Automatic injection device

Abstract

The invention provides an automatic injection device which comprises a needle bin system, a needle head system, a needle head system, a needle head system, a needle head system, a needle head system and a needle head system, the driving system is detachably connected with the needle bin system, the driving system is provided with a first-stage driving mechanism and a second-stage driving mechanism, the first-stage driving mechanism is used for driving an injection needle of the pre-filling injector to pierce an injection part, and the second-stage driving mechanism is used for driving an injection push rod of the pre-filling injector to move; and the liquid medicine is injected into the injection part through the injection needle. The automatic injection device can be repeatedly used, more importantly, the automatic injection device is further provided with the first-stage driving mechanism and the second-stage driving mechanism, the first-stage driving mechanism is used for puncturing the injection needle on the pre-filling injector into the body by a certain depth, and then the second-stage driving mechanism drives the injection push rod of the pre-filling injector to move; all the liquid medicine is injected into the injection part, time sequence control is achieved, and therefore the liquid medicine injection effect can be ensured.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more particularly to an automated injection device. Background Technology

[0002] The management of chronic diseases consumes a significant amount of medical resources. Therefore, society has placed higher demands on self-administered injection devices for patients, expecting them to be as simple to operate as possible without requiring special training.

[0003] However, traditional injection devices typically require skilled users to master the needle insertion angle, depth, and manual injection techniques, which can lead to variations in drug delivery effectiveness depending on the user's level of expertise. Furthermore, traditional automated injection devices are usually disposable, increasing drug costs and adding to the burden on patients. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide an automated injection device that is reusable, reduces the burden on patients, and improves injection effectiveness.

[0005] To address the aforementioned technical problems, in a first aspect, this application provides an automatic injection device, comprising: The needle cartridge system has mounting holes for mounting pre-filled syringes; The drive system is detachably connected to the needle cartridge system. The drive system has a primary drive mechanism and a secondary drive mechanism. The primary drive mechanism is used to drive the injection needle of the pre-filled syringe to pierce the injection site. The secondary drive mechanism is used to drive the injection plunger of the pre-filled syringe to move so as to inject the drug solution into the injection site through the injection needle. In some embodiments of this application, the drive system includes a housing, an insertion sleeve, and a first elastic element; The outer shell is detachably connected to the needle cartridge system, and the inner sidewall of the outer shell has a first abutting protrusion ring; The needle insertion sleeve is movably inserted into the outer shell, and the outer side wall of the needle insertion sleeve is provided with a first limiting protrusion ring; The first elastic element is sleeved on the needle insertion sleeve and located between the first abutting protrusion and the first limiting protrusion, and is used to apply a force toward the injection site to the needle insertion sleeve; The first abutting protrusion, the first limiting protrusion, and the first elastic element cooperate to form the primary driving mechanism.

[0006] In some embodiments of this application, the proximal end of the needle insertion sleeve has a gap with the flange edge of the pre-filled syringe; During the insertion phase, the first elastic element drives the needle sleeve to move toward the flange edge, and an impact sound is generated when the proximal end of the needle sleeve contacts the flange edge.

[0007] In some embodiments of this application, a first limiting structure is provided inside the outer casing; The distal end of the needle insertion sleeve is provided with a plurality of first locking structures, which cooperate with the first limiting structure to compress the first elastic element. When the drive system is activated to separate the first locking structure from the first limiting structure, the first elastic element drives the needle sleeve to move toward the flange edge.

[0008] In some embodiments of this application, the drive system further includes a drive rod and a second elastic element; The drive rod is movably disposed inside the needle insertion sleeve, and the outer side wall of the drive rod has a second limiting protrusion ring; The outer casing is also provided with a second abutting protrusion; The second elastic element is sleeved on the drive rod and is located between the second limiting protrusion and the second abutting protrusion. The second elastic element is used to apply a force toward the injection push rod to the drive rod. The second abutting protrusion, the second limiting protrusion, and the second elastic element cooperate to form the secondary drive mechanism.

[0009] In some embodiments of this application, the outer casing is further provided with a plurality of second locking structures, portions of which are located inside the needle insertion sleeve and abut against the inner sidewall of the needle insertion sleeve; The distal end of the drive rod has a second limiting structure, which cooperates with the second locking structure to lock the second elastic element in a compressed state. When the first elastic element drives the needle insertion sleeve to move toward the flange edge until a portion of the second locking structure is exposed from inside the needle insertion sleeve, the injection stage begins. At this time, several of the second locking structures open to unlock the second limiting structure, and the second elastic element releases elastic force to drive the drive rod to push the injection push rod to move.

[0010] In some embodiments of this application, the needle cartridge system includes a cartridge shell, a needle cartridge sleeve, a limiting cam sleeve, and a buffer elastic element; The chamber shell and the outer shell are detachably connected; The limiting cam sleeve is disposed inside the housing; The needle chamber sleeve is located inside the chamber shell and passes through the limiting cam sleeve. The distal end face of the needle chamber sleeve is used to abut against the flange edge of the pre-filled syringe. The mounting hole is opened in the needle chamber sleeve. The buffer elastic element is sleeved on the needle magazine sleeve and is located at the protrusion at the far end of the limiting cam sleeve and the needle magazine sleeve.

