A wearable drug delivery device

Abstract

The application provides a wearable drug delivery device, belonging to the technical field of medical instruments. The wearable drug delivery device comprises a shell assembly, a drug container support, a needle insertion-removal mechanism, a drug liquid delivery assembly, a needle support and a needle assembly; the drug container support is provided with an elastic buckling mechanism, which is limited in a first buckling position through a liftable structure during preloading, and is pressed to a second buckling position by breaking the liftable structure during use; the needle support is provided with an air inlet in a main needle channel and a liquid inlet in a channel; the outlet of the peristaltic pump is connected to the needle assembly through a silica gel hose, for extracting and delivering the drug liquid from the drug container to the main needle. Through the preloaded drug container direct integration, intelligent trigger mechanism and multi-sensor closed-loop monitoring system, the problems of drug secondary transfer pollution, structural complexity and drug liquid residue are solved. The pre-filled drug liquid container is directly loaded into the device, eliminating the drug liquid transfer step and eliminating the pollution risk.

Description

Technical Field

[0001] This application relates to the field of medical devices, and more specifically, to a wearable drug delivery device. Background Technology

[0002] Currently, the demand for convenient drug delivery among patients with chronic diseases (such as rheumatoid arthritis and psoriasis) is surging. Patients using patch injectors see 6-8 fewer visits per year, reducing healthcare costs. Unlike insulin patches, non-insulin patch injectors are upgrading from "disposable devices" to "reusable + intelligent monitoring." Taking BD's Libertas patch injector as an example, it is a pre-filled, ready-to-use drug delivery system with a fully mechanized design. Users simply "tear, stick, and press" to complete the operation, requiring no additional filling or assembly. It is available in 2-5 ml and 5-10 ml configurations to meet different treatment needs, providing stable output thrust to ensure uniform subcutaneous delivery of high-viscosity biologics. The drug extraction device disclosed in patent number US11701464B2(LTS) uses a dedicated drug chamber design, which requires transferring the drug from the drug container in the device to the dedicated drug chamber of the device, and pushing the drug liquid is achieved by driving the piston with a screw. The existing technical solutions described above have the following drawbacks: The drug solution needs to be transferred to a dedicated drug tank, which requires sterilization and sealing, increasing the risk of drug contamination. The device contains multiple complex components, such as fluid pathways, reservoir needles, main needles, and electromechanical pump assemblies; this complexity may increase manufacturing and maintenance costs, potentially compromising the device's reliability. Summary of the Invention

[0003] To address the above shortcomings, this application provides a wearable drug delivery device aimed at improving the risk of drug contamination and the reliability of the device.

[0004] This application provides a wearable drug delivery device, including a shell assembly, a drug container support, a needle insertion-retraction mechanism, a drug delivery assembly, a needle support, a needle assembly, an adhesive assembly, and a rotating lower cover structure. The outer shell assembly includes an upper cover and a lower cover, the upper cover and the lower cover being fitted together; the upper cover is provided with a positioning groove, and a label is affixed to the positioning groove; the drug container support is provided with an elastic fastening mechanism, which is used to limit the drug container support to the first fastening position by a flip-up structure during pre-assembly, and to pull off the flip-up structure to press the drug container support to the second fastening position during use. The needle assembly has a dual-channel structure, with channel one connected to the main needle and channel two connected to the liquid inlet; the needle insertion-retraction mechanism includes a rack, a gear, and a reduction motor. The rack is fixed to the main needle, the gear is coaxially fixed to the drive shaft of the reduction motor, and the rack meshes with the gear. The rack extends / retracts by the forward and reverse rotation of the gear, thereby achieving the automatic needle insertion and withdrawal function. The drug delivery assembly includes a pre-filled drug container, a peristaltic pump, and connecting tubing; the outlet of the peristaltic pump is connected to the needle assembly via a silicone tubing; it is used to draw the drug from the drug container and deliver it to the main needle, which then delivers the drug into the patient's body. The needle holder is equipped with a needle, which is a double-hole needle with an air inlet and a liquid extraction hole, which are respectively connected to the drug output pipeline and the air input pipeline; the needle is inserted into the drug container, and the air inlet maintains the air pressure balance inside the drug container; the liquid extraction hole and the bypass hole are connected to deliver the drug through the pipeline; the liquid inlet of the peristaltic pump is connected to the bypass of the needle holder through a silicone hose.

[0005] Operating mechanism: Simplified operation: Press the holder containing the drug container into the device, the device will automatically vent air, apply the device to the injection site (such as the abdomen), press the start button, the intelligent module will automatically withdraw the needle and inject, and automatically withdraw the needle after injection, without the need for manual puncture or injection. Reduce pain and needle phobia: Use short needles (5-6mm) and fine needles (30G or finer, such as 31G). Short needles avoid penetrating the muscle layer (where nerves are more abundant, causing more pronounced pain), while fine needles reduce cutting damage to subcutaneous tissue. The needle is not visible throughout the procedure, effectively resolving the patient's needle phobia. Improved accuracy: The dosage error of the pre-filled cartridge is ≤ ±0.5%. The intelligent module monitors the injection status in real time through a pressure sensor and automatically stops if there is a blockage, ensuring accurate dosage. Safety guaranteed: The device has a built-in automatic exhaust system, and the patch layer uses a breathable membrane to avoid stuffiness and redness.

[0006] have: The automatic needle insertion and withdrawal function with delay completely eliminates "needle phobia" and is suitable for children, the elderly or people with sensitive skin; The patch-like structure facilitates the injection of large doses of drugs, avoiding the inconvenience caused by medical staff holding the syringe for a long time. Intelligent sensing and chip control are adaptable to different drugs, such as insulin and growth hormone, making them highly versatile.

[0007] In a preferred embodiment of the present invention, the resilient fastening mechanism includes A pre-positioning slot is used for mechanical positioning during the initial installation of the drug container; The trigger-type latch, when the drug container is pressed to the second latching position, triggers the micro switch of the installed micro switch board to power on the PCBA and start the electronic control unit.

