Subcutaneous injection pump

Abstract

The utility model provides a hypodermic injection pump, including pump body and apron, be provided with the injection compartment for installing syringe and the element storehouse in injection compartment one side in the pump body, this pump body one end to apron is provided with the containing groove, containing groove is intercommunication with injection compartment and element storehouse respectively, be provided with syringe in injection compartment, be provided with power module in element storehouse, syringe one end is connected with drive arrangement, other end is connected with infusion pipe, the utility model discloses pump body is provided with injection compartment, element storehouse and containing groove, syringe is installed in injection compartment, power module sets up in element storehouse, reduction gearbox sets up in containing groove, power module sets up in syringe one side, reduction gearbox is located power module and syringe below, such design can be convenient for the connection of reduction gearbox and syringe, also can greatly save the installation control of pump body, makes the structure of injection pump more compact, the layout is more reasonable, is favorable to its miniaturization.

Description

Technical Field

[0001] This utility model belongs to the technical field of drug injection equipment, specifically relating to a subcutaneous injection pump. Background Technology

[0002] An infusion pump is a drug delivery device used to precisely control the rate and dosage of medication administration. It mechanically pushes a plunger in a syringe to inject the drug into the patient at a predetermined rate. Some medications require strictly controlled dosages, such as anesthetics, vasopressors, chemotherapy drugs, or other specialized medications. Therefore, in precision medicine, there is a continuous pursuit of improving the injection precision of infusion pumps to enhance medication safety and treatment efficacy.

[0003] Furthermore, because syringe pumps typically contain numerous components such as syringes, motors, and power supply modules, their inefficient layout and space-consuming nature contribute to their large size and bulky structure. Therefore, optimizing the syringe structure to achieve miniaturization and weight reduction has been a constant pursuit for syringe pump manufacturers. Utility Model Content

[0004] The purpose of this invention is to provide a subcutaneous injection pump that optimizes its structure, thereby facilitating miniaturization and weight reduction.

[0005] To achieve the above objectives, this utility model provides a hypodermal injection pump, including a pump body. A cover plate is provided at the open end of the pump body. An injection chamber for mounting a syringe and a component chamber located on one side of the injection chamber are provided within the pump body. A receiving groove is provided at one end of the pump body facing the cover plate, and a connecting hole is provided at the end away from the cover plate corresponding to the position of the injection chamber. The receiving groove communicates with both the injection chamber and the component chamber. A syringe is disposed in the injection chamber, and a power supply module is disposed in the component chamber. One end of the syringe is connected to a drive device, and the other end is connected to an infusion tube through a fixing cap installed in the connecting hole. The drive device includes a motor, a gearbox, and a lead screw. The motor is disposed below the power supply module, and a magnetic encoder is provided on the top of the motor. The gearbox is located in the receiving groove, and its input end is connected to the output end of the motor. The output end of the gearbox is connected to the lead screw, and the lead screw is connected to the syringe to drive the syringe. This technical solution utilizes a magnetic encoder installed at the motor's tail. With each rotation of the motor, the positive and negative poles change dozens of times. Sensors on the circuit board detect these magnetic changes, thus determining the motor shaft rotation angle. This, combined with the reduction ratio and syringe diameter, allows for the calculation of the injection volume. Compared to infrared optocouplers, magnetic encoders are smaller and save space. Furthermore, infrared optocouplers have low resolution and high power consumption, while this solution uses a magnetic encoder, resulting in lower power consumption and reduced costs. Additionally, the pump body incorporates an injection chamber, a component chamber, and a receiving slot. The syringe is housed in the injection chamber, the power supply module in the component chamber, and the reduction gearbox in the receiving slot. In other words, the power supply module is located on one side of the syringe, and the reduction gearbox is positioned below both the power supply module and the syringe. This design facilitates connection between the reduction gearbox and the syringe and significantly saves installation space within the pump body, resulting in a more compact and rationally designed pump, contributing to its miniaturization.

[0006] Preferably, a motor protective frame is provided on the outside of the motor. The top plate of the protective frame is located between the magnetic encoder and the power supply module, and the bottom is pressed against the top surface of the mounting sleeve fixed to the top of the gearbox. The mounting sleeve is coaxially arranged with the input end of the gearbox, and the lower part of the motor is placed inside the mounting sleeve. By providing a motor protective frame, the motor and encoder are effectively protected, extending their service life and improving the stability of the motor during use.