[0011] In some embodiments of this application, the needle cartridge system further includes a depth adjustment ring rotatably disposed on the cartridge housing; The depth adjustment ring is connected to the limiting cam sleeve, and the limiting cam sleeve has a first cam cantilever. The distal outer periphery of the needle magazine sleeve is fixedly provided with a second cam cantilever corresponding to the first cam cantilever; When the depth adjustment ring is rotated, the distance between the first cam cantilever and the second cam cantilever can be adjusted.

[0012] In some embodiments of this application, the needle cartridge system further includes a depth adjustment ring rotatably disposed on the cartridge housing; A first cam cantilever is fixedly installed inside the chamber shell; The needle cartridge sleeve is provided with a second cam cantilever, which is located near the far end of the cartridge housing; The depth adjustment ring is connected to the needle cartridge sleeve; When the depth adjustment ring is rotated, the distance between the first cam cantilever and the second cam cantilever can be adjusted.

[0013] In some embodiments of this application, the needle cartridge system further includes a reset elastic element and a reset sleeve movably disposed near the proximal end of the cartridge housing; The inner wall of the chamber shell is provided with a slot along its axial direction; The outer wall of the reset sleeve is provided with a retaining rib corresponding to the limiting groove. The retaining rib is movably located in the retaining groove. The reset sleeve is used to cover the injection needle. The reset elastic element is sleeved on the reset sleeve and is used to apply force to the reset sleeve, causing the reset sleeve, which has retracted into the housing, to extend.

[0014] In some embodiments of this application, the drive system further includes buttons and a lock key; The button is movably located at the far end of the housing, and the inner sidewall of the button is provided with an elastic cantilever, which is connected to the locking key. A locking groove is provided at the distal end of the housing, the locking groove being used to accommodate the elastic cantilever, so as to lock the button and the housing; When unlocking, the elastic cantilever moves from the locking slot into the housing by pressing the locking key.

[0015] In some embodiments of this application, the button has a start key inside, and the proximal dimension of the start key is larger than the area space enclosed by a plurality of first locking structures; When the button is pressed, the start button is inserted into the area space to separate the first locking structure from the first limiting structure.

[0016] In some embodiments of this application, the drive system further includes a button spring; The button also has a connecting post inside; The button spring is sleeved on the connecting post and is used to apply force to the button; When the pressure on the button is released, the button spring causes the button to reset.

[0017] In some embodiments of this application, the drive system further includes a button, a button spring, a locking key, and a locking spring; The button is movably located at the far end of the housing, and the button has a connecting post inside; The button spring is sleeved on the connecting post and is used to drive the button to reset; The locking key is movably disposed in the housing, and the locking key has a baffle located inside the housing, the baffle having a channel; The locking spring is sleeved on the middle part of the locking key and is used to drive the locking key to reset. When unlocking, the locking key is pressed to align the channel with the connecting post, allowing the connecting post to pass through the channel.

[0018] In some embodiments of this application, the automated injection device further includes a reset remover; One end of the reset remover has a hooked claw, and the other end has a convex shaft; Prior to the insertion phase, the hooked claw is inserted into the needle chamber system to remove the needle cap of the pre-filled syringe; After the injection is completed, the convex shaft abuts against the drive rod and extends into the drive system to reset the primary drive mechanism and the secondary drive mechanism.

[0019] In some embodiments of this application, the outer side wall of the drive rod is provided with a limiting protrusion along its axial direction, and the inner side wall of the needle insertion sleeve is provided with a limiting recess along its axial direction, wherein the limiting protrusion and the limiting recess are slidably engaged.

[0020] In some embodiments of this application, an observation window is provided on the side wall of the casing, the observation window being used to reveal the piston position of the pre-filled syringe.

[0021] The advantages of the automatic injection device provided in this application are as follows: 1. The drive system in this application has a primary drive mechanism and a secondary drive mechanism. The primary drive mechanism is used to insert the injection needle on the pre-filled syringe into the body to a certain depth. Then, the secondary drive mechanism drives the injection plunger of the pre-filled syringe to move, so as to inject all the drug solution into the injection site. This application achieves timing control through the cooperation between the internal mechanical structures of the device, which can ensure the effectiveness of drug injection.

[0022] 2. The automatic injection device provided in this application can be reused. Each time it is used, only the pre-filled syringe needs to be replaced, which can reduce the economic burden on patients and avoid medical risks such as infection caused by the reuse of syringes.

[0023] 3. The automatic injection device provided in this application can adjust the needle insertion depth by rotating the depth adjustment ring to adapt to patients of different weights, thereby increasing applicability and ensuring the injection effect.

[0024] 4. The automatic injection device provided in this application can use a reset remover to remove the needle cap of the pre-filled syringe inside the device, reducing the risk of needle prick for the user.

[0025] 5. During the use of the automatic injection device provided in this application, the pre-filled injection needle is completely covered to avoid causing panic in patients who see the needle.

