Auxiliary device for intradermal injector

Abstract

The invention belongs to the technical field of injection accessories, discloses an auxiliary device for an intradermal injector, and aims to solve the problems that the intradermal injection needs accuracy and comfort, but the depth of an existing device is difficult to control, the existing device is easy to slip and the existing device is complicated to operate, the auxiliary device comprises a main body assembly, a contact cylinder and a detachable lock catch, and the main body assembly is internally provided with a containing cavity and a needle head; an inclined groove, a vertical groove and a contact step are arranged on the outer wall, a protruding block is arranged on the inner wall of a contact cylinder, optimized structures such as a split shell, an arc-shaped clamping groove and anti-skid protruding lines of a holding part are matched, and protection designs such as lock catch limiting and anti-falling steps are adopted, so that the injection depth is accurate and controllable, a needle head is stable, split design is convenient to assemble and disassemble, and an anti-skid and identification system lowers the operation threshold; hidden dangers such as loosening of parts are avoided through multiple protection, and injection safety, accuracy and usability are improved.

Description

Technical Field

[0001] This invention belongs to the field of injection accessory technology, specifically relating to an auxiliary device for an intradermal syringe. Background Technology

[0002] Intradermal injection is a commonly used method of drug administration in clinical treatment, and it is widely used in scenarios such as insulin injection, delivery of biological agents, and vaccination. Its core requirements are the accuracy of drug delivery and the comfort of patient use, which directly affect the treatment effect and patient medication adherence.

[0003] While intradermal injection aids have been applied to some extent in the existing technology, many problems still need to be solved: On the one hand, the accuracy of drug delivery is difficult to guarantee. Traditional auxiliary devices often lack a stable injection depth limiting structure or rely solely on manual control by the user through simple scale markings. This makes the needle insertion depth susceptible to factors such as operating techniques and patient position. This can result in the needle being inserted too deeply, penetrating the intradermal tissue and entering the muscle layer, affecting the drug absorption rate, or too shallowly, remaining only in the epidermal layer, leading to drug exudation and incomplete absorption. This is especially problematic for patients who need to self-administer medication for a long time, such as those with diabetes. The fluctuation in delivery accuracy caused by individual differences in operation seriously affects the stability of the treatment effect. On the other hand, patient comfort is poor. Most of the skin-contacting parts of existing devices are designed with smooth cylindrical surfaces and lack anti-slip structures adapted to finger pressure, making them prone to slipping and shifting during operation, increasing patients' psychological tension. The main components of some devices feel stiff to the touch and lack a dedicated grip structure design, which can easily lead to hand fatigue with prolonged use. At the same time, the needle fixing structure is poorly designed, which may pose a risk of the needle becoming loose or wobbly after assembly, affecting injection stability and potentially causing patients to worry about safety, further reducing user comfort.

[0004] In addition, the locking and unlocking mechanisms of existing auxiliary devices are often complex in design and cumbersome in operation, making it difficult for elderly patients or people with limited hand mobility to quickly complete device preparation and injection operations. Furthermore, the assembly reliability of some device components is insufficient, and problems such as jamming and detachment are prone to occur after long-term use, which further affects the accuracy of drug delivery and the safety of use. Summary of the Invention

[0005] In view of the problems mentioned in the background art above, the object of the present invention is to provide an auxiliary device for an intradermal syringe.

[0006] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows: An auxiliary device for an intradermal syringe includes a main body assembly, a contact cylinder, and a detachable locking buckle; The main body component has an internal cavity that accommodates the syringe needle, and the needle is placed inside the cavity. The outer wall of the main body component is provided with an oblique groove, a vertical groove and a contact step. One end of the oblique groove is integrally connected to the upper end of the vertical groove. The contact cylinder is cylindrical with a protrusion on its inner wall. When the protrusion engages with the inclined groove, the main body assembly and the contact cylinder are relatively fixed. When the protrusion is located in the vertical groove, the main body assembly and the contact cylinder are in an axial sliding fit. The detachable latch is a snap-on structure, which is inserted between the lower end face of the contact step and the upper end face of the contact cylinder when the device is not in use. In the initial unlocked state, the lower end face of the contact cylinder and the tip of the needle are at the same horizontal plane.

