Pre-charging type electronic injection device

Abstract

The invention provides a pre-filling type electronic injection device which comprises an outer sleeve and a pen cap which are detachably connected, and further comprises an electronic injection module which is arranged in the outer sleeve and used for achieving the injection process of liquid medicine. The grating feedback module is arranged in the outer sleeve, and the grating feedback module is fixedly connected with the electron injection module; the control module is in communication connection with the electronic injection module and the grating feedback module and used for receiving information of the grating feedback module and controlling the electronic injection module. A motor is used as a power unit, the infusion accuracy and stability are improved, user input is recognized through intelligent control, the misoperation rate of a user is reduced, and the user experience is improved. The real-time rotating speed and position are obtained through grating feedback, the infusion precision is improved, a mechanical structure is replaced with electronic control, the problem of errors generated after repeated use is solved, infusion requirements of drugs with different viscosities can be met, and the intelligent degree and reliability of the device are improved to a great extent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical injection administration, and particularly relates to a pre-filled electronic injection device. Background Art

[0002] In the field of modern medical injection administration, mechanical pre-filled injection pens are widely used due to their portability and ease of operation. Such devices usually consist of a medical plastic pen body, a pre-filled cartridge, mechanical transmission components (such as lead screws, gear sets or spring push rods) and a needle assembly. The pen body is designed based on ergonomics, and has anti-slip patterns on the surface to enhance the holding stability; the pre-filled cartridge is made of glass or polymer materials, with a fixed dose of drug pre-filled inside, and is connected to the needle assembly and the mechanical transmission mechanism at both ends respectively; the user triggers the mechanical transmission by rotating a knob or pressing a push rod to drive the piston of the cartridge to complete the drug injection, and the needle assembly is usually equipped with a protective cover to ensure the use safety.

[0003] However, the existing mechanical pre-filled injection devices have significant defects: the mechanical transmission components are prone to generate dead strokes or transmission lags due to machining tolerances, assembly clearances and long-term wear, resulting in the accumulation of deviations between the injection stroke and the theoretical value. Especially after multiple uses, the mechanical components are more severely worn, and the injection error is further enlarged, making it difficult to meet the high-precision drug administration requirements; there is a lack of real-time monitoring and feedback during the injection process. When the needle is blocked, the viscosity of the liquid medicine is abnormal or the resistance at the injection site of the patient suddenly changes, the operator cannot know the abnormal state, which easily leads to the risk of insufficient injection dose or tissue damage; the mechanical transmission mechanism adopts a fixed injection force output mode and cannot dynamically adjust the injection pressure and speed according to the viscosity of the liquid medicine; the mechanical components are prone to fatigue deformation or wear after frequent use, resulting in a decrease in transmission efficiency and uneven injection resistance, seriously affecting the service life of the device and the consistency of drug administration.

[0004] Therefore, the existing technology still needs to be further developed. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a pre-filled electronic injection device to solve the problems existing in the prior art.

[0006] To achieve the above technical purpose, according to the first aspect of the present invention, the present invention provides a pre-filled electronic injection device, including an outer sleeve and a pen cap, the outer sleeve and the pen cap are detachably connected, and the device further includes: An electronic injection module, arranged inside the outer sleeve, for realizing the injection process of the liquid medicine; A grating feedback module, arranged inside the outer sleeve, the grating feedback module is fixedly connected to the electronic injection module; A control module, communicatively connected to both the electronic injection module and the grating feedback module, for receiving the information of the grating feedback module.

[0007] Specifically, the electronic injection module includes a motor, a lead screw, and a push rod. One end of the output shaft of the motor is connected to one end of the lead screw. When the motor rotates, the output shaft of the motor drives the lead screw to perform a rotational motion. The other end of the lead screw is threadedly connected to one end of the push rod. When the lead screw performs a rotational motion, it drives the push rod to perform a linear motion.

