A dual-chamber automatic injection pen with unlocking and sound-emitting function

Abstract

This invention relates to a dual-chamber automatic injection pen with unlocking and sound-emitting functions, belonging to the field of drug infusion technology. The injection pen includes a pen body; a fixed base fixedly connected to the pen body; a base embedded in and connected to the fixed base; an unlocking component embedded between the fixed base and the base, abutting against the base; a second elastic body sleeved around the outer periphery of the unlocking component, with its two ends abutting against the unlocking component and the fixed base respectively; a push rod embedded in and abutting against the base, and the unlocking component abutting against the push rod; a first elastic body embedded in the push rod, with its two ends abutting against the base and the push rod respectively; a button slidably connected to the pen body, with one end abutting against the push rod; a spiral sleeve connected to the fixed base, internally housing a refill holder and a cartridge bottle, with a needle assembly and a concealed needle assembly mounted on one side of the refill holder. This injection pen integrates unlocking and sound-emitting functions into one component, reducing the number of parts, lowering mold development and material production costs, simplifying the assembly process, and improving production assembly efficiency.

Description

Technical Field

[0001] This invention relates to a dual-chamber automatic injection pen with unlocking and sound-emitting functions, belonging to the field of drug infusion technology. Background Technology

[0002] Dual-chamber automatic injection pens, as portable medical drug delivery devices, are widely used in scenarios such as chronic disease medications, reconstitution injection of lyophilized preparations, home self-administration, and simple injection in clinical outpatient settings. They can realize integrated storage of dual-chamber medications, automatic reconstitution, and quantitative injection. They are easy to operate and suitable for self-administration needs, and have now become a commonly used device in the fields of medical home care and clinical drug delivery.

[0003] Currently, most commercially available dual-chamber automatic injection pens use separate components for the unlocking and sound-generating parts. This separate structure has several drawbacks: First, the large number of parts increases mold development and material production costs, and the cumbersome assembly process significantly reduces production efficiency. Second, the high precision required for the assembly of the two separate parts makes them prone to misalignment, jamming, and loosening, resulting in unsmooth unlocking, malfunctioning sound feedback, or abnormal noises. Third, the large internal space required hinders the miniaturization and lightweight design of the injection pen, and the separate components can easily lead to safety hazards such as accidental locking and lack of injection completion notifications, affecting the user's drug administration experience and medication safety.

[0004] Chinese patent document CN120919462A discloses a dual-cavity automatic injection pen, including a sound-emitting component, an unlocking component, and a release component. By rotating the pen refill holder until the release component is lifted, the constraint on the unlocking component is released. Pressing a button pushes the unlocking component downwards, releasing the push rod, which is then advanced by the injection spring to complete the injection. At the end of the injection, the sound-emitting spring pushes the sound-emitting component to strike a protrusion on the base, thus producing a sound to indicate that the injection is complete. While this injection pen can achieve unlocking and sound emission, its overall structure is complex, requiring multiple components to work together, resulting in cumbersome assembly processes, reduced production efficiency, and a large space occupied by the multiple components, leading to a longer pen body and poor grip and portability.

[0005] Therefore, there is an urgent need for a dual-chamber automatic injection pen that can highly integrate unlocking and sound generation, facilitate assembly, and improve production and assembly efficiency. Summary of the Invention

[0006] To address the aforementioned issues, this invention provides a dual-cavity automatic injection pen with an unlocking and sound-emitting function. This overcomes the problems of numerous parts, high mold development and material production costs, cumbersome assembly processes, significantly reduced production and assembly efficiency, and high precision requirements for separate installation, which can easily lead to misalignment, jamming, loosening, resulting in unsmooth unlocking, malfunctioning sound feedback, or abnormal noises in existing technologies.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: This invention provides a dual-chamber automatic injection pen with unlocking and sound-emitting function, comprising: Pen body; The mounting base is fixedly connected to the pen body; A base, which is embedded in and connected to the fixing seat; The unlocking component is embedded between the fixing base and the base, and abuts against the base; The second elastic body is sleeved on the outer periphery of the unlocking member, and its two ends abut against the unlocking member and the fixing seat, respectively. A push rod, which is embedded in the base and abuts against the base, and the unlocking component abuts against the push rod; A first elastic body is embedded in the push rod, with its two ends abutting against the base and the push rod, respectively. The button is slidably connected to the pen body, and one end abuts against the push rod; The spiral sleeve is connected to the fixed base and has a pen refill holder and a cartridge bottle installed inside. A needle assembly and a hidden needle assembly are installed on one side of the pen refill holder.

[0008] In one embodiment of the present invention, the unlocking component includes a second cantilever and a third cantilever. One end of the second cantilever is provided with a hook-shaped structure, which abuts against the push rod. The third cantilever retracts towards the center of the unlocking component, abuts against the push rod, and strikes the push rod to emit a prompting sound.

