A wearable drug delivery system

Abstract

This invention relates to the field of devices for introducing media into or onto the human body, and more particularly to a wearable drug delivery system. It includes a base, a liquid aspiration device, and an injection device. The liquid aspiration device includes a liquid aspiration actuator and an unlocking mechanism; the injection device includes an injection actuator and a timing control mechanism; the liquid aspiration actuator is pre-locked in a ready-to-launch position and moves toward a target position after being unlocked; the unlocking mechanism abuts against the liquid aspiration actuator in the ready-to-launch position, at least a portion of which protrudes from the bottom of the base and is movably disposed, simultaneously releasing the lock of the liquid aspiration actuator during the base's contact process; the injection actuator is pre-configured with a needle insertion stroke and a needle return stroke, and has a controlled portion; the timing control mechanism has a first control arm and a second control arm, which alternately abut against the controlled portion, corresponding to the start of the needle insertion stroke and the start of the needle return stroke, respectively.

Description

Technical Field

[0001] This invention relates to the field of devices for introducing media into or onto the human body, and more particularly to a wearable drug delivery system. Background Technology

[0002] With the development of biomedical technology, subcutaneous injection has become the mainstream treatment for many chronic diseases such as diabetes and growth hormone deficiency. To improve the convenience, privacy, and compliance of patients, wearable automated drug delivery systems have emerged. These devices typically integrate drug storage, delivery, and injection functions, aiming to reduce the inconvenience and discomfort of frequent manual injections.

[0003] However, existing wearable drug delivery systems have the following problems.

[0004] In terms of operation, many systems do not achieve true "one-click start." Users often need to perform multiple steps, such as manually attaching the device to the skin and then triggering the drug absorption or injection procedure through a separate button or command. This multi-step operation not only increases the complexity of use but also easily leads to drug delivery failure due to operational errors. Summary of the Invention

[0005] The purpose of this invention is to provide a wearable drug delivery system to solve the problem of cumbersome operation in existing wearable drug delivery systems.

[0006] The technical solution of the present invention is: a wearable drug delivery system, comprising:

[0007] The base, in the application scenario, has a bottom that is suitable for skin contact;

[0008] A liquid suction device, including a liquid suction actuator and an unlocking mechanism;

[0009] An injection device, including an injection actuator and a timing control mechanism;

[0010] The liquid suction actuator is pre-locked in the ready-to-launch position and moves toward the target position after being unlocked; the unlocking mechanism abuts against the liquid suction actuator in the ready-to-launch position, and at least a portion of the unlocking mechanism is movably protruding from the bottom of the base, and simultaneously unlocks the liquid suction actuator during the contact process with the base;

[0011] The injection actuator is pre-configured with a needle insertion stroke and a needle return stroke, and has a controlled part; the timing control mechanism has a first control arm and a second control arm, which alternately abut against the controlled part, respectively corresponding to the start of the needle insertion stroke and the start of the needle return stroke.

[0012] Preferably, a first elastic element is provided in the liquid suction device, and the first elastic element drives the liquid suction actuator to move toward the target position or has a tendency to move toward the target position;

[0013] A second elastic element is provided in the injection device, which drives the injection actuator to perform the needle insertion stroke and the needle return stroke; and

[0014] A control drive mechanism, which is connected to a timing control mechanism, is used to drive the first control arm and the second control arm to alternately abut against the controlled part.

[0015] Preferably, the injection actuator includes a first injection actuator and a second injection actuator;

[0016] One end of the second elastic element is connected to the base, and the other end is connected to the first injection actuator, enabling the first injection actuator to rotate around its own axis; the controlled part is disposed on the first injection actuator;

[0017] The second injection actuator is slidably connected to the base perpendicular to the plane of the base and has a fixed rotation angle relative to the base. The second injection actuator is engaged with the first injection actuator through a groove.

[0018] Preferably, the controlled part is opened around the axis of the first injection actuator and has an abutment end perpendicular to its own direction of movement. The abutment end abuts against the first control arm or the second control arm as the rotation angle of the first injection actuator relative to the base changes, so that the injection actuator is locked at the starting point of the needle insertion stroke or the starting point of the needle return stroke.

