Excitation assembly for pre-filled automatic injection pen and pre-filled automatic injection pen

Abstract

The present invention provides an excitation assembly for a pre-filled automatic injection pen and a pre-filled automatic injection pen. The excitation assembly of the pre-filled automatic injection pen comprises a support frame fixed in a housing and configured for limiting initial positions of a push rod, a spring buckle, and a protective sleeve at the initial time; the push rod, installed in the support frame, positioned by the support frame at the initial time, and driven by an excitation spring to drive a pre-filling injection syringe to move after the protective sleeve is triggered, so as to complete the automatic injection; the protective sleeve, installed outside the support frame, buckled outside the support frame at the initial time, and driven by an excitation sleeve to move, so as to trigger the push rod and prevent the excitation sleeve from moving backwards after the movement to protect a syringe needle; the excitation spring, installed inside the push rod and configured for, after being triggered, providing an ejection force for the push rod and providing an ejection force for the spring buckle after the push rod is detached from the spring buckle; and the spring buckle, installed between the support frame and the push rod and driven by the excitation spring to eject and impact a rear cover so as to make a sound after the injection is finished.

Description

A triggering component of a prefilled automatic injection pen and a prefilled automatic injection pen Technical Field

[0001] The present invention belongs to the technical field of automatic injection, and in particular relates to an excitation component of a prefilled automatic injection pen and the prefilled automatic injection pen. Background Art

[0002] Prefilled automatic injection pens generally include an injection start mechanism of a prefilled syringe, an injection drive mechanism, an injection prompt mechanism, and a needle protection mechanism after the injection is completed. Regarding the injection start mechanism, a start button is generally set at the end of the injection pen or on the side near the end. The start button is generally pressed by the thumb or squeezed by the palm of the hand to realize the action of the injection start mechanism, thereby causing the injection drive mechanism to drive the injection. Regarding the injection drive mechanism, elastic elements such as springs or mechanisms such as electric drives are generally used to realize the injection action of the syringe. Regarding the injection prompt mechanism, when the plunger of the syringe reaches the bottom of the syringe, that is, when the injection action is completed, relevant prompts such as sound, vision, and touch are generated through relevant mechanisms to prompt the user that the injection is completed. Furthermore, some products (such as BD Intevia) are also provided with a needle removal prompt. When the plunger reaches the bottom of the syringe, a delay mechanism is activated. After a certain period of time, the delay mechanism generates relevant prompts such as sound, vision, and touch to prompt the user to remove the needle. Regarding the needle protection mechanism after the injection is completed, a needle protection cover is generally set on one side of the needle, which is activated and fixed after the injection is completed to achieve shielding protection for the needle and prevent the automatic injection pen from stabbing the user after use.

[0003] Existing automatic injection pens have the following disadvantages:

[0004] 1. The needle protection mechanism cannot be locked after the injection is completed.

[0005] 2. The existing injection prompt mechanism has the problem of false prompts.

[0006] 3. The existing injection drive mechanism has the problem of being triggered by mistake.

[0007] Summary of the Invention

[0008] In response to the problems described in the above background technology, the present invention aims to provide an activation component and a prefilled automatic injection pen that are reliable in activation, have a reliable injection completion reminder function, and can achieve needle protection.

[0009] The technical solution adopted in the present invention is:

[0010] An activation component for a prefilled automatic injection pen, comprising

[0011] A support frame, which is fixed in the housing and is used to initially define the initial positions of the push rod, the spring buckle, and the protective cover;

[0012] The push rod is installed in the support frame and is initially positioned by the support frame. After the protective cover is triggered, it drives the pre-filled syringe to move and automatically insert the needle under the drive of the excitation spring;

[0013] The protective sleeve is installed outside the support frame. Initially, it is buckled outside the support frame and can be moved by the excitation sleeve to trigger the push rod. At the same time, it can limit the excitation sleeve from moving backward to protect the needle after moving;

[0014] The trigger spring is installed inside the push rod through the spring buckle, and is used to provide a launching force to the push rod after being triggered, and to provide a launching force to the spring buckle after the push rod is separated from the spring buckle;

[0015] The spring clip is installed between the support frame and the push rod. After the injection is completed, it is driven by the excitation spring to eject and hit the back cover to make a sound;

[0016] The back cover is fixed to the rear end of the support frame and is used to collide with the spring buckle to produce sound.

[0017] Furthermore, the support frame is provided with a first positioning groove for initially cooperating with the protective cover for positioning, the support frame is provided with a limiting portion on the rear side of the first positioning groove for cooperating with the protective cover for positioning after movement, the front end of the support frame is provided with a positioning portion for initially cooperating with the spring buckle for positioning, the support frame is provided with a first cantilever, and the inner wall of the first cantilever is provided with a first positioning buckle for initially cooperating with the push rod for positioning, the first cantilever is initially pressed by the protective cover so that the first positioning buckle is buckled on the push rod, the rear end of the support frame is provided with a second positioning groove for fixing the back cover, and the outer surface of the support frame is symmetrically provided with arc-shaped protrusions for propping up the protective cover to resist the excitation cover.