[0009] In one embodiment of the present invention, the push rod includes a push rod column, a first cantilever is provided on one side of the push rod column, a second slot is provided on the first cantilever, the hook-shaped structure abuts against the first cantilever, the second slot cooperates with the base, so that the push rod is connected to the base; a fifth inclined surface is provided at one end of the first cantilever, and the fifth inclined surface abuts against the first inclined surface of the button.

[0010] In one embodiment of the present invention, the base is provided with a second groove, a first boss and a third boss, the first cantilever passes through the second groove so that the second hole slot is engaged with the first boss; the unlocking member includes a third groove, one end of the third groove is provided with a sixth inclined surface, the sixth inclined surface abuts against the fourth inclined surface of the third boss.

[0011] In one embodiment of the invention, the push rod includes a second step that can abut against the third cantilever and deform the third cantilever by squeezing it, and the seventh plane of the push rod abuts against the piston of the cartridge bottle.

[0012] In one embodiment of the present invention, the base includes a second protrusion, and the fixing seat includes a seventh protrusion and a third slot. The second protrusion engages with the third slot to connect the fixing seat to the base. The pen body has a first slot, and the seventh protrusion engages with the first slot to connect the fixing seat to the pen body. The direction and number of the seventh protrusion are adapted to the direction and number of the first slot.

[0013] In one embodiment of the present invention, the button includes a cylindrical boss and a first inner cavity. At least one column is provided on the cylindrical boss, and a first step is provided on the outer periphery of the cylindrical boss. The first step is provided with a first step surface. An annular boss is provided in the first inner cavity, and the annular boss can abut against the fourth boss.

[0014] In one embodiment of the present invention, one end of the pen body is provided with a through hole and a first groove, the button is installed in the through hole, the column body cooperates with the first groove, and the first stepped surface abuts against the third plane of the pen body.

[0015] In one embodiment of the present invention, the concealed needle assembly includes a concealed needle sleeve, a third elastic body, and a concealed needle cap. The two ends of the third elastic body abut against the concealed needle sleeve and the concealed needle cap, respectively. The concealed needle sleeve is connected to the pen refill holder, and the concealed needle cap is slidably connected to the concealed needle sleeve. A pen cap is fitted over the outside of the spiral sleeve.

[0016] In one embodiment of the present invention, before injection, the pen holder is rotated to cause the push rod to move the piston inside the cartridge, mixing the medication. Continuing to rotate the pen holder lifts the unlocking element, and the hook-shaped structure no longer abuts the first cantilever. During injection, pressing the button causes the first inclined surface to push the first cantilever outward, deforming it and disengaging the second slot from the first protrusion, thus unlocking the push rod. Under the push of the first elastic body, the push rod continues to move downward, pushing the piston inside the cartridge downward for medication injection. As the push rod moves downward, the third cantilever is squeezed outward by the second step. When the third cantilever passes the second step, it resets and strikes the outer surface of the push rod column, emitting a warning sound. The injection pen can then be pulled out. At this point, the fourth protrusion abuts against the second inclined surface.

[0017] The beneficial effects of this invention are: The present invention provides a dual-cavity automatic injection pen with unlocking and sound-emitting function, which has the following advantages: 1. The dual-chamber automatic injection pen with unlocking and sound function provided by this invention has a compact structure and small size, making it convenient for patients to carry around in various scenarios such as daily outings and at home. It can respond to injection needs at any time without the need to carry additional auxiliary tools. Its operation process is simplified, eliminating complicated operation steps, effectively reducing the burden on patients and lowering the probability of operation errors. It is especially suitable for elderly, disabled, and other patients with poor self-care abilities, improving their ease of use and autonomy, and enhancing treatment compliance.

[0018] 2. This dual-cavity automatic injection pen with unlocking and sound-emitting functions integrates these functions into a single component, significantly reducing the number of parts and simplifying the overall structure. This lowers the costs of mold development and material production, shortens assembly processes, and improves production efficiency. It also avoids the drawbacks of separate installation of the unlocking and sound-emitting components, solving problems such as high precision requirements, misalignment, and loosening during assembly. This ensures smooth unlocking, clear and accurate sound feedback, and eliminates abnormal noises and sound failures that affect the user experience.

[0019] 3. This dual-cavity automatic injection pen with unlocking and sound function achieves automatic injection by linking the pen core holder, unlocking component, push rod and button, utilizing the cantilever's ability to be squeezed and deformed and its own reset function. At the same time, the button can be limited by the fourth protrusion on the base to prevent repeated pressing and accidental injury. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view of the dual-chamber automatic injection pen provided by the present invention.

[0022] Figure 2 This is an exploded view of the dual-chamber automatic injection pen provided by the present invention.

[0023] Figure 3 This is a perspective view of the button provided by the present invention.

[0024] Figure 4 This is a cross-sectional view of the button provided by the present invention.

