A portable injection pump and its control method

Abstract

The present invention relates to a portable injection pump and a control method thereof, comprising a pump body, a push plate, a drive plate, a first drive mechanism, and a second drive mechanism; a syringe is fixed on the pump body, a piston is provided in the syringe, a push rod is provided on the piston, and the push rod is fixedly connected to the push plate; the first drive mechanism is provided in the pump body, and extends with a drive plate with translational propulsion; the second drive mechanism is provided between the drive plate and the push plate, and the second drive mechanism is a controllable structure, which can linearly adjust the distance between the push plate and the drive plate when the first drive mechanism is in a working state, so as to increase or decrease the flow rate. By configuring the first drive mechanism and the second drive mechanism, the present invention realizes the working speed adjustment of the injection pump in the non-stop state, and while meeting basic needs, can further adjust the propulsion amount and working speed within the control time period, meet multiple personalized needs, and is suitable for more complex working needs, thereby improving the adaptability of the injection pump.

Description

Technical Field

[0001] The present invention relates to the technical field of injection pumps, and in particular to a portable injection pump and a control method thereof. Background Art

[0002] In the medical field, when using a syringe to inject or infuse an operating object such as a human body, it is often necessary to monitor and detect the pressure in the injection line to ensure a certain pressure level. The injection pump is an automatic injection device that mainly achieves automatic injection by precisely controlling the feed of the syringe piston handle.

[0003] Structurally, the syringe pump includes an injection frame and a syringe and a screw mechanism arranged on the injection frame. The nut in the screw mechanism is connected to the plunger of the syringe, and the nut is sleeved on the screw in the screw mechanism. The screw is driven to rotate by the stepper motor in the screw mechanism. The nut converts the rotational motion of the screw into linear motion, thereby driving the plunger to move, so as to achieve liquid aspiration and liquid supply of the syringe. The core function of the syringe pump is mainly reflected in the precise control of liquid drug infusion. Specifically, the syringe pump can automatically adjust the infusion rate of the drug to ensure that it is carried out at the speed set by the doctor, thereby achieving accurate drug delivery. At the same time, it can also accurately control the infusion dose of the drug to effectively avoid overdose or underdose of the drug. During the infusion process, the syringe pump can also monitor the infusion status of the drug in real time, including the rate, dose and infusion time, to ensure the safety and reliability of the entire infusion process.

[0004] Existing syringe pumps on the market all use peristaltic extrusion to deliver medications. This method suffers from unstable infusion accuracy, frequent leaks and tube breakage, high product costs, and low production efficiency. While syringe pumps are widely used to optimize the injection process, existing syringe pumps are generally effective at maintaining a constant injection rate.

[0005] Current syringe pumps cannot flexibly adapt to patients' individual needs for the outlet flow rate of the drug solution, and their applicability still needs to be improved. Once the injection speed is set, the injection speed cannot be adjusted without shutting down the machine. Therefore, developing a syringe pump that can accurately respond to patient needs and flexibly adjust the outlet flow rate of the drug solution while maintaining a stable injection speed has become an urgent technical challenge. Summary of the Invention

[0006] In view of this, the object of the present invention is to provide a portable injection pump and a control method thereof, which effectively solves the problem that the existing injection pump can only perform stable and uniform injection and cannot adjust the flow rate in the working state.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a portable injection pump, comprising a pump body, a push plate, a drive plate, a first drive mechanism and a second drive mechanism; a syringe is fixed on the pump body, a piston is provided in the syringe, a push rod is provided on the piston, and the push rod is fixedly connected to the push plate; the first drive mechanism is arranged in the pump body, and a drive plate with translational propulsion is extended; the second drive mechanism is arranged between the drive plate and the push plate, and the second drive mechanism is a controllable structure, which can linearly adjust the distance between the push plate and the drive plate when the first drive mechanism is in the working state to increase or decrease the flow rate.

[0008] Furthermore, the first driving mechanism includes a first driving motor, a first screw and a driving sleeve; the first screw is rotatably arranged in the pump body and is transmission-connected to the first driving motor, the driving sleeve is threadedly connected to the first screw and limited in the pump body, and the driving plate is fixedly connected to the driving sleeve via the connecting seat.

[0009] Furthermore, an embedding block is provided at the bottom of the connecting seat, an embedding groove is provided in the pump body, and the embedding block is adapted to be assembled in the embedding groove.