[0019] Preferably, the control drive mechanism includes a control driver and a control track fixed on the base. The control driver has a drive gear coaxially fixed at the actuation end, and a drive rack is provided on the timing control mechanism corresponding to the drive gear. The drive gear meshes with the drive rack, so that the timing control mechanism slides along the control track.

[0020] Preferably, a suction track is provided on the base in conjunction with the suction actuator, and a suction slot communicating with the suction track is provided perpendicular to the running direction of the suction track. The suction actuator slides along the suction track toward the target position or is engaged in the suction slot.

[0021] Preferably, the unlocking mechanism includes a trigger lever and an unlocking paddle;

[0022] One end of the trigger rod is hinged to the base, and the other end protrudes from the bottom of the base;

[0023] The unlocking paddle is configured to correspond to the liquid suction slot. One end is directly or via transmission connected to the hinged end of the unlocking lever, and the other end abuts against the liquid suction actuator in the ready-to-launch position. Under the drive of the trigger lever, an unlocking thrust is applied to the liquid suction actuator.

[0024] Preferably, the liquid suction actuator includes a liquid suction slider and a liquid suction locking block;

[0025] The liquid-absorbing slider is configured to remain slidably connected to the liquid-absorbing track, with one end away from the target position abutting against the first elastic element;

[0026] The liquid-absorbing lock block is pre-configured to engage with the liquid-absorbing slot. The liquid-absorbing lock block is slidably engaged with the liquid-absorbing slider and slides relative to the liquid-absorbing slider along the length direction perpendicular to the liquid-absorbing track under the action of the unlocking paddle.

[0027] Preferably, the device includes a needle assembly, which includes an infusion tube with an aspiration needle and an injection needle fixed at both ends of the infusion tube, respectively; the aspiration needle is connected to an aspiration actuator, and the injection needle is connected to an injection actuator.

[0028] Preferably, a pump is installed on the base, the pump being used to drive the liquid in the delivery tube to flow from the self-aspirating needle toward the injection needle.

[0029] Compared with the prior art, the advantages of the present invention are:

[0030] (1) Through ingenious mechanical design, this invention combines the initiation action of the entire drug delivery process with the necessary step of "attaching the device to the skin". The user only needs to complete two actions: placing the medicine bottle and attaching the device. The system can then automatically and continuously complete all subsequent steps. This eliminates the need for additional triggering operations and reduces the user's learning cost and usage threshold.

[0031] (2) This invention employs an unlocking mechanism based on the lever principle. The vertical pressure of the skin on the protruding pressing end is converted into a horizontal amplified pulling force on the liquid-absorbing locking block. This design can overcome the large spring preload and slot friction with a small skin contact force, achieving reliable unlocking. It avoids trigger failure or pressing pain caused by excessive unlocking force.

[0032] (3) By dividing the liquid aspiration actuator into a liquid aspiration slider and a liquid aspiration locking block, and restricting the slider to slide only along a straight track, while allowing the locking block to bear the vertical displacement during locking and unlocking, this design ensures that the liquid aspiration needle, which is directly connected to the slider, always moves in a straight line throughout the entire movement, effectively preventing needle wobbling and tilting, and ensuring that it can vertically and stably pierce the medicine bottle stopper in the best posture, greatly improving the first success rate and reliability of the drug aspiration process.

[0033] (4) This invention achieves precise program control of the three stages of needle insertion, drug injection, and needle return through the synergistic effect of the timing control mechanism and the injection execution mechanism. This scheme uses a single drive source to drive the timing control mechanism to slide, which can precisely switch the locking or releasing of the two control arms and the controlled part, making the mechanical structure relatively compact and conducive to the miniaturization and weight reduction of the equipment. Attached Figure Description

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0035] Figure 1 This is a structural diagram of a wearable drug delivery system according to the present invention;

[0036] Figure 2 This is a schematic diagram of the liquid suction actuator of the present invention in the locked position;

[0037] Figure 3 This is a schematic diagram showing the liquid suction actuator of the present invention located at the target position;

[0038] Figure 4 This is a schematic diagram of the liquid suction actuator in the locked state of the present invention, with the liquid suction track shown in bold lines;