[0008] In a preferred embodiment of the present invention, the PCBA integrates an electronic control unit comprising a toggle switch, a geared motor, a vibration motor, a buzzer, and sensors; the electronic control unit includes a closed-loop monitoring system. Angle sensor, which monitors the application tilt angle of the device in real time, triggers a buzzer alarm and stops the injection when the angle exceeds the limit; A bubble sensor is installed in the liquid inlet channel of the needle assembly to detect bubbles in the liquid and send the detection signal to the electronic control unit. The electronic control unit controls the peristaltic pump to start and stop based on the received signal. When the injection is completed, a triple signal is given through the buzzer, the vibration motor and the indicator light.

[0009] In a preferred embodiment of the present invention, a power supply unit is further included to provide electrical power to the device. The needle assembly is provided with a drug residue optimization structure to optimize the drainage of drug at the needle tip. The needle assembly is provided with a needle cotton pad for collecting residual venting liquid. A cross groove is formed in the middle of the needle cotton pad for needle protection.

[0010] In a preferred embodiment of the present invention, the lower cover is rotatably fitted with a lower cover rotating plate for rotating and holding the outer shell assembly within a certain angle; the outer shell assembly has a built-in motherboard, which is the core driver of electrical functions.

[0011] In a preferred embodiment of the present invention, the optimized structure for drug residue includes: opening a U-shaped inlet hole on the beveled side of the end of the needle to increase the drainage channel; and using an angle sensor to force the device to operate within the permissible tilt angle range to maximize the emptying of the drug solution.

[0012] In a preferred embodiment of the present invention, a sterile barrier unit is further included to isolate external dust and moisture from entering the device; the needle assembly is provided with a needle cap, which is used for needle protection and needle insertion / exit positioning.

[0013] In a preferred embodiment of the present invention, the sound outlet area of ​​the buzzer is covered with a buzzer dustproof mesh for sound penetration and dust and water protection of the outer shell; the water-resistant non-woven fabric backing adhesive is a medical double-sided coating structure, which is soft, fits well, and has good long-term adhesion.

[0014] In a preferred embodiment of the present invention, the buzzer dustproof mesh is attached to the internal positioning groove of the upper cover, the micro switch board is used to power on the device by assembling the drug container into place, and the air inlet of the needle bracket is fixed with an air inlet dustproof mesh for filtering the air inlet and keeping the air inlet from being blocked.

[0015] In a preferred embodiment of the present invention, an upper cover bracket is provided between the upper cover and the lower cover. The upper cover bracket is a modular integrated structure, including an integrally formed button mounting position, indicator light, viewing window and fixing slot; the buckle is fixed to the outer shell assembly by screws to realize the quick assembly of motor, battery and pipeline.

[0016] In a preferred embodiment of the present invention, the lower cover edge is provided with embedded pins for mounting the screws; four embedded pins are provided for fixing the screws of the BOSS pillar inside the upper cover; two screws are used to fix the upper cover and the lower cover, and the other two screws are used to fix the motherboard, which facilitates disassembly and maintenance.

[0017] In a preferred embodiment of the present invention, the power supply unit includes a battery bracket and a battery fixed thereto; an adhesive component is provided at the bottom of the lower cover, the adhesive component being used for fixing the device and applying the injection skin; medical double-sided non-woven fabric and woven adhesive are used, with a water-resistant spunlace non-woven fabric backing, which is soft, fits well, and has good adhesion; and light-shielding foam is included, the light-shielding foam being used for light shielding of the motherboard LED to solve the problem of light leakage.

[0018] In a preferred embodiment of the present invention, the sterile barrier unit includes a buzzer dustproof mesh, absorbent cotton disposed at the air inlet, and a water-resistant non-woven fabric backing adhesive; the drug container and the drug container support are fixedly fitted inside the outer shell assembly; the drug container support is used for pre-positioning and secondary positioning of the drug container.

[0019] Key step: The drug container is directly loaded into the syringe device, eliminating the need for secondary transfer of the drug solution and avoiding drug contamination.

[0020] Battery power is dependent on the loading of the drug container. When the drug container is pressed to the puncture site, the outer plastic shell of the drug container will activate the microswitch, start the power supply, and vent the air.

[0021] When the exhaust process is complete, the device will sound a buzzer to indicate that the exhaust process is finished.

[0022] Tear off the release film on the back of the syringe, place the device horizontally on the injection site, and turn on the power switch. The peristaltic pump will then start the injection.

[0023] The device contains an angle sensor. When the application angle of the device exceeds a certain range, the system will issue an alarm, and injection can only be performed when the device is within the acceptable angle range.

[0024] The U-shaped inlet hole at the needle head of the device's drug container allows the liquid inside the container to be drawn out through the U-shaped hole when the device is tilted at a certain angle, regardless of the size and direction of the needle's bevel.

[0025] The outer frame of the drug container has a hinged structure. When the drug container and frame are pre-installed in the first elastic snap-fit ​​position, the hinged structure can restrict the position of the drug container and prevent it from being pressed into the second elastic snap-fit ​​position. When in use, the hinged structure is pulled off, and the drug container and frame are pressed into the second elastic snap-fit ​​position. The side micro switch is pressed to complete the power-on action.

[0026] When the needle of the needle holder is inserted into the drug container, due to the difference in the angle of the needle and the X / Y direction of the needle fixation, when the device is tilted at a certain angle, the liquid medicine cannot completely enter the needle, resulting in liquid medicine residue in the drug container. The solution is to use circuit board angle sensing technology to control the device to be used within a certain range, and to make a U-shaped hole on the opposite side of the bevel at the end of the needle to maximize the delivery of liquid medicine.

[0027] During the injection process, a bubble sensor monitors for excessively large bubbles, and an audible, visual, and tactile alert is generated upon completion of the injection, which then stops the peristaltic pump.

[0028] It uses medical double-sided non-woven fabric and woven adhesive: it adopts water-resistant spunlace non-woven fabric backing, which is breathable, soft and comfortable, and has good adhesion.

[0029] The structure is simple, using an upper cover bracket to fix the motherboard, motor, battery, needles, and tubing. The upper and lower covers are secured with screws and clips. Assembly, maintenance, and disassembly are convenient.

[0030] The top cover bracket integrates a transparent window, power button, and light guide column. Compared with the traditional separate component design, it eliminates the need for additional assembly of various parts, reducing the number of parts, saving costs, and improving production efficiency and quality yield.