[0025] Figure 5 This is a three-dimensional view of the pen body provided by the present invention.

[0026] Figure 6 This is a three-dimensional view of the pen body provided by the present invention.

[0027] Figure 7 This is a perspective view of the base provided by the present invention.

[0028] Figure 8 This is a perspective view of the base provided by the present invention.

[0029] Figure 9 This is a perspective view of the push rod provided by the present invention.

[0030] Figure 10 This is a cross-sectional view of the push rod provided by the present invention.

[0031] Figure 11 This is a perspective view of the fixing base provided by the present invention.

[0032] Figure 12 This is a perspective view of the fixing base provided by the present invention.

[0033] Figure 13 This is a front view of the fixing base provided by the present invention.

[0034] Figure 14 This is a perspective view of the unlocking component provided by the present invention.

[0035] Figure 15 This is a cross-sectional view of the unlocking component provided by the present invention.

[0036] Figure 16 This is a cross-sectional view of the initial state of the dual-cavity pen provided by the present invention.

[0037] Figure 17 This is a cross-sectional view of the mixed state of the dual-chamber pen provided by the present invention.

[0038] Figure 18 This is a cross-sectional view of the dual-chamber pen in its exhaust state provided by the present invention.

[0039] Figure 19 This is a cross-sectional view of the dual-chamber pen injection state provided by the present invention.

[0040] In the picture: 1. Button; 101. Cylindrical boss; 102. First inner cavity; 103. First plane; 104. Second plane; 105. Column; 106. First step; 1061. First step surface; 107. First inclined surface; 108. Annular boss; 1081. Second inclined surface; 1082. Third inclined surface; 2. Pen body; 201. Outer wall; 202. Inner surface; 203. Annular end face; 204. Open end face; 205. Through hole; 206. First groove; 207. First slot; 208. Viewing window; 209. Third plane; 210. First reinforcing rib; 3. Base; 301. Base body; 302. Second inner cavity; 303. Fourth plane; 304. Fifth plane; 305. Second groove; 306. First boss; 3061. Surface of first boss; 307. Second boss; 308. Third boss; 3081. Fourth inclined surface; 309. Second reinforcing rib; 310. Limiting groove; 311. Cylindrical structure; 312. Fourth boss; 3121. Surface of fourth boss; 4. First elastic body; 5. Push rod; 501. Push rod cylinder; 502. Third inner cavity; 5021. Circular plane; 503. Sixth plane; 504. Seventh plane; 505. First cantilever; 506. Second slot; 507. Fifth inclined plane; 508. Second step; 509. Eighth plane; 6. Fixing base; 601. Outer surface; 602. Fourth inner cavity; 603. Ninth plane; 604. Tenth plane; 605. Fourth groove; 606. Fifth boss; 6061. Fifth boss plane; 607. Sixth boss; 608. Seventh boss; 609. Third slot; 610. Eighth boss; 7. Second elastic body; 8. Unlocking component; 801. Unlocking component body; 802. Fifth inner cavity; 803. Eleventh plane; 804. Twelfth plane; 805. Second cantilever; 8051. Hook-shaped structure; 806. Third groove; 8061. Sixth inclined surface; 807. Third step; 8071. Second step surface; 8072. Third step surface; 808. Third cantilever; 9. Spiral sleeve; 10. Pen refill holder; 11. Cartridge bottle; 12. Needle assembly; 13. Hidden needle sleeve; 14. Third elastomer; 15. Hidden needle cap; 16. Pen cap. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1 to 19As shown, this invention provides a dual-cavity automatic injection pen with an unlocking and sound-emitting function. The pen includes a button 1, a pen body 2, a base 3, a push rod 5, a fixing seat 6, and an unlocking component 8. The button 1 is mounted on one side of the pen body 2 and slidably connected to it. The fixing seat 6 is installed in the pen body 2 and fixedly connected to it. The base 3 is embedded in the fixing seat 6 and fixedly connected to it. The unlocking component 8 is embedded between the fixing seat 6 and the base 3, with its interior abutting against the base 3. A second elastic body 7 is sleeved around the outer periphery of the unlocking component 8, with both ends abutting against the unlocking component 8 and the fixing seat 6 respectively. The second elastic body 7 and the base 3 can limit the unlocking component 8, preventing it from moving along the axis of the base 3. The push rod 5 is embedded in the base 3, and a first elastic body 4 is installed inside it. Both ends of the first elastic body 4 abut against the push rod 5 and the base 3 respectively, providing a pushing force to the push rod 5. Initially, the first elastic body 4 is in a compressed state. The unlocking component 8 is fitted around the outer periphery of the push rod 5 and abuts against the push rod 5. The base 3 is detachably connected to the push rod 5. In the initial state, the base 3 and the unlocking component 8 can limit the push rod 5, preventing it from moving along the axis of the base 3. The bottom of the button 1 abuts against the push rod 5. Before the push rod 5 is unlocked, the button 1 cannot be pressed down, preventing accidental activation and potential injury.