[0010] Furthermore, the second driving mechanism includes a second driving motor, a second screw rod, an inner sleeve, an outer sleeve and a driving plate, the driving plate is fixed at one end of the inner sleeve, the second screw rod is rotatably set in the inner sleeve, and is transmission-connected to the external second driving motor, the inner sleeve is provided with a plurality of sliding holes, the driving plate is threadedly connected to the second screw rod, and a plurality of limit blocks are extended outward, the limit blocks are adapted to be fitted in the sliding holes and fixed on the inner wall of the outer sleeve; the outer sleeve is adapted to be fitted on the inner sleeve, and the push plate is fixed to the end of the outer sleeve.

[0011] Furthermore, the end of the inner sleeve can be assembled and connected with an end plate, which is fixed on the inner sleeve and closes the inner sleeve. The end plate is provided with a shaft seat, and the second screw is rotatably provided on the shaft seat.

[0012] Furthermore, a positioning groove is provided on the pump body, and a positioning block is provided on the push plate and the drive plate, and the positioning block is adapted to be assembled in the positioning groove.

[0013] Furthermore, an infusion tube is provided at the front end of the syringe, a liquid adding assembly and a filter are provided on the infusion tube, a sealing head is provided at the end of the infusion tube, and the liquid adding assembly includes a base, an anti-reverse valve and a plug; the base is a three-way structure, a liquid inlet is provided on one branch thereof, an anti-reverse valve is provided in the liquid inlet, a liquid adding port is provided at the end of the anti-reverse valve, and a plug is provided at the liquid adding port.

[0014] Furthermore, a mounting groove is provided on the pump body, and a mounting plate is provided on the injection cylinder. The mounting plate is correspondingly mounted in the mounting groove and fixed by bolts.

[0015] Furthermore, the piston is detachably fixedly connected to the push rod, and a plurality of mounting grooves are provided on the pump body.

[0016] A control method for a portable syringe pump, using the portable syringe pump described above, comprises the following steps: selecting a suitable piston, fixing and assembling it on a push rod, taking a corresponding syringe, and fitting it onto the piston, fixing the syringe onto the pump body, and connecting a subsequent infusion tube;

[0017] The first driving mechanism is activated, and the driving plate is used to drive the push plate to move, thereby pushing or pulling the push handle to allow the syringe to extract or inject the injection liquid;

[0018] During the injection process of the syringe, when the injection flow rate needs to be increased, the first driving mechanism is driven in the forward direction, and the second driving mechanism slowly increases the distance between the push plate and the driving plate. During the period when the second driving mechanism is continuously working, the injection flow rate increases, and the flow rate increase amount is adjusted by further adjusting the distance driving amount of the second driving mechanism in the corresponding time period.

[0019] When the injection flow rate needs to be reduced, the first drive mechanism remains unchanged, and the second drive mechanism slowly reduces the distance between the push plate and the drive plate. During the period when the second drive mechanism continues to operate, the injection flow rate is reduced, and the flow rate reduction amount is adjusted by further adjusting the distance driving amount of the second drive mechanism in the corresponding time period.

[0020] During the syringe withdrawal process, when the withdrawal speed needs to be increased, the first drive mechanism is driven in the reverse direction, and the second drive mechanism slowly reduces the distance between the push plate and the drive plate. During the period when the second drive mechanism continues to work, the withdrawal speed increases, and the increase in the withdrawal speed is adjusted by further adjusting the distance driving amount of the second drive mechanism in the corresponding time period.

[0021] When the extraction speed needs to be reduced, the first drive mechanism remains unchanged, and the spacing between the push plate and the drive plate of the second drive mechanism slowly increases. During the period when the second drive mechanism continues to work, the extraction speed is reduced. The reduction in the extraction speed is adjusted by further adjusting the spacing drive amount of the second drive mechanism in the corresponding time period.

[0022] The beneficial effects of the above technical solution are: for the current injection pump structure, the speed can generally only be set before injection or extraction, but there is a lack of speed regulation means during work, which reduces its adaptability; it needs to be shut down before the speed can be adjusted again. For actual work, this method has disadvantages and cannot meet people's needs. Based on this, the present invention provides a syringe pump that can change speed during work, and can increase or decrease the speed without stopping. In order to achieve this purpose, the present invention, based on the technology of the prior art, realizes the translation of the push plate and the drive plate through the first drive mechanism to realize the uniform speed operation of the syringe, and is combined with the second drive mechanism to compensate the first drive mechanism. When the second drive mechanism intervenes, the final propulsion amount of the push plate can be adaptively adjusted.