[0026] 6. During use, the automatic injection device provided in this application can alert the user that the injection has started by the impact sound generated when the proximal end of the needle sleeve contacts the flange edge. Furthermore, the position of the piston of the pre-filled syringe can be observed through the observation window, allowing the patient to monitor the entire injection process. Attached Figure Description

[0027] Figure 1 An angular view of the automatic injection device provided in this application; Figure 2 Exploded view of the automatic injection device provided in this application; Figure 3 A front view and a sectional view along the axial direction of a pre-filled syringe provided in this application; Figure 4 A front view and a cross-sectional view along line AA of the automatic injection device provided in this application; Figure 5 A cross-sectional view of the automatic injection device provided in this application at a first angle along its axial direction; Figure 6 A cross-sectional view of the automatic injection device provided in this application at a second angle along its axial direction; Figure 7 for Figure 6 A magnified view of the area near the button; Figure 8 for Figure 6 A close-up view of the button when it is locked; Figure 9a This is a schematic diagram of the button structure; Figure 9b A schematic diagram illustrating the use of a button and a lock key in another embodiment provided in this application; Figure 10 A front view and a cross-sectional view along the axial direction of the needle cartridge system provided in this application; Figure 11 The embodiments provided in this application include a perspective view and a front view of the assembled needle cartridge sleeve, limiting cam sleeve, depth adjustment ring, and pre-filled syringe; Figure 12 A partial schematic diagram of the interior of a needle cartridge system according to another embodiment provided in this application; Figure 13 The embodiments provided in this application include a front view and a cross-sectional view along its axial direction when the needle cap is removed by the reset remover; Figure 14 The embodiments provided in this application show a front view and a cross-sectional view of the drive system after injection is completed. Figure 15 The embodiments provided in this application include a front view and a cross-sectional view along the axial direction of the drive system when a reset remover is used to reset the drive system. Figure 16 The embodiments provided in this application show a front view and a cross-sectional view along its axial direction of the drive system after reset.

[0028] Figure label: Drive system 1, housing 101, locking groove 1011, cantilever groove 1012, first limiting structure 1013, second locking structure 1014, first abutting protrusion ring 1015, second abutting protrusion ring 1016, button 102, connecting post 1021, start button 1022, locking button 103, elastic cantilever 1031, baffle 1032, channel 1033, button spring 104, first elastic element 105, needle sleeve 106, first locking structure 1061, V-shaped area space 1062, inner hole wall 1063, first limiting protrusion ring 1064, second elastic element 107, drive rod 108, second limiting structure 1081, second limiting protrusion ring 108 2. Locking spring 109, needle chamber system 2, chamber shell 201, depth adjustment ring 202, observation window 203, reset sleeve 204, threaded connection structure 205, needle depth indicator 206, reset elastic element 207, mounting hole 208, needle chamber sleeve 209, second cam cantilever 2091, buffer elastic element 211, limit cam sleeve 212, first cam cantilever 2121, hollow ring 2122, retaining rib 213, pre-filled syringe 3, needle shell 300, flange edge 3001, push rod 301, piston 302, medicine liquid 303, needle cap 304, injection needle 305, reset remover 4, hook claw 401, convex shaft 402, abutment end face 403. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this application pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but does not exclude other elements or objects. Unless otherwise specified, the term "connection" as used herein can refer to a direct connection or an indirect connection, i.e., a connection through an intermediate object.

[0030] Furthermore, it should be understood that the orientations or positional relationships indicated by terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" in this document are based on the orientations or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation on this application. The terms "first" and "second" in this document are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0031] Note: In this article, the term "proximal" refers to the end closer to the injection site and further away from the button; the term "distal" refers to the end closer to the button and further away from the injection site.

[0032] To address the problems existing in the prior art, embodiments of this application provide an automated injection device, with reference to... Figures 1 to 3 As shown, the automatic injection device includes a drive system 1 and a needle cartridge system 2. The needle cartridge system 2 has a mounting hole 208 along its axial direction for mounting a pre-filled syringe 3. The drive system 1 is detachably connected to the needle cartridge system 2, thereby enabling the installation or replacement of the pre-filled syringe 3. The drive system 1 has a primary drive mechanism and a secondary drive mechanism. The primary drive mechanism drives the injection needle 305 of the pre-filled syringe 3 to pierce the injection site, and the secondary drive mechanism drives the injection push rod 301 of the pre-filled syringe 3 to move, so as to inject the drug solution 303 into the injection site through the injection needle 305.

[0033] In this embodiment, the drive system 1 achieves timing control through the cooperation of its internal mechanical structures. Specifically, after the primary drive mechanism inserts the injection needle 305 of the pre-filled syringe 3 into the body to a certain depth, the secondary drive mechanism then drives the injection plunger 301 of the pre-filled syringe 3 to move, so as to inject all the drug solution 303 into the injection site. This timing control prevents the drug solution 303 from flowing out prematurely, ensuring that all of the drug solution 303 is injected into the body and guaranteeing the effectiveness of the drug injection.

