directly controls the start and stop of the drive motor 3-2. There is no external circuit control module throughout the process. By opening and closing the main switch SB11-7, the motor is controlled to run in one direction, which in turn drives the rotating wheel 3-3 and the eccentric rod 3-4 to rotate, completing the entire process of energy storage, ejection, automatic needle removal, and needle hiding.

[0031] The drug-pushing assembly 4 includes: a second drive motor 4-1, a screw 4-2, and a drug-pushing plate 4-3. The second drive motor 4-1 is fixedly mounted on the rear end of the inner top surface of the outer shell 1-1. One end of the screw 4-2 is fixedly connected to the output shaft of the second drive motor 4-1, and the other end of the screw 4-2 is rotatably connected to the inner side of the rear end of the outer shell 1-1. The drug-pushing plate 4-3 is screwed and fitted onto the screw 4-2. The drug-pushing plate 4-3 slides within the drug-pushing guide hole 1-2, and the two sides of the drug-pushing plate 4-3 are slidably attached to the two sides of the drug-pushing guide hole 1-2. The speed control switch 1-8 and the drug-pushing switch 3-5 are both connected to the second drive motor 4-1 via wires. The second drive motor 4-1 is electrically connected to the battery 1-6.

[0032] Furthermore, this device uses existing injection needle assembly during injection. The injection needle assembly includes: a drug reservoir, a needle, and a Luer connector tubing. The drug reservoir is sealed and connected to the needle through the Luer connector tubing, allowing for flexible adjustment of the injection angle. The Luer connector tubing offers advantages such as easy assembly and disassembly, strong sealing performance, no drug leakage, no gas ingress, and flexible bending.

[0033] Furthermore, the drive motor 1 3-2 and drive motor 2 4-1 are existing technologies, employing a miniature silent unidirectional geared motor, and the battery 1-6 is a rechargeable battery, which is installed in the handle 1-5 in a built-in manner.

[0034] Furthermore, the main switch SB11-7, the power-off switch SB22-7, and the medicine pusher switches 3-5 are all tactile push switches, and the speed control switches 1-8 are rotary switches, all of which are existing technologies and purchased externally.

[0035] Furthermore, the starting angles of the main switch SB11-7 and the power-off switch SB22-7 are as follows: contacts 1 and 3 of the main switch SB11-7 are normally connected, contacts 4 and 6 of the power-off switch SB22-7 are normally connected, contacts 1 and 2 of the main switch SB11-7 are normally disconnected, and contacts 4 and 5 of the power-off switch SB22-7 are normally disconnected.

[0036] When the device is connected to battery 1-6, contacts 1 and 3 of the main switch SB11-7 are energized with contacts 4 and 6 of the power-off switch SB22-7, which in turn drives the drive motor 3-2 to rotate and moves the ejector clip 2-4 to complete energy storage. When the reset top block 2-6 presses the power-off switch SB22-7, contacts 4 and 6 of the power-off switch SB22-7 are disconnected and the drive motor 3-2 stops rotating.

[0037] When the main switch SB11-7 is pressed, contacts 1 and 2 of the main switch SB11-7 are energized with contacts 5 and 4 of the power-off switch SB22-7, which in turn drives the drive motor 3-2 to rotate and release the ejector clip 2-4 to complete the ejection of the needle. At the same time, when the drive motor 3-2 rotates and drives the reset block 2-6 away from the power-off switch SB22-7, contacts 5 and 4 of the power-off switch SB22-7 are disconnected, contacts 4 and 6 of the power-off switch SB22-7 are closed, contacts 1 and 2 of the main switch SB11-7 are closed, and contacts 1 and 3 of the main switch SB11-7 are open. At this time, the drive motor 3-2 is de-energized and stops operating.

[0038] When the main switch SB11-7 is released, contacts 1 and 3 of the main switch SB11-7 are connected, which drives the drive motor 3-2 to rotate. In turn, the reset top block 2-6 drives the ejector clip 2-4 to move again to complete the energy storage and needle removal action, until the reset top block 2-6 presses the power-off switch SB22-7 to stop the drive motor 3-2 from operating and return to the initial state.

[0039] Furthermore, during use, the drug is drawn into the reservoir tube and then fixed by clamping it onto the syringe clamp 1-4. The needle is fixed by clamping it onto the ejector clamp 2-4, and the drug-pushing piston rod of the reservoir tube is connected to the push plate 4-3.

[0040] Furthermore, under normal conditions, the drive motor 3-2 drives the rotating wheel 3-3 and the eccentric rod 3-4 to rotate and press against the reset top block 2-6, pushing the ejector clip 2-4 to slide along the guide rod 2-1 to compress the spring 2-3. Then, the reset top block 2-6 presses against the power-off switch SB22-7 to drive the drive motor 3-2 to cut off the power, thus completing the energy storage.

[0041] During injection, hold the handle 1-5 and place the needle limit frame 2-5 against the skin of the main injection site. Then press the main switch SB11-7 to make the drive motor 3-2 rotate, which in turn drives the rotating wheel 3-3 and the eccentric rod 3-4 to rotate and separate from the reset top block 2-6. Then release the compressed spring 2-3, and push the ejection clip 2-4 to slide forward at high speed along the guide rod 2-1 through the spring 2-3, which drives the needle to pass through the needle limit frame 2-5, completing the needle ejection and insertion. The ejection time is ≤0.2s, achieving painless puncture.