[0018] Furthermore, the protective cover has a deformable front end, which can be expanded under the action of the support frame to support the rear end of the excitation cover. A linkage part is protruded on the outer surface of the deformable front end, and the linkage part is driven by the rear end of the excitation cover to move the protective cover backward. A second positioning buckle is provided on the inner side of the rear end of the protective cover, and the second positioning buckle can be buckled on the support frame initially and after movement. The protective cover is provided with a first sliding groove for accommodating the protrusion initially and providing expansion space for the first cantilever after movement.

[0019] Furthermore, the push rod is provided with a third positioning groove which cooperates with the first positioning buckle for initial positioning.

[0020] Furthermore, the longitudinal section of the spring clip is an E-shaped structure, and its front end is provided with a snap-fitting portion that cooperates with the support frame for positioning. The snap-fitting portion is initially pressed and snapped onto the support frame by the push rod. A positioning rod is provided in the middle of the spring clip, and the positioning rod is passed through the push rod for positioning and installing the excitation spring.

[0021] A prefilled automatic injection pen comprising

[0022] a housing, which is a hollow structure;

[0023] The pen cap is snapped onto the head of the housing and can cause the inner protective rubber cover of the prefilled syringe to fall off together with it when it is pulled off;

[0024] The excitation sleeve is movably mounted in the housing and is provided with a return spring for resetting along the axial direction between the housing and the excitation sleeve. The head of the excitation sleeve is exposed outside the housing and can trigger the excitation assembly when it moves from the initial position to the limit position.

[0025] The prefilled syringe is clamped on the fixed seat when pre-filled. When the activation sleeve moves from the initial position to the extreme position, the injection end of the prefilled syringe is always hidden in the needle sheath. When the injection end of the prefilled syringe is triggered, it moves instantly, extending the activation sleeve to realize automatic needle insertion.

[0026] A fixing seat is fixedly installed between the ignition sleeve and the prefilled syringe, and initially defines the initial position of the prefilled syringe and provides support when the prefilled syringe is automatically inserted into the needle;

[0027] The above-mentioned excitation component of the pre-filled automatic injection pen is installed in the shell.

[0028] Furthermore, the head of the push rod is the pushing end that contacts the rubber stopper of the prefilled syringe, and the interior of the push rod is a hollow structure that accommodates the excitation spring.

[0029] Furthermore, the excitation sleeve includes an excitation sleeve body for protecting the needle tip, and a symmetrically arranged excitation portion is provided at the tail end of the excitation sleeve body. A slot hole is provided on the excitation portion for the second cantilever of the fixing seat to move, and a protective buckle is provided on the inner side of the excitation portion at one end of the slot hole, which radially protrudes to limit the initial position of the second cantilever of the fixing seat.

[0030] Furthermore, the fixing seat is symmetrically provided with a second cantilever, and the second cantilever is provided corresponding to the slot of the excitation sleeve, and the outer side of the end of the second cantilever is provided with an outer buckle which initially cooperates with the protective buckle of the excitation sleeve to limit the position of the second cantilever, and the inner side of the end of the second cantilever is provided with an inner buckle which initially cooperates with the protruding tail end of the prefilled syringe to support the prefilled syringe; the inner wall of the fixing seat is provided with a stepped surface for limiting the movement of the prefilled syringe, and the inner wall of the fixing seat is axially provided with vertical ribs from the stepped surface to its tail end to provide support for the prefilled syringe when the needle is automatically inserted.

[0031] Furthermore, the housing is provided with a visual window for checking the status of the drug solution, whether the pre-filled syringe is positioned correctly, and for checking the infusion status after the injection is completed.

[0032] Furthermore, the pen cap is provided with symmetrically arranged pen cap buckles, which are initially engaged with the internal protective rubber sleeve of the pre-filled syringe.

[0033] Furthermore, the back cover is symmetrically provided with connecting buckles that engage with the second positioning grooves on the support frame.

[0034] Compared with the prior art, the present invention has the following significant advantages:

[0035] 1. The push rod can be activated by moving the protective cover, and the activation is reliable and stable.

[0036] 2. After the push rod is injected, it will be separated from the spring buckle. Under the action of the excitation spring, the spring buckle can move backward and hit the rear cover to make a sound, thereby realizing the injection completion reminder function and ensuring the reliability of the end reminder.

[0037] 3. The protective cover can limit the backward movement of the excitation cover after the injection is completed, thereby protecting the needle and preventing accidental injury. It cannot be used a second time.

[0038] 4. It has a window function, which allows you to observe the injection status after the prompt sound ends to ensure the continuity and integrity of the injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a schematic diagram of the explosion structure of Example 1 of the present invention;

[0040] FIG2 is a schematic cross-sectional view of the structure of the first embodiment of the present invention in an initial state;

[0041] FIG3 is a second schematic cross-sectional view of the structure of the first embodiment of the present invention in the initial state;

[0042] FIG4 is a schematic cross-sectional view of the structure after excitation of the first embodiment of the present invention;

[0043] FIG5 is a schematic structural diagram of a support frame according to a first embodiment of the present invention;

[0044] FIG6 is a schematic structural diagram of a protective cover according to a first embodiment of the present invention;

[0045] FIG7 is a schematic structural diagram of a spring buckle according to a first embodiment of the present invention;

[0046] FIG8 is a schematic structural diagram of a push rod according to a first embodiment of the present invention.

