Portable injection pump and control method thereof

Abstract

The invention relates to a portable injection pump and a control method thereof. The portable injection pump comprises a pump body, a push plate, a driving plate, a first driving mechanism and a second driving mechanism, a syringe is fixed on the pump body, a piston is arranged in the syringe, a push rod is arranged on the piston, and the push rod is fixedly connected with the push plate; the first driving mechanism is arranged in the pump body and extends to form a driving plate with a translation propelling function; the second driving mechanism is arranged between the driving plate and the push plate, the second driving mechanism is of a controllable structure, and the distance between the push plate and the driving plate can be linearly adjusted in the working state of the first driving mechanism so that the flow speed can be increased or decreased. The first driving mechanism and the second driving mechanism are arranged, so that the working speed of the injection pump in a non-stop state is adjusted, the propelling amount and the working speed in a control time period can be further adjusted while basic requirements are met, the multi-individualized requirements are met, the injection pump is suitable for more complex working requirements, and the working efficiency is improved. And the application range of the injection pump is widened.

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 accurately controlling the feed of the syringe piston handle.

[0003] Structurally, the injection pump includes an injection frame and a syringe and a screw mechanism arranged on the injection frame, wherein the nut in the screw mechanism is connected to the plunger of the syringe, 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, and the nut converts the rotational motion of the screw into linear motion, thereby driving the plunger to move, so as to realize the suction and supply of liquid in the syringe. The core function of the injection pump is mainly reflected in the precise control of liquid drug infusion. Specifically, the injection 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 realizing accurate delivery of the drug. At the same time, it can also accurately control the infusion dose of the drug to effectively avoid the occurrence of overdose or underdose of the drug. During the infusion process, the injection 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] The existing syringe pumps on the market all use peristaltic extrusion to complete the infusion. This method has unstable infusion accuracy, frequent leakage and tube breakage, high product cost and low production efficiency. Although current technology has widely used syringe pumps to optimize the injection process, the existing syringe pumps have a better use effect in maintaining a constant injection speed.

[0005] The current syringe pump cannot flexibly adapt to the patient's personalized needs for the outlet flow rate of the drug solution, and its applicability still needs to be improved. After the injection speed is set, the injection speed can be adjusted without stopping 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 a technical challenge that needs to be solved urgently. Summary of the invention

[0006] In view of this, an 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 arranged in the syringe, a push rod is arranged 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 a working state, so as 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 a 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 arranged in the inner sleeve, and is drivingly 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 outwardly, 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, the pump body is provided with a mounting groove, and the injection cylinder is provided with a mounting plate, and 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 arranged on the pump body.

[0016] A control method for a portable syringe pump, using the above-mentioned portable syringe pump, comprises the following steps: selecting a suitable piston, fixing and assembling it on a push rod, taking a corresponding syringe, and sleeved it on the piston, fixing the syringe on a pump body, and connecting a subsequent infusion tube; The first driving mechanism is started, and the driving plate is used to drive the push plate to move, thereby pushing or pulling the push handle, so that the syringe draws or injects the injection liquid; During the process of injecting the syringe, when the injection flow rate needs to be increased, the first driving mechanism is driven in the forward direction, and the spacing between the push plate and the driving plate of the second driving mechanism is slowly increased, and during the period when the second driving mechanism continues to work, the injection flow rate is increased, and the flow rate increase amount is adjusted by further adjusting the spacing driving amount of the second driving mechanism in the corresponding time period; When the injection flow rate needs to be reduced, the first driving mechanism remains unchanged, and the spacing between the push plate and the driving plate is slowly reduced in the second driving mechanism, and the injection flow rate is reduced during the period when the second driving mechanism continues to work, and the flow rate reduction amount is adjusted by further adjusting the spacing driving amount of the second driving mechanism in the corresponding time period; During the syringe extraction process, when the extraction speed needs to be increased, the first drive mechanism is driven in the reverse direction, and the spacing between the push plate and the drive plate of the second drive mechanism is slowly reduced, and the extraction speed is increased during the period when the second drive mechanism continues to work, and the increase in the extraction speed is adjusted by further adjusting the spacing driving amount of the second drive mechanism in the corresponding time period; When the extraction speed needs to be reduced, the first driving mechanism remains unchanged, and the spacing between the push plate and the driving plate of the second driving mechanism slowly increases. During the period when the second driving mechanism continues to work, the extraction speed is reduced, and the reduction in the extraction speed is adjusted by further adjusting the spacing drive amount of the second driving mechanism in the corresponding time period.

