Dosing device of automatic injector

Abstract

The invention discloses an automatic injector dosing device, which relates to the technical field of medical instruments, comprises a tube body, and is characterized in that a first movable rod is movably connected to the inner side of the tube body, a piston is mounted at the end part of the first movable rod, a second spring is fixedly mounted between the piston and the inner wall of the tube body, and a sliding block is arranged on the inner side of the tube body in a sliding manner; a needle head is installed at the end of the sliding block, a protective sleeve is movably connected to the end of the tube body, ejector rods are symmetrically and movably connected to the end of the tube body, and the first movable rod drives a piston to extrude the ejector rods after being pressed. According to the syringe needle, it can be ensured that medical staff cannot make direct contact with the exposed syringe needle when preparing for injection, and therefore the risk of needle pricking injury is reduced, and pollution to the syringe needle when sterile operation of the medical staff is not standard can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to an automatic syringe dosing device. Background Art

[0002] Automatic syringes are usually composed of parts such as a needle, a syringe, a piston, and a pushing device. The pushing device provides power for automatic injection and can push out the liquid in the syringe for injection and medication. This allows medical staff to give patients the required medication more quickly and accurately.

[0003] After searching, the invention patent with Chinese patent number CN118320229A discloses a new type of automatic suction and injection syringe auxiliary device. Compared with the prior art, the invention patent with Chinese patent number CN118320229A assists the automatic suction and injection of the syringe by providing a barrel on which the syringe can be installed, a driving mechanism that can drive the syringe to automatically complete the suction or injection action, and a control component that controls the driving mechanism, so as to facilitate repeated operation with one hand, improve injection efficiency, reduce operating errors, and reduce operating risks. It is of great significance to improving the performance and convenience of medical injection equipment.

[0004] However, in actual use of the above device, before injection, medical staff need to manually remove the protective cover on the needle, which may easily lead to mistakes in the process of removing the needle protective cover, resulting in needle stick injuries. In addition, the medical staff's improper aseptic operation may also easily contaminate the exposed needle. After the injection and dosing work is completed, the medical staff need to manually remove the needle or re-put on the protective cover in time. Since the needle has been used, there will be drug residues on the needle, and there may also be patient blood and tissue fluid residues. In the process of putting the protective cover back on the needle, it is easy to be stabbed or scratched by the needle, thereby causing infection. Therefore, an automatic syringe dosing device is proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art that the needle is easy to stab medical staff, and the medical staff's non-standard aseptic operation is also easy to contaminate the exposed needle, and an automatic syringe dosing device is proposed.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An automatic syringe dosing device comprises a tube body, a first movable rod is movably connected to the inner side of the tube body, a piston is installed at the end of the first movable rod, a second spring is fixedly installed between the piston and the inner wall of the tube body, a sliding block is slidably arranged on the inner side of the tube body, a needle is installed at the end of the sliding block, a protective sleeve is movably connected to the end of the tube body, and a push rod is symmetrically movably connected to the end of the tube body, the first movable rod drives the piston to squeeze the push rod after being pressed, the push rod is squeezed by the piston to move, and then squeezes the protective sleeve, so that the protective sleeve is automatically separated from the tube body, and medical staff do not need to manually remove the protective sleeve, which can ensure that medical staff will not directly contact the exposed needle when preparing for injection, thereby reducing the risk of needle stick injury;

[0008] The tube body is provided with an automatic retraction assembly for the needle, and the automatic retraction assembly includes a second movable rod and a first extrusion rod respectively slidably arranged inside the tube body, and a pressure rod installed at the end of the first extrusion rod; a circular plate is slidably arranged on the inner side of the tube body, a second extrusion rod is installed on the side of the circular plate, a fixing block is installed on the inner side of the circular plate, a plurality of fixing grooves are opened on the side of the first movable rod, and when the circular plate is pressed, the fixing block is driven to move to the outside of the fixing groove, so as to release the connection between the first movable rod and the tube body, and continue to press the retraction rod. The shaped plate causes the second extrusion rod to squeeze the pressure rod. After the pressure rod is squeezed, it drives the first extrusion rod to move, so that the first extrusion rod squeezes the second movable rod. After the second movable rod is squeezed, it moves upward, and the limit between the second movable rod and the sliding block is released. The sliding block drives the needle to automatically retract into the inner side of the tube body. After the sliding block moves, it no longer blocks the second movable rod. The second movable rod moves downward to automatically close the tube body, reducing the risk of medical staff or patients being injured due to accidentally touching the needle, and ensuring that there is no residual and overflow of liquid medicine after injection, so as to keep the medical environment clean.