[0042] After the needle is ejected into position, the reset top block 2-6 presses the drug push switch 3-5 to open, causing the drive motor 4-1 to drive the screw 4-2 to rotate, which in turn drives the drug push plate 4-3 to move forward and drive the drug push piston rod to move to complete the injection, realizing automatic drug injection without manual drug push;

[0043] After the medication is pushed out, the main switch SB11-7 is released, and the drive motor 3-2 continues to rotate. Through the rotating wheel 3-3, the eccentric rod 3-4 is driven to rotate, causing the eccentric rod 3-4 to push the reset top block 2-6 to move and rest against the power-off switch SB22-7. The drive motor 3-2 is de-energized, completing the reset and energy storage. The ejector clip 2-4 is then reset and drives the needle to complete the needle removal action.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A painless automatic injector, characterized in that: include: The main body (1), the ejection assembly (2), the energy storage assembly (3) and the propellant delivery assembly (4) are provided. The ejection assembly (2) is fixed at the front end inside the main body (1). The energy storage assembly (3) is fixed inside the main body (1). The energy storage assembly (3) is located below the ejection assembly (2). The propellant delivery assembly (4) is fixed at the rear end inside the main body (1).

2. The painless automatic injector according to claim 1, characterized in that: The main body (1) includes: a shell (1-1), a drug-pushing guide elongated hole (1-2), an ejection guide elongated hole (1-3), a needle tube fixing clamp (1-4), a handle (1-5), a battery (1-6), a main switch SB1 (1-7), and a speed control switch (1-8). The top surface of the shell (1-1) is provided with a drug-pushing guide elongated hole (1-2) and an ejection guide elongated hole (1-3) along its length. The top surface of the shell (1-1) is provided with a needle tube fixing clamp (1-4). The needle tube... The fixing clip (1-4) is set between the push guide elongated hole (1-2) and the ejection guide elongated hole (1-3). The lower end of the outer shell (1-1) is provided with a handle (1-5). The handle (1-5) is provided with a battery (1-6). The handle (1-5) is provided with a main switch SB1 (1-7). The lower end of the outer shell (1-1) is provided with a speed control switch (1-8). The main switch SB1 (1-7) and the speed control switch (1-8) are both electrically connected to the battery (1-6).

3. The painless automatic injector according to claim 2, characterized in that: The ejection assembly (2) includes: a guide rod (2-1), an adjusting nut (2-2), a spring (2-3), an ejection clip (2-4), a needle limit bracket (2-5), a reset top block (2-6), and a power-off switch SB2 (2-7). The guide rod (2-1) is fixed to the front end inside the outer shell (1-1). The front end of the guide rod (2-1) is fixedly protruding from the outer shell (1-1). The rear end surface of the guide rod (2-1) is provided with an external thread. The adjusting nut (2-2) is screwed into the guide rod (2-1) through the external thread. The spring (2-3) is fitted onto the guide rod (2-1). The ejection clip (2-4) is slidably connected to the guide rod (2-1). The ejector clip (2-4) slides within the ejector guide elongated hole (1-3). The two side walls of the ejector clip (2-4) slide against the two side surfaces of the ejector guide elongated hole (1-3). The spring (2-3) is positioned between the adjusting nut (2-2) and the ejector clip (2-4). A needle limit bracket (2-5) is fixed to the front end of the guide rod (2-1). A reset top block (2-6) is fixed to the lower end of the ejector clip (2-4). A power-off switch SB2 (2-7) is fixed to the top surface inside the outer shell (1-1). The power-off switch SB2 (2-7) works in conjunction with the reset top block (2-6). The power-off switch SB2 (2-7) is electrically connected to the battery (1-6).

4. The painless automatic injector according to claim 3, characterized in that: The energy storage component (3) includes: a reducer (3-1), a drive motor (3-2), a rotating wheel (3-3), an eccentric rod (3-4), and a push switch (3-5). The reducer (3-1) is fixed to the bottom surface of the inner shell (1-1). The drive motor (3-2) is fixed to the upper end of the reducer (3-1). The output shaft of the drive motor (3-2) is fixedly connected to the input end of the reducer (3-1). The rotating wheel is fixed to the output end of the reducer (3-1). (3-3), an eccentric rod (3-4) is eccentrically fixed to the upper end of the rotating wheel (3-3), a push switch (3-5) is fixed to the inner side of the front end of the outer shell (1-1), the reset top block (2-6) is used in conjunction with the eccentric rod (3-4) and the push switch (3-5), the drive motor (3-2) and the push switch (3-5) are both electrically connected to the battery (1-6), and the power-off switch SB2 (2-7) is connected to the drive motor (3-2) through a wire.

5. A painless automatic injector according to claim 4, characterized in that: The drug pushing assembly (4) includes: a second drive motor (4-1), a screw (4-2), and a drug pushing plate (4-3). The second drive motor (4-1) is fixed at the rear end of the inner top surface of the outer shell (1-1). One end of the screw (4-2) is fixedly connected to the output shaft of the second drive motor (4-1), and the other end of the screw (4-2) is rotatably connected to the inner side of the rear end of the outer shell (1-1). The drug pushing plate (4-3) is screwed and fitted onto the screw (4-2). The drug pushing plate (4-3) slides in the drug pushing guide hole (1-2). The two sides of the drug pushing plate (4-3) slide against the two sides of the drug pushing guide hole (1-2). The speed control switch (1-8) and the drug pushing switch (3-5) are both connected to the second drive motor (4-1) through wires. The second drive motor (4-1) is electrically connected to the battery (1-6).

Images