Dual chamber structure automatic injection pen

Abstract

The application discloses a double-cavity structure automatic injection pen and belongs to the technical field of medical devices. The double-cavity structure automatic injection pen comprises a shell, a cartridge holder, a double-cavity cartridge, a push rod, a base, an unlocking part, a releasing part, an injection spring and a button. The push rod is provided with a first hook hole, the base is provided with a first hook matched with the first hook hole, the base is further provided with a second hook hole, and the unlocking part is provided with a second hook matched with the second hook hole. The unlocking part is used for keeping or releasing the cooperation of the first hook hole and the first hook. The releasing part is used for keeping or releasing the cooperation of the second hook hole and the second hook, so that the button cannot be pressed before the releasing part releases the second hook hole and the second hook, and the unlocking part cannot slide by pressing the button. The double-cavity structure automatic injection pen can guarantee that the double-cavity liquid medicine cannot be triggered before being mixed, has simple operation, high stability, and is convenient for patients to safely inject.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a double-cavity automatic injection pen for drug injection. BACKGROUND

[0002] Automatic injectors reduce the difficulty of injection treatment and reduce the pain of patients, and are welcomed by many medical workers and patients. However, most of the automatic injectors on the market are single-cavity injectors. For some treatment plans that require combined medication, for example, some drugs need to be mixed with agents such as powders, freeze-dried liquid medicine and diluent. At this time, single cavity cannot operate and needs to be stored in double cavity. Although some double-cavity injectors can accommodate two drugs, such as a drug delivery device disclosed in Chinese Patent No. CN113164694B, which includes: a housing having a proximal end and a distal end; a multi-chamber container arranged within the housing; a power assembly having accumulated energy, the power assembly being arranged within the housing and configured to act on the multi-chamber container for obtaining a mixed compound within the multi-chamber container and delivering the mixed compound; a manually operable assembly extending from the distal end of the housing and connected to the power assembly, wherein upon manually moving the manually operable assembly, the power assembly is forced to move proximally, thereby pressurizing the multi-chamber container; wherein the drug delivery device further comprises a needle shield sleeve slidably arranged within the housing, the needle shield sleeve being configured to interact with the power assembly to release the accumulated energy after the power assembly moves proximally. This scheme is also a manual rotation mixing of liquid medicine, but does not set a safety mechanism to prevent triggering before the liquid medicine is completely mixed, so that the scheme lacks the accuracy of mixing liquid medicine and the safety of the overall injection pen, and the structure is complex, and there is no sound structure after injection.

[0003] In addition, a Chinese utility model patent with the publication number CN222195644U discloses a double-chamber syringe assembly and an automatic injection pen. The double-chamber syringe assembly comprises a syringe barrel, a middle plug and a rear plug. One end of the syringe barrel is provided with an opening, and the other end is provided with a syringe needle head in communication with the inside of the syringe barrel. The side of the middle plug is in movable abutment with the inner wall of the syringe needle head, and the middle plug and the syringe needle head have a front chamber therebetween. The inner wall of the syringe barrel is provided with a liquid injection channel in communication with the syringe needle head. The length of the liquid injection channel is greater than the length of the middle plug. The side of the rear plug is in movable abutment with the inner wall of the syringe needle head, and the rear plug and the middle plug have a rear chamber therebetween. By providing the liquid injection channel on the inner wall of the syringe barrel, the liquid injection channel is in communication with the rear chamber, and the second liquid in the rear chamber is injected out together until the end surface of the rear plug abuts against the middle plug. Only one injection can complete the injection of two incompatible drugs. However, the scheme is difficult to accurately control the dose of each drug during injection, which is easy to cause drug overdose or deficiency, and the scheme does not provide a safety mechanism to prevent triggering and a sound mechanism after injection. SUMMARY

[0004] To solve the problems in the above background art, the present scheme provides a double-chamber structure automatic injection pen with simple operation, compact structure, high stability, prevention of accidental triggering and provision of a sound mechanism after injection, which is convenient for patients to use.

[0005] The technical scheme adopted by the present application to solve its technical problems is as follows: a double-chamber structure automatic injection pen, comprising a shell, a cartridge holder, a double-chamber cartridge, a push rod, a base, an unlocking piece, a releasing piece, an injection spring and a button. The double-chamber cartridge is provided with an upper plug and a lower plug. The cartridge holder is provided with a cartridge holder inner cavity in which the double-chamber cartridge is installed. The cartridge holder is provided with an external thread. The shell is provided with an internal thread matched with the external thread. The cartridge holder is in rotational connection with the shell. In the process of rotating the cartridge holder upward relative to the shell, the push rod is in abutment with the upper plug of the double-chamber cartridge, so that the two drugs in the double-chamber cartridge are mixed. The push rod is provided with a first hook hole. The base is provided with a first clamping hook matched with the first hook hole. The base is further provided with a second hook hole. The unlocking piece is provided with a second clamping hook matched with the second hook hole. The unlocking piece is slidably sleeved outside the base, so as to keep or release the first hook hole and the first clamping hook. After the first hook hole and the first clamping hook are released, the push rod is released. The injection spring pushes the push rod to inject the mixed drugs downward. The releasing piece is sleeved outside the unlocking piece, so as to keep or release the second hook hole and the second clamping hook. Before the second hook hole and the second clamping hook are released, the button is in a locked state. The unlocking piece cannot slide by pressing the button, so as to prevent the push rod from being released.

[0006] Further, the pen core frame is provided with a first anti-reverse buckle, a second anti-reverse buckle and a third anti-reverse buckle, which are sequentially arranged at different heights of the outer wall of the pen core frame from top to bottom, and the shell is provided with anti-reverse buckle grooves matched with the first anti-reverse buckle, the second anti-reverse buckle and the third anti-reverse buckle, when the pen core frame rotates upward relative to the shell, the first anti-reverse buckle, the second anti-reverse buckle and the third anti-reverse buckle are sequentially buckled into the anti-reverse buckle grooves.

[0007] Further, when the first anti-reverse buckle is buckled into the anti-reverse buckle groove, the push rod abuts against the upper plug of the double-cavity cartridge bottle, the first hook hole and the first hook remain buckled, and the second hook hole and the second hook remain buckled.

[0008] Further, when the second anti-reverse buckle is buckled into the anti-reverse buckle groove, the upper plug and the lower plug abut against each other.

[0009] Further, when the third anti-reverse buckle is buckled into the anti-reverse buckle groove, the release member has been lifted by the pen core frame for a distance, and the release member releases the second hook hole and the second hook.

[0010] Further, when the release member releases the second hook hole and the second hook, the second hook of the unlocking member is still subjected to the force of the release member and the force of the second hook hole, thereby remaining stationary in the axial direction.

[0011] Further, the pen core frame is further provided with a letter mark, and the shell is provided with a viewing window matched with the letter mark, when the pen core frame rotates to a certain stage, the corresponding letter will be displayed on the viewing window, thereby giving people an intuitive visual feeling to remind the user of the state of the pen core frame.

[0012] Further, the pen also comprises a hidden needle sleeve and a hidden needle cap, the hidden needle sleeve is installed at the lower end of the pen core frame, the hidden needle cap is sleeved at the lower end of the hidden needle sleeve and is movably connected with the hidden needle sleeve, a hidden needle spring is further installed in the hidden needle sleeve and abuts against the hidden needle cap, and the hidden needle cap can shield the needle head to reduce the discomfort of the patient during injection.