[0009] The above technical solution further includes:

[0010] A connecting tube is installed at the end of the tube body. The connecting tube is movably connected to the protective sleeve. The size of the opening of the protective sleeve is matched with the size of the connecting tube. The protective sleeve is inserted on the connecting tube to seal the needle.

[0011] The third spring is installed at one end of the two push rods extending to the inner side of the tube body. The end of the third spring away from the piston is fixedly connected to the inner wall of the tube body. The push rod is moved by the compression of the piston and then compresses the protective sleeve.

[0012] A first sliding groove is provided inside the tube body, and the sliding block is slidably arranged on the inner side of the first sliding groove. The size of the opening of the first sliding groove is adapted to the size of the sliding block, and the sliding block is communicated with the needle. A first square groove is provided on the upper part of the sliding block, and a second sliding groove is provided on the inner side of the first sliding groove. A first spring is installed on the inner side of the second sliding groove, and one end of the first spring close to the needle is fixedly connected to the sliding block, and the needle is automatically retracted into the inner side of the tube body by the sliding block moving along the first sliding groove.

[0013] A second square groove is provided inside the tube body, and the second movable rod is slidably arranged on the inner side of the second square groove. The size of the opening of the first square groove is adapted to the size of the second movable rod. A fourth spring is installed on the upper part of the second movable rod, and the end of the fourth spring away from the second movable rod is fixedly connected to the inner wall of the second square groove. An opening groove is provided on the side of the second square groove, so that the second movable rod can be moved to the outside of the first square groove to release the limit on the sliding block.

[0014] A third sliding groove is provided on the inner wall of the tube body, and the first extrusion rod is slidably connected to the third sliding groove. The pressure rod is installed on the side of the first extrusion rod close to the circular plate. A fifth spring is installed at the bottom of the first extrusion rod, and the end of the fifth spring away from the first extrusion rod is fixedly connected to the tube body. When the first extrusion rod moves, it squeezes the inclined part of the open groove to drive the second movable rod to move.

[0015] The cross section of the compression rod is trapezoidal, and the compression rod is located on the movement track of the second extrusion rod. The second extrusion rod compresses the inclined surface of the compression rod to drive the compression rod to move downward.

[0016] The tube body is movably connected to a third movable rod inside, and a pressing plate is installed at one end of the third movable rod extending to the outside of the tube body. The end of the third movable rod away from the pressing plate is fixedly connected to the circular plate, and a sixth spring is installed between the circular plate and the inner wall of the tube body. The fixed block inside the circular plate is always inserted into the fixed groove in its initial state through the expansion and contraction of the sixth spring.

[0017] The cross section of the fixing block is trapezoidal, and the plurality of fixing grooves are vertically and evenly distributed on the first movable rod, and the size of the fixing groove opening is adapted to the size of the fixing block, thereby ensuring the stability of the fixing block inserted into the fixing groove.

[0018] The width of the second movable rod is equal to the width of the first sliding groove, thereby ensuring the closure of the tube body.

[0019] The present invention has the following beneficial effects:

[0020] 1. In the present invention, by setting a push rod, the piston can be pressed to squeeze the push rod by pressing the first movable rod, so that the protective cover can be automatically ejected, and the medical staff does not need to manually remove the protective cover. This can ensure that the medical staff will not directly contact the exposed needle when preparing for injection, thereby reducing the risk of needle stick injuries and avoiding contamination of the needle caused by non-standard aseptic operation of the medical staff.

[0021] 2. In the present invention, an automatic retraction component is provided so that the tube can be automatically retracted into the tube body after the injection work is completed. At the same time, the tube body can be automatically closed by the second movable rod to prevent the residual liquid medicine in the tube body from overflowing, thereby reducing the risk of medical staff or patients being injured due to accidental contact with the needle. This is particularly important when dealing with infectious patients, ensuring that no liquid medicine will remain and overflow after the injection, and keeping the medical environment clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of the automatic syringe dosing device proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of the overall end cross-sectional structure of the present invention;

[0024] Figure 3 It is a schematic side cross-sectional view of the whole of the present invention;

[0025] Figure 4 for Figure 2 A schematic diagram of the structure enlargement in the middle;

[0026] Figure 5 for Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0027] Figure 6 for Figure 3 A magnified schematic diagram of the structure at C in the middle;

[0028] Figure 7 for Figure 3 A magnified schematic diagram of the structure at D in the middle;

[0029] Figure 8 for Figure 3 The enlarged schematic diagram of the structure at E in the middle;

[0030] Fig. 9 for Figure 3 Enlarged schematic diagram of the structure at F in the middle.

