Outer sleeve locking structure and automatic injection pen thereof

Abstract

The utility model relates to a kind of outer sleeve locking structure and its automatic injection pen, wherein, outer sleeve locking structure, including outer sleeve, top cover, unlock excitation sleeve;The upper portion of the inside of outer sleeve is equipped with the limiting edge of arc and symmetry along barrel cavity inner wall arrangement;In the low of the arc line of limiting edge, upper is equipped with fixed groove;The bottom of the cover of top cover is symmetric arc, forms limiting bottom;The arc surface of cover forms the fixed part of elastic deformation in two sides;In fixed part, outward protruding, form locking hook;The locking hook is inserted into the fixed groove;The inner wall of top cover is inward protruding, forms locking platform;Unlock excitation sleeve top wall surface is equipped with locking hook, and the bottom surface of locking hook is outward protruding locking surface.The automatic injection pen includes the outer sleeve locking structure of the utility model.The utility model improves safety reliability by the improvement of locking structure between top cover and outer sleeve, and the improvement of locking structure between top cover and unlock excitation sleeve.

Description

Technical Field

[0001] This utility model relates to the outer sleeve assembly structure in an automatic injection pen, particularly the assembly and locking structure of the outer sleeve assembly itself, as well as the structure for locking the unlocking trigger sleeve, and an automatic injection pen using this structure, belonging to the field of medical syringes. Background Technology

[0002] The existing automatic injection pen structure is referenced to the automatic injection pen with Chinese patent publication number CN116392673A, the automatic injection device for pre-filled syringe with Chinese patent publication number CN118477233A, the automatic injection pen with Chinese patent publication number CN119524265A, the automatic injection pen with Chinese patent publication number CN118807033A, and the automatic injection pen with Chinese patent publication number CN113499513A.

[0003] The automatic injection pen has an axially sliding unlocking and activation sleeve inside its outer sleeve. Before use, the bottom of the unlocking and activation sleeve protrudes outside the bottom of the outer sleeve assembly. By pressing the bottom of the unlocking and activation sleeve, the internal components are unlocked and activated. After unlocking and activation, the unlocking and activation sleeve needs to be fixed in position. This ensures that the operator is aware that the automatic injection pen has been used, preventing misuse, and also prevents the unlocking and activation sleeve from being in a free state and colliding with other components during subsequent processing, causing internal parts to scatter and affecting the stability of the internal state.

[0004] Therefore, to ensure the automatic injection pen's unlocking and triggering sleeve remains in place after unlocking and triggering, it is necessary to improve the internal structure of the automatic injection pen in order to conveniently and reliably fix the unlocking and triggering sleeve, thereby improving the safety and reliability of the automatic injection pen. Utility Model Content

[0005] The purpose of this utility model is to provide an outer sleeve locking structure and its automatic injection pen. The locking structure between the top cover, the outer sleeve, and the unlocking activation sleeve is improved so that the top cover is reliably connected to the top of the outer sleeve to seal the outer sleeve. At the same time, when the unlocking activation sleeve completes the unlocking activation, it is reliably locked by the top cover to prevent subsequent displacement and improve the safety and reliability of the automatic injection pen.

[0006] To achieve the above-mentioned utility model objectives, the first aspect of this utility model provides an outer sleeve locking structure, including an outer sleeve, a top cover, and an unlocking trigger sleeve;

[0007] The outer sleeve has a cylindrical body, the inside of which is a cylindrical cavity; the upper part of the inner side of the outer sleeve is provided with an arc-shaped and symmetrical limiting edge along the inner wall of the cylindrical cavity;

[0008] A fixing groove is provided above the lower part of the arc of the limiting edge;

[0009] The top cover has a cover body and a top cover; the cover body can be inserted into the top of the outer sleeve cavity;

[0010] The bottom of the top cover is symmetrically arc-shaped, forming a limiting bottom, and the shape of the limiting bottom matches that of the limiting edge;

[0011] The curved surface of the cover forms elastically deformable fixing parts on both sides; on the fixing parts, outward protrusions form locking hooks;

[0012] The locking hook is inserted into the fixing groove;

[0013] The inner wall of the top cover protrudes inward to form a locking platform;

[0014] The top wall of the unlocking trigger sleeve is provided with a locking hook, and the bottom surface of the locking hook is an outwardly protruding locking surface;

[0015] After the unlocking activation sleeve is activated, the locking hook moves above the locking platform of the top cover, and the locking surface is engaged above the locking platform; the locking surface and the locking platform are axially aligned.

[0016] As a further improvement of this utility model, the wall surface of the cavity where the arc-shaped height of the limiting edge of the outer sleeve is located protrudes inward to form a limiting platform; the top of the arc-shaped surface of the top cover abuts against the limiting platform.

