A manually locking insulin injection needle

Abstract

A kind of manually locked insulin injection needle, including needle seat, needle body, front sleeve and spring, it is characterized in that: rotating positioning locking structure is mainly by being arranged on the axial first positioning surface and the circumferential first positioning surface of needle seat and being arranged on the axial second positioning surface and the circumferential second positioning surface of front sleeve constitute.In front sleeve relative to needle seat is in front end limit position, manually rotate front sleeve, when the circumferential second positioning surface on front sleeve is positioned with the circumferential first positioning surface on needle seat, the axial second positioning surface on front sleeve and the axial first positioning surface on needle seat face to face, to this will front sleeve be positioned and locked on needle seat and form the safety protection of needle for needle body front end needle tip.The present scheme solves the safety hidden trouble problem existing in the prior art manually safety-protected pancreatic injection needle.

Description

Technical Field

[0001] This invention relates to medical insulin injection tools, and more particularly to a manually locking insulin injection needle. This needle is used in conjunction with an insulin pen for self-administration or administration to others. The insulin pen is reusable, while the injection needle is a single-use needle. The key feature of this invention is the manual locking mechanism that provides safety protection for the needle tip after use. It is simple in structure, low in cost, and safe and reliable. Background Technology

[0002] Diabetes is a metabolic disease characterized by high blood sugar. There is currently no cure, but injecting insulin can effectively control the condition.

[0003] Insulin injection tools come in various forms. Common insulin injection tools consist of an insulin needle and an insulin pen used together. The insulin pen carries a prescribed amount of liquid insulin and is reusable, while the insulin needle is a single-use needle. Traditional insulin needles consist of a needle body and a needle hub that are fixedly connected. Although simple in structure and low in cost, the lack of a safety device exposes the needle tip, posing a risk of accidental finger injury and cross-infection. To address the safety issues of traditional insulin needles, those skilled in the art have designed various insulin needles with safety sheaths. These products are generally divided into two categories: manually protected insulin needles and automatically protected insulin needles. Automatically protected products are often complex in structure and expensive, belonging to high-end medical consumables. Manually protected products fall between traditional and high-end products, with a relatively simple structure and low cost, making them popular safety products among consumers.

[0004] Chinese patent CN215024119U published a utility model patent on December 7, 2021, entitled "An Automatic Retraction Protective Insulin Needle," with patent application number 202120554224.2. While the patent is titled "An Automatic Retraction Protective Insulin Needle," the specification reveals it to be a manually operated, safety-protected insulin injection needle, requiring manual operation for safety protection. Although this patented manual safety-protected insulin injection needle has a simple structure and relatively low cost, it suffers from a drawback: the protective cap only relies on spring force to protect the needle and is not locked. Pressing or touching the cap can still force it to move and disengage the protective mechanism, posing a safety hazard from a safety perspective.

[0005] Therefore, how to improve the existing manual safety protection islet injection needle, while retaining its advantages such as simple structure and low cost, and overcoming its shortcomings in safety, is the key issue considered in this invention. Summary of the Invention

[0006] This invention provides a manually locking insulin injection needle, the purpose of which is to solve the safety hazards of existing manually locked insulin injection needles.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a manually locking insulin injection needle, comprising:

[0008] The needle hub has a positioning post at the front and an interface for connecting an insulin pen at the rear.

[0009] The needle body has an injection section at the front end and a connecting section at the rear end. The needle body is fixed on the positioning post. The injection section extends forward from the front end of the positioning post, and the connecting section extends from the rear end of the positioning post into the interface.

[0010] The front cannula is used to protect the injection section of the needle body. The main structure of the front cannula is a tube body. The front cannula and the needle hub are axially slidingly engaged. The front cannula has a front end limiting position relative to the needle hub in the sliding direction. At the front end limiting position, the front cannula and the needle hub are circumferentially rotating.

[0011] Its innovation lies in the following: the needle holder is provided with an axial first positioning surface, which faces axially forward; corresponding to the axial first positioning surface, an axial second positioning surface is provided on the front sleeve, which faces axially rearward. The center of the axial first positioning surface and the center of the axial second positioning surface are located on the path of the front sleeve with the same rotation radius relative to the needle holder.

[0012] The needle holder has a circumferential first positioning surface, which faces either the clockwise or counterclockwise rotation direction. Corresponding to the circumferential first positioning surface, a circumferential second positioning surface is provided on the front sleeve, which faces either the clockwise or counterclockwise rotation direction. The center of the circumferential first positioning surface and the center of the circumferential second positioning surface are located on the path of the front sleeve with the same rotation radius relative to the needle holder.

[0013] In the assembled state, the phase difference between the center of the axial first positioning surface and the center of the axial second positioning surface in the circumferential direction is equal to the phase difference between the center of the circumferential first positioning surface and the center of the circumferential second positioning surface.

[0014] When the front sleeve is in the front limiting position relative to the needle seat, manually rotate the front sleeve. When the circumferential second positioning surface on the front sleeve contacts and positions itself with the circumferential first positioning surface on the needle seat, the axial second positioning surface on the front sleeve faces the axial first positioning surface on the needle seat, thereby locking the front sleeve on the needle seat and forming a safety protection for the needle tip at the front end of the needle body.

[0015] The relevant content in the above technical solution is explained as follows:

[0016] 1. In the above scheme, "front," "before," "front," "forward," and "before" in "front end," "front part," "forward," and "before" refer to the direction pointed to by the needle tip of the injection segment of the safe insulin injection needle of the present invention. "Rear," "rear part," and "rear" refer to the opposite direction of "front."

[0017] 2. In the above-described embodiment, the insulin injection needle may further include an outer sleeve, which is a sleeve structure that covers the needle hub and the front cannula to protect the entire insulin injection needle. In this invention, since the outer sleeve is irrelevant to the innovation, it is omitted in the text description and accompanying drawings. This invention may also include a tail cap to protect the needle body connecting section. Since the tail cap is irrelevant to the innovation of this invention, it is omitted in the text description and accompanying drawings. This is also the reason for the open-ended statement in the claims.

