CN116850382A

CN116850382A - Insulin injection pen

Info

Publication number: CN116850382A
Application number: CN202310974205.9A
Authority: CN
Inventors: 陈敏; 叶强; 李嘉娴
Original assignee: Shenzhen City Bao'an District Fuyong People's Hospital
Current assignee: Shenzhen City Bao'an District Fuyong People's Hospital
Priority date: 2023-08-04
Filing date: 2023-08-04
Publication date: 2023-10-10

Abstract

The invention relates to the technical field of insulin injection, and particularly discloses an insulin injection pen, which comprises a shell, wherein the lower end of the shell is connected with a pen cap, a pen rack is sleeved between the pen cap and the shell, a pen core is movably connected in the pen rack, a piston is arranged in the pen core, a cavity is formed in the shell, a rotating assembly and a driving assembly are arranged, the piston is driven by the driving assembly to extrude a medicament in the pen core, drug administration is completed, the rotating assembly is provided with rotating power, the rotating power is transmitted to a toothed bar for rotation by rotation of a gear, the piston and the pen core are driven to stir and mix insulin in the pen core uniformly, the insulin is not required to shake the insulin uniformly in advance by a user, the injected medicament is a uniformly mixed medicament when the insulin is placed in the pen rack and is arranged at the front end of the shell, the insulin is stirred once when the moving stroke of a telescopic block is set, and the insulin is secondarily stirred and the injection is completed when the telescopic block is pressed.

Description

Insulin injection pen

Technical Field

The invention relates to the technical field of insulin injection, in particular to an insulin injection pen.

Background

Insulin is a protein hormone secreted by islet beta cells within the pancreas by stimulation with endogenous or exogenous substances such as glucose, lactose, ribose, arginine, glucagon, and the like. Insulin is the only hormone in the body that reduces blood glucose while promoting glycogen, fat, protein synthesis. Exogenous insulin is mainly used to treat diabetes;

the existing insulin usually adopts an insulin injection pen to inject insulin when injecting, firstly, the injection part is sterilized conventionally, the skin of the injection part is pinched by the left hand, the right hand holds the pen to rapidly advance the needle according to an angle of 45 degrees (lean person) or a vertical angle (fat person), the right thumb presses the injection key to slowly push the liquid medicine at a uniform speed, the needle head stays under the skin for 6 seconds after the injection is finished, then the needle head is pulled out rapidly along the needle-inserting direction, and the needle eye is pressed for 3O seconds by a dry cotton swab. Covering the needle head cap, and ending injection;

the injected insulin is divided into long-acting animal insulin, medium-acting human insulin and long-acting insulin analogues, wherein the former two kinds of insulin are suspension components which have partial precipitation, the suspension components are required to be uniformly dispersed in a solution before reinjection by shaking, and the accuracy and stability of the medicine dosage during injection are ensured, but the existing insulin injection pen mainly depends on the consciousness of a patient to shake the medicine before injection, if the patient forgets to shake uniformly or the shaking effect is poor, the concentration of the medicine liquid is uneven, so that the blood sugar is poorly controlled after injection, and the whole treatment period is delayed.

To this end we propose an insulin injection pen.

Disclosure of Invention

The present invention is directed to an insulin injection pen, which solves the above-mentioned problems.

In order to achieve the above purpose, the present invention provides the following technical solutions: an insulin injection pen comprises a shell, wherein the lower end of the shell is connected with a pen cap, a pen rack is sleeved between the pen cap and the shell, a pen core is movably connected inside the pen rack, a piston is arranged inside the pen core, and a cavity is formed inside the shell;

the rotating assembly is positioned at the upper end of the piston and can rotate the piston, so that the pen core synchronously rotates along with the piston to uniformly mix the long-acting insulin in the pen core; a driving assembly for driving the piston is arranged above the rotating assembly;

the reminding component is arranged below the driving component, and can contact with the reminding component when the driving component moves to the maximum movement range, and the reminding component is triggered to give an alarm.