[0043] In some embodiments, a spiral sleeve 9 is also installed inside the pen body 2. The spiral sleeve 9 is fitted over the unlocking member 8, and one end is connected to the fixing base 6 via a buckle. A pen refill holder 10 is provided at one end of the spiral sleeve 9. The spiral sleeve 9 and the pen refill holder 10 are connected by threads. By rotating the pen refill holder 10, the pen refill holder 10 can be moved along the axial direction of the spiral sleeve 9. A cartridge bottle 11 is installed inside the pen refill holder 10. The cartridge bottle 11 is a double-chamber cartridge bottle with two pistons inside, which can separate two kinds of drugs. The cartridge bottle 11 is fixed inside the pen refill holder 10. The push rod 5 can abut against the piston inside the cartridge bottle 11 and can push the piston inside the cartridge bottle 11 to move, so that the drugs in the cartridge bottle 11 flow from the channel to the bottom of the cartridge bottle for mixing. A needle assembly 12 is provided on the side of the cartridge bottle 11 opposite to the push rod 5. The needle assembly 12 includes a needle and other structures. One end of the needle is connected to the cartridge bottle 11, and the other end can be inserted into human skin for drug injection.

[0044] In some embodiments, the dual-chamber auto-injection pen with unlocking and sound-emitting function further includes a concealed needle assembly, which includes a concealed needle sleeve 13, a third elastomer 14, and a concealed needle cap 15, for concealing the needle assembly 12 to avoid secondary injury or cross-infection. The concealed needle sleeve 13 is fitted around the outer periphery of the pen refill holder 10 and the needle assembly 12 and is fixedly connected to the pen refill holder 10. The concealed needle cap 15 is installed inside the concealed needle sleeve 13 and is slidably connected to the concealed needle sleeve 13. The third elastomer 14 is embedded in the inner cavity of the concealed needle cap 15, with its two ends abutting against the concealed needle sleeve 13 and the concealed needle cap 15, respectively. When the concealed needle cap 15 is subjected to pressure, the third elastomer 14 will contract into the concealed needle sleeve 13, compressing the third elastomer 14 and exposing the needle assembly 12. When the injection is completed and no external pressure is applied to the concealed needle cap 15, the concealed needle cap 15 will reset under the action of the third elastomer 14, concealing the needle assembly 12. The dual-chamber automatic injection pen with unlocking and sound function is also equipped with a pen cap 16. The pen cap 16 is fitted around the outer periphery of the spiral sleeve 9 and is detachably connected to the spiral sleeve 9 by a snap fastener. The pen cap 16 can protect the needle assembly 12 and the hidden needle assembly, and can also cooperate with the pen body 2 to make the entire dual-chamber pen more aesthetically pleasing.

[0045] like Figure 2 , Figure 5 , Figure 6 and Figures 16 to 19 As shown, in some embodiments, the pen body 2 is a long, hollow cylindrical structure, including an outer wall 201 and an inner surface 202. Its upper end is provided with a non-circular annular end face 203. The annular end face 203 is provided with a thickened flange or rounded corner for transition, forming a rounded outer contour to avoid sharp edges, and also serving as a top assembly reference for the part. A circular through hole 205 is provided at the center of the annular end face 203, and a first groove 206 is provided inside the hole. The first groove 206 is a cylindrical groove structure. An array of first slots 207 are formed on the outer wall 201. The fixing seat 6 is axially fixed by engaging with the first slots 207. Several first reinforcing ribs 210 are provided in the inner surface 202, distributed along the axis of the pen body 2. The first reinforcing ribs 210 are fitted with the spiral sleeve 9 to achieve foolproof anti-fooling and axial positioning of the spiral sleeve 9. The pen body 2 has an open end face 204 on the side opposite to the annular end face 203. The open end face 204 has a beveled or rounded transition structure, forming an inwardly concave arc or beveled contour, which can cooperate with the spiral sleeve 9, optimizing the appearance of the dual-cavity pen. A viewing window 208 is also provided on the outer wall 201 for observing the different states of the pen refill holder 10 during the spiral ascent. A third plane 209 is also provided in the inner surface 202. The third plane 209 can abut against the button 1 to limit the button 1 and prevent the button 1 from coming out of the pen body 2.