[0023] The specific first driving mechanism is a linear translation structure, which is driven by a screw rod. The second driving mechanism is arranged on the driving plate, and the motor is arranged on the driving plate. The push plate is connected through the inner sleeve and the outer sleeve. The inner sleeve is driven to move relative to the outer sleeve by means of a driving motor, a screw rod, and a driving disk with a limit block, thereby increasing or decreasing the distance between the push plate and the driving plate. The first driving mechanism drives the driving plate as the driving object, and the push plate is the final propulsion implementation unit. By compensating the length between the two, the push plate propulsion amount is adjusted.

[0024] Therefore, the present invention has a novel structure. By configuring the first drive mechanism and the second drive mechanism, the working speed of the injection pump can be adjusted without stopping. While meeting basic needs, the propulsion amount and working speed within the control time period can be further adjusted to meet more personalized needs. It is suitable for more complex working needs, improves the adaptability of the injection pump, enriches the functions of the injection pump, and provides convenience for people. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the implementation structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the main structure of the present invention;

[0027] Figure 3 Schematic diagram of the internal structure of the present invention;

[0028] Figure 4 Schematic diagram of the implementation structure of the infusion tube;

[0029] Figure 5 It is a schematic diagram of the implementation structure of the liquid adding component;

[0030] Figure 6 Schematic diagram of the implementation structure of the second driving mechanism;

[0031] Figure 7 for Figure 6 Schematic diagram of the right view structure;

[0032] Figure 8 for Figure 6 Schematic diagram of the main structure;

[0033] Figure 9 for Figure 8 Middle AA section;

[0034] Figure 10 This is a schematic diagram of the control part implementation structure of the present invention.

[0035] Figure markings: 1-pump body, 2-control panel, 3-syringe, 4-piston, 5-push rod, 6-second driving mechanism, 61-inner sleeve, 62-outer sleeve, 63-second driving motor, 64-second screw, 65-sliding hole, 66-driving disk, 67-limiting block, 68-end plate, 69-shaft seat, 7-first screw, 8-driving sleeve, 9-first driving motor, 10-connecting seat, 11-driving plate, 12-push plate, 13-round tube, 14-liquid adding assembly, 141-base, 142-check valve, 143-liquid adding port, 144-plug, 15-triangular tube, 16-flow stop clamp, 17-filter, 18-nut, 19-sealing knob. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0037] Example 1. This embodiment aims to provide a portable injection pump, which is mainly used for injection pumps. The current injection pump structure generally achieves uniform injection speed by driving a motor. However, in actual needs, it is necessary to temporarily adjust the injection speed according to the usage scenario and patient conditions, such as increasing or reducing the flow rate. However, the existing technology cannot provide this function for this demand, resulting in its use being relatively limited. Based on this, this embodiment provides a portable injection pump that can achieve both uniform speed and variable speed.

[0038] like Figure 1-5 As shown in the figure, a portable injection pump includes a pump body 1, a push plate 12, a drive plate 11, a first drive mechanism and a second drive mechanism 6; in terms of structure, the pump body 1 is a square structure, and a control panel 2 is provided on the upper part thereof, and the control console has control buttons, such as gear buttons, reset, power on and off, etc., to realize the speed regulation, switch, reset, stop and other functions of the injection pump. The above functions are existing technologies and are not explained in this application.

[0039] The pump body 1 is provided with mounting slots, and the syringe 3 is provided with mounting plates. These mounting plates are snapped into the corresponding mounting slots and secured by bolts. The piston 4 is detachably fixed to the push rod 5. Multiple sets of mounting slots are provided on the pump body 1; this allows the pump body 1 to selectively accommodate syringes 3 of various sizes and models. In this embodiment, the piston 4 employs a double-layer seal to ensure a tight seal during the advancement process, effectively preventing drug leakage. During use, the piston and syringe are interchangeable.

[0040] The front end of the syringe 3 is equipped with an infusion tube, which is equipped with a liquid addition assembly 14 and a filter 17. A plugging head is provided at the end of the infusion tube. The infusion tube specifically includes a circular tube 13 and a triangular tube 15. The circular tube 13 is connected to the syringe 3, and the triangular tube 15 is arranged behind the liquid addition assembly 14. The circular tube 13 and the triangular tube 15 are made of medical-grade materials, which can ensure the pressure resistance and safety of the connection point and pipeline under high pressure. The plugging head includes a nut 18 and a plugging knob 19. The nut is fixed to the triangular tube, and the plugging knob can be threaded onto the nut to achieve plugging of the front end of the infusion tube.

