Dose adjusting sound production structure, torsion spring automatic injector and jumping tooth

Abstract

The invention discloses a dose adjusting and setting sound production structure, a torsion spring automatic injector and a bouncing tooth.The dose adjusting and setting sound production structure comprises a clutch tooth, a bouncing tooth and a rotary knob, a clutch ratchet ring is arranged on the upper end face of the clutch tooth, the bouncing tooth is arranged above the clutch tooth, the bouncing tooth is arranged on the inner side of the rotary knob in a sleeving mode, and the bouncing tooth is arranged on the inner side of the rotary knob in a sleeving mode. The jumping teeth and the knob are respectively provided with a first part and a second part which are matched with each other; the side wall of the knob is provided with a jumping tooth, the jumping tooth is provided with an elastic arm, the lower end of the elastic arm is provided with a jumping ratchet meshed with the clutch ratchet ring, the side wall of the knob is further provided with an adjusting protruding block, the adjusting protruding block is arranged below the elastic arm, and the adjusting protruding block can jack up the elastic arm. According to the scheme, the structure is simple and compact, the matching degree is good, the appearance size of an injector product can be greatly reduced, production and assembly are convenient, the weight is light, and the using hand feeling is good.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a dose setting sound generating structure, an autoinjector, and a pulsating tooth structure. Background Art

[0002] Autoinjectors have reduced the difficulty of injection treatment and the pain of patients, and thus are welcomed by many medical workers and patients. All autoinjectors include a reservoir, and the energy of the reservoir is released to help the user inject a set dose of medicine.

[0003] A known winding pen injector using a torsion spring can be referred to Patent Document CN103249441B. This solution includes a housing for accommodating a syringe or cartridge for the medicine; a rotary drive shaft for rotating a preset amount that can be adjusted to cause extrusion of a corresponding amount of medicine from the syringe or cartridge; a torsion drive spring that is fixed relative to the drive shaft at one end region and is fixed to a joint at its other end region, the joint being adapted to non-rotatably engage a base on the housing. However, when adjusting the injection dose in this solution, if the user sets a dose greater than the expected dose and wants to reduce the set dose, it is rather troublesome. In addition, many syringes do not emit a prompt sound to remind the user when adjusting the injection dose, and the product is not user-friendly enough.

[0004] The invention patent with the authorization announcement number CN105682711B discloses a pen-type drug injection device, which includes: a housing; a dose selection member; a torsion spring fixed between the housing and the selection member, so that when the selection member rotates relative to the housing, energy is stored in the torsion spring; a driving member engaged with a lead screw; a first clutch that couples the driving member and the housing in terms of rotation in the coupled state and allows relative rotation between the driving member and the housing in the disconnected state; and a second clutch that couples the driving member and the selection member in terms of rotation in the coupled state and allows relative clockwise and counterclockwise rotation between the driving member and the selection member in the disconnected state. The second clutch includes a toothed ratchet click generator, and these teeth have different inclined tooth angles in the clockwise and counterclockwise directions, so that the teeth are allowed to cross each other in the disconnected state of the second clutch, and have different resistances in the clockwise and counterclockwise directions, so that the dose can be set and corrected by the user tightening or loosening the torsion spring accordingly. This solution provides a drive mechanism that allows the set dose to be easily reduced. However, in the solution, the dose button 15 is axially constrained to the clutch disc 16, which is achieved by a snap connection with the clutch disc 16. The clutch disc 16 is splined to the selection handle 14, and the driving member 8 is splined to the inner housing 5. The return spring 13 needs to play a role in maintaining the engagement of the ratchet feature between the driving member 8 and the clutch disc 16. In this way, the return spring 13 presses on the clutch disc 16, making it require greater force to adjust the rotation of the clutch disc 16, which affects the feel. Summary of the Invention

[0005] An object of the present invention is to address the deficiencies of the above-mentioned prior art. One of the objects is to provide a dose setting sound-generating structure that can freely adjust the injection dose and has a smoother adjustment, and its application in a torsion spring automatic syringe. Another object is to provide a structure-simplified jumping tooth structure.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: A dosage adjustment sound - generating structure includes a clutch gear, a jumping gear, and a knob. The jumping gear adopts the above - mentioned one - way ratchet. The jumping gear is arranged above the clutch gear, and the jumping gear is sleeved inside the knob. A first component and a second component that cooperate with each other are respectively arranged on the jumping gear and the knob. A spring arm is further arranged on the jumping gear. The lower end of the spring arm extends out of the lower end surface of the jumping gear and is provided with a jumping ratchet tooth. A clutch ratchet tooth ring that cooperates with the jumping ratchet tooth is arranged on the upper end surface of the clutch gear. An adjustment convex block is further arranged on the side wall of the knob, and the adjustment convex block is placed below the spring arm. When the knob rotates forward, the first component and the second component cooperate with each other so that the knob and the jumping gear can rotate synchronously, and the jumping ratchet tooth slides on the clutch ratchet tooth ring to adjust the dosage. When the knob rotates backward, the adjustment convex block presses against the spring arm so that the jumping ratchet tooth is separated from the clutch ratchet tooth ring, and thus the jumping gear can rotate freely backward.

[0007] Further, the first component can be a groove, a block, or other structures with contact surfaces arranged on the jumping gear, and the second component can be a block, a groove, or other structures with contact surfaces arranged on the knob and cooperating with the jumping gear. The principle is that the first component and the second component come into contact with each other to form a connection for the purpose of transmitting the rotational torque.