[0031] The design of the rotating plate on the bottom cover solves the problem of triggering angle alarms due to excessive tilt angle after the device is attached. When the device tilt angle is too large, the device is already attached and cannot be removed and reattached. The device can be rotated to a certain angle within the allowable range without removing the device. This achieves angle correction without disassembly while attached, solving the problem of false alarms and reattachment caused by tilt angle deviation in traditional wearable syringes. At the same time, it meets the stringent requirements for reliability and safety of medical devices.

[0032] 1. Transfer-free direct-fill design for drug containers Pre-filled drug containers are directly loaded into the device, eliminating the drug transfer step and the risk of contamination. The outer frame of the drug container uses a flexible fastening mechanism; During pre-installation, it is confined to the first locking position by a hinged structure; When in use, pull off the hinged structure and press it into the second latching position to trigger the side micro switch, which automatically powers on the device and vents the pipeline. The venting hole of the insertion pin is set higher than the liquid extraction hole to prevent air from being drawn in and forming bubbles while extracting liquid.

[0033] 2. Intelligent injection control closed loop A buzzer sounds to indicate exhaust is complete → peel off the release paper and apply the device horizontally to the injection site → press the start button to inject; The gyroscope angle sensor monitors the application tilt angle in real time; if the angle exceeds the limit, an alarm is triggered and injection is prohibited. The bubble sensor monitors bubbles in the medication solution. When the injection is finished, the bubble sensor triggers a shutdown, simultaneously activating a buzzer, a vibration motor, and an indicator light for triple reminder.

[0034] 3. Drug residue optimization technology To address residue issues caused by the rubber stopper structure of the drug container; the bottom of the needle suction port is designed as a U-shaped elongated hole with a large drainage channel; and the device is forced to operate within the permissible tilt angle range by an angle sensor to ensure maximum drug delivery.

[0035] 4. Mechanism and Reliability Design The gear and rack system simplifies needle insertion; the motor rotates forward to drive the needle to extend, and the needle automatically retracts after injection (replacing the traditional lead screw structure). Modular top cover bracket: integrates buttons, windows, and indicator lights, and integrates the motherboard / motor / battery / pipeline. The upper and lower covers are fixed by screws and clips, which reduces costs while improving production efficiency and yield, and facilitates assembly and maintenance. The rotating lower cover design, in conjunction with a gyroscope, triggers an alarm if the device's tilt angle exceeds the system's maximum after the patient has properly applied it. The patient simply rotates the device, which is then engaged by a ratchet on the rotating plate, quickly adjusting it to the desired tilt range and preventing reapplication caused by removing the device from the application site. The skin-adhesive layer uses medical-grade double-sided water-resistant non-woven fabric backing adhesive, which is breathable, soft, and provides reliable adhesion.

[0036] Beneficial effects: 1. By integrating pre-filled drug containers directly, employing an intelligent triggering mechanism, and utilizing a multi-sensor closed-loop monitoring system, the system addresses issues such as secondary drug transfer contamination, structural complexity, and drug residue. The drug container's outer frame utilizes a two-stage elastic locking mechanism. During pre-filling, the hinged structure limits the container to the first locking position; during use, pulling off the hinged structure and pressing it to the second locking position triggers a lateral microswitch, automatically powering on and venting the system. Pre-filled drug containers are directly loaded into the device, eliminating drug transfer steps and preventing contamination risks. 2. Angle sensor monitors the application tilt angle in real time. If the angle exceeds the limit, an alarm is triggered and injection is prohibited. Bubble sensor monitors air bubbles in the medication. When injection is completed, the bubble sensor triggers a shutdown, and a buzzer, vibration motor, and indicator light are activated simultaneously as a triple reminder. 3. To address the residue caused by the spherical structure of the rubber stopper in the drug container, drainage holes are added to the beveled side of the needle end to form a multi-directional drainage channel; the angle sensor forces the device to operate within the permissible tilt angle range to ensure maximum drug delivery; 4. Improves the timing of needle insertion during application of traditional devices by eliminating direct visual stimulation to the user through a 0.5-5 second buffer period (preferably 2 seconds); a geared motor replaces manual pressing for controllable needle insertion. The gear and rack design simplifies the process, with the forward rotation of the needle extension motor automatically retracting after injection; achieving full-process safety control from loading to injection, featuring a streamlined and reliable structure, convenient operation, and complete resolution of contamination and residue issues, significantly enhancing the experience of high-dose drug infusion. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is an exploded view of the wearable drug delivery device provided in the embodiments of this application; Figure 2 A three-dimensional structural diagram of the outer surface of the cover provided for an embodiment of this application; Figure 3 A three-dimensional structural diagram of the drug container mounting position provided in the embodiments of this application; Figure 4 A three-dimensional structural diagram of the drug container support provided in the embodiments of this application; Figure 5 A three-dimensional structural diagram of the top cover support provided in the embodiments of this application; Figure 6 A schematic diagram of the three-dimensional structure of the upper cover provided for an embodiment of this application; Figure 7 A schematic diagram of the three-dimensional structure of the snap-fit ​​provided for the embodiments of this application; Figure 8 A schematic diagram of the card slot three-dimensional structure provided for an embodiment of this application; Figure 9 A cross-sectional three-dimensional structural diagram is provided for the embodiments of this application; Figure 10A three-dimensional structural diagram of the power-on position provided for an embodiment of this application; Figure 11 A schematic diagram of the three-dimensional structure of the pin integrated dual-hole provided for the embodiments of this application; Figure 12 Exploded views provided for embodiments of this application; Figure 13 A three-dimensional structural diagram of the pin holder provided in the embodiments of this application; Figure 14 A cross-sectional perspective view of the pin holder provided in the embodiments of this application; Figure 15 A three-dimensional structural diagram of the bottom of the lower cover provided for an embodiment of this application; Figure 16 A schematic diagram of the internal three-dimensional structure of the lower cover provided for an embodiment of this application; Figure 17 A three-dimensional cross-sectional view of the lower cover provided for an embodiment of this application; Figure 18 An operation flowchart provided for the implementation of this application.