[0013] Further, the pen also comprises a pen cap, which is sleeved on the hidden needle sleeve and is detachably connected with the hidden needle sleeve.

[0014] Further, the lower end of the button is provided with a protruding column, the unlocking columnar structure matched with the protruding column is arranged on the unlocking member, when the button is pressed, the protruding column abuts against the unlocking columnar structure, so that the unlocking member slides downward.

[0015] Further, the button is provided with a button wedge-shaped catch, the cap is provided with an upper cap groove and a lower cap groove matched with the button wedge-shaped catch, the button wedge-shaped catch is clamped into the upper cap groove before the button is pressed, and the button wedge-shaped catch is clamped into the lower cap groove after the button is pressed, so that the button cannot return to the position before being pressed.

[0016] Further, the injection pen further comprises a sound producing member and a sound producing spring, the push rod is provided with a first columnar structure, the bottom of the first columnar structure is provided with an upper radial inclined surface, the base is provided with a base sliding groove and a collision protrusion, the sound producing member is provided with a second columnar structure matched with the first columnar structure, the top of the second columnar structure is provided with a lower radial inclined surface, the sound producing member is movably sleeved on the base, and the sound producing spring upwardly abuts against the sound producing member; in the initial stage of downward injection of the push rod, the first columnar structure and the second columnar structure are pushed downward in the base sliding groove, in the final stage of injection, the second columnar structure is separated from the constraint of the base sliding groove, and the first columnar structure still remains in the base sliding groove, due to the inclined surface arrangement of the first columnar structure and the second columnar structure, the sound producing member generates rotation in the radial direction, and after the first columnar structure and the second columnar structure are completely separated, the sound producing spring abuts against the sound producing member to collide with the collision protrusion, so as to soundly prompt the completion of injection.

[0017] The injection pen has the advantages that the injection pen is small in size, compact in structure, simple in operation, and smooth in sound production after separation of the inclined surfaces, and the structure is simple, the cost is saved, and the realization is easy, the multiple safety protection devices effectively avoid the occurrence of accidental injuries, and the safety is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A front view of the injection pen provided by the present application;

[0019] Figure 2 An exploded view of the structure of the injection pen provided by the present application;

[0020] Figure 3a A perspective view of the button provided by the present application;

[0021] Figure 3b A sectional view of the button provided by the present application;

[0022] Figure 4a A perspective view of the cap provided by the present application;

[0023] Figure 4b A sectional view of the cap provided by the present application;

[0024] Figure 5Front view of the injection spring holder of the present invention;

[0025] Figure 6 Perspective view of the injection spring of the present invention;

[0026] Figure 7a Front view of the push rod of the present invention;

[0027] Figure 7b Sectional view of the push rod of the present invention;

[0028] Figure 8a Front view of the base provided by the present invention;

[0029] Figure 8b Sectional view of the base provided by the present invention;

[0030] Figure 9 Perspective view of the sound producing member provided by the present invention;

[0031] Figure 10 Perspective view of the sound producing spring provided by the present invention;

[0032] Figure 11 Perspective view of the needle hiding spring provided by the present invention;

[0033] Figure 12a Perspective view of the unlocking member provided by the present invention;

[0034] Figure 12b Sectional view of the unlocking member provided by the present invention;

[0035] Figure 13a Perspective view of the releasing member provided by the present invention;

[0036] Figure 13b Perspective view of the releasing member provided by the present invention from another angle;

[0037] Figure 14a Half sectional view of the housing provided by the present invention;

[0038] Figure 14b Sectional view of the housing provided by the present invention;

[0039] Figure 15a Perspective view of the refill holder provided by the present invention;

[0040] Figure 15b Sectional view of the refill holder provided by the present invention;

[0041] Figure 16 Sectional view of the needle hiding sleeve provided by the present invention;

[0042] Figure 17 Perspective view of the needle hiding cap provided by the present invention;

[0043] Figure 18 A cross-sectional view of the cap provided by the present application;

[0044] Figure 19 A cross-sectional view of the dual-chambered canister provided by the present application;

[0045] Figure 20 A front view of the fixing member provided by the present application;

[0046] Figure 21 A perspective view of the release spring provided by the present application;

[0047] Figure 22 A schematic view of the initial state structure of the present application;

[0048] Figure 23 A schematic view of the mixed state structure of the present application;

[0049] Figure 24 A schematic view of the exhaust state structure of the present application;

[0050] Figure 25 A schematic view of the injection state structure of the present application;

[0051] In the figure: 1, button; 101, first circular annular outer surface; 102, first circular annular inner cavity; 103, first circular planar structure; 104, bottom surface structure; 105, convex ring; 106, convex column; 106a, first structure; 107, button wedge-shaped catch; 107a, first upper inclined plane; 107b, lower inclined plane structure;

[0052] 2, gland; 201, first outer surface; 202, first inner cavity surface; 203, first circular annular plane; 204, first step; 205, second circular annular plane; 206, first inner cavity; 206a, first inner cavity bottom surface; 207, counterbore; 208, gland guide column; 209, gland guide groove; 210, gland catch; 211, first through groove; 212, second inner cavity; 212a, second inner cavity bottom surface; 215, opening; 216, intermediate spacer layer; 216a, second upper inclined plane; 216b, lower inclined plane;

[0053] 3, injection spring support; 301, second circular planar structure; 302, circular structure; 303, rod body;

[0054] 4, injection spring; 401, spring top end; 402, spring bottom end;

[0055] 5, push rod; 501, push rod outer surface; 502, spring cavity; 502a, spring cavity bottom surface; 503, first circular annular planar structure; 504, third circular planar structure; 505, first columnar structure; 506, upper radial inclined surface; 507, first hook hole;

[0056] 6, base; 601, upper end outer surface; 602, upper end inner cavity surface; 603, lower end outer surface; 604, lower end inner cavity surface; 605, upper end annular planar structure; 606, second step; 607, lower end annular planar structure; 608, upper end inner cavity bottom surface; 609, base mounting buckle; 610, base sliding slot; 611, collision protrusion; 612, first hook; 613, second hook hole; 614, second through slot; 615, base guide column;

[0057] 7, sound production piece; 701, first annular outer surface structure; 702, first annular inner cavity structure; 703, upper circular planar structure; 704, first lower annular planar structure; 705, second columnar structure; 706, lower radial inclined surface; 707, first groove; 708, second groove;

[0058] 8, sound production spring; 801, sound production spring upper end structure; 802, sound production spring lower end structure;

[0059] 9, unlocking piece; 901, second annular outer surface; 902, second annular inner cavity; 903, first upper annular planar structure; 904, second lower annular planar structure; 905, unlocking protruding column; 905a, termination planar structure; 906, head columnar structure; 906a, columnar structure planar surface; 907, unlocking opening; 908, second hook; 909, inner cavity structure; 909a, first step surface; 910, wedge-shaped step; 910a, upper step surface; 910b, side step surface;

