A patch type infusion device

Abstract

The utility model discloses an embodiment discloses a kind of plaster type infusion device for liquid medicine, including main body shell, main body shell includes body part and the extension from the side of body part, the adjacent position of extension is equipped with installation space;It also includes dosing device, dosing device includes storage shell, connecting pipe and connecting needle, the both ends of connecting pipe are respectively connected with storage shell, connecting needle, and storage shell is detachably arranged in installation space.The body part of the scheme is integrally formed with extension, and it is substantially square structure after assembling storage shell, significantly shorten Y-axis direction length, reduce activity limited.Extension and storage shell use multiple groups of guiding type snap structure, linear positioning is accurate when assembling, and it can be fixed and has in-place feedback when advancing, and it takes into account stability and disassembly convenience.When assembling, stress is dispersed by long side multiple contact points, and the force area is large, the connection is more stable, and no threaded adapter is needed, effectively reduce the thickness in Z-axis direction, and the performance of plaster type infusion device for liquid medicine is optimized.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a patch-type drug infusion device. Background Technology

[0002] Patch-type drug infusion devices are commonly used to treat diseases such as diabetes. They store drugs such as insulin inside and can be applied and fixed to the skin of a person or other organism. The drug can be injected into the body of a person or other organism anytime and anywhere as needed to achieve the therapeutic function.

[0003] A typical patch-type drug infusion device includes an injection device, a drug delivery device, a base plate, a main body shell, and a control device. For example, Chinese utility model patents CN217219375U and CN114392049B provide an integrated balanced patch-type drug infusion system, which has advantages such as being compact and portable, and able to adhere to the skin and move with the body. However, after long-term market application, the applicant has discovered the following defects and shortcomings in the above solution: 1) After assembly, the drug delivery device protrudes from one side of the main body shell, resulting in the patch-type drug infusion device being too long in the Y-axis direction. After being pasted on the human skin, it becomes inconvenient to use and carry (such as being easily rubbed by clothing, restricting movement, etc.). 2) The drug delivery device and the main body shell can be connected by snap-fit ​​or threaded connection. If threaded connection is used, the connection part must be designed in a circular shape, which will unnecessarily increase the thickness of the device and occupy a large height in the Z-axis direction (when in fact a large installation space is not required in the Z-axis direction). 3) If a snap-fit ​​connection is used, since the drug delivery device itself has a certain length, it is fixed only by the snap-fit ​​connection at its end after installation. The stress point is single, the connection strength is low and unstable, and it is easy to shake or loosen during use, which affects the accuracy of drug infusion.

[0004] Therefore, it is necessary to design a more rationally designed patch-type drug infusion device. Utility Model Content

[0005] In order to overcome the technical problems of insufficient space optimization and insufficient connection reliability of the existing patch-type drug infusion device, the present invention provides a patch-type drug infusion device, which has the characteristics of being more portable and having better connection reliability.

[0006] The technical solution adopted by this utility model to solve its problem is: A patch-type drug infusion device, comprising: The main body housing includes a main body portion and an extension portion protruding from one side of the main body portion, and an installation space is provided at an adjacent position of the extension portion; A drug delivery device includes a drug storage shell, a connecting tube, and a connecting needle. The two ends of the connecting tube are respectively connected to the drug storage shell and the connecting needle. The drug storage shell is detachably disposed in the installation space. The extension portion has a first slot, a second slot, and a third slot on the side facing the medicine storage shell. The first slot has a first opening, the second slot has a second opening, and the third slot has a third opening. The medicine storage shell has a first locking strip, a second locking strip, and an elastic buckle on the side facing the extension portion. The first locking strip, the second locking strip, the first slot, and the second slot all extend along the protruding direction of the extension portion. During assembly, the first locking strip is inserted into the first slot through the first opening, and the second locking strip is inserted into the second slot through the second opening, until the elastic buckle is engaged into the third slot through the third opening, so as to engage the medicine storage shell with the extension.

[0007] In the above technical solution, the L-shaped main shell design, with the main body and extension integrally formed, achieves layered utilization of internal space, significantly shortens the Y-axis length, improves wearing concealment and comfort, and reduces movement restrictions. The extension and the drug storage shell adopt a multi-set guide-type interlocking structure, ensuring precise linear positioning during assembly. It can be fixed simply by pushing it in, with feedback upon reaching the target position, greatly shortening operation time and balancing stability with ease of disassembly. The drug storage shell disperses stress through multiple contact points along its long side, resulting in a large stress-bearing area, more stable connection, and no need for threaded adapters. This effectively reduces the thickness in the Z-axis direction, comprehensively optimizing the performance of the patch-type drug infusion device.

[0008] As a preferred embodiment, the first card strip includes a first body portion and a first engaging portion, and the second card strip includes a second body portion and a second engaging portion. The first body portion and the first engaging portion, as well as the second body portion and the second engaging portion, respectively form an L-shaped structure. After assembly, the first engaging portion is located in the first card slot, and the second engaging portion is located in the second card slot.

[0009] In the above technical solution, the first and second body parts serve as the structural base, providing rigid support and a stable carrier for stress transmission. During assembly, the two engaging parts are precisely guided to insert into the corresponding slots along a preset path, reducing misalignment. The engaging parts protrude from the Z-axis direction of the body parts and tightly engage with the slots. When under force, the body parts disperse stress along the Y-axis, and the engaging parts transmit force through surface contact, avoiding stress concentration and significantly improving pull-out resistance, thus balancing connection stability and structural compactness.