[0039] Figure 5 This is a schematic diagram of the unlocked state of the liquid suction actuator described in this invention, with the liquid suction slot shown in bold lines;

[0040] Figure 6 This is a structural diagram of the unlocking mechanism described in this invention;

[0041] Figure 7 This is a schematic diagram showing the unlocking mechanism of the present invention before and after its operation;

[0042] Figure 8 This is a structural diagram of the injection device described in this invention;

[0043] Figure 9 This is an exploded view of the injection device described in this invention;

[0044] Figure 10 This is a first-view structural diagram of the injection actuator described in this invention;

[0045] Figure 11 This is a second-view structural diagram of the injection actuator described in this invention;

[0046] Figure 12 This is a structural diagram of the timing control mechanism described in this invention;

[0047] Figure 13 This is a first-view schematic diagram of the first working state of the timing control mechanism described in this invention, showing the starting point of the injection needle insertion stroke;

[0048] Figure 14 This is a second-view schematic diagram of the first working state of the timing control mechanism described in this invention;

[0049] Figure 15 This is a first-view schematic diagram of the second working state of the timing control mechanism described in this invention, showing the end point of the needle insertion stroke and the beginning point of the needle return stroke;

[0050] Figure 16 This is a second-view schematic diagram of the second working state of the timing control mechanism described in this invention;

[0051] The components include: 1. Base; 2. Liquid suction device; 21. Liquid suction needle; 22. Liquid suction actuator; 221. Liquid suction slider; 222. Liquid suction lock block; 23. First elastic element; 24. Liquid suction slot; 25. Liquid suction track; 26. Unlocking mechanism; 261. Trigger lever; 2611. Pressing end; 262. Unlocking lever; 2621. Actuating end; 263. Rotating shaft; 3. Injection device; 31. Injection needle; 32. Injection actuator; 321. 322. First injection actuator; 33. Second injection actuator; 34. Second elastic element; 35. Slide groove; 36. Downward section; 37. Upward section; 38. Timing control mechanism; 39. First control arm; 30. Second control arm; 31. Controlled part; 32. Abutment end; 33. Control drive mechanism; 34. Control driver; 35. Drive gear; 36. Drive rack; 37. Reversing switch; 4. Pump; 100. Medicine bottle. Detailed Implementation

[0052] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., 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 application 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 application.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0054] The present invention will be further described in detail below with reference to specific embodiments:

[0055] like Figure 1 As shown, a wearable drug delivery system has the core function of automatically completing the entire process of drawing liquid medicine from a medicine bottle 100 and injecting it into the user's subcutaneous tissue.

[0056] A wearable drug delivery system includes a base 1, a liquid suction device 2, an injection device 3, and a pump 4. In its application scenarios, it may also be equipped with components such as... Figure 2 The aspiration needle 21, the infusion tubing, and as shown are shown. Figure 9 The needle assembly consisting of the injection needle 31 shown is used to connect the aspiration device 2 and the injection device 3, and drives the liquid in the vial 100 to flow toward the injection needle 31 through the action of the pump 4.

[0057] The liquid aspiration device 2 and the injection device 3 are installed on the top surface of the base 1. The bottom surface of the base 1 is set as the attachment surface. The attachment surface is attached to the user's skin by adhesive, so that the injection device 3 can drive the needle assembly to penetrate the base 1 and insert it into the user's skin to inject the medicine under the skin.

[0058] The base 1 is designed as a plate-like structure, and is usually equipped with a shell to enclose the liquid aspiration device 2, the injection device 3, and the needle assembly. The phrase "the needle assembly penetrates the base 1" does not mean that the needle assembly penetrates the solid part of the base 1. Instead, the base 1 has a small hole corresponding to the injection assembly. When not in use, the small hole is sealed by a thin film. When in use, the injection device 3 can drive the needle assembly to pierce the thin film through the small hole on the base 1.

[0059] The base 1 is provided with a loading slot, which is used to hold the medicine bottle 100 that stores the medicine liquid, and the mouth of the medicine bottle 100 is set facing the liquid suction device 2. The position corresponding to the loading slot is the target position of the liquid suction device 2.