[0031] In the figure: 1. tube body; 2. connecting tube; 3. protective sleeve; 4. first sliding groove; 5. sliding block; 6. needle; 7. second sliding groove; 8. first spring; 9. first movable rod; 10. second spring; 11. piston; 12. push rod; 13. third spring; 14. first square groove; 15. second square groove; 16. second movable rod; 17. opening groove; 18. fourth spring; 19. first extrusion rod; 20. third sliding groove; 21. fifth spring; 22. pressure rod; 23. third movable rod; 24. sixth spring; 25. circular plate; 26. fixed groove; 27. fixed block; 28. second extrusion rod; 29. ​​pressing plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] like Figure 1-Figure 9 As shown, the automatic syringe dosing device proposed by the present invention comprises a tube body 1, a first movable rod 9 is movably connected to the inner side of the tube body 1, a piston 11 is installed at the end of the first movable rod 9, a second spring 10 is fixedly installed between the piston 11 and the inner wall of the tube body 1, a sliding block 5 is slidably arranged on the inner side of the tube body 1, a needle 6 is installed at the end of the sliding block 5, a protective sleeve 3 is movably connected to the end of the tube body 1, and a push rod 12 is symmetrically movably connected to the end of the tube body 1, the first movable rod 9 drives the piston 11 to squeeze the push rod 12 after being pressed, the push rod 12 is squeezed by the piston 11 to move, and then squeezes the protective sleeve 3, so that the protective sleeve 3 is automatically separated from the tube body 1, and the medical staff does not need to manually remove the protective sleeve 3, which can ensure that the medical staff will not directly contact the exposed needle 6 when preparing for injection, thereby reducing the risk of needle stick injury;

[0035] The tube body 1 is provided with an automatic retraction assembly for the needle 6, which includes a second movable rod 16 and a first extrusion rod 19 which are respectively slidably arranged on the inner side of the tube body 1, and a pressure rod 22 which is installed at the end of the first extrusion rod 19. A return plate 25 is slidably arranged on the inner side of the tube body 1, and a second extrusion rod 28 is installed on the side of the return plate 25. A fixed block 27 is installed on the inner side of the return plate 25. A plurality of fixed grooves 26 are provided on the side of the first movable rod 9. When the return plate 25 is pressed, the fixed block 27 is driven to move to the outside of the fixed groove 26, thereby releasing the connection between the first movable rod 9 and the tube body 1, and continuing to press the return plate 25 , so that the second squeezing rod 28 squeezes the pressure-receiving rod 22. After the pressure-receiving rod 22 is squeezed, it drives the first squeezing rod 19 to move, so that the first squeezing rod 19 squeezes the second movable rod 16. After the second movable rod 16 is squeezed, it moves upward, and the limit between the second movable rod 16 and the sliding block 5 is released. The sliding block 5 drives the needle 6 to automatically retract into the inner side of the tube body 1. After the sliding block 5 moves, it no longer blocks the second movable rod 16. The second movable rod 16 moves downward, and the tube body 1 is automatically closed, which reduces the risk of medical staff or patients being injured due to accidentally touching the needle 6, and ensures that there will be no residual and overflow of liquid medicine after injection, so as to keep the medical environment clean.

[0036] A connecting tube 2 is installed at the end of the tube body 1. The connecting tube 2 is movably connected to the protective sleeve 3. The size of the opening of the protective sleeve 3 is adapted to the size of the connecting tube 2. The protective sleeve 3 is inserted into the connecting tube 2 to seal the needle 6.

[0037] The third spring 13 is installed at one end of the two push rods 12 extending to the inner side of the tube body 1. The end of the third spring 13 away from the piston 11 is fixedly connected to the inner wall of the tube body 1. The push rod 12 is moved by the compression of the piston 11 and then compresses the protective sleeve 3.