[0010] As a preferred embodiment, the first slot and the second slot are arranged opposite to each other in the thickness direction of the patch-type drug infusion device, and the first engaging portion and the second engaging portion are arranged opposite to each other in the thickness direction of the patch-type drug infusion device.

[0011] In the above technical solution, the two slots are arranged opposite each other along the Z-axis, and together with the two locking parts arranged opposite to each other, they form an "upper and lower clamping" structure. When subjected to external force in the Z-axis direction, the upper and lower locking parts and the slots generate opposite forces, which counteract the movement in the thickness direction, avoid the force imbalance and loosening of the unilateral arrangement design, and improve stability.

[0012] As a preferred embodiment, both the first and second card slots are trapezoidal slot structures with the width of the slot gradually decreasing from the outside to the inside. The first and second card strips are respectively matched with the shapes of the first and second card slots, and the ends of the first and second card strips are respectively provided with a first guide portion and a second guide portion. The end of the elastic buckle is provided with a guide surface.

[0013] In the above technical solution, the wedge-shaped locking effect generated by the trapezoidal groove design creates lateral compressive force through the width difference between the inner and outer sides, enhancing the anti-loosening performance, resisting vibration and tension, and providing greater fatigue resistance than rectangular grooves, ensuring a long-term stable connection between the drug storage shell and the extension. Two guide sections guide the smooth insertion of the locking strip, and the guide surface reduces the resistance of the elastic buckle, minimizing jamming and wear, shortening assembly time, and reducing operational difficulty.

[0014] As a preferred embodiment, a first clearance space is provided in the adjacent area of ​​the first slot along the protruding direction of the extension, and the first clearance space is used to set the third slot.

[0015] In the above technical solution, the first clearance space provides an independent area for the third slot, allowing it to be arranged in an orderly manner with the first slot, avoiding structural interference and improving space utilization. Simultaneously, this space ensures that the insertion of the locking strip and the engagement of the elastic buckle do not interfere with each other, ensuring smooth assembly steps, preventing incomplete engagement or component wear, and enhancing the overall structural compactness and assembly reliability.

[0016] As a preferred embodiment, the first clip is recessed inward to form an avoidance groove, and a second avoidance space is formed between the avoidance groove and the elastic buckle. The second avoidance space is used to provide deformation space for the elastic buckle.

[0017] In the above technical solution, the second clearance space provides an independent deformation zone for the buckle. When the elastic buckle is assembled or disassembled, it can deform freely towards the clearance groove to avoid being blocked by the first locking strip, ensuring smooth deformation and reset, solving the problem of jamming or breakage caused by traditional interference, without increasing the size of the device, and taking into account both structural compactness and buckle function reliability.

[0018] As a preferred embodiment, the outer periphery of the third slot is provided with a recessed groove, and the elastic buckle protrudes from the recessed groove to form a third clearance space between the elastic buckle and the recessed groove; the medicine storage shell is also provided with a side protrusion structure, and the extension is recessed inward to form a fourth clearance space, and the fourth clearance space and the side protrusion structure are arranged adjacent to each other.

[0019] In the above technical solution, the recessed groove is a downward-recessed structure that provides a third clearance space for the elastic buckle. This allows the user to easily insert their finger to move the elastic buckle and disassemble it, avoiding the difficulty of disassembly or damage to the buckle caused by a narrow operating space, thus reducing the difficulty of operation. The fourth clearance space is an operating gap provided by the convex side structure, which allows the user to pull the convex side structure to smoothly remove the medicine storage shell, improving disassembly efficiency.

[0020] As a preferred embodiment, the main body protrudes outward from the side facing the drug storage shell to form a connecting portion, the connecting portion is inserted into the drug storage shell, and a waterproof silicone ring is provided between the drug storage shell and the connecting portion.

[0021] In the above technical solution, the connecting part is inserted into the drug storage shell to form a fitted structure, restricting relative displacement. Combined with the slot and strip, it forms a double fixation, enhancing connection stability. The waterproof silicone ring is compressed to fill the gaps, blocking liquid penetration and preventing drug contamination or damage to electronic components. This solves the problem of insufficient sealing in traditional snap-fit ​​devices without increasing the device thickness.

[0022] As a preferred embodiment, the patch-type drug infusion device further includes a base plate, the side of which is provided with several fixing buckles, and the main body shell is provided with several fixing slots. The fixing buckles and the fixing slots engage to detachably mount the main body shell onto the base plate.

[0023] In the above technical solution, the base plate serves as an adhesive carrier, attaching to the skin via an adhesive layer or a fixation device to prevent displacement and ensure needle stability. Its snap-fit ​​connection to the main body allows for detachment, facilitating the replacement of internal components or a faulty base plate, thus overcoming the drawbacks of traditional integrated designs. The snap-fit ​​prevents movement, reduces skin friction, and balances wearing stability with cost-effectiveness.

[0024] As a preferred embodiment, the patch-type drug infusion device further includes an injection device, which includes a needle hub and an indwelling needle mounted on the needle hub. The main body shell has a through first clearance hole, and a mounting buckle is provided in the first clearance hole. The bottom plate has a through second clearance hole, which is arranged opposite to the first clearance hole. The connecting needle extends into the first clearance hole and engages with the mounting buckle. The needle hub is inserted into the second clearance hole and connected to the connecting needle.