[0017] As a further improvement of this utility model, the fixing groove of the outer sleeve is further recessed outward along the wall of the cylinder cavity to form a positioning groove.

[0018] The locking hook of the top cover protrudes outward to form a positioning protrusion;

[0019] The positioning protrusion matches the positioning groove.

[0020] Furthermore, the top of the positioning groove is provided with a funnel-shaped inlet.

[0021] As a further improvement of this utility model, the bottom of the locking hook of the top cover is an inclined insertion slope.

[0022] As a further improvement of this utility model, the locking hook of the top cover and the locking platform are located in the same position.

[0023] As a further improvement of this utility model, the top of the locking hook of the unlocking excitation sleeve is connected to the top of the locking excitation sleeve, and the other three sides of the locking hook are hollowed out to form a hollow cavity; the locking hook is an elastic hook that can be elastically deformed at the bottom.

[0024] Furthermore, an inclined locking guide surface is provided below the locking platform of the top cover.

[0025] Furthermore, an inclined elastic guide surface is provided above the locking surface of the locking hook of the unlocking trigger sleeve.

[0026] As a further improvement of this utility model, the area above the locking platform of the top cover is a clearance space;

[0027] Allow space to penetrate the wall of the top cover.

[0028] As a further improvement of this utility model, a limiting protrusion is provided above the locking platform of the top cover;

[0029] The limiting protrusion protrudes inward along the wall of the top cover, matching the top outer dimensions of the unlocking trigger sleeve.

[0030] A second aspect of this utility model provides an automatic injection pen, including the outer sleeve locking structure as described above;

[0031] The outer sleeve contains the injection components and a pre-filled syringe;

[0032] The unlocking sleeve moves upward along the axis of the outer sleeve, unlocking the injection component. The spring releases its elastic force, pushing out the reagent in the pre-filled syringe for injection.

[0033] The unlocking trigger sleeve is locked inside the outer sleeve assembly, which consists of the outer sleeve and the top cover.

[0034] The outer sleeve locking structure and its automatic injection pen of this utility model improve the locking structure between the top cover and the outer sleeve, as well as the locking structure between the top cover and the unlocking activation sleeve. This allows the top cover to be reliably installed on the top of the outer sleeve, sealing the top of the outer sleeve. At the same time, after the unlocking activation sleeve is unlocked and activated, it can be locked by the top cover. The locking process has almost no impact on the unlocking activation process of the unlocking activation sleeve. After locking, the position of the unlocking activation sleeve is stable and reliable, ultimately improving the safety and reliability of the automatic injection pen of this utility model. Attached Figure Description

[0035] Figure 1 This is an overall external view of the automatic injection pen of this utility model before use;

[0036] Figure 2 This is a schematic diagram of the overall structure of the outer sleeve of this utility model;

[0037] Figure 3 This is a partially enlarged structural schematic diagram of the outer sleeve of this utility model;

[0038] Figure 4 This is a schematic diagram of the overall structure of the top cover of this utility model. Figure 1 ;

[0039] Figure 5 This is a schematic diagram of the overall structure of the top cover of this utility model. Figure 2 ;

[0040] Figure 6 This is a partial cross-sectional view of the top cover of this utility model;

[0041] Figure 7 A schematic diagram of the structure for assembling the top cover to seal the outer sleeve;

[0042] Figure 8 for Figure 7 Schematic diagram of local structure of the state Figure 1 ;

[0043] Figure 9 for Figure 7 Schematic diagram of local structure of the state Figure 2 ;

[0044] Figure 10 This is a schematic diagram of the overall structure of the unlocking and triggering sleeve of this utility model;

[0045] Figure 11 for Figure 10 Schematic diagram of local structure Figure 1 ;

[0046] Figure 12 for Figure 10 Schematic diagram of local structure Figure 2 ;

[0047] Figure 13 A schematic diagram of the structure for locking the top cover to the unlocking trigger sleeve;

[0048] Figure 14 Schematic cross-section of a portion of the structure used to unlock the excitation sleeve locked within the outer sleeve assembly. Figure 1 ;

[0049] Figure 15 Schematic cross-section of a portion of the structure used to unlock the excitation sleeve locked within the outer sleeve assembly. Figure 2 . Detailed Implementation

[0050] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0051] This utility model relates to an outer sleeve locking structure and an automatic injection pen using the structure; the specific structure and operating principle of the automatic injection pen can be found in the automatic injection pen with Chinese Patent Publication No. CN116392673A.

[0052] Automatic injection pen, including the outer sleeve assembly, roughly as follows: Figure 1As shown, it is located on the outside of the entire injection pen, protecting the internal structure; the outer sleeve assembly is made of, for example, Figure 2 , Figure 3 The outer sleeve 1 shown, and as shown Figure 4 , Figure 5 , Figure 6 The top cover 2 shown is composed of the outer sleeve assembly, which is provided with the following: Figure 10 The unlocking trigger sleeve 3 is shown.