[0007] Preferably, a speaker mounting bracket is provided at the bottom of the component compartment. The speaker mounting bracket is located between the motor protection frame and the inner wall of the component compartment, and a speaker is mounted on it. Several amplification holes are provided on the side wall of the pump body corresponding to the speaker. By providing a speaker, the status of the injection pump can be conveniently indicated, making it convenient for the user.

[0008] Preferably, the gearbox includes a housing and a gear set disposed within the housing. The gear set includes a drive gear fixedly mounted on the motor output shaft and a driven gear fixedly connected to the syringe. The drive gear and the driven gear are connected by a first, second, and third intermediate gear mounted on a mounting plate.

[0009] Preferably, the first, second, and third intermediate gears are all coupled gears consisting of a large and a small gear. The coupled gears serve as both support components for the gears and rotate together with the gears to transmit power, simplifying the structure and improving stability. They also reduce vibration and noise, improving the performance of the injection pump. Furthermore, the gears with this structure are more compact, saving installation space in the pump body.

[0010] Preferably, the bottom end of the lead screw is connected to the center of the driven gear, and the two are coaxially arranged. A push seat is provided on the lead screw, and the two form a threaded pair. Two opposing anti-rotation grooves are formed at the bottom of the push seat, and the anti-rotation grooves are engaged with an anti-rotation strip fixedly provided on the inner wall of the injection chamber. The syringe is driven by a motor to achieve a high-precision and stable injection pump; the cooperation of the anti-rotation grooves and the anti-rotation strip ensures that the push seat moves linearly under the action of the lead screw.

[0011] Preferably, the syringe includes a drug reservoir and a plunger fitted inside the reservoir. A conical groove extending into the plunger is provided at the top of the reservoir where it connects to the needle plug. The plunger is hollow, with a sealing ring between its top outer wall and the inner wall of the reservoir. A conical protrusion matching the groove is provided at the center of the plunger's top surface. A lead screw is fitted inside the plunger, and the bottom end of the plunger presses against the bottom surface of the push seat, causing the push seat to move upward under the action of the lead screw, thus moving the plunger upward along the inner wall of the reservoir. This structural design reduces drug residue, drug waste, medical costs, and the economic burden on patients.

[0012] Preferably, the fixing cap is threaded to the pump body, with a sealing ring between them. A mounting hole is formed at the center of the fixing cap, and the needle plug is located within the mounting hole and inserted into the needle seat of the infusion tubing. A retaining block is provided on the outer side of the needle seat, and a retaining groove adapted to the retaining block is provided on the side wall of the mounting hole. This design ensures the reliability and stability of the connection between the infusion tubing and the syringe, guaranteeing the safety of the infusion.

[0013] Preferably, the magnetic sensor of the magnetic encoder is mounted on the circuit board, which is beneficial for miniaturizing the pump body.

[0014] Preferably, a force sensor is provided between the reducer and the cover plate. By setting the force sensor, the infusion status is monitored to prevent the syringe and infusion tube from becoming blocked, thus ensuring the safety and accuracy of the infusion process.

[0015] Compared with the prior art, the present invention has the following technical effects: 1. This utility model sets up an injection chamber, a component chamber, and a receiving groove in the pump body. The syringe is installed in the injection chamber, the power supply module is set in the component chamber, and the gearbox is set in the receiving groove. That is, the power supply module is set on one side of the syringe, and the gearbox is located below the power supply module and the syringe. This design can not only facilitate the connection between the gearbox and the syringe, but also greatly save the installation control in the pump body, making the structure of the injection pump more compact and the layout more reasonable, which is conducive to its miniaturization. 2. This utility model installs a magnetic encoder at the tail of the motor. With each revolution of the motor, the positive and negative poles change dozens of times. Sensors on the circuit board detect these changes in magnetic force, thereby detecting the rotation angle of the motor shaft. Combined with the reduction ratio and the syringe diameter, the injection volume is calculated. Compared to using an infrared optocoupler sensor, the magnetic encoder is smaller and saves space. Furthermore, infrared optocouplers have low resolution and high power consumption, while this technical solution uses a magnetic encoder with low power consumption, reducing costs. 3. The gear set inside the gearbox of this utility model adopts a large and a small coupling gear. The coupling gear is not only a supporting component of the gear, but also rotates together with the gear to transmit power, which simplifies the structure and improves stability. It can also reduce vibration and noise, improve the performance of the injection pump. Moreover, the gear with this structure is more compact, saves pump body installation space, and the use of a large and a small integrated gear not only facilitates installation, ensures transmission ratio and transmission stability, but also saves installation space. 4. This utility model effectively protects the motor and encoder by setting a motor protection frame, extending their service life and improving the stability of the motor during use; 5. This utility model provides a tapered groove at the connection between the inner cavity of the syringe and the needle plug, and a protrusion at the top of the push rod that matches the groove. During use, this ensures that the inner wall of the top of the syringe and the top of the push rod are fully in contact, and the protrusion is inserted into the groove, which can effectively reduce drug residue and reduce drug waste. 6. This utility model provides a force sensor between the gearbox and the cover plate, which is connected to the controller to monitor the drug injection status, prevent the syringe and infusion tube from becoming blocked, and ensure the safety and accuracy of the infusion process. Attached Figure Description