[0025] In the above technical solution, the first and second clearance holes form a through channel, precisely guiding the connecting needle to align with the axis of the injection device, avoiding assembly misalignment and ensuring smooth drug infusion. The flexible sealing element (such as a rubber component) of the needle hub is easily pierced by the connecting needle to achieve a sealed connection. The mounting buckle secures the connecting needle to prevent shaking, and the needle hub is inserted into the second clearance hole to restrain axial displacement. This dual positioning enhances connection stability, preventing needle detachment or seal failure, and ensuring safety. The modular design simplifies assembly, requires no tools, improves efficiency, and does not increase thickness, maintaining a slim and comfortable wearing experience.

[0026] In summary, the patch-type drug infusion device provided by this utility model has at least the following technical advantages compared with the prior art: 1) This solution utilizes an L-shaped main shell design, integrating the main body and extension into a single unit. This allows core components such as the control device and power module to be systematically integrated within the L-shaped cavity, achieving layered utilization of internal space and avoiding volume redundancy caused by component stacking. The adjacent installation space of the extension provides a fitting structure for the drug storage shell. After assembly, the device has a roughly square structure, significantly shortening its Y-axis length compared to the single-sided protruding layout of existing drug delivery devices. This compact design significantly reduces the abruptness when the device is in contact with the skin, minimizing friction with clothing during daily activities. It is particularly suitable for scenarios involving exercise and bending, solving the problem of limited mobility caused by excessive length in existing devices, while also improving concealment and comfort during carrying.

[0027] 2) The extension and the drug storage housing adopt a multi-set guide-type locking structure. The first and second locking slots form parallel guide tracks along the protruding direction of the extension, precisely engaging with the corresponding first and second locking strips. During assembly, linear positioning can be achieved through these tracks with minimal deviation. A clear "click" sound is produced when the elastic buckle engages with the third locking slot, ensuring proper assembly. Compared to traditional threaded connections that require multiple rotations, this solution only requires pushing the drug storage housing a short distance along the Y-axis to complete the fixing, significantly reducing assembly time and simplifying operation. Furthermore, the disassembly force of the locking structure can be set to an appropriate level, ensuring stability during use while facilitating manual replacement of the drug storage housing, achieving a dual optimization of connection reliability and ease of use.

[0028] 3) The drug storage shell is connected to the main shell via a snap-fit ​​connection along its long side. Multiple contact points distribute stress, and the contact length constitutes a significant portion of the total length of the storage shell. Compared to the single-point force-bearing mode of existing end-snap connections, the force-bearing area is significantly increased, improving connection stability and reliability, preventing loosening or shaking, and effectively ensuring the accuracy of drug infusion. Furthermore, this solution eliminates the need for a circular connection portion to accommodate threads, allowing the thickness of the main shell to be controlled within a relatively thin range based on actual needs, resulting in a significantly lower Z-axis height compared to traditional threaded connection designs. Attached Figure Description

[0029] Figure 1 This is a first structural schematic diagram of the patch-type drug infusion device of this utility model; Figure 2 This is a first structural schematic diagram of the main shell of this utility model; Figure 3 This is a schematic diagram of the second structure of the main body shell of this utility model; Figure 4 This is a schematic diagram of the second structure of the main body shell of this utility model; Figure 5 for Figure 4 The diagram shows a partially enlarged view of section H. Figure 6 This is a first structural schematic diagram of the drug delivery device of this utility model; Figure 7 This is a schematic diagram of the second structure of the drug delivery device of this utility model; Figure 8 This is a partial cross-sectional view of the extension of this utility model when it is assembled with the drug storage shell; Figure 9 This is a schematic diagram of the base plate and injection device of this utility model; Figure 10 This is a schematic diagram of the second structure of the patch-type drug infusion device of this utility model; The meanings of the reference numerals in the attached figures are as follows: 1. Main body shell; 11. Connecting part; 111. Waterproof silicone ring; 12. First clearance hole; 121. Mounting buckle; 2. Extension part; 21. First slot; 211. First clearance space; 22. Second slot; 23. Third slot; 24. Settling groove; 25. Fourth clearance space; 3. Drug delivery device; 4. Drug storage shell; 41. First locking strip; 411. First body part; 412. First engaging part; 413. First guide part; 414. Clearance groove; 42. Second locking strip; 421. Second body part; 422. Second engaging part; 423. Second guide part; 43. Elastic buckle; 431. Guide surface; 44. Side protrusion structure; 5. Connecting tube; 6. Connecting needle; 7. Injection device; 71. Indwelling needle; 8. Base plate; 81. Fixing buckle; 82. Second clearance hole; 9. Body part. Detailed Implementation

[0030] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0031] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0033] See Figure 1 As shown, the protruding direction of the extension 2 is the Y-axis direction, which is also the long side direction of the patch-type drug infusion device and the drug storage shell 4; the thickness direction or height direction of the patch-type drug infusion device is the Z-axis direction; and the direction perpendicular to the Y-axis and Z-axis is the X-axis direction, which is also the short side direction of the patch-type drug infusion device and the drug storage shell 4.

[0034] See Figure 2 and Figure 3As shown, in the technical solution of this utility model, the patch-type drug infusion device includes a main shell 1, which includes a body portion 9 and an extension portion 2 protruding from one side of the body portion 9. An installation space is provided adjacent to the extension portion 2. The body portion 9 serves as the core load-bearing structure of the device, integrating key components such as the control device and power supply, forming a functional hub. The extension portion 2 protrudes from one side of the body portion 9, and the two are integrally formed, combining to form an L-shaped layout. The installation space formed by the adjacent area of ​​the extension portion 2 provides a matching accommodating area for the drug delivery device 3, allowing the components to cooperate orderly in a compact layout, reducing the overall space occupied, and making the assembled patch-type drug infusion device generally square in structure, resulting in a compact design.