[0008] Specifically, the electronic injection module further includes an upper motor fixing bracket and a lower motor fixing bracket. Both the upper motor fixing bracket and the lower motor fixing bracket are arranged outside the motor. The upper motor fixing bracket is located at the end of the motor away from the lead screw, and the lower motor fixing bracket is located at the end of the motor close to the lead screw.

[0009] Specifically, the grating feedback module includes a grating sensor and a grating gear. The grating gear is arranged at the end of the motor away from the lead screw. When the motor rotates, it drives the grating gear to rotate. The grating sensor is arranged at one end of the motor and is communicatively connected to the grating gear through an infrared signal.

[0010] Specifically, the device further includes a power supply module. The power supply module is arranged at the end of the motor away from the lead screw. The power supply module includes a battery and a battery holder. The battery is arranged inside the battery holder. The power supply module further includes a flexible board. The flexible board includes a positive electrode and a negative electrode. The positive electrode and the negative electrode of the flexible board are respectively connected to the positive electrode and the negative electrode of the battery.

[0011] Specifically, the device further includes a dose input module, which is arranged at one end of the power supply module. The dose input module is fixedly connected to the power supply module. The dose input module is used to set the dose of the liquid medicine to be injected.

[0012] Specifically, the dose input module includes a dose setting knob and a potentiometer. The dose setting knob is fixedly connected to the potentiometer. When the dose setting knob is rotated, it drives the potentiometer to perform a synchronous rotational motion.

[0013] Specifically, the device further includes an injection button, which is arranged on the surface of the outer casing and is used to receive the key operation of the user. The injection button is communicatively connected to the control module. When the control module receives the key operation of the user, it converts the key operation into a change in the level signal.

[0014] Specifically, the device further includes a medicine bottle and a cartridge holder, both of which are disposed inside the pen cap. One end of the medicine bottle is connected to the other end of the push rod, and the other end of the medicine bottle is connected to the cartridge holder. The medicine bottle is used to load injection liquid medicine, and the cartridge holder is used to fix and support the medicine bottle.

[0015] Specifically, a piston is arranged in the medicine bottle, and the piston is fixedly connected to the push rod. When the push rod moves in a straight line, the piston is pushed forward to perform the infusion of the liquid medicine.

[0016] Advantageous effects: The present invention provides a pre-filled electronic injection device, including an electronic injection module that converts the rotational motion of a reduction motor into the linear motion of a push rod through a lead screw to push a piston to deliver liquid medicine, ensuring the smoothness of the injection process; a grating feedback module that sets a grating sensor and a grating gear, and the rotation of the motor drives the grating gear to rotate. The control module obtains the real-time rotational speed and rotational position of the motor by collecting the level change of the grating, greatly improving the injection accuracy. Compared with the prior art, the present invention uses a motor as the power unit, improving the accuracy and stability of the infusion, using intelligent control to identify user input, reducing the user's misoperation rate, using grating feedback to obtain the real-time rotational speed and position, further improving the infusion accuracy, replacing the mechanical structure with electronic control, solving the error problem generated after multiple uses. At the same time, the intelligent control system can adapt to the infusion requirements of drugs with different viscosities, greatly improving the intelligence, usability and reliability of the present invention. Description of the drawings