[0016] The accompanying drawings, which form part of this specification and serve to further illustrate the preferred embodiments of the present invention, and together with the specification, serve to explain the principles of the present invention. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 yes Figure 1 The diagram shows a schematic of the structure for removing the pump body from the syringe pump. Figure 3 yes Figure 1 A schematic cross-sectional view of the injection pump shown; Figure 4 This is a schematic diagram of the drive device for the injection pump of this utility model; Figure 5 This is a schematic diagram of the pump body of the injection pump of this utility model. Detailed Implementation

[0017] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0018] It should be noted that the terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used in this invention, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this invention, they indicate the presence of features, devices, components, and / or combinations thereof.

[0019] In the description of this utility model, it should be understood that the terms "bottom", "top", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Example: As shown in Figure 1, a hypodermal injection pump includes a pump body 1 and a cover plate 2. The pump body 1 is a hollow injection-molded part. The cover plate 2 is snap-fitted, inserted, or hinged to the pump body 1. This invention does not limit the connection method between the cover plate and the pump body. The cover plate 2 is located at the open end of the pump body 1 and is used to block and seal the opening of the pump body 1. A display screen 4 and a button area 5 are provided on the pump body 1. Specifically, the display screen 4 and buttons are located on the panel, such as... Figure 5As shown, a mounting groove 17 for mounting a panel is provided on the pump body 1. A through hole adapted to the display screen 4 is opened in the mounting groove 17 to facilitate the installation and wiring of the display screen 4. The display screen 4 can be used to display information about the syringe 7 and the syringe pump, improving the user's convenience in obtaining information about the syringe 7 and related information, and meeting user needs. The button area 5 is equipped with function keys, an exit key, etc., specifically configured according to user needs. A Type-C port 3 is provided on the top of the pump body 1, enabling charging of the syringe pump, software programming, data reading, etc. Figure 5 As shown, a loudspeaker 19 is provided on the side of the pump body 1, and a loudspeaker is provided inside the pump body 1 at the location corresponding to the loudspeaker 19, so as to inform the user of the status of the injection pump and the syringe 7.

[0022] See Figure 2 and Figure 3 The pump body 1 contains an injection chamber 101 for mounting a syringe 7 and a component chamber 102 located on one side of the injection chamber 101. One end of the pump body 1 faces the cover plate 2, and the other end, away from the cover plate 2, has a connection hole 20 corresponding to the position of the injection chamber 101. A receiving groove 103 communicates with both the injection chamber 101 and the component chamber 102. The syringe 7 is housed within the injection chamber 101, and a power supply module 8 is housed within the component chamber 102. One end of the syringe 7 is connected to a drive device 9, and the other end is connected to an infusion tube 6 via a fixing cap 13 installed in the connection hole 20. In this embodiment, the power supply module 8 includes a power module 801 and a circuit board 802. The power module 801 uses a rechargeable battery, and a plug 14 is provided on the top of the rechargeable battery for easy connection to other components. The positive and negative terminals of the rechargeable battery are connected to the corresponding terminals on the circuit board 802 via wires. The rechargeable battery is arranged along the length of the pump body 1. The circuit board 802 is located in front of the battery and motor 901, that is, on the side closer to the display screen 4. The circuit board 802 is used to connect the display screen 4, motor 901, and other electronic components. The magnetic sensor of the magnetic encoder 902 is set on the circuit board 802, which saves space. The magnetic sensor is connected to the controller of the injection pump, which is mounted on the circuit board 802. As a preferred embodiment, the power supply module 8 also has a button battery 803, which serves as a backup battery to ensure the reliability and stability of the injection pump of this invention. The drive device 9 includes a motor 901, a reduction gearbox 903, and a lead screw 904. The motor 901 is located below the power supply module 8. The magnetic encoder 902 is set on the top of the motor 901 and is connected to the motor shaft of the motor 901 to detect the rotation angle of the motor shaft, ensuring high-precision infusion.

