Injection device capable of controlling flow rate of liquid medicine

Abstract

The invention discloses an injection device with a controllable liquid medicine flow rate. The injection device comprises a base, a fixing seat and a mounting plate are arranged at the two ends of the top of the base respectively, a bearing seat used for bearing an injection needle cylinder is arranged at the top of the fixing seat, a clamping plate and a push plate are arranged between the fixing seat and the mounting plate, and a guide plate penetrating through the clamping plate and the push plate in a sliding mode and a positioning assembly between the clamping plate and the push plate are arranged between the fixing seat and the mounting plate. A driving assembly is arranged in the mounting plate, the output end of the driving assembly is in transmission fit with the push plate and used for driving the push plate to move along the guide plate, and a feedback assembly linked with the positioning assembly is further arranged in the mounting plate; during use, the constant-force spring, the worm, the worm gear and the lead screw are matched, so that the propelling speed of the push plate is accurately controlled, uniform-speed and accurate injection of liquid medicine is realized, and the problems of non-uniform pressure and inaccurate dosage of manual injection are solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an injection device with controllable drug flow rate. Background Technology

[0002] A drug delivery device with controllable flow rate is a medical device that can deliver drugs into the patient's body at a preset, constant rate. Its core purpose is to replace traditional manual injection and achieve precise, automated, and safe drug delivery.

[0003] Chinese Patent Publication No. CN118000857A discloses a controllable speed and volume injection device for solid tumors, including a base, a syringe, and a linear reciprocating drive mechanism. The syringe includes an injection cylinder fixed above the base, a push plate for pushing a piston in the injection cylinder to perform linear reciprocating motion, and a puncture needle located at the head of the injection cylinder. The linear reciprocating drive mechanism includes a rotary drive component and a lead screw connected to the output end of the rotary drive component. The output end of the lead screw is connected to the push plate.

[0004] The aforementioned device uses a motor-driven lead screw mechanism to precisely push the syringe piston, thereby achieving electronic control of injection speed and dosage. However, in actual use, due to the high density and pressure inside tumor tissue, when the needle injects the drug solution, it may encounter significant resistance, resulting in strong back pressure. Therefore, the aforementioned device relies solely on the torque of the motor for propulsion. When encountering resistance, it is easy for the motor to burn out, or forcibly pushing it may cause the tumor to tear, and the drug solution may accidentally enter blood vessels or normal tissue.

[0005] Therefore, it is necessary to provide an injection device with controllable drug flow rate to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide an injection device with controllable drug flow rate to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an injection device with controllable drug flow rate, comprising a base; a fixed seat and a mounting plate are respectively provided at the top two ends of the base; a support seat for supporting an injection syringe is provided at the top of the fixed seat; a clamping plate and a push plate are provided between the fixed seat and the mounting plate; a guide plate that slides through the clamping plate and the push plate is provided between the fixed seat and the mounting plate; a positioning component is provided between the clamping plate and the push plate; a driving component is provided inside the mounting plate; the output end of the driving component is driven to the push plate to drive it to move along the guide plate; a feedback component that is linked with the positioning component is also provided inside the mounting plate; when the driving component rotates, the driving component drives the push plate to move towards the fixed seat; when the push plate moves towards the fixed seat, the push plate pushes the clamping plate to move through the positioning component; when the positioning component is compressed, the positioning component causes the feedback component to move towards the driving component.

[0008] As a further aspect of the present invention: the positioning component includes an airbag and a positioning spring; both the airbag and the positioning spring are disposed between the card plate and the push plate.

[0009] As a further aspect of the present invention: the feedback component includes a T-shaped box, the T-shaped box has an air chamber, a friction block is elastically connected to the air chamber in a sealed manner, and the air chamber is connected to the airbag through a first connecting pipe; a limiting rod is provided below the friction block.

