Drug delivery device with stable structure

Abstract

The invention relates to the technical field of biomedicine, and discloses a drug delivery device with a stable structure. Comprising a fixing shell, the fixing shell is detachably connected with a transparent cover, the fixing shell and the transparent cover are jointly and detachably connected with a connecting shell, the connecting shell is detachably connected with a pen cap, a liquid storage shell is fixedly connected into the fixing shell, the liquid storage shell is fixedly connected with a fixing frame located in the fixing shell, and the fixing frame is slidably connected with a sliding frame; the liquid storage shell and the sliding frame are jointly connected with a first L-shaped rod in a sliding mode, and a tension spring is fixedly connected between the sliding frame and the first L-shaped rod. An intermittent driving mechanism with structural stability is provided, when the dosage of a patient needs to be adjusted, the tension spring is stretched in the moving process of the sliding frame, after the injection stroke is finished, the tension spring releases tension and recovers to the stress-free natural state, the working mode that an elastic element is started immediately after being used and returns to zero after being used is achieved through the design, and the working efficiency is improved. And the service time of the fabric is prolonged.

Description

Technical Field

[0001] This invention relates to the field of biomedical technology, specifically a drug delivery device with a stable structure. Background Technology

[0002] Insulin pens, as portable subcutaneous injection devices, are widely used in the daily insulin therapy of diabetic patients. In existing mechanical insulin pens, the injection action mostly relies on an internal spring (usually a compression spring) to provide propulsion, pushing the cartridge piston to deliver insulin. Specifically, the user sets the desired dose by rotating the dose selection knob. This process simultaneously pre-compresses and stores energy in the internal spring. When the injection button is pressed, the locking mechanism releases, the spring rebounds, and the plunger moves forward to achieve drug injection. However, this traditional design has significant drawbacks: In existing mechanical drug delivery devices, the compression springs are compressed as soon as the device is assembled. Even if no dosage is set or injection is performed, the springs still bear the preload for a long time. Although this design is simple, it is prone to material stress relaxation during long-term storage or high-temperature environments, which leads to a decrease in output thrust, affects the accuracy of drug delivery, and may even cause injection failure. Summary of the Invention

[0003] To address the problems mentioned in the background section, the present invention provides a drug delivery device with a stable structure.

[0004] The technical solution of the present invention is as follows: a drug delivery device with a stable structure, comprising a fixed shell, a transparent cover detachably connected to the fixed shell, a connecting shell detachably connected to the fixed shell and the transparent cover, a pen cap detachably connected to the connecting shell, a drug storage shell detachably connected inside the connecting shell, a squeeze plug slidably connected inside the drug storage shell, a drug delivery head detachably connected to the side of the drug storage shell away from the fixed shell, a liquid storage shell fixedly connected inside the fixed shell, a fixed frame fixedly connected to the liquid storage shell located inside the fixed shell, a sliding frame slidably connected to the fixed frame, a first L-shaped rod slidably connected to the liquid storage shell and the sliding frame, a tension spring fixedly connected between the sliding frame and the first L-shaped rod, and a limiting component for limiting the first L-shaped rod being provided inside the liquid storage shell.

[0005] Furthermore, the first L-shaped rod is detachably connected to a blocking block, which is used to block the travel direction of the sliding frame.

[0006] Furthermore, the limiting component includes a second L-shaped rod, which is slidably and sealingly connected to the liquid storage shell. The second L-shaped rod is fixedly connected to the first L-shaped rod. The second L-shaped rod is used to push the squeeze plug. A fixing plate is fixedly connected to the side of the second L-shaped rod located inside the liquid storage shell and close to the sliding frame. The fixing plate is slidably and sealingly connected to the liquid storage shell. A third L-shaped rod is rotatably and slidingly connected to the second L-shaped rod on the side of the liquid storage shell close to the sliding frame. A blocking plate is rotatably and sealingly connected to the third L-shaped rod on the side of the fixing plate away from the second L-shaped rod. Both the blocking plate and the fixing plate are provided with interconnected through holes. The blocking plate is used to block the through holes on the fixing plate.

[0007] Furthermore, a knob is rotatably connected to the side of the fixed shell near the fixed plate, and a fourth L-shaped rod is fixedly connected to the side of the knob near the fixed shell. A rotating column that is slidably connected to the fourth L-shaped rod is rotatably connected to the side of the third L-shaped rod near the sliding frame.

