Auto-injector dosing device

Abstract

The application discloses an automatic injector medicine adding device and relates to the technical field of medical devices, which comprises a tube body, characterized in that the inner side of the tube body is movably connected with a first movable rod, the end of the first movable rod is provided with a piston, the piston and the inner wall of the tube body are jointly and fixedly provided with a second spring, the inner side of the tube body is slidably provided with a sliding block, the end of the sliding block is provided with a needle, the end of the tube body is movably connected with a protective sleeve, the end of the tube body is movably connected with a top rod in a symmetrical manner, and the first movable rod drives the piston to extrude the top rod after being pressed. The top rod is arranged, the first movable rod drives the piston to extrude the top rod through pressing, the automatic ejection of the protective sleeve is realized, medical staff can not directly contact the exposed needle when the injection is prepared, the risk of needle stick injury is reduced, and the pollution of the needle caused by the non-standard sterile operation of the medical staff can be avoided.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to an automatic injector dispensing device. Background Technology

[0002] An autoinjector typically consists of a needle, syringe, piston, and pusher. The pusher provides the power for automatic injection, pushing the liquid in the syringe to deliver the medication. This allows healthcare professionals to administer the necessary medication to patients more quickly and accurately.

[0003] A search revealed that Chinese patent number CN118320229A discloses a novel automatic aspiration and injection syringe auxiliary device. Compared with existing technologies, this invention patent CN118320229A assists in the automatic aspiration and injection of syringes by setting up a barrel for mounting syringes, a drive mechanism that can drive the syringe to automatically complete the aspiration or injection action, and a control component for controlling the drive mechanism. This facilitates repetitive one-handed operation, improves injection efficiency, reduces operational errors, and lowers operational risks, which is of great significance for improving the performance and convenience of medical injection devices.

[0004] However, in actual use, the aforementioned device requires medical staff to manually remove the protective cap from the needle before injection. This process is prone to errors, leading to needlestick injuries. Furthermore, improper aseptic technique by medical staff can contaminate the exposed needle. After the injection is completed, medical staff need to manually remove the needle or re-cover the protective cap. Since the needle has been used, there may be drug residue, as well as patient blood and tissue fluid residue. The process of re-covering the protective cap can also cause needlestick injuries or cuts, leading to infection. Therefore, an automatic injector for drug dispensing is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as needles easily injuring medical personnel and improper aseptic techniques by medical personnel easily contaminating exposed needles, and to propose an automatic syringe for drug dispensing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automatic injector dispensing device includes 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. A push rod is symmetrically movably connected to the end of the tube body. When the first movable rod is pressed, it drives the piston to squeeze the push rod. The push rod moves under the pressure of the piston and then squeezes the protective sleeve, causing the protective sleeve to automatically separate from the tube body. This eliminates the need for medical personnel to manually remove the protective sleeve, ensuring that medical personnel will not directly contact the exposed needle when preparing for injection, thereby reducing the risk of needlestick injury.

[0008] The tube body is equipped with an automatic retraction assembly for the needle tip. The automatic retraction assembly includes a second movable rod and a first squeezing rod slidably disposed on the inner side of the tube body, and a pressure-receiving rod installed at the end of the first squeezing rod. A loop plate is slidably disposed on the inner side of the tube body. The second squeezing rod is installed on the side of the loop plate, and a fixing block is installed on the inner side of the loop plate. Multiple fixing grooves are formed on the side of the first movable rod. When the loop plate is pressed, it drives the fixing block to move to the outside of the fixing grooves, releasing the connection between the first movable rod and the tube body, and then continues to be pressed back. The forming plate causes the second extrusion rod to press against the pressure rod. After being compressed, the pressure rod drives the first extrusion rod to move, causing the first extrusion rod to press against the second movable rod. After being compressed, the second movable rod moves upward, releasing the limitation between the second movable rod and the sliding block. The sliding block drives the needle to automatically retract into the inside of the tube. After the sliding block moves, it no longer blocks the second movable rod, which moves downward, automatically sealing the tube. This reduces the risk of injury to medical staff or patients due to accidental needle contact and ensures that no medication residue or spillage occurs after injection, maintaining a clean medical environment.

[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 adapted to the size of the connecting tube. The needle is sealed by inserting the protective sleeve into the connecting tube.