[0047] FIG9 is a schematic diagram of the explosion structure of Example 2 of the present invention;

[0048] FIG10 is a schematic diagram of the appearance structure of the second embodiment of the present invention;

[0049] 11 is a schematic cross-sectional view of the structure of the first embodiment of the present invention in the initial state;

[0050] 12 is a second schematic cross-sectional view of the structure of the second embodiment of the present invention in the initial state;

[0051] 13 is a schematic cross-sectional view of the structure after excitation of Example 2 of the present invention;

[0052] 14 is a schematic cross-sectional view of the limiting structure of the excitation sleeve and the protective sleeve after needle removal according to the second embodiment of the present invention;

[0053] 15 is a schematic structural diagram of a pen cap according to a second embodiment of the present invention;

[0054] 16 is a schematic structural diagram of a housing according to a second embodiment of the present invention;

[0055] FIG17 is a schematic structural diagram of an excitation sleeve according to a second embodiment of the present invention;

[0056] 18 is a schematic structural diagram of a prefilled syringe according to a second embodiment of the present invention;

[0057] FIG19 is a schematic structural diagram of a fixing base according to a second embodiment of the present invention;

[0058] FIG20 is a schematic structural diagram of the back cover of the second embodiment of the present invention.

[0059] Among them, 1. Pen cap, 1a, Pen cap buckle, 2. Shell, 21, Visual window, 3. Excitation sleeve, 31, Excitation sleeve body, 32, Excitation part, 33, Slot, 34, Protective buckle, 4, Return spring, 5, Prefilled syringe, 51, Internal protective rubber sleeve, 52, Protruding tail end, 6, Fixed seat, 61, Second cantilever, 62, External buckle, 63, internal buckle, 64, stepped surface, 65, erecting rib position, 7, supporting frame, 71, first positioning groove, 72, limiting part, 73, positioning part, 74, first cantilever, 75, first positioning buckle, 76, second positioning groove, 77, raised part, 8, push rod, 81, third positioning groove, 82, pushing end, 9, excitation spring, 10, protective cover, 101, deformable front end, 102, linkage part, 103, second positioning buckle, 104, first sliding groove, 11, spring buckle, 111, buckling part, 112, positioning rod, 12, back cover, 121, connecting buckle. DETAILED DESCRIPTION

[0060] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents within the scope of the claims.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more, unless otherwise clearly defined.

[0062] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0064] Example 1

[0065] 1-8, this embodiment provides an activation assembly for a pre-filled automatic injection pen, comprising

[0066] The support frame 7 is fixed in the housing 2 and is used to initially define the initial positions of the push rod 8, the spring buckle 11, and the protective cover 10;

[0067] The push rod 8 is installed in the support frame 7 and is initially positioned by the support frame 7. After the protective cover 10 is triggered, it drives the pre-filled syringe 5 to move and complete the automatic needle insertion under the drive of the excitation spring 9;

[0068] The protective sleeve 10 is mounted on the outside of the support frame 7. Initially, it is fastened to the outside of the support frame 7 and can be moved by the excitation sleeve 3 to trigger the push rod 8. At the same time, after moving, it can limit the excitation sleeve 3 from moving backward to protect the needle;

[0069] The trigger spring 9 is installed inside the push rod 8 through the spring buckle 11, and is used to provide an ejection force to the push rod 8 after being triggered, and to provide an ejection force to the spring buckle 11 after the push rod 8 is separated from the spring buckle 11;

[0070] The spring clip 11 is installed between the support frame 7 and the push rod 8. After the injection is completed, it is driven by the excitation spring 9 to eject and hit the back cover 12 to make a sound;

[0071] The rear cover 12 is fixed to the rear end of the support frame 7 and is used to collide with the spring buckle 11 to produce sound.

[0072] In this embodiment, the support frame 7 is provided with a first positioning groove 71 for initially cooperating with the protective cover 10. A stopper 72 is provided behind the first positioning groove 71 for cooperating with the protective cover after movement. A positioning portion 73 is provided at the front end of the support frame 7 for initially cooperating with the spring clip 11. A first positioning buckle 75 is provided on the inner wall of the support frame 7 for initially cooperating with the push rod. A second positioning groove 76 is provided at the rear end of the support frame 7 for securing the rear cover. The support frame 7 is provided with a first cantilever 74. The first positioning buckle 75 is disposed inside the first cantilever 74. The first cantilever 74 is initially press-fitted by the protective cover 10, so that the first positioning buckle 75 engages the push rod 8. The push rod 8 is provided with a third positioning groove 81 for initially cooperating with the first positioning buckle 75. The outer surface of the support frame 7 is symmetrically provided with arc-shaped protrusions 77. The deformable front end 101 of the protective cover 10 moves to the protrusions 77, where it is stretched and deformed.