Preferably, the rotating assembly comprises a threaded rod, the upper end of the threaded rod is connected with the driving assembly, the inner surface of the cavity is fixedly connected with a bearing ring, the upper end of the bearing ring is rotationally connected with a gear through a bearing, a thread groove is formed in the central position of the gear, the thread groove is matched with the threaded rod, the gear is slidingly connected with a toothed bar in a meshed mode, the upper end of the toothed bar is rotationally connected with a push rod through a rotating shaft, the push rod is connected with the driving assembly, the lower end of the toothed bar is fixedly connected with a non-return assembly, the lower end of the non-return assembly is fixedly connected with a piston, the annular outer surface of the piston is provided with a clamping groove, the annular inner surface of the pen core is fixedly connected with a clamping strip corresponding to the clamping groove, and the clamping strip is embedded in the clamping groove.

Preferably, the diameter of the gear is larger than the diameter of the gear rod, and the length of the gear rod is larger than the length of the gear

Preferably, the driving assembly comprises a telescopic block, the telescopic block penetrates through the outer surface of the upper end of the shell and is movably connected with the shell, the lower end of the telescopic block is fixedly connected with the threaded rod, a sliding groove is formed in the center of the outer surface of the lower end of the telescopic block, the push rod is located inside the sliding groove, the upper end of the sliding groove is provided with a single-pass assembly, and the push rod and the sliding groove are of rectangular structural design.

Preferably, the driving assembly further comprises a torsion ring, the torsion ring is rotationally connected with the upper end of the shell through a bearing, the upper end of the torsion ring is in threaded connection with a telescopic block, scales are arranged on the surface of the telescopic block, and sealing is kept between the push rod and the sliding groove.

Preferably, the non-return subassembly includes non-return sleeve, non-return sleeve's annular surface fixedly connected with axle sleeve, axle sleeve and cavity internal surface fixed connection, the inside displacement groove that has seted up that runs through of non-return sleeve, the inside sliding connection of displacement groove has the displacement pole, displacement pole upper end and rack bar lower extreme fixed connection, the lateral wall of displacement pole has been seted up and has been run through the groove, run through the inside sliding connection of groove has the fixture block, the draw-in groove has been seted up with the fixture block corresponding position to non-return sleeve internal surface, the one end fixedly connected with reciprocating spring of draw-in groove is kept away from to the fixture block, the one end and the displacement pole fixed connection of fixture block are kept away from to reciprocating spring, displacement pole lower extreme and piston upper end fixed connection.

Preferably, the non-return subassembly still includes presses the groove, and piston and displacement pole position integrated design presses the groove to offer at the lower extreme surface of piston, presses the inside sliding connection of groove to have the pressing plate, presses the internal surface upper end of groove to offer the groove that resets, presses pressing plate upper end and the corresponding position fixedly connected with reset lever of groove that resets, and the reset lever is located the inside of reset groove, and the drive groove has been offered to fixture block intermediate position, and reset lever and drive groove correspond position fixedly connected with drive plate.

Preferably, the single-pass assembly comprises a single-pass groove, the single-pass groove is formed in the outer surface of the upper end of the telescopic groove, the single-pass groove is communicated with the sliding groove, a single-pass block is slidably connected inside the single-pass groove, a vent groove is formed inside the single-pass block, a reset spring is fixedly connected between the single-pass block and the single-pass groove, and the vent groove is of a T-shaped structural design.

Preferably, the diameter of the ventilation groove in the vertical direction is larger than that of the sliding groove, the ventilation groove in the horizontal direction penetrates through the cambered surface of the ventilation block, and a single-way valve is arranged at the upper end of the ventilation block.

Preferably, the reminding component comprises a timer, the timer is fixedly connected to the outer surface of the shell, the tail of the timer is connected with a switch, the tail of the timer extends to the inside of the shell, and the switch corresponds to the telescopic block.