[0011] Both of the push rods are equipped with a third spring at one end extending into the inner side of the tube. The end of the third spring away from the piston is fixedly connected to the inner wall of the tube. The push rod moves under the pressure of the piston and then compresses the protective sleeve.

[0012] The tube body has a first sliding groove inside, and the sliding block is slidably disposed inside the first sliding groove. The size of the opening of the first sliding groove is adapted to the size of the sliding block. The sliding block is in communication with the needle. The upper part of the sliding block has a first square groove. The inner side of the first sliding groove has a second sliding groove. The inner side of the second sliding groove is equipped with a first spring. The end of the first spring near the needle is fixedly connected to the sliding block. The needle is automatically retracted into the inner side of the tube body by the movement of the sliding block along the first sliding groove.

[0013] The tube body has a second square groove inside. The second movable rod is slidably disposed inside 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. 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 move to the outside of the first square groove to release the limitation on the sliding block.

[0014] The inner wall of the tube is provided with a third sliding groove. 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 near the U-shaped plate. A fifth spring is installed at the bottom of the first extrusion rod. The end of the fifth spring away from the first extrusion rod is fixedly connected to the tube. When the first extrusion rod moves, it extrudes the inclined part of the opening groove, which can drive the second movable rod to move.

[0015] The cross-section of the pressure rod is trapezoidal, and the pressure rod is located on the movement trajectory of the second extrusion rod. The pressure rod is driven to move downward by the second extrusion rod extruding the inclined surface of the pressure rod.

[0016] The tube body is internally connected to a third movable rod. 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 a U-shaped plate. A sixth spring is installed between the U-shaped plate and the inner wall of the tube body. The extension and retraction of the sixth spring causes the fixing block on the inner side of the U-shaped plate to be initially always inserted into the fixing groove.

[0017] The cross-section of the fixing block is trapezoidal, and multiple fixing slots are vertically and evenly distributed on the first movable rod. The size of the fixing slot opening is adapted to the size of the fixing block to ensure the stability of the fixing block when inserted into the fixing slot.

[0018] The width of the second movable rod is equal to the width of the first sliding groove to ensure the closure of the tube.

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

[0020] 1. In this invention, by setting a top rod, the piston can be driven to squeeze the top rod by pressing the first movable rod, so that the protective cover can be automatically popped out. There is no need for medical staff to manually remove the protective cover. This can ensure that medical staff will not directly contact the exposed needle when preparing for injection, thereby reducing the risk of needlestick injury. It can also avoid the contamination of the needle caused by medical staff's non-standard aseptic operation.

[0021] 2. In this invention, by setting an automatic retraction component, the tube can be automatically retracted into the tube after the injection is completed. At the same time, the tube can be automatically sealed by the second movable rod to prevent residual medicine from spilling out of the tube. This reduces the risk of injury to medical staff or patients due to accidental contact with the needle. This is especially important when dealing with infectious patients, ensuring that no medicine remains or spills after injection, thus maintaining the cleanliness of the medical environment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the automatic injector drug dispensing device proposed in this invention;

[0023] Figure 2 This is a schematic diagram of the overall end section structure in this invention;

[0024] Figure 3 This is a schematic side sectional view of the present invention;

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

[0026] Figure 5 for Figure 4 Enlarged schematic diagram of the structure at point B;

[0027] Figure 6 for Figure 3 Enlarged schematic diagram of the structure at point C;

[0028] Figure 7 for Figure 3 Enlarged schematic diagram of the structure at point D;

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

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

[0031] In the diagram: 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 pressing rod; 20. Third sliding groove; 21. Fifth spring; 22. Pressure rod; 23. Third movable rod; 24. Sixth spring; 25. U-shaped plate; 26. Fixed groove; 27. Fixed block; 28. Second pressing rod; 29. ​​Pressing plate. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figures 1-9 As shown, the automatic syringe dispensing device proposed in this invention includes 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. A push rod 12 is symmetrically movably connected to the end of the tube body 1. When the first movable rod 9 is pressed, it drives the piston 11 to squeeze the push rod 12. The push rod 12 moves under the squeeze of the piston 11 and then squeezes the protective sleeve 3, so that the protective sleeve 3 is automatically separated from the tube body 1. Medical personnel do not need to manually remove the protective sleeve 3. This ensures that medical personnel will not directly contact the exposed needle 6 when preparing for injection, thereby reducing the risk of needlestick injury.