[0018] 3. In the above scheme, a transition surface is provided for the first axial positioning surface and / or the second axial positioning surface. The transition surface is an inclined surface or an arc surface. The transition surface is located next to the first axial positioning surface and / or the second axial positioning surface and is connected to the first axial positioning surface and / or the second axial positioning surface. The center of the transition surface is on the same path with the center of the first axial positioning surface or the center of the second axial positioning surface, which is on the same rotation radius.

[0019] When the first axial positioning surface and the second axial positioning surface are misaligned in the circumferential direction, the center of the first axial positioning surface and the center of the second axial positioning surface are projected in the axial direction and their positions are staggered. Moreover, the length of the staggered position falls within the projected length of the transition surface in the axial direction. In this state, when the front sleeve is manually rotated, the second axial positioning surface on the front sleeve rises through the transition surface to a face-to-face pressing state with the first axial positioning surface on the needle seat. At the same time, the second circumferential positioning surface contacts and positions itself with the first circumferential positioning surface.

[0020] 4. In the above scheme, the circumferential first positioning surface is located next to the axial first positioning surface and forms an angle with the axial first positioning surface. The center of the circumferential first positioning surface and the center of the axial first positioning surface are on the same path with the same radius of rotation. The axial projection position of the center of the circumferential first positioning surface is located in front of the axial projection position of the center of the axial first positioning surface.

[0021] The circumferential second positioning surface is located next to the axial second positioning surface and forms an angle with it. The center of the circumferential second positioning surface and the center of the axial second positioning surface are on the same path with the same radius of rotation. The axial projection position of the center of the circumferential second positioning surface is located in front of the axial projection position of the center of the axial second positioning surface.

[0022] 5. In the above scheme, the needle seat is provided with a locking groove, which is a groove structure facing forward. The axial first positioning surface is the bottom surface of the locking groove, and the circumferential first positioning surface is the side surface of the locking groove. The front sleeve is provided with a locking post, which is a protruding structure facing rearward. The axial second positioning surface is the top surface of the locking post, and the circumferential second positioning surface is the side surface of the locking post. The transition surface is located on the outside of the locking groove and / or the side of the locking post.

[0023] 6. In the above scheme, the locking groove is located on the front end face of the positioning post of the needle seat. The inner wall of the front sleeve is provided with an inner ring protruding towards the center, and the locking post sits on the inner ring and faces rearward.

[0024] 7. In the above scheme, the needle seat is provided with a locking post, which is a protruding structure facing forward. The axial first positioning surface is the top surface of the locking post, and the circumferential first positioning surface is the side surface of the locking post. The front sleeve is provided with a locking groove, which is a recessed structure facing rearward. The axial second positioning surface is the bottom surface of the locking groove, and the circumferential second positioning surface is the side surface of the locking groove. The transition surface is located on the outside of the locking groove and / or the side of the locking post.

[0025] 8. In the above scheme, the inner wall of the front sleeve is provided with an inner ring protruding towards the center, and the locking groove is provided on the inner ring. The locking post is provided on the front end face of the positioning post of the needle seat.

[0026] 9. In the above scheme, the periphery of the positioning post is provided with an extension sleeve, which is a sleeve structure. The sleeve is coaxial with the positioning post and is integrally formed with the positioning post. The front sleeve and the extension sleeve are axially slidingly fitted and circumferentially rotating fitted.

[0027] 10. In the above scheme, the rear part of the front sleeve is inserted into the extension sleeve, the outer edge of the front sleeve is provided with an outer edge retaining ring, and the inner edge of the extension sleeve is provided with an inner edge retaining ring. When the front sleeve slides forward relative to the extension sleeve, the inner edge retaining ring and the outer edge retaining ring cooperate to form the front end limiting position.

[0028] 11. In the above scheme, the needle holder is provided with a first stepped surface, the first stepped surface including a front and a side, the axial first positioning surface being the front of the first stepped surface, and the circumferential first positioning surface being the side of the first stepped surface. The front sleeve is provided with a second stepped surface, the second stepped surface including a front and a side, the axial second positioning surface being the front of the second stepped surface, and the circumferential second positioning surface being the side of the second stepped surface. The transition surface is provided on the side of the first stepped surface and / or the side of the second stepped surface.

[0029] The design principle and technical concept of this invention are as follows: To address the safety hazards of existing manually operated pancreatic injection needles, this invention, based on existing technology, designs a rotational positioning and locking structure between the needle hub and the front cannula. This structure mainly consists of an axial first positioning surface and a circumferential first positioning surface on the needle hub, and an axial second positioning surface and a circumferential second positioning surface on the front cannula. When the front cannula is in the front-end limiting position relative to the needle hub, manually rotating the front cannula causes the circumferential second positioning surface on the front cannula to contact and position itself with the circumferential first positioning surface on the needle hub. Simultaneously, the axial second positioning surface on the front cannula and the axial first positioning surface on the needle hub face to face, thereby locking the front cannula onto the needle hub and providing safety protection for the needle tip.

[0030] Due to the application of the above-mentioned solution, the present invention has the following advantages and effects compared with the prior art:

[0031] 1. Simple structure. Compared with the prior art (comparative document in the background), the present invention does not add any parts or molds, but adds a locking function in the protected state through structural improvement, which further improves the safety of insulin injection needles and eliminates the safety hazards existing in the prior art.

[0032] 2. Ingenious Design. This invention utilizes the rotational engagement between the front sleeve and the needle holder in the front limiting position to design a simple and reliable rotational positioning and locking structure between the needle holder and the front sleeve. This cleverly solves the safety issue raised in this invention. Although the rotational positioning and locking structure of this invention is not complex, its effect is significant and it possesses substantial characteristics.

[0033] 3. More convenient to use. This invention can be used directly, and after use, simply rotate the front cannula to lock it. In contrast, the insulin injection needle in the comparison document requires pulling down the protective cap and rotating it to fix it before use, and then rotating it back to release the fixation after use to separate the protective cap.

[0034] 4. More effective protection. After use, rotating the front cannula of this invention locks it in place, thus providing effective protection. In contrast, the protective cap on the insulin injection needle in the prior art is only a false protection; it can still cause injury if touched, posing a safety hazard.