[0060] Regarding liquid suction device 2:

[0061] like Figure 2-4 As shown, the liquid aspiration device 2 is used to connect the liquid aspiration needle 21 to the medicine bottle 100, thereby enabling the extraction of liquid medicine from the medicine bottle 100. The liquid aspiration device 2 includes a liquid aspiration actuator 22, which is connected to the liquid aspiration needle 21 in the needle assembly. The end of the liquid aspiration actuator 22 away from the medicine bottle 100 abuts against a first elastic member 23. The end of the first elastic member 23 away from the liquid aspiration actuator 22 is fixed to the base 1, so that the first elastic member 23 can push the liquid aspiration actuator 22 together with the liquid aspiration needle 21 toward the target position, so that the needle tip of the liquid aspiration needle 21 pierces into the bottle and extracts the liquid medicine.

[0062] Because the medication needs to be used promptly after extraction to prevent air contamination, the above actions usually occur when the system is in use. To simplify the operation, the suction device 2 is configured such that the suction actuator 22 only starts to move the suction needle 21 to pierce the medicine bottle 100 and perform the suction operation when the base 1 is attached to the skin.

[0063] The specific methods are as follows: Figure 2 As shown, the suction actuator 22 is pre-locked in a ready-to-launch position away from the mouth of the medicine bottle 100. In this ready-to-launch position, the first elastic element 23 is compressed, thus possessing elastic potential energy. When the suction actuator 22 is released from the locked state, the first elastic element 23 releases the stored elastic potential energy, thereby pushing the suction actuator 22 toward the... Figure 3 Slide to the target position shown.

[0064] like Figure 4 and Figure 5 As shown, in this application, the locking of the suction actuator 22 is achieved through the suction slot 24. Specifically, a suction track 25 is provided on the base 1, and the suction slot 24 is provided perpendicular to the length direction of the suction track 25. The suction actuator 22 is pre-engaged in the suction slot 24, that is, the suction actuator 22 is pre-locked in the ready-to-go position.

[0065] The liquid suction slot 24 is connected to the liquid suction track 25, enabling the liquid suction actuator 22 to operate as follows: Figure 1 The unlocking mechanism 26 shown is pushed out of the liquid suction slot 24 and unlocked. After the liquid suction actuator 22 loses the constraint of the liquid suction slot 24, it can accelerate and slide along the liquid suction track 25 toward the loading slot under the push of the first elastic member 23.

[0066] In this application, the suction actuator 22 can be configured as a single component or a mechanism consisting of multiple fixed components. During the process of the suction actuator 22 separating from the suction slot 24 and sliding along the suction track 25, the suction needle 21 connected to it sequentially performs an upward stroke perpendicular to the suction track 25, and a sliding stroke perpendicular to the suction track 25 in conjunction with the upward stroke.

[0067] With this configuration of the suction actuator 22, the suction needle 21 may wobble due to the two rapid and vertical strokes, which may cause the suction needle 21 to contact the medicine bottle 100 at an angle, thus failing to pierce the medicine bottle 100 smoothly.

[0068] To address this issue, in a preferred embodiment of this application, the liquid suction actuator 22 may be configured to consist of at least two parts, including a liquid suction slider 221 and a liquid suction locking block 222.

[0069] The suction needle 21 is connected to the suction slider 221, which slides with the suction track 25 and abuts against the first elastic member 23. The following measures are taken: the bottom end of the suction slider 221 abuts against the substrate to restrict the lifting and lowering movement of the suction slider 221; and / or the length of the sliding engagement section between the suction slider 221 and the suction track 25 is greater than the length of the suction slot 24. The purpose is to ensure that the suction slider 221 slides only along the suction track 25 and does not fall into the suction slot 24, thereby making the movement path of the suction needle 21 straight.

[0070] The locking function of the liquid suction actuator 22 is achieved through the liquid suction locking block 222. Specifically, the liquid suction locking block 222 slides vertically with the liquid suction slider 221 through a slot provided on the liquid suction slider 221, and a through groove is provided in the middle of the liquid suction locking block 222 for the liquid suction needle 21 to pass through. The liquid suction locking block 222 is pre-positioned in the liquid suction slot 24, thereby locking the movement of the liquid suction slider 221.