[0073] The front end wall of the protective cover 10 described in this embodiment is provided with a notch, thereby forming a deformable structure at the front end. The deformable front end 101 is symmetrically arranged. The deformable front end 101 can be stretched open under the action of the support frame 7 to resist the rear end of the excitation cover. A linkage portion 102 is protruding from the outer surface of the deformable front end 101. The linkage portion 102 is driven by the rear end of the excitation cover to drive the protective cover to move backward. A second positioning buckle 103 is provided on the inner side of the rear end of the protective cover 10. The second positioning buckle 103 can be fastened to the support frame 7 at the beginning and after movement. The second positioning buckle 103 is provided on the cantilever of the protective cover 10 to provide deformation space. The protective cover 10 is provided with a first slide groove 104 which initially accommodates the protrusion 77 and provides a space for the first cantilever 74 to be expanded after movement. The setting of the first slide groove 104 ensures that the protective cover 10 does not deform initially and in the front part of the backward movement process. It is only when the deformable front end 101 moves to the protrusion 77 that it is expanded and deformed, thereby limiting the backward movement of the excitation cover. Moreover, when the first slide groove 104 moves to the position of the first cantilever 74, the first cantilever 74 can be expanded by the push rod 8, so that the push rod 8 leaves the initial position and moves under the action of the excitation spring 9.

[0074] The spring clip 11 of this embodiment has an E-shaped longitudinal cross-section, with a snap-fit ​​portion 111 at its front end for positioning with the support frame 7. Initially, the snap-fit ​​portion 111 is press-fitted by the push rod 8 and snapped onto the support frame 7. A positioning rod 112 is provided in the middle of the spring clip 11. The positioning rod 112 extends through the push rod 8 and is used to position and install the excitation spring 9.

[0075] In this embodiment, an inner wall of the first positioning groove 71 , an inner wall of the second positioning groove 76 , an inner wall of the third positioning groove 81 , and the locking portion 111 are all provided with an inclined surface structure for disengaging from the initial position.

[0076] When installing the present invention, the protective cover 10 is installed outside the support frame 7. At this time, the second positioning buckle 103 is buckled in the first positioning groove 71, the protrusion 77 is located in the first slide groove 104, and the first cantilever 74 is pressed by the protective cover 10; the spring buckle 11 is installed in the support frame 7. At this time, the buckling part 111 is buckled with the positioning part 73 for positioning; the excitation spring 9 is put on the positioning rod 112, and then the push rod 8 is installed in the support frame 7. At this time, the first positioning buckle 75 is buckled in the third positioning groove 81; the back cover 12 is buckled on the rear end of the support frame 7, and the connecting buckle on the back cover 12 is buckled in the second positioning groove 76.

[0077] When the locking cam 73 is in the closed position, the locking cam 73 is in the closed position, and the first and second locking cams 73 are in the closed position, so that the locking cam 73 is locked and the locking cam 73 is locked.

[0078] At the same time, the deformable front end 101 of the protective sleeve 10 moves to the protrusion 77 and is stretched and deformed, thereby limiting the backward movement path of the excitation sleeve, that is, the excitation sleeve is in a state of protecting the needle after the needle is removed, and cannot be operated again or accidentally injured.

[0079] The present invention activates the push rod 8 by moving the protective sleeve 10, ensuring reliable and stable activation. After injection is complete, the push rod 8 disengages from the spring catch 11. Driven by the activation spring 9, the spring catch 11 moves backward, striking the rear cover 12 and producing a sound, thereby providing an injection completion reminder and ensuring reliable end-of-injection notification. The protective sleeve 10 limits the backward movement of the activation sleeve after injection, protecting the needle and preventing accidental injury. Furthermore, the needle cannot be reused.

[0080] Example 2

[0081] Referring to Figures 9-20, this embodiment provides a prefilled automatic injection pen, including a pen cap 1, an outer shell 2, an excitation sleeve 3, a return spring 4, a prefilled syringe 5, a fixing seat 6, a support frame 7, a push rod 8, an excitation spring 9, a protective sleeve 10, a spring buckle 11, and a back cover 12, wherein the support frame 7, the push rod 8, the excitation spring 9, the protective sleeve 10, the spring buckle 11, and the back cover 12 constitute an excitation assembly, which is installed in the outer shell 2.

[0082] The pen cap 1 of this embodiment snaps onto the top of the housing 2 and, when removed, removes the internal protective rubber sheath of the prefilled syringe 5. Specifically, the pen cap 1 is provided with symmetrically arranged cap buckles 1a, which initially engage with the internal protective rubber sheath 51 of the prefilled syringe 5. When the pen cap 1 is removed, the internal protective rubber sheath 51 of the prefilled syringe 5 separates from the prefilled syringe 5, exposing the needle.

[0083] The housing 2 of this embodiment is a hollow structure. The housing 2 is provided with a visual window 21 for checking the status of the drug solution, whether the pre-filled syringe is positioned correctly, and for checking the infusion status after registration is completed.