[0039] In the diagram: 1. Label; 2. Top cover; 3. Buzzer dustproof mesh; 4. Embedded nail; 5. Microswitch board; 6. Medicine container; 7. Medicine container support; 8. Gear motor; 9. Peristaltic pump; 10. Air intake dustproof mesh; 11. Needle support; 12. Needle cap; 13. Bottom cover; 14. Bottom cover rotating plate; 15. Needle pad; 16. Application assembly; 17. Screw; 18. Needle assembly; 19. Main board; 20. Top cover support; 21. Vibration motor; 22. Light-blocking foam; 23. Battery support; 24. Battery; 25. Dosage scale; 26. Medication viewing window area; 27. Buzzer hole; 28. Release film tear-off area; 29. ​​Non-woven fabric tear-off area; 30. Power button; 31. Indicator light; 34. Top cover support elastic clip; 5. Gear; 36. Rack; 37. Cap; 38. First columnar structure; 39. Bolt; 40. Light guide post; 41. Light-shielding foam; 42. PCBA screw hole; 43. Bubble sensor; 44. Battery card holder; 45. Battery bracket mounting position; 46. Screw hole position; 47. Vibration motor mounting position; 48. Second columnar structure; 49. Flexible tubing; 50. Peristaltic pump mounting position; 51. Microswitch board fixing position; 52. Toggle switch mounting position; 53. Raised step position; 54. Slot; 55. Pin insertion position; 56. Locking position; 57. Injection / pause button; 58. Flexible cantilever; 59. Indicator light position; 60. Transparent visualization window; 61. Through hole step; 62. Copper nail; 63. Dustproof mesh adhesive. 64. Buckle; 65. Slot; 71. Pull bar; 72. Overlap point; 73. Docking slot; 92. Second position; 93. Toggle switch lever; 94. Side wall of drug container support; 95. Needle air inlet; 96. Needle liquid inlet; 97. Bypass liquid inlet pipe; 98. Bypass end; 99. Raised step; 101. Lower cover of needle support; 102. Combined positioning hole; 103. Positioning groove one; 104. Positioning groove two; 105. Raised positioning post; 106. Positioning groove; 107. Needle; 108. Liquid inlet; 109. Air inlet; 110. Inclined air inlet hole; 111. Side mounting position of air inlet; 112. Inclined air inlet groove; 113. Horizontal liquid inlet groove; 114. Protrusion at the outlet of the liquid groove; 151. Left and right symmetry 152. Groove; 153. Pinhole area; 154. Guide slope; 155. Strap fixing position one; 156. Ratchet protrusion locking position; 157. Strap fixing position two; 158. Reinforcing rib; 159. Hook; 160. Through hole; 161. Cross post; 162. Reverse stop; 163. Retaining wall; 164. Positive stop; 165. Stop three; 167. Stop four; 168. Stop five; 171. Stop six; 173. Stop seven; 166. Vibration motor positioning groove; 169. Cross rib; 170. Guide rib; 172. Slot one; 174. Slot two; 175. Strap fixing groove two; 176. Raised cylindrical groove; 177. Four-section raised step; 178. Transition step one; 179. Transition step two. Detailed Implementation

[0040] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0043] Please see Figures 1-18 The present invention provides a wearable drug delivery device, including a shell assembly, a drug container support 7, a needle insertion-retraction mechanism, a drug delivery assembly, a needle support 11, and a needle assembly 18; The outer shell assembly includes an upper cover 2 and a lower cover 13, the upper cover 2 and the lower cover 13 are mated together; the upper cover 2 is provided with a positioning groove, and a label 1 is affixed to the positioning groove; the drug container support 7 is provided with an elastic fastening mechanism, which is used to limit the drug container support 7 to the first fastening position by a flip-up structure during pre-installation, and to pull off the flip-up structure to press the drug container support 7 to the second fastening position during use. The needle assembly 18 has a dual-channel structure, with channel one connected to the main needle and channel two connected to the liquid inlet; the needle insertion-retraction mechanism includes a rack 36, a gear 35 and a reduction motor 8, the rack 36 is fixed to the main needle, the gear 35 is coaxially fixed to the drive shaft of the reduction motor 8, and the rack 36 meshes with the gear 35; The drug delivery assembly includes a drug container 6 pre-filled with drug solution, a peristaltic pump 9, and connecting tubing; the outlet of the peristaltic pump 9 is connected to the needle assembly 18 via a silicone hose; used to draw the drug solution from the drug container 6 and deliver it to the main needle. The needle holder 11 is provided with a needle 107, which is a double-hole needle with an air inlet oblique hole 110 and a liquid extraction hole 108, which are respectively connected to the liquid output pipeline and the air input pipeline. The needle 107 is inserted into the drug container 6, and the air inlet oblique hole 110 maintains the air pressure balance in the drug container 6. The liquid extraction hole 108 is connected to the bypass hole to deliver the liquid through the pipeline. The inlet of the peristaltic pump 9 is connected to the protruding positioning groove 105 on one side of the needle holder 11 through a silicone hose.

[0044] In a specific embodiment of the present invention, the elastic fastening mechanism includes A pre-positioning slot is used for mechanical positioning of the drug container 6 during the initial installation phase. The trigger-type latch, when the drug container 6 is pressed into the second latching position, triggers the micro switch of the installed micro switch board 5 to power on the PCBA and start the electronic control unit.

[0045] In a specific embodiment of the present invention, the PCBA integrates an electronic control unit comprising a toggle switch, a reduction motor 8, a vibration motor 21, a buzzer, and sensors; the electronic control unit includes a closed-loop monitoring system. Angle sensor, which monitors the application tilt angle of the device in real time, triggers a buzzer alarm and stops the injection when the angle exceeds the limit; A bubble sensor 43 is installed in the liquid inlet channel of the needle assembly 18 to detect bubbles in the liquid and send the detection signal to the electronic control unit. The electronic control unit controls the peristaltic pump 9 to start and stop based on the received signal. When the injection is completed, a triple signal is given through the buzzer, the vibration motor 21 and the indicator light 31 to remind the user.

[0046] In a specific embodiment of the present invention, a power supply unit is also included to provide electrical power to the device. The needle assembly 18 is provided with a drug residue optimization structure to optimize the drainage of drug residue at the end of the needle 107. The needle assembly 18 is provided with a needle cotton pad 15, which is used to collect residual venting liquid. A cross groove is formed in the middle of the needle cotton pad 15 for needle protection.