[0017] The beneficial effect of the above technical solution is: 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 injection 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.

[0018] 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. 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, so that the distance between the push plate and the driving plate is increased or reduced. The first driving mechanism takes the driving plate as the driving object, and the push plate is the final propulsion implementation unit. The push plate propulsion amount is adjusted by compensating the length between the two.

[0019] 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

[0020] Figure 1 It is a schematic diagram of the implementation structure of the present invention; Figure 2 It is a schematic diagram of the main structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention; Figure 4 It is a schematic diagram of the implementation structure of the infusion tube; Figure 5 It is a schematic diagram of the implementation structure of the liquid adding component; Figure 6 is a schematic diagram of the implementation structure of the second driving mechanism; Figure 7 for Figure 6 A right view structural diagram of ; Figure 8 for Figure 6 Schematic diagram of the main structure; Fig. 9 for Figure 8 Middle AA section view; Fig.10 It is a schematic diagram of the structure of the control part of the present invention.

[0021] 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-blocking knob. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Embodiment 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, the injection speed may need to be temporarily adjusted according to the usage scenario and the patient's condition, such as increasing the flow rate or reducing the flow rate. However, the existing technology cannot provide this function for this demand, resulting in its limited use. Based on this, this embodiment provides a portable injection pump that can achieve both uniform speed and variable speed.

[0023] 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 arranged 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 prior arts and are not explained in this application.

[0024] The pump body 1 is provided with a mounting groove, the syringe 3 is provided with a mounting plate, the mounting plate is correspondingly mounted in the mounting groove and fixed by bolts, the piston 4 is detachably fixedly connected to the push rod 5, and multiple groups of mounting grooves are provided on the pump body 1; so that this embodiment can selectively install syringes 3 structures of various models and sizes on the pump body 1. When this embodiment is implemented, the piston 4 adopts a double-layer sealing method to ensure the sealing of the advancement process, which can effectively prevent drug leakage, and when in use, the piston and the syringe are a matching replaceable structure.

[0025] The front end of the syringe 3 is provided with an infusion tube, and a liquid adding assembly 14 and a filter 17 are provided on the infusion tube. A plugging head is provided at the end of the infusion tube. The specific infusion tube includes a round tube 13 and a triangular tube 15, wherein the round tube 13 is connected to the syringe 3, and the triangular tube 15 is arranged behind the liquid adding assembly 14. The round 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 the pipeline under higher pressure. The plugging head includes a nut 18 and a plugging knob 19, the nut is fixed on the triangular tube, and the plugging knob can be threadedly connected to the nut to achieve the front end plugging of the infusion tube.

[0026] The liquid adding component 14 includes a base 141, an anti-reverse valve 142 and a plug 144; the base 141 is a three-way structure, and a liquid inlet is arranged on one of its branches, and an anti-reverse valve 142 is arranged in the liquid inlet, and a liquid adding port 143 is arranged at the end of the anti-reverse valve 142, and a plug 144 is arranged 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 to prevent leakage during the infusion process; a 5μm filter is added to the terminal to better filter the crystallization points in the liquid medicine to ensure the safety of infusion. During the continuous infusion process, the present 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 solve the convenience and safety of use.

[0027] 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 7 and a driving sleeve 8; during implementation, a first driving cavity can be arranged in the pump body 1, the first screw 7 is rotatably arranged in the first driving cavity, and is transmission-connected to the first driving motor 9, and the first driving motor 9 is transmission-connected to the first screw via a multi-stage gear box, which has a large reduction ratio while meeting the requirements of low noise, high efficiency and wear resistance.