[0008] Furthermore, the knob is slidably connected to a sliding block, and a torsion spring is fixedly connected between the knob and the fixed shell. A recess is provided on the side of the fixed shell near the knob, and a first magnet is fixedly connected in the recess. The first magnet is used to attract the sliding block.

[0009] Furthermore, the fixing frame is slidably connected to a second magnet, which is used to attract the sliding block.

[0010] Furthermore, the attraction force of the second magnet is greater than that of the first magnet.

[0011] Furthermore, a connecting rope is fixedly connected inside the fixed frame. The connecting rope slides along the side of the fixed frame near the sliding frame. The side of the connecting rope near the sliding frame is fixedly connected to the second magnet. An elastic element is fixedly connected between the connecting rope and the fixed frame. A swing block for squeezing the connecting rope is rotatably connected to the side of the first L-shaped rod near the sliding frame. An elastic plate is fixedly connected to the side of the first L-shaped rod near the sliding frame. Both the elastic plate and the sliding frame are used to squeeze the swing block.

[0012] Furthermore, a rotating cylinder is rotatably connected to the fixed housing, and the rotating cylinder is provided with a threaded groove. The threaded groove is used to drive the sliding frame to move within the fixed housing. A fixing ring is rotatably connected to the side of the fixed housing near the knob, and a connecting block is fixed between the fixing ring and the rotating cylinder.

[0013] Furthermore, the fixed shell has a scale on the side near the knob, and the outer side of the connecting block has an indicator arrow that corresponds to the scale on the fixed shell.

[0014] The beneficial effects of this invention are as follows: This invention aims to overcome the defects in the prior art caused by the long-term compression and energy storage state of the drive spring, such as stress relaxation, elastic decay, and unstable drug delivery. It provides an intermittent drive mechanism with structural stability. When it is necessary to adjust the dosage for the patient, the tension spring is stretched during the movement of the sliding frame. After the dosage adjustment is completed, the first L-shaped rod squeezes the compression plug under the action of the tension spring, causing the drug liquid in the storage shell to flow out, thereby completing the drug delivery process. After the injection stroke is completed, the tension spring immediately releases the tension and returns to a stress-free natural state. This design realizes the "use-as-you-go, reset-to-zero" working mode of the elastic element, extending the service life of this invention. The blocking block blocks the movement distance of the sliding frame, limiting the maximum movement distance of the sliding frame and the maximum dose of a single injection, preventing patients from overdosing and ensuring treatment compliance. The first magnet attracts the sliding block to lock the knob, preventing accidental touch by the user. After the drug liquid is injected, the second magnet attracts the sliding block, allowing the blocking plate and the knob to automatically reset, lowering the usage threshold of this invention. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded view of the three-dimensional structure of the pen cap of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the connecting shell of the present invention; Figure 4 This is an exploded view of the three-dimensional structure of the transparent cover of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the liquid storage shell of the present invention; Figure 6 This is a three-dimensional structural cross-sectional view of the rotating cylinder of the present invention; Figure 7 This is a three-dimensional structural cross-sectional view of the knob of the present invention; Figure 8 This is a three-dimensional structural cross-sectional view of the first L-shaped rod of the present invention; Figure 9 This is an exploded view of the three-dimensional structure of the third L-shaped rod and the blocking plate of the present invention; Figure 10 Exploded three-dimensional view of the rotating cylinder, connecting block and fixing ring of the present invention.

[0016] Reference numerals: 1. Fixed shell, 2. Transparent cover, 3. Pen cap, 4. Connecting shell, 5. Dispensing head, 6. Drug storage shell, 7. Squeezable plug, 10. Liquid storage shell, 11. Fixed frame, 12. Sliding frame, 13. First L-shaped rod, 14. Blocking block, 15. Second L-shaped rod, 16. Fixed plate, 17. Third L-shaped rod, 18. Blocking plate, 19. Knob, 20. Fourth L-shaped rod, 21. Rotating column, 22. Sliding block, 23. First magnet, 24. Second magnet, 25. Connecting rope, 26. Swinging block, 27. Elastic plate, 30. Rotating cylinder, 31. Connecting block, 32. Fixed ring. Detailed Implementation