[0007] Further defining the main component, it consists of a first split shell and a second split shell. The edge of the first split shell is provided with a fastening block, and the edge of the second split shell is provided with a corresponding fastening groove. The two are detachably fastened by engaging the fastening block and the fastening groove. After fastening, they enclose the cavity. The main component adopts a split fastening design, which is precisely engaged by engaging the fastening block and the fastening groove. This not only facilitates the assembly, replacement and maintenance of the needle, but also ensures the sealing and stability of the structure after fastening, and avoids the shell from loosening during injection, which would affect the operation accuracy.

[0008] Furthermore, the inner wall of the accommodating cavity is provided with an arc-shaped groove, the contour of which is adapted to the outer wall of the needle tip, and the inner wall of the arc-shaped groove is provided with an annular anti-slip protrusion. The arc-shaped groove and the outer wall of the needle tip are precisely adapted to each other. Together with the annular anti-slip protrusion, the needle tip is positioned at multiple points and fixed in place, further preventing radial shaking or axial displacement of the needle tip, ensuring a stable injection path, and improving the accuracy of drug delivery.

[0009] Furthermore, the outer side of the main component is integrally formed with a grip portion, and the outer surface of the grip portion is provided with axially distributed anti-slip textures. The integrally formed grip portion combined with the axial anti-slip textures increases grip friction, prevents hand slippage during operation, optimizes grip feel, reduces hand fatigue from long-term use, and improves patient operating comfort and stability.

[0010] Furthermore, the lower end of the accommodating cavity is provided with a needle limiting ring. The inner diameter of the needle limiting ring is smaller than the outer diameter of the tail of the needle. The needle limiting ring achieves axial limiting of the needle through inner diameter adaptation, preventing the needle from falling out of the accommodating cavity due to excessive force during injection, forming a dual protection of "radial fixation + axial limiting", further improving the safety of use.

[0011] Furthermore, the lower outer wall of the contact cylinder is provided with symmetrically distributed finger pressure grooves, and the inner wall of the finger pressure grooves is rounded. The symmetrically distributed finger pressure grooves fit the finger pressing posture, and the rounded transition design avoids skin discomfort when pressing. At the same time, it increases the contact friction between the finger and the contact cylinder, prevents the device from shifting when pressing, and ensures stable contact between the contact cylinder and the skin during the injection process.

[0012] Furthermore, the inclined groove extends downward along the outer wall of the main component, and an anti-detachment step is provided at the bottom end of the inclined groove; when the protrusion is engaged with the end of the inclined groove, the anti-detachment step abuts and limits the contact with the end face of the protrusion, and the anti-detachment step at the end of the inclined groove abuts and limits the contact with the end face of the protrusion, thereby enhancing the reliability of the locking state and preventing the main component and the contact cylinder from accidentally unlocking in non-operational states, such as during transportation or storage, thus improving the safety and structural stability of the device.

[0013] Furthermore, the vertical groove extends along the axial direction of the main component and connects to the lower end face of the contact step. The vertical groove connecting to the lower end face of the contact step makes the sliding stroke of the main component smoother, avoids jamming during sliding, and ensures that the sliding end point is precisely aligned with the limit of the contact step, further ensuring the consistency of the injection depth.

[0014] Further defined, the detachable latch includes a latch body and an integrally formed operating handle. The inner contour of the latch body is adapted to the outer wall contour of the main component, and the upper end face of the latch body is fitted with the lower end face of the contact step, and the lower end face is fitted with the upper end face of the contact cylinder. The latch body is precisely fitted to the outer wall of the main component. Combined with the integrally formed operating handle, it not only improves the fitting and limiting effect of the latch with the main component and the contact cylinder, but also facilitates the quick insertion and removal of the latch, reducing the usage threshold for elderly patients or those with limited hand mobility.

[0015] Furthermore, the outer wall of the contact cylinder is provided with a triangular warning mark and a lock-shaped locking mark, and the outer wall of the main component is provided with a matching mark. The matching mark corresponds one-to-one with the triangular warning mark and the lock-shaped locking mark. The warning mark, locking mark and matching mark correspond one-to-one, which intuitively indicates the locking / unlocking status of the device, reduces the risk of misoperation, and is especially convenient for patients who are not familiar with the operation process to quickly master the use method, thus improving the ease of use of the device.