[0047] In a specific embodiment of the present invention, the lower cover 13 is rotatably fitted with a lower cover rotating piece 14, which is used to rotate and hold the outer shell assembly within a certain angle; the outer shell assembly has a built-in motherboard 19, which is the core driver of electrical functions.

[0048] In a specific embodiment of the present invention, the optimized structure for drug residue includes: opening a U-shaped inlet hole 108 on the oblique side of the end of the insertion needle 107 to increase the drainage channel; and combining the angle sensor to force the device to work within the permissible tilt angle range to maximize the emptying of the drug liquid.

[0049] In a specific embodiment of the present invention, a sterile barrier unit is also included to isolate external dust and moisture from entering the device; the needle assembly 18 is provided with a needle cap 12, which is used for needle protection and needle insertion / exit positioning.

[0050] In a specific embodiment of the present invention, the sound outlet area of ​​the buzzer is covered with a buzzer dustproof mesh 3, which is used for sound penetration of the buzzer and dustproof and waterproof protection of the outer shell; the water-resistant non-woven fabric backing adhesive is a medical double-sided coating structure, which is soft, fits well, and has good long-term adhesion.

[0051] In a specific embodiment of the present invention, the buzzer dustproof mesh 3 is attached to the internal positioning groove of the upper cover 2, the micro switch board 5 is used to power on the device by assembling the drug container 6 into place, and the air inlet of the needle bracket 11 is fixed with an air inlet dustproof mesh 10 for filtering the air inlet and keeping the air inlet from being blocked.

[0052] In a specific embodiment of the present invention, an upper cover bracket 20 is provided between the upper cover 2 and the lower cover 13. The upper cover bracket 20 is a modular integrated structure, including an integrally formed button 57 mounting position, an indicator light 31, and a viewing window 60. The internal mainboard PCBA 19 is fixed to the outer shell assembly by screws 17, so as to realize the quick assembly and disassembly of the motor, battery 24, and pipeline.

[0053] In a specific embodiment of the present invention, the lower cover 13 is provided with embedded nails 4 for mounting the screws 17 on its edge; four embedded nails 4 are provided for fixing the screws 17 of the BOSS pillar inside the upper cover 2; two screws 17 are used to fix the upper cover 2 and the lower cover 13, and the other two screws 17 are used to fix the motherboard 19, which facilitates disassembly and maintenance.

[0054] In a specific embodiment of the present invention, the power supply unit includes a battery bracket 23 and a battery 24 fixed thereto; the bottom of the lower cover 13 is provided with an applicator 16, which is used for fixing the device and applying the injection skin; medical double-sided non-woven fabric and woven adhesive are used, with a water-resistant spunlace non-woven fabric backing, which is soft, fits well, and has good adhesion; the PCBA19 is provided with light-shielding foam 22, which is used to shield the motherboard LEDs and solve the problem of light leakage.

[0055] In a specific embodiment of the present invention, the sterile barrier unit includes a buzzer dustproof net 3, absorbent cotton 10 disposed at the air inlet, and water-resistant non-woven fabric backing adhesive 16; the drug container 6 and the drug container support 7 are fixedly fitted inside the outer shell assembly; the drug container support 7 is used for pre-positioning and secondary positioning of the drug container 6.

[0056] In a specific embodiment of the present invention, the surface of the upper cover 2 is provided with a dosage scale 25, and the corresponding position represents the dosage of the drug solution at the corresponding position; the upper cover 2 is provided with a drug solution viewing window area 26 at the corresponding position, and the drug solution viewing window area 26 is integrated into the upper cover bracket 20; the upper cover 2 is provided with a buzzer hole 27; the adhesive component 16 is provided with a release film tear-off position 28 and a non-woven fabric tear-off position 29; in use, the release film of the adhesive component 16 is torn off, and the device is applied to the injection site (the buckle-type waist belt at both ends can be used as an optional function to increase the double protection of the application), and then... The pre-filled drug container 6 is pressed into place upon power-on and venting. It features an automatic needle dispensing mechanism, integrated sterile tubing for injection, an automatic needle retraction mechanism, bubble detection, tubing blockage detection, and angle detection. The entire system adopts a portable "plug-and-play" design. Its core logic integrates the processes of "drug loading, puncture, venting, needle dispensing, injection, and needle retraction" into a single sterile system through the synergy of mechanical structure and intelligent control. This significantly simplifies patient operation and addresses the pain points of traditional syringes, such as cumbersome drug loading, painful punctures, and inaccurate dosages, enabling portable injection therapy. The upper cover 2 also features an injection start button 30; the upper cover support 20 has indicator lights 31 on its side wall. In a specific embodiment of the present invention, the drug container support 7 is provided with a semi-opening pull strip 71. One end of the pull strip 71 is provided with an overlap point 72 at the connection between it and the drug container support 7. When the pull strip 71 is opened, the pull strip 71 is disconnected from the four overlap points 72, and the pull strip 71 and the drug container support 7 are separated. The pull strip 71 is used for pre-assembly limiting the drug container 6 assembly at the first fastening position of the device. In a specific embodiment of the present invention, a docking slot 73 is provided on one side of the drug container support 7. The docking slot 73 includes a first slot section and a second slot section. The first slot section is used for pre-locking the drug container 6 assembly and the device during installation. The second slot section is used for pressing the drug container 6 assembly and the device into place and locking them in place.

[0057] In a specific embodiment of the present invention, the upper cover bracket 20 integrates an injection start button 30, a liquid viewing window area 26, and an indicator light 31, and is used to fix related internal components; the vibration motor 21 provides a vibration function for vibration reminders during operation; the battery bracket 23 is used to fix the battery 24 and the circuit connection between the battery 24 and the main board 19; the battery 24 is a disposable battery that provides power for the entire device.

[0058] In a specific embodiment of the present invention, the needle holder 11 is provided with a liquid inlet hole 108, which is connected to a bypass liquid inlet pipe 97. The air inlet hole 109 is provided with a vertical bypass, and a filter screen 10 is attached to the end 98 of the bypass. The liquid inlet hole 108 and the air inlet hole 109 are set with a height difference to avoid air being sucked in by the liquid inlet hole 108, which would cause air bubbles. The needle 107 integrates two holes to ensure that the air pressure inside the drug container 6 is balanced, and the drug liquid can be extracted.