[0017] The present invention will be further described below with reference to specific embodiments. It should also be noted that, unless otherwise explicitly specified and limited, terms such as "set," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0018] This invention provides a novel driving mechanism in which the tension spring on the sliding frame 12 is completely released from stress in the non-working state and is only activated and performs work during the injection process, thereby eliminating the reliability risks caused by the long-term energy storage of existing springs. For details, please refer to the following:

[0019] Example 1: A drug delivery device with a stable structure, referenced Figure 1 Figure 8 shows a fixed shell 1, a transparent cover 2 detachably connected to the fixed shell 1, a connecting shell 4 detachably connected to both the fixed shell 1 and the transparent cover 2, a pen cap 3 detachably connected to the connecting shell 4, a drug storage shell 6 detachably connected inside the connecting shell 4, a squeeze plug 7 slidably connected inside the drug storage shell 6, a drug delivery head 5 detachably connected to the side of the drug storage shell 6 away from the fixed shell 1, a liquid storage shell 10 fixedly connected inside the fixed shell 1, a fixed frame 11 fixedly connected to the liquid storage shell 10 located inside the fixed shell 1, a sliding frame 12 slidably connected to the fixed frame 11, a first L-shaped rod 13 slidably connected to both the liquid storage shell 10 and the sliding frame 12, a tension spring fixedly connected between the sliding frame 12 and the first L-shaped rod 13, and a limiting component for limiting the first L-shaped rod 13 provided inside the liquid storage shell 10.

[0020] In the above scheme, when it is necessary to adjust the patient's medication dosage, the tension spring is only stretched during the movement of the sliding frame 12; after the medication dosage is adjusted, the tension spring releases its stored energy, pushes the first L-shaped rod 13 to move, and then squeezes the squeeze plug 7, so that the liquid medicine in the cavity of the drug storage shell 6 is discharged, realizing the administration of the drug. At the same time as the injection stroke ends, the tension spring completely releases its tension and returns to a stress-free natural state. This design realizes the working mode of "starting when used and returning to zero after use" of the elastic element, thereby increasing the service life of the invention.

[0021] refer to Figure 5 - In Figure 8, the first L-shaped rod 13 is detachably connected to a blocking block 14, which is used to block the travel direction of the sliding frame 12.

[0022] In the above scheme, the position of the blocking block 14 on the first L-shaped rod 13 can be adjusted according to the actual situation to limit the dosage of a single administration.

[0023] refer to Figure 1 - Figure 8 shows that the limiting assembly includes a second L-shaped rod 15, which is slidably and sealed to the liquid storage shell 10. The second L-shaped rod 15 is fixedly connected to the first L-shaped rod 13. The second L-shaped rod 15 is used to push the squeeze plug 7. A fixing plate 16 is fixedly connected to the side of the second L-shaped rod 15 located inside the liquid storage shell 10 and close to the sliding frame 12. The fixing plate 16 is slidably and sealed to the liquid storage shell 10. A third L-shaped rod 17 is rotatably and slidably connected to the second L-shaped rod 15 on the side of the liquid storage shell 10 close to the sliding frame 12. A blocking plate 18 is spline-connected to the third L-shaped rod 17 on the side of the fixing plate 16 away from the second L-shaped rod 15. Both the blocking plate 18 and the fixing plate 16 are provided with interconnected through holes. The blocking plate 18 is used to block the through holes on the fixing plate 16.

[0024] In the above scheme, the liquid reservoir 10 stores liquid. During the dosage adjustment process, the baffle plate 18 blocks the through hole on the fixing plate 16 to block the drive path and prevent premature injection due to misoperation. When the drug needs to be injected, the through hole on the baffle plate 18 and the fixing plate 16 are connected to each other to release the locking of the baffle plate 18 and the second L-shaped rod 15, so that the baffle plate 18 and the fixing plate 16 can slide in the liquid reservoir 10, thereby keeping the drug administration process smooth.

[0025] refer to Figures 4-10A knob 19 is rotatably connected to the side of the fixed shell 1 near the fixed plate 16. A fourth L-shaped rod 20 is fixedly connected to the side of the knob 19 near the fixed shell 1. A rotating column 21 that is slidably connected to the third L-shaped rod 17 near the sliding frame 12 is rotatably connected to the side of the third L-shaped rod 17. A rotating cylinder 30 is rotatably connected inside the fixed shell 1. The rotating cylinder 30 is provided with a threaded groove, which is used to drive the sliding frame 12 to move inside the fixed shell 1. A fixing ring 32 is rotatably connected to the side of the fixed shell 1 near the knob 19. A connecting block 31 is fixedly connected between the fixing ring 32 and the rotating cylinder 30.