[0084] The excitation sleeve 3 described in this embodiment is movably installed in the housing 2 and is axially provided with a return spring 4 for resetting between the housing 2. The head of the excitation sleeve 3 is exposed outside the housing 2. When it moves from the initial position to the extreme position, it can trigger the excitation assembly. Specifically, the excitation sleeve 3 includes an excitation sleeve body 31 for protecting the needle tip. The tail end of the excitation sleeve body 31 is extended with a symmetrically arranged excitation portion 32. The excitation portion 32 is provided with a slot 33 for the second cantilever 61 of the fixing seat 6 to move. The inner side of the excitation portion 32 is provided with a protective buckle 34 at one end of the slot 33, which radially protrudes to limit the initial position of the second cantilever 61 of the fixing seat 6. After the rear end of the excitation portion 32 moves, it contacts the linkage portion 101 of the protective sleeve 10, thereby driving the protective sleeve 10 to move backward to realize the excitation of the excitation assembly.

[0085] The prefilled syringe 5 described in this embodiment is clamped on the fixing seat 6 when pre-installed. During the process of the activation sleeve 3 moving from the initial position to the extreme position, the injection end of the prefilled syringe 5 is always hidden in the needle sheath. When the injection end of the prefilled syringe 5 is triggered, it is displaced instantly and the activation sleeve 3 is extended to realize automatic needle insertion. Specifically, the prefilled syringe 5 is clamped at the position of the second cantilever 61 on the fixed seat 6 when pre-installed. This position is the initial position of the prefilled syringe 5. When excited, the excitation sleeve 3 moves from the initial position to the extreme position. When the excitation sleeve 3 is at the extreme position, the injection end of the prefilled syringe 5 is hidden in the excitation sleeve 3. When the injection end of the prefilled syringe 5 is triggered, it is displaced instantly, moving from the initial position to the step surface 64 on the fixed seat 6, and exceeding the excitation sleeve 3 to realize automatic needle insertion; the injection end is a needle structure, and is initially provided with an internal protective rubber sleeve 51 to protect the injection end; the prefilled syringe 5 is pre-filled with liquid and sealed by a rubber plug; the protruding tail end 52 of the prefilled syringe 5 is protruding, which can be limited to the initial position by the fixed seat 6, and cooperates with the step surface 64 on the fixed seat 6 to limit the moving distance.

[0086] The fixing seat 6 described in this embodiment is fixedly installed between the excitation sleeve 3 and the prefilled syringe 5, and initially defines the initial position of the prefilled syringe 5 and can provide support when the prefilled syringe 5 is automatically inserted; the fixing seat 6 is symmetrically provided with a second cantilever 61, and the second cantilever 61 is provided corresponding to the slot 33 of the excitation sleeve 3, and the outer side of the end of the second cantilever 61 is provided with an outer buckle 62 which initially cooperates with the protective buckle 34 of the excitation sleeve 3 to define the position of the second cantilever 61, and the inner side of the end of the second cantilever 61 is provided with an inner buckle 63 which initially cooperates with the protruding tail end 52 of the prefilled syringe 5 to support the prefilled syringe 5; the inner wall of the fixing seat 6 is provided with a stepped surface 64 for limiting the movement of the prefilled syringe 5, and the inner wall of the fixing seat 6 is axially provided with a vertical rib 65 from the stepped surface 64 to its tail end to provide support for the prefilled syringe 5 when the prefilled syringe 5 is automatically inserted. After the outer buckle 62 of the second cantilever 61 of the fixing base 6 is separated from the protective buckle 34, the second cantilever 61 can be deformed in the slot 33, so that the prefilled syringe 5 is pushed open by the push rod 8 and moves down to the stepped surface 64. A silicone gasket can be provided on the stepped surface 64 to protect the protruding tail end 52 of the prefilled syringe 5 and prevent it from breaking during movement.

[0087] The support frame 7 of this embodiment is fixed in the housing 2 and is used to initially define the initial positions of the push rod 8, the spring buckle 11, and the protective cover 10. Specifically, the support frame 7 is provided with a first positioning groove 71 for initially cooperating with the protective cover 10 for positioning. The support frame 7 is provided with a limiting portion 72 on the rear side of the first positioning groove 71 for cooperating with the protective cover 10 for positioning after movement. The front end of the support frame 7 is provided with a positioning portion 73 for initially cooperating with the spring buckle 11 for positioning. The support frame 7 is provided with a first cantilever 74. The inner wall of the first cantilever 74 is provided with a first positioning buckle 75 for initially cooperating with the push rod 8 for positioning. The first cantilever 74 is initially press-fitted by the protective cover 10 so that the first positioning buckle 75 is buckled on the push rod 8. The rear end of the support frame 7 is provided with a second positioning groove 76 for fixing the back cover 12. The outer surface of the support frame 7 is symmetrically provided with arc-shaped protrusions 77 for propping up the protective cover 10 against the excitation cover 3.