[0016] The beneficial effects of using the present invention are as follows: This invention achieves stable and controllable injection depth and dual fixation of the needle by limiting the depth of the contact step and the locking buckle between the protrusion and the groove, combined with the arc-shaped groove and anti-slip protrusion that adapts to the needle tip, thus completely solving the problems of inconsistent injection depth and needle wobbling. The split shell design of this invention facilitates needle loading and unloading, the anti-slip grip and finger pressure groove enhance grip stability, and the marking system intuitively indicates the working status, reducing the operating threshold and hand fatigue for various groups of people; This invention features an anti-detachment step to prevent accidental unlocking, a needle-limiting ring to prevent axial detachment, and a locking buckle that precisely fits the main component. Multiple protections eliminate the risk of parts loosening or needle detachment during use. Attached Figure Description

[0017] The present invention can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of an embodiment of an auxiliary device for an intradermal syringe according to the present invention; Figure 2 This is a schematic diagram of the exploded structure of an embodiment of an auxiliary device for an intradermal syringe according to the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the exploded structure of an embodiment of an auxiliary device for an intradermal syringe according to the present invention. Figure 2 ; Figure 4 This is a schematic diagram illustrating the use of an auxiliary device for an intradermal syringe according to an embodiment of the present invention; Figure 5 for Figure 4 A cross-sectional schematic diagram; The symbols for the main components are explained below: Main component 1; receiving cavity 11; needle 12; oblique groove 13; vertical groove 14; contact step 15; fastener 16; fastener slot 17; arc-shaped slot 18; gripping part 19; First split housing 1a; Second split housing 1b; Needle limiting ring 111; Anti-detachment step 131; Annular anti-slip protrusion 181; Matching mark 192; Contact cylinder 2; protrusion 21; finger pressure groove 22; triangular warning sign 23; lock-shaped locking sign 24; Detachable latch 3; latch body 31; operating handle 32. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figures 1-5 As shown, an auxiliary device for an intradermal syringe according to the present invention includes a main body assembly 1, a contact cylinder 2, and a detachable locking buckle 3. The main body component 1 has a cavity 11 inside that is adapted to accommodate the syringe needle. The needle 12 is adapted to be placed inside the cavity 11. The outer wall of the main body component 1 is provided with an oblique groove 13, a vertical groove 14 and a contact step 15. One end of the oblique groove 13 is integrally connected to the upper end of the vertical groove 14. The contact cylinder 2 is cylindrical, and its inner wall is provided with a protrusion 21. When the protrusion 21 is engaged with the inclined groove 13, the main body assembly 1 and the contact cylinder 2 are relatively fixed. When the protrusion 21 is located in the vertical groove 14, the main body assembly 1 and the contact cylinder 2 form an axial sliding fit. The detachable latch 3 is a snap-on structure, which is inserted between the lower end face of the contact step 15 and the upper end face of the contact cylinder 2 when the device is not in use. In the initial unlocked state, the lower end face of the contact cylinder 2 is at the same horizontal plane as the tip of the needle 12.