[0041] The liquid adding assembly 14 includes a base 141, an anti-return valve 142, and a plug 144. The base 141 is a three-way structure, with a liquid inlet provided on one of its branches, an anti-return valve 142 provided in the liquid inlet, a liquid adding port 143 provided at the end of the anti-return valve 142, and a plug 144 provided at the liquid adding port 143. The liquid adding port is opened by a one-way valve, which is convenient for adding medicine from the outside to the inside and prevents leakage during the infusion process. A 5μm filter is added to the terminal to better filter crystallization points in the liquid medicine to ensure infusion safety. During the continuous infusion process, this embodiment is provided with a one-way valve liquid adding port device, which can temporarily add the required medicine without affecting the infusion process. During use, PCA (self-controlled liquid dosage, program-set dosage) can be used through control keys and shortcut keys to ensure convenience and safety of use.

[0042] In order to drive the push rod 5, the present embodiment arranges the first driving mechanism in the pump body 1, and extends a driving plate 11 with translational propulsion; the first driving mechanism includes a first driving motor 9, a first screw rod 7 and a driving sleeve 8; during implementation, a first driving cavity can be arranged in the pump body 1, and the first screw rod 7 is rotatably arranged in the first driving cavity and is connected to the first driving motor 9 in transmission. The first driving motor 9 is connected to the first screw rod in transmission through a multi-stage gear box, having a large reduction ratio while meeting the requirements of low noise, high efficiency and wear resistance.

[0043] During implementation, the first drive motor 9 is a DC motor. After the DC motor runs through a precision gear reduction box, its speed slows down and its torque increases. The last gear of the gear box drives the first screw to rotate.

[0044] The first driving cavity is provided with a square hole, the driving sleeve 8 is threadedly connected to the first screw rod 7, and the driving plate 11 is fixedly connected to the driving sleeve 8 via the connecting seat 10. The connecting seat 10 is adapted to be assembled in the square hole, thereby realizing the limiting of the driving sleeve 8.

[0045] As another embodiment, during implementation, an insert is provided at the bottom of the connecting seat, and an insert groove is provided in the pump body. The insert is adapted to be assembled in the insert groove. The insert may be a dovetail structure, thereby realizing the limitation of the drive sleeve 8.

[0046] In this embodiment, the driving sleeve 8 is driven by the rotation of the first screw rod 7. With the help of the connection between the driving sleeve 8 and the connecting seat, and the limit of the connecting seat, the translation function of the driving sleeve 8 is realized. The driving sleeve 8 translates and then drives the driving plate 11 to translate. That is, the first driving mechanism provides a smooth and constant propulsion speed, and the propulsion speed can be adjusted by the buttons on the console before work. However, after the adjustment is completed, the machine needs to be stopped to change the speed.

[0047] In order to further adjust the working speed, this embodiment provides a second driving mechanism 6, and the second driving mechanism 6 is arranged between the driving plate 11 and the push plate 12. The second driving mechanism 6 is a controllable structure, which can linearly adjust the distance between the push plate 12 and the driving plate 11 when the first driving mechanism is in the working state to increase or decrease the flow rate.

[0048] Specifically, the second drive mechanism 6 includes a second drive motor 63, a second screw rod 64, an inner sleeve 61, an outer sleeve 62 and a drive disk 66. Structurally, the outer sleeve 62 and the inner sleeve 61 can be square or circular structures. The drive plate 11 is fixed to one end of the inner sleeve 61. When the first drive mechanism drives the drive sleeve 8 to move, the drive plate 11 can transmit power directly to the inner sleeve 61.

[0049] In order to adjust the distance between the push plate 12 and the drive plate 11, in this embodiment, the second screw rod 64 is rotatably set in the inner sleeve 61 and is connected to the external second drive motor 63. The inner sleeve 61 is provided with a plurality of sliding holes 65. The direction of the sliding holes 65 is arranged along the axial direction of the inner sleeve 61. The drive disk 66 is threadedly connected to the second screw rod 64 and has a plurality of limit blocks 67 extending outward. The limit blocks 67 are arranged radially. In a specific implementation, there can be four limit blocks 67, which are arranged one by one relative to the sliding holes 65. The limit blocks 67 are adapted to be assembled in the sliding holes 65 and extend to the outside of the inner sleeve 61. The outer portion of the limit blocks 67 The end is fixed on the inner wall of the outer sleeve 62; the outer sleeve 62 is adapted to be mounted on the inner sleeve 61, thereby utilizing the structural limitation of the limit block and the sliding hole 65 to limit the rotation state of the drive disk 66, and make the drive disk 66 translate along the direction of the sliding hole 65, while driving the outer sleeve 62 to move relative to the inner sleeve 61 during the translation, and the push plate 12 is fixed to the end of the outer sleeve 62, so that with the help of the overlapping amount of the inner sleeve 61 and the outer sleeve 62, the distance between the push plate 12 and the drive plate 11 is adjusted. During implementation, the second drive motor 63 is a motor with controllable forward and reverse rotation, which is connected to the control module in the pump body 1 through wires.