[0017] Figure 1 is a schematic diagram of the internal structure of the pre-filled electronic injection device provided in the specific embodiment of the present invention; Figure 2 is a schematic diagram of the overall assembly of the pre-filled electronic injection device provided in the specific embodiment of the present invention; Figure 3 is a schematic diagram of the battery installation position provided in the specific embodiment of the present invention; Figure 4 is a schematic diagram of the battery power supply circuit provided in the specific embodiment of the present invention; Figure 5 is a schematic diagram of the overall assembly of the internal components of the pre-filled electronic injection device provided in the specific embodiment of the present invention; Figure 6 is a schematic diagram of the structure of the dose setting knob provided in the specific embodiment of the present invention; Figure 7 is a schematic diagram of the circuit structure of the dose setting knob provided in the specific embodiment of the present invention Figure 8It is a schematic diagram of the components of the electronic injection module provided in the specific embodiment of the present invention; Figure 9 It is a schematic diagram of the components of the grating feedback module provided in the specific embodiment of the present invention; Figure 10 It is a schematic diagram of the grating feedback principle provided in the specific embodiment of the present invention; Figure 11 It is a schematic diagram of the position of the injection button provided in the specific embodiment of the present invention; Figure 12 It is a schematic diagram of the structure of the injection button circuit provided in the specific embodiment of the present invention; Among them, the reference numerals of the above-mentioned drawings are as follows: 1. Outer sleeve; 2. Pen cap; 3. Motor; 4. Lead screw; 5. Pusher; 6. Upper motor fixing frame; 7. Lower motor fixing frame; 8. Grating sensor; 9. Grating gear; 10. Battery; 11. Battery holder; 12. Flexible board; 13. Dose setting knob; 14. Potentiometer; 15. Injection button; 16. Medicine bottle; 17. Cartridge holder. Specific embodiment

[0018] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Based on the embodiments in this application, other similar embodiments obtained by those of ordinary skill in the art without making creative efforts shall all fall within the scope of protection of this application. In addition, the directional terms mentioned in the following embodiments, such as "upper", "lower", "left", "right", etc. are only references to the directions of the drawings. Therefore, the directional terms used are for illustration rather than limitation of the present invention.

[0019] The present invention will be further described below in conjunction with the drawings and preferred embodiments.

[0020] Please refer to Figure 1 , this embodiment provides a pre-filled electronic injection device, including an outer sleeve 1 and a pen cap 2, the outer sleeve 1 and the pen cap 2 are detachably connected, and the device further includes an electronic injection module, a grating feedback module and a control module; See Figure 1 , in the pre-filled electronic injection device of this embodiment, the electronic injection module is arranged inside the outer sleeve 1 and is used to realize the injection process of the liquid medicine through electronic control; the electronic injection module includes a motor 3, a lead screw 4 and a pusher 5, the output shaft of the motor 3 is connected to one end of the lead screw 4, when the motor 3 rotates, the output shaft of the motor 3 drives the lead screw 4 to rotate, and the other end of the lead screw 4 and one end of the pusher 5 are connected by threads, when the lead screw 4 rotates, it drives the pusher 5 to move linearly.

[0021] Further, seeFigure 5 , Figure 5 is a schematic diagram after all internal components are assembled. Through Figure 5 the movement direction of the push rod 5 and the internal structure of other working modules can be seen. In this embodiment, the infusion function of the pre-filled electronic injection device is realized by the electronic injection module, that is, the rotational motion of the reduction motor 3 is converted into the linear motion of the push rod 5 through the lead screw 4, so as to push the piston forward to push the liquid medicine, as Figure 8 shown. When the reduction motor 3 rotates, since the motor 3 is fixed in the injection pen, the lead screw 4 will be driven to rotate during the rotation of the motor 3 gear. During the rotation of the lead screw 4, since the lead screw 4 and the push rod 5 are connected by a thread, the rotation is converted into a linear motion through the thread structure.

[0022] See Figure 1 , the electronic injection module further includes an upper motor fixing bracket 6 and a lower motor fixing bracket 7. Both the upper motor fixing bracket 6 and the lower motor fixing bracket 7 are arranged outside the motor 3. The upper motor fixing bracket 6 is located at one end of the motor 3 away from the lead screw 4, and the lower motor fixing bracket 7 is located at one end of the motor 3 close to the lead screw 4. The design of the upper motor fixing bracket 6 and the lower motor fixing bracket 7 can effectively fix the motor 3, prevent the motor 3 from displacing during operation, and ensure the stable operation of the motor 3.

[0023] Preferably, the upper motor fixing bracket 6 and the lower motor fixing bracket 7 can be made of high-strength engineering plastics, which have good wear resistance and stability, can effectively fix the motor 3, and prevent the motor 3 from displacing during operation.