[0034] In addition, the automatic injection device in this embodiment can be reused. Each time it is used, only the pre-filled syringe 3 needs to be replaced, which can reduce the economic burden on patients and avoid medical risks such as infection caused by reuse.

[0035] refer to Figure 4 and Figure 5As shown, in some embodiments, the drive system 1 includes a housing 101, a needle insertion sleeve 106, and a first elastic element 105. The housing 101 has a hollow cylindrical structure and is detachably connected to the needle cartridge system 2. The inner sidewall of the housing 101 has a first abutting protrusion 1015, which is located near the distal end of the housing 101. The needle insertion sleeve 106 is movably inserted into the housing 101, and the outer sidewall of the needle insertion sleeve 106 has a first limiting protrusion 1064. The first elastic element 105 is sleeved on the needle insertion sleeve 106 and located between the first abutting protrusion 1015 and the first limiting protrusion 1064, and is used to apply a force toward the injection site to the needle insertion sleeve 106.

[0036] The first abutting protrusion 1015, the first limiting protrusion 1064, and the first elastic element 105 cooperate to form a primary drive mechanism.

[0037] In this embodiment, the first elastic element 105 is a spring. It is understood that when the automatic injection device is not activated, the first elastic element 105 is compressed between the first abutting protrusion 1015 and the first limiting protrusion 1064. When the automatic injection device is activated, the first elastic element 105 can release its elastic force, thereby pushing the needle insertion sleeve 106 to move axially within the housing 101, which in turn drives the injection needle 305 of the pre-filled syringe 3 to pierce the injection site.

[0038] Continue to refer to Figure 4 and Figure 5 As shown, in some embodiments, after the pre-filled syringe 3 is installed in the needle chamber system 2, the proximal end of the needle insertion sleeve 106 has a gap with the flange edge 3001 of the pre-filled syringe 3. After the automatic injection device is started, it enters the insertion stage. The first elastic element 105 drives the needle insertion sleeve 106 to move toward the flange edge 3001. When the proximal end of the needle insertion sleeve 106 contacts the flange edge 3001, an impact sound is generated.

[0039] In this implementation, the patient can determine the start of the injection by the impact sound, which serves as a reminder to the patient.

[0040] refer to Figure 5 As shown, in some embodiments, the outer casing 101 is provided with a cantilever groove 1012 and a first limiting structure 1013, the first limiting structure 1013 being a V-shaped structure. The distal end of the needle insertion sleeve 106 is provided with a plurality of first locking structures 1061. Before the automatic injection device is started, the plurality of first locking structures 1061 pass through the cantilever groove 1012 and cooperate with the first limiting structure 1013 to compress the first elastic member 105.

[0041] When the automatic injection device is activated and enters the insertion stage, the drive system 1 drives the first locking structure 1061 to separate from the first limiting structure 1013. At this time, the first elastic element 105 releases its elastic force to drive the needle insertion sleeve 106 to move toward the flange edge 3001. The proximal end of the needle insertion sleeve 106 abuts against the flange edge 3001 and makes an impact sound. Then it continues to push the flange edge 3001 until the injection needle 305 is completely inserted into the patient's body.

[0042] In this embodiment, the first limiting structure 1013 is a tapered limiting rib disposed inside the housing 101. The first locking structure 1061 is a hooked cantilever, and the limiting rib is used to support the hook portion of the hooked cantilever so that the first elastic member 105 is in a compressed state.

[0043] refer to Figure 4 and Figure 6 As shown, in some embodiments, the drive system 1 further includes a drive rod 108 and a second elastic element 107. The drive rod 108 is a long rod structure that movably passes through the needle insertion sleeve 106, and its outer side wall has a second limiting protrusion 1082. A second abutting protrusion 1016 is also provided inside the housing 101. The second elastic element 107 is sleeved on the drive rod 108 and located between the second limiting protrusion 1082 and the second abutting protrusion 1016. The second elastic element 107 applies a force to the drive rod 108 toward the injection pusher 301.

[0044] The second abutting protrusion 1016, the second limiting protrusion 1082, and the second elastic member 107 cooperate to form a two-stage driving mechanism.

[0045] In this embodiment, the second elastic element 107 is also a spring. Before the injection needle 305 pierces the injection site, the second elastic element 107 is in a compressed state. After the injection needle 305 pierces the injection site, the secondary drive mechanism is activated to drive the injection plunger 301 of the pre-filled syringe 3 to move, thereby injecting the drug solution 303 into the injection site through the injection needle 305.

[0046] Specifically, refer to Figure 6 and Figure 7 As shown, the outer casing 101 also includes a plurality of second locking structures 1014. Parts of the second locking structures 1014 are located within the needle insertion sleeve 106, and these parts abut against the inner wall 1063 of the needle insertion sleeve 106, forming a slot structure. The distal end of the drive rod 108 has a second limiting structure 1081, which is located within the slot structure and engages with the second locking structures 1014 to lock the second elastic member 107 in a compressed state.