[0023] like Figure 3As shown, the reduction gearbox 903 is located within the receiving slot 103, with its input end connected to the output end of the motor 901. The output end of the reduction gearbox 903 is connected to the lead screw 904. In this embodiment, the injection pump uses a magnetic encoder installed at the tail of the motor 901. As the motor 901 rotates once, its polarity changes dozens of times. The magnetic sensor on the circuit board detects the change in magnetic force, thereby detecting the rotation angle of the motor 901 shaft. This, combined with the reduction ratio and the diameter of the syringe 7, allows for the calculation of the injection volume. Compared to using an infrared optocoupler sensor, the magnetic encoder is smaller and saves space. Furthermore, infrared optocouplers have low resolution and high power consumption, while this magnetic encoder solution has low power consumption and reduces costs. In addition, the pump body 1 is provided with an injection chamber 101, a component chamber 102, and a receiving slot 103. The syringe 7 is installed in the injection chamber 101, the power supply module is installed in the component chamber 102, and the gearbox 903 is installed in the receiving slot 103. That is, the power supply module is installed on one side of the syringe 7, and the gearbox 903 is located below the power supply module and the syringe 7. This design can facilitate the connection between the gearbox 903 and the syringe 7, and can also greatly save the installation components in the pump body 1, making the structure of the injection pump more compact and the layout more reasonable, which is conducive to its miniaturization.

[0024] In this embodiment, see Figure 3 and Figure 4 A motor protection frame 10 is installed on the outside of the motor 901, with its top plate positioned between the magnetic encoder 902 and the power module 801. The bottom plate is pressed against the top surface of a mounting sleeve 11 fixed to the top of the gearbox 903. The mounting sleeve 11 is coaxially aligned with the input end of the gearbox 903, and the lower part of the motor 901 is placed inside the mounting sleeve 11. By installing the motor protection frame 10, the motor 901 and encoder 902 are effectively protected, extending their service life and improving the stability of the motor 901 during use.

[0025] As an optional embodiment of this utility model, a speaker mounting bracket is provided at the bottom of the component compartment 102. The speaker mounting bracket is located between the motor protection frame 10 and the inner wall of the component compartment 102, and a speaker 12 is installed inside it. Several amplification holes 19 are opened on the side wall of the pump body 1 corresponding to the speaker 12. By setting up the speaker, the status of the injection pump can be conveniently indicated.

[0026] In this embodiment, the reduction gearbox 903 includes a housing 931 and a gear set disposed within the housing 931. The gear set includes a driving gear 932 fixedly mounted on the output shaft of the motor 901 and a driven gear 933 fixedly connected to the syringe 7. The driving gear 932 and the driven gear 933 are connected by a first, second, and third intermediate gear mounted on a mounting plate 937. The gears in this embodiment are plastic gears, which are lightweight and low-cost, facilitating the cleaning of the syringe pump and reducing its processing cost. The first intermediate gear 934, the second intermediate gear 935, and the third intermediate gear 936 are all rotatably mounted on the mounting plate 937 via gear housings and are meshed with each other. This design not only meets the transmission ratio requirements but also reduces the installation space of the gearbox. A rectangular slot is formed in the center of the driven gear 933, and the bottom of the lead screw 904 is located within the rectangular slot, thus satisfying the connection requirements between the two. The bottom of the driven gear 933 is rotatably connected to the mounting plate 937 via a shaft.