[0060] 10, release piece; 1001, second annular outer surface structure; 1002, second annular inner cavity structure; 1003, second annular planar structure; 1004, third annular planar structure; 1005, protruding ring structure; 1005a, upper end surface; 1006, release piece guide column; 1008, release piece buckle structure; 1008a, end surface; 1009, protruding block structure; 1009a, planar surface; 1009b, second structure; 1010, release columnar structure; 1010a, inclined surface columnar structure;

[0061] 11, outer shell; 1101, outer shell annular outer surface; 1102, outer shell annular inner cavity; 1103, second upper annular planar structure; 1104, third lower annular planar structure; 1105, mounting hole; 1106, sliding slot; 1107, inner screw thread; 1108, anti-reverse buckle slot; 1109, window; 1110, anti-slip protruding block;

[0062] 12, refill holder; 1201, refill holder outer circular surface; 1202, refill holder inner cavity; 1203, third upper circular planar structure; 1204, fourth lower circular planar structure; 1205, annular step surface; 1205a, upper circular planar surface; 1205b, lower circular planar surface; 1206, external thread; 1207a, first anti-reverse buckle; 1207b, second anti-reverse buckle; 1207c, third anti-reverse buckle; 1208, cap buckle platform; 1209, medicine bottle buckle; 1210, first columnar structure; 1211, circular step surface; 1212, annular clamping groove; 1213, wedge-shaped locking block;

[0063] 13, double-cavity cassette bottle; 1301, third inner cavity; 1302, upper plug; 1303, lower plug; 1304, passage;

[0064] 14, needle assembly;

[0065] 15, needle cover; 1501, needle cover outer circular surface; 1502, needle cover inner circular cavity; 1503, needle cover upper circular planar structure; 1504, needle cover lower circular planar structure; 1505, circular step; 1505a, circular inclined plane; 1505b, third circular planar surface; 1506, second columnar structure; 1507, needle mounting groove; 1508, second step surface;

[0066] 16, needle spring; 1601, spring top end structure; 1602, spring bottom end structure;

[0067] 17, needle cap; 1701, needle cap outer circular surface; 1702, needle cap inner circular cavity; 1703, fifth circular planar structure; 1704, fourth circular planar structure; 1705, mounting sliding block;

[0068] 18, cap; 1801, cap outer circular surface; 1802, cap inner circular cavity; 1803, fourth circular planar structure; 1804, circular recess;

[0069] 19, release spring; 1901, release spring upper end structure; 1902, release spring lower end structure;

[0070] 20, fixing member; 2001, second outer surface; 2002, second inner cavity surface; 2003, fourth circular planar surface; 2004, annular platform; 2005, fifth circular planar surface; 2006, guide column; 2007, columnar groove; 2008, third structure. DETAILED DESCRIPTION

[0071] The present invention will be further described below with reference to the accompanying drawings. In this application, when the terms "upper end" or "up" are used, it refers to the button direction; correspondingly, when "lower end" or "lower" is used, it refers to the direction towards the needle tip. It is worth noting that these specific embodiments are merely representative specific embodiments of the present invention, and the specific methods, devices, conditions, materials, etc., exemplified are not intended to limit the present invention or the corresponding specific embodiments.

[0072] Dual-chamber automated injection pen, such as Figures 1-25 As shown, the device includes a housing 11, an injection assembly, a refill holder 12, a dual-chamber cartridge bottle 13, a hidden needle assembly, and a pen cap 18. The injection assembly is formed by assembling a button 1, a pressure cap 2, a fixing member 20, an injection spring bracket 3, an injection spring 4, a push rod 5, a base 6, a sound-emitting member 7, a sound-emitting spring 8, an unlocking member 9, a release member 10, and a release spring 19. The hidden needle assembly is formed by assembling a hidden needle sleeve 15, a hidden needle spring 16, and a hidden needle cap 17. The injection assembly is installed inside the housing 11. The dual-chamber cartridge bottle 13 is provided with an upper stopper 1302 and a lower stopper 1303. The refill holder 12 has an inner cavity for installing the dual-chamber cartridge bottle 13. The dual-chamber cartridge bottle 13 is installed inside the refill holder 12. The lower end of the dual-chamber cartridge bottle 13 is provided with a needle assembly 14. The pen refill holder 12 is rotatably connected to the outer shell 11 via an internal thread. When the pen refill holder 12 rotates upward, the injection assembly can abut against the dual-chamber cartridge bottle 13, causing the liquid medicine and powder medicine between the upper stopper 1302 and the lower stopper 1303 inside the dual-chamber cartridge bottle 13 to mix.

[0073] like Figure 3a and Figure 3bAs shown, in some embodiments, the button 1 is a hollow and one end open cylindrical structure, provided with a first circular ring outer surface 101 and a first circular ring inner cavity 102. The upper end of the button 1 is a first circular flat structure 103, which is convenient for pressing to release the unlocking and injection; the lower end of the button 1 is open in direction, forming a circular ring type plane, which is also the stop position after pressing. The convex ring 105 is a circular ring structure attached to the outer surface, the starting plane is the lower end, and extends a certain distance to the upper end, forming a circular ring type buckle, which cooperates with the gland 2, is used for fixing the button 1, and prevents the button 1 from falling off under the action of no force. The lower end of the button 1 extends two symmetrical convex columns 106 with a certain length, the convex column 106 is in the shape of a crescent, the first structure 106a is the terminal plane of the convex column 106; the two sides of the convex column 106 are in the shape of a plane, and the width needs to be less than one fourth of the circular arc of the body, so as to be inserted into the gland 2 for linear motion; a rectangular through slot is further provided on the outer surface of the convex column 106, which has a certain distance from the terminal plane, and the rectangular bottom surface is used as the starting surface close to the terminal plane, and extends a certain length in the direction of the bottom structure 104 of the button 1, so as to form a button wedge-shaped catch 107 as a whole, which is symmetrically distributed on the two convex columns 106, and is provided with a first upper inclined plane 107a and a lower inclined plane structure 107b.

[0074] As Figure 4a and Figure 4bAs shown, in some embodiments, the gland 2 is a hollow cylinder structure with two ends, a middle partition and a step. One end is a large cylinder, the other end is a small cylinder, and the first step 204 is the boundary plane between the large cylinder and the small cylinder. The small cylinder is provided with a first outer surface 201 and a first inner cavity surface 202. The upper end of the gland 2 is a first circular ring plane 203, and the lower end is a second circular ring plane 205. The large cylinder is provided with a first inner cavity 206 and forms a first inner cavity bottom surface 206a. The counterbore 207 is a circular ring structure starting from the circular ring plane at the upper end of the gland 2, with a diameter larger than that of the first inner cavity 206, and extending downward for a certain length, thereby forming a circular ring step with the first inner cavity 206, which acts as a matching convex ring 105. During movement, the convex ring 105 can also make linear motion up and down in the first inner cavity 206. The gland guide column 208 is a columnar body starting from the first step 204, ending at the bottom second circular ring plane 205, and attached to the first outer surface 201, which is symmetrically distributed on both sides. The preferred shape is isosceles trapezoidal. The gland guide groove 209 is an isosceles trapezoidal columnar groove formed by the surface of the first inner cavity surface 202 inward to the direction of the gland guide column 208, with a certain depth, and is also symmetrically distributed. The gland buckle 210 is a columnar buckle attached to the surface of the first outer surface 201 with a certain width, which cooperates with the shell 11 to fix and install the gland 2 on the shell 11. On both sides of the gland buckle 210, a rectangular first through slot 211 is provided respectively for fixing the base 6. With the first step 204 as the bottom surface, a cylindrical body with an outer diameter smaller than the first inner cavity surface 202 extends downward, the cylindrical body is hollow, forming a second inner cavity 212 and a second inner cavity bottom surface 212a. The gland 2 is provided with an opening 215 matching the convex column 106. With the bottom surface of the opening 215 as the starting surface, a pair of mutually symmetrical "convex" shaped grooves are provided extending downward, with dimensions slightly larger than the outer dimensions of the convex column 106, facilitating the insertion of the convex column 106. A middle partition 216 is formed in the middle position of the groove, with a second upper inclined plane 216a and a lower inclined plane 216b formed on the upper and lower sides of the middle partition 216, which constitute the upper and lower gland grooves matching the button wedge-shaped catch 107.

