Automatic injection device with resistance reduction function

Abstract

The utility model belongs to the field of medicine injection device, specifically disclose a kind of automatic injection device with resistance reduction function, including shell, the shell is by upper shell, window and lower shell composition;Reset mechanism, including reset guide sleeve, reset spring and catch assembly, the reset spring is sleeved in window, for driving reset guide sleeve reverse movement, the top of reset spring is provided with reset guide sleeve, the catch assembly is set on window, for reset spring axial preloading;Resistance reduction mechanism, including the boss upper end surface on the setting on the pressure relief sleeve and the upper end inclined plane on reset guide sleeve, the boss upper end surface and upper end inclined plane correspond;The utility model is set to drive spring by setting pressure relief sleeve, by driving pressure relief sleeve reverse movement to injection direction when needle resets, reduce the compression amount of drive spring, to reduce the moving resistance that reset guide sleeve needs to overcome when making injection needle retract into shell, improve needle retracting speed.

Description

Technical Field

[0001] This utility model belongs to the field of injection devices, specifically relating to an automatic injection device with a resistance reduction function. Background Technology

[0002] Automatic drug delivery systems (ADSs) are devices that can administer medication automatically and are widely used in the medical field, especially in chronic disease management, emergency care, and analgesia. The main goal of these devices is to improve the accuracy and convenience of medication administration, reduce errors caused by human operation, and improve patient compliance.

[0003] In existing automated drug injection devices, the injection process is completed by at least one drive spring with a preload device.

[0004] However, in traditional automated drug injection devices, after injection, the needle cannot be quickly and stably pushed back into the housing due to the large resistance of the drive spring. Utility Model Content

[0005] The purpose of this invention is to provide an automatic injection device with a drag reduction function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An automatic injection device with drag reduction function includes a housing, which is composed of an upper outer shell, a viewing window and a lower outer shell. A syringe is disposed inside the upper outer shell, and an injection plunger is movably disposed inside the syringe. The viewing window is snapped into the bottom of the upper housing, and the lower outer shell is snapped into the bottom of the viewing window.

[0008] A spring-driven injection mechanism, wherein the spring-driven injection assembly includes a pressure-reducing sleeve, a drive spring, and an injection plunger. The pressure-reducing sleeve is movably disposed within an upper housing, and a stop surface for limiting the pressure-reducing sleeve is provided within the upper housing. The injection plunger is movably disposed within the syringe, and the drive spring is located between the injection plunger and the pressure-reducing sleeve.

[0009] The reset mechanism includes a reset guide sleeve, a reset spring, and a latch assembly. The reset spring is sleeved inside the viewing window and is used to drive the reset guide sleeve to move in the opposite direction. The reset guide sleeve is provided on the top of the reset spring. The latch assembly is provided on the viewing window and is used for axial preload of the reset spring.

[0010] The drag reduction mechanism includes an upper surface of a boss disposed on the pressure reducing sleeve and an upper inclined surface on a reset guide sleeve. The upper surface of the boss and the upper inclined surface correspond to each other and are used to release the limiting state of the pressure reducing sleeve.

[0011] Preferably, a top cap button is movably mounted on the top of the upper housing, and a Y-shaped elastic support penetrating the pressure-reducing sleeve is provided at the top of the injection push rod. A locking tongue is installed at the bottom of the top cap button at the opening of the Y-shaped elastic support.

[0012] Preferably, guide posts are installed on both sides of the injection plunger, and levers are provided on the guide posts. The top surface of the reset guide sleeve is provided with an unlocking slope corresponding to the guide posts.

[0013] Preferably, the side of the reset guide sleeve is provided with a positioning post, the top outer side of the window is provided with a latch corresponding to the positioning post, and a horizontal bar is provided on the window on one side of the latch.

[0014] Preferably, the outer surface of the upper housing is provided with a label, the window is provided with an inner liner corresponding to the syringe, and the return spring is sleeved on the inner liner.