[0020] In this embodiment, the main component 1 is a cylindrical shell structure with an axially extending cavity 11 inside. The inner diameter of the cavity 11 precisely matches the outer diameter of the needle 12. After the needle 12 is inserted into the cavity 11, it is interference-fitted by the elastic deformation of the inner wall to ensure no radial wobble. The outer wall of the main component 1 is symmetrically machined with two sets of oblique grooves 13 and vertical grooves 14. Each set of grooves is independently formed and interconnected at the top. The width of the grooves is clearance-fitted with the thickness of the protrusions 21 on the inner wall of the contact cylinder 2 to ensure smooth sliding. The lower middle part of the main component 1 extends outward to form an annular contact step 15. The radial width of the step is slightly larger than the wall thickness of the contact cylinder 2. The end face is finely polished to ensure no gap when it is in contact with the upper end face of the contact cylinder 2. The contact cylinder 2 is open at both ends. The cylindrical structure has an inner wall that slides into the outer wall of the main component 1. The inner wall has two protrusions 21 integrally formed at the positions of the two sets of grooves. The ends of the protrusions 21 are rounded to facilitate sliding within the grooves. The detachable latch 3 is a U-shaped latch structure. The inner arc of the latch body 31 is completely fitted with the outer wall of the main component 1. The operating handle 32 is integrally formed with the latch body 31 and extends outward. When the device is idle, the latch body 31 is precisely fitted between the lower end face of the contact step 15 and the upper end face of the contact cylinder 2, forming a rigid limit. In the initial unlocking state, by strictly controlling the depth of the accommodating cavity 11 and the installation position of the needle 12, the lower end face of the contact cylinder 2 and the needle tip of the needle 12 are at the same level, completely avoiding the risk of accidental puncture during idle or preparation stages. Before use, hold the syringe and needle to draw the medicine into the medicine bottle. The amount drawn can be obtained by following the scale on the syringe. Then remove the needle and insert the syringe containing the medicine into the needle 12 that is limited by the accommodating cavity 11 in the main body component 1 to achieve docking. Then press the syringe plunger lightly, observe the condition of the needle tip, and perform the most basic air purging operation. When in use, pinch the operating handle 32 of the detachable lock 3 with your fingers and pull it outward in the horizontal direction to release the limiting constraint between the contact step 15 and the contact cylinder 2. Then, grasp the grip part 19 on the outside of the main body component 1 and rotate the main body component 1 clockwise. The protrusion 21 on the inner wall of the contact cylinder 2 slides along the inclined groove 13 to the position that communicates with the vertical groove 14. At this time, the circumferential fixed relationship between the main body component 1 and the contact cylinder 2 is released, and it enters the sliding state. The lower end face of the contact cylinder 2 is tightly attached to the injection site. The finger presses the finger pressure groove 22 on the outer wall of the contact cylinder 2 to keep the device stable. At the same time, the main body component 1 is pushed downward at a uniform speed. The main body component 1 slides smoothly along the axial direction of the vertical groove 14. The needle 12 moves down synchronously with the main body component 1 and accurately pierces the intradermal tissue. When the lower end face of the contact step 15 is fully in contact with the upper end face of the contact cylinder 2, the main body component 1 stops sliding. At this time, the insertion depth of the needle 12 is the preset precise depth to avoid being too deep or too shallow. After the injection is completed, pull the main body component 1 upward to the initial position and rotate the main body component 1 counterclockwise so that the protrusion 21 slides back into the end of the inclined groove 13 until it abuts and locks against the anti-detachment step 131. Finally, insert the detachable lock 3 back into its original position to complete the entire operation process. Alternatively, the entire auxiliary device can be discarded directly, i.e., the auxiliary device is a disposable item to ensure health.

[0021] Furthermore, the needles are designed with different lengths to accommodate different medications. According to international standards, they are generally available in three sizes: 27G, 30G, and 32G in diameter. After the medication is injected, the clips retract into the auxiliary device body to prevent the needles from protruding, which is beneficial for waste disposal.

[0022] This device achieves a breakthrough in the safety and accuracy of intradermal injection through its innovative "initial flush positioning + double locking + precise sliding" structural design. The design, where the needle tip is flush with the lower end of the contact cylinder 2 in the initial state, solves the industry pain points of traditional auxiliary devices being prone to accidental punctures when idle and lacking safety during the preparation stage, representing a creative improvement distinct from existing technologies. The symmetrical layout of the oblique groove 13 and vertical groove 14, combined with the bidirectional positioning of the protrusion 21, makes the locking and sliding switching of the main component 1 more stable, avoiding displacement caused by unilateral force. Combined with the secondary positioning of the detachable latch 3, it forms a dual protection of "mechanical locking + physical limiting". This completely eliminates accidental unlocking when not in operation; the gap between the main component 1 and the contact cylinder 2 is precisely controlled within 0.05mm, ensuring smooth and stable sliding without any jamming or shaking. Combined with the rigid fit and limiting of the contact step 15, the injection depth error is controlled within ±0.08mm, which is far superior to the accuracy level of existing devices; the overall structure adopts a modular design, with fewer parts and convenient assembly, allowing operation without professional training. It is suitable for professional medical scenarios such as hospitals and clinics, as well as meeting the self-injection needs of diabetic patients, elderly patients, and other family members. While ensuring treatment effectiveness, it significantly improves the safety and comfort of use.

[0023] The preferred main body component 1 is composed of a first split shell 1a and a second split shell 1b. The edge of the first split shell 1a is provided with a fastening block 16, and the edge of the second split shell 1b is provided with a corresponding fastening groove 17. The two are detachably fastened by the fastening block 16 and the fastening groove 17, and after being fastened, they enclose and form an accommodating cavity 11.