[0075] As shown, Figure 5 In some embodiments, the injection spring support 3 is a cylindrical structure, the upper end of the injection spring support 3 is a mushroom-shaped second circular plane structure 301, and the lower end is a circular structure 302. The diameter of the rod body 303 is smaller than the inner diameter of the injection spring 4, facilitating the installation and force storage of the injection spring 4. The circular structure 302 abuts against the upper end of the injection spring 4, and the second circular plane structure 301 abuts against the second inner cavity bottom surface 212a to keep relative stillness.

[0076] As shown, Figure 6As shown in some embodiments, the injection spring 4 is a compression spring structure with a certain length, having a spring top end 401 and a spring bottom end 402. The inner diameter of the injection spring 4 needs to be larger than the diameter of the rod body 303, and the outer diameter of the injection spring 4 needs to be smaller than the diameter of the spring cavity 502. The spring top end 401 is in contact with the second inner cavity bottom surface 212a, and the spring bottom end 402 is in contact with the spring cavity bottom surface 502a. The two sides interact with each other, and are used for the storage and release of the injection spring 4.

[0077] As shown in some embodiments, Figure 7a and Figure 7b As shown in some embodiments, the push rod 5 is a hollow and one-end open cylindrical structure. The push rod outer surface 501 is the circular ring-shaped outer surface of the push rod 5, and the spring cavity 502 is the circular ring-shaped inner cavity of the push rod 5, having a certain depth and forming a spring cavity bottom surface 502a. The upper end of the push rod 5 is a first circular ring-shaped plane structure 503, and the lower end is a third circular plane structure 504, which is in contact with the upper plug 1302 of the double-cavity cartridge bottle 13 and is forced to push down the rubber plug, thereby performing injection. The upper end of the push rod 5 is provided with a first columnar structure 505 with an upper radial inclined surface 506, and the middle part of the push rod 5 is provided with a first hook hole 507, which is a rectangular straight slot hole penetrating through the outer surface of the push rod 5 and located below the first columnar structure 505, and is used for fixing the base 6.

[0078] As shown in some embodiments, Figure 8a and Figure 8bAs shown, in some embodiments, the base 6 is a hollow cylinder structure with two ends, a partition in the middle and steps. One end is a large cylinder and the other end is a small cylinder. The second step 606 is the boundary plane between the large cylinder and the small cylinder. The large cylinder has an upper end outer surface 601, an upper end inner cavity surface 602 and an upper end inner cavity bottom surface 608. The small cylinder has a lower end outer surface 603 and a lower end inner cavity surface 604. The upper and lower ends of the base 6 are respectively an upper end circular ring plane structure 605 and a lower end circular ring plane structure 607. The base mounting buckle 609 is distributed on the upper end outer surface 601. The upper surface of the base mounting buckle 609 is a beveled columnar body that can be buckled into the first through groove 211, thereby fixing the base 6. The base 6 is provided with a base sliding groove 610 arranged in the upward and downward directions. The upper end of the base sliding groove 610 starts from the upper end inner cavity bottom surface 608 and extends downward by a certain depth, but the bottom surface is provided with a certain slope for cooperating with the first columnar structure 505 to make linear motion in the upward and downward directions during movement. The collision protrusions 611 are provided on both sides of the base sliding groove 610. The collision protrusions 611 start from the second step 606 and extend downward by a certain depth. The end of the collision protrusions 611 is provided with a toothed structure. The first clamping hook 612 with elasticity is arranged below the base sliding groove 610. The first clamping hook 612 is a certain distance from the lower end of the base 6. The first clamping hook 612 can cooperate with the first hook hole 507. In this embodiment, the first clamping hook 612 is arranged in a circumferentially symmetrical manner. A second hook hole 613 in the shape of a long rectangle is further arranged between the first clamping hook 612 and the lower end of the base 6. The second hook hole 613 is used to fix the unlocking piece 9. A base guide column 615 is further arranged in the vertical direction of the base sliding groove 610. The base guide column 615 starts from the upper end of the base 6 and ends at the second step 606 and is attached to the upper end outer surface 601 and is arranged in a bilaterally symmetrical manner. The shape of the base guide column 615 is isosceles trapezoidal and can be buckled into the outer shell 11. The base 6 is further provided with a second through groove 614 corresponding to the position of the opening 215. The shape of the second through groove 614 is crescent-shaped, which facilitates the connection of the convex column 106 and the unlocking piece 9.

[0079] As Figure 9As shown, in some embodiments, the sound production member 7 is a hollow cylindrical structure with two ends. The sound production member 7 has a first circular ring-shaped outer surface structure 701 and a first circular ring-shaped inner cavity structure 702. The upper and lower ends of the sound production member 7 are respectively an upper circular flat surface structure 703 and a first lower circular ring-shaped flat surface structure 704. The sound production member 7 is provided with a second columnar structure 705 with a lower radial inclined surface 706 and matched with the first columnar structure 505. The second columnar structure 705 starts from the first lower circular ring-shaped flat surface structure 704 and extends to the upper end and exceeds the height of the upper circular flat surface structure 703 by a certain distance. The second columnar structure 705 is symmetrically arranged. On the left side of the second columnar structure 705, there is a first crescent-shaped groove 707 with a certain depth, which plays a role in reducing the mass of the component. On the right side of the second columnar structure 705, there is also a second crescent-shaped groove 708 with a certain depth, and the bottom surface is in the shape of an inclined surface matched with the first columnar structure 505. When the first columnar structure 505 and the second columnar structure 705 are separated, the first columnar structure 505 will fall into the second groove 708.