The invention has at least the following beneficial effects:

according to the invention, the rotary assembly and the driving assembly are arranged, the driving assembly drives the piston to enable the piston to extrude the medicament in the pen core to finish drug delivery, and rotary power is provided for the rotary assembly, so that the rotary power is transmitted to the toothed bar for rotation by the rotation of the gear, the piston and the pen core are driven to rotate to stir and mix insulin in the pen core uniformly, a user is not required to shake the insulin uniformly in advance, the injected medicament is ensured to be a uniformly mixed medicament, the insulin is put into the pen rack and is arranged at the front end of the shell, the insulin is stirred once when the moving stroke of the telescopic block is set, and the insulin is stirred secondarily and injection is finished when the telescopic block is pressed.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is an exploded view of the overall structure of the present invention;

FIG. 3 is a schematic cross-sectional view of the overall structure of the present invention;

FIG. 4 is a schematic view of the structure of the piston and the engaging groove of the present invention;

FIG. 5 is a schematic illustration of a cut-away configuration of a drive assembly of the present invention;

FIG. 6 is an enlarged schematic view of the structure of FIG. 5C according to the present invention;

FIG. 7 is a schematic structural view of the non-return assembly of the present invention;

FIG. 8 is a schematic view of the structure of FIG. 7A according to the present invention;

FIG. 9 is a schematic view of an exploded view of the check assembly of the present invention;

FIG. 10 is an enlarged schematic view of the structure of FIG. 9B according to the present invention;

FIG. 11 is a schematic view of a driving assembly according to the present invention;

fig. 12 is a schematic side view of the overall structure of the present invention in section.

In the figure: 1. a housing; 10. a pen cap; 11. a needle; 12. a pen rack; 13. a pen core; 131. a clamping strip; 14. a cavity; 2. a rotating assembly; 20. a piston; 21. a clamping groove; 22. a displacement rod; 23. a toothed bar; 24. a push rod; 25. a gear; 26. a thread groove; 28. a carrier ring; 29. a threaded rod; 3. a drive assembly; 30. a torsion ring; 31. a telescopic block; 32. a chute; 5. a backstop assembly; 50. a non-return sleeve; 51. a shaft sleeve; 52. a displacement groove; 53. a clamping groove; 54. a reset groove; 55. a through groove; 56. a clamping block; 57. a reciprocating spring; 59. a reset lever; 591. pressing the plate; 592. a pressing groove; 593. a driving plate; 594. a driving groove; 6. a reminder assembly; 60. a timer; 61. a switch; 7. a single pass assembly; 70. a single pass slot; 71. a return spring; 72. a single pass block; 73. a single-pass valve; 74. and a ventilation groove.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1-12, the present invention provides a technical solution: the embodiment 1, an insulin injection pen, including the body 1, the lower extreme of body 1 is connected with the pen cap 10, has cup jointed the pen rack 12 between pen cap 10 and the body 1, the inside swing joint of pen rack 12 has refill 13, refill 13 inside swing joint has the plug, refill 13 inside is equipped with piston 20, piston 20 is located the upper end of plug, the inside cavity 14 of having offered of body 1;

the rotating assembly 2 is positioned at the upper end of the piston 20, and can rotate the piston 20, so that the pen core 13 synchronously rotates along with the piston 20 to uniformly mix insulin in the pen core 13; the complicated shaking step is combined into the process of driving the refill 13 to move, the rotating component 2 rotates and stirs insulin, so that the situation that a patient forgets to shake evenly is avoided, the driving component 3 for driving the piston 20 is arranged above the rotating component 2, insulin is still shaking evenly while being injected, and the shaking effect is improved;

the reminding component 6 is arranged below the driving component 3, when the driving component 3 moves to the maximum movement range, the driving component 3 can be in contact with the reminding component 6, the reminding component 6 is triggered to give an alarm, the needle 11 can be pulled out after the insulin is generally required to stay for 6 seconds after being input into the body, the medicine dose is ensured to be fully injected into the body, meanwhile, medicine liquid leakage is prevented, after the medicine is injected, the driving component 3 and the reminding component 6 are in contact to trigger the reminding component 6 to report, and the needle 11 can be pulled out after 6 seconds.