[0015] Preferably, a guide groove is provided on the inner side of the bottom end of the upper outer shell, an upper hanging platform is provided on the inner side of the top end of the upper outer shell, and a hanging platform bottom surface is provided on the lower surface of the upper hanging platform.

[0016] Preferably, the pressure-reducing sleeve has guide grooves on both sides and a fixing ring at the bottom to limit the position of the syringe.

[0017] Preferably, the syringe is provided with a syringe needle at the bottom, and a needle sheath is tightly fitted onto the syringe needle.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention reduces the compression of the drive spring by setting a pressure-reducing sleeve on the drive spring and driving the pressure-reducing sleeve to move in the opposite direction of injection when the needle is reset, thereby reducing the moving resistance that the reset guide sleeve needs to overcome when the injection needle retracts into the housing and increasing the needle retraction speed. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a partial structural diagram of the 001 component of this utility model;

[0023] Figure 3 This is a partial structural diagram of the injection plunger of this utility model;

[0024] Figure 4 This is a partial structural diagram of the 002 component of this utility model;

[0025] Figure 5 This is a partial structural diagram of the upper outer shell of this utility model;

[0026] Figure 6 This is a partial structural diagram of the 003 component of this utility model;

[0027] Figure 7 This is a partial structural diagram of the 004 component of this utility model;

[0028] Figure 8 This is a partial structural diagram of the top cap button of this utility model;

[0029] Figure 9 This is a partial structural diagram of the 005 and 006 components of this utility model;

[0030] Figure 10 This is a partial structural diagram of the syringe of this utility model;

[0031] Figure 11 This is a partial structural diagram of the 011 component of this utility model;

[0032] Figure 12 This is a partial structural diagram of the reset guide sleeve and reset spring of this utility model;

[0033] Figure 13 This is a partial structural diagram of the 022 component of this utility model;

[0034] Figure 14 This is a partial structural diagram of the 033 component of this utility model;

[0035] Figure 15 This is a partial structural diagram of the 006 and 033 components of this utility model. Detailed Implementation

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0039] As attached Figure 1 , 2 As shown in 5, 12, 13, 14 and 15:

[0040] Example 1: This example provides an automatic injection device with a resistance reduction function, including a housing. The housing consists of an upper outer shell 3, a viewing window 5, and a lower outer shell 6. A syringe 15 is disposed inside the upper outer shell 3, and an injection push rod 10 is movably disposed inside the syringe 15. The viewing window 5 is snapped onto the bottom of the upper outer shell 3, and the lower outer shell 6 is snapped onto the bottom of the viewing window 5. A spring-driven injection mechanism is provided, which includes a pressure-reducing sleeve 8, a drive spring 9, and an injection push rod 10. The pressure-reducing sleeve 8 is movably disposed inside the upper outer shell 3, and a stop surface 3-6 is provided inside the upper outer shell 3 to limit the pressure-reducing sleeve 8. The injection push rod 10 is movably disposed inside the injection window 6. Inside the device 15, the drive spring 9 is located between the injection push rod 10 and the pressure reducing sleeve 8; the reset mechanism includes a reset guide sleeve 13, a reset spring 14, and a retaining assembly. The reset spring 14 is sleeved inside the viewing window 5 and is used to drive the reset guide sleeve 13 to move in the opposite direction. The reset guide sleeve 13 is provided on the top of the reset spring 14. The retaining assembly is provided on the viewing window 5 and is used for axial preload of the reset spring 14; the drag reduction mechanism includes an upper surface 8-6 of the boss on the pressure reducing sleeve 8 and an upper inclined surface 13-4 on the reset guide sleeve 13. The upper surface 8-6 of the boss corresponds to the upper inclined surface 13-4 and is used to release the limiting state of the pressure reducing sleeve 8.

[0041] Guide posts 10-3 are installed on both sides of the injection push rod 10. A lever 10-6 is provided on the guide post 10-3. The top surface of the reset guide sleeve 13 is provided with an unlocking slope 13-4 corresponding to the guide post 10-3.