[0080] As Figure 10As shown, in some embodiments, the sound generating spring 8 is a compression spring structure with a certain length, having a sound generating spring upper end structure 801 and a sound generating spring lower end structure 802. The inner diameter of the spring needs to be larger than the diameter of the lower end outer surface 603, and the outer diameter of the spring needs to be smaller than the inner diameter of the unlocking piece 9, and is installed in the inner cavity of the unlocking piece 9. In the initial state, the sound generating spring upper end structure 801 and the first lower circular ring plane structure 704 are in abutment; the sound generating spring lower end structure 802 and the unlocking piece 9 are in abutment, and the two sides interact to store force and release for the sound generating spring 8. When the push rod 5 is injected downward, the first columnar structure 505 and the second columnar structure 705 are synchronously pushed downward in the base sliding groove 610; due to the slope setting of the first columnar structure 505 and the second columnar structure 705, the axial force of the first columnar structure 505 and the second columnar structure 705 respectively received by the injection spring 4 and the sound generating spring 8 will be decomposed into a part of radial force due to the slope, causing the sound generating piece 7 to generate rotation in the radial direction, that is, the slope of the second columnar structure 705 slides relative to the slope of the first columnar structure 505, but at the beginning of injection, since the first columnar structure 505 and the second columnar structure 705 are both in the base sliding groove 610, the radial force cannot make the second columnar structure 705 rotate; at the end of injection, the second columnar structure 705 will be out of the constraint of the base sliding groove 610, at which time the second columnar structure 705 starts to rotate, the first columnar structure 505 continues to move downward, and the slopes of the first columnar structure 505 and the second columnar structure 705 will cause them to separate, after the two are separated, the sound generating spring 8 abuts against the sound generating piece 7 to slide upward, the slope of the second columnar structure 705 collides with the collision protrusion 611 to emit sound, and when the first columnar structure 505 and the second columnar structure 705 are separated, the injection is about to be completed, the first columnar structure 505 will immediately stop or only move downward a very short distance, thereby ensuring that the slope of the second columnar structure 705 will collide with the collision protrusion 611 only after the injection is completed.

[0081] As Figure 12a and Figure 12bAs shown, in some embodiments, the unlocking piece 9 is a hollow cylindrical structure. The unlocking piece 9 has a second circular ring-shaped outer surface 901 and a second circular ring-shaped inner cavity 902, and the upper and lower ends of the unlocking piece 9 are respectively a first upper circular ring-shaped flat structure 903 and a second lower circular ring-shaped flat structure 904. The unlocking piece 9 is movably sleeved outside the base 6, and the second circular ring-shaped inner cavity 902 is provided with an unlocking limiting portion for limiting the first clamping hook 612 from being clamped into the first hook hole 507, which is usually the inner wall of the second circular ring-shaped inner cavity 902. The upper end of the unlocking piece 9 is provided with two symmetrical unlocking cylindrical structures with a certain length, which include an unlocking convex column 905 and a head cylindrical structure 906. The unlocking convex column 905 is in the shape of a crescent, and the upper end is provided with a terminal flat structure 905a. The two sides of the unlocking convex column 905 are flat, and the width needs to be less than one-fourth of the arc of the body. A head cylindrical structure 906 with a width less than the unlocking convex column 905 and a thickness greater than the second circular ring-shaped outer surface 901 is provided on the plane of the terminal flat structure 905a and extends outwardly, and is terminated with a cylindrical structure plane 906a. The head cylindrical structure 906 is matched with the second through groove 614 in shape and size. The middle part of the unlocking piece 9 is provided with a rectangular unlocking opening 907 for making the first clamping hook 612 disengage from the first hook hole 507, and the unlocking opening 907 is vertically distributed with the unlocking convex column 905. The lower part of the unlocking piece 9 is provided with a second clamping hook 908 with elasticity, which is located below the unlocking opening 907 and is used for clamping into the second hook hole 613 to fix the base 6. The lower end of the unlocking piece 9 extends out a new inner cavity structure 909, forming a first step surface 909a. The lower end of the unlocking piece 9 is provided with two discontinuous wedge-shaped steps 910 that rotate a certain angle around the second circular ring-shaped outer surface 901, and the wedge-shaped steps 910 are provided with an upper step surface 910a, a lower step surface, and a side step surface 910b.

[0082] As Figure 13a and Figure 13bAs shown, in some embodiments, the release member 10 is a hollow cylindrical structure with two ends. The release member 10 has a second circular ring-shaped outer surface structure 1001 and a second circular ring-shaped inner cavity structure 1002. The release member 10 is movably sleeved outside the unlocking member 9, and the inner wall of the second circular ring-shaped inner cavity structure 1002 can allow the second hook 908 to be clamped into the second hook hole 613. The upper and lower ends of the release member 10 are respectively a second circular ring-shaped plane structure 1003 and a third circular ring-shaped plane structure 1004. The lower outer wall of the release member 10 is provided with a ring of convex ring structures 1005, and the upper end of the convex ring structure 1005 is provided with an upper end face 1005a which cooperates with the lower end face of the release spring. The upper end of the release member 10 is provided with two symmetrical release columnar structures 1010 of a certain length, and the upper end face of the release columnar structure is provided with an inclined columnar structure 1010a. The shape of the release columnar structure 1010 is a crescent shape, and the two sides are flat, and the width is less than one-fourth of the arc of the body, which cooperates with the columnar groove 2007. The release member 10 is also provided with a release member guide column 1006 attached to the second circular ring-shaped outer surface structure 1001, and the release member guide column 1006 is symmetrically distributed on both sides and terminates at the inclined columnar structure 1010a. The release member 10 is provided with a cuboid slot penetrating through the second circular ring-shaped outer surface structure 1001, and the cuboid slot is provided with a release member buckle structure 1008, the end of which is bent inward to form an end plane 1008a, which cooperates with the unlocking member 9 to prevent the release member 10 from moving downward, and is stopped by the upper step face 910a in the initial state and cannot move downward. The surface of the second circular ring-shaped inner cavity structure 1002 is also provided with an "L"-shaped protrusion structure 1009, and the protrusion structure 1009 is provided with a plane 1009a and a second structure 1009b. The protrusion structure 1009 can be in contact with the wedge-shaped step 910. The release member 10 is rotatably installed, and when it is rotated to a certain angle, the upper step face 910a is in contact with the second structure 1009b, thereby limiting the release member. At the same time, the release member guide column 1006 is clamped into the third structure 2008, thereby limiting the left and right rotation of the release member.

[0083] As Figure 14a and Figure 14bAs shown, in some embodiments, the shell 11 is a hollow cylindrical structure with two ends. The shell 11 has a shell annular outer surface 1101 and a shell annular inner cavity 1102. The upper and lower ends of the shell 11 are respectively provided with a second upper annular planar structure 1103 and a third lower annular planar structure 1104. The upper end of the shell 11 is provided with a rectangular straight slot mounting hole 1105 for cooperating with the gland buckle 210 to install and fix the gland 2. The upper end of the shell annular inner cavity 1102 is provided with a sliding groove 1106 for cooperating with the gland guide column 208 and the fixing member guide column 2006, facilitating the installation of the base 6. The lower end of the shell annular inner cavity 1102 is provided with a circumferential internal thread 1107, and an anti-reverse clamping groove 1108 is further provided at the internal thread 1107 for cooperating with the refill holder 12. A rectangular window 1109 is provided on the surface of the shell 11. When the refill holder 12 is rotated to a certain stage, the corresponding letter mark will be displayed on the window 1109, giving people an intuitive visual experience. Anti-slip protrusions 1110 with a certain length and thickness are respectively provided on both sides of the window 1109, which serve as anti-slip effect when the injection pen is placed on the table top.