[0008] Further, the tooth profiles of the beating ratchet and the clutch ratchet ring are such that the forward rotation surface is inclined and the reverse rotation surface is vertical. When the beating ratchet is fully engaged with the clutch ratchet ring, the vertical reverse rotation surface prevents the beating tooth from freely reversing; when the knob rotates forward, the first component and the second component cooperate, and the knob and the beating tooth rotate synchronously. During forward rotation, the beating ratchet slides on the clutch ratchet ring. Due to the elastic force of the spring arm, after the beating ratchet finishes engaging with one tooth block of the clutch ratchet ring, it will fall into another tooth groove. Repeating this way, the continuous engagement between the beating ratchet and the clutch ratchet ring causes the beating ratchet to continuously jump between the tooth tips and tooth grooves of the clutch ratchet ring. The end face engagement and collision between the beating ratchet and the clutch ratchet ring will produce a relatively loud "clicking" forward rotation reminder sound. During forward rotation, the beating tooth will drive the connected injection component to rotate forward synchronously to accumulate energy. When the knob rotates in reverse, the beating ratchet and the clutch ratchet ring first remain engaged. Since the rotating block can rotate a certain angle in the rotating slot, during reverse rotation, the adjusting convex block upwardly presses against the spring arm. When the knob rotates in reverse by a certain angle, the lower end of the spring arm will be lifted by the adjusting convex block, causing the beating ratchet to disengage from the clutch ratchet ring. The reverse rotation surface cut-off ability of the clutch ratchet ring for the beating ratchet fails, so that the beating tooth can freely reverse due to the energy accumulated by the connected injection component. During reverse rotation, due to the elastic force of the spring arm, the beating ratchet and the clutch ratchet ring resume engagement. Repeating this way during reverse rotation, the end face collision between the beating ratchet and the clutch ratchet ring will also produce a relatively loud "clicking" reverse rotation reminder sound. During reverse rotation, the injection component dissipates energy and drives the beating tooth to rotate in reverse synchronously, and at the same time, the set dose value decreases.

[0009] Further, the clutch tooth is provided with a first positioning block and a second positioning block. The first positioning block is a convex rib arranged axially. On the left and right sides of the first positioning, there are radial positioning parts that restrict the radial rotation of the clutch tooth, and at the bottom of the first positioning, there is a first axial positioning part that restricts the axial movement of the clutch tooth. The second positioning block is an elastic convex block. At the bottom of the second positioning block, there is an inclined installation part, and on the upper end face of the second positioning block, there is a second axial positioning part that restricts the axial movement of the clutch tooth. This facilitates the installation of the clutch tooth onto the pen body of the syringe.

[0010] Further, the lower end face of the beating tooth corresponding to the rotating slot is inclined, and the upper end face of the rotating block is also inclined. This facilitates the beating tooth to be sleeved downward into the knob.

[0011] Further, the outer side surface of the knob is provided with several concave and convex patterns for easy screwing.

[0012] Further, a connecting ratchet or a connecting keyway is provided on the beating tooth to connect the injection member.

[0013] Further, the upper end surface of the adjusting bump is arc-shaped to match the lower end surface of the elastic arm, so that the cooperation between the clutch tooth, the beating tooth and the knob is closer, the activities between the structures are smoother, and the use feel is improved.

[0014] This solution also discloses a torsion spring automatic syringe, including a pen body, wherein the pen body is installed with a medicine bottle, an injection member and the above-mentioned dose setting and sounding structure; the injection member includes a release button, a clutch cylinder, a small push rod, a release spring, a torsion spring and a push rod driving member, the clutch tooth is fixedly installed at the upper end of the pen body, the knob is rotatably installed at the upper end of the pen body, the release button is installed at the upper end of the clutch cylinder, the release spring is arranged in the knob, and two ends of the release spring respectively abut and connect the release button and the pen body, and the release spring positions the clutch cylinder at the first clutch cylinder axial position; when setting the dose, the clutch cylinder is positioned at the first clutch cylinder axial position, the upper end of the clutch cylinder is connected to the beating tooth and can rotate synchronously with the beating tooth and the torsion spring; pressing the release button can push the clutch cylinder to be positioned at the second clutch cylinder axial position, the upper end of the clutch cylinder is separated from the beating tooth and releases the torsion spring to drive the clutch cylinder to rotate, when the clutch cylinder rotates, it drives the small push rod to rotate, and the push rod driving member converts the rotational torque of the small push rod into an axial pushing force, and then pushes and extrudes the medicine bottle to inject the medicine.

[0015] Further, a guide rod is provided at the lower end of the release button, the guide rod extends into the upper end of the clutch cylinder, the release button is installed at the upper end of the clutch cylinder through the guide rod and can move up and down, the upper end of the release button extends out of the upper end of the knob for convenient pressing, an anti-detachment buckle is provided between the guide rod and the clutch cylinder, when the clutch cylinder is positioned at the first clutch cylinder axial position, the anti-detachment buckles between the guide rod and the clutch cylinder are in contact and cooperate with each other, a release gap is provided between the lower end surface of the release button and the upper end surface of the clutch cylinder, pressing down the release button makes the release button move downward along the guide rod, the anti-detachment buckles between the guide rod and the clutch cylinder are separated from each other, after the lower end surface of the release button contacts the upper end surface of the clutch cylinder, it can push the clutch cylinder to be positioned at the second clutch cylinder axial position, after releasing the release button, the release spring will push the release button to move upward, and after the anti-detachment buckles between the guide rod and the clutch cylinder are in contact and cooperate with each other, it will drive the clutch cylinder to resume positioning at the first clutch cylinder axial position.