[0035] The tube body 1 is equipped with an automatic retraction assembly for the needle 6. The automatic retraction assembly includes a second movable rod 16 and a first squeezing rod 19 slidably disposed on the inner side of the tube body 1, and a pressure rod 22 installed at the end of the first squeezing rod 19. A U-shaped plate 25 is slidably disposed on the inner side of the tube body 1. A second squeezing rod 28 is installed on the side of the U-shaped plate 25. A fixing block 27 is installed on the inner side of the U-shaped plate 25. Multiple fixing grooves 26 are opened on the side of the first movable rod 9. When the U-shaped plate 25 is pressed, it drives the fixing block 27 to move to the outside of the fixing groove 26, releasing the connection between the first movable rod 9 and the tube body 1. The U-shaped plate 25 is then pressed further. The second squeezing rod 28 squeezes the pressure rod 22. After being squeezed, the pressure rod 22 drives the first squeezing rod 19 to move, causing the first squeezing rod 19 to squeeze the second movable rod 16. After being squeezed, the second movable rod 16 moves upward, releasing the limitation between the second movable rod 16 and the sliding block 5. The sliding block 5 drives the needle 6 to automatically retract into the inside of the tube body 1. After the sliding block 5 moves, it no longer blocks the second movable rod 16, and the second movable rod 16 moves downward, automatically sealing the tube body 1. This reduces the risk of injury to medical staff or patients due to accidental contact with the needle 6, and ensures that there is no drug residue or spillage after injection, thus maintaining the cleanliness of the medical environment.

[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 needle 6 is sealed by inserting the protective sleeve 3 into the connecting tube 2.

[0037] Two push rods 12 are each equipped with a third spring 13 at one end extending into 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 rods 12 are moved by the pressure of the piston 11 and then press the protective sleeve 3.

[0038] The tube body 1 has a first sliding groove 4 inside. A sliding block 5 is slidably disposed inside 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 is connected to the needle 6. A first square groove 14 is provided on the upper part of the sliding block 5. A second sliding groove 7 is provided inside the first sliding groove 4. A first spring 8 is installed inside the second sliding groove 7. The end of the first spring 8 near the needle 6 is fixedly connected to the sliding block 5. The needle 6 is automatically retracted into the inside of the tube body 1 by the movement of the sliding block 5 along the first sliding groove 4.

[0039] The tube body 1 is internally connected to a third movable rod 23. A pressing plate 29 is installed at one end of the third movable rod 23 extending to the outside of the tube body 1. The end of the third movable rod 23 away from the pressing plate 29 is fixedly connected to the U-shaped plate 25. A sixth spring 24 is installed between the U-shaped plate 25 and the inner wall of the tube body 1. The extension and retraction of the sixth spring 24 causes the fixing block 27 on the inner side of the U-shaped plate 25 to be initially always inserted into the fixing groove 26.

[0040] The cross-section of the fixing block 27 is trapezoidal, and multiple fixing grooves 26 are vertically and evenly distributed on the first movable rod 9. The size of the opening of the fixing groove 26 is adapted to the size of the fixing block 27 to ensure the stability of the fixing block 27 inserted into the fixing groove 26.

[0041] In this embodiment, when injection is required, the tube body 1 can be held and the pressing plate 29 can be pressed. Pressing the pressing plate 29 will move the third movable rod 23 and the U-shaped plate 25. At this time, the sixth spring 24 will be stretched. When the U-shaped plate 25 moves, it will move the fixing groove 26 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. Then, the first movable rod 9 can be pressed, and the piston 11 will move closer to the needle 6. When the piston 11 moves, it will squeeze the top rod 12. At this time, the third spring 13 will contract. After the top rod 12 is squeezed, it will move closer to the protective sleeve 3 and squeeze the protective sleeve 3 until the protective sleeve 3 automatically pops out and separates from the connecting tube 2. The medical staff does not need to manually remove the protective sleeve 3. This 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 preventing the exposed needle 6 from being contaminated when the medical staff does not perform aseptic operation in a standardized manner.