[0042] The side of the reset guide sleeve 13 is provided with a positioning post 13-3, and the top outer side of the window 5 is provided with a latch 5-4 corresponding to the positioning post 13-3. A crossbar 5-5 is provided on the window 5 on one side of the latch 5-4.

[0043] When the injection is completed, the inclined surface of the lever 10-6 pushes the positioning post 13-3 of the reset guide sleeve 13 to move by an angle again, so that it moves out of the horizontal bar 5-5 of the viewing window 5. The inclined surface 8-7 at the lower end of the boss of the pressure relief sleeve 8 rotates by an angle under the push of the inclined surface 13-4 on the upper end of the reset guide sleeve 13, so that the upper end surface 8-6 of the boss of the pressure relief sleeve 8 moves out of the stop surface 3-6 of the upper outer shell 3, triggering the reverse reset state. In this state, the pressure relief sleeve 8 moves in the opposite direction of the injection direction under the elastic force of the drive spring 9 until the stop surface 8-8 of the boss of the pressure relief sleeve 8 contacts the bottom surface 3-7 of the step of the upper outer shell 3 and stops moving. By driving the pressure relief sleeve 8 to move a certain distance along the same axial direction as the reset guide sleeve 13, the compression of the drive spring 9 is reduced, thereby reducing the moving resistance that the reset guide sleeve 13 needs to overcome when the injection needle retracts into the shell and increasing the needle retraction speed.

[0044] Specifically, a top cap button 1 is movably installed on the top of the upper outer shell 3, and a Y-shaped elastic mounting plate 10-1 that penetrates the pressure reducing sleeve 8 is provided at the top of the injection push rod 10. A locking tongue 1-3 is installed at the bottom of the top cap button 1 at the opening of the Y-shaped elastic mounting plate 10-1.

[0045] Specifically, a label 4 is provided on the outer surface of the upper outer shell 3, and an inner liner 5-1 corresponding to the syringe 15 is provided inside the window 5, with the return spring 14 sleeved on the inner liner 5-1.

[0046] Specifically, a guide groove 3-4 is provided on the inner side of the bottom end of the upper outer shell 3, an upper hanging platform 3-5 is provided on the inner side of the top end of the upper outer shell 3, and a hanging platform bottom surface 306 is provided on the lower surface of the upper hanging platform 3-5.

[0047] Specifically, guide grooves 803 are provided on both sides of the pressure-reducing sleeve 8, and a fixing ring 11 is provided at the bottom of the pressure-reducing sleeve 8 to limit the position of the syringe 15.

[0048] Specifically, the syringe 15 has a syringe needle 17 at its bottom, and a needle sheath 18 is tightly fitted onto the syringe needle 17.

[0049] As shown above, the product assembly process is as follows:

[0050] As attached Figure 2 and 3As shown: The component, marked 001, consists of a pressure-reducing sleeve 8, a drive spring 9, an injection push rod 10, and a retaining ring 11. One end 9-1 of the drive spring 9 abuts against the inner wall 8-1 of the top surface of the pressure-reducing sleeve 8, and the other end 9-2 abuts against the support surface 10-2 of the injection push rod 10. The injection push rod 10 is guided by the guide post 10-3 and the guide groove 8-3 of the pressure-reducing sleeve 8, and extends into the pressure-reducing sleeve 8, giving the drive spring 9 a certain preload. The compression continues until the Y-shaped elastic platform 10-1 of the injection push rod 10 hangs on the end face 8-2 of the pressure reducing sleeve 8. The groove 11-1 of the fixing ring 11 is inserted into the flat end 10-4 of the rod body of the injection push rod 10. The locking point 11-2 on the inner side of the groove is locked onto the opposite end of the flat end 10-4 of the rod body. The lower end face 11-3 of the groove is supported on the support surface 10-5 of the injection push rod 10. The upper end 11-4 is axially fixed against the lower end 8-4 of the pressure reducing sleeve 8.