[0071] When the unlocking mechanism 26, which is used to unlock the liquid suction actuator 22, is activated, the liquid suction lock block 222 is pushed out of the liquid suction slot 24, so that the liquid suction lock block 222, together with the liquid suction slider 221, slides along the liquid suction track 25.

[0072] In this application, the unlocking mechanism 26 can be configured as a strip-shaped or block-shaped part. Before or during the unlocking action, one end of the unlocking mechanism 26 abuts against the suction actuator 22 in the ready-to-act position, while the other end protrudes from the bottom of the base 1 in the normal state and can abut against the user's skin. During the unlocking action, the portion of the unlocking mechanism 26 protruding from the base 1 is subjected to pressure from the user's skin, causing the unlocking mechanism 26 to move along the length direction perpendicular to the suction track 25, thereby pushing the suction actuator 22 out of the suction slot 24 and completing the unlocking action.

[0073] With this configuration of the unlocking mechanism 26, the force exerted by the user's skin on the unlocking mechanism 26 needs to be greater than the frictional force between the liquid suction actuator 22 and the liquid suction slot 24. However, with the support of the first elastic element 23, the frictional force between the liquid suction actuator 22 and the liquid suction slot 24 is usually large, which can easily lead to difficulty in unlocking or cause discomfort to the user.

[0074] To solve this problem, such as Figures 6-7 As shown, the unlocking mechanism 26 in this application is configured to include a trigger lever 261 and an unlocking paddle 262.

[0075] The unlocking lever 262 has a toggle end 2621 corresponding to the suction slot 24, and a rotating shaft 263 hinged to the base 1 is vertically fixed at the end away from the toggle end 2621. When the rotating shaft 263 rotates, the toggle end 2621 can swing around the axis of the rotating shaft 263, thereby pushing the suction actuator 22 upward along the suction slot 24.

[0076] The rotation of the pivot 263 is powered by the unlocking lever. The other end of the pivot 263 is fixed perpendicularly to one end of the unlocking lever. The end of the unlocking lever away from the pivot 263 is designated as the pressing end 2611. Under normal conditions, the pressing end 2611 protrudes from the bottom of the base 1 and is designed to contact the user's skin. The distance between the pressing end 2611 and the pivot 263 is greater than the distance between the toggle end 2621 in the unlocking lever 262 and the pivot 263.

[0077] The purpose of this design is to transform the unlocking force of the unlocking mechanism 26 from direct pushing against the user's skin into mechanical movement based on the lever principle.

[0078] Specifically, when the product is placed on the skin, the user's skin applies a vertically upward pushing force to the protruding pressing end 2611. This pushing force drives the unlocking lever to swing around the pivot 263. Because the pressing end 2611 is far from the pivot 263, the large torque generated drives the pivot 263 to rotate. The pivot 263 then transmits this rotational motion to the unlocking lever 262. Because the actuating end 2621 of the unlocking lever 262 is close to the pivot 263, according to the lever principle, the actuating end 2621 will receive an amplified force perpendicular to the suction track 25. This amplified force is sufficient to reliably and smoothly push the suction actuator 22 away from the suction slot 24, thereby completing the unlocking.

[0079] In the above embodiments, the liquid suction slot 24 is disposed below the liquid suction track 25. However, based on the same inventive concept, the liquid suction slot 24 can also be disposed on any side of the liquid suction track 25 in a direction other than its length, and the position of the unlocking mechanism 26 can be adjusted accordingly without any creative effort.

[0080] Regarding injection device 3:

[0081] like Figure 8 and Figure 9 As shown, the injection device 3 is used to inject the liquid medicine drawn up by the aspiration device 2 into the subcutaneous tissue of the user. It includes an injection execution mechanism 32 that is connected to the injection needle 31 and is used to perform specific injection actions. The injection execution mechanism 32 is pre-configured with a needle insertion stroke and a needle return stroke, which can realize the action of inserting the injection needle 31 into the subcutaneous tissue of the user and then withdrawing it.