[0059] Please see Figure 5 The upper cover bracket 20 and the drug container bracket 7 are engaged by the upper cover bracket elastic clip 34; the head of the reduction motor 8 is provided with a gear 35; the needle assembly 18 is provided with a rack 36, which meshes with the gear 35; the needle cover 12 is located above the needle assembly 18, and the top of the needle assembly 18 is provided with a cap 37, which engages with the upper cover bracket 20, and one end is fixed to the main board 19 by a screw 17; the first columnar structure 38 of the upper cover bracket 20 is provided with a flexible tube 49 to prevent the tube from bending and causing blockage; two screws 17 are provided on the right side of the main board 19, and the screws 17 are fixed to the upper cover bracket 20; the upper cover bracket 20 integrates a light guide column 40; a light-shielding foam 41 is provided between the light guide column 40 and the main board LED.

[0060] The lower cover 13 is provided with PCBA screw hole 42 is used to fix the top cover 2, the back cover, and the PCBA. Bubble sensor 43 is used for bubble detection in flexible pipe 49; The disposable battery symmetrical locking slot 44 is used to install and fix the battery 24; Battery bracket mounting position 45, the battery clip 44 is installed in the mounting position.

[0061] The motherboard 19 has a screw hole 46 on the left side. The bottom of the screw hole 46 cooperates with the upper cover screw post to fix the lower cover 13. The motherboard 19 is provided with a vibration motor mounting position 47 for mounting a vibration motor 21; The upper cover support 20 is provided with a second columnar structure 48, around which the flexible pipe 49 bypasses to prevent the pipe from bending and causing blockage. The upper cover 2 has a built-in flexible tube 49, one end of which is connected to the liquid output hole of the needle bracket 11 and the other end is connected to the liquid input hole of the needle assembly 18. The upper cover 2 has a peristaltic pump mounting position 50, and the peristaltic pump 9 is engaged with the peristaltic pump mounting position 50 in the upper cover bracket 20; The upper cover 2 has a built-in micro switch plate fixing position 51 for fixing to the side of the upper cover bracket 20; The toggle switch mounting position 52 is located on the side of the small plate in the downward direction of the drug container 6; The needle holder 11 is provided with a raised step position 53, and the raised step position 53 is provided with a raised step 99 for cooperating with the guide groove of the drug container holder 7. The pin bracket 11 is engaged in the slot 54 of the upper cover bracket 20; The needle holder 11 is provided with a needle insertion station 55, and the needle insertion station 55 is provided with a needle 107 for cooperating with the drug container 6. After engagement, the drug liquid is extracted. The upper cover bracket 20 is provided with a locking position 56 to lock the reduction motor 8.

[0062] Please see Figure 6 The upper cover bracket 20 integrates an injection / pause button 57; an elastic cantilever 58 connects the upper cover bracket 20 and the injection / pause button 57; the upper cover bracket 20 integrates an indicator light station 59; the upper cover bracket 20 is provided with a transparent visualization window 60; the upper cover bracket 20 has through-hole steps 61 in four places for fixing the motherboard 19 and the upper cover 2.

[0063] Please see Figure 7-8 The copper nail 62 and the top cover 2 are integrally formed to form the embedded nail 4; the four through holes and steps 61 are used to fix the motherboard PCBA19 and the top cover 2; It also includes a dustproof mesh adhesive 63, which is attached to the internal positioning groove of the upper cover 2; used to fix the dustproof mesh 3, ensuring the sound of the buzzer can be transmitted and the outer shell is dustproof and waterproof; The inner side of the upper cover 2 is provided with a certain number of buckles 64 for engaging with the upper cover bracket 20; the upper cover bracket 20 is provided with a certain number of slots 65 around its perimeter for engaging with the buckles 64 on the inner perimeter of the upper cover 2.

[0064] Please see Figure 9 The rack 36 on the main needle assembly 18 meshes with the gear 35 of the reduction motor 8. The gear 35 is located at the second angle, and the needle assembly 18 is located at the second meshing position (needle exit position). The main needle is fixed on the needle assembly bracket, and the main needle is located in the second position 92 (needle exit position); The lower plane of the needle assembly bracket contacts the bottom surface of the needle cap 12 needle holes, limiting the needle travel.

[0065] Please see Figure 10-11 When the drug container 6 is pressed to the second position 92, the side wall 94 of the drug container support drives the toggle switch lever 93 to the second position 92, i.e. the power-on position. The needle holder 11 has a main needle with an air inlet 95 and a liquid inlet 96. The liquid inlet 96 is connected to a bypass liquid inlet pipe 97. The air inlet 95 has a vertical bypass, and a filter screen is attached to the end 98 of the bypass. The liquid inlet 96 and the air inlet 95 are set at different heights to prevent air from being sucked in and causing bubbles. The needle 107 integrates two holes to ensure that the air pressure inside the drug container 6 is balanced and the drug can be extracted.

[0066] Please see Figure 12-14The needle holder 11 is provided with a raised step 99 and a needle 107; the raised step 99 and the drug container holder 7 are positioned in a groove. The pin holder upper cover and the pin holder lower cover 101 are provided; It is provided with positioning holes 102 for the upper and lower covers of the pin holder; The room is equipped with a positioning groove 103 and a positioning groove 2 104 for attaching an air intake dustproof mesh 10. It is equipped with a protruding positioning post 105, which engages with the upper cover bracket 20 through the insertion hole; It is provided with a positioning groove 106, which is engaged and positioned with the positioning post of the lower cover 13. The insert 107 is provided with a liquid inlet 108 and an air inlet 109; the air inlet 109 is higher than the liquid inlet 108. It is provided with an inclined hole connecting to the inclined air inlet hole 110; the horizontal air inlet slot is connected to the inclined air inlet slot 112. The air intake dust filter 10 is attached to the side mounting position 111 of the horizontal air intake; A horizontal liquid inlet tank 113 is provided; a protrusion 114 is provided at the outlet of the liquid outlet tank. The motherboard 19 is equipped with a buzzer; the upper cover 2 has a buzzer sound hole; the buzzer sound hole dustproof mesh is attached between the upper cover 2 and the upper cover bracket 20; the lower cover 13 has a through hole on the left side for bolt fixing; the upper cover 2 and the lower cover 13 are fixed on the right side by the lower cover buckle; the fixing method takes into account cost, reliability and maintainability.