The rotary assembly 2 comprises a threaded rod 29, the upper end of the threaded rod 29 is connected with the driving assembly 3, the inner surface of the cavity 14 is fixedly connected with a bearing ring 28, the upper end of the bearing ring 28 is rotationally connected with a gear 25 through a bearing, a thread groove 26 is formed in the central position of the gear 25, the thread groove 26 is matched with the threaded rod 29 and is in sliding connection with the threaded rod 29, a toothed bar 23 is meshed with the annular outer surface of the gear 25, the upper end of the toothed bar 23 is rotationally connected with a push rod 24 through a rotating shaft, the push rod 24 is connected with the driving assembly 3, the lower end of the toothed bar 23 is fixedly connected with a non-return assembly 5, the lower end of the non-return assembly 5 is fixedly connected with a piston 20, a clamping groove 21 is formed in the annular outer surface of the piston 20, a clamping bar 131 is fixedly connected with the corresponding position of the annular inner surface of the cartridge 13 and the clamping groove 21, and the clamping bar 131 is embedded in the clamping groove 21;

when the driving component 3 forces the push rod 24 and the threaded rod 29 to move downwards, the push rod 24 provides vertical thrust for the piston 20 to move downwards in the pen refill 13, so that insulin is pushed out along the pen refill 13, the threaded rod 29 moves downwards, the vertical downward displacement is converted into the rotation number of the gear 25 through the thread groove 26, the rotating power is transmitted to the piston 20 through the toothed rod 23, the piston 20 rotates, the pen refill 13 is driven by the piston 20 through the clamping strip 131 and the clamping groove 21, the clamping strip 131 and the pen refill 13 rotate in the pen rack 12, and the clamping strip 131 stirs insulin in the pen refill 13, so that insulin is uniformly distributed in a solution.

The diameter of the gear 25 is larger than that of the toothed bar 23, so that the rotation speed of the toothed bar 23 and the piston 20 is increased, a certain resistance exists when the driving assembly 3 moves, the length of the toothed bar 23 is larger than that of the gear 25, and the toothed bar 23 needs to keep the displacement in the vertical direction while transmitting torque;

the driving assembly 3 comprises a telescopic block 31, the telescopic block 31 penetrates through the outer surface of the upper end of the shell 1 and is movably connected with the shell 1, the lower end of the telescopic block 31 is fixedly connected with the threaded rod 29, a sliding groove 32 is formed in the center of the outer surface of the lower end of the telescopic block 31, the push rod 24 is positioned in the sliding groove 32, the upper end of the sliding groove 32 is provided with a single-pass assembly 7, the push rod 24 and the sliding groove 32 are of rectangular structural design, and downward movement of the piston 20 can be completed by directly pressing the telescopic block 31;

when the telescopic block 31 is pressed, the thumb of a user can block the surface of the single-pass assembly 7, the push rod 24 is prevented from extruding air in the sliding groove 32, the pushing force of the telescopic block 31 to the push rod 24 is ensured, after one pen core 13 is dosed, the pen rack 12 is pulled down by the user, the pen core 13 in the pen rack 12 is taken out, the piston 20 is pushed to reset, at the moment, resistance exists between the telescopic block 31 and the shell 1, the push rod 24 moves upwards along the sliding groove 32 to compress the air in the sliding groove 32 to the single-pass assembly 7, the air in the sliding groove 32 is discharged outwards by the single-pass assembly 7, then a new pen core 13 is inserted into the pen rack 12, and the clamping strip 131 of the pen core 13 is aligned with the clamping groove 21 of the piston 20 so that the piston 20 is contacted with the rubber plug in the pen core 13.

Example 2:

in the second embodiment, other structures are unchanged, the driving assembly 3 further comprises a torsion ring 30, the torsion ring 30 is rotationally connected with the upper end of the housing 1 through a bearing, the upper end of the torsion ring 30 is in threaded connection with a telescopic block 31, scales are arranged on the surface of the telescopic block 31, sealing is kept between the push rod 24 and a chute 32, and the height of the telescopic block 31 is changed by rotating the torsion ring 30, so that injection quantity adjustment is more accurate.