[0035] 5. Features a locking prompt sound. When the axial second positioning surface on the front cannula of this invention rises past the transition surface to face-to-face with the axial first positioning surface on the needle hub (see Example 1), a prompt sound will play to indicate that it has entered the locking state. The insulin injection needle in the prior art does not have this effect. Attached Figure Description

[0036] Appendix Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0037] Appendix Figure 2 This is an exploded perspective view of Embodiment 1 of the present invention;

[0038] Appendix Figure 3 This is a perspective view of the front sleeve from the rear end of Embodiment 1 of the present invention;

[0039] Appendix Figure 4 for Figure 3 A magnified view of a portion at point F;

[0040] Appendix Figure 5 This is a perspective view of the front sleeve from the front end of Embodiment 1 of the present invention;

[0041] Appendix Figure 6 This is a perspective view of the needle holder in Embodiment 1 of the present invention;

[0042] Appendix Figure 7 This is the initial state front view of Embodiment 1 of the present invention;

[0043] Appendix Figure 8 for Figure 7 AA section view;

[0044] Appendix Figure 9 This is a perspective view of the initial state of Embodiment 1 of the present invention;

[0045] Appendix Figure 10 This is a perspective view of the front sleeve in the fully depressed state in Embodiment 1 of the present invention;

[0046] Appendix Figure 11 This is a perspective view of the sleeve before rotation in Embodiment 1 of the present invention;

[0047] Appendix Figure 12 This is a three-dimensional sectional view of the sleeve before rotation in Embodiment 1 of the present invention;

[0048] Appendix Figure 13a This is a perspective view of the front sleeve in the locked state according to Embodiment 1 of the present invention;

[0049] Appendix Figure 13b This is a cross-sectional view of the front sleeve in the locked state according to Embodiment 1 of the present invention;

[0050] Appendix Figure 14 This is a schematic diagram illustrating the principle of the intersecting axial first positioning surface and axial second positioning surface in Embodiment 1 of the present invention.

[0051] Appendix Figure 15 This is a perspective view of Embodiment 2 of the present invention;

[0052] Appendix Figure 16 This is an exploded perspective view of Embodiment 2 of the present invention;

[0053] Appendix Figure 17 This is a perspective view of the front sleeve of Embodiment 2 of the present invention;

[0054] Appendix Figure 18 for Figure 17 A magnified view of part of G;

[0055] Appendix Figure 19 This is a perspective view of the needle holder in Embodiment 2 of the present invention;

[0056] Appendix Figure 20 for Figure 19 A magnified view of H portion;

[0057] Appendix Figure 21 This is the initial state front view of Embodiment 2 of the present invention;

[0058] Appendix Figure 22 for Figure 21 BB section view;

[0059] Appendix Figure 23 This is a perspective view of the front sleeve in the locked state according to Embodiment 2 of the present invention;

[0060] Appendix Figure 24 for Figure 23 CC-shaped sectional view;

[0061] Appendix Figure 25 This is a perspective view of the initial state of Embodiment 2 of the present invention;

[0062] Appendix Figure 26 for Figure 25 A magnified view of a portion of the image;

[0063] Appendix Figure 27 This is a perspective view of the front sleeve in the fully depressed state in Embodiment 2 of the present invention;

[0064] Appendix Figure 28 for Figure 27 A magnified view of a portion of the image;

[0065] Appendix Figure 29 This is a perspective view of the front sleeve locking state in Embodiment 2 of the present invention.

[0066] Appendix Figure 30 for Figure 29 A magnified view of a portion of the image;

[0067] Appendix Figure 31 This is an exploded perspective view of Embodiment 3 of the present invention;

[0068] Appendix Figure 32 This is a perspective view of the front sleeve in Embodiment 3 of the present invention.

[0069] In the above figures: 1. Needle seat; 2. Front sleeve; 3. Spring; 4. Needle body; 5. Positioning post; 6. Interface; 7. Axial first positioning surface; 8. Axial second positioning surface; 9. Transition surface; 10. Circumferential first positioning surface; 11. Circumferential second positioning surface; 12. Locking post; 13. Inner ring; 14. Outer edge retaining ring; 15. Extension sleeve; 16. Inner edge retaining ring; 17. Locking groove; 18. First stepped surface; 19. Second stepped surface; 20. Support piece; 21. Guide rib; 22. Guide groove; 23. Positioning groove; 24. Limiting groove; 25. Limiting post; S1. Interlaced length; S2. Projected length. Detailed Implementation

[0070] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0071] Example 1: A manually locking insulin injection needle

[0072] like Figure 1-14 As shown, this manually locked insulin injection needle consists of a needle hub 1, a needle body 4, a front cannula 2, and a spring 3 (see...). Figure 1 and Figure 2 The components and their structures are as follows:

[0073] Needle holder 1, the front of which is provided with a positioning post 5 (see Figure 6 and Figure 8 The rear section has an interface 6 for connecting an insulin pen (see...). Figure 8 ).

[0074] Needle body 4, the front end of which is the injection section and the rear end is the connecting section, needle body 4 is fixed on positioning post 5 (see...). Figure 8 The injection segment extends forward from the front end of the positioning post 5, and the connecting segment extends from the rear end of the positioning post 5 into the interface 6 (see...). Figure 8 ).

[0075] Front cannula 2, which protects the injection section of needle body 4, has a main structure of tubular body (see...). Figure 3 and Figure 8 The front sleeve 2 and the needle seat 1 are axially slidingly fitted (see...). Figure 8 The front sleeve 2 has a front end limiting position relative to the needle seat 1 in the sliding direction (see...). Figure 8 The front sleeve 2 and the needle seat 1 rotate in a circumferential manner.

[0076] Spring 3, which is a helical spring and acts in the sliding direction between the front sleeve 2 and the needle seat 1 (see...) Figure 8 ).