[0035] Compared to the single-sided protruding layout of the drug delivery device 3 in the prior art, the length of the patch-type drug infusion device in this solution is significantly shortened in the Y-axis direction. This compact design significantly reduces the abruptness when the skin is in contact with the skin and reduces the probability of friction with clothing in daily activities. It is especially suitable for sports, bending over and other action scenarios, solving the problem of limited activity caused by the excessive length of the existing technology device, while improving the concealment and comfort when carrying it.

[0036] See Figure 1 , Figure 6 and Figure 7 As shown, the patch-type drug infusion device also includes a drug delivery device 3. The drug delivery device 3 includes a drug storage shell 4, a connecting tube 5, and a connecting needle 6. Both ends of the connecting tube 5 are connected to the drug storage shell 4 and the connecting needle 6, respectively. The drug storage shell 4 is detachably installed in the installation space. The drug storage shell 4 serves as a drug storage carrier and is detachably installed in the installation space, allowing for easy removal of the drug storage shell 4 when medication needs to be changed, thus balancing convenient drug storage and replacement. The two ends of the connecting tube 5 are connected to the drug storage shell 4 and the connecting needle 6, forming a closed drug delivery pathway. The drug in the drug storage shell 4 can be precisely infused into the body along the connecting tube 5 and through the connecting needle 6, achieving effective delivery of the therapeutic drug.

[0037] See Figures 3-5 and Figure 8 As shown, the extension 2 has a first slot 21, a second slot 22, and a third slot 23 on the side facing the medicine storage housing 4. The first slot 21 has a first opening, the second slot 22 has a second opening, and the third slot 23 has a third opening. See also Figures 6-8 As shown, the medicine storage shell 4 is provided with a first locking strip 41, a second locking strip 42, and an elastic buckle 43 on the side facing the extension 2. The first locking groove 21 and the second locking groove 22 both extend in the protruding direction of the extension 2, and the first locking strip 41 and the second locking strip 42 both extend in the protruding direction of the extension 2.

[0038] Specifically, the first slot 21 and the second slot 22 extend along the protruding direction of the extension 2. Their first and second openings provide insertion entrances for the first and second locking strips 41 and 42, respectively. After the first and second locking strips 41 and 42 are inserted, the sidewalls of the first and second slots 21 and 22 restrict their lateral movement, forming a directional guide path to prevent deviation. When pushed to the preset position, the elastic buckle 43 is compressed and then engages with the third slot 23 through the third opening, locking tightly against the inner wall of the third slot 23, thus achieving a stable connection between the medicine storage shell 4 and the extension 2.

[0039] During assembly, the first locking strip 41 is inserted into the first locking groove 21 along the first opening, and the second locking strip 42 is inserted into the second locking groove 22 along the second opening. Utilizing the extension characteristics of the first locking groove 21 and the second locking groove 22 along the protruding direction of the extension 2, the medicine storage housing 4 is guided to advance along a preset straight trajectory. As it advances, the elastic buckle 43 on the medicine storage housing 4 remains under compression and gradually approaches the third opening. Upon reaching the third opening, the elastic buckle 43 resets and engages with the inner wall of the third locking groove 23, achieving a mechanical lock between the medicine storage housing 4 and the extension 2, thus completing the detachable fixing.

[0040] Based on the above structural design, this solution ensures that the medicine storage shell 4 is accurately pushed along a fixed path by the double slot guide. The engagement of the elastic buckle 43 with the third slot 23, combined with the auxiliary support of the double slot, makes the force on the connection part 11 between the extension part 2 and the medicine storage shell 4 evenly distributed, which greatly enhances the overall connection stability and effectively avoids the deviation of medicine infusion caused by shaking during use.

[0041] Compared to threaded connections, this solution eliminates the need for a circular connection structure, maintaining a flat overall design and significantly reducing the height along the Z-axis, thus improving skin comfort. Furthermore, the snap-fit ​​connection eliminates the need for thread tightening; simply pushing the medication reservoir 4 a short distance along the Y-axis completes the fixation, greatly reducing assembly time and simplifying the user's process for replacing the reservoir 4. This balances structural compactness with ease of operation. Additionally, the disassembly force of the snap-fit ​​structure can be set to an appropriate level, ensuring stability during use while facilitating manual replacement of the reservoir 4, achieving a dual optimization of connection reliability and ease of use.

[0042] Compared to the traditional end-clamp connection design that relies on a single contact point for force, this solution forms multi-point support along the extension direction through the cooperation of the first clip 41 and the first slot 21, and the second clip 42 and the second slot 22. This significantly increases the contact area between the drug storage shell 4 and the extension 2, making the force more uniform and significantly improving the stability and reliability of the connection between the two. It effectively avoids drug infusion deviation caused by loosening or shaking during use.

[0043] See Figure 2 and Figure 3 As shown, in a preferred embodiment, the main body 9 protrudes outward from the side facing the medicine storage shell 4 to form a connecting part 11, the connecting part 11 is inserted into the medicine storage shell 4, and a waterproof silicone ring 111 is provided between the medicine storage shell 4 and the connecting part 11.