[0084] As Figure 15a and Figure 15bAs shown, in some embodiments, the refill holder 12 is a hollow cylindrical structure with two ends. The refill holder 12 has a refill holder circular outer surface 1201 and a refill holder inner cavity 1202, which is polygonal and consistent with the shape of the fixing block of the double-cavity cartridge bottle 13 head. The upper and lower ends of the refill holder 12 are respectively a third upper circular ring plane structure 1203 and a fourth lower circular ring plane structure 1204. The lower part of the refill holder circular outer surface 1201 is provided with an annular stepped surface 1205, and the annular stepped surface 1205 is provided with an upper circular ring plane 1205a and a lower circular ring plane 1205b. The refill holder circular outer surface 1201 is provided with an external thread 1206 between the upper circular ring plane 1205a and the third upper circular ring plane structure 1203, which is engaged with the internal thread 1107. The refill holder 12 is further provided with a first anti-reverse buckle 1207a, a second anti-reverse buckle 1207b, and a third anti-reverse buckle 1207c in sequence at different heights from top to bottom of the external thread 1206. The sound and anti-reverse effects at different stages during the upward rotation of the refill holder 12 are the same in size and shape. The refill holder 12 is further provided with a plurality of letter marks at positions corresponding to the first anti-reverse buckle 1207a, the second anti-reverse buckle 1207b, and the third anti-reverse buckle 1207c. The lower circular ring plane 1205b is further provided with a cap clamping platform 1208, which has a certain width and is circumferentially distributed, and the number is at least two, which is used to fix the cap. The lower part of the refill holder 12 is further provided with an inwardly inclined medicine bottle buckle 1209, which is circumferentially symmetrically distributed. The medicine bottle buckle 1209 can cooperate with the fixing block of the double-cavity cartridge bottle 13 head to fix the double-cavity cartridge bottle 13, so that the double-cavity cartridge bottle 13 cannot move up and down in the refill holder 12. The lower end of the refill holder 12 is further provided with a circular stepped surface 1211 for stopping the bottom surface of the fixing block of the double-cavity cartridge bottle 13 head; the lower end of the refill holder inner cavity 1202 is further provided with a plurality of first column structures 1210 for cooperating with the fixing of the double-cavity cartridge bottle 13. The lower end of the refill holder is further provided with an annular clamping groove 1212 and a wedge-shaped locking block 1213 for cooperating with the hidden needle sleeve 15.

[0085] As Figure 16As shown, in some embodiments, the needle cover 15 is a hollow cylindrical structure with two ends. The needle cover 15 has a needle cover circular ring outer surface 1501 and a needle cover circular ring inner cavity 1502. The upper and lower ends of the needle cover 15 are respectively a needle cover upper circular ring plane structure 1503 and a needle cover lower circular ring plane structure 1504. The needle cover circular ring inner cavity 1502 is provided with a circular ring step 1505, the upper end surface of the circular ring step 1505 is a circular ring inclined plane 1505a, and the lower end surface is a third circular ring plane 1505b. The needle cover circular ring inner cavity 1502 is also provided with a second cylindrical structure 1506 in the shape of a crescent, which starts from the upper end of the needle cover 15 and extends a certain distance downward, but cannot contact the circular ring step 1505. The second cylindrical structure 1506 can rotate in the annular clamping groove 1212 and form a stop state with the wedge-shaped locking block 1213 after rotating to a certain position. A plurality of needle mounting grooves 1507 are also provided between the third circular ring plane 1505b and the needle cover lower circular ring plane structure 1504, and a second step surface 1508 is provided at the bottom of each needle mounting groove 1507. The needle mounting groove 1507 is used to cooperate with the installation of the needle cap 17. A certain number of serrated cylindrical structures are also provided on the needle cover circular ring outer surface 1501 corresponding to the positions of the needle mounting grooves 1507, which can facilitate the installation of the needle cover 15.

[0086] As shown, Figure 11 In some embodiments, the needle spring 16 has a certain length of compression spring structure, with a spring top end structure 1601 and a spring bottom end structure 1602. The inner diameter of the needle spring 16 needs to be larger than the diameter of the needle cap 17, and the outer diameter of the needle spring 16 needs to be smaller than the diameter of the needle cover circular ring inner cavity 1502, and is installed in the inner cavity of the needle cover 15. In the initial state, the spring top end structure 1601 and the third circular ring plane 1505b are in abutment; the spring bottom end structure 1602 and the needle cap 17 are in abutment, and the two sides interact to store and release the force of the needle spring 16.

[0087] As shown, Figure 17As shown, in some embodiments, the hidden needle cap 17 is a cylindrical structure with hollow ends. The hidden needle cap 17 has an annular outer surface 1701 and an annular inner cavity 1702. The upper and lower ends of the hidden needle cap 17 are respectively a fifth annular planar structure 1703 and a fourth annular planar structure 1704. The upper end of the annular outer surface 1701 of the hidden needle cap is provided with several mounting sliders 1705 that engage with the hidden needle mounting groove 1507. The mounting sliders 1705 are circumferentially distributed and their number matches that of the hidden needle mounting groove 1507. The lower end of the annular outer surface 1701 of the hidden needle cap is provided with a protruding ring portion that engages with the bottom end structure 1602 of a spring. The fourth annular planar structure 1704 is also provided with several spaced protrusions to increase the contact area between the planar structure and the skin, thus better securing the injection pen.

[0088] like Figure 18 As shown, in some embodiments, the pen cap 18 is a hollow cylindrical structure with one open end. The pen cap 18 has a pen cap annular outer surface 1801 and a pen cap annular inner cavity 1802. The upper end of the pen cap 18 is a fourth circular planar structure 1803, and the pen cap 18 is provided with an annular groove 1804 that matches the pen cap fastener 1208.

[0089] like Figure 19 As shown, in some embodiments, the dual-chamber cartridge bottle 13 includes a third inner cavity 1301, an upper stopper 1302, a lower stopper 1303, and a channel 1304. The channel 1304 is located in the lower part of the cartridge bottle and is lower than the bottom surface of the lower stopper 1303 to prevent the liquid medicine from mixing with the powder medicine prematurely. The liquid medicine is stored between the upper stopper 1302 and the lower stopper 1303, while the powder medicine or other substances are stored in the lower stopper 1303 and the bottom of the cartridge bottle. During movement, the upper stopper 1302 is pushed downwards by the force, which simultaneously pushes the lower stopper 1303 to move, so that the top of the lower stopper 1303 is lower than the top of the channel 1304, thereby allowing the liquid medicine to flow from the channel into the bottom of the cartridge bottle and mix with the powder medicine.

[0090] like Figure 20As shown, in some embodiments, the fixing member 20 is a cylindrical structure with hollow ends, a partition in the middle, and steps. One end is a large cylinder, and the other end is a small cylinder. The annular platform 2004 is the dividing plane between the large cylinder and the small cylinder. The fixing member includes a second outer surface 2001 and a second inner cavity surface 2002. The upper and lower ends of the fixing member are respectively a fourth annular plane 2003 and a fifth annular plane 2005. The guide post 2006 starts from the fourth annular plane 2003 and ends at the annular platform 2004, and is attached to the outer surface of the large cylinder. It is symmetrically distributed on both sides and has an isosceles trapezoidal shape. It is used for guiding and fixing the fixing member when it is installed inside the shell. The columnar groove 2007 is a crescent shape that starts from the fourth annular plane 2003 and has a certain depth. It is symmetrically distributed and used for the left and right limit and radial linear movement of the unlocking protrusion 905. The third structure 2008 originates from the fifth annular plane 2005 and is attached to the surface of the columnar groove 2007, extending upwards a certain distance as a columnar structure. Simultaneously, a central groove is formed at a certain distance in the middle to fix the release guide post 1006 and prevent lateral swaying. The upper surface of the third structure 2008 is an inclined plane, used to cooperate with the inclined columnar structure 1010a to provide downward limiting.