[0050] During specific implementation, in order to facilitate the assembly of the screw rod and the structure, in this embodiment, an end plate 68 can be assembled and connected to the end of the inner sleeve 61. The end plate 68 is fixed on the inner sleeve 61 and closes the inner sleeve 61. A shaft seat 69 is provided on the end plate, and the second screw rod 64 is rotatably set on the shaft seat 69. At the same time, the limit block can also be an assembleable structure, inserted from the side, and fixed on the drive disk 66, and the connection with the outer sleeve 62 can also be a bolt combination connection.

[0051] In order to ensure the stability of the structure, this embodiment is provided with a positioning groove on the pump body 1, and a positioning block is provided on the push plate 12 and the drive plate 11. The positioning block is adapted to be assembled in the positioning groove to realize the linear translation of the push plate 12 and the drive plate 11, and further combined with the translation propulsion of the first drive mechanism and the translation increase and decrease adjustment of the second drive mechanism 6, finally realizing the propulsion amount adjustment of the push plate 12.

[0052] Specifically, this embodiment further provides a method for controlling a portable syringe pump, comprising the following steps: first, selecting a suitable piston 4, fixing and assembling it on a push rod 5, taking a corresponding syringe 3, and fitting it onto the piston 4, fixing the syringe 3 on a pump body 1, and connecting a subsequent infusion tube;

[0053] Start the first driving mechanism, use the driving plate 11 to drive the push plate 12 to move, and then push or pull the push handle to make the syringe draw or inject the injection liquid;

[0054] During the injection process of the syringe, when the injection flow rate needs to be increased, the first drive mechanism is driven in the forward direction, and the second drive mechanism 6 slowly increases the distance between the push plate 12 and the drive plate 11. During the period when the second drive mechanism 6 continues to work, the injection flow rate increases, and the flow rate increase amount is adjusted by further adjusting the distance driving amount of the second drive mechanism 6 in the corresponding time period.

[0055] When the injection flow rate needs to be reduced, the first drive mechanism remains unchanged, and the second drive mechanism 6 slowly reduces the distance between the push plate 12 and the drive plate 11. During the period when the second drive mechanism 6 continues to operate, the injection flow rate is reduced. The flow rate reduction amount is adjusted by further adjusting the distance driving amount of the second drive mechanism 6 in the corresponding time period.

[0056] During the syringe withdrawal process, when the withdrawal speed needs to be increased, the first drive mechanism is driven in the reverse direction, and the distance between the push plate 12 and the drive plate 11 of the second drive mechanism 6 is slowly reduced. During the period when the second drive mechanism 6 continues to work, the withdrawal speed is increased. The increase in the withdrawal speed is adjusted by further adjusting the distance driving amount of the second drive mechanism 6 in the corresponding time period.

[0057] When the extraction speed needs to be reduced, the first drive mechanism remains unchanged, and the distance between the push plate 12 and the drive plate 11 of the second drive mechanism 6 slowly increases. During the period when the second drive mechanism 6 continues to work, the extraction speed is reduced. The reduction amount of the extraction speed is adjusted by further adjusting the distance driving amount of the second drive mechanism 6 in the corresponding time period.

[0058] The specific features of this embodiment are as follows: Traditional injection pumps can usually only achieve uniform injection, but in actual application, it is often necessary to temporarily adjust the injection speed according to the patient's specific situation and injection needs. The portable injection pump, through the cooperation of the first drive mechanism and the second drive mechanism 6, realizes the function of temporarily and smoothly adjusting the injection speed on the basis of uniform injection, which greatly improves the flexibility and applicability of the injection pump. Through the buttons on the console, the user can easily adjust the injection speed, and this adjustment can be performed in real time during the injection process without stopping the machine. At the same time, the second drive mechanism 6 can linearly adjust the distance between the push plate 12 and the drive plate 11 when the first drive mechanism is working, thereby further fine-tuning the injection speed, making the injection process more controllable and precise. The operation method of the injection pump is simple and clear. The user only needs to press the buttons on the console to adjust the injection speed and control the injection process. There is no need for complicated operating steps and professional skills, which reduces the threshold and difficulty of use.