[0051] As attached Figure 4 and 5 As shown: The component, which is marked as 002, consists of component 001 and upper housing 3. The guide post 10-3 of the injection push rod 10 is introduced from the bottom guide groove 3-4 of the upper housing until a pair of symmetrical bosses 8-5 on the outer surface of the pressure relief sleeve 8 are engaged with the upper hanging platform 3-5 of the upper housing 3 by a certain thrust. At the same time, a symmetrical stop surface on the outer surface of the pressure relief sleeve 8 abuts against the bottom surface 3-6 of the hanging platform of the upper housing 3.

[0052] As attached Figure 6 As shown: The component marked as 003 consists of component 002 and safety lock 2. The indicator 2-1 of safety lock 2 is aligned with the lock mark 3-3 on the upper shell 3. The wedge-shaped rib 2-2 of safety lock 2 is inserted into the corresponding positioning groove 3-2 on the upper shell 3. With appropriate pressure, the peripheral buckle ring 2-3 on the inner surface of safety lock 2 is engaged into the peripheral groove 3-1 on the outer surface of the upper shell 3.

[0053] As attached Figure 7 and 8 As shown: The component, marked as 004, consists of component 003 and top cap button 1. Under appropriate pressure, the upper edge of the outer surface of the top cap button 1's peripheral locking ring 1-2 contacts the lower edge of the inner surface of the safety lock 2's peripheral locking ring 2-4. The two symmetrical spring pieces 1-1 of the top cap button 1 contact the two corresponding wedge-shaped ribs 2-2 through the two symmetrical slots 2-5 of the safety lock 2, generating an appropriate upward pushing force to keep the locking rings of the top cap button 1 and the safety lock 2 in contact and fixed. At this time, the locking tongue 1-3 of the top cap button 1 abuts against the inner side of the Y-shaped elastic mounting platform 10-1 of the injection push rod 10, preventing the mounting platform from deforming inward and detaching from the end face 8-2 of the pressure reducing sleeve 8. The stop position 1-4 of the top cap button 1 abuts against the boss 3-4 of the upper outer shell 3, preventing the top cap button 1 from moving downward axially.

[0054] As attached Figure 7 , 8 As shown in 9 and 10: The component, which is generally identified as 006, consists of component 004, component 005 and rubber pad 12. The rubber pad 12 is fitted into the bottom surface of the flange 15-1 of the syringe 15. The component 005 fitted into the rubber pad 12 is inserted into the elastic groove 11-4 of the retaining ring 11 along the injection push rod 10 of component 004.

[0055] As attached Figure 11 and 12 As shown: The component, marked 011, consists of a window 5, a reset guide sleeve 13, and a reset spring 14. The reset spring 14 is fitted into the inner liner 5-1 of the window 5, with one end abutting against the support post 5-2. The outer ring of the spring bushing 13-1 of the reset guide sleeve 13 is fitted into the inner ring of the spring 14, and the inner ring is fitted into the inner liner 5-1 of the window. The spring preload surface 13-2 abuts against the other end of the reset spring 14. The positioning post 13-3, which protrudes outward from the outer circle of the reset guide sleeve 13, moves downward along the guide groove 5-3 of the window 5 to the stop position, and then rotates by an angle to engage with the latch 5-4, which has the same shape as the window 5, thus locking it axially.

[0056] As attached Figure 13 As shown: The component marked as 022 consists of component 011 and lower shell 6. The guide groove 6-1 of the lower shell 6 fits into the outer circular surface 5-5 of the window 5. The mounting platform 6-2 of the lower shell 6 hangs on the step 5-6 of the window and is axially fixed. The guide groove 6-3 of the lower shell 6 leads to the support rib 5-2 of the window 5 to prevent rotation.

[0057] As attached Figure 14 As shown: The component marked as 033 consists of component 022 and pen cap 7. The bottom end of the guide spring 7-1 of pen cap 7 is locked at point 7-2, which is engaged with buckle 6-2 through the guide groove 6-1 of the lower outer shell.

