A mistake-proof disposable insulin injection pen

Abstract

The application discloses a one-time insulin injection pen with anti-misoperation, and belongs to the technical field of medical devices. The one-time insulin injection pen comprises a pen body pipe, a dose rotating drum, a dose knob and a connecting buckle, a clutch rod and a clutch part. The dose rotating drum is in threaded connection with the pen body pipe. The connecting buckle is inserted into the dose rotating drum and is in clutch connection with the dose rotating drum at one end, and is located outside the dose rotating drum and is connected with the dose knob at the other end. The clutch rod is arranged in the dose rotating drum, the top end of the connecting buckle is buckled with the clutch rod, and the clutch rod is in clutch connection with the clutch part. During work, the dose knob is rotated to drive the dose rotating drum to move spirally, the connecting buckle and the clutch rod are axially displaced, the clutch rod is separated from the clutch part, and the dose adjusting state is entered. The dose knob is pressed to push the clutch rod to move forward and engage with the clutch part, and the injection driving state is entered. The single dose knob is used to realize the function switching of the dose adjusting and the injection state, the risk of mechanical jamming or dose precision deviation caused by the user's "rotating and pressing" is eliminated, and the reliability is improved.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a disposable insulin pen designed to prevent misoperation. Background Technology

[0002] As a widely used drug delivery device, the core function of an insulin pen is to allow users to accurately set the dose and reliably administer subcutaneous injections. Traditional insulin pens typically employ a separate operating mechanism, consisting of a separate dose adjustment knob (for rotating to set the injection unit) and a separate injection button (usually located at the end or side of the knob, for pressing to dispense insulin).

[0003] In this split design, dosage adjustment and injection drive are accomplished by two relatively independent mechanical sequences: when adjusting the dosage, the user rotates the dosage knob, which moves the dosage cylinder backward through the threaded mechanism, and at the same time drives the relevant internal transmission components to prepare the stroke; when injecting, the user needs to press the injection button, which will directly or indirectly drive the injection drive mechanism to push out the preset dose of liquid medicine.

[0004] However, the aforementioned traditional design presents a significant clinical use risk and structural reliability issue: mechanical interference and dosage errors due to misoperation. Because the adjustment knob and injection button are spatially adjacent but functionally separate, the user may unintentionally press the knob axially or accidentally press the adjacent injection button while rotating it to precisely set the dosage. This unintentional pressing will prematurely trigger the injection drive mechanism, leading to the following problems: 1. Mechanical jamming or damage: When the injection drive mechanism (such as clutch or push rod) is forcibly driven before the dosage is fully set or the internal transmission components are not aligned, mechanical interference is very likely to occur. In mild cases, it may cause parts to jam and the operation to feel stiff; in severe cases, it may damage the precision plastic gears, threads or clutch teeth, causing the entire device to fail.

[0005] 2. Impaired Dosage Accuracy: Even if no permanent damage is caused, accidental triggering can cause the internal transmission chain (such as screw, dosing cylinder) to be subjected to undue axial or radial stress, resulting in slight deformation or positional displacement. This "preloading" or "misalignment" will directly affect the advancement accuracy of the subsequent injection stage, causing the actual injection dose to deviate from the set dose, which poses a potential risk for insulin therapy that requires strict dose control. Summary of the Invention

[0006] This invention addresses the aforementioned problems in the prior art by proposing a disposable insulin pen that integrates the adjustment knob and injection button into one unit, preventing accidental operation.

[0007] This invention can be achieved through the following technical solutions: A disposable insulin pen designed to prevent accidental operation, comprising: Pen body; A dosage cylinder, wherein the dosage cylinder is disposed inside the pen body tube and the two are threadedly connected; The dosage knob and the connecting buckle are connected at one end, which is inserted into the dosage cylinder and the two are disengaged; the other end is located outside the dosage cylinder and is connected to the dosage knob. The clutch lever and clutch element are provided. The clutch lever is disposed inside the dosing cylinder and the two are engaged. The connecting buckle is inserted into the clutch lever and is fastened to the top end of the clutch lever. The bottom end of the clutch lever is engaged and disengaged with the clutch element. The dosage knob is configured as follows: When adjusting the injection dose, the dose knob is rotated to drive the dose cylinder to move spirally along the pen body tube, thereby driving the connecting buckle and the clutch lever to move axially synchronously. At this time, the clutch lever is separated from the clutch component, and the injection pen is in the dose adjustment state. During injection, pressing the dosage knob causes the connecting buckle to move the clutch lever. At this time, the clutch lever engages with the clutch element, and the injection pen enters the injection drive state.

[0008] As a further improvement of the present invention, the end of the dose cylinder facing the dose knob has a first meshing tooth arranged axially and distributed in a ring on its inner wall, and the outer end face of the connecting buckle has a first mating tooth, the first mating tooth meshing with the first meshing tooth.