[0047] When the first elastic element 105 drives the needle insertion sleeve 106 to move toward the flange edge 3001 until a portion of the second locking structure 1014 is exposed from the inner bore wall 1063, the injection stage begins. At this point, several of the second locking structures 1014, no longer restrained by the inner bore wall 1063, will move along... Figure 7 The middle arrow points in the direction of the opening to unlock the second limiting structure 1081. The second elastic element 107 releases elastic force to drive the drive rod 108 to push the injection push rod 301 to move until the injection of the drug liquid 303 is completed.

[0048] In this embodiment, the second locking structure 1014 is a barbed cantilever, and the second limiting structure 1081 is a cone. The hook of the barbed cantilever is used to hook the protruding part of the cone, thereby compressing the second elastic member 107.

[0049] refer to Figure 4 , Figure 8 and Figure 9a As shown, in some embodiments, the drive system 1 further includes a button 102 and a locking key 103. The button 102 is movably disposed at the distal end of the housing 101. An elastic cantilever 1031 is provided on the inner sidewall of the button 102, and the elastic cantilever 1031 is connected to the locking key 103 located on the outer side, with a gap between the elastic cantilever 1031 and the locking key 103. A locking groove 1011 is formed at the distal end of the housing 101, which accommodates the elastic cantilever 1031 and can block the elastic cantilever 1031, thereby locking the button 102 and the housing 101.

[0050] When unlocking, pressing the locking key 103 causes the elastic cantilever 1031 to move from the locking groove 1011 toward the inside of the outer shell 101 until the gap between the elastic cantilever 1031 and the locking key 103 corresponds to the locking groove 1011. At this time, pressing the button 102 will open several first locking structures 1061, so that the first locking structures 1061 are separated from the first limiting structure 1013, thereby realizing the first elastic element 105 driving the needle insertion sleeve 106 to move toward the flange edge 3001.

[0051] Specifically, in combination Figure 5 As shown, the button 102 has a start key 1022 inside. The start key 1022 has a V-shaped structure, and the size of the proximal end of the start key 1022 is larger than the V-shaped area space 1062 enclosed by several first locking structures 1061.

[0052] Therefore, when button 102 is pressed, the start button 1022 is inserted into the V-shaped area space 1062, and several first locking structures 1061 will open, thereby separating from the first limiting structure 1013.

[0053] Furthermore, the drive system 1 also includes a button spring 104, which is sleeved on the connecting post 1021 provided inside the button 102, and the proximal end of the button spring 104 abuts against the inside of the housing 101 to apply force to the button 102.

[0054] Therefore, when button 102 is pressed, button spring 104 will contract and store force. When the pressure on button 102 is released, button spring 104 will release elastic force to drive button 102 to reset.

[0055] refer to Figure 9b As shown, in some embodiments, the drive system 1 further includes a button 102, a button spring 104, a locking key 103, and a locking spring 109. The button 102 is movably disposed at the distal end of the housing 101, and has a connecting post 1021 and a start button 1022 inside. The button spring 104 is sleeved on the connecting post 1021 to reset the button 102. The locking key 103 is movably disposed in the housing 101 and has a baffle 1032 located inside the housing 101. The baffle 1032 has a channel 1033, and in the locked state, the baffle 1032 blocks the proximal end of the connecting post 1021. The locking spring is sleeved on the middle portion of the locking key 103, with one end abutting against the housing 101, to reset the locking key 103.

[0056] In this embodiment, when unlocking is required, pressing the locking button 103 aligns the channel 1033 with the connecting post 1021. Pressing the button 102 then allows the connecting post 1021 to pass through the channel 1033, thereby moving the activation button 1022 proximally to open several first locking structures 1061. It should be noted that this embodiment provides a split-type activation button, a design that facilitates use by patients with limited hand dexterity.

[0057] It is understandable that the purpose of the locking button 103 in this application is to prevent children or non-patients from accidentally touching the start button 102, causing the product to be accidentally activated, so as to improve the safety of the product during handling.

[0058] refer to Figure 2 , Figure 10 and Figure 11As shown, in some embodiments, the needle cartridge system 2 includes a cartridge shell 201, a needle cartridge sleeve 209, a limiting cam sleeve 212, and a buffer elastic element 211. The cartridge shell 201 is detachably connected to the outer shell 101. Specifically, the distal end of the cartridge shell 201 has a threaded connection structure 205, thus enabling a detachable connection between the cartridge shell 201 and the outer shell 101 via a threaded connection. The limiting cam sleeve 212 is disposed within the cartridge shell 201, and the needle cartridge sleeve 209 is located within the cartridge shell 201 and passes through the limiting cam sleeve 212. The distal end face of the needle cartridge sleeve 209 is used to abut against the flange edge 3001 of the pre-filled syringe 3, and a mounting hole 208 is formed in the needle cartridge sleeve 209. The buffer elastic element 211 is sleeved on the needle cartridge sleeve 209 and is located between the hollow ring 2122 at the distal end of the limiting cam sleeve 212 and the protrusion at the distal end of the needle cartridge sleeve 209.