[0088] The push rod 8 described in this embodiment is installed in the support frame 7 and is initially positioned by the support frame 7. After the protective cover 10 is triggered, it drives the prefilled syringe 5 to move and complete automatic needle insertion under the drive of the excitation spring 9. Specifically, the push rod 8 is provided with a third positioning groove 81 that cooperates with the first positioning buckle 75 for initial positioning. The head of the push rod 8 is the pushing end 82 that contacts the plug of the prefilled syringe 5. The interior of the push rod 8 is a hollow structure that accommodates the excitation spring 9.

[0089] The protective cover 10 described in this embodiment is installed outside the support frame 7. Initially, it is fastened to the outside of the support frame 7 and can be moved under the drive of the excitation cover 3 to trigger the push rod 8. At the same time, it can limit the excitation cover 3 from moving backward to protect the needle. Specifically, a notch is provided on the front wall of the protective cover 10, thereby forming a deformable structure at the front end. The deformable front end 101 is symmetrically arranged. The deformable front end 101 can be stretched open under the action of the support frame 7 to resist the rear end of the excitation cover 3. A linkage part 102 is protruded on the outer surface of the deformable front end 101. The linkage part 102 is driven by the rear end of the excitation cover 3 to drive the protective cover 10. When moving backward, a second positioning buckle 103 is provided on the inner side of the rear end of the protective cover 10, and the second positioning buckle 103 can be buckled on the support frame 7 at the initial time and after movement. The protective cover 10 is provided with a first slide groove 104 which accommodates the protrusion 77 at the initial time and provides a support space for the first cantilever 74 after movement. The setting of the first slide groove 104 makes the protective cover 10 not deformed at the initial time and in the front part of the backward movement process. It is only when the deformable front end 101 moves to the protrusion 77 that it is stretched and deformed, thereby limiting the backward movement of the excitation cover 3. Moreover, when the first slide groove 104 moves to the position of the first cantilever 74, the first cantilever 74 can be stretched by the push rod 8, so that the push rod 8 leaves the initial position and moves under the action of the excitation spring 9.

[0090] The excitation spring 9 described in this embodiment is installed inside the push rod 8 through the spring clip 11, and is used to provide an ejection force to the push rod 8 after being triggered, and to provide an ejection force to the spring clip 11 after the push rod 8 is separated from the spring clip 11.

[0091] The spring clip 11 of this embodiment is installed between the support frame 7 and the push rod 8. After the injection is completed, it is driven by the excitation spring 9 to eject and hit the rear cover 12 to produce a sound. Specifically, the longitudinal cross-section of the spring clip 11 is an E-shaped structure. Its front end is provided with a snap-fit ​​portion 111 that cooperates with the support frame 7 for positioning. The snap-fit ​​portion 111 is initially press-fitted and snap-fitted to the support frame 7 by the push rod 8. A positioning rod 112 is provided in the middle of the spring clip 11. The positioning rod 112 is inserted into the push rod 8 to position and install the excitation spring 9.

[0092] The rear cover 12 of this embodiment is fixed to the rear end of the support frame 7 and is used to collide with the spring buckle 11 to produce sound. Specifically, the rear cover 12 is symmetrically provided with connecting buckles 121 that buckle with the second positioning groove 76 on the support frame 7.

[0093] In this embodiment, an inner wall of the first positioning groove 71 , an inner wall of the second positioning groove 76 , an inner wall of the third positioning groove 81 , and the locking portion 111 are all provided with an inclined surface structure for disengaging from the initial position.

[0094] When installing the excitation component of the present invention, the protective cover 10 is installed outside the support frame 7. At this time, the second positioning buckle 103 is buckled in the first positioning groove 71, the protrusion 77 is located in the first slide groove 104, and the first cantilever 74 is pressed by the protective cover 10; the spring buckle 11 is installed in the support frame 7. At this time, the buckling part 111 is buckled with the positioning part 73 for positioning; the excitation spring 9 is put on the positioning rod 112, and then the push rod 8 is installed in the support frame 7. At this time, the first positioning buckle 75 is buckled in the third positioning groove 81; the back cover 12 is buckled on the rear end of the support frame 7, and the connecting buckle 121 on the back cover 12 is buckled in the second positioning groove 76.

[0095] When assembling the front portion of the prefilled automatic injection pen, the return spring 4 is installed into the ignition sleeve 3, which is then installed into the housing 2. The pen cap 1 is then installed into the housing 2 and placed over the ignition sleeve 3. The fixing base 6 is then installed into the housing 2 and positioned in conjunction with the ignition sleeve 3. The second cantilever 61 on the fixing base 6 is positioned within the slot 33 of the ignition sleeve 3, and the outer buckle 62 cooperates with the protective buckle 34 for initial positioning. The prefilled syringe 5 is then inserted into the fixing base 6, with the inner buckle 63 cooperating with the protruding tail end 52 to limit the position. Finally, the assembled ignition assembly is installed into the housing 2 and secured to the housing 2 by snapping the support frame 7 therewith.