[0010] As a further embodiment of the present invention: the drive assembly includes a worm and a worm wheel meshing with the worm; the worm is rotatably disposed at the bottom end of the mounting plate, and a lead screw is fixedly disposed at the end of the worm wheel near the fixed seat, and the push plate is threadedly engaged with the lead screw.

[0011] As a further embodiment of the present invention: a friction ring is fixedly provided at the center of the end of the worm gear away from the lead screw, the bottom of the friction block corresponds to the friction ring, and the bottom of the limiting rod corresponds to the worm gear.

[0012] As a further embodiment of the present invention: a first rotating shaft is rotatably provided on the side of the mounting plate away from the worm gear, a positioning post is slidably provided at the end of the first rotating shaft near the worm gear, a positioning hole is provided at one end of the worm gear that is slidably adapted to the positioning post, a constant force spring is wound around the outside of the first rotating shaft, and a second rotating shaft is wound around the end of the constant force spring away from the first rotating shaft, and the second rotating shaft is fixedly connected to the mounting plate.

[0013] As a further aspect of the present invention: one end of the first rotating shaft extends to the outside of the mounting plate and is fixedly connected to a knob, and the mounting plate is provided with a positioning pin that cooperates with the knob.

[0014] As a further aspect of the present invention: a first movable plate is slidably connected to the side of the card plate near the fixed base. The first movable plate has a notch, and an oil storage bag is provided in the notch. A hydraulic component is sleeved on the first rotating shaft and an oil cavity is provided inside it. The hydraulic component is connected to the oil storage bag. A channel for elastic sliding of the positioning column is provided inside the first rotating shaft, and an oil hole for connecting the channel and the oil cavity is provided on the first rotating shaft. A reset coil spring is also sleeved on the worm gear.

[0015] As a further embodiment of the present invention: a second movable plate is elastically connected to the top of the fixed base, the support is fixedly disposed on the top of the second movable plate, and a cam is disposed below the second movable plate, the cam being rotatably connected to the inner wall of the fixed base.

[0016] As a further embodiment of the present invention: a collar is rotatably fitted around one end of the lead screw that extends into the inner wall of the fixed seat, the collar is connected to the cam drive, a mating block is elastically connected to the inner wall of the collar, a wedge block is fixedly provided around the lead screw that slides in accordance with the mating block, and a roller is rotatably provided on the inner wall of the clamping plate that slides in contact with both sides of the first movable plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: In use, the push plate's advancing speed is precisely controlled through the cooperation of a constant force spring, worm gear, worm wheel, and lead screw, achieving uniform and accurate injection of the liquid medicine and avoiding the problems of uneven pressure and inaccurate dosage in manual injection; Secondly, through the linkage of the positioning component consisting of an airbag and a positioning spring and the feedback component consisting of a T-shaped box, friction block, and limiting rod, the injection resistance can be monitored in real time. When the resistance increases abnormally, the speed of the drive component is reduced or stopped by increasing friction or limiting, effectively preventing tissue damage and accidental injection of the liquid medicine caused by forced injection. Attached Figure Description

[0018] Figure 1 This is a frontal three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the side three-dimensional structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the constant force spring in this invention.

[0021] Figure 4 For the present invention Figure 3 A schematic diagram of the structure at point B.

[0022] Figure 5 This is a schematic diagram of the airbag structure in this invention.

[0023] Figure 6 This is a schematic diagram of the limiting rod in this invention.

[0024] Figure 7 For the present invention Figure 1 A schematic diagram of the structure at point A in the middle.

[0025] Figure 8 This is a schematic diagram of the storage bag and roller in this invention.

[0026] Figure 9 This is a schematic diagram of the cam structure in this invention.

[0027] Figure 10 This is a schematic diagram of the structure of the wedge block and the mating block in this invention.