[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. At the same time, the second spring 10 is driven to contract. When the first movable rod 9 moves, it presses the inclined surface of the fixing block 27, preventing the fixing groove 26 from being inserted into the fixing groove 26. At this time, the sixth spring 24 is stretched. When the liquid extraction is completed, the first movable rod 9 is stopped, and the sixth spring 24, which is in a stretched state, returns to its original position. This causes the fixing block 27 to be inserted into the fixing groove 26 through the U-shaped plate 25, limiting the first movable rod 9 and the piston 11 and keeping the piston 11 in a contracted state, thus achieving the state ready for injection.

[0043] Example 2

[0044] like Figures 1-9 As shown, based on Embodiment 1, a second square groove 15 is provided inside the tube body 1, and a second movable rod 16 is slidably disposed 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. The 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, so that the second movable rod 16 can move to the outside of the first square groove 14 to release the limitation on the sliding block 5.

[0045] 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 near the U-shaped 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 extrudes the inclined part of the opening groove 17, which can drive the second movable rod 16 to move.

[0046] The cross section of the pressure rod 22 is trapezoidal, and the pressure rod 22 is located on the movement trajectory of the second extrusion rod 28. The pressure rod 22 is moved downward by the second extrusion rod 28 extruding the inclined surface of the pressure rod 22.

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

[0048] In this embodiment, when injection is required, the needle 6 can be inserted into the patient's body, and then the pressing plate 29 is pressed, simultaneously moving the third movable rod 23 and the return plate 25. At this time, the sixth spring 24 is stretched, and when the return plate 25 moves, it can move the fixing block 27 to the outside of the fixing 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, which is in a contracted state, will reset, thereby driving the piston 11 to advance. The advancement of the piston 11 allows the liquid medicine to enter the patient's body through the first sliding groove 4, the sliding block 5, and the needle 6. The injection and medication dispensing work is automatic without the need for manual pressing by the staff. After the medication dispensing work is completed... Afterwards, the needle 6 is pulled out to the outside of the patient's body. At this time, the pressing plate 29 can be pressed to drive the circular plate 25 to continue moving. At the same time, the second pressing rod 28 is driven to press the inclined surface of the pressing rod 22. At this time, the pressing rod 22 can be driven to move down, and the first pressing rod 19 is driven to move down along the third sliding groove 20. At this time, the fifth spring 21 is contracted. When the first pressing rod 19 moves, it can press the inclined part of the opening groove 17. At the same time, the force generated by the compression can drive the second movable rod 16 to move along the second square groove 15. At this time, the fourth spring 18, which is in a contracted state, continues to contract until the second movable rod 16 moves to the outside of the first square groove 14.

[0049] At this point, the limiting position on the sliding block 5 is released, and the first spring 8, which is in a stretched state, resets, causing the sliding block 5 to move along the second sliding groove 7. Simultaneously, it moves the needle 6, causing it to retract into the inner side of the first sliding groove 4. Then, the pressing plate 29 is released, preventing the second squeezing rod 28 from squeezing the pressure rod 22. The fifth spring 21, which is in a contracted state, resets, thereby causing the first squeezing rod 19 to reset, preventing it from contacting the second movable rod 16. The fourth spring 18, which is in a contracted state, resets, simultaneously moving the second movable rod 16 to the inner side of the first sliding groove 4, blocking it and preventing residual medication from overflowing from the tube 1. This reduces the risk of injury to medical staff or patients due to accidental contact with the needle 6, especially important when dealing with infectious patients. Furthermore, the second movable rod 16 automatically seals the first sliding groove 4, ensuring no medication residue or overflow after injection, maintaining a clean medical environment.