[0077] The innovation of this invention lies in the design of a rotational positioning and locking structure between the needle hub 1 and the front sleeve 2. This rotational positioning and locking structure mainly consists of the following structure and construction:

[0078] The needle holder 1 is provided with an axial first positioning surface 7 (see...). Figure 6 The first axial positioning surface 7 faces axially forward. Corresponding to the first axial positioning surface 7, a second axial positioning surface 8 is provided on the front sleeve 2 (see...). Figure 4 The second axial positioning surface 8 faces axially rearward. The center of the first axial positioning surface 7 and the center of the second axial positioning surface 8 are located on the same rotation radius of the front sleeve 2 relative to the needle seat 1.

[0079] The needle holder 1 is provided with a circumferential first positioning surface 10 (see...). Figure 6 The first circumferential positioning surface 10 faces either the clockwise or counterclockwise rotation direction of the circumferential direction. Corresponding to the first circumferential positioning surface 10, a second circumferential positioning surface 11 is provided on the front sleeve 2 (see...). Figure 4 The second circumferential positioning surface 11 is oriented in either a counterclockwise or clockwise direction of circumferential rotation. The center of the first circumferential positioning surface 10 and the center of the second circumferential positioning surface 11 are located on the same rotation radius of the front sleeve 2 relative to the needle seat 1.

[0080] In the assembled state, the phase difference between the center of the axial first positioning surface 7 and the center of the axial second positioning surface 8 in the circumferential direction is equal to the phase difference between the center of the circumferential first positioning surface 10 and the center of the circumferential second positioning surface 11.

[0081] A transition surface 9 is provided for the axial second positioning surface 8. This transition surface 9 is an inclined surface (see...). Figure 4 The transition surface 9 is located beside and connected to the axial second positioning surface 8 (see...). Figure 4 The center of transition surface 9 and the center of the axial second positioning surface 8 are on the same path with the same radius of rotation (see...). Figure 4 ).

[0082] The circumferential first positioning surface 10 is located beside the axial first positioning surface 7 and forms an angle with the axial first positioning surface 7. The center of the circumferential first positioning surface 10 and the center of the axial first positioning surface 7 are on the same path with the same radius of rotation (see...). Figure 6 The center of the circumferential first positioning surface 10 is projected in front of the center of the axial first positioning surface 7.

[0083] The circumferential second positioning surface 11 is located beside the axial second positioning surface 8 and forms an angle with the axial second positioning surface 8. The center of the circumferential second positioning surface 11 and the center of the axial second positioning surface 8 are on the same path with the same radius of rotation (see...). Figure 4The center of the circumferential second positioning surface 11 is projected in front of the center of the axial second positioning surface 8.

[0084] Currently, sleeve 2 is in the front end limiting position relative to needle seat 1 (see...) Figure 8 Furthermore, the axial first positioning surface 7 and the axial second positioning surface 8 are misaligned in the circumferential direction, and the projection positions of the center of the axial first positioning surface 7 and the center of the axial second positioning surface 8 in the axial direction are staggered, and the staggered length S1 falls within the range of the projection length S2 of the transition surface 9 in the axial direction (see...). Figure 14 When the front sleeve 2 is manually rotated in this state, the axial second positioning surface 8 on the front sleeve 2 rises through the transition surface 9 to a face-to-face pressing state with the axial first positioning surface 7 on the needle seat 1, while the circumferential second positioning surface 11 contacts and positions itself with the circumferential first positioning surface 10.

[0085] In this invention, the transition surface 9 is a working inclined surface or arc surface when rotating and locking the front sleeve 2. Before locking, the front sleeve 2 is in a front-end limiting position relative to the needle seat 1, and the axial first positioning surface 7 and the axial second positioning surface 8 are misaligned circumferentially, while axially they are staggered. When rotating the front sleeve 2, the axial second positioning surface 8 on the front sleeve 2 rises through the transition surface 9 to press against the axial first positioning surface 7 on the needle seat 1. Therefore, the transition surface 9 enables the axial first positioning surface 7 and the axial second positioning surface 8 to transition from a misaligned state to a pressing state. In the pressing state, the front sleeve 2 cannot retract further relative to the needle seat 1, forcing the front sleeve 2 to enter a locked state relative to the needle seat 1.

[0086] In this embodiment, in the unlocked state, the axial first positioning surface 7 and the axial second positioning surface 8 are staggered in the axial direction. That is, in the locked state, the axial first positioning surface 7 is behind and the axial second positioning surface 8 is in front, facing each other. In the unlocked state, the axial first positioning surface 7 is in front and the axial second positioning surface 8 is behind, with a staggered length. This staggering is to ensure that in the locked state, the axial first positioning surface 7 and the axial second positioning surface 8 have a top pressure, which guarantees the reliability of the lock. This staggering amount is generally not too large; otherwise, it would be difficult for the axial second positioning surface 8 to climb over the transition surface 9 to reach the face-to-face pressure state with the axial first positioning surface 7. This is why the length of the staggered length is required to fall within the axial projection length of the transition surface 9. However, for this invention, such staggering is not necessary, and it is permissible without it.

[0087] In this embodiment, the needle holder 1 is provided with a locking groove 17 (see... Figure 6The locking groove 17 is a groove structure facing forward. The axial first positioning surface 7 is the bottom surface of the locking groove 17, and the circumferential first positioning surface 10 is the side surface of the locking groove 17 (see...). Figure 6 The front sleeve 2 is provided with a locking post 12 (see...). Figure 3 The locking post 12 is a protruding structure facing rearward. The axial second positioning surface 8 is the top surface of the locking post 12, and the circumferential second positioning surface 11 is the side surface of the locking post 12 (see...). Figure 4 The transition surface 9 is located on the side of the locking post 12 (see...). Figure 3 and Figure 4 The locking groove 17 is located on the front end face of the positioning post 5 of the needle seat 1 (see...). Figure 6 Furthermore, the locking slot 17 has two components and is arranged symmetrically in the circumferential direction (see...). Figure 6 The inner wall of the front sleeve 2 is provided with an inner ring 13 protruding towards the center (see...). Figure 3 Locking pin 12 is located on inner ring 13 and faces rearward (see) Figure 3 and Figure 8 Furthermore, the locking post 12 has two components, which are arranged symmetrically in the circumferential direction (see...). Figure 3 ).