[0028] In the diagram: 1. Base; 2. Fixed seat; 3. Mounting plate; 4. Injection syringe; 5. Guide plate; 6. Clamping plate; 7. Push plate; 8. Lead screw; 9. First movable plate; 10. Support seat; 11. Second movable plate; 12. Cam; 13. Hydraulic component; 14. First rotating shaft; 15. Constant force spring; 16. Worm gear; 17. Return coil spring; 18. Second rotating shaft; 19. T-shaped box; 20. Positioning pin; 21. Friction ring; 22. Worm gear; 23. Friction block; 24. Airbag; 241. Positioning spring; 25. Positioning hole; 26. Limiting rod; 27. Slide groove; 28. Positioning pin; 29. ​​Knob; 30. Oil reservoir; 31. Roller; 32. Collar; 33. Wedge block; 34. Mating block. Detailed Implementation

[0029] Please see Figures 1-10 In this embodiment of the invention, an injection device with controllable drug flow rate includes a base 1. A fixed seat 2 and a mounting plate 3 are respectively provided at both ends of the top of the base 1. A support seat 10 is provided at the center of the top of the fixed seat 2, and a support seat 10 for supporting an injection syringe 4 is provided on the top of the fixed seat 2. A retaining plate 6 and a push plate 7 are provided between the fixed seat 2 and the mounting plate 3. The retaining plate 6 is located on the side of the push plate 7 closest to the fixed seat 2. A guide plate 5, symmetrically arranged along the center between the fixed seat 2 and the mounting plate 3, slides through the retaining plate 6 and the push plate 7. The positioning component between 7, the drive component is provided on the side of the mounting plate 3 away from the worm gear 16, the feedback component is provided at the top of the mounting plate 3, the output end of the drive component extends through the mounting plate 3 and the push plate 7 to the inner wall of the fixed seat 2, and the drive component and the push plate 7 are rotatably engaged. When the drive component rotates, the drive component drives the push plate 7 to move towards the fixed seat 2. When the push plate 7 moves towards the fixed seat 2, the push plate 7 pushes the clamping plate 6 to move through the positioning component. When the positioning component is compressed, the positioning component causes the feedback component to move towards the drive component.

[0030] It should be noted that the injection syringe 4 includes an outer syringe tube, a piston rod, and a piston; the piston and piston rod are assembled and connected, and the piston is slidably disposed inside the outer syringe tube. Preferably, one end of the piston rod is connected to the piston, and the other end has a pressing head. The open end of the outer syringe tube has a flange symmetrically arranged around the center for clamping and applying force during operation. The conical end has a Luer sliding joint for connecting a needle or infusion tubing, and the syringe body is printed with a capacity scale. The injection syringe 4 is specifically existing technology, and its detailed structure and working principle will not be described in detail here.

[0031] In actual use, the syringe 4 is filled with the medication to be injected. The support 10 has a semi-circular cross-section, providing good support for the syringe 4. When tumor injection is required, the outer tube of the syringe 4 is placed on the support 10, with its flange fitting against the side wall of the support 10, thus better advancing the syringe 4 during injection. The end of the piston rod of the syringe 4 corresponds to the position of the clamping plate 6. The syringe 4 is fixed to the support 10 by a buckle, ensuring stability during uniform injection of the medication. After the syringe 4 is assembled, the infusion tubing is connected to the syringe 4. Then, the drive assembly is activated, causing the push plate 7 to move towards the fixed seat 2 and push the clamping plate 6 to move, allowing... The clamping plate 6 moves at a constant speed and comes into contact with the end of the piston rod on the syringe 4, thereby pushing the piston rod to move inside the outer tube of the syringe, thus achieving the effect of uniform injection of the drug solution. When there is resistance during injection, the clamping plate 6 continues to move at a constant speed, while the push plate 7 is simultaneously subjected to resistance due to its contact with the syringe 4. At this time, the positioning component will be compressed according to the magnitude of the resistance experienced by the push plate 7, thereby causing the feedback component to move towards the drive component, reducing or even stopping the rotation speed of the drive component. This avoids the problem that when the needle injects the drug solution and encounters large resistance and generates strong back pressure, the drive component will continue to advance, which could easily lead to tumor tearing, drug solution entering blood vessels or normal tissue.