The non-return assembly 5 comprises a non-return sleeve 50, a shaft sleeve 51 is fixedly connected with the annular outer surface of the non-return sleeve 50, the shaft sleeve 51 is fixedly connected with the inner surface of the cavity 14, the shaft sleeve 51 acts like a bearing, a displacement groove 52 is penetrated and arranged in the non-return sleeve 50, a displacement rod 22 is slidingly connected in the displacement groove 52, the displacement rod 22 and the displacement groove 52 are both in rectangular structural design, the upper end of the displacement rod 22 is fixedly connected with the lower end of the toothed bar 23, a penetrating groove 55 is arranged on the side wall of the displacement rod 22, a clamping block 56 is slidingly connected in the penetrating groove 55, a clamping groove 53 is arranged on the inner surface of the non-return sleeve 50 corresponding to the clamping block 56, one end of the clamping block 56 away from the clamping groove 53 is fixedly connected with a reciprocating spring 57, one end of the reciprocating spring 57 away from the clamping block 56 is fixedly connected with the displacement rod 22, the lower end of the displacement rod 22 is fixedly connected with the upper end of the piston 20,

since the insulin in the refill 13 is always injected quantitatively for a plurality of times, after the first injection, the telescopic block 31 reaches the maximum limit of movement, then the telescopic block 31 is required to be lifted for the second injection, the toothed bar 23 rotates and moves downwards during the first injection, the non-return sleeve 50 is driven to rotate simultaneously, the non-return sleeve 50 rotates in the cavity 14 through the shaft sleeve 51, the vertical displacement is kept to be zero, at the moment, the toothed bar 23 pushes the displacement bar 22 at the lower end to move downwards along the displacement groove 52, the piston 20 is pushed to move in the refill 13, at the moment, the clamping block 56 in the displacement bar 22 contacts with the inclined surface of the clamping groove 53, and as the movement continues, the clamping block 56 is extruded by the clamping groove 53 to compress the reciprocating spring 57 along the through groove 55, and a click sound colliding with the clamping groove 53 is generated, so that the non-return assembly 5 works normally, the unidirectional non-return is carried out on the displacement bar 22, and the stability of the refill device is increased;

after the primary injection is finished, the torsion ring 30 is rotated for a period of time, the position of the telescopic block 31 is adjusted, the vertical upward displacement of the displacement rod 22, the toothed bar 23 and the push rod 24 is zero due to the limitation of the clamping block 56 and the clamping groove 53, the piston 20 is kept at the position where the primary injection is finished, the threaded rod 29 is pulled to move due to the vertical displacement change of the telescopic block 31, at the moment, the gear 25 is driven to reversely rotate by the threaded groove 26 and the threaded rod 29 and is transmitted to the piston 20 through the meshed toothed bar 23, the refill 13 is driven to reversely rotate, insulin in the refill 13 is stirred, the mixing effect of the insulin is further improved, and after the position of the telescopic block 31 is determined, the secondary injection is carried out, and the steps of the primary injection are repeated.

Example 3:

in the second embodiment, other structures are unchanged, the non-return assembly 5 further comprises a pressing groove 592, the piston 20 and the displacement rod 22 are integrally designed, the pressing groove 592 is formed in the outer surface of the lower end of the piston 20, a pressing plate 591 is slidably connected in the pressing groove 592, a reset groove 54 is formed in the upper end of the inner surface of the pressing groove 592, a reset rod 59 is fixedly connected to the position, corresponding to the reset groove 54, of the upper end of the pressing plate 591, the reset rod 59 is positioned in the reset groove 54, a driving groove 594 is formed in the middle position of the clamping block 56, and a driving plate 593 is fixedly connected to the position, corresponding to the driving groove 594, of the reset rod 59;

after insulin injection of the refill 13 is finished, firstly, the pen rack 12 is taken down, the refill 13 in the pen rack 12 is taken out, the pen rack 12 is replaced by a new refill 13, then a user presses the pressing plate 591 through a thumb, the pressing plate 591 drives the reset rod 59 to move along the reset groove 54, the driving plate 593 is inserted into the driving groove 594 with an inclined structure design to force the clamping block 56 to retract along penetrating, the clamping groove 53 is separated, then the whole piston 20 is propped to an initial position, then the piston 20 and the refill 13 are installed, injection treatment of the next treatment course is carried out, the reset rod 59 and the reset groove 54 are kept sealed, the reset rod 59 is of a rectangular structure design, and the piston 20 can be quickly reset through the structure, so that the next use is facilitated.