[0028] 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.

[0029] The first driving cavity is provided with a square hole, the driving sleeve 8 is threadedly connected to the first screw rod 7, the driving plate 11 is fixedly connected to the driving sleeve 8 via the connecting seat 10, and the connecting seat 10 is adapted to be mounted in the square hole, thereby realizing the limiting of the driving sleeve 8.

[0030] As another embodiment, during implementation, an embedding block is provided at the bottom of the connecting seat, an embedding groove is provided in the pump body, the embedding block is adapted to be mounted in the embedding groove, and the embedding block may be a dovetail structure, thereby realizing the limiting of the driving sleeve 8.

[0031] 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.

[0032] In order to further adjust the working speed, the present 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.

[0033] Specifically, the second driving mechanism 6 includes a second driving motor 63, a second screw rod 64, an inner sleeve 61, an outer sleeve 62 and a driving disk 66. Structurally, the outer sleeve 62 and the inner sleeve 61 can be square or circular structures. The driving plate 11 is fixed to one end of the inner sleeve 61. When the first driving mechanism drives the driving sleeve 8 to move, the driving plate 11 can transmit power directly to the inner sleeve 61.

[0034] In order to adjust the spacing 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 transmission-connected to the external second drive motor 63. The inner sleeve 61 is provided with a plurality of sliding holes 65, and 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 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 mounted in the sliding holes 65 and extend to the outside of the inner sleeve 61. The outer 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, so as to limit the rotation state of the driving disk 66 by utilizing the structural limitation of the limit block and the sliding hole 65, and make the driving 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 on the end of the outer sleeve 62, so as to adjust the distance between the push plate 12 and the driving plate 11 by means of the overlapping amount of the inner sleeve 61 and the outer sleeve 62. During implementation, the second driving motor 63 is a motor with controllable forward and reverse rotation, which is connected to the control module in the pump body 1 through electric wires.

[0035] In the 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.

[0036] In order to ensure the stability of the structure, a positioning groove is provided on the pump body 1 in this embodiment, and a positioning block is provided on the push plate 12 and the drive plate 11. The positioning block is adapted to be mounted in the positioning groove to realize the linear translation of the push plate 12 and the drive plate 11, and further combined with the translational propulsion of the first drive mechanism and the translational increase or decrease adjustment of the second drive mechanism 6, finally the propulsion amount adjustment of the push plate 12 is realized.

[0037] Specifically, this embodiment also provides a control method for 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 sleeved it on the piston 4, fixing the syringe 3 on a pump body 1, and connecting a subsequent infusion tube; The first driving mechanism is started, and the driving plate 11 is used to drive the push plate 12 to move, thereby pushing or pulling the push handle, so that the syringe draws or injects the injection liquid; 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 spacing between the push plate 12 and the driving plate 11 of the second driving mechanism 6 is slowly increased, and the injection flow rate is increased during the continuous operation of the second driving mechanism 6, and the flow rate increase amount is adjusted by further adjusting the spacing driving amount of the second driving mechanism 6 in the corresponding time period; When the injection flow rate needs to be reduced, the first driving mechanism remains unchanged, and the spacing between the push plate 12 and the driving plate 11 of the second driving mechanism 6 is slowly reduced, and the injection flow rate is reduced during the period when the second driving mechanism 6 continues to work, and the flow rate reduction amount is adjusted by further adjusting the spacing driving amount of the second driving mechanism 6 in the corresponding time period; During the syringe extraction process, when the extraction 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, and the extraction speed is increased during the period when the second drive mechanism 6 continues to work, and the increase in the extraction speed is adjusted by further adjusting the distance driving amount of the second drive mechanism 6 in the corresponding time period; When the extraction speed needs to be reduced, the first driving mechanism remains unchanged, and the spacing between the push plate 12 and the driving plate 11 of the second driving mechanism 6 slowly increases, and the extraction speed is reduced during the period when the second driving mechanism 6 continues to work. The reduction amount of the extraction speed is adjusted by further adjusting the spacing driving amount of the second driving mechanism 6 in the corresponding time period. The specific features of this embodiment are as follows: Traditional injection pumps can usually only achieve uniform injection, but in actual applications, it is often necessary to temporarily adjust the injection speed according to the patient's specific conditions and injection requirements. The portable injection pump realizes the function of temporarily and smoothly adjusting the injection speed on the basis of uniform injection through the cooperation of the first drive mechanism and the second drive mechanism 6, 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. At the same time, the second drive mechanism 6 can linearly adjust the spacing 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 accurate. 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, without complicated operating steps and professional skills, which reduces the threshold and difficulty of use.