[0009] As a further improvement of the present invention, a transmission sleeve is provided inside the pen tube. The transmission sleeve is sleeved outside the dosage cylinder. The inner wall of the transmission sleeve is provided with second meshing teeth that extend along its axial direction and are arranged in a ring. The outer wall of the clutch is provided with a plurality of outwardly protruding second mating teeth. The second mating teeth mesh with the second meshing teeth.

[0010] As a further improvement of the present invention, the inner wall of the clutch is provided with a third meshing tooth arranged in a ring along its axial direction, and the clutch rod is provided with a third mating tooth, the third mating tooth meshing with the third meshing tooth.

[0011] As a further improvement of the present invention, a positioning sleeve and a screw are also provided inside the pen body tube. The positioning sleeve is sleeved outside the transmission sleeve. A threaded seat is provided at the center of the end of the positioning sleeve. The screw is disposed inside the clutch rod. The screw passes through the threaded seat and the two are threadedly connected.

[0012] As a further improvement of the present invention, the screw is configured as a flat screw, and the end of the transmission sleeve is provided with a transmission seat. The transmission seat has a through hole for the screw to pass through, and the through hole is adapted to the shape of the screw.

[0013] As a further improvement of the present invention, a locking sleeve is also included. One end of the locking sleeve is located between the clutch rod and the screw. The locking sleeve and the dosage cylinder form a rotational engagement structure through the cooperation of the rib and the groove. The other end of the locking sleeve is mounted on the transmission seat and has a toothed locking surface. The toothed locking surface is unidirectionally skewed.

[0014] As a further improvement of the present invention, it also includes an adjustable sound-producing component, which is sleeved outside the locking sleeve. The adjustable sound-producing component has an adjustable sound-producing tooth and a one-way locking tooth. The adjustable sound-producing tooth cooperates with the second meshing tooth to form a rotating sound-producing structure, and the one-way locking tooth cooperates with the tooth-shaped locking surface to form a one-way rotating structure.

[0015] As a further improvement of the present invention, the outer peripheral surface of the threaded seat is provided with a toothed sound-generating surface that is unidirectionally inclined, and the end of the transmission sleeve is provided with an injection sound-generating tooth. The injection sound-generating tooth and the toothed sound-generating surface cooperate to form an injection sound-generating structure.

[0016] As a further improvement of the present invention, the pen body tube is composed of an integrally connected outer tube and an inner tube, the dosage cylinder is threadedly connected to the inner tube, a dosage marking tube is provided between the outer tube and the inner tube, one end of the dosage marking tube facing the dosage knob extends beyond the end face of the inner tube and is mounted on the dosage cylinder, and a spring is provided between the dosage knob and the dosage marking tube.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Pioneering "rotate and press in one, logic interlock" mechanism to completely eliminate the risk of misoperation: Abandoning the traditional separate knob and button design, it uses a single dose knob to switch between dose adjustment and injection status. When rotating to adjust the dose, the internal clutch lever automatically moves backward and physically separates from the drive end, structurally cutting off the injection path. This fundamentally eliminates the hidden dangers of mechanical jamming, gear breakage, or dose setting errors caused by users "rotating and pressing at the same time", significantly improving the safety and reliability of the device, and is especially suitable for elderly people with weak hand control.

[0018] 2. Construct a dual independent acoustic feedback system to achieve full-process visual monitoring: During the adjustment phase, the unidirectional locking tooth and the oblique tooth surface are used to provide clear incremental confirmation and prevent dose backflow; during the injection phase, the tooth shape of the transmission sleeve and the fixed thread seat are used to convert the drug pushing action into discrete "click" pulse signals. This feedback mechanism not only allows users to confirm the current status in real time through hearing and touch, but also improves the ease of operation and user experience.

[0019] 3. Optimized "static memory, dynamic release" transmission chain to ensure high-precision dosage output: During the dosage setting stage, the locking sleeve and the dosage cylinder remain relatively stationary through the cooperation of the ribs and grooves. As the dosage cylinder rotates around the stationary screw, it generates a specific axial displacement, precisely "writing" the dosage memory using the relative displacement between the locking sleeve and the screw. During the injection execution stage, pressing the button causes the clutch lever to engage with the fixed clutch, establishing a drive chain from the dosage cylinder to the transmission sleeve and then to the screw. This forces the screw to rotate and axially feed relative to the stationary locking sleeve, thereby "releasing" the memory and propelling the liquid medication through the relative displacement between the screw and the locking sleeve, completing the full injection of the set dosage. This process, combined with the precise cooperation between the flat screw and the transmission seat, efficiently converts the user's pressing force into a uniform helical thrust. This design completely eliminates transmission gaps and the risk of idling, ensuring a high degree of linear consistency between the set dosage and the actual injected dosage.

[0020] 4. Integrated spring linkage and floating display structure improves assembly accuracy and operating feel: The design of the dosage indicator tube extending beyond the end face of the inner tube and directly mounted on the dosage drum, combined with the pre-tightening spring in the knob, not only eliminates axial wobbling of the display component to ensure clear readings, but also cleverly utilizes the spring force to automatically pull the clutch lever to move synchronously during adjustment. This design simplifies the complex linkage mechanism, realizes the automatic and precise engagement and reset of the clutch, greatly reduces assembly difficulty and cost, and at the same time gives users a smooth and tactile operating experience.