[0088] In this embodiment, to ensure that the front sleeve 2 and the needle seat 1 have an axial sliding fit and a circumferential rotational fit, an extension sleeve 15 is provided around the positioning post 5 of the needle seat 1 (see...). Figure 6 and Figure 8 The extension sleeve 15 is a sleeve structure, coaxial with the positioning post 5, and integrally formed with the positioning post 5. The front sleeve 2 and the extension sleeve 15 are axially slidingly fitted and circumferentially rotating fitted. The rear part of the front sleeve 2 is inserted into the extension sleeve 15 (see...). Figure 8 The outer edge of the front sleeve 2 is provided with an outer edge retaining ring 14, and the inner edge of the extension sleeve 15 is provided with an inner edge retaining ring 16 (see...). Figure 8 When the current sleeve 2 slides forward relative to the extension sleeve 15, the inner edge retaining ring 16 and the outer edge retaining ring 14 cooperate to form the front end limiting position.

[0089] The usage process of Embodiment 1 of the present invention is described below with reference to the accompanying drawings:

[0090] 1. Initial State

[0091] Figure 7 This represents the initial state of the main view. Figure 8 This represents the initial state AA section view. Figure 9 A 3D diagram representing the initial state. From... Figure 8As can be seen, the front sleeve 2 is in the front limiting position, the inner edge retaining ring 16 on the inner edge of the extension sleeve 15 cooperates with the outer edge retaining ring 14 on the front sleeve 2, and the spring 3 presses against the axial direction of the front sleeve 2 and the needle seat 1. From Figure 9 As can be seen, in the initial state, the two locking slots 17 and the two locking pins 12 are misaligned in the circumferential direction. In the initial state, the first axial positioning surface 7 and the second axial positioning surface 8 are misaligned in the axial direction, that is, the first axial positioning surface 7 is in front and the second axial positioning surface 8 is behind. The first axial positioning surface 7 and the second axial positioning surface 8 are on the same path with the same radius of rotation, and they are not in the same orientation in the circumferential direction, that is, they are 90 degrees apart in the circumferential orientation.

[0092] 2. Front sleeve retracted state

[0093] Figure 10 This is a 3D view showing the front sleeve 2 in its fully depressed position during use. From... Figure 10 As can be seen, the front cannula 2 is in a retracted state relative to the needle hub 1, indicating that insulin has been injected into the patient. At this time, the two locking grooves 17 and the two locking pins 12 are staggered in the circumferential direction. After the injection is completed, the insulin injection needle is pulled out, and the front cannula 2 returns to its initial state under the action of the spring 3.

[0094] 3. Sleeve condition before rotation

[0095] Appendix 11 shows a three-dimensional view of the sleeve before rotation. Figure 12 A three-dimensional sectional view showing the state of the sleeve before rotation. Figure 11 The arrow in the image indicates the direction of rotation, from Figure 11 As can be seen, the position of the pair of locking slots 17 (two) relative to the pair of locking pins 12 (two) in the circumferential direction has changed. Specifically, the pair of locking pins 12 (two) are gradually approaching the pair of locking slots 17 (two), but are not yet locked. From... Figure 12 As can be seen from this, the front sleeve 2 is positioned relative to the needle seat 1 at the front end limit position. Figure 11 The arrow in the figure indicates the counterclockwise rotation direction. In this embodiment, it is also possible to rotate the front sleeve 2 clockwise, and the effect is the same as rotating the front sleeve 2 counterclockwise.

[0096] 4. Front sleeve locked state

[0097] Figure 13a A 3D view showing the front sleeve in the locked state. Figure 13b This is a cross-sectional view showing the front sleeve in a locked state. From... Figure 13a and Figure 13bAs can be seen, the locking pin 12 on the front sleeve 2 has been engaged in the locking groove 17, at which point the axial first positioning surface 7 and the axial second positioning surface 8 are in a pressing state. This also indicates that the axial first positioning surface 7 and the axial second positioning surface 8 have changed from being misaligned in the axial direction. When the front sleeve 2 is rotated, the axial second positioning surface 8 on the front sleeve 2 rises through the transition surface 9 to press against the axial first positioning surface 7 on the needle seat 1. At the same time, the circumferential second positioning surface 11 and the circumferential first positioning surface 10 are in contact and positioned, thereby locking the front sleeve 2 on the needle seat 1 and forming a safety protection for the needle tip at the front end of the needle body 4. It should be noted that: the axial first positioning surface 7 and the axial second positioning surface 8 have changed from being misaligned in the axial direction to pressing against each other. Elastic deformation has occurred between the front sleeve 2 and the needle seat 1. This elastic deformation also keeps the axial first positioning surface 7 and the axial second positioning surface 8 under a certain pressure. Theoretically, this pressure can also keep the axial first positioning surface 7 and the axial second positioning surface 8 in a locked state. However, in this example, locking pin 12 is engaged in locking slot 17 for better locking effect.

[0098] Example 2: A manually locking insulin injection needle

[0099] like Figure 15-30 As shown, it consists of a needle hub 1, a needle body 4, a front sleeve 2, and a spring 3 (see...). Figure 15 and Figure 16 This embodiment differs from Embodiment 1 in the following ways:

[0100] First, the needle holder 1 is provided with a first stepped surface 18 (see... Figure 19 The first step surface 18 includes a front and a side surface, wherein the axial first positioning surface 7 is the front surface of the first step surface 18, and the circumferential first positioning surface 10 is the side surface of the first step surface 18 (see...). Figure 20 The first step 18 corresponds to the locking groove 17 in Embodiment 1.

[0101] Second, the front sleeve 2 is provided with a second stepped surface 19 (see Figure 17 The second step surface 19 includes a front and a side surface. The axial second positioning surface 8 is the front of the second step surface 19, and the circumferential second positioning surface 11 is the side surface of the second step surface 19 (see...). Figure 18 The second step surface 19 corresponds to the locking post 12 in Embodiment 1.

[0102] Third, the transition surface 9 is an arc surface located on the side of the first step surface 18 and the side of the second step surface 19. This arc surface is not clearly shown in the diagram because it is an arc angle and is not labeled. In this embodiment, the arc surface corresponds to the inclined surface (the inclined surface on the locking post 12) in embodiment 1.