[0027] In a preferred embodiment of this utility model, the first intermediate gear 934, the second intermediate gear 935, and the third intermediate gear 936 are all coupling gears consisting of a large and a small gear. The coupling gear serves as a support component for the gears and also rotates with them to transmit power, simplifying the structure and improving stability. It also reduces vibration and noise, improving the performance of the injection pump. Furthermore, this gear structure is more compact, saving installation space in the pump body 1. Using a large and a small gear as a single unit not only facilitates installation and ensures the transmission ratio but also saves installation space.

[0028] See Figure 3 and Figure 4 The syringe 7 in this embodiment includes a drug reservoir 701 and a plunger 702. The plunger 702 is a cylindrical structure with a sealed top and an open bottom. The plunger 702 is inserted into the drug reservoir 701, and a sealing ring is provided between its top side and the inner wall of the drug reservoir 701. A lead screw 904 is inserted into the plunger 702. The pusher seat 905 is a T-shaped structure formed by a push plate and a push block fixed on the push plate. A threaded sleeve adapted to the lead screw 904 is fixedly provided at the center of the push block. The threaded sleeve is provided on the lead screw 904, and the two form a threaded pair. The bottom surface of the plunger 702 is pressed against the upper surface of the push plate, so that the motor 901 drives the lead screw 904 and thus pushes the syringe 7 to achieve high-precision and stable injection. As another embodiment of this utility model, a threaded hole is provided at the center of the push block to achieve connection with the lead screw 904.

[0029] In a preferred embodiment of this utility model, in order to prevent dust from entering the injection chamber during use and thus affecting the rotation of the lead screw 904, a dust cover 23 is provided on the outside of the lead screw 904. The dust cover 23 is located inside the push rod 702, and its bottom surface is pressed against the push plate of the push seat 905.

[0030] See Figure 3 and Figure 4 Two opposing anti-rotation grooves 22 are provided at the bottom of the push plate, i.e., the push seat 905. The anti-rotation grooves 22 are connected to the anti-rotation strips 21 fixedly installed on the inner wall of the injection chamber 101. Through the cooperation of the anti-rotation grooves 22 and the anti-rotation strips 21, it can be ensured that the push seat 705 can move linearly under the action of the lead screw 904, thereby driving the push rod 702 and the sleeve 905.

[0031] like Figure 4 As shown, a conical groove 16 extending into the needle plug 23 is provided at the connection between the top of the inner cavity of the medicine storage cylinder 701 and the needle plug 23. A conical protrusion 15 adapted to the groove 16 is provided at the center of the top surface of the push rod 702. Through the cooperation of the groove 16 and the protrusion 15, the top surface of the push rod 702 can be fully fitted with the inner wall of the top of the medicine storage cylinder 701, and the protrusion 15 can be inserted into the needle plug 23, thereby reducing medicine residue and medicine waste.

[0032] In this embodiment, the fixing cap 13 is threadedly connected to the pump body 1, and a sealing ring is provided between them. A mounting hole 24 is provided in the center of the fixing cap 13, and the needle plug 23 is located inside the mounting hole 24 and inserted into the needle seat of the infusion tubing 61. A locking block is provided on the outer side of the needle seat, and a locking groove adapted to the locking block is provided on the side wall of the mounting hole 24. This design ensures the reliability and stability of the connection between the infusion tubing 6 and the syringe 7, guaranteeing the safety of the infusion. In use, the fixing cap 13 is loosened and removed, the syringe 7 is taken out, medication is loaded, and then the syringe 7 is inserted into the injection chamber 101. The syringe 7 is then fixed in place by the fixing cap 13.

[0033] The injection pump in this embodiment also includes a control system, which includes a controller, a display module, a storage module, a signal conversion module, and an alarm module. The input key is electrically connected to the input terminal of the controller via the signal conversion module. The storage module is electrically connected to the controller. The display screen is electrically connected to the controller via the display module. The motor control box is electrically connected to the controller. The alarm module is connected to the output terminal of the controller. In this embodiment, the alarm module uses a speaker 12. A force sensor is installed between the gearbox and the cover plate. The force sensor is connected to the controller and feeds back the collected data to the controller, thereby monitoring the drug injection status, preventing blockage of the syringe and infusion tubing, and ensuring the safety and accuracy of the infusion process. An optocoupler counter is installed at the large gear of the first intermediate gear 934. The optocoupler counter is connected to the controller to detect the number of teeth rotated by the first intermediate gear 934. By comparing this number with the number of rotations of the motor shaft detected by the magnetic encoder, it is determined whether the number of teeth rotated by the first intermediate gear 934 matches the transmission ratio between it and the drive gear 932 installed at the output terminal of the motor. This determines whether the injection pump is malfunctioning. If an malfunction is detected, an alarm is triggered to alert the user, ensuring the safety and reliability of the injection pump of this invention.