[0032] Please see Figure 1 , Figure 3 , Figure 5Preferably, the positioning component includes an airbag 24 and a positioning spring 241. Both the airbag 24 and the positioning spring 241 are positioned between the clamping plate 6 and the push plate 7. Multiple sets of positioning springs 241 can be arranged between the clamping plate 6 and the push plate 7 as needed. Through the cooperation of the positioning spring 241 and the airbag 24, real-time safety redundancy for injection is achieved, preventing problems such as tissue tearing, accidental drug entry into blood vessels or normal tissue when the needle encounters significant resistance during drug injection. In actual use, under normal pressure, the clamping plate 6, under the action of the drive component, has a propulsion force less than the preload of the positioning spring 241, and the positioning spring 241 will not deform. Then, if the propulsion resistance is too high and the pressure exceeds the preload of the positioning spring 241, the positioning spring 241 is compressed. At this time, the airbag 24 is also compressed, and the compressed gas causes the feedback component to move towards the drive component, increasing the rotational resistance of the drive component. When the rotational resistance increases, it automatically uses more force to overcome the resistance, effectively reducing the propulsion force, thereby slowing down or even pausing the propulsion and avoiding tissue damage.

[0033] Please see Figures 3-6 Preferably, the feedback component includes a T-shaped box 19; the T-shaped box 19 is fixedly installed on the top of the inner wall of the mounting plate 3, and an air chamber is provided at the bottom of the T-shaped box 19. A friction block 23 is elastically connected in the air chamber. A limit rod 26 is fixedly provided on the lower middle part of the friction block 23 on one side opposite to the push plate 7. A first connecting pipe is provided between the air chamber and the air bag 24, so that the air bag 24 and the air chamber are connected through the first connecting pipe. The two ends of the air bag 24 are fixedly connected to the card plate 6 and the push plate 7 respectively. The bottom of the friction block 23 is an elastic telescopic structure, and the bottom of the friction block 23 is set with an arc structure, so as to better match the drive component. The bottom of the limit rod 26 is provided with a downward protrusion, and the side wall of the T-shaped box 19 is provided with a vertical groove for the sliding of the limit rod 26.

[0034] In actual use, when the syringe 4 is initially assembled on the support 10, the positioning spring 241 and the air bladder 24 are in normal condition, and the friction block 23 is retracted in the air chamber, meaning that the friction block 23 and the limiting rod 26 are far from the driving component. When the liquid is injected at a constant speed, if the injection resistance increases, the positioning spring 241 will deform and compress, thereby compressing the air bladder 24. The gas inside will then be input into the air chamber through the first connecting tube, thus pushing the friction block 23 downward. The downward movement of the friction block 23 will cause the limiting rod 26 to move downward. During this process, the friction block 23 will contact the driving component before the limiting rod 26, and the friction block 241 will move downward. The elastic structure at the bottom increases the frictional force that causes the drive component to rotate, thereby slowing it down. When the positioning spring 241 and airbag 24 are fully compressed, the movement of the friction block 23 causes the limiting rod 26 to engage with the drive component. Once the limiting rod 26 engages with the drive component, the drive component stops moving, thus avoiding continuous injection and tissue damage. If the resistance disappears, the positioning spring 241 and airbag 24 push the clamping plate 6 towards the fixed seat 2 and reset themselves. The friction block 23 or the limiting rod 26 then moves upward and separates from the drive component, allowing the drive component to continue the injection work at a constant speed.