[0026] In the above scheme, the connection position between the fourth L-shaped rod 20 and the knob 19 is located at the center of the inner side of the knob 19. There is resistance between the fixed shell 1 and the rotating cylinder 30. An arc-shaped groove is provided on the right side of the fixed shell 1. The connecting block 31 slides along the arc-shaped groove. The arc-shaped groove provides fixation between the rotating cylinder 30 and the fixed ring 32. Thus, when the fixed ring 32 rotates, it drives the rotating cylinder 30 to rotate inside the fixed shell 1 through the connecting block 31. The threaded groove on the rotating cylinder 30 squeezes the sliding frame 12, causing the sliding frame 12 to translate along the fixed frame 11 and the liquid storage shell 10. The threaded groove on the rotating cylinder 30 limits the sliding frame 12, realizing the self-locking of the sliding frame 12 after it moves.

[0027] refer to Figure 4 The fixed housing 1 has a scale on the side near the knob 19, and the outer side of the connecting block 31 has an indicator arrow that corresponds to the scale on the fixed housing 1.

[0028] In the above scheme, the outer indicator arrow of the connecting block 31 is matched with the scale on the right side of the fixed shell 1 so that the user can understand the dosage of the drug for this administration.

[0029] Working principle: When using this device, the user first removes the pen cap 3 to expose the drug delivery head 5. Then, the user rotates the fixing ring 32, which drives the rotating cylinder 30 to rotate through the connecting block 31. The rotating cylinder 30 drives the sliding frame 12 to slide to the left along the fixing frame 11 and the liquid storage shell 10 through its threaded groove. During the movement of the sliding frame 12, the tension spring is pulled, keeping the tension spring in a stretched state. At the same time, the blocking block 14 blocks the distance that the sliding frame 12 moves to the left, thereby limiting the maximum movement distance of the sliding frame 12 and limiting the maximum dose of a single injection, preventing patients from overdosing and ensuring the compliance of treatment.

[0030] Once the sliding frame 12 has traveled the required distance for a single injection, the user can loosen the retaining ring 32. At this point, the sliding frame 12 is locked in place by the threaded groove on the rotating cylinder 30, thus restricting its movement. The user then rotates the knob 19, which in turn drives the fourth L-shaped rod 20 to rotate the rotating column 21. The rotating column 21 then drives the third L-shaped rod 17 to rotate synchronously. As these components rotate, the fourth L-shaped rod 20 and the rotating column 21 experience relative displacement, and the third L-shaped rod 17 rotates... During the process, the blocking plate 18 is rotated, so that the blocking plate 18 no longer blocks the through hole on the fixed plate 16. At that time, the through hole on the blocking plate 18 and the fixed plate 16 are connected. Under the action of the tension spring provided by the sliding frame 12, the first L-shaped rod 13 drives the blocking block 14, the second L-shaped rod 15, the fixed plate 16 and the blocking plate 18 (the blocking plate 18 slides along the third L-shaped rod 17) to move to the left. During the movement of the second L-shaped rod 15, the squeezing plug 7 is squeezed, so that the medicine in the medicine storage shell 6 flows into the user's body through the drug delivery head 5.

[0031] When the first L-shaped rod 13 slides to its right side and fits against the sliding frame 12 and the tension of the spring is released, the drug administration is completed. This design realizes the "use-as-you-go, reset-to-zero" working mode of the elastic element, thereby increasing the service life of the invention.

[0032] After the medication is administered, the user rotates the knob 19 in the opposite direction. The knob 19 drives the rotating column 21 to move in the opposite direction via the fourth L-shaped rod 20. The rotating column 21 drives the third L-shaped rod 17 to rotate in the opposite direction. The third L-shaped rod 17 then drives the blocking plate 18 to rotate in the opposite direction, restoring the blocking plate 18's obstruction of the through hole of the fixing plate 16. When the device needs to be used again, the above process can be repeated.

[0033] Example 2: Based on Example 1, refer to Figures 5-8 The knob 19 is slidably connected to the sliding block 22. A torsion spring is fixed between the knob 19 and the fixed shell 1. A recess is provided on the side of the fixed shell 1 near the fixed plate 16. A first magnet 23 is fixed in the recess. The first magnet 23 is used to attract the sliding block 22. A second magnet 24 is slidably connected to the fixed frame 11. The second magnet 24 is used to attract the sliding block 22. The attraction force of the second magnet 24 is greater than that of the first magnet 23.