[0059] In this embodiment, when the primary drive mechanism pushes the pre-filled syringe 3 to move, the buffer elastic element 211 acts as a damping buffer, making the needle insertion into the patient's body more stable and reliable.

[0060] In some embodiments, an observation window 203 is provided on the side wall of the housing 201, which is used to expose the position of the piston 302 of the pre-filled syringe 3.

[0061] In this embodiment, the patient can observe the position of the piston 302 of the pre-filled syringe 3 through the observation window 203, so that the patient can intuitively understand whether the drug has been completely injected into the body.

[0062] refer to Figure 10 and Figure 11 As shown, in some embodiments, the needle cartridge system 2 further includes a depth adjustment ring 202 rotatably disposed on the cartridge housing 201. The depth adjustment ring 202 is connected to a limiting cam sleeve 212, which has a first cam cantilever 2121. The first cam cantilever 2121 is located near the proximal end of the needle cartridge sleeve 209, and a second cam cantilever 2091 is fixedly disposed on the outer periphery of the distal end of the needle cartridge sleeve 209 corresponding to the first cam cantilever 2121. The first cam cantilever 2121 and the second cam cantilever 2091 cooperate to limit the movement distance of the pre-filled syringe 3.

[0063] When the depth adjustment ring 202 is rotated, the distance h between the first cam cantilever 2121 and the second cam cantilever 2091 can be adjusted, thereby adjusting the needle insertion depth to suit patients of different weights, increasing applicability and ensuring the injection effect.

[0064] In this embodiment, the depth adjustment ring 202 is rotatably sleeved on the outer wall of the housing 201. The outer wall of the housing 201 is also provided with a needle depth indicator 206. The depth adjustment ring 202 is engaged with the limiting cam sleeve 212, and the depth adjustment ring 202 has an indicator. When the depth adjustment ring 202 rotates, it can drive the limiting cam sleeve 212 to rotate together. At this time, the distance h between the second cam cantilever 2091 and the first cam cantilever 2121 will change, and the adjusted distance h can be accurately obtained through the needle depth indicator 206 indicated by the indicator.

[0065] refer to Figure 12 As shown, in some embodiments, a first cam cantilever 2121 may be fixedly disposed near the housing 201. At the distal end near the housing 201, a second cam cantilever 2091 is disposed on the needle cartridge sleeve 209. The second cam cantilever 2091 can rotate with the needle cartridge sleeve 209 and can move along its axis. A depth adjustment ring 202 is rotatably sleeved on the outer wall of the housing 201 and connected to the needle cartridge sleeve 209. Rotating the depth adjustment ring 202 can also adjust the distance h between the first cam cantilever 2121 and the second cam cantilever 2091. It should be noted that the second cam cantilever 2091 and the needle cartridge sleeve 209 can be integrally formed, and the housing 201 and the first cam cantilever 2121 can also be integrally formed.

[0066] refer to Figure 10 As shown, in some embodiments, the needle cartridge system 2 further includes a reset elastic element 207 and a reset sleeve 204 movably disposed near the proximal end of the cartridge housing 201. Specifically, the inner sidewall of the cartridge housing 201 has a groove along its axial direction, and the outer sidewall of the reset sleeve 204 has a retaining rib 213 corresponding to the limiting groove. The retaining rib 213 is movably located within the groove to prevent the reset sleeve 204 from rotating during movement. The reset sleeve 204 is used to block the injection needle 305. The reset elastic element 207 is sleeved on the reset sleeve 204 and is used to apply force to the reset sleeve 204, which can extend the reset sleeve 204 that has retracted into the cartridge housing 201.

[0067] In this embodiment, the automatic injection device is brought close to the patient so that the proximal end of the reset sleeve 204 is pressed against the skin at the injection site. When the automatic injection device is pressed down, the reset sleeve 204 retracts into the needle chamber system 2, causing the reset spring to be compressed. At this time, since the locking key 103 and button 102 are not pressed, the needle insertion sleeve 106 and drive rod 108 are engaged with the corresponding structure inside the outer shell 101, remaining relatively stationary with respect to the outer shell 101. The first elastic element 105 and the second elastic element 107 are still in a compressed state, so the pre-filled syringe 3 will not move, and the injection needle 305 remains inside the chamber 201 and has not pierced the patient's body. If the patient feels that the injection site is not suitable for injection, the automatic injection device can be moved away from the previous injection site, the reset spring force is released, and the reset sleeve 204 will extend out of the chamber 201 again, avoiding the leakage of the injection needle 305. This also avoids the possibility of the injection needle 305 contacting the patient's skin during the injection site selection process, reducing the risk of accidental injury during use. Furthermore, because the 305 injection needle is completely covered throughout the procedure, it reduces the panic experienced by patients upon seeing the needle, resulting in a better user experience.

[0068] refer to Figure 13 As shown, in some embodiments, the automatic injection device further includes a reset remover 4, one end of which has a hooked claw 401 and the other end has a convex shaft 402.