[0038] A first sliding groove 4 is provided inside the tube body 1, and a sliding block 5 is slidably arranged on the inner side of the first sliding groove 4. The size of the opening of the first sliding groove 4 is adapted to the size of the sliding block 5, and the sliding block 5 and the needle 6 are connected. A first square groove 14 is provided on the upper part of the sliding block 5, and a second sliding groove 7 is provided on the inner side of the first sliding groove 4. A first spring 8 is installed on the inner side of the second sliding groove 7, and one end of the first spring 8 close to the needle 6 is fixedly connected to the sliding block 5, and the needle 6 is automatically retracted into the inner side of the tube body 1 by the sliding block 5 moving along the first sliding groove 4.

[0039] The tube body 1 is internally movably connected with a third movable rod 23, and one end of the third movable rod 23 extending to the outside of the tube body 1 is installed with a pressing plate 29, and the end of the third movable rod 23 away from the pressing plate 29 is fixedly connected to the circular plate 25, and a sixth spring 24 is installed between the circular plate 25 and the inner wall of the tube body 1. The expansion and contraction of the sixth spring 24 drives the fixed block 27 on the inner side of the circular plate 25 to always be inserted into the fixed groove 26 in the initial state.

[0040] The cross section of the fixing block 27 is trapezoidal, and a plurality of fixing grooves 26 are vertically and evenly distributed on the first movable rod 9 . The size of the opening of the fixing groove 26 matches the size of the fixing block 27 , thereby ensuring the stability of the fixing block 27 when inserted into the fixing groove 26 .

[0041] In this embodiment, when it is necessary to perform the injection and dosing work, the tube body 1 can be held by hand, and then the pressing plate 29 can be pressed. Pressing the pressing plate 29 can drive the third movable rod 23 to move, and at the same time drive the return plate 25 to move. At this time, the sixth spring 24 is stretched, and when the return plate 25 moves, it can drive the fixing groove 26 to move to the outside of the fixing block 27. At this time, the connection between the first movable rod 9 and the tube body 1 can be released, and then the first movable rod 9 is pressed, and at the same time, the piston 11 is driven to move in the direction close to the needle 6. When the piston 11 moves, it can squeeze the push rod 12. At this time, the third spring 13 contracts, and the push rod 12 can move in the direction close to the protective cover 3 after being squeezed, and then the protective cover 3 is squeezed until the protective cover 3 automatically pops out and separates from the connecting tube 2. There is no need for medical staff to manually remove the protective cover 3, which can ensure that the medical staff will not directly contact the exposed needle 6 when preparing for injection, thereby reducing the risk of needle stick injury, and can also avoid the medical staff from causing contamination to the exposed needle 6 when the aseptic operation is not standardized;

[0042] Then the first movable rod 9 can be pulled, thereby driving the piston 11 to move away from the needle 6 to extract the liquid medicine, and at the same time driving the second spring 10 to contract, and when the first movable rod 9 moves, the first movable rod 9 squeezes the inclined surface of the fixed block 27, so that the fixed groove 26 will not be inserted into the fixed groove 26, and the sixth spring 24 is stretched. When the liquid extraction work is completed, the first movable rod 9 is stopped, and the sixth spring 24 in the stretched state is reset, thereby driving the fixed block 27 to be inserted into the fixed groove 26 through the circular plate 25, limiting the first movable rod 9 and the piston 11, and keeping the piston 11 in a contracted state to achieve the state ready for injection.

[0043] Embodiment 2

[0044] like Figure 1-Figure 9 As shown, based on the first embodiment, a second square groove 15 is opened inside the tube body 1, and a second movable rod 16 is slidably arranged on the inner side of the second square groove 15. The size of the opening of the first square groove 14 is adapted to the size of the second movable rod 16. A fourth spring 18 is installed on the upper part of the second movable rod 16, and one end of the fourth spring 18 away from the second movable rod 16 is fixedly connected to the inner wall of the second square groove 15. An opening groove 17 is opened on the side of the second square groove 15, so that the second movable rod 16 can be moved to the outside of the first square groove 14 to release the limit on the sliding block 5.