[0103] Fourth, the front sleeve 2 is provided with a support piece 20 (see... Figure 17The second step surface 19 is disposed on the support piece 20. The support piece 20 corresponds to the inner ring in Embodiment 1.

[0104] Fifth, the front sleeve 2 is provided with guide ribs 21 (see... Figure 17 The corresponding guide rib 21 has a guide groove 22 and a positioning groove 23 on the extension sleeve 15 of the needle seat 1 (see...). Figure 19 The guide rib 21 and guide groove 22 enable the front sleeve 2 to slide relative to the needle seat 1 in the axial direction. At the front end limiting position, the front sleeve 2 and needle seat 1 rotate circumferentially. When the front sleeve 2 is rotated clockwise or counterclockwise, the guide rib 21 on the front sleeve 2 slides from the guide groove 22 into the positioning groove 23. The positioning groove 23 maintains circumferential positioning. Once the first circumferential positioning surface 10 contacts the second circumferential positioning surface 11, the guide rib 21 also engages with the positioning groove 23. Accordingly, the front sleeve 2 is axially locked relative to the needle seat 1 due to the pressing engagement between the first axial positioning surface 7 and the second axial positioning surface 8. Simultaneously, the guide rib 21 and positioning groove 23 engage to lock the front sleeve 2 circumferentially relative to the needle seat 1.

[0105] The other structures in Example 2 are basically the same as those in Example 1, and will not be described again here.

[0106] The usage process of Embodiment 2 of the present invention is described below with reference to the accompanying drawings:

[0107] 1. Initial State

[0108] Figure 21 This represents the initial state of the main view. Figure 22 for Figure 21 BB sectional view, Figure 25 A 3D diagram representing the initial state. Figure 26 for Figure 25 A magnified view of a portion of the image. From Figure 22 It can be seen from this that, Figure 8 As can be seen, the front sleeve 2 is in the front limiting position, the inner edge retaining ring 16 on the inner edge of the extension sleeve 15 cooperates with the outer edge retaining ring 14 on the front sleeve 2, and the spring 3 presses against the axial direction of the front sleeve 2 and the needle seat 1. From Figure 25 As can be seen, the guide rib 21 is located in the guide groove 22, but not in the positioning groove 23. From Figure 26 It can be seen that the first step surface 18 and the second step surface 19 are not joined. In other words, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same path with the same radius of rotation, but they are not in the same position in the circumferential direction. In the axial direction, the axial first positioning surface 7 and the axial second positioning surface 8 are misaligned, and the axial first positioning surface 7 is located in front of the axial second positioning surface 8.

[0109] 2. Front sleeve retracted state

[0110] Figure 27 This is a 3D view showing the front sleeve 2 in its fully depressed state during use. Figure 28 for Figure 27 A magnified view of a portion of the image. From Figure 27 As can be seen, the front cannula 2 is in a retracted state relative to the needle hub 1, indicating that insulin has been injected into the patient. After the injection is completed, the insulin needle is pulled out, and the front cannula 2 returns to its initial state under the action of the spring 3. The guide rib 21 is located in the guide groove 22, not in the positioning groove 23. From Figure 28 It can be seen that the first step surface 18 and the second step surface 19 are not joined. In other words, the axial first positioning surface 7 and the axial second positioning surface 8 are on the same path with the same radius of rotation, but they are not in the same position in the circumferential direction. In the axial direction, the axial first positioning surface 7 and the axial second positioning surface 8 are misaligned, and the axial first positioning surface 7 is located in front of the axial second positioning surface 8.

[0111] 4. Front sleeve locked state

[0112] Figure 23 A 3D view showing the front sleeve in a locked state. Figure 24 for Figure 23 CC-shaped sectional view; Figure 29 Another perspective view showing the front sleeve in a locked state. Figure 30 for Figure 29 A magnified view of a portion of the image. From Figure 24 As can be seen, the axial first positioning surface 7 and the axial second positioning surface 8, previously misaligned axially, are now, when the front sleeve 2 is rotated, the axial second positioning surface 8 on the front sleeve 2 rises through the transition surface 9 to press against the axial first positioning surface 7 on the needle seat 1. Simultaneously, the circumferential second positioning surface 11 contacts and positions itself against the circumferential first positioning surface 10. This locks the front sleeve 2 onto the needle seat 1, providing safety protection for the needle tip at the front end of the needle body 4. Figure 29 As can be seen, guide rib 21 is located in positioning groove 23, not in guide groove 22. From Figure 30 As can be seen, the first step surface 18 and the second step surface 19 are engaged. In the locked state, the front sleeve 2 is locked axially relative to the needle seat 1 because the axial first positioning surface 7 and the axial second positioning surface 8 press against each other. The front sleeve 2 is locked circumferentially relative to the needle seat 1 because the circumferential first positioning surface 10 is in contact with the circumferential second positioning surface 11 and the guide rib 21 is located in the positioning groove 23.

[0113] Example 3: A manually locking insulin injection needle

[0114] like Figure 31 and Figure 32 As shown, it consists of needle hub 1 and needle body 4 ( Figure 31 It consists of (not shown), front sleeve 2 and spring 3 (see) Figure 31 This embodiment differs from Embodiment 1 in the following ways: A limiting post 25 is provided on the inner edge of the extension sleeve 15, and a limiting groove 24 is provided on the outer edge of the front sleeve 2 corresponding to the limiting post 25. A circumferential first positioning surface 10 is formed by the side of the limiting post 25, and a circumferential second positioning surface 11 is formed by the side of the limiting groove 24. When the front sleeve 2 is in the front limiting position relative to the needle seat 1, manually rotating the front sleeve 2 causes the limiting groove 24 on the front sleeve 2 to engage with the limiting post 25 on the needle seat 1, positioning the front sleeve 2 relative to the needle seat 1 in the circumferential direction. In this state, the axial first positioning surface 7 on the needle seat 1 and the axial second positioning surface 8 on the front sleeve 2 face each other, positioning the front sleeve 2 relative to the needle seat 1 in the axial direction, thereby locking the front sleeve 2 relative to the needle seat 1.