[0034] In the above scheme, when the sliding block 22 is inserted into the recess of the fixed shell 1, it limits the knob 19. The sliding block 22 is made of a material that can be attracted by the second magnet 24 or the first magnet 23.

[0035] refer to Figure 6- As shown in Figure 8, a connecting rope 25 is fixedly connected inside the fixed frame 11. The connecting rope 25 slides along the side of the fixed frame 11 near the sliding frame 12. The side of the connecting rope 25 near the sliding frame 12 is fixedly connected to the second magnet 24. An elastic element is fixedly connected between the connecting rope 25 and the fixed frame 11. A swing block 26 for squeezing the connecting rope 25 is rotatably connected to the side of the first L-shaped rod 13 near the sliding frame 12. An elastic plate 27 is fixedly connected to the side of the first L-shaped rod 13 near the sliding frame 12. Both the elastic plate 27 and the sliding frame 12 are used to squeeze the swing block 26. When the swing block 26 does not squeeze the connecting rope 25, the elastic plate 27 has elasticity.

[0036] In the above scheme, the elastic element between the connecting rope 25 and the fixing frame 11 is a spring. The elastic force provided by the elastic plate 27 is greater than the elastic force provided by the spring. The left end of the connecting rope 25 is fixed to the fixing frame 11, and the right end is slidably connected to the fixing frame 11. After the connecting rope 25 is squeezed by the swing block 26, it contracts and squeezes the elastic element, causing the second magnet 24 to move to the left. After the drug administration is completed, the connecting rope 25 drives the second magnet 24 to reset under the action of the elastic element, so that the second magnet 24 attracts the sliding block 22, thereby releasing the limit on the knob 19, so that the knob 19 can be reset by the torque generated by the torsion spring.

[0037] Working principle: During the movement of the sliding frame 12, the tension spring is stretched and the squeezing force on the swing block 26 is reduced, so that the swing block 26 rotates clockwise under the action of the elastic plate 27. During the rotation of the swing block 26, the connecting rope 25 is squeezed, causing the connecting rope 25 to contract and pull the second magnet 24 (the elastic element is squeezed during the contraction of the connecting rope 25, and the elastic element stores force).

[0038] After the dosage is adjusted, the sliding frame 12 stops moving. At this time, the user turns the knob 19, which drives the sliding block 22 to rotate in the direction of the first magnet 23 (the torsion spring stores energy during the rotation of the knob 19). When the knob 19 is rotated to the point where the through hole on the blocking plate 18 and the through hole on the fixing plate 16 are connected, the sliding block 22 is attracted by the first magnet 23 and slides into the recess of the fixing shell 1, thereby locking the knob 19 and preventing the user from accidentally touching it. As the medicine is injected, the first L-shaped rod 13 drives the swing block 26 to move closer to the sliding frame 12. When the swing block 26 contacts the sliding frame 12, the swing block 26 is squeezed by the sliding frame 12 and rotates counterclockwise to reset (the swing block 26 squeezes the elastic plate 27 during the reset process), thereby gradually losing the squeeze on the connecting rope 25. The connecting rope 25 moves to the right and resets under the action of the elastic element.

[0039] When the sliding frame 12 contacts the first L-shaped rod 13, the connecting rope 25 is in its initial state (i.e., the state when it is not squeezed). At this time, the second magnet 24 is located below the sliding block 22. Under the attraction of the second magnet 24, the sliding block 22 moves downward and disengages from the first magnet 23 and the right recess of the fixed shell 1. Under the action of the adjacent torsion spring of the blocking plate 18, the blocking plate 18 drives the fourth L-shaped rod 20 and its auxiliary parts to rotate and reset. Through the above working principle, the blocking plate 18 and the knob 19 can automatically reset after the injection is completed, reducing the usage threshold of the present invention.