[0067] Please see Figure 15-17 The lower cover 13 is provided with symmetrical grooves 151 to increase elasticity; the lower cover 13 is provided with a pinhole area 152 in the middle; The edge of the pinhole area 152 is provided with a guide slope 153; The lower cover 13 is provided with a pull strap fixing position 154 and a pull strap fixing position 156 at both ends; The surface of the lower cover 13 is provided with a ratchet protrusion locking position 155; The inner side of the lower cover 13 is provided with reinforcing ribs 157 for structural reinforcement. The lower cover 13 is provided with a hook 158 and an upper cover bracket 20 for engagement; The lower cover 13 has a through hole 159 in the middle; The lower cover 13 is provided with a cross post 160, which cooperates with the cylindrical upper cover bracket 20; The lower cover 13 is provided with a reverse stop 161 and a forward stop 163 for cooperating with the upper cover 2; specifically, multiple stops are provided around the lower cover 13, including stop 2 164, stop 3 165, stop 4 167, stop 5 168, stop 6 171 and stop 7 173. The lower cover 13 is provided with a baffle 162 for shading light; The lower cover 13 is provided with a motor positioning groove 165, which is used to position the vibration motor 21. The lower cover 13 is provided with a cross rib 169, which cooperates with the insertion hole of the pin bracket 11; The lower cover 13 is provided with guide ribs 170, which are used to position the drug container support 7. The lower cover 13 is provided with a first slot 172 and a second slot 174, which engage with the upper cover 2; The lower cover 13 is provided with a vibration motor positioning groove 166 and a second pull strap fixing groove 175, which correspond to the first pull strap fixing position 154. The lower cover 13 is provided with a raised cylindrical groove 176, which contains a needle tip cotton pad 15; The lower cover 13 is provided with four raised steps 177, which engage with the groove of the needle cap 12; The inner wall of the lower cover 13 is provided with a transition step 178 and a transition step 179, which are fastened to the lower cover rotating piece 14.

[0068] Automatic exhaust procedure: (a) When the pre-filled drug container 6 is installed into the drug container holder 7 in the device, a positioning completion signal for the drug container 6 is triggered; (b) In response to the positioning completion signal of the drug container 6, the rubber stopper of the drug container 6 is driven to cooperate with the needle assembly to form a closed infusion loop; (c) Based on the establishment of the closed infusion pipeline, activate the micro switch to start the device and supply power; (d) The peristaltic pump 9 is started and operated by the trigger signal of the micro switch; (e) Using the suction action of the peristaltic pump 9, the liquid medicine is transported from the inlet pipe to the outlet pipe until the liquid medicine reaches the injection needle position; (f) After detecting that the injection needle is full of medicine, stop the peristaltic pump 9 and complete the venting operation.

[0069] Delayed needle withdrawal after application: After the patch component 16 is fixed to the injection site, the user triggers the injection / pause button 57. The control component receives the injection / pause button signal 57 and sends a forward rotation command to the reduction motor 8 after a delay of 0.5-5 seconds; The reduction motor 8 drives the rack 36 of the needle assembly 18 through the gear 35, so that the needle can quickly extend to the injection depth; Automatic needle withdrawal via medication sensor: During the injection process, the bubble sensor 43 monitors the status of the medication in the silicone tubing in real time; when no medication is detected in the tubing, it sends a stop signal to the main board 19; the main board 19 outputs a reverse current to the reduction motor 8, driving the gear 35 to reverse; the reverse motion drives the needle of the needle assembly 18 to retract completely into the device through the rack 36.

[0070] Exhaust stage: After the microswitch on the microswitch board 5 is triggered, the peristaltic pump 9 starts until the bubble sensor 43 detects that the liquid medicine fills the needle; Injection stage: The user starts the injection / pause button 57, the reduction motor 8 rotates forward to drive the needle to extend, and the bubble sensor 43 monitors the status of the medicine in real time; End stage: Bubble sensor 43 triggers a stop signal, and reduction motor 8 reverses to retract the needle into the device, simultaneously activating a triple reminder of buzzing, vibration, and LED flashing.

[0071] How does this wearable drug delivery device work? Step 1: After pressing the medicine container into place, turn on the main power switch. A mechanical switch can be used to power the circuit board. At this time, the main power switch will switch from "off" to "on", and other components will be in the initial state.

[0072] Step 2: After the circuit is powered on, the peristaltic pump automatically starts to expel air from the tubing. When the air bubble detector changes from "air bubble" to "liquid," the peristaltic pump stops. Simultaneously, the angle detection function activates to assist the user in correctly placing the vial. If there is an abnormality in air venting or angle detection, the button switch will remain locked and cannot be operated. During this stage, the peristaltic pump's status changes from "stop → start → stop," the needle inlet / outlet motor remains "stop," the power and injection progress indicator lights change from "off" to "four green lights on," the vibration (drip window) function switches from "stop" to "start," and the motor shuts off after a 1-second delay upon detecting liquid (delay time adjustable).

[0073] Step 3: After pressing the button switch, the needle inlet / outlet motor starts, driving the needle to exit until the motor triggers overload protection and disconnects the power. At this time, the status of the needle inlet / outlet motor is "stop → start → stop"; the peristaltic pump remains "stop"; the tubing bubble detector remains in "liquid" state; the power and injection progress indicator lights show "all 4 are green"; the vibration (drip window) has no action; "press the button and wait 3 seconds for the needle to exit into place, the vibration pump does not start".

[0074] Step 4: After waiting 3 seconds, the peristaltic pump starts to infuse the medication. The indicator lights flash according to the injection progress (3 lights on and 1 flashing at 25% progress; 2 lights on and 2 flashing at 50% progress). Simultaneously, the vibratory pump starts, and the injection progress is related to the vibratory pump flow rate. During this stage, the peristaltic pump status changes from "stop → start," the needle inlet / outlet motor remains "stop (needle outlet state)," the tubing air bubble detector remains "liquid," and the button switch is in "wait" state. In case of special circumstances, proceed to Step 5 (optional): Pressing the power button pauses the injection (the peristaltic pump switches from "start" to "stop"). The pause time is not counted in the injection time, and the injection can be resumed / paused multiple times. After completing the injection, continuously pressing the button turns off the power. During this stage, the tubing air bubble detector remains "liquid," the needle inlet / outlet motor remains "stop (needle outlet state)," and the power and injection progress indicator lights remain at the current progress state.