[0069] It should be noted that the pre-filled syringe 3 has a needle cap 304, which is retained when the pre-filled syringe 3 is installed in the mounting hole 208. Therefore, before the injection needle 305 inserts, the hooked claw 401 needs to be inserted into the needle chamber system 2 to remove the needle cap 304 of the pre-filled syringe 3. After injection, the reset remover 4 abuts against the drive rod 108 and the needle insertion sleeve 106 to reset the primary and secondary drive mechanisms.

[0070] In this embodiment, after injection, the drive system 1 and the needle chamber system 2 are separated, and then the pre-filled syringe 3 that has been used is removed from the needle chamber system 2. At this time, the needle insertion sleeve 106 and the drive rod 108 in the drive system 1 are in the extended state, as shown... Figure 14 Then, the convex shaft 402 and the abutment end face 403 of the reset remover 4 are used to push the needle insertion sleeve 106 and the drive rod 108 back to the injection position.

[0071] Specifically, refer to Figure 15As shown, during the reset process, firstly, the convex shaft 402 of the reset remover 4 is aligned with the proximal end face of the drive rod 108, and force is applied to the proximal end face of the drive rod 108 to retract the drive rod 108. At this time, the second elastic element 107 is compressed and stores force. Then, the reset remover 4 is pushed to move, and the abutting end face 403 of the reset remover 4 contacts the proximal end face of the needle insertion sleeve 106, causing the needle insertion sleeve 106 to retract inward, so that the first elastic element 105 is compressed. Until the relevant structures of the needle insertion sleeve 106 and the drive rod 108 are engaged with the corresponding mating structures inside the housing 101, the drive system 1 is reset. The interior of the drive system 1 is as follows: Figure 16 As shown.

[0072] In some embodiments, the outer side wall of the drive rod 108 is provided with a limiting protrusion along its axial direction, and the inner side wall of the needle insertion sleeve 106 is provided with a limiting recess along its axial direction, with the limiting protrusion and the limiting recess slidingly engaged.

[0073] In this embodiment, the sliding engagement between the limiting protrusion and the limiting recess ensures that the drive rod 108 does not rotate when moving axially, thereby guaranteeing the stability of the drive rod 108 during movement.

[0074] In some embodiments, since some pre-filled syringes 3 loaded with drugs do not contain a push rod 301 when they leave the factory, in order to solve this problem, this application provides an extension rod of a certain length at the proximal end of the drive rod 108. The extension rod can be inserted into the needle shell 300 of the pre-filled syringe 3 and abut against the piston 302.

[0075] The above are merely specific embodiments of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the scope of the claims.

Claims

1. An automatic injection device, characterized in that, include: The needle cartridge system has mounting holes for mounting pre-filled syringes; The drive system is detachably connected to the needle cartridge system. The drive system has a primary drive mechanism and a secondary drive mechanism. The primary drive mechanism is used to drive the injection needle of the pre-filled syringe to pierce the injection site. The secondary drive mechanism is used to drive the injection plunger of the pre-filled syringe to move so as to inject the drug solution into the injection site through the injection needle.

2. The automatic injection device according to claim 1, characterized in that, The drive system includes a housing, a needle insertion sleeve, and a first elastic element; The outer shell is detachably connected to the needle cartridge system, and the inner sidewall of the outer shell has a first abutting protrusion ring; The needle insertion sleeve is movably inserted into the outer shell, and the outer side wall of the needle insertion sleeve is provided with a first limiting protrusion ring; The first elastic element is sleeved on the needle insertion sleeve and located between the first abutting protrusion and the first limiting protrusion, and is used to apply a force toward the injection site to the needle insertion sleeve; The first abutting protrusion, the first limiting protrusion, and the first elastic element cooperate to form the primary driving mechanism.

3. The automatic injection device according to claim 2, characterized in that, The proximal end of the needle insertion sleeve has a gap with the flange edge of the pre-filled syringe; During the insertion phase, the first elastic element drives the needle sleeve to move toward the flange edge, and an impact sound is generated when the proximal end of the needle sleeve contacts the flange edge.

4. The automatic injection device according to claim 2, characterized in that, The outer shell is provided with a first limiting structure; The distal end of the needle insertion sleeve is provided with a plurality of first locking structures, which cooperate with the first limiting structure to compress the first elastic element. When the drive system is activated to separate the first locking structure from the first limiting structure, the first elastic element drives the needle sleeve to move toward the flange edge.

5. The automatic injection device according to claim 2, characterized in that, The drive system also includes a drive rod and a second elastic element; The drive rod is movably disposed inside the needle insertion sleeve, and the outer side wall of the drive rod has a second limiting protrusion ring; The outer casing is also provided with a second abutting protrusion; The second elastic element is sleeved on the drive rod and is located between the second limiting protrusion and the second abutting protrusion. The second elastic element is used to apply a force toward the injection push rod to the drive rod. The second abutting protrusion, the second limiting protrusion, and the second elastic element cooperate to form the secondary drive mechanism.