[0024] See Figure 1 and Figure 9 , in the pre-filled electronic injection device of this embodiment, the grating feedback module is arranged inside the outer sleeve 1, and the grating feedback module is fixedly connected to the electronic injection module; wherein, the grating feedback module includes a grating sensor 8 and a grating gear 9. The grating gear 9 is arranged at one end of the motor 3 away from the lead screw 4. When the motor 3 rotates, it drives the grating gear 9 to rotate. The grating sensor 8 is arranged at one end of the motor 3 away from the lead screw 4 and is communicatively connected to the grating gear 9 through an infrared signal. The grating sensor 8 can detect the rotation of the grating gear 9, so as to obtain the rotation information of the motor 3 and provide feedback data for the control module.

[0025] Furthermore, see Figure 9, since the grating gear 9 is installed at the tail end of the motor 3, the motor 3 will drive the gear to rotate during the rotation process. An infrared transmitting end and an infrared receiving end are provided in the grating sensor 8. The infrared transmitting end is used to emit infrared signals. When the infrared receiving end receives the infrared signal, the level at both ends of the infrared receiving end will be pulled low. When the infrared receiving end does not receive the infrared signal, the level at both ends of the infrared receiving end will be pulled high. During the rotation of the motor 3, due to the pattern of the grating gear 9 at the tail end as shown in Figure 10 on the left, the grating will be intermittently in a conducting and off state. The control system obtains the real-time rotational speed and rotational position of the motor 3 by collecting the level change of the grating. Figure 10 The right side shows the working principle of the grating sensor 8, which is as follows: The infrared transmitting end ① is used to emit infrared signals, and the infrared receiving end ② is used to receive infrared signals. When the infrared signal is received, the level at both ends of the infrared receiving end will be pulled low; when the infrared signal is not received, the level at both ends of the infrared receiving end will be pulled high. Due to the intermittent occlusion of the grating gear 9, the infrared receiving end will continuously be in a conducting and off state. The control system obtains the real-time rotational speed and rotational position of the motor 3 by collecting the level change at both ends of the infrared receiving end. Among them, the diode end represents the infrared transmitting end for emitting infrared signals, and the triode end represents the infrared receiving end. Its base is connected to the transmitting end, and the collector and emitter are respectively connected to the power supply and the ground. Resistors ③ and ④ are used for current limiting and voltage division to ensure the normal operation of the circuit. Therefore, when the motor 3 rotates, the grating gear 9 will intermittently occlude the infrared signal, resulting in a periodic change in the level at both ends of the infrared receiving end. The control system can accurately judge the real-time rotational speed and rotational position of the motor 3 by collecting these level changes, thereby realizing precise control of the dose input.

[0026] Preferably, the grating sensor 8 can adopt a high-precision infrared sensor, which can accurately detect the rotation of the grating gear 9 and provide accurate feedback data for the control module.

[0027] Furthermore, in the pre-filled electronic injection device of this embodiment, a control module is further included. The control module is communicatively connected to both the electronic injection module and the grating feedback module, and is used to receive the information of the grating feedback module and control the electronic injection module. The control module is designed with a microprocessor and has high-speed processing capabilities. It can process the data provided by the grating feedback module in real time and accurately control the operation of the motor 3. The control module can calculate the displacement of the push rod 5 based on the rotation information of the motor 3 provided by the grating feedback module, thereby accurately controlling the injection dose.

[0028] See Figure 1 and Figure 3, in the pre-filled electronic injection device of this embodiment, the device further includes a power supply module. The power supply module is arranged at one end of the motor 3 away from the lead screw 4. The power supply module includes a battery 10 and a battery holder 11. The battery 10 is arranged inside the battery holder 11. The power supply module further includes a flexible board 12. The flexible board 12 includes a positive electrode and a negative electrode. The positive and negative electrodes of the flexible board 12 are respectively connected to the positive and negative electrodes of the battery 10. The design of the flexible board 12 makes the circuit connection more flexible and adapts to the limitations of the internal space of the device. The battery 10 uses a rechargeable lithium battery 10, which has a long service life and a stable output voltage, and can provide a stable power supply for the device.