[0096] When the present invention is used, the pen cap 1 is pulled off to separate the internal protective rubber sleeve 51 from the prefilled syringe 5. The excitation sleeve 3 is pressed down, and the excitation sleeve 3 moves backward. The excitation portion 32 of the excitation sleeve 3 touches the linkage portion 102 of the protective sleeve 10. The protective sleeve 10 moves backward under the drive of the excitation sleeve, and the second positioning buckle 103 disengages from the first positioning groove 71. The protective sleeve 10 continues to move backward, and the second positioning buckle 103 reaches the limit portion 72. At this time, the first slide groove 104 moves to the position of the first cantilever 74. The first cantilever 74 loses the pressing force. Under the action of the excitation spring 9, the push rod 8 pushes the first positioning buckle 75 outward to disengage from the third positioning groove 81, and the push rod 8 moves forward along the inner wall of the support frame 7; at the same time, the protective buckle 34 of the excitation sleeve 3 moves upward, and the second cantilever 61 on the fixing seat 6 moves toward the outer shell. 2. It has freedom in the direction of excitation. At the same time, the slot 33 on the excitation sleeve 3 provides space for the second cantilever 61 to deform. The push rod 8 moves downward under the elastic force of the excitation spring 9, pushing the prefilled syringe 5 to break open the inner buckle 63 and move downward, and the needle tip is exposed from the excitation sleeve 3 and enters the skin; the push rod 8 continues to move downward to push the rubber plug in the prefilled syringe 5 to implement the injection. When the push rod 8 moves to the extreme position, that is, the injection is completed, the push rod 8 will be completely separated from the spring buckle 11. At this time, the spring buckle 11 is under the action of the excitation spring 9, and the buckling part 111 of the spring buckle 11 is separated from the positioning part 73 of the support frame 7. The spring buckle 11 is ejected and hits the back cover 12 to make a sound, indicating that the injection is completed.

[0097] At the same time, the deformable front end 101 of the protective sleeve 10 moves to the protrusion 77 and is stretched and deformed, thereby limiting the backward movement path of the excitation sleeve 3, that is, the excitation sleeve 3 is in a state of protecting the needle after the needle is removed, and cannot be operated again or accidentally injured.

[0098] The present invention can activate the push rod 8 by moving the protective cover 10, and the activation is reliable and stable. After the push rod 8 is injected, it disengages from the spring clip 11. Under the action of the activation spring 9, the spring clip 11 can move backward and hit the rear cover 12 to make a sound, thereby realizing the injection completion reminder function and ensuring the reliability of the end prompt. The protective cover 10 can limit the backward movement of the activation cover 3 after the injection is completed, thereby realizing needle protection, preventing accidental injury, and preventing secondary use. The present invention has a window function, which allows the injection status to be observed after the end prompt sound, ensuring the continuity and integrity of the injection.

Claims

1. An activation assembly for a prefilled automatic injection pen, characterized in that: include A support frame (7) is fixed in the housing (2) and is used to initially define the initial positions of the push rod (8), the spring buckle (11) and the protective cover (10); A push rod (8) is installed in the support frame (7) and is initially positioned by the support frame (7). After the protective cover is triggered, the push rod (8) drives the prefilled syringe (5) to move and automatically insert the needle under the drive of the excitation spring (9); A protective sleeve (10) is mounted outside the support frame (7), is initially buckled outside the support frame (7), and can be driven by the excitation sleeve (3) to move and trigger the push rod (8), and can also limit the excitation sleeve (3) from moving backwards to protect the needle after moving; An excitation spring (9) is installed inside the push rod (8) through a spring buckle (11) and is used to provide an ejection force to the push rod (8) after being triggered, and to provide an ejection force to the spring buckle (11) after the push rod (8) is separated from the spring buckle (11); A spring buckle (11) is installed between the support frame (7) and the push rod (8), and after the injection is completed, it is driven by the excitation spring (9) to eject and hit the rear cover (12) to make a sound; The rear cover (12) is fixed to the rear end of the support frame (7) and is used for colliding with the spring buckle (11) to produce sound.

2. The ignition assembly of a prefilled automatic injection pen according to claim 1, characterized in that: The support frame (7) is provided with a first positioning groove (71) for initially cooperating with the protective cover (10), the support frame (7) is provided with a limiting portion (72) on the rear side of the first positioning groove (71) for cooperating with the protective cover (10) after movement, the front end of the support frame (7) is provided with a positioning portion (73) for initially cooperating with the spring buckle (11), the support frame (7) is provided with a first cantilever (74), the inner wall of the first cantilever (74) is provided with a first positioning buckle (75) for initially cooperating with the push rod (8), the first cantilever (74) is initially press-fitted by the protective cover (10) so as to The first positioning buckle (75) is buckled onto the push rod (8), the rear end of the support frame (7) is provided with a second positioning groove (76) for fixing the rear cover (12), and the outer surface of the support frame (7) is symmetrically provided with arc-shaped protrusions (77) for propping up the protective cover (10) against the excitation cover (3).