6. The automatic injection device according to claim 5, characterized in that, The outer casing is also provided with a plurality of second locking structures, and portions of the plurality of second locking structures are located inside the needle insertion sleeve and abut against the inner sidewall of the needle insertion sleeve. The distal end of the drive rod has a second limiting structure, which cooperates with the second locking structure to lock the second elastic element in a compressed state. When the first elastic element drives the needle insertion sleeve to move toward the flange edge until a portion of the second locking structure is exposed from inside the needle insertion sleeve, the injection stage begins. At this time, several of the second locking structures open to unlock the second limiting structure, and the second elastic element releases elastic force to drive the drive rod to push the injection push rod to move.

7. The automatic injection device according to any one of claims 2-6, characterized in that, The needle cartridge system includes a cartridge shell, a needle cartridge sleeve, a limiting cam sleeve, and a buffer elastic element; The chamber shell and the outer shell are detachably connected; The limiting cam sleeve is disposed inside the housing; The needle chamber sleeve is located inside the chamber shell and passes through the limiting cam sleeve. The distal end face of the needle chamber sleeve is used to abut against the flange edge of the pre-filled syringe. The mounting hole is opened in the needle chamber sleeve. The buffer elastic element is sleeved on the needle magazine sleeve and is located at the protrusion at the far end of the limiting cam sleeve and the needle magazine sleeve.

8. The automatic injection device according to claim 7, characterized in that, The needle cartridge system also includes a depth adjustment ring rotatably disposed on the cartridge shell; The depth adjustment ring is connected to the limiting cam sleeve, and the limiting cam sleeve has a first cam cantilever. The distal outer periphery of the needle magazine sleeve is fixedly provided with a second cam cantilever corresponding to the first cam cantilever; When the depth adjustment ring is rotated, the distance between the first cam cantilever and the second cam cantilever can be adjusted.

9. The automatic injection device according to claim 7, characterized in that, The needle cartridge system also includes a depth adjustment ring rotatably disposed on the cartridge shell; A first cam cantilever is fixedly installed inside the chamber shell; The needle cartridge sleeve is provided with a second cam cantilever, which is located near the far end of the cartridge housing; The depth adjustment ring is connected to the needle cartridge sleeve; When the depth adjustment ring is rotated, the distance between the first cam cantilever and the second cam cantilever can be adjusted.

10. The automatic injection device according to claim 7, characterized in that, The needle cartridge system also includes a reset elastic element and a reset sleeve movably located near the end of the cartridge shell; The inner wall of the chamber shell is provided with a slot along its axial direction; The outer wall of the reset sleeve is provided with a retaining rib corresponding to the limiting groove. The retaining rib is movably located in the retaining groove. The reset sleeve is used to cover the injection needle. The reset elastic element is sleeved on the reset sleeve and is used to apply force to the reset sleeve, causing the reset sleeve, which has retracted into the housing, to extend.

11. The automatic injection device according to claim 4, characterized in that, The drive system also includes buttons and a lock key; The button is movably located at the far end of the housing, and the inner sidewall of the button is provided with an elastic cantilever, which is connected to the locking key. A locking groove is provided at the distal end of the housing, the locking groove being used to accommodate the elastic cantilever, so as to lock the button and the housing; When unlocking, the elastic cantilever moves from the locking slot into the housing by pressing the locking key.

12. The automatic injection device according to claim 11, characterized in that, The button has a start key inside, and the proximal dimension of the start key is larger than the area enclosed by several first locking structures; When the button is pressed, the start button is inserted into the area space to separate the first locking structure from the first limiting structure.

13. The automatic injection device according to claim 12, characterized in that, The drive system also includes a button spring; The button also has a connecting post inside; The button spring is sleeved on the connecting post and is used to apply force to the button; When the pressure on the button is released, the button spring causes the button to reset.

14. The automatic injection device according to claim 4, characterized in that, The drive system also includes a button, a button spring, a locking key, and a locking spring; The button is movably located at the far end of the housing, and the button has a connecting post inside; The button spring is sleeved on the connecting post and is used to drive the button to reset; The locking key is movably disposed in the housing, and the locking key has a baffle located inside the housing, the baffle having a channel; The locking spring is sleeved on the middle part of the locking key and is used to drive the locking key to reset. When unlocking, the locking key is pressed to align the channel with the connecting post, allowing the connecting post to pass through the channel.

15. The automatic injection device according to claim 5, characterized in that, It also includes a reset remover; One end of the reset remover has a hooked claw, and the other end has a convex shaft; Prior to the insertion phase, the hooked claw is inserted into the needle chamber system to remove the needle cap of the pre-filled syringe; After the injection is completed, the convex shaft abuts against the drive rod and extends into the drive system to reset the primary drive mechanism and the secondary drive mechanism.

16. The automatic injection device according to claim 5, characterized in that, The outer side wall of the drive rod is provided with a limiting protrusion along its axial direction, and the inner side wall of the needle insertion sleeve is provided with a limiting recess along its axial direction. The limiting protrusion and the limiting recess are slidably engaged.

17. The automatic injection device according to claim 7, characterized in that, The side wall of the chamber is provided with an observation window, which is used to reveal the piston position of the pre-filled syringe.

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