[0075] Step 6: When the injection time exceeds the set time and the tubing bubble detector changes from "liquid" to "bubble", the peristaltic pump stops; after waiting 5 seconds, the needle inlet / outlet motor reverses (retracts the needle) until it stops due to overload protection; after needle retraction, wait 3 seconds, all indicator lights will turn off and the buzzer will sound for 3 seconds to indicate completion. During this stage, the peristaltic pump status changes from "stop → start → stop", the needle inlet / outlet motor status changes from "stop → reverse → stop", and the power and injection progress indicator lights show "all 4 needles off".

[0076] Step 7: The injection process is complete. At this time, the main power switch remains "on", the peristaltic pump and the inlet / outlet needle motors are both "off", the tubing bubble detector stops detecting, the button switch is in the "locked (can be reset after power failure)" state, and all components return to their pre-standby state.

[0077] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A wearable drug delivery device, characterized in that, include The outer casing assembly includes an upper cover (2) and a lower cover (13), the upper cover (2) and the lower cover (13) being fitted together; the upper cover (2) is provided with a positioning groove, and a label (1) is affixed to the positioning groove. The drug container support (7) is provided with an elastic fastening mechanism, which is used to limit the drug container support (7) to the first fastening position by means of a flip-up structure when pre-installed, and to press the drug container support (7) to the second fastening position by breaking the flip-up structure when in use. Needle assembly (18), the needle assembly (18) is a dual-channel structure, with channel one connected to the main needle and channel two connected to the liquid inlet; The needle insertion-retraction mechanism includes a rack (36), a gear (35), and a reduction motor (8). The rack (36) on the needle assembly (18) is fixed to the main needle head, and the gear (35) is coaxially fixed to the drive shaft of the reduction motor (8). The rack (36) meshes with the gear (35). The drug delivery assembly includes a drug container (6) pre-filled with drug solution, a peristaltic pump (9), and connecting tubing; the outlet of the peristaltic pump (9) is connected to the needle assembly (18) via a silicone hose; used to draw the drug solution from the drug container (6) and deliver it to the main needle. A needle holder (11) is provided with a needle (107). The needle (107) is a double-hole needle and is provided with an air inlet (109) and a liquid extraction hole (108), which are respectively connected to the liquid output pipeline and the air input pipeline. The needle (107) is inserted into the drug container (6). The air inlet (109) maintains the air pressure balance in the drug container (6). The liquid extraction hole and the bypass hole are connected to deliver the liquid through the pipeline. The liquid inlet of the peristaltic pump (9) is connected to the bypass of the needle holder (11) through a silicone hose.

2. The wearable drug delivery device according to claim 1, characterized in that, The elastic fastening mechanism includes A pre-positioning slot is provided for mechanical positioning of the drug container (6) during the initial installation phase. The trigger-type latch, when the drug container (6) is pressed to the second latching position, the micro switch of the installed micro switch board (5) triggers the PCBA to power on and starts the electronic control unit.

3. The wearable drug delivery device according to claim 2, characterized in that, The PCBA integrates an electronic control unit containing a toggle switch, a geared motor (8), a vibration motor (21), a buzzer, and sensors; the electronic control unit includes a closed-loop monitoring system. Angle sensor, which monitors the application tilt angle of the device in real time, triggers a buzzer alarm and stops the injection when the angle exceeds the limit; A bubble sensor (43) is installed in the liquid inlet channel of the needle assembly (18) to detect bubbles in the liquid and send the detection signal to the electronic control unit. The electronic control unit controls the peristaltic pump (9) to start and stop based on the received signal. When the injection is completed, the buzzer, vibration motor (21) and indicator light (31) provide a triple signal reminder.

4. A wearable drug delivery device according to claim 3, characterized in that, It also includes a power supply unit to provide electrical power for the equipment. The needle bracket (11) is provided with a drug residue optimization structure to optimize the drainage of drug residue at the end of the needle (107). The needle assembly (18) is provided with a needle cotton pad (15), which is used to collect residual venting liquid. A cross groove is opened in the middle of the needle cotton pad (15) for needle protection.

5. A wearable drug delivery device according to claim 1, characterized in that, The lower cover (13) is rotatably fitted with a lower cover rotating plate (14) for rotating and holding the outer shell assembly within a certain angle; the outer shell assembly has a built-in motherboard (19) which is the core driver of electrical functions.

6. A wearable drug delivery device according to claim 4, characterized in that, The optimized structure for residual drug solution includes: opening a U-shaped inlet hole (108) at the end of the insertion needle (107) to increase the drainage channel; and combining the angle sensor to force the device to work within the permissible tilt angle range to maximize the emptying of the drug solution.

7. A wearable drug delivery device according to claim 1, characterized in that, It also includes a sterile barrier unit for isolating external dust and moisture from entering the device; the needle holder (11) is provided with a needle cap (12), which is used for needle protection and needle insertion / exit positioning.

8. A wearable drug delivery device according to claim 1, characterized in that, The sound outlet area of ​​the buzzer is covered with a buzzer dustproof mesh (3) for sound penetration and dust and water protection of the outer shell.

9. A wearable drug delivery device according to claim 1, characterized in that, A non-woven fabric backing adhesive is attached to the bottom of the rotating piece (14). The water-resistant non-woven fabric backing adhesive is a medical double-sided coating structure, which is soft, fits well, and has good long-term adhesion.

10. A wearable drug delivery device according to claim 8, characterized in that, The buzzer dustproof net (3) is attached to the inside of the upper cover (2). The micro switch board (5) is used to power on the device by assembling the drug container (6). The air inlet of the needle bracket (11) is fixed with an air inlet dustproof net (10) for filtering the air inlet and keeping the air inlet from being blocked.

11. A wearable drug delivery device according to claim 1, characterized in that, An upper cover bracket (20) is provided between the upper cover (2) and the lower cover (13). The upper cover bracket (20) is a modular integrated structure, including an integrally formed button mounting position, indicator light (31), viewing window, motherboard PCBA6, and upper cover bracket (20). The upper cover bracket (20) is fixed to the lower cover 13 by screws (17) to realize the rapid assembly and disassembly of components.

Images