[0016] Further, the dose setting member further includes a graduated cylinder, the inner wall of the graduated cylinder is slidably connected to the outer wall of the clutch cylinder up and down, and the outer wall of the graduated cylinder is slidably connected to the inner wall of the pen body in a spiral manner; wherein, a plurality of mutually cooperating guide rails and sliders are provided on the inner wall of the graduated cylinder and the outer wall of the clutch cylinder, and the guide rails and sliders are circumferentially and uniformly arranged on the inner wall of the graduated cylinder and the outer wall of the clutch cylinder. Zero position limiting ribs and end limiting ribs for cooperating with the graduated cylinder are respectively provided at the upper end and the lower end of the outer wall of the clutch cylinder.

[0017] Further, considering that some medicine bottles have a large dose of medicine and can be injected in multiple times, the injection member of the present design further includes a large push rod. The push rod driving member is installed in the pen body. A positioning block or a positioning groove for cooperating with the pen body to prevent the push rod driving member from rotating and facilitating installation is provided on the side wall of the push rod driving member. A first driving ratchet is provided on the push rod driving member. A first driving ratchet tooth for cooperating with the first driving ratchet is provided at the lower end of the large push rod. A driving external thread is provided on the small push rod, and a driving internal thread for cooperating with the small push rod is provided on the push rod driving member. The push rod driving member is threadedly connected to the small push rod. The lower end of the small push rod passes through the large push rod and the push rod driving member and is connected with a push handle and a rubber stopper for conveniently extruding the medicine bottle. A rib groove for cooperating with the small push rod is provided in the large push rod. A second driving ratchet tooth is provided on the large push rod. A second driving ratchet is provided at the lower end of the clutch cylinder. During dose setting, the clutch cylinder is positioned at the first axial position of the clutch cylinder. There is a gap of about 0.2 mm between the lower end of the clutch cylinder and the large push rod. The second driving ratchet and the second driving ratchet tooth are not engaged. At this time, when the knob rotates forward and backward, the forward and backward rotation of the clutch cylinder is independent. The torsion spring can accumulate energy along with the forward rotation of the clutch cylinder at this time; during injection, the clutch cylinder is positioned at the second axial position of the clutch cylinder. The lower end of the clutch cylinder is connected to the large push rod. The second driving ratchet and the second driving ratchet tooth are engaged. The stored energy of the torsion spring is released, driving the clutch cylinder to rotate counterclockwise. At this time, the clutch cylinder is already connected to the large push rod, driving the large push rod to rotate counterclockwise. The rib groove in the large push rod drives the small push rod to move spirally downward counterclockwise, conducting the force to the push handle and pushing the rubber stopper downward for injection. After the injection is completed, the clutch cylinder returns to be positioned at the first axial position of the clutch cylinder, and the clutch cylinder is separated from the large push rod, and so on, until the small push rod reaches the bottom and cannot be injected, completing the injection of the whole bottle of medicine. Wherein, a flexible ratchet arm is provided at the lower end of the large push rod, the first driving ratchet tooth is arranged on the outer end face of the flexible ratchet arm, and a cut-off surface is provided on the first driving ratchet tooth so that the large push rod can only rotate relative to the push rod driving member in one direction (counterclockwise). In this way, when the first driving ratchet and the first driving ratchet tooth are engaged and rotate, the flexible ratchet arm keeps jumping on the ratchet surface, and a "click" injection reminder sound will be emitted.

[0018] Further, the injection member further includes a memory member. The inner wall of the memory member is threadedly connected to the small push rod. The outer wall of the memory member is slidably connected to the inner wall of the clutch cylinder. The inner wall of the clutch cylinder is provided with a slide rail for cooperating with the memory member. The memory member is movably mounted on the small push rod up and down. The lower end surface of the memory member is provided with an assembly portion that fits the large push rod. The top of the small push rod is provided with a cut-off portion that cooperates with the upper end surface of the memory member. When setting the dose, the clutch cylinder is positioned at the first axial position of the clutch cylinder. The lower end surface of the memory member fits the large push rod. The knob drives the jumping teeth and the clutch cylinder to rotate clockwise. The clutch cylinder drives the memory member to move spirally upward along the small push rod. During this process, the torsion spring stores energy. During this process, the clutch cylinder and the large push rod are in a state of not being engaged. The knob is screwed clockwise to the required scale. When injecting, press down the top cap to release the torsion spring. During the downward pressing process, the clutch cylinder engages with the large push rod. After engagement, the clutch cylinder separates from the jumping teeth, releasing the energy stored in the torsion spring. When the torsion spring returns, it drives the large push rod to rotate counterclockwise. The large push rod drives the small push rod to move spirally downward, pushing the push handle to inject, driving the memory member to return to the assembly position of the large push rod. When the memory member contacts the large push rod, a "pop" sound of injection completion can be emitted. This process is repeated until the small push rod reaches the end and gets stuck with the memory member and cannot inject, completing the injection of the whole bottle of medicine. At this time, the knob can no longer rotate.

[0019] Further, the pen body includes an upper pen body and a lower pen body that are connected to each other. The lower pen body includes a pen core holder and a pen cap. A cartridge vial is installed in the pen core holder. The upper end of the pen core holder is snap-fitted or threadedly connected to the upper pen body. The pen cap is detachably sleeved on the pen core holder. The pen cap is also provided with a pen clip for convenient carrying.

[0020] This solution also discloses a jumping tooth, which is a one-way ratchet. It includes a tooth body. A spring arm is provided on the tooth body. The spring arm is inclined downward. A jumping ratchet tooth is provided at the lower end of the spring arm. This one-way ratchet adopts a spring arm and a jumping ratchet tooth structure that are inclined downward, which is very convenient in production and assembly applications.