[0035] Please see Figures 1-7 Preferably, the drive assembly includes a worm gear 16 and a worm wheel 22 meshing with the worm gear 16. The worm gear 16 is rotatably disposed at the bottom of the mounting plate 3, and one end of the worm gear 16 is rotatably connected to the side wall of the mounting plate 3. The worm wheel 22 is disposed above the worm gear 16 and is disposed on the vertical center line of the mounting plate 3. A lead screw 8 is fixedly disposed at the end of the worm wheel 22 near the fixed seat 2. The end of the lead screw 8 away from the worm wheel 22 extends through the side wall of the mounting plate 3 and the push plate 7 into the side wall of the fixed seat 2. The push plate 7 is threadedly engaged with the lead screw 8. When the worm gear 16 rotates, the worm gear 16 drives the worm wheel 22 to rotate, and the rotation of the worm wheel 22 drives the lead screw 8 to rotate. The rotation of the lead screw 8 causes the push plate 7 to move towards the fixed seat 2 under the guidance of the two sets of guide plates 5. Through the cooperation of the worm gear 16 and the positioning post 20, it is ensured that the lead screw 8 will not reverse during the uniform injection of the liquid medicine, that is, the push plate 7 will not retract.

[0036] Furthermore, preferably, a first rotating shaft 14 is rotatably arranged on the side of the mounting plate 3 away from the worm 16, and the first rotating shaft 14 has the same diameter as the worm 16 and is positioned accordingly. A positioning post 20 is slidably arranged at the end of the first rotating shaft 14 near the worm 16. The positioning post 20 has a polygonal cross-section. A positioning hole 25 is provided at the end of the worm 16 near the first rotating shaft 14, which is slidably adapted to the positioning post 20. A constant force spring 15 is wound around the outside of the first rotating shaft 14. A second rotating shaft 18 is wound around the end of the constant force spring 15 away from the first rotating shaft 14. The second rotating shaft 18 is located above the first rotating shaft 14 and is fixedly connected to the mounting plate 3. The setting of the constant force spring 15 ensures that the first rotating shaft 14 maintains a stable rotation speed after the constant force spring 15 stores energy, thereby achieving uniform and controllable injection of the liquid medicine.

[0037] To facilitate the rotation of the first rotating shaft 14, preferably, one end of the first rotating shaft 14 extends to the outside of the mounting plate 3 and is fixedly connected to a knob 29. Multiple sets of semi-circular blocks are arranged in an array around the knob 29. A sliding groove 27 is provided on one side of the top of the mounting plate 3. A positioning pin 28 is slidably arranged in the sliding groove 27. The bottom end of the positioning pin 28 cooperates with the top of the knob 29. The arrangement of the semi-circular blocks facilitates the rotation of the knob 29. The size of the bottom end of the positioning pin 28 is adapted to the size of the two sets of semi-circular blocks adjacent to the knob 29. In this way, after rotating the knob 29 to drive the first rotating shaft 14 to rotate and enable the constant force spring 15 to store energy, the knob 29 can be limited by sliding the positioning pin 28, that is, the first rotating shaft 14 can be limited. When injection is required, the positioning pin 28 can be removed.

[0038] Furthermore, preferably, a friction ring 21 is fixedly provided at the center of the end of the worm gear 22 away from the lead screw 8, the bottom of the friction block 23 in the feedback assembly is adapted to the top of the friction ring 21, and the tooth groove of the worm gear 22 is adapted to the bottom of the limiting rod 26 in the feedback assembly.

[0039] In actual use, when the syringe 4 is initially mounted on the support 10, the push plate 7 and the clamping plate 6 are both close to the mounting plate 3. At this time, the constant force spring 15 is in a contracted state, the positioning pin 20 is matched with the positioning hole 25, and the friction block 23 and the limiting rod 26 are both away from the worm gear 22. When it is necessary to inject the medicine, firstly rotate the knob 29 so that the constant force spring 15 is wound around the first rotating shaft 14 to store energy. At this time, if it is necessary to move or wait, the positioning pin 28 can be slid down to limit the knob 29. When the injection begins, the positioning pin 28 is slid up to separate from the knob 29. Then the constant force spring 15 elastically returns to its original position, thereby driving the first rotating shaft 14 to rotate. The rotation of the first rotating shaft 14 is controlled by the positioning pin 20 and the positioning hole. The interaction of 25 causes the worm gear 16 to rotate, which in turn causes the worm wheel 22 to rotate. The worm wheel 22 then drives the lead screw 8 to rotate, thereby moving the push plate 7 towards the fixed seat 2 and pushing the clamping plate 6 to push the piston rod on the syringe 4 towards the fixed seat 2, achieving the effect of uniform injection of the drug solution. If the injection encounters resistance, the push plate 7 will move relative to the clamping plate 6 and compress the positioning spring 241 and the air bladder 24. When the air bladder 24 is compressed, the gas inside it will enter the air chamber, driving the friction block 23 to move downward and contact the friction ring 21. When the friction block 23 contacts the friction ring 21, it increases the rotational resistance of the worm wheel 22, or the limiting rod 26 moves downward with the friction block 23 and matches the worm wheel 22, thereby stopping the worm wheel 22 from rotating, thus achieving uniform and controllable speed throughout the entire drug injection process.