[0044] Specifically, the connecting part 11, which protrudes from the main body 9 into the drug storage shell 4, is inserted into the drug storage shell 4 to form a fitted structure. This physical contact restricts the relative displacement between the drug storage shell 4 and the main body shell 1, enhancing overall connection stability. The waterproof silicone ring 111 between the connecting part 11 and the drug storage shell 4, when compressed, fills the gap between them, blocking liquid penetration and achieving a sealed protection. Compared to structures without positioning, the insertion design of the connecting part 11 further constrains the shaking of the drug storage shell 4, forming a double fixation with the slot and strip structure, improving connection reliability. The waterproof silicone ring 111 effectively prevents sweat, water stains, etc., from intruding into the device, avoiding drug contamination or damage to electronic components. This solves the problem of insufficient sealing in traditional snap-fit ​​connections, while maintaining a balance between protective performance and space compactness without increasing the device thickness.

[0045] More specifically, the connecting part 11 is also provided with a push rod mechanism that can reciprocate linearly along the protruding direction of the extension part 2. When the push rod mechanism is pushed forward, it can be inserted into the medicine storage shell 4 and directly squeeze the medicine liquid in the medicine storage shell 4 through mechanical thrust, so that the medicine liquid is output in an orderly manner through the connecting tube 5 and the connecting needle 6, achieving a precise infusion effect; when the push rod mechanism is retracted, it is disengaged from the medicine storage shell 4, leaving space for medicine replacement.

[0046] The direction of movement of the push rod mechanism is consistent with the protruding direction of the extension 2 and matches the assembly path of the drug storage shell 4, ensuring stable and uniform pushing force and reducing drug residue. Compared with independently driven infusion structures, this design is integrated into the connecting part 11, without occupying additional space, maintaining the compactness of the device, while the mechanical pushing method improves the accuracy and controllability of the infusion dose.

[0047] Example 1 In a preferred embodiment of this utility model, a design scheme is provided for how to assemble and connect the extension 2 and the medicine storage shell 4 using multiple sets of guide-type engagement structures.

[0048] See Figures 3-5 as well as Figure 8As shown, in this embodiment, the first locking strip 41 includes a first body portion 9411 and a first engaging portion 412, and the second locking strip 42 includes a second body portion 9421 and a second engaging portion 422. The first body portion 9411, the first engaging portion 412, the second body portion 9421, and the second engaging portion 422 respectively form an L-shaped structure. After assembly, the first engaging portion 412 is located in the first slot 21, and the second engaging portion 422 is located in the second slot 22. The first body portion 9411 and the second body portion 9421 serve as structural bases, extending along the Y-axis to form rigid supports, providing a stable carrier for stress transmission. During assembly, they provide precise guidance for the drug storage shell 4, ensuring that the engaging portion smoothly inserts into the slot along a preset path, reducing the probability of assembly misalignment and improving installation efficiency. The first engaging portion 412 and the second engaging portion 422 protrude from the first body portion 9411 and the second body portion 9421 along the Z-axis, respectively, to perform the engaging connection function. After being embedded in the first slot 21 and the second slot 22, they form a tight engagement with the slot walls. With their combined action, when the medicine storage shell 4 is subjected to external force, the body portion 9 disperses and transmits the stress along the Y-axis, while the engaging portions transmit the force to the two slots through surface contact, preventing stress concentration at the ends. This significantly improves the pull-out resistance compared to traditional connection methods, ensuring connection stability without increasing the thickness of the device, thus balancing structural compactness and connection reliability.

[0049] In the above scheme, although the main body 9 and the engaging part of the first locking strip 41 and the second locking strip 42 both extend along the Y-axis direction (the protruding direction of the extension 2), their engaging parts protrude from the Z-axis direction (above or below) of the main body 9, forming a close contact with the inner wall of the first locking groove 21 and the second locking groove 22 in the Z-axis direction. Compared with the single-line contact of the traditional straight-bar locking strip which only extends along the Y-axis, the above structural design increases the contact area in the Z-axis direction, forming a "three-dimensional constraint". This can simultaneously restrict the loosening of the drug storage shell 4 in the Y-axis direction (the assembly direction of the drug storage shell 4) and the movement in the Z-axis direction (the thickness direction of the device), avoiding vertical offset and significantly improving connection stability.

[0050] Furthermore, the protruding engaging portion along the Z-axis forms an interlocking structure perpendicular to the direction of force with the slot. When the drug storage shell 4 is pulled by an external force, the force is first transmitted to the two main body parts 9, and then the main body parts 9 transmit the tension to the integrally formed engaging portion. At this time, the engaging portion, because it is embedded in the slot, will be subject to the opposite constraint forces of the two slots. Since the engaging portion protrudes from the Z-axis direction (above or below) of the main body part 9 and is embedded in the two slots, the contact area between the engaging portion and the slot will form a force fulcrum. Because the two locking strips have a certain length along the Y-axis, the stress at this fulcrum can be transmitted and diffused along the Y-axis direction. As a result, the stress per unit area is significantly reduced, which can reduce the risk of deformation and breakage of the first locking strip 41 and the second locking strip 42 due to excessive local stress, while enhancing the overall tensile strength of the drug storage shell 4 and further ensuring the stability of the connection.

[0051] More specifically, the above design utilizes the engaging part protruding along the Z-axis of the main body 9 to achieve structural reinforcement. The protruding engaging part does not exceed the original Z-axis space range of the device, so there is no need for additional thickening devices. This avoids the redundancy of Z-axis dimensions caused by threaded connections and solves the problem of insufficient Z-axis constraint of ordinary snap-fit ​​devices. At the same time, the main body 9 extending in the Y-axis direction can still ensure assembly guidance accuracy and reduce the probability of misalignment. It achieves a balance between connection strength and assembly convenience in a compact space.