[0029] Further, referring to Figure 3 and Figure 4 , the power supply module includes two batteries 10 connected in series. The two batteries 10 connected in series are fixed in the battery holder 11 through a mechanical structure to provide power for the motor 3, and are directly connected to the motor 3 through wires to drive its operation. There are two pole pieces, a positive pole and a negative pole, in the flexible board 12. The voltage is conducted to the circuit board through the pole pieces, and through the voltage stabilization circuit and voltage division structure inside the circuit board, the voltage is transmitted to the motor 3 and the internal control circuit. The specific working process is as follows: The voltage output from the series-connected batteries 10 is input into the IC chip through the DC_IN interface. The IC chip (integrated chip) has multiple pins (such as the marked 1, 2, 3, 4), which are responsible for functions such as voltage stabilization, voltage division or signal processing to ensure the stability and accuracy of the output voltage. The voltage processed by the IC chip is output through the DC_OUT interface. This power supply module provides power support for the entire system through two series-connected batteries 10. The voltage generated by the batteries 10 is conducted to the circuit board through the pole pieces on the flexible board 12, and after voltage stabilization and voltage division processing on the circuit board, it is finally supplied to the motor 3 and the internal control circuit respectively.

[0030] Referring to Figure 1 and Figure 2 , in the pre-filled electronic injection device of this embodiment, the device further includes a dose input module, which is arranged at one end of the power supply module. The dose input module is fixedly connected to the power supply module. The dose input module is used to set the dose of the liquid medicine to be injected. The dose input module includes a dose setting knob 13 and a potentiometer 14. The dose setting knob 13 is fixedly connected to the potentiometer 14. When the dose setting knob 13 is rotated, it will drive the potentiometer 14 to rotate synchronously. By rotating the dose setting knob 13, the user can conveniently adjust the injection dose. The potentiometer 14 converts the rotation angle into an electrical signal and transmits it to the control module. Among them, the dose setting knob 13 adopts an ergonomic design, with a comfortable grip and a moderate rotation damping, enabling the user to accurately set the dose.

[0031] Referring to Figure 6 and Figure 7, the dose input function of the pre-filled electronic injection pen is realized by the user rotating the knob, which drives the potentiometer 14 below the dose setting knob 13. As Figure 7 shown, in the circuit, the rotation of the potentiometer AD changes the resistance corresponding to the potentiometer AD. R1 represents a fixed resistor, which is used as part of the voltage dividing circuit. RS is the sliding end point on the potentiometer 14. As the potentiometer 14 rotates, this end point moves on the resistor, thereby changing the output voltage. DC is a DC power supply, which provides a stable DC voltage for the entire circuit. Due to the voltage division of the resistor, different voltages are input to the control module, and finally the dose input by the user is judged by judging different voltages. That is, the potentiometer 14 changes its effective resistance value as the dose setting knob 13 rotates, and then changes the voltage at the sliding end point through the principle of resistor voltage division. The control module detects this voltage change and finally judges the dose input by the user, which makes the dose adjustment more intuitive and accurate, and improves the convenience and accuracy of the electronic injection device of the present invention.

[0032] See Figure 11 , in the pre-filled electronic injection device of this embodiment, the device further includes an injection button 15, which is arranged on the surface of the outer sleeve 1 and is used to receive the button operation of the user. The injection button 15 is communicatively connected to the control module. When the control module receives the button operation of the user, it converts the button operation into a change in the level signal. After the user presses the injection button 15, the control module receives the signal and starts the motor 3 to start the injection process. An indicator light is arranged above the injection button 15. When the user is ready to infuse, first, the infusion dose needs to be adjusted. The adjustment method is through the dose setting knob 13. There are four gears on the dose setting knob 13. During the rotation, if there is a gear change, the indicator light will flash once; after adjusting the gear, the user presses the injection button 15 to execute the infusion operation, and at this time the indicator light will flash frequently, thereby indicating that it is in the infusion state.