[0040] Please see Figures 1-5 , Figures 8-10 Preferably, a first movable plate 9 is slidably connected to the top center of the side of the clamping plate 6 near the fixed base 2. The first movable plate 9 has a notch on the side near the fixed base 2, which is used to place the end of the piston rod on the syringe 4. The top opening of the notch is located at the top of the first movable plate 9. In this way, when the syringe 4 is assembled on the support 10, by adapting the piston rod on the syringe 4 to the notch, the syringe 4 is then snapped and fixed on the support 10. Furthermore, the worm gear 16 and the positioning post 20 cooperate to achieve self-locking of the lead screw 8. This ensures that after the syringe 4 is assembled, only the rotation of the worm gear 16 can cause the push plate 7 to push the clamping plate 6 and thus push the piston rod forward to advance the liquid medicine. This avoids the problem that if the piston rod on the syringe 4 is simply attached to the clamping plate 6, external force can still push the piston rod of the syringe 4 forward at will, causing the liquid medicine to be injected too quickly or in excessive amounts.

[0041] Furthermore, preferably, the first movable plate 9 has an oil storage bag 30 with a protruding notch inside its side wall, the first rotating shaft 14 is equipped with a hydraulic component 13 around its periphery, and the hydraulic component 13 is fixedly connected to the inner wall of the mounting plate 3. A second connecting pipe is provided between the hydraulic component 13 and the oil storage bag 30. An oil cavity is provided inside the hydraulic component 13. The first rotating shaft 14 passes through the hydraulic component 13 and the oil cavity inside the hydraulic component 13, and the hydraulic component 13 is sealed and rotatably connected. A channel for the sliding of the positioning post 20 is provided inside the first rotating shaft 14. The positioning post 20 is elastically connected to the first rotating shaft 14, and the positioning post 20 and the first rotating shaft 14 are in a sealed sliding state. An oil hole is provided on the first rotating shaft 14 to allow the channel and the oil cavity to communicate. A groove is provided on the top of a set of guide plates 5, and the groove is used for placing the second connecting pipe.

[0042] During use, when the syringe 4 is not mounted on the support 10, the oil reservoir 30 is inflated and protrudes into the notch. The positioning pin 20 elastically retracts into the first rotating shaft 14, separating from the positioning hole 25. The constant force spring 15 is in an energy storage state, and the positioning pin 28 limits the knob 29. During injection, the piston rod of the syringe 4 is fitted into the notch. In this process, the syringe 4 first compresses the oil reservoir 30, causing it to contract. A portion of the oil enters the hydraulic component 13 through the second connecting pipe, and then enters the channel through the oil hole, pushing the positioning pin 20 towards the positioning hole 25 and extending... The injection syringe 4 is inserted into the positioning hole 25, and the oil storage bag 30, due to the pressure, can fully fit with the piston rod end of the injection syringe 4, positioning it in the notch and making it difficult to move. Then, the injection syringe 4 is fixed on the support seat 10 with a buckle, and the positioning pin 28 is slid upward to release the knob 29 from the limit. Then, the first rotating shaft 14 rotates, driving the worm gear 16 to rotate through the cooperation of the positioning pin 20 and the positioning hole 25. Thus, through the cooperation of various components, the injection of the liquid is achieved at a uniform and controllable speed. When the injection is completed, the injection syringe 4 is removed, the positioning pin 20 elastically resets, and then the oil is squeezed to make the oil storage bag 30 expand and reset.