[0052] See Figure 8 As shown, in a preferred embodiment, the first slot 21 and the second slot 22 are arranged opposite to each other in the thickness direction (i.e., the Z-axis direction) of the patch-type drug infusion device, and the first engaging part 412 and the second engaging part 422 are arranged opposite to each other in the thickness direction (i.e., the Z-axis direction) of the patch-type drug infusion device.

[0053] Specifically, the first slot 21 and the second slot 22 are arranged opposite each other in the Z-axis direction, and together with the first engaging part 412 and the second engaging part 422 distributed in opposite directions, they form a "top-bottom clamping" constraint structure design. When the medicine storage shell 4 is subjected to an external force in the Z-axis direction (such as pressing, collision, etc.), the upper and lower engaging parts form opposite forces with the inner walls of the corresponding slots, which can effectively counteract the movement in the thickness direction. Compared with the design of slots arranged on one side, it can effectively avoid tilting or loosening caused by force imbalance, and significantly improve the connection stability in the Z-axis direction. Furthermore, the above layout design allows the medicine storage shell 4 to maintain movement in the Y-axis direction during the assembly process, and the upper and lower engaging parts are synchronously inserted into the corresponding slots, avoiding assembly skew caused by unilateral guide deviation, reducing the wear risk of the slots and engaging parts, and improving assembly accuracy and efficiency.

[0054] Furthermore, the first slot 21 and the second slot 22 are staggered in the X-axis direction, meaning there is a distance difference between them in the X-axis direction, forming an asymmetrical distribution design. Compared to a symmetrical layout, this creates a "distributed stress fulcrum" in the X-axis direction. When the drug storage shell 4 is subjected to a lateral (horizontal) external force, the contact points between the two engaging parts and their corresponding slots are further apart, which can disperse stress through the force couple effect, avoiding stress concentration in a single area, significantly improving resistance to lateral deformation, and reducing damage to the slots or engaging parts caused by excessive local stress. In addition, the asymmetrical horizontal distance difference can form an "anti-misassembly structure": if assembled in reverse, the engaging parts cannot be smoothly inserted because the horizontal positions of the engaging parts and the opposite slots do not match, thus avoiding loose connections or abnormal drug delivery caused by the drug storage shell 4 being installed backwards, further ensuring reliability.

[0055] In a preferred embodiment, both the first slot 21 and the second slot 22 are trapezoidal slot structures with a width that gradually decreases from the outside to the inside. That is, the width of the slot gradually decreases from its first opening and second opening towards the inside. The first locking strip 41 and the second locking strip 42 are respectively matched with the shapes of the first slot 21 and the second slot 22. Specifically, the width of the first slot 21 and the second slot 22 gradually decreases from the outside to the inside, forming a gradual fitting structure with the shape-matching first locking strip 41 and second locking strip 42. During assembly, the two locking strips are easily introduced from the wider slot opening (i.e., the first opening and the second opening), and gradually fit tightly against the inner wall of the slot as they are pushed in, reducing assembly resistance and avoiding the shaking caused by gaps in traditional straight slots.

[0056] Furthermore, the difference in width between the inner and outer sides of the above design can form a "wedge locking" effect. After the two locking strips are inserted, they form a lateral squeezing force with the corresponding slot, which enhances the anti-loosening performance of the connection. Even if subjected to vibration or pulling, the relative displacement can be suppressed by the continuous contact friction force. It is more fatigue-resistant than the rigid locking of the rectangular slot, effectively ensuring the long-term stability of the connection between the drug storage shell 4 and the extension 2, and providing reliable structural support for drug infusion.

[0057] And see also Figure 6 and Figure 7 As shown, the ends of the first locking strip 41 and the second locking strip 42 are respectively provided with a first guide portion 413 and a second guide portion 423, and the end of the elastic buckle 43 is provided with a guide surface 431. The first guide portion 413 and the second guide portion 423 are used to guide the first locking strip 41 and the second locking strip 42 to smoothly insert along the openings of the first locking groove 21 and the second locking groove 22, reducing jamming caused by alignment deviations. The guide surface 431 of the elastic buckle 43 is used to reduce resistance when engaging the third locking groove 23, making the "click" feedback clearer. Compared to a structure without guides, the above structural design can shorten assembly time, avoid wear on the edges of the first locking strip 41, the second locking strip 42, the elastic buckle 43, or the first locking groove 21, the second locking groove 22, and the third locking groove 23 due to hard impacts, reduce user operation difficulty, and improve assembly success rate and structural durability.

[0058] Example 2 In another preferred embodiment of this utility model, a design scheme is provided for how to complete the assembly by using multiple clearance spaces to achieve multiple sets of guide-type interlocking structures.

[0059] See Figures 3-5 As shown, in the technical solution of this embodiment, a first clearance space 211 is provided in the adjacent area of ​​the first slot 21 along the protruding direction of the extension 2, and the first clearance space 211 is used to set the third slot 23.