[0033] Furthermore, see Figure 11 and Figure 12 , in the pre-filled electronic injection device of this embodiment, the injection function, that is, the button input function, converts the physical operation of the user pressing the button into a change in the level signal through circuit conversion, and the control system collects the signal change to make corresponding operations. The specific working process is as follows: As Figure 12As shown, when the user presses the motor 3 for the first time, the EN port will be in a high-level state, and the KEY port will be in a low-level state due to the conduction of the MOS transistor. At this time, the control module continuously outputs a high level at the PWR port, so that the EN port can still be in a high-level state after the user releases the button. After that, when the user presses the button, the control system detects whether the user presses the button by detecting the level change of the KEY port. If the KEY port is at a low level, it means the button is pressed; if the KEY port is at a high level, it means the button is not pressed.

[0034] See Figure 1 and Figure 2 In the pre-filled electronic injection device of this embodiment, the device further includes a medicine bottle 16 and a cartridge holder 17. The medicine bottle 16 and the cartridge holder 17 are both arranged inside the pen cap 2. One end of the medicine bottle 16 is connected to the other end of the push rod 5, and the other end of the medicine bottle 16 is connected to the cartridge holder 17. The medicine bottle 16 is used to load the injection liquid, and the cartridge holder 17 is used to fix and support the medicine bottle 16. Wherein, a piston is arranged in the medicine bottle 16, and the piston is fixedly connected to the push rod 5. When the push rod 5 makes a linear motion, it pushes the piston forward to perform the infusion of the liquid medicine.

[0035] Preferably, the medicine bottle 16 is made of a transparent material, which is convenient for the user to observe the remaining amount and state of the liquid medicine. The cartridge holder 17 is made of a high-strength material, which can stably support the medicine bottle 16 and prevent the medicine bottle 16 from shifting during use. The piston is made of a medical-grade silicone material, which has good sealing performance and biocompatibility, and can ensure the aseptic state of the liquid medicine and the safety of injection.

[0036] During use, the user first sets the dose of the liquid medicine to be injected through the dose setting knob 13, and then presses the injection button 15. After the control module receives the signal, it controls the motor 3 to start. The motor 3 drives the lead screw 4 to rotate, and the lead screw 4 drives the push rod 5 to perform a linear motion through a threaded connection. The push rod 5 pushes the piston forward in the medicine bottle 16 to push the liquid medicine out of the medicine bottle 16 to complete the injection process. During the injection process, the grating feedback module real-time monitors the rotation of the motor 3 and feeds the information back to the control module. The control module adjusts the operation of the motor 3 according to the feedback information to ensure the accuracy of the injection dose.

[0037] It can be understood that the structure of the pre-filled electronic injection device in this embodiment is compact and the operation is simple. Precise injection is achieved through electronic control, which improves the accuracy and safety of injection. The design of the grating feedback module enables the device to real-time monitor the injection process and ensure the accuracy of the injection dose. The design of the dose input module and the injection button enables the user to conveniently set the dose and perform the injection operation. The design of the medicine bottle and the cartridge holder makes it more convenient to replace the liquid medicine and improves the use efficiency of the device.

[0038] It should be noted that the pre-filled electronic injection device in this embodiment adopts a modular design. The connection between each module is tight, and they work together to achieve the automation and precision of liquid medicine injection. The application of the electronic control system makes the injection process safer and more reliable. The design of the grating feedback module improves the accuracy of the injection dose. The design of the dose input module and the injection button makes the operation more convenient and intuitive. It is suitable for patients who need long-term and regular drug injections, and can effectively improve the convenience and safety of injection.

[0039] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or devices.

[0040] The technical features described above can be combined arbitrarily. Although all possible combinations of these technical features have not been described, any combination of these technical features should be considered to be covered by this specification as long as such a combination does not exist in contradiction.