[0046] like Figure 2 , Figure 11 , Figure 12 , Figure 13 and Figures 16 to 19 As shown, in some embodiments, the fixing seat 6 includes a sixth protrusion 607. The fixing seat 6 is divided into upper and lower parts along the central axis, separated by the annular sixth protrusion 607. The upper part is a through-type hollow structure, including an outer surface 601 and a fourth inner cavity 602. The outer contour is a multi-lobed spline or plum blossom shape, composed of multiple sets of planes and arc transitions, forming a circumferential concave-convex structure. At the same time, two symmetrical fourth grooves 605 are formed. The fourth grooves 605 are convex-shaped structures, which can limit the locking member 8. A ninth plane 603 is provided on one side of the fourth groove 605, and a tenth plane 604 is provided on the side of the fixing seat 6 opposite to the ninth plane 603. Several fifth protrusions 606 are provided in the fourth inner cavity 602. The fifth protrusions 606 are fan-shaped protrusions, extending a certain distance from the ninth plane 603 to the tenth plane 604. The fifth boss 606 has a fifth boss plane 6061, which can abut against the base 3 to axially limit the base 3. The sixth boss 607 has several seventh bosses 608, which can be inserted into the first slot 207 to fix the fixing seat 6 to the pen body 2. Their direction and number are adapted to the first slot 207. Several third slots 609 are provided on one side of the sixth boss 607, which can cooperate with the base 3 to fix the base 3. The fixing seat 6 also has an eighth boss 610, which is a T-shaped protrusion that can cooperate with the spiral sleeve 9 to achieve axial fixation of the spiral sleeve 9.

[0047] like Figure 2 , Figure 7 , Figure 8 and Figures 16 to 19As shown, in some embodiments, the base 3 includes a base body 301 and a second inner cavity 302. The base body 301 is an approximately square cylindrical structure, narrowing at the top into a cylindrical connecting structure and at the bottom into an open cylindrical opening, exhibiting an overall symmetrical structure. The second inner cavity 302 is located inside the base body 301 and is a hollow cylindrical structure used to accommodate the push rod 5. The base body 301 has a fourth plane 303 and a fifth plane 304 at its two ends, respectively. Extending upwards from the fourth plane 303 is a cylindrical structure 311 coaxial with the base body 301, whose diameter is smaller than that of the base body 301, forming a stepped transition structure. The cylindrical structure 311 has multiple grooves that can contract inwards when compressed by external force. The cylindrical structure 311 has several circumferentially evenly distributed fourth protrusions 312 on its outer periphery. Each fourth protrusion 312 includes a fourth protrusion surface 3121. There are four sets of fourth protrusions 312 arranged in a cross-shaped symmetrical pattern. Each set of protrusions is a rectangular protrusion. The fourth protrusion surface 3121 can abut against the button 1 to achieve circumferential positioning and axial limiting of the button 1. The base body 301 has multiple sets of second protrusions 307 on its outer periphery. The second protrusions 307 can cooperate with the third slot 609 of the fixing seat 6 to fix the base 3 to the fixing seat 6. The base body 301 has a circular protrusion at its center. The second inner cavity 302 has a second reinforcing rib 309. The second reinforcing rib 309 is centered on the center of the circular protrusion, and multiple ribs are evenly distributed on the circular protrusion, dividing the interior into multiple fan-shaped cavities. A limiting groove 310 is provided on the rib of the second reinforcing rib 309, and one side of the first elastic body 4 is embedded in the limiting groove 310 to position the first elastic body 4 axially and circumferentially.

[0048] In some embodiments, the base body 301 is provided with a second groove 305 and a first boss 306. The first boss 306 is disposed on a circular boss, and the second groove 305 is located below the first boss 306. The side of the first boss 306 opposite to the second groove 305 is provided with a first boss surface 3061. The push rod 5 abuts against the first boss 306, which can axially fix the push rod 5. A third boss 308 is provided on the outer side of the base body 301 near the fifth plane 301. The third boss 308 is provided with a fourth inclined surface 3081, which can abut against the unlocking member 8 to achieve axial limiting of the unlocking member 8.

[0049] like Figure 2 , Figure 9 , Figure 10 and Figures 16 to 19As shown, in some embodiments, the push rod 5 is an integral structure in the shape of a slender rod, and is divided into three parts along its axis: a head connection section, a middle transition section, and a main body section. The head connection section includes a push rod column 501, which has a third inner cavity 502. A circular plane 5021 is formed at the connection between the push rod column 501 and the middle transition section. A first elastic body 4 is embedded in the third inner cavity 502, and one end of the first elastic body 4 abuts against the circular plane 5021. The diameter of the first elastic body 4 is smaller than the inner diameter of the third inner cavity 502. A sixth plane 503 is provided on one side of the head connection section, and a seventh plane 504 is provided on the side of the main body section opposite to the head connection section. Starting from the sixth plane 503, the plane extends upward by a certain distance to form two mutually symmetrical first cantilever 505. A second slot 506 is provided on the first cantilever 505. The second slot 506 is through-hole and cooperates with the first boss 306, abutting against the surface 3061 of the first boss. A fifth inclined surface 507 is provided on the side of the first cantilever 505 away from the sixth plane 503. The fifth inclined surface 507 abuts against the button 1 and is used to fix the button 1 and release the push rod 5. A second step 508 is provided on the middle transition section. The second step 508 consists of two symmetrical steps surrounding the outer periphery of the push rod column 501. An eighth plane 509 is provided on one side of the second step 508.