[0115] The other structures in Example 3 are basically the same as those in Example 1, and will not be described again here.

[0116] The possible variations of the present invention in relation to the above embodiments are described below:

[0117] 1. In the above embodiment 1, the manually locked insulin injection needle consists of a needle hub 1, a needle body 4, a front cannula 2, and a spring 3 (see...). Figure 1 and Figure 2 However, the present invention is not limited to this. The insulin injection needle may also include an outer sleeve, which is a sleeve structure that covers the needle hub 1 and the front cannula 2 to protect the entire insulin injection needle. Since the outer sleeve is irrelevant to the innovation, it is omitted in the text description and drawings. In addition, it may include a tail cap to protect the needle body connecting section. Since the tail cap is also irrelevant to the innovation of the present invention, it is omitted in the text description and drawings. This is also the reason for the open-ended statement in the claims. This is something that those skilled in the art can understand and know.

[0118] 2. In the above embodiment 1, a transition surface 9 is provided for the axial second positioning surface 8 (see...). Figure 4 However, the present invention is not limited to this. A transition surface 9 can be provided for the axial first positioning surface 7, or for both the axial first positioning surface 7 and the axial second positioning surface 8. The transition surface 9 serves as a guide surface for the transition of the axial second positioning surface 8 from a misaligned state to a pressing state with the axial first positioning surface 7. Therefore, this guide surface can be provided adjacent to the axial first positioning surface 7 and / or the axial second positioning surface 8. This is something that those skilled in the art can understand and know.

[0119] 3. In the above embodiment 1, the locking groove 17 is provided on the front end face of the positioning post 5 of the needle seat 1, and there are two locking grooves 17 arranged symmetrically in the circumferential direction (see Figure 6However, the present invention is not limited to this. The locking groove 17 does not necessarily have to be located on the positioning post 5; it can be located in other parts of the pin seat 1, as long as the axial first positioning surface 7 and the circumferential first positioning surface 10 meet the requirements defined in this invention. Similarly, the number of locking grooves 17 does not necessarily have to be two; theoretically, at least one is sufficient, but two have symmetry and the effect is better. This is something that those skilled in the art can understand and know.

[0120] 4. In the above embodiment 1, the locking pin 12 is located on the inner ring 13 (see...) Figure 3 Furthermore, the locking post 12 has two components, which are arranged symmetrically in the circumferential direction (see...). Figure 3 However, the present invention is not limited thereto. Similarly to the locking groove 17, the locking pin 12 does not necessarily have to be located in the inner ring 13, and the number of pins does not necessarily have to be two. This is something that those skilled in the art can understand and know.

[0121] 5. In the above embodiment 1, the needle holder 1 is provided with a locking groove 17 (see... Figure 6 The front sleeve 2 is equipped with a locking pin 12 (see...) Figure 3 However, the present invention is not limited to this; the positions of the two can be interchanged, that is, the locking post 12 is provided on the needle seat 1, and the locking groove 17 is provided on the front sleeve 2. Specifically: the needle seat 1 is provided with a locking post 12, which is a protruding structure facing forward; the axial first positioning surface 7 is the top surface of the locking post 12, and the circumferential first positioning surface 10 is the side surface of the locking post 12. The front sleeve 2 is provided with a locking groove 17, which is a groove structure facing rearward; the axial second positioning surface 8 is the bottom surface of the locking groove 17, and the circumferential second positioning surface 11 is the side surface of the locking groove 17. The transition surface 9 is provided on the outer side of the locking groove 17 and / or the side of the locking post 12. The inner wall of the front sleeve 2 is provided with an inner ring 13 protruding towards the center, and the locking groove 17 is provided on the inner ring 13. The locking post 12 is provided on the front end face of the positioning post 5 of the needle seat 1. This is something that those skilled in the art can understand and know.

[0122] 6. In the above embodiment 1, to ensure the axial sliding fit between the front sleeve 2 and the needle seat 1, and the circumferential rotational fit between the front sleeve 2 and the needle seat 1, an extension sleeve 15 is provided around the positioning post 5 of the needle seat 1 (see...). Figure 6 and Figure 8 However, the present invention is not limited to this. That is to say, it is not necessary to set up the extension sleeve 15 in order to meet the movement relationship between the front sleeve 2 and the needle seat 1. It can be achieved by directly fitting the front sleeve 2 with the outer edge of the interface 6, or by directly fitting the front sleeve 2 with the positioning post 5. This is something that those skilled in the art can understand and know.

[0123] 7. In the above embodiment 1, a spring 3 is provided between the front sleeve 2 and the needle seat 1. However, the present invention is not limited to this, and the front sleeve 2 can reciprocate relative to the needle seat 1 in the axial direction without the spring 3. This is something that those skilled in the art can understand and know.