[0043] To ensure that the clamping plate 6 and push plate 7 automatically reset after the syringe 4 is removed, preferably, a reset coil spring 17 is provided on the periphery of the end of the worm gear 16 away from the first rotating shaft 14. It should be noted that the elasticity of the constant force spring 15 is greater than that of the reset coil spring 17. Thus, when the worm gear 16 rotates, the reset coil spring 17 stores energy. After the syringe 4 is removed after injection, the positioning post 20 separates from the positioning hole 25, and then the reset coil spring 17 elastically resets, causing the worm gear 16 to reverse, thereby causing the worm wheel 22 and lead screw 8 to reverse, and then causing the push plate 7 to move and reset the clamping plate 6. The reset coil spring 17 enables the worm gear 16 to rotate and reset automatically after being driven by the constant force spring 15 and after the positioning post 20 is disengaged from the positioning hole 25, thereby driving the push plate 7 and clamping plate 6 to move and reset without manual reset.

[0044] Furthermore, preferably, a second movable plate 11 is elastically connected to the top center of the fixed base 2, and a support 10 is fixedly installed at the top center of the second movable plate 11. A cam 12 is provided below the second movable plate 11, and the cam 12 is rotatably connected to the inner wall of the fixed base 2. A collar 32 is rotatably fitted around one end of the screw 8 that extends into the inner wall of the fixed base 2. The collar 32 and the cam 12 are connected by a belt drive. A mating block 34 is elastically connected to the inner wall of the collar 32. A wedge block 33 is fixedly installed around the screw 8 that slides and fits correspondingly to the mating block 34. A roller 31 is rotatably installed on the inner wall of the clamping plate 6 that slides and fits against both sides of the first movable plate 9. Multiple sets of rollers 31 are arranged in a vertical array.

[0045] In actual use, when injecting the drug solution, the rotation of the lead screw 8 will drive the wedge block 33 to rotate. At this time, the rotation of the wedge block 33 will conflict with the mating block 34. Through the conflict and cooperation between the two, the collar 32 will rotate. The rotation of the collar 32 will drive the cam 12 to rotate. The rotation of the cam 12 will cooperate with the bottom of the second movable plate 11, thereby realizing the reciprocating micro-vibration of the second movable plate 11 in the vertical direction. By setting the rollers 31 on both sides of the first movable plate 9, the friction between the first movable plate 9 and the clamping plate 6 is reduced as much as possible, so that the injection syringe 4 vibrates smoothly as a whole, thereby achieving full mixing of the drug solution in the injection syringe 4, avoiding the problem of partial drug solution precipitation and stratification, and ensuring that the drug solution is fully applied. When the injection is completed and the lead screw 8 is rotated to reset, although the lead screw 8 drives the wedge block 33 to rotate, the wedge block 33 will not conflict or interfere with the mating block 34 at this time. Therefore, when the lead screw 8 is rotated to reset, the collar 32 will not rotate, thereby avoiding the cam 12 from spinning idly and affecting the user experience.

Claims

1. A medicine injection device with controllable flow rate, comprising a base; characterized in that, The top of the base is provided with a fixing seat and a mounting plate at both ends respectively, the top of the fixing seat is provided with a supporting seat for supporting the injection syringe, a clamping plate and a push plate are arranged between the fixing seat and the mounting plate, a guide plate slidingly penetrating the clamping plate and the push plate is arranged between the fixing seat and the mounting plate, a positioning assembly is arranged between the clamping plate and the push plate, a driving assembly is arranged in the mounting plate, the output end of the driving assembly is in transmission cooperation with the push plate for driving the push plate to move along the guide plate, and a feedback assembly in linkage with the positioning assembly is further arranged in the mounting plate; when the driving assembly rotates, the driving assembly drives the push plate to move towards the fixing seat, when the push plate moves towards the fixing seat, the push plate drives the clamping plate to move through the positioning assembly, when the positioning assembly is compressed, the positioning assembly drives the feedback assembly to move towards the driving assembly.