[0021] Further, the upper and lower ends of the spring arm are both provided with an arc transition at the connection with the tooth body and the jumping ratchet tooth. In this way, the connection of the spring arm is not prone to excessive stress and breakage, and has good fatigue resistance and service life.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The dose setting and sound generating structure of the present design and the supporting torsion spring automatic syringe have a compact structure. The jumping tooth is stuck with the knob, and the fitting clearance between the jumping tooth and the clutch tooth is small. The structure is compact and the fitting degree is good, which can greatly reduce the external volume of the syringe product. Moreover, the knob, the clutch tooth and the jumping tooth can all be made of plastic, which is convenient for production and assembly and has a light weight. The clutch tooth and the jumping tooth adopt a ratchet tooth fit arranged axially up and down, and the elastic force of the elastic arm itself is used to maintain the engagement between the jumping ratchet tooth and the clutch tooth ring, so that the force required to turn the knob to adjust the dose is smaller, improving the user's operation feel. The jumping tooth of the present design adopts a structure of an elastic arm and a jumping ratchet tooth arranged obliquely downward, which is convenient for both production and assembly applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 FIG. is an exploded view of the structure of a dose setting and sound generating structure of the present invention;

[0024] Figure 2 FIG. is a schematic cross-sectional view of the assembled structure of a dose setting and sound generating structure of the present invention;

[0025] Figure 3 FIG. is a schematic diagram of the assembled structure of the knob and the jumping tooth of the present invention;

[0026] Figure 4 and Figure 5 FIGS. are respectively schematic diagrams of the structures of the clutch tooth and the jumping tooth of the present invention;

[0027] Figure 6 FIG. is a schematic cross-sectional view of the assembled structure of the torsion spring automatic syringe of the present invention;

[0028] Figure 7 FIG. is an assembled drawing of the structure of the small push rod of the present invention;

[0029] Figure 8 FIG. is a schematic cross-sectional view of the structure of the upper pen body of the present invention;

[0030] Figure 9 FIG. is an assembled drawing of the structure of the push rod driving member of the present invention;

[0031] Figures 10 - 12 FIGS. are respectively schematic diagrams of the structures of the push rod driving member, the memory member and the large push rod of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the following specific embodiments are only representative specific embodiments of the present invention. Among them, the specific methods, devices, conditions, materials, etc. exemplified are not used to limit the present invention or the corresponding specific embodiments.

[0033] In addition, in the text, the terms "lower", "lower end", and "lower part" refer to the end towards the injection needle, and "upper", "upper end", and "upper part" refer to the opposite direction, i.e., the end towards the release button.

[0034] A dose setting sound generating structure, such as Figures 1 - 5 As shown, it includes a knob 31, a clutch tooth 32, and a ratchet tooth 33. Among them, the ratchet tooth 33 adopts one of the above-mentioned one-way ratchet structures. The upper end surface of the clutch tooth 32 is provided with a clutch ratchet tooth ring 321. The ratchet tooth 33 is arranged above the clutch tooth 32, and the ratchet tooth 33 is sleeved inside the knob 31. The ratchet tooth 33 and the knob 31 are respectively provided with a first component and a second component that cooperate with each other. The first component can be a card slot or a block or other structures with a contact surface arranged on the ratchet tooth 33, etc. The second component can be a block or a card slot or other structures with a contact surface arranged on the knob 31 that cooperate with the ratchet tooth 33, etc. The principle is that the first component and the second component come into contact with each other to form a connection to achieve the purpose of transmitting the rotational torque. In this embodiment, the specific embodiment is described with the ratchet tooth 33 and the knob 31 being respectively provided with a rotating card slot 332 and a rotating block 312 that cooperate with each other. The two ends of the rotating card slot 332 are respectively provided with a forward rotation blocking part and a reverse rotation blocking part. The ratchet tooth 33 is provided with the elastic arm 333. The lower end of the elastic arm 333 extends out of the lower end surface of the ratchet tooth 33, and the lower end of the elastic arm 333 is provided with the ratchet tooth 331. The ratchet tooth 331 can be engaged with the clutch ratchet tooth ring 321. The side wall of the knob 31 is also provided with an adjusting convex block 313. The adjusting convex block 313 is placed below the elastic arm 333. When the knob 31 rotates forward, the forward rotation blocking part blocks the rotating block 312 so that the knob 31 and the ratchet tooth 33 can rotate synchronously, and the ratchet tooth 331 slides on the clutch ratchet tooth ring 321. When the knob 31 rotates reversely, the adjusting convex block 313 presses against the elastic arm 33. The lower end of the elastic arm 33 is lifted by the adjusting convex block 313, and the ratchet tooth 331 is separated from the clutch ratchet tooth ring 321, so that the ratchet tooth 33 can rotate freely in reverse.