[0045] A third sliding groove 20 is provided on the inner wall of the tube body 1, and the first extrusion rod 19 is slidably connected to the third sliding groove 20. The pressure rod 22 is installed on the side of the first extrusion rod 19 close to the circular plate 25. A fifth spring 21 is installed at the bottom of the first extrusion rod 19. The end of the fifth spring 21 away from the first extrusion rod 19 is fixedly connected to the tube body 1. When the first extrusion rod 19 moves, it squeezes the inclined part of the open groove 17, thereby driving the second movable rod 16 to move.

[0046] The cross section of the compression rod 22 is trapezoidal, and the compression rod 22 is located on the movement track of the second extrusion rod 28 . The second extrusion rod 28 compresses the inclined surface of the compression rod 22 to drive the compression rod 22 to move downward.

[0047] The width of the second movable rod 16 is equal to the width of the first sliding groove 4 , so as to ensure the closure of the tube body 1 .

[0048] In this embodiment, when an injection is required, the needle 6 can be inserted into the patient's body, and then the pressing plate 29 is pressed, which drives the third movable rod 23 and the return plate 25 to move. At this time, the sixth spring 24 is stretched, and when the return plate 25 moves, it can drive the fixed block 27 to move to the outside of the fixed groove 26. At this time, the connection between the first movable rod 9 and the tube body 1 can be released, and the second spring 10 in the contracted state is reset, thereby driving the piston 11 to advance. Through the advancement of the piston 11, the liquid medicine can enter the patient's body through the first sliding groove 4, the sliding block 5 and the needle 6. There is no need for the staff to manually press, and the automatic injection and dosing work is performed. When the dosing work is completed After that, the needle 6 is pulled out of the patient's body. At this time, the pressing plate 29 can be continued to be pressed, thereby driving the circular plate 25 to continue to move, and at the same time driving the second squeezing rod 28 to squeeze the inclined surface of the compressed rod 22, and at this time, the compressed rod 22 can be driven to move downward, and at the same time, the first squeezing rod 19 can be driven to move downward along the third sliding groove 20, and at this time, the fifth spring 21 contracts, and the first squeezing rod 19 can squeeze the inclined part of the opening groove 17 when moving, and at the same time, the force generated by the squeezing can drive the second movable rod 16 to move along the second square groove 15, and at this time, the fourth spring 18 in the contracted state continues to contract until the second movable rod 16 moves to the outside of the first square groove 14;

[0049] At this time, the limit of the sliding block 5 is released, and the first spring 8 in the stretched state is reset, which can drive the sliding block 5 to move along the second sliding groove 7, and at the same time drive the needle 6 to move, so that the needle 6 is retracted into the inner side of the first sliding groove 4. At this time, the pressing plate 29 is released, so that the second extrusion rod 28 no longer squeezes the pressure-receiving rod 22, and the fifth spring 21 in the contracted state is reset, thereby driving the first extrusion rod 19 to reset, so that the first extrusion rod 19 is no longer in contact with the second movable rod 16. At this time, the fourth spring 18 in the contracted state is reset, and at the same time drives the second movable rod 16 to move to the inner side of the first sliding groove 4, blocking the first sliding groove 4 to prevent the residual drug liquid in the tube body 1 from overflowing, thereby reducing the risk of medical staff or patients being injured due to accidentally touching the needle 6, especially when treating infectious patients. This is particularly important, and the first sliding groove 4 is automatically closed by the second movable rod 16 to ensure that there will be no residual and overflow of drug liquid after injection, so as to keep the medical environment clean.