[0082] Among them, combined Figures 8-11As shown, the injection actuator 32 includes a first injection actuator 321 and a second injection actuator 322. In this embodiment, the first injection actuator 321 is connected to the base 1 via a second elastic element 33. The second elastic element 33 is a torsion spring and is pre-torsed so that after the torsion spring is released, it can drive the first injection actuator 321 to rotate relative to the base 1 around its own axis. The first injection actuator 321 and the second injection actuator 322 are engaged by a sliding groove 34. By configuring the second injection actuator 322 to be fixed to the injection needle 31 and to be raised and lowered relative to the base 1 in the vertical direction, the rotational movement of the first injection actuator 321 can drive the injection needle 31 to perform the lifting and lowering injection action.

[0083] Specifically, the second injection actuator 322 is inserted into a fixed rod on the base 1 and can slide along the length of the rod, so that the rotation angle of the second injection actuator 322 relative to the base 1 is fixed, retaining only the lifting movement relative to the base 1. The first injection actuator 321 is rotatably connected to the base 1 around its own axis. The first injection actuator 321 is sleeved on the outside of the second injection actuator 322 and cooperates with the second injection actuator 322 through a sliding groove 34. The second elastic member 33 is sleeved on the outer wall of the first injection actuator 321.

[0084] When the first injection actuator 321 rotates around its own axis under the action of the second elastic member 33, it cooperates with the slide groove 34 of the second injection actuator 322, and the slide groove 34 is provided with a downward section 341 and an upward section 342, so that the second injection actuator 322 can drive the injection needle 31 to perform the up-and-down needle insertion and retraction movements.

[0085] Based on this concept, in other embodiments of this application, the first injection actuator 321 can also be embedded in the inner wall of the second injection actuator 322, and the second elastic member 33 can also be disposed in the inner wall of the first injection actuator 321, so as to ensure that the second elastic member 33 can act on the first injection actuator 321 and the first injection actuator 321 and the second injection actuator 322 slide groove 34 cooperate.

[0086] In practical applications, this application needs to control the start time of the needle insertion stroke of the injection needle 31 into the subcutaneous tissue, and the start time of the needle return stroke when the needle tip remains subcutaneously to inject sufficient medication.

[0087] Therefore, a timing control mechanism 35 is provided in conjunction with the injection actuator 32. The timing control mechanism 35 is used to control the start time of the needle insertion stroke and the needle return stroke.

[0088] The timing control mechanism 35 is equipped with a controlled part 36 on the first injection actuator 321. The timing control mechanism 35 has a first control arm 351 and a second control arm 352. The first control arm 351 and the second control arm 352 alternately abut against the controlled part 36, so that the second injection actuator 322, which cooperates with the slide groove 34 of the first injection actuator 321, stops at the beginning of the needle insertion stroke and the beginning of the needle return stroke.

[0089] A control drive mechanism 37 is provided and connected to a timing control mechanism 35, which is used to drive the first control arm 351 and the second control arm 352 to alternately abut against the controlled part 36.

[0090] In a preferred embodiment of this application, the controlled part 36 is formed as a semi-annular groove around the axis of the first injection actuator 321, and the abutment end 361 is set as two inner wall surfaces of the semi-annular groove perpendicular to its own rotation direction.

[0091] Combination Figure 9 and Figure 12 As shown, the first control arm 351 and the second control arm 352 are respectively located on both sides of the first injection actuator 321 along the diameter direction, and can be extended into the inner wall of the controlled part 36 in sequence under the drive of the control drive mechanism 37, thereby being located on the movement path of the abutment end 361.

[0092] like Figures 13-16 As shown, when the contact end 361 in the controlled part 36 abuts against the first control arm 351 or the second control arm 352 at different positions, the first injection actuator 321 will be locked at two different corners by the corresponding first control arm 351 or the second control arm 352. Through the design of the slide groove 34 structure, these two different corners can be made to correspond to the start of the needle insertion stroke and the start of the needle return stroke of the second injection actuator 322.