[0035] Furthermore, the tooth profiles of the beating ratchet 331 and the clutch ratchet ring 321 are such that the forward rotation surface is inclined and the reverse rotation surface is vertical. When the beating ratchet 331 is fully engaged with the clutch ratchet ring 321, the vertically arranged reverse rotation surface prevents the beating tooth from freely reversing; when the knob 31 rotates forward, the forward rotation stop portion blocks the rotating block 312, and the knob 31 and the beating tooth 33 rotate synchronously. During forward rotation, due to the elastic force of the elastic arm 333, the beating ratchet 331 slides on the clutch ratchet ring 321. Since the elastic arm has elasticity, after the beating ratchet 331 finishes engaging with a tooth block of the clutch ratchet ring 321, it will fall into another tooth groove. Thus, the continuous engagement of the beating ratchet 331 and the clutch ratchet ring 321 causes the beating ratchet 331 to continuously jump between the tooth tips and tooth grooves of the clutch ratchet ring 321. The end face engagement and collision of the beating ratchet 331 and the clutch ratchet ring 321 will produce a relatively loud "clicking" forward rotation reminder sound. During forward rotation, the beating tooth 33 will drive the connected injection member to rotate forward synchronously to accumulate energy and set the dose. When the knob 31 rotates in reverse, the beating ratchet 331 and the clutch ratchet ring 321 first remain engaged. Since the rotating block 312 can rotate a certain angle in the rotating slot 332, during reverse rotation, the adjusting convex block 313 presses upward against the elastic arm 333. When the knob 31 rotates in reverse by a certain angle, the lower end of the elastic arm 33 will be lifted by the adjusting convex block 313, causing the beating ratchet 331 to disengage from the clutch ratchet ring 321. There is sufficient space between the reverse rotation stop portion and the forward rotation stop portion for the rotating block 312 to fully rotate in reverse so that the adjusting convex block 313 can lift the elastic arm 333 to achieve the effect of separating the beating ratchet from the clutch ratchet. The reverse rotation surface cut-off ability of the clutch ratchet ring 321 for the beating ratchet 331 fails, so that the beating tooth 33 can freely reverse due to the energy accumulated by the connected injection member. During reverse rotation, due to the elastic force of the elastic arm, the beating ratchet 331 and the clutch ratchet ring 321 will resume full engagement every time they reverse one tooth. Continuing to rotate the knob 31 in reverse will continue to cause the adjusting convex block 313 to push open the elastic arm 333. Thus, during the repeated reverse rotation process, the end face collision of the beating ratchet 331 and the clutch ratchet ring 321 will also produce a relatively loud "clicking" reverse rotation reminder sound. During reverse rotation, the injection member dissipates energy and drives the beating tooth to reverse synchronously.

[0036] Further, a number of first positioning blocks 322 and a number of second positioning blocks 323 are provided on the clutch tooth 32. The first positioning blocks 322 are axially arranged ribs. Radial positioning portions for restricting the radial rotation of the clutch tooth are provided on the left and right sides of the first positioning block 322, and a first axial positioning portion for restricting the axial movement of the clutch tooth is provided at the bottom of the first positioning block 322. The second positioning blocks 323 are elastic bumps. An inclined installation portion is provided at the bottom of the second positioning block 323, and a second axial positioning portion for restricting the axial movement of the clutch tooth 32 is provided on the upper end surface of the second positioning block 323. This facilitates the installation of the clutch tooth onto the pen body of the syringe.

[0037] Further, the lower end surface of the jumping tooth 33 corresponding to the rotation card slot 332 is inclined, and the upper end surface of the rotation card block 312 is also inclined. This facilitates the downward sleeving of the jumping tooth 33 into the knob 31.

[0038] Further, a number of concave-convex patterns 311 for facilitating screwing are provided on the outer side surface of the knob 31.

[0039] Further, the elastic arm 333 is inclined downward. The connections between the upper and lower ends of the elastic arm 333 and the jumping tooth 33 and the jumping ratchet tooth 331 are both provided with arc transitions. In this way, the connections of the elastic arm 33 are not prone to excessive stress and breakage, and have good fatigue resistance and service life.

[0040] Further, a connecting ratchet 334 or a connecting key slot is provided on the jumping tooth 33 to connect the injection member.

[0041] Further, the upper end surface of the adjusting convex block 313 is provided with an arc shape that matches the lower end surface of the elastic arm 333. In this way, the cooperation between the clutch tooth 32, the jumping tooth 33 and the knob 31 is closer, the activities between the structures are smoother, and the use feel is improved.

[0042] The dose setting sound generating structure of this embodiment is overall lightweight. The jumping tooth 33 and the knob 31 are stuck together. The cooperation gap between the jumping tooth 33 and the clutch tooth 32 is small. The structure is compact and the cooperation degree is good. It can greatly reduce the external shape volume of the syringe product. Moreover, the knob 31, the clutch tooth 32 and the jumping tooth 33 can all be made of plastic, which is convenient for production and assembly. The clutch tooth 33 and the jumping tooth 44 adopt axially upper and lower arranged ratchet tooth cooperation, and the elastic force of the elastic arm itself is used to maintain the engagement of the jumping ratchet tooth and the clutch tooth ring. The force required to turn the knob 31 to adjust the dose is small, and the user has a good use feel.

[0043] This embodiment also discloses a torsion spring automatic syringe applying the above dose setting sound generating structure, as Figures 6 to 12As shown, it includes a pen body, which is composed of an upper pen body 11 and a lower pen body that are connected to each other. The lower pen body includes a pen core holder 12 and a pen cap. A cartridge vial is installed in the pen core holder 12. The upper end of the pen core holder 12 is snap-connected or thread-connected to the upper pen body 11. A connecting thread for connecting an injection needle is provided at the lower end of the pen core holder 12. The pen cap is detachably sleeved on the pen core holder 12, and elastic buckles that cooperate with each other can be provided between the pen core holder 12 and the pen cap for positioning. The upper pen body 11 is provided with an injection member and a dose setting member.