[0060] In the above technical solution, the first clearance space 211 formed by the adjacent areas of the first slot 21 is used to provide an independent setting area for the third slot 23, so that the first slot 21 and the third slot 23 are arranged in an orderly manner in the protruding direction of the extension 2, avoiding structural interference caused by the concentrated setting of multiple slots, realizing functional zoning within a limited space, and improving space utilization. At the same time, the first clearance space 211 ensures that the path of the first clip 41 into the first slot 21 and the action of the elastic buckle 43 into the third slot 23 do not interfere with each other, ensuring that the clip guidance and buckle locking are completed smoothly in steps during assembly, avoiding incomplete engagement or component wear caused by structural crowding, and enhancing the compactness of the overall structure and assembly reliability.

[0061] See Figure 6 and Figure 7 As shown, in a preferred embodiment, the first clip 41 is recessed inward to form an avoidance groove 414, and a second avoidance space is formed between the avoidance groove 414 and the elastic buckle 43. The second avoidance space is used to provide deformation space for the elastic buckle 43.

[0062] In the above technical solution, the second clearance space formed between the clearance groove 414 of the first locking strip 41 and the elastic buckle 43 provides an independent deformation area for the elastic buckle 43. When the elastic buckle 43 is assembled into or disassembled from the third locking groove 23, it can deform freely in the direction of the clearance groove 414, avoiding being blocked by the first locking strip 41, ensuring that the buckle can smoothly complete the "compression and contraction-spring-opening and reset" action, solving the problem of jamming or breakage caused by interference between the buckle and adjacent components in the traditional structure. In addition, the above design achieves functional partitioning within the limited surface space of the medicine storage shell 4, without the need to increase the thickness in the Z-axis direction or the width in the X-axis direction, thus balancing structural compactness and functional reliability of the elastic buckle 43.

[0063] See Figure 4 and Figure 5 As shown, in a preferred embodiment, the outer periphery of the third slot 23 is provided with a recessed groove 24, and the elastic buckle 43 protrudes from the recessed groove 24 so that a third clearance space is formed between the elastic buckle 43 and the recessed groove 24.

[0064] In the above technical solution, the recessed groove 24 is a groove structure formed by the downward indentation of the extension 2, which provides sufficient third clearance space for the elastic buckle 43. When disassembling, the user can easily insert their finger into the recessed groove 24 and move the elastic buckle 43 to disengage it from the third groove 23, thus completing the disassembly operation. This avoids the difficulty of disassembly or accidental damage to the buckle due to narrow operating space, significantly reducing the difficulty of disassembly. Furthermore, the clearance function of the recessed groove 24 prevents interference between the finger and the surface of the extension 2 during operation, protecting the structural integrity of the elastic buckle 43 and the extension 2, extending the life of the components, and improving disassembly efficiency. Especially in scenarios where the medicine storage shell 4 needs to be frequently replaced, this design significantly optimizes the user's operating experience, and the simple structure requires no additional components, balancing practicality and economy.

[0065] See Figure 3 and Figure 5 As shown, the medicine storage housing 4 also has a side protrusion structure 44, and the extension 2 is recessed inward to form a fourth clearance space 25. The fourth clearance space 25 and the side protrusion structure 44 are arranged adjacent to each other. Specifically, the fourth clearance space 25 formed by the extension 2 is used to reserve a hand operation gap for the side protrusion structure 44. When the user disassembles, they can easily insert their fingers into the fourth clearance space 25 and pull the side protrusion structure 44 outward. With the force fulcrum of the side protrusion structure 44, the medicine storage housing 4 can be smoothly disassembled along the first slot 21 and the second slot 22, reducing disassembly resistance. The above design not only avoids wear of the locking structure caused by inconvenient force application, but also improves disassembly efficiency, especially in scenarios where the medicine storage housing 4 is frequently replaced, significantly optimizing the operating experience.

[0066] Example 3 In another preferred embodiment of this utility model, a further structural design scheme for a patch-type drug infusion device is provided.

[0067] See Figure 1 , Figure 9 and Figure 10 As shown, in the technical solution of this embodiment, the patch-type drug infusion device also includes a base plate 8. The side of the base plate 8 is provided with a plurality of fixing buckles 81, and the main body shell 1 is provided with a plurality of fixing slots. The fixing buckles 81 and the fixing slots are engaged to detachably install the main body shell 1 onto the base plate 8.

[0068] Specifically, the base plate 8 serves as the adhesive carrier for the patch-type drug infusion device, and can fix the device to the skin through its bottom adhesive layer or other adhesive structures (such as patches). On the one hand, the base plate 8 firmly adheres to the skin, preventing the device from shifting during daily activities and ensuring the stability of the infusion needle position; on the other hand, the snap-fit ​​connection between the base plate 8 and the main body shell 1 allows for detachable assembly and disassembly without tools, facilitating the replacement of internal components or the individual replacement of the base plate 8 if the adhesive layer fails, solving the problem of needing to replace the entire device when the adhesive layer fails in traditional integrated designs. At the same time, the tight engagement of the fixing buckle 81 and the fixing slot ensures no relative movement between the main body shell 1 and the base plate 8, reducing friction and irritation to the skin, and balancing wearing stability and cost-effectiveness.

[0069] See Figures 1-3 , Figure 9 and Figure 10 As shown, in a preferred embodiment, the patch-type drug infusion device further includes an injection device 7. The injection device 7 includes a needle hub and an indwelling needle 71 installed on the needle hub. The main body shell 1 is provided with a through first clearance hole 12. A mounting buckle 121 is provided in the first clearance hole 12. The bottom plate 8 is provided with a through second clearance hole 82. The second clearance hole 82 and the first clearance hole 12 are arranged opposite to each other. The connecting needle 6 extends into the first clearance hole 12 and is engaged with the mounting buckle 121. The needle hub is inserted into the second clearance hole 82 and connected to the connecting needle 6.