[0024] In this embodiment, the first split shell 1a and the second split shell 1b are symmetrically designed. The corresponding positions on the edges of the two are injection molded to form a fastener 16 and a fastener slot 17, respectively. The end of the fastener 16 is rounded to facilitate insertion, and the inner wall of the fastener slot 17 is provided with a shallow groove to form an engagement with the fastener 16. During assembly, the needle 12 is placed in the half-groove of the receiving cavity of one of the split shells, and then the other split shell is aligned and fastened. After the fastener 16 is fully inserted into the fastener slot 17, the mating surfaces of the two shells are tightly fitted and together form a complete receiving cavity 11. Food-grade sealant can be applied to the mating surface to further improve the sealing performance. To accommodate different specifications of main components 1, the height of the fastener 16 can be designed as an adjustable structure. By setting an elastic pad at the bottom of the fastener 16, minor size compensation can be achieved. At the same time, a guide slope is set at the entrance of the fastener slot 17, so that even if there is a slight misalignment between the two separate shells, they can be fastened smoothly. For mass production needs, the fastener 16 and the fastener slot 17 can be processed using standardized molds to ensure that shells from different batches can be interchanged and matched at will. The split design completely solves the problem of difficult needle installation and removal in integrated main components. Medical staff or patients can quickly replace and clean the needle. The snap-fit ​​structure of the buckle 16 and buckle slot 17 is more convenient than screw fixing, and the rigidity of the snap-fit ​​structure is sufficient to resist the axial force during injection, avoiding the separation of the shell and the resulting needle displacement. This not only improves the efficiency of operation, but also ensures the structural stability of the injection process.

[0025] The inner wall of the preferred accommodating cavity 11 is provided with an arc-shaped groove 18, the contour of which is adapted to the outer wall of the nipple of the needle 12, and the inner wall of the arc-shaped groove 18 is provided with an annular anti-slip protrusion 181.

[0026] In this embodiment, the inner wall of the receiving cavity 11 is integrally formed with an arc-shaped groove 18 that perfectly matches the curvature of the outer wall of the nipple at the position corresponding to the nipple of the needle 12. The depth of the groove is 1 / 3 of the diameter of the nipple, ensuring the contact area while avoiding excessive wrapping that affects loading and unloading. The inner wall of the arc-shaped groove 18 has 3-4 rings of annular anti-slip protrusions 181 evenly distributed along the circumference. These protrusions are made of soft plastic material, which has both a certain elasticity and provides sufficient friction. To address the subtle size differences in the needle tips of different brands of syringes, multiple sets of arc-shaped slots 18 can be designed. Adaptation can be achieved by replacing the removable bushing on the inner wall of the receiving cavity 11. The bushing and the receiving cavity 11 are fixed with an interference fit. The annular anti-slip protrusion 181 can be designed as a spiral to further enhance the biting force with the outer wall of the tip and prevent the needle 12 from rotating when subjected to axial force. The precise fit between the arc-shaped groove 18 and the needle tip forms a radial positioning point. Combined with the friction limit of the annular anti-slip protrusion 181, the needle 12 achieves dual fixation of "surface contact + point friction" within the accommodating cavity 11, completely eliminating radial shaking and axial movement of the needle during injection. This ensures that the needle always penetrates along the preset path, effectively improving the accuracy of drug delivery, and is especially suitable for drugs such as insulin that have extremely high requirements for injection location.

[0027] The outer side of the preferred main component 1 is integrally formed with a grip portion 19, and the outer surface of the grip portion 19 is provided with axially distributed anti-slip textures.

[0028] In this embodiment, the outer side of the main component 1, away from the contact step 15, is integrally injection molded with the shell to form a grip 19. The length of the grip 19 is 1 / 2 of the height of the main component 1, and the width is slightly larger than the width of a finger. Its outer surface is processed with uniformly distributed anti-slip ridges along the axial direction. The cross-section of the ridges is semi-circular, which will not cause discomfort due to excessive density, and can effectively increase the friction between the fingers and the grip. The anti-slip texture can be designed with a gradient spacing, with the spacing being denser near the ends to fit the concentrated area of ​​force when the finger presses. The one-piece molded grip 19 is more stable than a separately assembled handle structure, eliminating the risk of loosening. The axially distributed anti-slip texture effectively disperses the pressure on the fingers, maintaining a stable grip even when the hands are sweaty, preventing the device from slipping during operation. The ergonomic size design makes the grip more comfortable, and the hand fatigue of patients who self-inject for a long time is significantly reduced, indirectly improving medication adherence.

[0029] Preferably, the lower end of the accommodating cavity 11 is provided with a needle limiting ring 111, and the inner diameter of the needle limiting ring 111 is smaller than the outer diameter of the tail of the needle 12.