2. The injection device of claim 1, wherein the control means comprises a control member which is rotatable relative to the housing and which is arranged to be rotated by the user to control the flow rate of the medicament. The positioning assembly comprises an air bag and a positioning spring; the air bag and the positioning spring are arranged between the clamping plate and the push plate.

3. The injection device of claim 2, wherein the needle is configured to be retracted into the housing when the plunger is in the second position. The feedback assembly comprises a T-shaped box, an air cavity is arranged in the T-shaped box, a friction block is elastically connected in the air cavity in a sealed manner, and the air cavity is in communication with the air bag through a first connecting pipe; a limiting rod is arranged below the friction block.

4. The injection device of claim 3, wherein the needle is configured to be retracted into the housing when the plunger is in the second position. The driving assembly comprises a worm and a worm gear engaged with the worm; the worm is rotationally arranged at the bottom end in the mounting plate, a lead screw is fixedly arranged at one end of the worm gear close to the fixing seat, and the push plate is in screw cooperation with the lead screw.

5. The injection device of claim 4, wherein the needle is configured to be retracted into the housing when the plunger is in the second position. A friction ring is fixedly arranged at the center of one end of the worm gear away from the lead screw, the bottom of the friction block corresponds to the friction ring, and the bottom of the limiting rod corresponds to the worm gear.

6. The injection device of claim 4, wherein the needle is configured to be inserted into a patient's skin when the plunger is in the second position. A first rotating shaft is rotationally arranged on one side of the mounting plate away from the worm, a positioning column is slidingly arranged at one end of the first rotating shaft close to the worm, one end of the worm is provided with a positioning hole in sliding cooperation with the positioning column, a constant force spring is wound around the periphery of the first rotating shaft, a second rotating shaft is wound around one end of the constant force spring away from the first rotating shaft, and the second rotating shaft is fixedly connected with the mounting plate.

7. The injection device of claim 6, wherein the needle is configured to be retracted into the housing when the plunger is in the second position. One end of the first rotating shaft extends to the outside of the mounting plate and is fixedly connected with a knob, and the mounting plate is provided with a positioning pin matched with the knob.

8. The injection device of claim 7, wherein the needle is configured to be inserted into a patient's skin when the plunger is in the second position. A first movable plate is slidingly connected to one side of the clamping plate close to the fixing seat, an opening is formed in the first movable plate, an oil storage bag is arranged in the opening, a hydraulic part is sleeved on the first rotating shaft and an oil cavity is arranged in the hydraulic part, the hydraulic part is in communication with the oil storage bag, a channel for elastic sliding of the positioning column is arranged in the first rotating shaft, an oil hole for communication between the channel and the oil cavity is arranged on the first rotating shaft, and a reset coil spring is further sleeved on the worm.

9. The injection device of claim 8, wherein the needle is configured to be inserted into a patient's skin when the plunger is in the second position. A second movable plate is elastically connected to the top of the fixing seat, the supporting seat is fixedly arranged at the top of the second movable plate, a cam is arranged below the second movable plate, and the cam is rotationally connected with the inner wall of the fixing seat.

10. The injection device of claim 9, wherein the needle is configured to be inserted into the patient's skin when the plunger is in the second position. A sleeve ring is rotationally matched with the periphery of one end of the lead screw extending into the inner wall of the fixing seat, the sleeve ring is in transmission cooperation with the cam, the inner wall of the sleeve ring is elastically connected with a matching block, the periphery of the lead screw is fixedly provided with a wedge-shaped block in sliding cooperation with the matching block, and the inner wall of the clamping plate is rotationally provided with a roller in sliding cooperation with both sides of the first movable plate.

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