The single-pass assembly 7 comprises a single-pass groove 70, the single-pass groove 70 is formed in the outer surface of the upper end of the telescopic groove, the single-pass groove 70 is communicated with the sliding groove 32, a single-pass block 72 is slidably connected inside the single-pass groove 70, a ventilation groove 74 is formed inside the single-pass block 72, a reset spring 71 is fixedly connected between the single-pass block 72 and the single-pass groove 70, and the ventilation groove 74 is of a T-shaped structural design;

when the piston 20 needs to be reset, when the push rod 24 is pushed by use to start to reset, the air in the slide groove 32 is compressed by moving upwards along the slide groove 32, at this time, the air pressure pushes the single-pass block 72 to move upwards along the single-pass groove 70 and stretches the reset spring 71 until the ventilation groove 74 in the horizontal direction is partially separated from the single-pass groove 70 and is connected with the outside air, and the air in the slide groove 32 is discharged along the T-shaped ventilation groove 74, so that the push rod 24 can be reset smoothly.

The diameter of the ventilation groove 74 in the vertical direction is larger than that of the chute 32, the ventilation groove 74 in the horizontal direction penetrates through the cambered surface of the air block, effective transmission of air is guaranteed, the upper end of the air block is provided with a single-pass valve 73, the single-pass valve 73 can only be used for air inlet and can not be used for air exhaust, the single-pass block 72 and the single-pass groove 70 are kept sealed, and the push rod 24 can smoothly slide in the chute 32 through the mutual cooperation of the structure, so that the corresponding use effect is achieved.

The reminding component 6 comprises a timer 60, the timer 60 is fixedly connected to the outer surface of the shell 1, a switch 61 is connected to the tail of the timer 60, the tail of the timer 60 extends into the shell 1, the switch 61 corresponds to the lower end of the telescopic block 31, when the telescopic block 31 moves upwards, the timer 60 can leave the switch 61, the timer 60 is activated, after the countdown injection is finished, the telescopic block 31 moves downwards to contact the switch 61 again, at the moment, the timer 60 sounds in seconds, the needle 11 is conveniently used for judging the subcutaneous time, the insulin absorption is improved, when the sound is finished, the 6 seconds are indicated to be passed, the timer 60 enters a dormant state, and then the needle 11 can be pulled out.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present 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 therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an insulin injection pen, includes, casing (1), the lower extreme of casing (1) is connected with pen cap (10), pen cap (10) have cup jointed pen rack (12) between casing (1), inside swing joint of pen rack (12) has refill (13), refill (13) inside is equipped with piston (20), its characterized in that: a cavity (14) is formed in the shell (1);

the rotary component (2) is positioned at the upper end of the piston (20), and can rotate the piston (20), so that the pen core (13) synchronously rotates along with the piston (20) to uniformly mix the long-acting insulin in the pen core (13); a driving assembly (3) for driving the piston (20) is arranged above the rotating assembly (2);

the reminding component (6), the below at drive assembly (3) is established to the reminding component (6), and when drive assembly (3) motion to the biggest motion scope of setting can with remind component (6) contact to trigger and remind component (6) can send out the alarm.

2. An insulin injection pen according to claim 1, characterized in that: the rotary assembly (2) comprises a threaded rod (29), the upper end of the threaded rod (29) is connected with the driving assembly (3), the inner surface of the cavity (14) is fixedly connected with a bearing ring (28), the upper end of the bearing ring (28) is rotationally connected with a gear (25) through a bearing, a thread groove (26) is formed in the central position of the gear (25), the thread groove (26) is mutually matched with the threaded rod (29), the threaded rod (29) is in sliding connection, the annular outer surface of the gear (25) is meshed with a toothed bar (23), the upper end of the toothed bar (23) is rotationally connected with a push rod (24) through a rotating shaft, the push rod (24) is connected with the driving assembly (3), the lower end of the toothed bar (23) is fixedly connected with a non-return assembly (5), the lower end of the non-return assembly (5) is fixedly connected with a piston (20), a clamping groove (21) is formed in the annular outer surface of the piston (20), a clamping groove (21) is formed in the annular inner surface of the cartridge (13), and the clamping bar (131) is fixedly connected with a clamping bar (131) corresponding to the clamping groove (21), and the clamping bar (131) is embedded into the clamping bar (21).