[0030] In this embodiment, the lower end of the accommodating cavity 11, near the outlet, has an integrally formed annular needle limiting ring 111. The inner diameter of the limiting ring is smaller than the outer diameter of the tail of the needle 12, forming an axial block. The end face of the limiting ring is completely fitted with the stepped surface of the tail of the needle, ensuring that the needle 12 cannot be dislodged from the lower end of the accommodating cavity 11. The material of the limiting ring is the same as that of the main component 1, ensuring sufficient structural strength to resist the axial force during injection. For needles 12 with different tail sizes, the needle limiting ring 111 can be designed as a replaceable annular gasket. The gasket is fixed to the inner wall of the receiving cavity 11 by a snap-fit ​​structure. The inner diameter of the gasket is classified according to the commonly used needle models. When replacing, the old gasket can be removed and the new size can be installed. At the same time, the inner side of the gasket can be provided with elastic protrusions to further enhance the fit with the tail of the needle. The needle limiting ring 111 and the arc-shaped groove 18 form a dual protection system of "axial limiting + radial fixing". The arc-shaped groove 18 restricts the radial movement of the needle, while the limiting ring prevents the needle from axially dislodging. Even if the axial force is too large due to operational errors during injection, the needle 12 can be stably placed in the receiving cavity 11, avoiding safety hazards such as needle dislodgement and leakage, and providing dual safety protection for the injection process.

[0031] Preferably, the lower outer wall of the contact cylinder 2 is provided with symmetrically distributed finger pressure grooves 22, and the inner wall of the finger pressure grooves 22 has a rounded transition.

[0032] In this embodiment, the lower outer wall of the contact cylinder 2 is machined with inwardly recessed finger pressure grooves 22 at two symmetrical positions. The shape of the grooves conforms to the curvature of the fingertips of an adult's index finger and thumb. The inner wall of the grooves is rounded to avoid indentations or discomfort when the fingers press. The position of the grooves is symmetrical with the axis of the contact cylinder 2 to ensure uniform force when pressing. To improve compatibility, the surface of the silicone pad can be processed with fine anti-slip textures to further increase the friction between the fingers and the contact cylinder 2. At the same time, the elasticity of the silicone material can buffer the impact force when pressing. The symmetrically distributed acupressure grooves 22 provide a clear point of force for the fingers, preventing the fingers from slipping and shifting when pressing. The rounded inner wall design improves the comfort of long-term pressing, especially suitable for scenarios that require slow injection. When pressing, the contact area between the finger and the contact cylinder 2 is increased, making the contact cylinder 2 fit more tightly with the skin, reducing the shaking of the device during injection, and ensuring the accuracy of the needle insertion position.

[0033] Preferably, the inclined groove 13 extends downward along the outer wall of the main component 1, and the bottom end of the inclined groove 13 is provided with an anti-detachment step 131; when the protrusion 21 is inserted into the end of the inclined groove 13, the anti-detachment step 131 abuts and limits the end face of the protrusion 21.

[0034] In this embodiment, the inclined groove 13 extends obliquely from the top to the bottom along the outer wall of the main component 1. The width of the groove is matched with the width of the protrusion 21. The bottom end of the groove protrudes inward to form an anti-detachment step 131. The height of the step is 1 / 2 of the depth of the groove. When the protrusion 21 slides along the inclined groove 13 to the end, the end face of the anti-detachment step 131 completely abuts against the end face of the protrusion 21, forming a rigid limit and preventing the protrusion 21 from continuing to slide. To improve the operating feel, the end face of the anti-slip step 131 can be provided with a small elastic protrusion, and the corresponding position of the protrusion 21 is provided with a shallow groove. When the two come into contact, the elastic protrusion is inserted into the shallow groove, producing a clear "click" sound to indicate that the locking is in place. At the same time, the groove wall of the inclined groove 13 can be machined with guide ribs to ensure that the protrusion 21 slides smoothly along the groove and avoids jamming. The anti-detachment step 131 makes the locking state between the main component 1 and the contact cylinder 2 more reliable. Even if the device is subjected to vibration or collision during transportation or storage, the protrusion 21 will not accidentally come out of the inclined groove 13, effectively preventing the risk of accidental puncture by the needle 12 when idle. The clear locking position also allows users to clearly judge whether the device is in a safe state, improving the safety and trust in the use process.