[0058] As attached Figure 15 As shown: The components marked 033 and 006 together form a complete product marked 100. The boss 5-7 of the window 5 is inserted into the guide groove 3-7 of the upper shell 3. The upper shell 3 is fitted into the outer circular surface 5-8 of the window 5. The window 5 is then engaged with the buckle 3-8 of the upper shell 3 at the locking point 5-9, thus completing the assembly process of this product.

[0059] It has fewer parts, is simple to manufacture and assemble, and is easy for people to use.

[0060] The working principle is as follows:

[0061] When the pen cap 7 is rotated in the direction of the arrow, the locking point 7-2 of the pen cap 7 disengages from the buckle 6-2 of the lower outer shell 6, and the arc-shaped protrusion 7-3 of the pen cap 7 is axially pushed away from the lower outer shell 6 by the corresponding arc-shaped protrusion 6-3 of the lower outer shell 6 under the action of rotational force.

[0062] Safety lock 2 rotates top cap button 1 by an angle, aligning the indicator 2-1 of safety lock 2 with the unlock mark 3-4 of the upper housing 3. At this time, the stop position 1-4 of top cap button 1 moves out of the boss 3-4 of housing 3, facilitating the downward axial movement of top cap button 1. After rotating by an angle, the locking tongue 1-3 of top cap button 1 creates a space with the inner side of the Y-shaped elastic mounting platform 10-1 of injection push rod 10, facilitating the platform to deform inward and disengage from the end face 8-2 of the aforementioned pressure reducing sleeve 8.

[0063] As the top cap button 1 moves downward, the outer inclined surface of the Y-shaped elastic platform 10-1 of the injection push rod 10 is squeezed by the inner edge 1-5 of the cylindrical end face of the top cap button 1, disengaging from the end face 8-2 of the aforementioned pressure relief sleeve 8 and moving downward. The inclined surface of the guide post 10-3 of the injection push rod 10 is squeezed to the unlocking inclined surface 13-4 of the reset guide sleeve 13.

[0064] The aforementioned compression of the reset guide sleeve 13 rotates by an angle, and the positioning column 13-3 disengages from the latch 5-4 of the window 5 and moves to the horizontal bar 5-5 of the window 5. At this time, the injection push rod 10 continues downward along the guide groove 3-4 of the upper outer shell 3 with the guide column 10-3, pushing the piston 16 to drive the entire syringe assembly to move, so that the syringe needle moves out of the end face of the lower outer shell 6 and pierces the skin of the "recipient" until the rubber pad 12 contacts the end face of the inner liner 5-1 of the window 5.

[0065] Under the action of the drive spring 9, the injection push rod 10 continues to move downward until the injection is completed. At this time, the inclined surface of the lever 10-6, which is integrated with the guide post of the injection push rod 10, pushes the positioning post 13-3 of the reset guide sleeve 13, and moves it by an angle again, so that it moves out of the horizontal bar 5-5 of the viewing window 5. The inclined surface 8-7 at the lower end of the boss of the pressure relief sleeve 8 rotates by an angle under the push of the inclined surface 13-4 at the upper end of the reset guide sleeve 13, so that the upper end surface 8-6 of the boss of the pressure relief sleeve 8 moves out of the stop surface 3-6 of the upper outer shell 3, triggering the reverse reset state.

[0066] In the aforementioned state, the pressure-reducing sleeve 8 moves in the opposite direction of injection under the elastic force of the drive spring 9. When the stop surface 8-8 of the boss of the pressure-reducing sleeve 8 contacts the bottom surface 3-7 of the step of the upper outer shell 3, it stops moving.

[0067] Driven by the reset spring 14, the reset guide sleeve 13 moves upward until the upper end face 13-5 of the reset guide sleeve 13 contacts the bottom surface 3-6 of the boss of the upper outer shell 3. At this time, the injection needle retracts into the lower outer shell 6 and automatically completes the entire injection process. Due to the possible relaxation of the elasticity of the reset spring 14, the reset guide sleeve 13 will move downward. At this time, the hook 13-6 of the reset guide sleeve 13 will be hooked on the top surface 3-8 of the boss of the upper outer shell 3 for positioning.