[0093] Regarding the control drive mechanism 37, in a preferred embodiment of this application, such as Figure 9 As shown, the control drive mechanism 37 includes a control driver 371 disposed perpendicular to the base 1. A drive gear 372 is coaxially fixed to the actuating end of the control driver 371. A drive rack 373 capable of meshing with the drive gear 372 is fixed on the connecting section between the first control arm 351 and the second control arm 352. A control track is disposed on the base 1. A timing control mechanism 35 is disposed parallel to the base 1, meshes with the drive gear 372, and is slidably disposed in the control track, so that it can run along the control track and conform to the base 1 under the drive of the control driver 371.

[0094] In other embodiments of this application, the control drive mechanism 37 may also be composed of a pair of electromagnets, with the pair of electromagnets respectively corresponding to the first control arm 351 and the second control arm 352, and driving the timing control mechanism 35 to move by electromagnetic force. The control drive mechanism 37 may also be a double-stroke cylinder.

[0095] In addition, such as Figure 9 As shown, in this application, a reversing switch 38 is provided corresponding to the first control arm 351 and the second control arm 352. When the first control arm 351 or the second control arm 352 comes into contact with the corresponding reversing switch 38, the control drive mechanism 37 will stop running and be configured to run in the opposite direction to before stopping after restarting.

[0096] The application process:

[0097] The user attaches the base 1 to the skin at the injection site. The attachment action will automatically trigger the following two consecutive processes:

[0098] 1. Liquid aspiration process: combined with Figure 2 , Figure 3 and Figure 6 , Figure 7 As shown, skin pressure acts on the protruding trigger lever 261, pushing the suction actuator 22 out of the locking slot. The compressed first elastic element 23 is released, pushing the suction actuator 22 to drive the suction needle 21 to quickly and straight pierce the medicine bottle 100.

[0099] Pump 4 is started, drawing the medicine solution through the infusion tube to the injection device 3 for later use.

[0100] 2. Injection process: combined with Figure 9 , Figures 13-16 As shown, the control drive mechanism 37 starts working under program or timing control. The control drive mechanism 37 pushes the timing control mechanism 35, causing its first control arm 351 to release the injection actuator 32 while simultaneously causing the second control arm 352 to enter the controlled part 36 and be positioned on the movement path of the abutment end 361. At the same time, the first control arm 351 abuts against the corresponding reversing switch 38, causing the control drive mechanism 37 to stop moving.

[0101] During this period, the second elastic element 33 drives the first injection actuator 321 to rotate, and through the downward section 341 of the slide groove 34 structure, it is converted into the downward linear motion of the second injection actuator 322, thereby inserting the injection needle 31 into the subcutaneous tissue to perform the needle insertion stroke.

[0102] When the contact end 361 contacts the second control arm 352, the rotation of the first injection actuator 321 is locked after the corresponding injection needle 31 reaches the preset insertion depth.

[0103] Pump 4 continues to operate, injecting the medication into the subcutaneous tissue. After the injection is completed, the control drive mechanism 37 pushes the timing control mechanism 35 to move in the opposite direction, causing the second control arm 352 to disengage from the controlled part 36. The first injection actuator 321 continues to rotate under the drive of the second elastic member 33. At this time, the first injection actuator 321 will cooperate with the upper section 342 of the slide groove 34, thereby withdrawing the injection needle 31 from the subcutaneous tissue to perform the needle return stroke.

[0104] The above embodiments are merely illustrative of the technical concept and features of the present invention, intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and thus all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention.

Claims

1. A wearable drug delivery system, characterized in that, include: The base (1) is designed to fit the skin at the bottom in the application scenario; The liquid suction device (2) includes a liquid suction actuator (22) and an unlocking mechanism (26). The injection device (3) includes an injection actuator (32) and a timing control mechanism (35). The suction actuator (22) is pre-locked in the ready-to-launch position and moves toward the target position after being unlocked; the unlocking mechanism (26) abuts against the suction actuator (22) in the ready-to-launch position, and at least a part of the unlocking mechanism (26) is movably set to protrude from the bottom of the base (1) and simultaneously releases the lock of the suction actuator (22) during the fitting process of the base (1); The injection actuator (32) is pre-configured with a needle insertion stroke and a needle return stroke, and has a controlled part (36); the timing control mechanism (35) has a first control arm (351) and a second control arm (352), the first control arm (351) and the second control arm (352) alternately abut against the controlled part (36), respectively corresponding to the start of the needle insertion stroke and the start of the needle return stroke; The suction actuator (22) is provided on the base (1) with a suction track (25) and a suction slot (24) communicating with the suction track (25) is provided perpendicular to the running direction of the suction track (25). The suction actuator (22) slides along the suction track (25) toward the target position or is engaged in the suction slot (24).