[0050] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic syringe dosing device, comprising a tube body (1), characterized in that: The inner side of the tube body (1) is movably connected with a first movable rod (9), the end of which is provided with a piston (11), a second spring (10) is fixedly installed between the piston (11) and the inner wall of the tube body (1), a sliding block (5) is slidably provided on the inner side of the tube body (1), a needle (6) is installed at the end of the sliding block (5), the end of the tube body (1) is movably connected with a protective sleeve (3), the end of the tube body (1) is symmetrically movably connected with a push rod (12), the first movable rod (9) drives the piston (11) to squeeze the push rod (12) after being pressed, the push rod (12) is squeezed by the piston (11) to move, and then squeezes the protective sleeve (3), so that the protective sleeve (3) and the tube body (1) are automatically separated; The tube body (1) is provided with an automatic retracting assembly for the needle (6), the automatic retracting assembly comprising a second movable rod (16) and a first extrusion rod (19) respectively slidably arranged on the inner side of the tube body (1), and a pressure rod (22) installed at the end of the first extrusion rod (19); a return plate (25) is slidably arranged on the inner side of the tube body (1), a second extrusion rod (28) is installed on the side of the return plate (25), a fixed block (27) is installed on the inner side of the return plate (25), a plurality of fixed grooves (26) are opened on the side of the first movable rod (9), and the return plate (25) drives the fixed block (27) to move to the fixed groove (26) when being pressed. The outside of the first movable rod (9) and the tube body (1) are released from the connection, and the return plate (25) is continuously pressed, so that the second extrusion rod (28) squeezes the pressure-receiving rod (22). After the pressure-receiving rod (22) is squeezed, the first extrusion rod (19) is driven to move, so that the first extrusion rod (19) squeezes the second movable rod (16). After the second movable rod (16) is squeezed, it moves upward, and the limit between the second movable rod (16) and the sliding block (5) is released. The sliding block (5) drives the needle (6) to automatically retract into the inner side of the tube body (1). After the sliding block (5) moves, it no longer blocks the second movable rod (16). The second movable rod (16) moves downward, and the tube body (1) is automatically closed.

2. The automatic syringe dosing device according to claim 1, characterized in that: A connecting pipe (2) is installed at the end of the tube body (1); the connecting pipe (2) is movably connected to the protective sleeve (3); and the size of the opening of the protective sleeve (3) is adapted to the size of the connecting pipe (2).

3. The automatic syringe dosing device according to claim 2, characterized in that: A third spring (13) is installed at one end of the two push rods (12) extending to the inner side of the tube body (1), and the end of the third spring (13) away from the piston (11) is fixedly connected to the inner wall of the tube body (1).

4. The automatic syringe dosing device according to claim 1, characterized in that: The tube body (1) is provided with a first sliding groove (4) inside, and the sliding block (5) is slidably arranged on the inner side of the first sliding groove (4). The size of the opening of the first sliding groove (4) is adapted to the size of the sliding block (5). The sliding block (5) and the needle (6) are connected to each other. A first square groove (14) is provided on the upper part of the sliding block (5). A second sliding groove (7) is provided on the inner side of the first sliding groove (4). A first spring (8) is installed on the inner side of the second sliding groove (7). One end of the first spring (8) close to the needle (6) is fixedly connected to the sliding block (5).

5. The automatic syringe dosing device according to claim 4, characterized in that: A second square groove (15) is provided inside the tube body (1), and the second movable rod (16) is slidably arranged inside the second square groove (15). The size of the opening of the first square groove (14) is adapted to the size of the second movable rod (16). A fourth spring (18) is installed on the upper part of the second movable rod (16), and one end of the fourth spring (18) away from the second movable rod (16) is fixedly connected to the inner wall of the second square groove (15). An opening groove (17) is provided on the side of the second square groove (15).

6. The automatic syringe dosing device according to claim 1, characterized in that: The inner wall of the tube body (1) is provided with a third sliding groove (20), the first extrusion rod (19) is slidably connected to the third sliding groove (20), the pressure rod (22) is installed on the side of the first extrusion rod (19) close to the circular plate (25), and a fifth spring (21) is installed at the bottom of the first extrusion rod (19), and the end of the fifth spring (21) away from the first extrusion rod (19) is fixedly connected to the tube body (1).

7. The automatic syringe dosing device according to claim 6, characterized in that: The cross section of the compression rod (22) is trapezoidal, and the compression rod (22) is located on the movement track of the second extrusion rod (28).

8. The automatic syringe dosing device according to claim 1, characterized in that: A third movable rod (23) is movably connected inside the tube body (1); a pressing plate (29) is installed at one end of the third movable rod (23) extending to the outside of the tube body (1); an end of the third movable rod (23) away from the pressing plate (29) is fixedly connected to a circular plate (25); and a sixth spring (24) is installed between the circular plate (25) and the inner wall of the tube body (1).

9. The automatic syringe dosing device according to claim 1, characterized in that: The cross section of the fixing block (27) is trapezoidal, and the plurality of fixing grooves (26) are vertically and evenly distributed on the first movable rod (9), and the size of the opening of the fixing groove (26) is adapted to the size of the fixing block (27).

10. The automatic syringe dosing device according to claim 4, characterized in that: The width of the second movable rod (16) is equal to the width of the first sliding groove (4).

Images