[0124] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A manually locking insulin injection needle, comprising: Needle hub (1), the needle hub (1) has a positioning post (5) at the front and an interface (6) for connecting an insulin pen at the rear. The needle body (4) has an injection section at the front end and a connecting section at the rear end. The needle body (4) is fixed on the positioning post (5). The injection section extends forward from the front end of the positioning post (5), and the connecting section extends from the rear end of the positioning post (5) into the interface (6). The front sleeve (2) is used to protect the injection section of the needle body (4). The main structure of the front sleeve (2) is a tube body. The front sleeve (2) and the needle seat (1) are axially slidingly fitted. The front sleeve (2) has a front end limiting position relative to the needle seat (1) in the sliding direction. At the front end limiting position, the front sleeve (2) and the needle seat (1) are circumferentially rotating. The features are as follows: the needle seat (1) is provided with an axial first positioning surface (7) facing axially forward, and a corresponding axial second positioning surface (8) is provided on the front sleeve (2) facing axially rearward; the center of the axial first positioning surface (7) and the center of the axial second positioning surface (8) are located on the path of the front sleeve (2) with the same rotation radius relative to the needle seat (1); The needle holder (1) is provided with a circumferential first positioning surface (10), which faces the circumferential clockwise rotation direction or the counterclockwise rotation direction. Corresponding to the circumferential first positioning surface (10), the front sleeve (2) is provided with a circumferential second positioning surface (11), which faces the circumferential counterclockwise rotation direction or the clockwise rotation direction. The center of the circumferential first positioning surface (10) and the center of the circumferential second positioning surface (11) are located on the path of the front sleeve (2) with the same rotation radius relative to the needle holder (1). In the circumferential direction under the assembled state, the phase difference between the center of the axial first positioning surface (7) and the center of the axial second positioning surface (8) is equal to the phase difference between the center of the circumferential first positioning surface (10) and the center of the circumferential second positioning surface (11); When the front sleeve (2) is in the front end limit position relative to the needle seat (1), manually rotate the front sleeve (2) so that when the circumferential second positioning surface (11) on the front sleeve (2) contacts and positions the needle seat (1) with the circumferential first positioning surface (10), the axial second positioning surface (8) on the front sleeve (2) and the axial first positioning surface (7) on the needle seat (1) face to face, thereby locking the front sleeve (2) on the needle seat (1) and forming a safety protection for the front end of the needle tip of the needle body (4); A transition surface (9) is provided for the first axial positioning surface (7) and / or the second axial positioning surface (8). The transition surface (9) is an inclined surface or an arc surface. The transition surface (9) is located next to the first axial positioning surface (7) and / or the second axial positioning surface (8) and is connected to the first axial positioning surface (7) and / or the second axial positioning surface (8). The center of the transition surface (9) is on the same path with the center of the first axial positioning surface (7) or the center of the second axial positioning surface (8) at the same radius of rotation. When the first axial positioning surface (7) and the second axial positioning surface (8) are misaligned in the circumferential direction, the center of the first axial positioning surface (7) and the center of the second axial positioning surface (8) are projected in the axial direction and their positions are staggered. Moreover, the staggered length (S1) falls within the range of the projection length (S2) of the transition surface (9) in the axial direction. When the front sleeve (2) is manually rotated in this state, the second axial positioning surface (8) on the front sleeve (2) climbs through the transition surface (9) to a face-to-face pressing state with the first axial positioning surface (7) on the needle seat (1). At the same time, the second circumferential positioning surface (11) contacts and positions the first circumferential positioning surface (10). The circumferential first positioning surface (10) is located next to the axial first positioning surface (7) and at an angle to the axial first positioning surface (7). The center of the circumferential first positioning surface (10) and the center of the axial first positioning surface (7) are on the same path with the same radius of rotation. The projection position of the center of the circumferential first positioning surface (10) in the axial direction is in front of the projection position of the center of the axial first positioning surface (7) in the axial direction. The circumferential second positioning surface (11) is located next to the axial second positioning surface (8) and at an angle to the axial second positioning surface (8). The center of the circumferential second positioning surface (11) and the center of the axial second positioning surface (8) are on the same rotation radius path. The projection position of the center of the circumferential second positioning surface (11) in the axial direction is in front of the projection position of the center of the axial second positioning surface (8) in the axial direction.

2. The insulin injection needle according to claim 1, characterized in that: The needle seat (1) is provided with a locking groove (17), which is a groove structure and faces forward. The axial first positioning surface (7) is the bottom surface of the locking groove (17), and the circumferential first positioning surface (10) is the side surface of the locking groove (17). The front sleeve (2) is provided with a locking post (12), which is a protruding structure and faces backward. The axial second positioning surface (8) is the top surface of the locking post (12), and the circumferential second positioning surface (11) is the side surface of the locking post (12). The transition surface (9) is located on the outside of the locking groove (17) and / or the side of the locking post (12).

3. The insulin injection needle according to claim 2, characterized in that: The locking groove (17) is located on the front end face of the positioning post (5) of the needle seat (1); the inner wall of the front sleeve (2) is provided with an inner ring (13) protruding towards the center, and the locking post (12) is located on the inner ring (13) and faces the rear.

4. The insulin injection needle according to claim 1, characterized in that: The needle seat (1) is provided with a locking post (12), which is a protruding structure and faces forward. The axial first positioning surface (7) is the top surface of the locking post (12), and the circumferential first positioning surface (10) is the side surface of the locking post (12). The front sleeve (2) is provided with a locking groove (17), which is a groove structure and faces backward. The axial second positioning surface (8) is the bottom surface of the locking groove (17), and the circumferential second positioning surface (11) is the side surface of the locking groove (17). The transition surface (9) is located on the outside of the locking groove (17) and / or the side of the locking post (12).

5. The insulin injection needle according to claim 4, characterized in that: The inner wall of the front sleeve (2) is provided with an inner ring (13) protruding towards the center, and the locking groove (17) is provided on the inner ring (13); the locking post (12) is provided on the front end face of the positioning post (5) of the needle seat (1).

6. The insulin injection needle according to claim 1, characterized in that: The positioning post (5) is provided with an extension sleeve (15) on its periphery. The extension sleeve (15) is a sleeve structure. The sleeve is coaxial with the positioning post (5) and is integrally formed with the positioning post (5). The front sleeve (2) and the extension sleeve (15) are axially slidingly fitted and circumferentially rotating fitted.

7. The insulin injection needle according to claim 6, characterized in that: The rear part of the front sleeve (2) is inserted into the extension sleeve (15). The outer edge of the front sleeve (2) is provided with an outer edge retaining ring (14), and the inner edge of the extension sleeve (15) is provided with an inner edge retaining ring (16). When the front sleeve (2) slides forward relative to the extension sleeve (15), the inner edge retaining ring (16) and the outer edge retaining ring (14) cooperate to form the front end limiting position.

8. The insulin injection needle according to claim 1, characterized in that: The needle seat (1) is provided with a first stepped surface (18), which includes a front and a side. The axial first positioning surface (7) is the front of the first stepped surface (18), and the circumferential first positioning surface (10) is the side of the first stepped surface (18). The front sleeve (2) is provided with a second stepped surface (19), which includes a front and a side. The axial second positioning surface (8) is the front of the second stepped surface (19), and the circumferential second positioning surface (11) is the side of the second stepped surface (19). The transition surface (9) is provided on the side of the first stepped surface (18) and / or the side of the second stepped surface (19).

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