2. The wearable drug delivery system according to claim 1, characterized in that: A first elastic element (23) is provided in the liquid suction device (2), and the first elastic element (23) drives the liquid suction actuator (22) to move toward the target position or has a tendency to move toward the target position; A second elastic element (33) is provided in the injection device (3), the second elastic element (33) being used to drive the injection actuator (32) to perform the needle insertion stroke and the needle return stroke; and The control drive mechanism (37) is connected to the timing control mechanism (35) and is used to drive the first control arm (351) and the second control arm (352) to alternately abut against the controlled part (36).

3. The wearable drug delivery system according to claim 2, characterized in that, The injection actuator (32) includes a first injection actuator (321) and a second injection actuator (322); One end of the second elastic element (33) is connected to the base (1), and the other end is connected to the first injection actuator (321), which can drive the first injection actuator (321) to rotate around its own axis; the controlled part (36) is disposed on the first injection actuator (321); The second injection actuator (322) is perpendicular to the plane of the base (1) and is slidably connected to the base (1), and has a fixed angle relative to the base (1). The second injection actuator (322) cooperates with the groove (34) of the first injection actuator (321).

4. The wearable drug delivery system according to claim 3, characterized in that, The controlled part (36) is opened around the axis of the first injection actuator (321) and has two abutting ends (361) perpendicular to its own movement direction. The abutting ends (361) abut against the first control arm (351) or the second control arm (352) as the first injection actuator (321) rotates relative to the base (1), so that the injection actuator (32) is locked at the starting point of the needle insertion stroke or the starting point of the needle return stroke.

5. A wearable drug delivery system according to claim 4, characterized in that, The control drive mechanism (37) includes a control driver (371) and a control track fixed on the base (1). The control driver (371) has a drive gear (372) coaxially fixed at the execution end. A drive rack (373) is provided on the timing control mechanism (35) corresponding to the drive gear (372). The drive gear (372) meshes with the drive rack (373), so that the timing control mechanism (35) slides along the control track.

6. A wearable drug delivery system according to claim 5, characterized in that, The unlocking mechanism (26) includes a trigger lever (261) and an unlocking paddle (262). One end of the trigger rod (261) is hinged to the base (1), and the other end protrudes from the bottom of the base (1); The unlocking paddle (262) is set in the liquid suction slot (24). One end is directly or through a transmission connection to the hinge end of the unlocking lever, and the other end abuts against the liquid suction actuator in the ready position. Under the drive of the trigger lever (261), an unlocking thrust is applied to the liquid suction actuator.

7. A wearable drug delivery system according to claim 6, characterized in that, The liquid suction actuator (22) includes a liquid suction slider (221) and a liquid suction lock block (222). The liquid suction slider (221) is configured to remain slidably connected to the liquid suction track (25), and one end away from the target position abuts against the first elastic member (23); The liquid-absorbing locking block (222) is pre-configured to engage with the liquid-absorbing slot (24). The liquid-absorbing locking block (222) is slidably engaged with the liquid-absorbing slider (221) and slides relative to the liquid-absorbing slider (221) in a length direction perpendicular to the liquid-absorbing track (25) under the action of the unlocking paddle (262).

8. The wearable drug delivery system according to claim 7, characterized in that, The device includes a needle assembly, which includes an infusion tube with an aspiration needle (21) and an injection needle (31) fixed at both ends of the infusion tube, respectively. The aspiration needle (21) is connected to an aspiration actuator (22), and the injection needle (31) is connected to an injection actuator (32).

9. A wearable drug delivery system according to claim 8, characterized in that, A pump (4) is installed on the base (1), which is used to drive the liquid in the delivery tube to flow in the direction of the injection needle (31).

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