[0070] In the above scheme, the first clearance hole 12 and the second clearance hole 82 are arranged opposite to each other to form a complete and continuous Z-axis channel, which precisely guides the alignment of the axes of the connecting needle 6 and the injection device 7, avoiding misalignment caused by misalignment during assembly, ensuring a smooth infusion path of the drug from the connecting needle 6 to the injection device 7, reducing drug residue or infusion resistance, and reducing skin discomfort caused by positional displacement after puncture of the indwelling needle 71. The needle hub includes a flexible seal to allow the output end of the drug delivery device 3 (i.e., the connecting needle 6) to pierce the flexible seal for drug infusion, thus connecting the drug delivery device 3 and the injection device 7. The flexible seal can be a rubber component, and the indwelling needle 71 can be a vertical indwelling needle 71.

[0071] Furthermore, the mounting clip 121 within the first clearance hole 12 engages with the connecting needle 6, fixing its radial position and preventing it from wobbling. The insertion of the needle seat into the second clearance hole 82 further constrains axial displacement. This dual-positioning structure significantly enhances the connection stability between the injection device 7 and the main housing 1 and base plate 8, preventing needle detachment or seal failure due to pulling during daily activities and ensuring infusion safety. Moreover, the modular hole and clip design simplifies the assembly process, allowing for tool-free docking of the connecting needle 6 and needle seat, improving assembly and disassembly efficiency. The two clearance hole structures do not occupy additional thickness space in the device, and combined with the skin-fitting characteristics of the base plate 8, maintain a slim and lightweight wearing experience.

[0072] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A patch-type drug infusion device, characterized in that, include: The main body housing includes a main body portion and an extension portion protruding from one side of the main body portion, and an installation space is provided at an adjacent position of the extension portion; A drug delivery device includes a drug storage shell, a connecting tube, and a connecting needle. The two ends of the connecting tube are respectively connected to the drug storage shell and the connecting needle. The drug storage shell is detachably disposed in the installation space. The extension portion has a first slot, a second slot, and a third slot on the side facing the medicine storage shell. The first slot has a first opening, the second slot has a second opening, and the third slot has a third opening. The medicine storage shell has a first locking strip, a second locking strip, and an elastic buckle on the side facing the extension portion. The first locking strip, the second locking strip, the first slot, and the second slot all extend along the protruding direction of the extension portion. During assembly, the first locking strip is inserted into the first slot through the first opening, and the second locking strip is inserted into the second slot through the second opening, until the elastic buckle is engaged into the third slot through the third opening, so as to engage the medicine storage shell with the extension.

2. The patch-type infusion device according to claim 1, wherein The first card strip includes a first body portion and a first engaging portion, and the second card strip includes a second body portion and a second engaging portion. The first body portion and the first engaging portion, and the second body portion and the second engaging portion respectively form an L-shaped structure. After assembly, the first engaging portion is located in the first card slot, and the second engaging portion is located in the second card slot.

3. The patch-type infusion device according to claim 2, wherein The first slot and the second slot are arranged opposite to each other in the thickness direction of the patch-type drug infusion device, and the first engaging part and the second engaging part are arranged opposite to each other in the thickness direction of the patch-type drug infusion device.

4. The patch-type infusion device according to claim 1, wherein Both the first and second slots are trapezoidal slot structures with the width of the slot gradually decreasing from the outside to the inside. The first and second strips are respectively matched with the shapes of the first and second slots, and the ends of the first and second strips are respectively provided with a first guide portion and a second guide portion. The end of the elastic buckle is provided with a guide surface.

5. The patch-type infusion device according to claim 1, wherein Along the protruding direction of the extension, a first clearance space is provided in the adjacent area of ​​the first slot, and the first clearance space is used to set the third slot.

6. The patch-type infusion device according to claim 5, wherein The first clip is recessed inward to form an avoidance groove, and a second avoidance space is formed between the avoidance groove and the elastic buckle. The second avoidance space is used to provide deformation space for the elastic buckle.

7. The patch-type infusion device according to claim 6, wherein The outer periphery of the third slot is provided with a recessed groove, and the elastic buckle protrudes from the recessed groove to form a third clearance space between the elastic buckle and the recessed groove; the medicine storage shell is also provided with a side protrusion structure, and the extension is recessed inward to form a fourth clearance space, and the fourth clearance space and the side protrusion structure are arranged adjacent to each other.

8. The patch-type infusion device according to claim 1, wherein The main body protrudes outward from the side facing the drug storage shell to form a connecting part, the connecting part is inserted into the drug storage shell, and a waterproof silicone ring is provided between the drug storage shell and the connecting part.

9. The patch-type infusion device according to any one of claims 1 to 8, wherein The patch-type drug infusion device also includes a base plate, the side of which is provided with several fixing buckles, and the main body shell is provided with several fixing slots. The fixing buckles and the fixing slots are engaged to detachably install the main body shell onto the base plate.

10. The patch-type infusion device according to claim 9, wherein The patch-type drug infusion device also includes an injection device, which includes a needle hub and an indwelling needle installed on the needle hub. The main body shell has a through first clearance hole, and a mounting buckle is provided in the first clearance hole. The bottom plate has a through second clearance hole, which is arranged opposite to the first clearance hole. The connecting needle extends into the first clearance hole and engages with the mounting buckle. The needle hub is inserted into the second clearance hole and connected to the connecting needle.

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