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

Claims

1. Auto-injector dosing device comprising a tube (1), characterized in that, The inner side of the pipe body (1) is movably connected with a first movable rod (9), the end of the first movable rod (9) is provided with a piston (11), the piston (11) and the inner wall of the pipe body (1) are jointly fixedly provided with a second spring (10), the inner side of the pipe body (1) is slidably provided with a sliding block (5), the end of the sliding block (5) is provided with a needle (6), the end of the pipe body (1) is movably connected with a protective sleeve (3), the end of the pipe body (1) is symmetrically movably connected with a top rod (12), the first movable rod (9) is pressed to drive the piston (11) to extrude the top rod (12), the top rod (12) is extruded by the piston (11) to move, then extrude the protective sleeve (3), so that the protective sleeve (3) is automatically separated from the pipe body (1). The pipe body (1) is provided with an automatic retracting assembly for the needle (6), the automatic retracting assembly comprises a second movable rod (16) and a first extruding rod (19) which are slidably arranged inside the pipe body (1) respectively, a pressure rod (22) is mounted at the end of the first extruding rod (19), a meandering plate (25) is slidably arranged inside the pipe body (1), a second extruding rod (28) is mounted on the side of the meandering plate (25), a fixed block (27) is mounted inside the meandering plate (25), a plurality of fixed grooves (26) are formed in the side of the first movable rod (9), after the meandering plate (25) is pressed, the fixed block (27) is moved to the outside of the fixed grooves (26), the connection between the first movable rod (9) and the pipe body (1) is released, the meandering plate (25) is continuously pressed, the second extruding rod (28) extrudes the pressure rod (22), after the pressure rod (22) is extruded, the first extruding rod (19) is displaced, the first extruding rod (19) extrudes the second movable rod (16), after the second movable rod (16) is extruded, it is moved upwards, the limitation 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 inside of the pipe body (1), after the sliding block (5) moves, it no longer blocks the second movable rod (16), the second movable rod (16) is moved downwards, the pipe body (1) is automatically closed, one end of each of the two jacks (12) extending to the inside of the pipe body (1) is provided with a third spring (13), the end of the third spring (13) away from the piston (11) is fixedly connected with the inner wall of the pipe body (1), a first sliding groove (4) is formed in the inside of the pipe body (1), the sliding block (5) is slidably arranged in the inside of the first sliding groove (4), a first square groove (14) is formed in the upper portion of the sliding block (5), a second sliding groove (7) is formed in the inside of the first sliding groove (4), a first spring (8) is mounted in the inside of the second sliding groove (7), the end of the first spring (8) close to the needle (6) is fixedly connected with the sliding block (5), a fourth spring (18) is mounted on the upper portion of the second movable rod (16), the end of the fourth spring (18) away from the second movable rod (16) is fixedly connected with the inner wall of the second square groove (15), a third movable rod (23) is movably connected in the inside of the pipe body (1), one end of the third movable rod (23) extending to the outside of the pipe body (1) is provided with a pressing plate (29), the end of the third movable rod (23) away from the pressing plate (29) is fixedly connected with the meandering plate (25), the meandering plate (25) and the inner wall of the pipe body (1) are jointly provided with a sixth spring (24).

2. The auto-injector dosing device of claim 1, wherein, The end of the pipe body (1) is provided with a connecting pipe (2), the connecting pipe (2) is movably connected with a protective sleeve (3), the size of the opening of the protective sleeve (3) is matched with the size of the connecting pipe (2).

3. The auto-injector dosing device of claim 1, wherein, The size of the opening of the first sliding groove (4) is matched with the size of the sliding block (5), the sliding block (5) is in communication with the needle (6).

4. The auto-injector dosing device of claim 3, wherein, The inside of the pipe body (1) is provided with a second square groove (15), the second movable rod (16) is slidably arranged inside the second square groove (15), the opening size of the first square groove (14) is matched with the size of the second movable rod (16), and the side of the second square groove (15) is provided with an opening groove (17).

5. The auto-injector dosing device of claim 1, wherein, The inner wall of the pipe body (1) is provided with a third sliding groove (20), the first extrusion rod (19) is slidably connected with the third sliding groove (20), the pressure receiving rod (22) is installed on one side of the first extrusion rod (19) close to the meander plate (25), the bottom of the first extrusion rod (19) is provided with a fifth spring (21), and one end of the fifth spring (21) away from the first extrusion rod (19) is fixedly connected with the pipe body (1).

6. The auto-injector dosing device of claim 5, wherein, The section of the pressure receiving rod (22) is trapezoidal, and the pressure receiving rod (22) is above the movement track of the second extrusion rod (28).

7. The auto-injector dosing device of claim 1, wherein, The section of the fixed block (27) is trapezoidal, a plurality of fixed grooves (26) are vertically and uniformly distributed on the first movable rod (9), and the opening size of the fixed groove (26) is matched with the size of the fixed block (27).

8. The auto-injector dosing device of claim 4, wherein, The width of the second movable rod (16) is equal to the width of the first sliding groove (4).

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