[0041] The specific implementation manners of the present invention described above do not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A prefilled electronic injection device, comprising a casing (1) and a pen cap (2), wherein the casing (1) and the pen cap (2) are detachably connected, and characterized in that: The device also includes: An electronic injection module, arranged inside the outer jacket (1) and used to implement the injection process of the drug solution; A grating feedback module is arranged inside the outer casing (1), and the grating feedback module is fixedly connected to the electronic injection module; The control module is communicatively connected with the electronic injection module and the grating feedback module, and is used for receiving information from the grating feedback module.

2. The prefilled electronic injection device according to claim 1, characterized in that: The electronic injection module comprises a motor (3), a screw rod (4) and a push rod (5); the output shaft of the motor (3) is connected to one end of the screw rod (4); when the motor (3) rotates, the output shaft of the motor (3) drives the screw rod (4) to rotate; The other end of the screw rod (4) and one end of the push rod (5) are connected via a thread, and when the screw rod (4) performs a rotational motion, it drives the push rod (5) to perform a linear motion.

3. The prefilled electronic injection device according to claim 2, characterized in that: The electronic injection module further comprises a motor fixing upper frame (6) and a motor fixing lower frame (7), wherein the motor fixing upper frame (6) and the motor fixing lower frame (7) are both arranged outside the motor (3), the motor fixing upper frame (6) is located at an end of the motor (3) away from the screw rod (4), and the motor fixing lower frame (7) is located at an end of the motor (3) close to the screw rod (4).

4. The prefilled electronic injection device according to claim 3, characterized in that: The grating feedback module comprises a grating sensor (8) and a grating gear (9), wherein the grating gear (9) is arranged at an end of the motor (3) away from the lead screw 4, and when the motor (3) rotates, the grating gear (9) is driven to rotate; The grating sensor (8) is arranged at one end of the motor (3) and is connected to the grating gear (9) via infrared signal communication.

5. The prefilled electronic injection device according to claim 2, characterized in that: The device further comprises a power supply module, the power supply module being arranged at an end of the motor (3) away from the screw rod (4), the power supply module comprising a battery (10) and a battery holder (11), the battery (10) being arranged inside the battery holder (11); The power supply module further comprises a flexible board (12), the flexible board (12) comprising a positive electrode and a negative electrode, the positive electrode and the negative electrode of the flexible board (12) being connected to the positive electrode and the negative electrode of the battery (10) respectively.

6. The prefilled electronic injection device according to claim 5, characterized in that: The device further comprises a dosage input module, which is arranged at one end of the power supply module, the dosage input module is fixedly connected to the power supply module, and the dosage input module is used to set the dosage of the liquid medicine to be injected.

7. The prefilled electronic injection device according to claim 6, characterized in that: The dose input module comprises a dose setting knob (13) and a potentiometer (14); the dose setting knob (13) is fixedly connected to the potentiometer (14); when the dose setting knob (13) is rotated, the potentiometer (14) is driven to perform synchronous rotational movement.

8. The prefilled electronic injection device according to claim 1, characterized in that: The device further comprises an injection button (15), which is arranged on the surface of the jacket (1) and is used to receive a button operation by a user; The injection button (15) is in communication connection with the control module, and when the control module receives a button operation from a user, the button operation is converted into a change in a level signal.

9. The prefilled electronic injection device according to claim 2, characterized in that: The device further comprises a medicine bottle (16) and a refill rack (17), wherein the medicine bottle (16) and the refill rack (17) are both arranged inside the pen cap (2), one end of the medicine bottle (16) is connected to the other end of the push rod (5), and the other end of the medicine bottle (16) is connected to the refill rack (17), the medicine bottle (16) is used to load injection liquid, and the refill rack (17) is used to fix and support the medicine bottle (16).

10. The prefilled electronic injection device according to claim 9, characterized in that: The medicine bottle (16) is provided with a piston, and the piston is fixedly connected to the push rod (5). When the push rod (5) moves linearly, the piston is pushed forward to perform infusion of the medicine solution.

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