[0091] like Figure 21 As shown, in some embodiments, the release spring 19 is a compression spring structure of a certain length, having an upper release spring structure 1901 and a lower release spring structure 1902. The inner diameter of the release spring 19 needs to be larger than the diameter of the second outer surface 2001, and the outer diameter of the release spring 19 needs to be smaller than the diameter of the annular inner cavity 1102 of the outer shell. It is installed on the outer surface of the fixing member 20. In the initial state, the upper release spring structure 1901 abuts against the annular platform 2004; the lower release spring structure 1902 abuts against the upper end surface 1005a. The two sides interact with each other to release the force stored in the release spring 19 and release it. Another function is to control the release member to move arbitrarily in a free state, forming a relatively fixed state.

[0092] The actual usage of this solution can be divided into the following states:

[0093] 1. Initial state: such as Figure 22As shown, the pen refill holder 12 is screwed into the pen body shell 11 to a certain depth. At this time, the window 1109 will display the letter A, indicating that the initial installation has been completed. Before any other operation, the parts of the injection pen are relatively stationary. If button 1 is pressed, there should be no action. In this state, the first hook 612 remains engaged in the first hook hole 507, the second hook 908 remains engaged in the second hook hole 613, the button wedge hook 107 is engaged in the cap groove, the bottom end of the protrusion 106 abuts against the top end of the head columnar structure 906 of the unlocking member 9, the release spring 19 abuts against the release member 10, and the bottom end of the push rod 5 abuts against the dual-chamber cartridge bottle 13.

[0094] 2. Mixed state: such as Figure 23 As shown, the user holds the pen body shell 11 with one hand and the pen refill holder 12 with the other, rotating it upwards. The pen refill holder 12 will move upwards, and correspondingly, the push rod 5 will move downwards against the upper stopper 1302 of the dual-chamber cartridge 13 until the window 1109 displays the letter B. At this point, a "click" sound will be heard, indicating that the second anti-reverse latch 1207b of stage B has engaged with the anti-reverse latch 1108, and that the liquid and powder between the upper stopper 1302 and the lower stopper 1303 have been mixed. To ensure that the liquid and powder are fully mixed, the pen can be held with both hands and shaken left and right several times.

[0095] 3. Exhaust status: such as Figure 24 As shown, the user continues to rotate the pen refill holder 12 upwards. At this time, the third upper annular plane structure 1203 at the upper end of the pen refill holder 12 will contact the third annular plane structure 1004 at the lower end of the release member 10. Continue to rotate upwards, thereby pushing the release member 10 upwards along the slide groove 1106. Until the window 1109 displays the letter C, a "click" sound will be heard. This is the third anti-reverse latch 1207c of stage C engaging with the anti-reverse latch 1108. At this time, the upper annular plane 1205a at the top of the pen refill holder 12 is exactly against the third lower annular plane structure 1104 at the lower end of the outer shell 11, so that a small amount of liquid will be discharged from the needle. The release member 10 is pushed up by the pen refill holder 12 by one end, and the release member 10 releases the engagement of the second hook 908 and the second hook hole 613. At this time, the inner wall of the release member 10 is still partially against the second hook 908 and is subjected to the squeezing force (friction) of the inner wall of the release member 10. The second hook 908 is also still retained in the second hook hole 613 and is subjected to the force of the hook hole, so that the unlocking member 9 remains stationary in the axial direction. However, the force of the release member 10 and the force of the second hook hole 613 can be overcome by the force of pressing the button 1, so that the unlocking member 9 can slide by pressing the button 1.

[0096] 4. Injection status: such as Figure 25As shown, the user will align the middle of the needle cap 17 at the front of the injection pen with the injection site, and make radial contact with the skin, while holding the injection pen and pressing it down, the needle cap 17 is subjected to downward pressure and resistance from the surface of the skin, and the needle leaks out and penetrates the human body. At this time, the user presses the button 1 down, the first circular ring-shaped outer surface 101 of the button 1 makes a linear downward movement in the first inner cavity 206 of the gland 2, the button wedge-shaped catch 107 is separated from the gland groove, prompting the bottom end of the protruding column 106 to push the unlocking piece 9 downward. When the button 1 cannot be pressed any further, it means that the bottom surface structure 104 of the button 1 has completely contacted the first inner cavity bottom surface 206a of the gland 2, at this time the first upper inclined plane 107a will be blocked by the lower inclined plane 216b (i.e. the button wedge-shaped catch 107 is locked in the lower gland groove), further indicating that the protruding column 106 has pushed the unlocking piece 9 to the maximum position of movement, at this time the unlocking opening 907 is directly opposite the first catch 612, the first catch 612 will not be subjected to the inward thrust of the unlocking limiting portion, under the greater thrust of the injection spring 4, the first catch 612 is separated from the first hook hole 507, the first catch 612 is locked in the unlocking opening 907 due to the elastic force, the constraint between the base 6 and the push rod 5 is removed, the push rod 5 is separated from the base 6, the injection spring 4 changes from the compressed energy storage state to the expanded working state, the injection spring 4 pushes the push rod 5 to move downward, thereby extruding the upper plug 1302 and the lower plug 1303 of the double-cavity cartridge bottle 13 to move downward synchronously, and injection is performed. The first columnar structure 505 at the top of the push rod 5 is combined with the second columnar structure 705 of the sound-producing piece 7 and is locked in the base sliding groove 610, during the downward injection of the push rod 5, the first columnar structure 505 and the second columnar structure 705 are in contact due to the inclined surfaces, and can only make linear downward movement due to the restriction of the base sliding groove 610, at the end of the injection, the sound-producing piece has moved downward by a certain distance and is no longer restricted by the base sliding groove 610, at this time it is in a critical state, the push rod 5 continues to push the sound-producing piece 7, due to the inclined surfaces of the first columnar structure 505 and the second columnar structure 705, the sound-producing piece 7 rotates in the radial direction, at the end of the injection, the first columnar structure 505 and the second columnar structure 705 are offset from each other, when the sound-producing piece 7 is no longer subjected to the downward thrust of the push rod 5, the sound-producing piece 7 is subjected to the upward thrust of the sound-producing spring 8, thereby causing the collision of the collision protrusion 611 of the sound-producing piece 7 and the base 6, to produce a "click" sound, indicating that the injection is complete. After the first columnar structure 505 and the second columnar structure 705 are offset, the first columnar structure 505 will immediately stop or only move downward by a very short distance, thereby ensuring that the inclined surface of the second columnar structure 705 will collide with the collision protrusion 611 only after the injection is completely completed. The pen cartridge holder 12 in the present scheme is preferably made of transparent material, and the user can also visually check whether the rubber plug in the double-cavity cartridge bottle 13 has been pushed to the bottom to further determine the injection condition. The button 1 after being pressed will be locked and cannot return to the initial state.