[0044] The injection member includes a release button 21, a clutch cylinder 22, a small push rod 23, a torsion spring 24, a push rod driving member 25, a release spring 26, a large push rod 27, and a memory member 28. The dose setting member includes a knob 31, a clutch tooth 32, and a jumping tooth 33. The knob 31 is rotatably mounted at the upper end of the upper pen body 11. The clutch tooth 32 is snap-fitted in the upper pen body 11 and cannot rotate. The jumping tooth 33 is snap-fitted inside the knob 31. The upper end surface of the clutch tooth 32 is provided with a clutch ratchet ring 321. The jumping tooth 33 is provided with a spring arm 333. The lower end of the spring arm 333 extends out of the lower end surface of the jumping tooth 33, and the lower end of the spring arm 333 is provided with a jumping ratchet 331 that meshes with the clutch ratchet ring 321. The upper end of the clutch cylinder 22 passes through the clutch tooth 32 and the jumping tooth 33. The upper end of the clutch cylinder 22 is connected to the jumping tooth 33 by a ratchet (in other embodiments, a key connection can also be used) to achieve synchronous rotation. The clutch cylinder 22 and the jumping tooth 33 can move axially up and down to achieve separation. The lower end of the release button 21 is provided with a guide rod 211. The guide rod 211 extends into the upper end of the clutch cylinder 22. The release button 21 is mounted on the upper end of the clutch cylinder 22 through the guide rod 211 and can move up and down. The upper end of the release button 21 extends out of the upper end of the knob 31 for easy pressing. An anti-detachment buckle that cooperates with each other is provided between the guide rod 211 and the clutch cylinder 22. The release spring 26 is disposed inside the knob 31. The two ends of the release spring 26 respectively abut and connect the release button 21 and the clutch tooth 32 (it can also be the knob 31 or the pen body). The release spring 31 provides a spring force to keep the clutch cylinder 22 positioned at the first clutch cylinder axial position. The push rod driving member 25 is mounted inside the lower end of the upper pen body 11. The side wall of the push rod driving member 25 is provided with a positioning block or positioning groove 251 that cooperates with the pen body of the upper pen body 11 to prevent the push rod driving member 25 from rotating and facilitate installation. A groove is provided in the middle of the push rod driving member 25. The inner wall of the groove is provided with a first driving ratchet 252. The lower end of the large push rod 27 is placed on the end surface of the groove. The lower end bearing side wall of the large push rod 27 is provided with a first driving ratchet 271 that cooperates with the first driving ratchet 252. The small push rod 23 is provided with an external driving thread. The push rod driving member 25 is provided with an internal driving thread that cooperates with the small push rod 23. The push rod driving member 25 is threadedly connected to the small push rod 23. The lower end of the small push rod 23 passes through the large push rod 27 and the push rod driving member 25 and is connected with a push handle and a rubber stopper that are convenient for extruding the medicine bottle. A rib groove 272 that cooperates with the small push rod 23 is provided inside the large push rod 27. The large push rod 27 is further provided with a second driving ratchet 273. The lower end of the clutch cylinder 22 is provided with a second driving ratchet 221 that cooperates with the second driving ratchet 273.The inner wall of the memory member 28 is threadedly connected to the small push rod 23. The outer wall of the memory member 28 is slidably connected to the inner wall of the clutch cylinder 22. The outer wall of the memory member 28 is provided with a slider rib 281, and the inner wall of the clutch cylinder 22 is provided with a slide rail that cooperates with the slider rib 281. The memory member 28 is movably mounted on the small push rod 23 in the up and down direction. The lower end surface of the memory member 28 is provided with an assembly portion that fits the large push rod 27, and the top of the small push rod 23 is provided with a cut-off portion that cooperates with the upper end surface of the memory member 28.

[0045] During dose setting, the clutch cylinder 22 is positioned at the first clutch cylinder axial position. The anti-detachment buckle between the guide rod 211 and the clutch cylinder 22 is in contact and cooperation with each other. There is a release gap between the lower end surface of the release button 21 and the upper end surface of the clutch cylinder 22. There is a gap of about 0.2 mm between the lower end of the clutch cylinder 22 and the large push rod 27. The second driving ratchet 221 and the second driving ratchet tooth 273 are not engaged. At this time, when the knob 31 rotates forward and backward, the forward and backward rotation of the clutch cylinder 22 is independent. The torsion spring can accumulate energy along with the forward rotation of the clutch cylinder 22 at this time. At this time, the lower end surface of the memory member 28 fits the upper end surface of the large push rod 27. When the knob 31 drives the jumping tooth 33 to rotate forward through the rotating block 312, the jumping ratchet tooth 331 slides on the clutch ratchet tooth ring 321. The upper end of the clutch cylinder 22 is connected to the jumping tooth 33 and can rotate synchronously with the jumping tooth 33 and the torsion spring 24. The clutch cylinder 22 drives the memory member 28 to move upward along the small push rod 23. During this process, the torsion spring 24 accumulates energy. When the desired set dose is reached, the rotation of the knob is stopped. The jumping ratchet tooth 331 is fully engaged with the clutch ratchet tooth ring 321. The reverse surface of the jumping ratchet tooth 331 perpendicular to the clutch ratchet tooth ring 321 makes the jumping tooth unable to rotate freely in the reverse direction. When the knob rotates in the reverse direction, when the jumping ratchet tooth 331 is separated from the clutch ratchet tooth ring 321, the restrictive effect of the clutch ratchet tooth ring 321 on the jumping ratchet tooth 331 disappears. The energy accumulated by the torsion spring 34 can actively drive the clutch cylinder 22 and the jumping tooth 33 to rotate synchronously in the reverse direction to dissipate energy. When the clutch cylinder 22 rotates, it will also drive the memory member 28 to move downward along the small push rod 23.

[0046] Press the release button 21 to move downward along the guide rod 211. The anti - detachment buckle between the guide rod 211 and the clutch cylinder 22 is separated from each other. After the lower end face of the release button 21 contacts the upper end face of the clutch cylinder 22, it can push the clutch cylinder 22 to be positioned at the second clutch cylinder axial position. The upper end of the clutch cylinder 22 is separated from the beating tooth 33, and the lower end of the clutch cylinder 22 is connected to the large push rod 27. The second driving ratchet and the second driving ratchet tooth are engaged. At this time, the stored energy of the torsion spring 24 is released, driving the clutch cylinder 22 to rotate counterclockwise. Since the clutch cylinder 22 is already connected to the large push rod 27 at this time, it drives the large push rod 27 to rotate counterclockwise. The rib groove in the large push rod 27 drives the small push rod 23 to move spirally downward counterclockwise, conducting the force to the push handle 25, pushing the rubber stopper downward for injection, and then pushing out the extrusion medicine bottle to inject the medicine. When the small push rod 23 moves spirally downward counterclockwise, it drives the memory member 28 to reset to the assembly position of the large push rod 27. When the memory member 28 contacts the large push rod 27, it can emit a "pop" sound to indicate the completion of injection.