[0059] Example 2, based on Example 1, further explains its control principle.

[0060] Specific as Figure 10 As shown in , the main product structure of this embodiment is control part + mechanical transmission + drug storage device + infusion pipeline. The control part includes a microcontroller, power monitoring, clock module, memory, alarm prompt circuit and peripheral logic circuit; instructions are sent to the microcontroller through the screen and buttons, and the microcontroller is connected to the power monitoring, clock module, memory, alarm prompt circuit and peripheral logic circuit, so that this embodiment has functions such as low voltage alarm, low drug alarm, blockage alarm, infusion completion alarm, detachment alarm, and pump not running alarm; the above circuits in this embodiment are existing technologies and will not be repeated here.

[0061] The embodiments of the present invention described above do not limit the scope of protection of the present invention. The basic concept of the present invention is to achieve non-stop operating speed adjustment of the syringe pump by configuring the first drive mechanism and the second drive mechanism. While meeting basic requirements, it can further adjust the propulsion volume and operating speed within the control time period. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A portable syringe pump, characterized in that: The pump comprises a pump body, a push plate, a driving plate, a first driving mechanism and a second driving mechanism; an injection cylinder is fixed on the pump body, a piston is provided in the injection cylinder, a push rod is provided on the piston, and the push rod is fixedly connected to the push plate; the first driving mechanism is arranged in the pump body and extends with a driving plate with translational propulsion; the second driving mechanism is arranged between the driving plate and the push plate, and the second driving mechanism is a controllable structure, which can linearly adjust the distance between the push plate and the driving plate when the first driving mechanism is in the working state to increase or decrease the flow rate; the first driving mechanism comprises a first driving motor, a first screw and a driving sleeve; the first screw is rotatably arranged in the pump body and is connected to the first The drive motor is connected in transmission, the drive sleeve is threadedly connected to the first screw rod and limited in the pump body, and the drive plate is fixedly connected to the drive sleeve via a connecting seat; the second drive mechanism includes a second drive motor, a second screw rod, an inner sleeve, an outer sleeve and a drive plate, the drive plate is fixed at one end of the inner sleeve, the second screw rod is rotatably set in the inner sleeve, and is connected in transmission with the external second drive motor, the inner sleeve is provided with a plurality of sliding holes, the drive plate is threadedly connected to the second screw rod, and a plurality of limit blocks are extended outward, the limit blocks are adapted to be fitted in the sliding holes and fixed on the inner wall of the outer sleeve; the outer sleeve is adapted to be fitted on the inner sleeve, and the push plate is fixed to the end of the outer sleeve.

2. The portable injection pump according to claim 1, characterized in that: The bottom of the connecting seat is provided with an embedding block, and an embedding groove is provided in the pump body, and the embedding block is adapted to be assembled in the embedding groove.

3. The portable injection pump according to claim 1, characterized in that: The end of the inner sleeve can be assembled and connected with an end plate, which is fixed on the inner sleeve and closes the inner sleeve. The end plate is provided with a shaft seat, and the second screw rod is rotatably provided on the shaft seat.

4. The portable injection pump according to claim 1, characterized in that: The pump body is provided with a positioning groove, and the push plate and the driving plate are provided with a positioning block, which is adapted to be assembled in the positioning groove.

5. The portable injection pump according to claim 1, characterized in that: The front end of the syringe is provided with an infusion tube, the infusion tube is provided with a liquid adding assembly and a filter, and a sealing head is provided at the end of the infusion tube. The liquid adding assembly includes a base, an anti-reverse valve and a plug; the base is a three-way structure, and a liquid inlet is provided on one branch thereof, an anti-reverse valve is provided in the liquid inlet, a liquid adding port is provided at the end of the anti-reverse valve, and a plug is provided at the liquid adding port.

6. The portable injection pump according to claim 1, characterized in that: The pump body is provided with a mounting groove, and the injection cylinder is provided with a mounting plate. The mounting plate is correspondingly mounted in the mounting groove and fixed by bolts.

7. The portable injection pump according to claim 6, characterized in that: The piston is detachably fixedly connected to the push rod, and a plurality of mounting grooves are arranged on the pump body.

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