[0053] In a first aspect, the locking structure between the outer sleeve 1 and the top cover 2 is improved.

[0054] The outer sleeve 1 has a cylindrical body 11, and the interior of the cylindrical body 11 is a vertically penetrating cavity 12 for installing the internal structural components of the automatic injection pen.

[0055] The upper part (near the top) of the inner side of the outer sleeve 1 is provided with a limiting edge 13 that is arc-shaped along the inner wall of the cylinder cavity 12; the limiting edge 13 is symmetrically arranged.

[0056] At the height of the arc of the limiting edge 13, the wall of the cylinder cavity 12 protrudes inward to form the limiting platform 14.

[0057] A fixing groove 15 is provided above the lower part of the arc of the limiting edge 13.

[0058] At the fixed groove 15, a positioning groove 16 is formed by further recessing outward along the wall of the cylindrical cavity 12; the top of the positioning groove 16 is provided with a funnel-shaped inlet 162.

[0059] The top cover 2 has a cover body 21 and a top cover 22; the cover body 21 can be inserted into the top of the cavity 12 of the outer sleeve 1 to seal the top of the outer sleeve 1.

[0060] The bottom of the cover body 21 of the top cover 2 is symmetrically arc-shaped, forming a limiting bottom 23 that matches the shape of the limiting edge 13.

[0061] Since the cover 21 is arc-shaped, it forms two large fixing parts. The fixing parts can elastically deform inward, and the smaller area is the weak point of the structure, which can accommodate the amount of elastic deformation. On the fixing parts, it protrudes outward to form a locking hook 24. The bottom of the locking hook 24 is an inclined insertion slope 242. Furthermore, the outside of the locking hook 24 protrudes outward to form a positioning protrusion 25. The size of the positioning protrusion 25 matches the width of the positioning groove 16.

[0062] like Figure 7 , Figure 8 , Figure 9As shown, when the top cover 2 is inserted into the top of the outer sleeve 1 for sealing, the locking hook 24 is aligned with the position of the fixing groove 15, and the insertion inclined surface 242 contacts the top opening of the cylinder cavity 12, applying downward pressure to install the top cover 2. This causes the fixing parts on both sides of the top cover 2, where the locking hook 24 is located, to elastically deform inward, allowing the cover body 21 of the top cover 2 to be inserted into the cylinder cavity 12. Subsequently, the positioning protrusion 25 is inserted into the positioning groove 16 through the inlet 162 to ensure that the locking hook 24 and the fixing groove 15 are aligned. Finally, the top cover 2 is installed in place on the top of the outer sleeve 1. At this time, the arc of the limiting bottom 23 of the top cover 2 and the limiting edge 13 of the outer sleeve 1 are aligned. The arc shape matches and contacts the top cover 21. The smaller area of ​​the top cover 21 abuts against the limiting platform 14. The combination of the limiting bottom 23 and the limiting edge 13, as well as the combination of the smaller area of ​​the top cover 21 and the limiting platform 14, limits the downward movement of the top cover 21. At the same time, the locking hook 24 smoothly engages in the fixing groove 15. The locking hook 24 hooks the top edge of the fixing groove 15, limiting the upward movement of the top cover 21. The vertical movement of the top cover 21 is limited, and due to the combination of the limiting bottom 23 and the limiting edge 13, the axial movement of the top cover 21 is also limited. Thus, the top cover 21 is fully and reliably fixed to the top of the outer sleeve 1.

[0063] In a second aspect, the locking structure between the top cover 2 and the unlocking trigger sleeve 3 is improved.

[0064] The top cover 2, using the location of the locking hook 24, causes the wall surface to bulge inward to form a locking platform 27, and an inclined locking guide surface 272 is provided below the locking platform 27.

[0065] In a further preferred embodiment, the space above the locking platform 27 is a clearance space 26; the clearance space 26 can penetrate the wall of the cover 21 of the top cover 2, so that the cover 21 is open to the inside and outside of the clearance space 26.

[0066] In a further preferred embodiment, the locking platform 27 is provided with a limiting protrusion 28 above the clearance space 26, and the limiting protrusion 28 protrudes inward, which is almost equivalent to the inward protrusion of the locking platform 27.

[0067] The unlocking sleeve 3 has a locking hook 33 on its top wall surface; the top of the locking hook 33 is connected to the top of the locking sleeve 3, and the other three sides are hollowed out to form a hollow cavity 34, so that the locking hook 33 is an elastic hook that can be elastically deformed at the bottom.

[0068] The bottom surface of the locking hook 33 is an outwardly protruding locking surface 35.

[0069] Preferably, an inclined elastic guide surface 36 is provided above the locking surface 35.