[0050] like Figure 2 , Figures 14 to 19As shown, in some embodiments, the unlocking component 8 is an axisymmetric cylindrical structure, including an unlocking component body 801 and a fifth inner cavity 802. The unlocking component body 801 has an eleventh plane 803 and a twelfth plane 804 at its two ends. Taking the eleventh plane 803 as the starting surface, two symmetrical elongated second cantilever arms 805 extend in a direction away from the second outer surface 801. The top of each second cantilever arm 805 has an inwardly bent L-shaped hook structure 8051, forming an inwardly limiting claw. The hook structure 8051 abuts against the first cantilever arm 505, restricting the outward deformation of the first cantilever arm 505, and cooperates with the base 3 to restrict the movement of the push rod 5. One side of the unlocking component body 801 has an integrally formed outwardly protruding third step 807, the outer diameter of which is larger than the outer diameter of the unlocking component body 801. The third step 807 includes a second step surface 8071 and a third step surface 8072. The second step surface 8071 abuts against the second elastic body 7, and the third step surface 8072 cooperates with the spiral sleeve 9 to achieve axial positioning of the unlocking component 8. A third groove 806 is provided inside the unlocking component 8, located within the fifth inner cavity 802. The third groove 806 consists of two symmetrical cylindrical grooves, with their end faces forming a sixth inclined surface 8061. The sixth inclined surface 8061 abuts against the fourth inclined surface 3081 of the base 3, axially limiting the unlocking component 8. Two symmetrical third cantilever arms 808 are also provided on both sides of the unlocking component body 801. The third cantilever arms 808 retract into the fifth inner cavity 802, abutting against the push rod 5. An audible signal is emitted by striking the push rod column 501, indicating that the injection is complete. During the sound-generating process where the unlocking component 8 strikes the push rod column 501 via the third cantilever 808, the third cantilever 808 rebounds due to elastic deformation to strike the push rod 5. The impact force is determined by the cantilever wall thickness, length, and elastic modulus, and these variables are controllable. Compared with the existing technology where sound is generated by the impact of the sound-generating component with the base, this method ensures that the volume of the emitted prompt sound is not affected by assembly gaps or wear, guaranteeing stable sound generation. Moreover, it has lower requirements for assembly coaxiality and assembly gaps; even minor deviations will not affect sound generation. Simultaneously, the elastic cantilever does not experience instantaneous rigid impact during rebound, preventing severe vibrations to the push rod, medicine bottle, and other structures. The vibration amplitude is small, resulting in no noticeable vibration when held, ensuring stability during the injection process.

[0051] like Figure 2 , Figure 3 , Figure 4 and Figures 16 to 19As shown, in some embodiments, button 1 includes a cylindrical boss 101, one end of which is provided with a disc-shaped structure, the surface of which is a first plane 103. The cylindrical boss 101 has a first inner cavity 102, which is a hollow structure. A second plane 104 is provided on the side of the cylindrical boss 101 facing away from the first plane 103. Several columns 105 of a certain width are provided on the side of the cylindrical boss 101 perpendicular to the second plane 104. The columns 105 can cooperate with the first groove 206 to provide guidance for the installation of button 1 and pen body 2. A first step 106 is provided on the outer side of the end of the cylindrical boss 101 near the second plane 104. The first step 106 consists of two discontinuous wedge-shaped steps that rotate around the cylindrical boss 101 at a certain angle. The first step 106 has a first step surface 1061 on the side facing away from the second plane 104. The first step surface 1061 can abut against the third plane 209 to limit the axial movement of the button 1. The button 1 has a first inclined surface 107 on the side close to the second plane 104. In the initial state, the first inclined surface 107 abuts against the fifth inclined surface 507 to limit the button 1, preventing the button 1 from being pressed down. An annular boss 108 is provided in the first inner cavity 102. The annular boss 108 includes a second inclined surface 1081 and a third inclined surface 1082, which are located on both sides of the annular boss 108. When button 1 is fully pressed, the third inclined surface 1082 abuts against the cylindrical structure 311, pushing the cylindrical structure 311 to deform inward, thereby causing the annular boss 108 to move below the fourth boss 312. At this time, the fourth boss 312 abuts against the second inclined surface 1081, limiting button 1 and preventing button 1 from being pressed repeatedly.

[0052] Optionally, the first elastic body 4, the second elastic body 7, and the third elastic body 14 are all springs.