[0047] After the injection is completed, release the release button 21. Due to the action of the release spring 26, after the anti - detachment buckle between the guide rod 211 and the clutch cylinder 22 comes into contact and cooperates with each other, it will drive the clutch cylinder 22 to resume positioning at the first clutch cylinder axial position. Except that the position of the small push rod 23 in the push rod driving member 25 remains in the post - injection state, the rest of the components return to the state at the time of dose setting. Repeat the dose setting and injection many times until the small push rod 23 reaches the end and gets stuck with the memory member 28 and cannot inject anymore, completing the injection of the whole bottle of medicine. At this time, the knob 31 can no longer be rotated.

[0048] Furthermore, the dose - setting member further includes a scale cylinder 34. The inner wall of the scale cylinder 34 is slidably connected up and down with the outer wall of the clutch cylinder 22. The outer wall of the scale cylinder 34 is provided with a spiral slide rail, and the inner wall of the upper pen body 11 is provided with a block that cooperates with the slide rail. The outer wall of the scale cylinder 34 is spirally slidably connected with the inner wall of the upper pen body. In this way, when the clutch cylinder 22 drives the scale cylinder 34 to rotate synchronously, the scale cylinder 34 rotates and moves up and down continuously under the combined action of the outer wall and the inner wall. By cooperating with the window on the upper pen body 11, the set injection volume can be accurately judged. Among them, a number of mutually - cooperating guide rails and sliders are provided on the inner wall of the scale cylinder 34 and the outer wall of the clutch cylinder 22. The guide rails and sliders are circumferentially and evenly arranged on the inner wall of the scale cylinder 34 and the outer wall of the clutch cylinder 22. The upper end and the lower end of the outer wall of the clutch cylinder 22 are respectively provided with a zero - position limiting rib and a termination limiting rib that cooperate with the scale cylinder 34.

[0049] Further, a flexible ratchet arm 274 is provided at the lower end of the large push rod 27, and the first driving ratchet teeth 271 are arranged on the outer end face of the flexible ratchet arm 274. A stop surface is provided on the first driving ratchet teeth 271 so that the large push rod can only rotate relative to the push rod driving member 25 in one direction (counterclockwise). Thus, when the first driving ratchet wheel 252 and the first driving ratchet teeth 271 are engaged and rotated, the flexible ratchet arm 274 keeps bouncing on the ratchet surface, generating a "clicking" injection reminder sound.

[0050] Further, a pen clip is also provided on the pen cap for convenient carrying.

[0051] The torsion spring automatic syringe of this embodiment has a simple structure, is very convenient for production and installation, easy to operate, and convenient to carry. Its overall structure is compact and scientific in cooperation, and the movement is smooth. Using the torsion spring as the driving force for injection improves the convenience and comfort of medication, can quickly and stably complete the injection process, and is suitable for popularization and application. Its dose setting component adopts a knob, clutch teeth and jumping teeth, and the desired dose is adjusted by rotating the knob forward and backward. Since the elastic force of the torsion spring is stable and controllable, the dose adjustment mechanism can achieve high-precision dose setting, thus ensuring the accuracy of the injection dose. In addition, the elastic characteristics of the torsion spring make the injection pen more stable during use, reducing the injection deviation caused by external force interference. The elastic characteristics of the torsion spring also enable the dose adjustment mechanism to automatically reset after use, improving the reliability and service life of the injection pen. During the forward and reverse rotation process, the jumping teeth and clutch teeth will cooperate to generate a prompt sound during the adjustment process, which is convenient for users to use. The clutch cylinder, large push rod and push rod driving member of its injection component adopt internal tooth clutch. When not released, the clutch cylinder and the large push rod are not engaged, which does not affect the screwing operation during dose setting. The combination of the large push rod, memory member and push rod driving member enables the syringe to inject multiple times to complete the injection of a whole bottle of medicine, and a prompt sound can also be emitted during the injection process, which is convenient for users to use.

[0052] This embodiment also discloses a jumping tooth structure, as Figure 5As shown, it includes a tooth body. The tooth body is tubular. The inner diameter of the upper end of the inner wall of the tooth body is smaller than that of the lower end of the inner wall of the tooth body. The upper end of the inner wall of the tooth body is used to set a connecting part for connecting a driving part. A hollowed-out part is provided at the lower end of the tooth body. A circular elastic arm 333 is provided at the hollowed-out part, which rotates around the center of the circle. The elastic arm 333 is arranged obliquely downward. A beating ratchet 331 is provided at the lower end of the elastic arm 333. Among them, the upper and lower ends of the elastic arm 333 are both arranged with arc transitions at the joints with the tooth body and the beating ratchet 331. In this way, the joints of the elastic arm 333 are not easily broken due to excessive stress, and have good fatigue resistance and service life. This one-way ratchet uses an elastic arm and a beating ratchet structure arranged obliquely downward, and it can be integrally formed by an injection molding process using a plastic material, which is very convenient in production, assembly and application. The elastic arm 333 is usually strip-shaped or arc-shaped, has certain elasticity and flexibility, and can be bent or deformed to adapt to different usage requirements. This design enables the elastic arm 333 to deform when subjected to external forces, so as to play a role in buffering, fixing or adjusting.