[0097] The injection pen of the present scheme is small in size, convenient for patients to carry, and can be injected at any time. The injection pen of the present scheme is simple to operate, and the automatic injection function reduces the operation burden of the patient, especially suitable for patients with poor self-care ability. The injection pen of the present scheme is provided with multiple safety protection designs, the push rod 5 and the base 6 are locked through the first hook 612, the unlocking piece 9 and the base 6 are locked through the second hook 908, and the injection operation can be performed only after the unlocking piece 9 and the unlocking piece 9 are unlocked in sequence, the function of preventing accidental touch is realized, the occurrence of accidental injury is effectively avoided, and the present scheme realizes the function of sounding after injection is completed, has higher functionality, and the sounding structure is separated through the sliding of two inclined surfaces, and the operation is more smooth.

[0098] The above only describes the preferred embodiments of the present application, and cannot limit the scope of the present application, that is, any simple equivalent changes and modifications made according to the scope of the present application and the content of the present application description are still within the scope of the present application.

Claims

1. A dual-chamber automatic injection pen, comprising a housing (11), a cartridge holder (12), a dual-chamber cartridge (13), a push rod (5), a base (6), an unlocking member (9), a releasing member (10), an injection spring (4) and a button (1), wherein the dual-chamber cartridge (13) is provided with an upper plug (1302) and a lower plug (1303), the cartridge holder (12) is internally provided with a cartridge holder inner cavity (1202) for mounting the dual-chamber cartridge (13), the cartridge holder (12) is externally provided with an external thread (1206), the housing (11) is internally provided with an internal thread (1107) matched with the external thread (1206), the cartridge holder (12) is rotationally connected with the housing (11), in the process of rotating the cartridge holder (12) upward relative to the housing (11), the push rod (5) is pressed against the upper plug (1302) of the dual-chamber cartridge (13) to mix two drugs in the dual-chamber cartridge (13), the push rod (5) is provided with a first hook hole (507), the base (6) is provided with a first hook (612) matched with the first hook hole (507), the base (6) is further provided with a second hook hole (613), and the unlocking member (9) is provided with a second hook (908) matched with the second hook hole (613); the unlocking member (9) is slidably sleeved outside the base (6) to keep or release the first hook hole (507) and the first hook (612), after the first hook hole (507) and the first hook (612) are released, the push rod (5) is released, the injection spring (4) pushes the push rod (5) to downward inject the mixed drugs, the releasing member (10) is slidably sleeved outside the unlocking member (9) to keep or release the second hook hole (613) and the second hook (908), and before the second hook hole (613) and the second hook (908) are released, the button (1) is in a locked state to prevent the push rod (5) from being released; the cartridge holder (12) is provided with a first anti-reverse buckle (1207a), a second anti-reverse buckle (1207b) and a third anti-reverse buckle (1207c), the first anti-reverse buckle (1207a), the second anti-reverse buckle (1207b) and the third anti-reverse buckle (1207c) are sequentially arranged at different heights of the outer wall of the cartridge holder (12) from top to bottom, the housing (11) is internally provided with anti-reverse buckle grooves (1108) matched with the first anti-reverse buckle (1207a), the second anti-reverse buckle (1207b) and the third anti-reverse buckle (1207c), and when the cartridge holder (12) rotates upward relative to the housing (11), the first anti-reverse buckle (1207a), the second anti-reverse buckle (1207b) and the third anti-reverse buckle (1207c) are sequentially buckled into the anti-reverse buckle grooves (1108).

2. The dual chamber structure automatic injection pen of claim 1, wherein, When the first anti-reverse buckle (1207a) is buckled into the anti-reverse buckle slot (1108), the push rod (5) abuts against the upper plug (1302) of the double-cavity cartridge (13), the first hook hole (507) and the first hook (612) remain buckled, and the second hook hole (613) and the second hook (908) remain buckled.

3. The dual chamber structure automatic injection pen of claim 1, wherein, When the second anti-reverse buckle (1207b) is buckled into the anti-reverse buckle slot (1108), the upper plug (1302) and the lower plug (1303) abut against each other.

4. The dual chamber structure automatic injection pen of claim 1, wherein, When the third anti-reverse buckle (1207c) is buckled into the anti-reverse buckle slot (1108), the release piece (10) is lifted by the pen core holder (12), and the release piece (10) releases the second hook hole (613) and the second hook (908).

5. The dual chamber structure automatic injection pen of claim 4, wherein, After the release piece (10) releases the second hook hole (613) and the second hook (908), the second hook (908) of the unlocking piece (9) remains stationary in the axial direction under the force of the release piece (10) and the force of the second hook hole (613).

6. A dual chamber structure automatic injection pen according to any one of claims 1 to 5, wherein, The pen core holder (12) is further provided with a letter mark, and the shell (11) is provided with a window (1109) matched with the letter mark.

7. The dual chamber structure automatic injection pen of claim 1, wherein, The hidden needle sleeve (15) is installed at the lower end of the pen core holder (12), and the hidden needle cap (17) is sleeved at the lower end of the hidden needle sleeve (15) and movably connected with the hidden needle sleeve (15). The hidden needle spring (16) is further installed in the hidden needle sleeve (15) and abuts against the hidden needle cap (17).

8. The dual chamber structure automatic injection pen of claim 7, wherein, The pen cap (18) is sleeved on the hidden needle sleeve (15) and detachably connected with the hidden needle sleeve (15).

9. The double-cavity structure automatic injection pen according to claim 1, wherein the lower end of the button (1) is provided with a convex column (106), the unlocking piece (9) is provided with an unlocking columnar structure matched with the convex column (106), and when the button (1) is pressed, the convex column (106) abuts against the unlocking columnar structure, so that the unlocking piece (9) slides downward.

10. The dual chamber structure automatic injection pen of claim 1, wherein, The button (1) is provided with a button wedge-shaped hook (107), the pressure cover (2) is provided with an upper pressure cover groove and a lower pressure cover groove matched with the button wedge-shaped hook (107), the button wedge-shaped hook (107) is buckled into the upper pressure cover groove before the button (1) is pressed, and the button wedge-shaped hook (107) is buckled into the lower pressure cover groove after the button (1) is pressed.

11. The dual chamber, automatic injection pen of claim 1, wherein, Also include sound production piece (7) and sound production spring (8), the push rod (5) is equipped with first columnar structure (505), the bottom of first columnar structure (505) is equipped with upper radial inclined surface (506), the base (6) is equipped with base sliding slot (610) and collision convex part (611), the sound production piece (7) is equipped with second columnar structure (705) that cooperates first columnar structure (505), the top of second columnar structure (705) is equipped with lower radial inclined surface (706), the sound production piece (7) is movably set on the base (6), the sound production spring (8) is upwardly pressed the sound production piece (7);In the initial stage of the push rod (5) downward injection, first columnar structure (505) and second columnar structure (705) are pushed down in the base sliding slot (610), in the final stage of injection, second columnar structure (705) is separated from the constraint of base sliding slot (610), first columnar structure (505) still remains in base sliding slot (610), because of the inclined surface setting of first columnar structure (505) and second columnar structure (705), the sound production piece (7) generates rotation in radial direction, after first columnar structure (505) and second columnar structure (705) completely separate, the sound production spring is pressed against the sound production piece (7) and collides with the collision convex part (611), to emit sound prompt injection completion.

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