3. An insulin injection pen according to claim 2, characterized in that: the diameter of the gear (25) is larger than that of the toothed bar (23), and the length of the toothed bar (23) is larger than that of the gear (25).

4. An insulin injection pen according to claim 2, characterized in that: the driving assembly (3) comprises a telescopic block (31), the telescopic block (31) penetrates through the outer surface of the upper end of the shell (1) and is movably connected with the shell (1), the lower end of the telescopic block (31) is fixedly connected with a threaded rod (29), a sliding groove (32) is formed in the center of the outer surface of the lower end of the telescopic block (31), the push rod (24) is located inside the sliding groove (32), the upper end of the sliding groove (32) is provided with a single-pass assembly (7), and the push rod (24) and the sliding groove (32) are of rectangular structural design.

5. An insulin injection pen according to claim 4, characterized in that: the driving assembly (3) further comprises a torsion ring (30), the torsion ring (30) is rotationally connected with the upper end of the shell (1) through a bearing, the upper end of the torsion ring (30) is in threaded connection with a telescopic block (31), scales are arranged on the surface of the telescopic block (31), and sealing is kept between the push rod (24) and the sliding groove (32).

6. An insulin injection pen according to claim 2, characterized in that: the non-return subassembly (5) is including non-return sleeve (50), the annular surface fixedly connected with axle sleeve (51) of non-return sleeve (50), axle sleeve (51) and cavity (14) internal surface fixed connection, displacement groove (52) have been seted up in the inside running through of non-return sleeve (50), displacement groove (52) inside sliding connection has displacement pole (22), displacement pole (22) upper end and rack bar (23) lower extreme fixed connection, run through groove (55) have been seted up to the lateral wall of displacement pole (22), run through groove (55) inside sliding connection has fixture block (56), draw-in groove (53) have been seted up with fixture block (56) corresponding position to non-return sleeve (50) internal surface, the one end fixedly connected with reciprocating spring (57) of fixture block (56) keep away from fixture block (53), the one end and the displacement pole (22) fixed connection of fixture block (56) are kept away from to reciprocating spring (57), displacement pole (22) lower extreme and piston (20) upper end fixed connection.

7. An insulin injection pen according to claim 6, characterized in that: the non-return subassembly (5) still includes pressing groove (592), piston (20) and displacement pole (22) integrative design in position, pressing groove (592) are seted up at the lower extreme surface of piston (20), pressing groove (592) inside sliding connection has pressing plate (591), reset groove (54) have been seted up to pressing groove (592)'s internal surface upper end, pressing plate (591) upper end and reset groove (54) corresponding position fixedly connected with reset rod (59), reset rod (59) are located reset groove (54) inside, drive groove (594) have been seted up to fixture block (56) intermediate position, reset rod (59) and drive groove (594) correspond position fixedly connected with drive plate (593).

8. An insulin injection pen according to claim 5, characterized in that: the single-pass assembly (7) comprises a single-pass groove (70), the outer surface of the upper end of the telescopic groove is formed in the single-pass groove (70), the single-pass groove (70) is communicated with the sliding groove (32), a single-pass block (72) is connected inside the single-pass groove (70) in a sliding mode, a ventilation groove (74) is formed inside the single-pass block (72), a reset spring (71) is fixedly connected between the single-pass block (72) and the single-pass groove (70), and the ventilation groove (74) is of a T-shaped structural design.

9. An insulin injection pen according to claim 8, characterized in that: the diameter of the ventilation groove (74) in the vertical direction is larger than that of the sliding groove (32), the ventilation groove (74) in the horizontal direction penetrates through the cambered surface of the air block, and a single-pass valve (73) is arranged at the upper end of the air block.

10. An insulin injection pen according to claim 1, characterized in that: the reminding component (6) comprises a timer (60), the timer (60) is fixedly connected to the outer surface of the shell (1), a switch (61) is connected to the tail of the timer (60), the tail of the timer (60) extends to the inside of the shell (1), and the switch (61) corresponds to the lower end of the telescopic block (31).