[0035] Preferably, the vertical groove 14 extends along the axial direction of the main body component 1 and connects to the lower end face of the contact step 15.

[0036] In this embodiment, the vertical groove 14 extends downward from the top along the axial direction of the main component 1. The length of the groove matches the height of the contact step 15, and the lower end is directly connected to the lower end face of the contact step 15 to form a complete sliding channel. The groove wall of the vertical groove 14 is fitted with the side wall of the protrusion 21 to ensure that there is no obvious shaking when the main component 1 slides. The entrance of the groove is rounded to facilitate the smooth rotation of the protrusion 21 from the inclined groove 13. To further improve sliding stability, the groove wall of the vertical groove 14 can be machined with an axial guide groove, and the side wall of the protrusion 21 is provided with a guide strip. The cooperation between the guide groove and the guide strip achieves precise positioning. At the same time, a small amount of medical-grade lubricating oil can be applied to the groove to reduce sliding friction. The lubricating oil also has dustproof properties to prevent wear of the groove due to long-term use. The design of the vertical groove 14 connecting to the lower end face of the contact step 15 ensures that the sliding stroke end point of the main component 1 is completely synchronized with the limit of the contact step 15. When the main component 1 slides to the contact step 15 and fits against the contact cylinder 2, the protrusion 21 slides exactly to the bottom of the vertical groove 14, avoiding sliding jamming or stroke deviation, ensuring that the injection depth is completely consistent each time, and greatly improving the accuracy of the injection dose.

[0037] The preferred detachable latch 3 includes a latch body 31 and an integrally formed operating handle 32. The inner contour of the latch body 31 is adapted to the outer contour of the main body component 1, and the upper end face of the latch body 31 is in contact with the lower end face of the contact step 15, and the lower end face is in contact with the upper end face of the contact cylinder 2.

[0038] In this embodiment, the buckle body 31 of the detachable buckle 3 has an arc-shaped sheet structure. The curvature of the inner side is completely consistent with the curvature of the outer wall of the main component 1. There is no obvious gap after fitting. The upper and lower end faces of the buckle body 31 are both processed by a surface grinder to ensure flatness. The contact area with the contact step 15 and the contact cylinder 2 is more than 90%. The operating handle 32 is perpendicular to the outer side of the buckle body 31. The length is 1.5 times the width of the buckle body 31. The end is provided with a round grip for easy gripping. To accommodate different sizes of main components 1, the buckle body 31 can be designed as a telescopic structure, with width adjustment achieved through internal elastic plates. The surface of the operating handle 32 can be machined with anti-slip textures or wrapped with soft materials to improve grip comfort. At the same time, positioning protrusions can be set on the inner side of the buckle body 31 to cooperate with the positioning holes on the outer wall of the main component 1 to prevent the buckle from accidentally falling off. The precise fit between the buckle body 31 and the main component 1 ensures the reliability of the limit. The one-piece molded operating handle 32 makes the buckle insertion and removal operation easier, and even elderly patients with weak hand strength can easily complete the operation. Compared with the traditional pin-type buckle, this structure has a higher fit and can effectively prevent the slight shaking of the main component 1 when idle, which not only improves the convenience of operation, but also enhances the overall stability of the device.

[0039] The outer wall of the preferred contact cylinder 2 is provided with a triangular warning mark 23 and a lock-shaped locking mark 24, and the outer wall of the main component 1 is provided with a matching mark 192. The matching mark 192 corresponds one-to-one with the triangular warning mark 23 and the lock-shaped locking mark 24.