[0053] The above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention description still fall within the scope covered by the patent of the present invention.

Claims

1. The dosage adjustment sounding structure includes a clutch tooth, a jumping tooth and a knob, characterized in that: The beating tooth is arranged above the clutch tooth, and the beating tooth sleeve is arranged on the inner side of the knob, and the beating tooth and the knob are respectively provided with a first component and a second component that cooperate with each other; the beating tooth is also provided with an elastic arm, the lower end of the elastic arm extends out of the lower end surface of the beating tooth and is provided with a beating ratchet, the upper end surface of the clutch tooth is provided with a clutch ratchet ring that cooperates with the beating ratchet, and the side wall of the knob is also provided with an adjusting protrusion, and the adjusting protrusion is placed below the elastic arm; when the knob rotates forward, the first component and the second component cooperate with each other so that the knob and the beating tooth can rotate synchronously, and the beating ratchet slides on the clutch ratchet ring to adjust the dose; when the knob is reversed, the adjusting protrusion clamps the elastic arm to separate the beating ratchet from the clutch ratchet ring.

2. The dose adjustment sounding structure according to claim 1, characterized in that: The tooth shapes of the jumping ratchet and the clutch ratchet ring are that the positive rotation surface is an inclined surface and the reverse rotation surface is a vertical surface.

3. A dose adjustment sounding structure according to claim 1 or 2, characterized in that: The clutch tooth is provided with a first positioning block and a second positioning block, the left and right sides of the first positioning block are provided with radial positioning parts for limiting the radial rotation of the clutch tooth, the bottom of the first positioning block is provided with a first axial positioning part for limiting the axial movement of the clutch tooth, the bottom of the second positioning block is provided with an inclined mounting part, and the upper end surface of the second positioning block is provided with a second axial positioning part for limiting the axial movement of the clutch tooth.

4. The dose adjustment sounding structure according to claim 1, characterized in that: The outer side surface of the knob is provided with a plurality of concave and convex patterns.

5. The dose adjustment sound-generating structure according to claim 1, characterized in that: The jumping teeth are provided with a connecting ratchet or a connecting keyway.

6. The dose adjustment sound emitting structure according to claim 1, characterized in that: The lower end surface of the jumping tooth corresponding to the rotating clamping groove is inclined, and the upper end surface of the rotating clamping block is also inclined.

7. The dose adjustment sound-generating structure according to claim 1, characterized in that: The upper end surface of the adjusting protrusion is arranged in an arc shape to match the lower end surface of the elastic arm.

8. Torsion spring automatic injector, characterized in that: The invention comprises a pen body, wherein the pen body is provided with a medicine bottle, an injection component and a dosage adjustment sounding structure as described in any one of claims 1 to 7, wherein the injection component comprises a release button, a clutch cylinder, a small push rod, a release spring, a torsion spring and a push rod driving member, wherein the clutch tooth is fixedly mounted on the upper end of the pen body, the knob is rotatably mounted on the upper end of the pen body, the release button is mounted on the upper end of the clutch cylinder, the release spring is arranged in the knob, the two ends of the release spring respectively contact and connect the release button and the pen body, and the release spring positions the clutch cylinder in the first The clutch cylinder has an axial position; when the dose is set, the clutch cylinder is positioned at the first axial position of the clutch cylinder, the upper end of the clutch cylinder is connected to the jumping tooth and can rotate synchronously with the jumping tooth and the torsion spring; pressing the release button can push the clutch cylinder to be positioned at the second axial position of the clutch cylinder, the upper end of the clutch cylinder is separated from the jumping tooth and the torsion spring is released to drive the clutch cylinder to rotate, and when the clutch cylinder rotates, it drives the small push rod to rotate, and the push rod driving member converts the rotational torque of the small push rod into an axial propulsion force, thereby pushing out the squeezed medicine bottle to inject the medicine.

9. The torsion spring automatic injector according to claim 8, characterized in that: The injection component also includes a large push rod, and the push rod driving member is installed in the pen body. The side wall of the push rod driving member is provided with a positioning block or a positioning groove that cooperates with the pen body to prevent the push rod driving member from rotating and facilitates installation. The push rod driving member is provided with a first driving ratchet, and the lower end of the large push rod is provided with a first driving ratchet that cooperates with the first driving ratchet. The small push rod is provided with a driving external thread, and the push rod driving member is provided with a driving internal thread that cooperates with the small push rod. The push rod driving member is threadedly connected with the small push rod, and the lower end of the small push rod passes through the large push rod and the push rod driving member and is connected with a push handle and a rubber plug that are convenient for squeezing the medicine bottle. The large push rod is provided with a first driving ratchet that cooperates with the The rib groove of the small push rod, the large push rod is provided with a second driving ratchet, and the lower end of the clutch cylinder is provided with a second driving ratchet. When the dose is set, the clutch cylinder is positioned in the axial position of the first clutch cylinder, and a gap is provided between the lower end of the clutch cylinder and the large push rod; when injecting, the clutch cylinder is positioned in the axial position of the second clutch cylinder, and the lower end of the clutch cylinder is connected with the large push rod, the second driving ratchet and the second driving ratchet are engaged, and the stored force of the torsion spring is released, driving the clutch cylinder to rotate counterclockwise. At this time, the clutch cylinder is connected with the large push rod, driving the large push rod to rotate counterclockwise, and the rib groove in the large push rod drives the small push rod to move counterclockwise spirally downward, transmits the force to the push handle, and pushes the rubber plug downward for injection.

10. Jumping tooth, characterized in that: It comprises a tooth body, on which an elastic arm is arranged, the elastic arm is arranged obliquely downward, and a jumping ratchet is arranged at the lower end of the elastic arm.

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