[0053] Working principle of the invention: 1. Pen Body Installation: Insert the first elastic body 4 into the third inner cavity 502 of the push rod 5, then pass the first cantilever 505 of the push rod 5 through the second groove 305, and embed the first boss 306 into the second hole 506. At this time, the two ends of the first elastic body 4 abut against the annular plane 5021 and the limiting groove 310 respectively, and the first elastic body 4 is in a compressed state. Slide the unlocking piece 8 onto the outer periphery of the base 3 from the direction of the cylindrical structure 311, and make the fourth inclined surface 3081 abut against the sixth inclined surface 8061. The hook-shaped structure 8051 of the second cantilever 805 abuts against the first cantilever 505 to prevent the first boss 306 from coming out of the second hole 506. The second elastic body 7 is fitted onto the outer periphery of the unlocking member 8, and the fixing seat 6 is fitted onto the outer periphery of the unlocking member 8. The second protrusion 307 is embedded in the third groove 609, fixing the fixing seat 6 to the base 3. At this time, the second elastic body 7 abuts against the second step surface 8071 and the tenth plane 604 respectively. Through the cooperation between the second elastic body 7 and the base 3, the axial direction of the unlocking member 8 is limited. The spiral sleeve 9 is snapped onto the eighth protrusion 610 of the fixing seat 6, and then the pen body 2 is fitted onto the outer periphery of the fixing seat 6, and the seventh protrusion 608 is snapped into the first groove 207, fixing the pen body 2 to the fixing seat 6. The button 1 is inserted into the through hole 205 along the first groove 206, and the third plane 209 abuts against the first step surface 1061.

[0054] 2. Installation of the hidden needle assembly: Insert the cartridge 11 into the pen refill holder 10, install the pen refill holder 10 into the spiral sleeve 9, and install the needle assembly 12, hidden needle sleeve 13, third elastomer 14 and hidden needle cap 15 onto the pen refill holder 10 in sequence. Finally, put the pen cap 16 on the outer periphery of the spiral sleeve 9.

[0055] 3. Preparation Process: In the initial state, all components are relatively stationary. Pressing button 1 causes the first cantilever 505 to remain stationary under the constraint of the second cantilever 805. During use, the user holds the pen body 2 with one hand and the pen cartridge holder 10 with the other, rotating it upwards. The push rod 5 pushes the piston inside the cartridge 11 downwards, mixing the medication. To ensure even mixing, the pen can also be shaken repeatedly with both hands. Continuing to rotate the pen cartridge holder 10 upwards pushes the unlocking mechanism 8 upwards. At this point, the hook structure 8051 moves above the first cantilever 505 and no longer contacts it. Gas in the cartridge 11 is discharged through the needle assembly 12 until a small amount of liquid is discharged from the needle assembly 12.

[0056] 4. Injection Process: Pressing button 1 causes the first inclined surface 107 of button 1 to push the first cantilever 505 outward, thereby disengaging the second slot 506 from the first protrusion 306 and unlocking the push rod 5. At this time, under the pushing force of the first elastic body 4, the push rod 5 pushes the piston inside the cartridge 11 downward to inject the medication. As the push rod 5 pushes downward, the third cantilever 808 is squeezed outward by the second step 508 of the push rod 5. When the third cantilever 808 passes the second step 508, it resets and strikes the outer surface of the push rod column 501, emitting a beep to indicate that the injection is complete. The user can then remove the injection pen. The second inclined surface 1081 of button 1 abuts against the fourth protrusion 312 of the base 3, limiting the button 1 and preventing repeated pressing that could cause accidental injury.

[0057] The dual-cavity automatic injection pen with unlocking and sound-emitting function provided by this invention has a compact structure and small size, making it convenient for patients to carry and administer injections at any time. Its simple operation reduces the burden on patients, making it particularly suitable for patients with limited self-care abilities. This dual-cavity automatic injection pen integrates unlocking and sound-emitting functions into a single component, reducing the number of parts, simplifying the structure, lowering mold development and material production costs, and simplifying the assembly process, thus improving production efficiency. It avoids the problems associated with separate installation of the unlocking and sound-emitting components, which require high precision and are prone to misalignment, jamming, loosening, resulting in unsmooth unlocking, malfunctioning sound feedback, or abnormal noises.

[0058] Furthermore, by adjusting the dual-chamber automatic injection pen with unlocking and sound-activated function to the dispensing state, pressing button 1 will trigger a series of actions involving the push rod 5, the first elastic body 4, and the unlocking component 8, causing the unlocking component 8 to unlock the push rod 5. Under the push of the first elastic body 4, the push rod 5 pushes the piston inside the cartridge 11 downwards to inject medication, achieving automatic drug injection. This is beneficial for elderly, disabled, and other patients with limited self-care abilities.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A dual-chamber automatic injection pen with unlocking and sound-emitting function, characterized in that, include: Pen body (2); The fixing base (6) is fixedly connected to the pen body (2); The base (3) is embedded in the fixed seat (6) and connected to the fixed seat (6); The unlocking component (8) is embedded between the fixing seat (6) and the base (3) and abuts against the base (3); The second elastic body (7) is sleeved on the outer periphery of the unlocking member (8), and its two ends abut against the unlocking member (8) and the fixing seat (6) respectively; Push rod (5), the push rod (5) is embedded in the base (3) and abuts against the base (3), the unlocking member (8) abuts against the push rod (5); The first elastic body (4) is embedded in the push rod (5), and its two ends abut against the base (3) and the push rod (5) respectively. Button (1) is slidably connected to the pen body (2), and one end abuts against the push rod (5); The spiral sleeve (9) is connected to the fixed base (6) and has a pen refill holder (10) and a cartridge bottle (11) installed inside. A needle assembly (12) and a hidden needle assembly are installed on one side of the pen refill holder (10).

2. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 1, characterized in that, The unlocking component (8) includes a second cantilever (805) and a third cantilever (808). One end of the second cantilever (805) is provided with a hook-shaped structure (8051), which abuts against the push rod (5). The third cantilever (808) retracts towards the center of the unlocking component (8), abuts against the push rod (5), and strikes the push rod (5) to emit a prompt sound.

3. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 2, characterized in that, The push rod (5) includes a push rod column (501), a first cantilever (505) is provided on one side of the push rod column (501), a second slot (506) is provided on the first cantilever (505), the hook structure (8051) abuts against the first cantilever (505), the second slot (506) cooperates with the base (3) to connect the push rod (5) with the base (3); a fifth inclined surface (507) is provided at one end of the first cantilever (505), the fifth inclined surface (507) abuts against the first inclined surface (107) of the button (1).

4. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 3, characterized in that, The base (3) is provided with a second groove (305), a first boss (306) and a third boss (308). The first cantilever (505) passes through the second groove (305) so that the second hole (506) is engaged with the first boss (306). The unlocking member (8) includes a third groove (806). One end of the third groove (806) is provided with a sixth inclined surface (8061). The sixth inclined surface (8061) abuts against the fourth inclined surface (3081) of the third boss (308).

5. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 2, characterized in that, The push rod (5) includes a second step (508) which can abut against the third cantilever (808) and can squeeze the third cantilever (808) to deform it. The seventh plane (504) of the push rod (5) abuts against the piston of the cartridge bottle (11).

6. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 1, characterized in that, The base (3) includes a second protrusion (307), and the fixing seat (6) includes a seventh protrusion (608) and a third slot (609). The second protrusion (307) is engaged with the third slot (609) to connect the fixing seat (6) to the base (3). The pen body (2) has a first slot (207). The seventh protrusion (608) is engaged with the first slot (207) to connect the fixing seat (6) to the pen body (2). The direction and number of the seventh protrusion (608) are adapted to the direction and number of the first slot (207).

7. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 1, characterized in that, The button (1) includes a cylindrical boss (101) and a first inner cavity (102). At least one column (105) is provided on the cylindrical boss (101). A first step (106) is provided on the outer periphery of the cylindrical boss (101). A first step surface (1061) is provided on the first step (106). An annular boss (108) is provided in the first inner cavity (102). The annular boss (108) can abut against the fourth boss (312).

8. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 7, characterized in that, The pen body (2) has a through hole (205) and a first groove (206) at one end. The button (1) is installed in the through hole (205). The column (105) cooperates with the first groove (206). The first stepped surface (1061) abuts against the third plane (209) of the pen body (2).

9. The dual-cavity automatic injection pen with unlocking and sound-emitting function according to claim 1, characterized in that, The concealed needle assembly includes a concealed needle sleeve (13), a third elastic body (14), and a concealed needle cap (15). The two ends of the third elastic body (14) abut against the concealed needle sleeve (13) and the concealed needle cap (15) respectively. The concealed needle sleeve (13) is connected to the pen refill holder (10). The concealed needle cap (15) is slidably connected to the concealed needle sleeve (13). A pen cap (16) is fitted on the outside of the spiral sleeve (9).

10. The dual-chamber automatic injection pen with unlocking and sound-emitting function according to any one of claims 1-9, characterized in that, Before injection, by rotating the pen holder (10), the push rod (5) pushes the piston inside the cartridge (11) to mix the medicine. Continuing to rotate the pen holder (10) lifts the unlocking member (8), and the hook structure (8051) no longer abuts the first cantilever (505). During injection, pressing the button (1) causes the first inclined surface (107) to push the first cantilever (505) downwards, deforming it outwards and disengaging the second slot (506) from the first boss (306), thus unlocking the push rod (5). In the first spring... Under the push of the sex body (4), the push rod (5) continues to move down, pushing the piston in the cartridge (11) to move down and inject the medicine. As the push rod (5) moves down, the third cantilever (808) is squeezed outward by the second step (508). When the third cantilever (808) passes the second step (508), the third cantilever (808) returns to its original position and strikes the outer surface of the push rod column (501), making a prompt sound. The injection pen can then be pulled out. At this time, the fourth boss (312) abuts against the second inclined surface (1081).

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