3. The ignition assembly of a prefilled automatic injection pen according to claim 2, characterized in that: The protective cover (10) has a deformable front end (101), and the deformable front end (101) can be expanded under the action of the support frame (7) to resist the rear end of the excitation cover (3). A linkage part (102) is protruding on the outer surface of the deformable front end (101). The linkage part (102) is driven by the rear end of the excitation cover (3) to drive the protective cover (10) to move backward. A second positioning buckle (103) is provided on the inner side of the rear end of the protective cover (10). The second positioning buckle (103) can be buckled on the support frame (7) at the beginning and after movement. The protective cover (10) is provided with a first sliding groove (104) for accommodating the protrusion (77) at the beginning and providing expansion space for the first cantilever (74) after movement.

4. The ignition assembly of a prefilled automatic injection pen according to claim 2, characterized in that: The push rod (8) is provided with a third positioning groove (81) which cooperates with the first positioning buckle (76) for initial positioning.

5. The ignition assembly of a prefilled automatic injection pen according to claim 1, characterized in that: The longitudinal section of the spring buckle (11) is an E-shaped structure, and a buckling portion (111) is provided at its front end for cooperating with the support frame (7) for positioning. The buckling portion (111) is initially pressed and buckled onto the support frame (7) by the push rod (8). A positioning rod (112) is provided in the middle of the spring buckle (11), and the positioning rod (112) is inserted into the push rod (8) for positioning and installing the excitation spring (9).

6. A prefilled automatic injection pen comprising A housing (2) which is a hollow structure; A pen cap (1) which is snapped onto the head of the housing (2) and can drive the inner protective rubber sleeve (51) of the prefilled syringe (5) to fall off together with it when it is pulled off; The excitation sleeve (3) is movably installed in the housing (2) and is axially arranged between the housing (2). A return spring (4) is provided for resetting, and the head of the excitation sleeve (3) is exposed outside the housing (2). When the excitation sleeve (3) moves from the initial position to the limit position, it can trigger the excitation component; The prefilled syringe (5) is clamped on a fixing seat (6) when pre-installed. When the activation sleeve (3) moves from an initial position to an extreme position, the injection end of the prefilled syringe (5) is always hidden in the needle sheath. When the injection end of the prefilled syringe (5) is triggered, it is instantly displaced and extends out of the activation sleeve (3) to achieve automatic needle insertion. A fixing seat (6) is fixedly installed between the ignition sleeve (3) and the prefilled syringe (5), and initially defines the initial position of the prefilled syringe (5) and can provide support when the prefilled syringe (5) is automatically inserted; Features: The housing (2) contains an activation assembly for a prefilled automatic injection pen according to any one of claims 1 to 5.

7. A prefilled automatic injection pen according to claim 6, characterized in that: The head of the push rod (8) is a pushing end (82) that contacts the rubber plug of the prefilled syringe (5), and the interior of the push rod (8) is a hollow structure that accommodates an excitation spring (9).

8. The prefilled automatic injection pen according to claim 6, characterized in that: The excitation sleeve (3) comprises an excitation sleeve body (31) for protecting the needle tip, a symmetrically arranged excitation portion (32) is provided at the rear end of the excitation sleeve body (31), a slot hole (33) for the second cantilever (61) of the fixing seat (6) to move is provided on the excitation portion (32), and a protective buckle (34) is provided on the inner side of the excitation portion (32) at one end of the slot hole (33) for radially protruding and limiting the initial position of the second cantilever (61) of the fixing seat (6).

9. A prefilled automatic injection pen according to claim 8, characterized in that: The fixing seat (6) is symmetrically provided with a second cantilever (61), and the second cantilever (61) is provided corresponding to the slot (33) of the excitation sleeve (3). The outer side of the end of the second cantilever (61) is provided with an outer buckle (62) which initially cooperates with the protective buckle (34) of the excitation sleeve (3) to limit the position of the second cantilever (61), and the inner side of the end of the second cantilever (61) is provided with an inner buckle (63) which initially cooperates with the protruding tail end (52) of the prefilled syringe (5) to support the prefilled syringe (5); the inner wall of the fixing seat (6) is provided with a stepped surface (64) for limiting the movement of the prefilled syringe (5), and the inner wall of the fixing seat (6) is axially provided with a vertical rib position (65) from the stepped surface (64) to its tail end to provide support for the prefilled syringe (5) when the needle is automatically inserted.

10. The prefilled automatic injection pen according to claim 6, characterized in that: The housing (2) is provided with a visual window (21) for checking the status of the drug solution, whether the position of the pre-filled syringe is correct, and for checking the infusion status after the injection is completed.

11. A prefilled automatic injection pen according to claim 6, characterized in that: The pen cap (1) is provided with symmetrically arranged pen cap buckles (1a), and the pen cap buckles (1a) are initially engaged with the internal protective rubber sleeve (51) of the prefilled syringe (5).

12. A prefilled automatic injection pen according to claim 6, characterized in that: The rear cover (12) is symmetrically provided with connection buckles (121) which are engaged with the second positioning grooves (75) on the support frame (7).

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