[0034] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A subcutaneous injection pump, comprising a pump body, wherein a cover plate is provided at the open end of the pump body, characterized in that, The pump body contains an injection chamber for mounting a syringe and a component chamber located on one side of the injection chamber. A receiving groove is provided at one end of the pump body facing the cover plate, and a connecting hole is provided at the other end away from the cover plate, corresponding to the position of the injection chamber. The receiving groove communicates with both the injection chamber and the component chamber. A syringe is placed inside the injection chamber, and a power supply module is placed inside the component chamber. One end of the syringe is connected to a drive device, and the other end is connected to an infusion tube via a fixing cap installed in the connecting hole. The drive device includes a motor, a gearbox, and a lead screw. The motor is located below the power supply module, and a magnetic encoder is provided on the top of the motor. The gearbox is located inside the receiving groove, and its input end is connected to the output end of the motor. The output end of the gearbox is connected to the lead screw, which is connected to the syringe to drive the syringe.

2. The subcutaneous infusion pump according to claim 1, characterized in that, A motor protection frame is provided on the outside of the motor. The top plate of the protection frame is located between the magnetic encoder and the power supply module, and the bottom is pressed against the top surface of the mounting sleeve fixed on the top of the gearbox. The mounting sleeve is coaxially arranged with the input end of the gearbox, and the lower part of the motor is placed inside the mounting sleeve.

3. The subcutaneous infusion pump according to claim 2, characterized in that, A speaker mounting bracket is provided at the bottom of the component compartment. The speaker mounting bracket is located between the motor protection frame and the inner wall of the component compartment. A speaker is installed inside the bracket. Several amplification holes are provided on the side wall of the pump body corresponding to the speaker.

4. The subcutaneous infusion pump according to claim 1, characterized in that, The gearbox includes a housing and a gear set disposed within the housing. The gear set includes a drive gear fixedly mounted on the motor output shaft and a driven gear fixedly connected to the syringe. The drive gear and the driven gear are connected by a first, second, and third intermediate gear mounted on a mounting plate.

5. The subcutaneous infusion pump according to claim 4, characterized in that, The first, second, and third intermediate gears are all connected gears consisting of a large and a small gear.

6. The subcutaneous infusion pump according to claim 4, characterized in that, The bottom end of the lead screw is connected to the center of the driven gear, and the two are coaxially arranged. A push seat is provided on the lead screw, and the two form a threaded pair. Two opposing anti-rotation grooves are opened at the bottom of the push seat, and the anti-rotation grooves are connected to the anti-rotation strip fixedly arranged on the inner wall of the injection chamber.

7. The subcutaneous infusion pump according to claim 6, characterized in that, The syringe includes a drug reservoir and a plunger fitted inside the drug reservoir. A conical groove extending into the needle plug is provided at the top of the inner cavity of the drug reservoir where it connects with the needle plug. The plunger has a hollow structure, and a sealing ring is provided between its top outer wall and the inner wall of the drug reservoir. A conical protrusion that matches the groove is provided at the center of the top surface of the plunger. A lead screw is fitted inside the plunger, and the bottom end of the plunger presses against the bottom surface of the push seat, so that the push seat moves upward under the action of the lead screw, driving the plunger to move upward along the inner wall of the drug reservoir.

8. The subcutaneous infusion pump according to claim 7, characterized in that, The fixing cap is threaded to the pump body, and a sealing ring is provided between them. An installation hole is provided in the center of the fixing cap. The needle is located in the installation hole and is inserted into the needle seat of the infusion tube. A locking block is provided on the outside of the needle seat, and a slot adapted to the locking block is provided on the side wall of the installation hole.

9. The subcutaneous infusion pump according to claim 1, characterized in that, The magnetic sensor of the magnetic encoder is mounted on the circuit board.

10. The subcutaneous injection pump according to claim 1, characterized in that, A force sensor is installed between the gearbox and the cover plate.

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