[0040] In this embodiment, the outer wall of the contact cylinder 2 is printed with a triangular warning mark 23 and a lock-shaped locking mark 24 at the corresponding protrusion 21. The warning mark 23 is printed with red ink and the locking mark 24 is printed with green ink. The two marks are distributed around the circumference of the contact cylinder 2, and the spacing is consistent with the spacing of the oblique groove 13 and the vertical groove 14. The outer wall of the main component 1 is engraved with a matching mark 192 at the corresponding position. The mark is engraved with a recessed process to ensure that it is not easy to wear and is flush with the height of the mark on the contact cylinder 2. To improve the recognizability of the markings, fluorescent ink can be used to print the markings on the contact cylinder 2, which can be clearly seen even in low light conditions. At the same time, the matching marking 192 can be designed as a color-changing structure. When the main component 1 and the contact cylinder 2 are in the locked state, the matching marking 192 is aligned with the green locking marking 24 and the same color. When it is in the unlocked state, it is aligned with the red warning marking 23. The color change intuitively indicates the status. The clear labeling system allows users to quickly determine the device status without professional training. The red warning label 23 reminds users of the operational risks after unlocking, while the green locking label 24 confirms the safe status. The one-to-one correspondence of the matching label 192 avoids misoperation caused by rotation angle deviation. This visual design greatly reduces the barrier to entry, especially suitable for patients who are not familiar with the operation process, and effectively improves the ease of use and safety of the device.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. An auxiliary device for an intradermal syringe, characterized in that: Includes main body component (1), contact cylinder (2) and detachable latch (3); The main body component (1) has a cavity (11) for fitting the syringe needle inside, and a needle (12) is fitted inside the cavity (11). The outer wall of the main body component (1) is provided with an oblique groove (13), a vertical groove (14) and a contact step (15). One end of the oblique groove (13) is integrally connected to the upper end of the vertical groove (14). The contact cylinder (2) is cylindrical, and its inner wall is provided with a protrusion (21). When the protrusion (21) is engaged with the inclined groove (13), the main body assembly (1) and the contact cylinder (2) are relatively fixed. When the protrusion (21) is located in the vertical groove (14), the main body assembly (1) and the contact cylinder (2) form an axial sliding fit. The detachable latch (3) is a snap-on structure, which is inserted between the lower end face of the contact step (15) and the upper end face of the contact cylinder (2) when the device is not in use. In the initial unlocked state, the lower end face of the contact cylinder (2) and the tip of the needle (12) are at the same horizontal plane.

2. The auxiliary device for an intradermal syringe according to claim 1, characterized in that: The main body component (1) is composed of a first split shell (1a) and a second split shell (1b). The edge of the first split shell (1a) is provided with a fastening block (16), and the edge of the second split shell (1b) is provided with a corresponding fastening slot (17). The two are detachably fastened by the fastening block (16) and the fastening slot (17), and after being fastened, they surround and form the accommodating cavity (11).

3. The auxiliary device for an intradermal syringe according to claim 1, characterized in that: The inner wall of the accommodating cavity (11) is provided with an arc-shaped groove (18), the outline of which is adapted to the outer wall of the nipple of the needle (12), and the inner wall of the arc-shaped groove (18) is provided with an annular anti-slip protrusion (181).

4. The auxiliary device for an intradermal syringe according to claim 1, characterized in that: The outer side of the main component (1) is integrally formed with a grip (19), and the outer surface of the grip (19) is provided with axially distributed anti-slip textures.

5. An auxiliary device for an intradermal syringe according to claim 1, characterized in that: The lower end of the accommodating cavity (11) is provided with a needle limiting ring (111), the inner diameter of which is smaller than the outer diameter of the tail of the needle (12).

6. An auxiliary device for an intradermal syringe according to claim 1, characterized in that: The lower outer wall of the contact cylinder (2) is provided with symmetrically distributed finger pressure grooves (22), and the inner wall of the finger pressure grooves (22) is rounded.

7. An auxiliary device for an intradermal syringe according to claim 1, characterized in that: The inclined groove (13) extends downward along the outer wall of the main component (1), and the bottom end of the inclined groove (13) is provided with an anti-detachment step (131); when the protrusion (21) is inserted into the end of the inclined groove (13), the anti-detachment step (131) and the end face of the protrusion (21) are abutted and limited.

8. An auxiliary device for an intradermal syringe according to claim 1, characterized in that: The vertical groove (14) extends along the axial direction of the main body component (1) and connects to the lower end face of the contact step (15).

9. An auxiliary device for an intradermal syringe according to claim 1, characterized in that: The detachable latch (3) includes a latch body (31) and an integrally formed operating handle (32). The inner contour of the latch body (31) is adapted to the outer contour of the main component (1), and the upper end face of the latch body (31) is in contact with the lower end face of the contact step (15), and the lower end face is in contact with the upper end face of the contact cylinder (2).

10. An auxiliary device for an intradermal syringe according to claim 1, characterized in that: The outer wall of the contact cylinder (2) is provided with a triangular warning mark (23) and a lock-shaped locking mark (24), and the outer wall of the main component (1) is provided with a matching mark (192). The matching mark (192) corresponds one-to-one with the triangular warning mark (23) and the lock-shaped locking mark (24).

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