[0070] like Figure 13 , Figure 14 , Figure 15 As shown, when the unlocking trigger sleeve 3 is activated, it moves upward along the axis of the outer sleeve 1, causing the top of the unlocking trigger sleeve 3 to enter the top cover 2 and lock with it. During this process, the lower middle part of the locking hook 33 contacts the locking platform 27, especially the locking guide surface 272 and the elastic guide surface 36. The two inclined surfaces contact each other, converting the axial force into a horizontal force, causing the locking hook 33 to elastically deform inward until the locking hook 33 completely passes over the locking platform 27 and reaches above the locking platform 27. The locking surface 35 and the locking platform 27 overlap axially, that is... This causes the unlocking trigger sleeve 3 to be locked by the top cover 2. Due to the existence of the clearance space 26, the locking surface 35 of the locking hook 33 can protrude outward more and be inserted into the clearance space 26 on the wall of the cover 21, so that the axial overlap between the locking surface 35 and the locking platform 27 is greater, resulting in a better locking effect. At the same time, the axial rotation limit of the unlocking trigger sleeve 3 is achieved by the locking hook 33 being inserted into the clearance space 26 on the wall of the cover 21. Meanwhile, the top of the unlocking trigger sleeve 3 abuts against the limit protrusions 28, preventing the unlocking trigger sleeve 3 from shaking and preventing the locking from failing.

[0071] The preferred embodiments of this utility model have been described in detail above, but this utility model is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An outer sleeve locking structure, characterized in that, Includes outer sleeve, top cover, and unlocking activation sleeve; The outer sleeve has a cylindrical body, the inside of which is a cylindrical cavity; the upper part of the inner side of the outer sleeve is provided with an arc-shaped and symmetrical limiting edge along the inner wall of the cylindrical cavity; A fixing groove is provided above the lower part of the arc of the limiting edge; A lid, comprising a cover body and a top cover; The cover can be inserted into the top of the outer sleeve cavity; The bottom of the top cover is symmetrically arc-shaped, forming a limiting bottom, and the shape of the limiting bottom matches that of the limiting edge; The curved surface of the cover forms elastically deformable fixing parts on both sides; on the fixing parts, outward protrusions form locking hooks; The locking hook is inserted into the fixing groove; The inner wall of the top cover protrudes inward to form a locking platform; The top wall of the unlocking trigger sleeve is provided with a locking hook, and the bottom surface of the locking hook is an outwardly protruding locking surface; After the unlocking activation sleeve is activated, the locking hook moves above the locking platform of the top cover, and the locking surface is engaged above the locking platform; the locking surface and the locking platform are axially aligned.

2. The outer sleeve locking structure as described in claim 1, characterized in that, The wall of the cavity where the arc-shaped height of the limiting edge of the outer sleeve is located protrudes inward to form a limiting platform; the top of the arc-shaped surface of the top cover abuts against the limiting platform.

3. The outer sleeve locking structure as described in claim 1, characterized in that, The fixing groove of the outer sleeve is further recessed outward along the wall of the sleeve cavity, and a positioning groove is provided there; The locking hook of the top cover protrudes outward to form a positioning protrusion; The positioning protrusion matches the positioning groove.

4. The outer sleeve locking structure as described in claim 1, characterized in that, The locking hook of the top cover is located in the same position as the locking platform.

5. The outer sleeve locking structure as described in claim 1, characterized in that, The top of the locking hook of the unlocking trigger sleeve is connected to the top of the locking trigger sleeve, and the other three sides of the locking hook are hollowed out to form a hollow cavity; the locking hook is an elastic hook that can be elastically deformed at the bottom.

6. The outer sleeve locking structure as described in claim 5, characterized in that, The top cover has an inclined locking guide surface below the locking platform.

7. The outer sleeve locking structure as described in claim 5 or 6, characterized in that, An inclined elastic guide surface is provided above the locking surface of the locking hook of the unlocking trigger sleeve.

8. The outer sleeve locking structure as described in claim 1, characterized in that, Above the locking platform of the top cover is a clearance space; Allow space to penetrate the wall of the top cover.

9. The outer sleeve locking structure as described in claim 1, characterized in that, A limiting protrusion is provided above the locking platform of the top cover; The limiting protrusion protrudes inward along the wall of the top cover, matching the top outer dimensions of the unlocking trigger sleeve.

10. An automatic injection pen, characterized in that, Includes the outer sleeve locking structure as described in any one of claims 1-9; The outer sleeve contains the injection components and a pre-filled syringe; The unlocking sleeve moves upward along the axis of the outer sleeve, unlocking the injection component. The spring releases its elastic force, pushing out the reagent in the pre-filled syringe for injection. The unlocking trigger sleeve is locked inside the outer sleeve assembly, which consists of the outer sleeve and the top cover.

Images