[0040] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A drug delivery device having a stable structure, characterized in that, The utility model provides a pen cap (3) is connected to the connecting shell (4) of detachable, the connecting shell (4) is detachably connected with the storage shell (6) in, the storage shell (6) is detachably connected with the extrusion plug (7) in sliding connection, the storage shell (6) is detachably connected with the dosing head (5) on the side away from the fixed shell (1), the fixed shell (1) is fixedly connected with the liquid storage shell (10), the liquid storage shell (10) is fixedly connected with the fixed frame (11) in the fixed shell (1), the fixed frame (11) is slidingly connected with the sliding frame (12), the liquid storage shell (10) and the sliding frame (12) are slidingly connected with the first L shape rod (13) together, the fixed frame (11) and the first L shape rod (13) are fixedly connected with the tension spring, the liquid storage shell (10) is provided with the limiting assembly that the first L shape rod (13) is limited.

2. The drug delivery device with a stable structure according to claim 1, wherein, The first L shape rod (13) is detachably connected with the blocking block (14), and the blocking block (14) is used for blocking the travel direction of the sliding frame (12).

3. The drug delivery device with a stable structure of claim 1, wherein, The limiting assembly comprises a second L shape rod (15), the second L shape rod (15) is sealingly and slidingly connected to the liquid storage shell (10), the second L shape rod (15) is fixedly connected with the first L shape rod (13), the second L shape rod (15) is used for pushing the extrusion plug (7), the second L shape rod (15) is fixedly connected with a fixed plate (16) on the side close to the sliding frame (12) in the liquid storage shell (10), the fixed plate (16) is sealingly and slidingly connected to the liquid storage shell (10), the liquid storage shell (10) is limitingly and rotationally connected with a third L shape rod (17) on the side close to the sliding frame (12), the third L shape rod (17) is rotationally and slidingly connected with the second L shape rod (15), the fixed plate (16) is limitingly and rotationally connected with a blocking plate (18) on the side away from the second L shape rod (15), the blocking plate (18) is spline-connected with the third L shape rod (17), the blocking plate (18) and the fixed plate (16) are provided with through holes in communication with each other, and the blocking plate (18) is used for shielding the through hole on the fixed plate (16).

4. The drug delivery device with a stable structure of claim 3, wherein, The fixed shell (1) is limitingly and rotationally connected with a knob (19) on the side close to the fixed plate (16), the knob (19) is fixedly connected with a fourth L shape rod (20) in the side close to the fixed shell (1), and the third L shape rod (17) is limitingly and rotationally connected with a rotating column (21) on the side close to the sliding frame (12), the rotating column (21) is slidingly connected with the fourth L shape rod (20).

5. The drug delivery device with a stable structure of claim 4, wherein, The knob (19) is slidingly connected with a sliding block (22), the knob (19) and the fixed shell (1) are fixedly connected with a torsional spring, the fixed shell (1) is provided with a pit on the side close to the knob (19), a first magnet (23) is fixedly connected in the pit, and the first magnet (23) is used for adsorbing the sliding block (22).

6. The drug delivery device with a stable structure of claim 5, wherein, The fixed frame (11) is slidably connected with a second magnet (24), and the second magnet (24) is used for adsorbing the sliding block (22).

7. A drug delivery device with a stable structure according to claim 6, characterized in that The adsorption force of the second magnet (24) is greater than that of the first magnet (23).

8. The drug delivery device with a stable structure of claim 6, wherein, The fixed frame (11) is fixedly connected with a connecting rope (25), the connecting rope (25) slides along the side of the fixed frame (11) close to the sliding frame (12), the side of the connecting rope (25) close to the sliding frame (12) is fixedly connected with the second magnet (24), an elastic member is fixedly connected between the connecting rope (25) and the fixed frame (11), the side of the first L-shaped rod (13) close to the sliding frame (12) is rotatably connected with a swing block (26) for extruding the connecting rope (25), and the side of the first L-shaped rod (13) close to the sliding frame (12) is fixedly connected with an elastic plate (27), and the elastic plate (27) and the sliding frame (12) are used for extruding the swing block (26).

9. A delivery device having a stabilizing structure according to claim 8, wherein, The fixed shell (1) is rotatably connected with a rotating barrel (30) inside, the rotating barrel (30) is provided with a threaded groove, the threaded groove is used for driving the sliding frame (12) to move in the fixed shell (1), the fixed shell (1) is rotatably connected with a fixed ring (32) close to the knob (19), and the fixed ring (32) and the rotating barrel (30) are fixedly connected with a connecting block (31).

10. The drug delivery device with a stable structure of claim 9, wherein, The side of the fixed shell (1) close to the knob (19) is provided with a scale, and the outer side of the connecting block (31) is an indicating arrow, which corresponds to the scale on the fixed shell (1).

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