[0038] Embodiment 2, based on embodiment 1, further explains its control principle.

[0039] Specific as Fig.10 As shown in , the main product structure of this embodiment is control part + mechanical transmission + medicine storage device + infusion pipeline, and the control part includes microcontroller, power monitoring, clock module, memory, alarm prompt circuit and peripheral logic circuit; instructions are issued 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 low voltage alarm, low medicine alarm, blockage alarm, infusion completion alarm, detachment alarm, pump not running alarm and other functions; the above circuits in this embodiment are prior art and will not be repeated here.

[0040] The embodiments of the present invention described above do not constitute a limitation on the protection scope of the present invention. The basic concept of the present invention is to realize the working speed adjustment of the injection pump without stopping the machine by configuring the first driving mechanism and the second driving mechanism. While meeting the basic requirements, the propulsion amount and working speed within the control time period can be further adjusted. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A portable injection pump, characterized in that: It includes 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 arranged in the syringe, a push rod is arranged 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 a working state, so as to increase or decrease the flow rate.

2. The portable injection pump according to claim 1, characterized in that: 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; the driving plate is fixedly connected to the driving sleeve via a connecting seat.

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

4. The portable injection pump according to claim 1, characterized in that: 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 arranged in the inner sleeve, and is drivingly 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 outwardly, 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.

5. The portable injection pump according to claim 4, 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 arranged on the shaft seat.

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

7. 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, 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.

8. 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, which is correspondingly clamped in the mounting groove and fixed by bolts.

9. The portable injection pump according to claim 8, 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.

10. A method for controlling a portable injection pump, using the portable injection pump according to claim 1, characterized in that: The method comprises the following steps: selecting a suitable piston, fixing and assembling it on the push rod, taking a corresponding syringe, and sleeved it on the piston, fixing the syringe on the pump body, and connecting the subsequent infusion tube; The first driving mechanism is started, and the driving plate is used to drive the push plate to move, thereby pushing or pulling the push handle, so that the syringe draws or injects the injection liquid; During the process of injecting the syringe, when the injection flow rate needs to be increased, the first driving mechanism is driven in the forward direction, and the spacing between the push plate and the driving plate of the second driving mechanism is slowly increased, and during the period when the second driving mechanism continues to work, the injection flow rate is increased, and the flow rate increase amount is adjusted by further adjusting the spacing driving amount of the second driving mechanism in the corresponding time period; When the injection flow rate needs to be reduced, the first driving mechanism remains unchanged, and the spacing between the push plate and the driving plate is slowly reduced in the second driving mechanism, and the injection flow rate is reduced during the period when the second driving mechanism continues to work, and the flow rate reduction amount is adjusted by further adjusting the spacing driving amount of the second driving mechanism in the corresponding time period; During the syringe extraction process, when the extraction speed needs to be increased, the first drive mechanism is driven in the reverse direction, and the spacing between the push plate and the drive plate of the second drive mechanism is slowly reduced, and the extraction speed is increased during the period when the second drive mechanism continues to work, and the increase in the extraction speed is adjusted by further adjusting the spacing driving amount of the second drive mechanism in the corresponding time period; When the extraction speed needs to be reduced, the first driving mechanism remains unchanged, and the spacing between the push plate and the driving plate of the second driving mechanism slowly increases. During the period when the second driving mechanism continues to work, the extraction speed is reduced, and the reduction in the extraction speed is adjusted by further adjusting the spacing drive amount of the second driving mechanism in the corresponding time period.

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