[0068] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0069] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0070] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An automatic injection device with drag reduction function, characterized in that: include, The housing consists of an upper outer shell (3), a viewing window (5) and a lower outer shell (6). A syringe (15) is provided inside the upper outer shell (3). An injection plunger (10) is movably provided inside the syringe (15). The viewing window (5) is snapped into the bottom of the upper housing (3). The lower outer shell (6) is snapped into the bottom of the viewing window (5). A spring-driven injection mechanism, the spring-driven injection assembly includes a pressure-reducing sleeve (8), a driving spring (9) and an injection push rod (10). The pressure-reducing sleeve (8) is movably disposed within the upper outer shell (3). The upper outer shell (3) is provided with a stop surface (3-6) for limiting the pressure-reducing sleeve (8). The injection push rod (10) is movably disposed within the syringe (15). The driving spring (9) is located between the injection push rod (10) and the pressure-reducing sleeve (8). The reset mechanism includes a reset guide sleeve (13), a reset spring (14), and a latch assembly. The reset spring (14) is sleeved inside the window (5) and is used to drive the reset guide sleeve (13) to move in the opposite direction. The reset guide sleeve (13) is provided on the top of the reset spring (14). The latch assembly is provided on the window (5) and is used for axial preload of the reset spring (14). The drag reduction mechanism includes an upper surface (8-6) of a boss on the pressure reducing sleeve (8) and an upper inclined surface (13-4) on the reset guide sleeve (13). The upper surface (8-6) of the boss and the upper inclined surface (13-4) correspond to each other and are used to release the limiting state of the pressure reducing sleeve (8).

2. An automatic injection device with drag reduction function according to claim 1, characterized in that: The top of the upper outer shell (3) is movably mounted with a top cap button (1), and the top of the injection push rod (10) is provided with a Y-shaped elastic bracket (10-1) that passes through the pressure reducing sleeve (8). The bottom of the top cap button (1) at the opening of the Y-shaped elastic bracket (10-1) is equipped with a locking tongue (1-3).

3. An automatic injection device with drag reduction function according to claim 1, characterized in that: The injection push rod (10) is equipped with guide posts (10-3) on both sides, and a lever (10-6) is provided on the guide post (10-3). The top surface of the reset guide sleeve (13) is provided with an unlocking slope (13-4) corresponding to the guide post (10-3).

4. An automatic injection device with drag reduction function according to claim 3, characterized in that: The reset guide sleeve (13) is provided with a positioning post (13-3) on its side, and a latch (5-4) corresponding to the positioning post (13-3) is provided on the outer side of the top of the window (5). A crossbar (5-5) is provided on the window (5) on one side of the latch (5-4).

5. An automatic injection device with drag reduction function according to claim 1, characterized in that: The outer surface of the upper shell (3) is provided with a label (4), the window (5) is provided with an inner liner (5-1) corresponding to the syringe (15), and the reset spring (14) is sleeved on the inner liner (5-1).

6. An automatic injection device with drag reduction function according to claim 1, characterized in that: The bottom inner side of the upper outer shell (3) is provided with a guide groove (3-4), the top inner side of the upper outer shell (3) is provided with an upper hanging platform (3-5), and the lower surface of the upper hanging platform (3-5) is provided with a hanging platform bottom surface (306).

7. An automatic injection device with drag reduction function according to claim 1, characterized in that: The pressure-reducing sleeve (8) has guide grooves (803) on both sides, and a fixing ring (11) is provided at the bottom of the pressure-reducing sleeve (8) to limit the position of the syringe (15).

8. An automatic injection device with drag reduction function according to claim 1, characterized in that: The syringe (15) is provided with a syringe needle (17) at the bottom, and a needle sheath (18) is tightly fitted on the syringe needle (17).

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