[0021] 5. Optimized structure for single-use scenarios, balancing high reliability and low-cost manufacturing: The structural design eliminates the complex transmission mechanism of traditional reusable pens while ensuring reliability for single use. This ensures that the pen can withstand the high thrust required for injection without plastic deformation or slippage during its single lifespan, thus ensuring the accuracy of dosage output. It also simplifies the complexity of parts, reduces mold costs and assembly time, and perfectly meets the special requirements of single-use medical devices for injection accuracy and cost control, achieving the best balance between performance and economy. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the insulin injection pen of the present invention; Figure 2 This is a cross-sectional view of the pen body tube of the present invention; Figure 3 This is a schematic diagram of the connecting buckle of the present invention; Figure 4 This is a schematic diagram of the dosing cylinder of the present invention; Figure 5 This is a schematic diagram of the dosage rotating cylinder from another perspective of the present invention; Figure 6 This is a schematic diagram of the clutch lever of the present invention; Figure 7 This is a schematic diagram of the transmission sleeve of the present invention; Figure 8 This is a schematic diagram of the transmission sleeve of the present invention from another perspective; Figure 9 This is a schematic diagram of the clutch component of the present invention; Figure 10 This is a schematic diagram of the positioning sleeve of the present invention; Figure 11 This is a schematic diagram of the locking sleeve of the present invention; Figure 12 This is a schematic diagram of the structure of the adjustable sound-producing teeth of the present invention; Figure 13 This is a schematic diagram of the screw structure of the present invention.

[0023] In the diagram, 100 is the pen body tube; 101 is the outer tube; 102 is the inner tube; 110 is the dosage cylinder; 111 is the first engaging tooth; 112 is the groove; 120 is the dosage knob; 121 is the spring; 130 is the connecting buckle; 131 is the first mating tooth; 140 is the clutch lever; 141 is the second mating tooth; 150 is the clutch element; 151 is the third engaging tooth; 160 is the transmission sleeve; and 161 is the second engaging tooth. 162. Gear; 163. Transmission seat; 170. Injection sound-generating tooth; 171. Positioning sleeve; 171. Threaded seat; 1711. Toothed sound-generating surface; 180. Screw; 190. Locking sleeve; 191. Rib; 192. Toothed locking surface; 200. Adjusting sound-generating component; 201. Adjusting sound-generating tooth; 202. One-way locking tooth; 210. Dosage marking tube; 220. Pen refill holder; 221. Injection piston. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figures 1-13 As shown, the present invention provides a disposable insulin pen to prevent accidental operation, comprising: Pen body 100; A dose-dispensing cylinder 110 is disposed inside the pen body tube 100 and the two are threadedly connected. The dosage knob 120 and the connecting buckle 130 are connected. One end of the connecting buckle 130 is inserted into the dosage cylinder 110 and the two are engaged and disengaged. The other end is located outside the dosage cylinder 110 and is connected to the dosage knob 120. The clutch lever 140 and the clutch element 150 are arranged inside the dosage drum 110 and the two are engaged. The connecting buckle 130 is inserted into the clutch lever 140 and is engaged with the top end of the clutch lever 140. The bottom end of the clutch lever 140 is engaged with the clutch element 150. The dosage knob 120 is configured as follows: When adjusting the injection dose, the dose knob 120 is rotated to drive the dose cylinder 110 to move spirally along the pen body tube 100, thereby driving the connecting buckle 130 and the clutch lever 140 to move axially synchronously. At this time, the clutch lever 140 is separated from the clutch 150, and the injection pen is in the dose adjustment state. During injection, pressing the dosage knob 120 causes the connecting buckle 130 to move the clutch lever 140. At this time, the clutch lever 140 engages with the clutch component 150, and the injection pen enters the injection drive state.

[0026] The core of this solution lies in completely reconstructing the traditional insulin pen's separate architecture of "knob as knob and button as button," and creatively proposing a single-component control mechanism of "rotation and pressing as one, with logical interlocking."

[0027] In traditional designs, if the user's hand is unstable and applies force axially when rotating to set the dosage, it can easily cause the internal transmission chain to engage prematurely or become misaligned, leading to mechanical jamming or dosage errors.

[0028] This invention utilizes the dosage knob 120 as the sole interactive interface, cleverly leveraging the vector differences in the direction of motion to differentiate functions: The rotational motion (torque) is converted into a spiral backward displacement of the dosage drum 110. During this process, the internal clutch lever 140 moves backward synchronously with the drum, actively increasing the distance between itself and the front fixed clutch 150 until it separates from the clutch 150. This completely cuts off the injection drive path in physical space, making accidental triggering impossible. Only when the dosage is set and the user applies a clear axial pressure, the connecting buckle 130 pushes the clutch lever 140 forward until the toothed structure at its bottom precisely engages with the clutch 150. At this point, the rotation channel is locked, and the power transmission path switches to the injection propulsion mode.

[0029] This design fundamentally eliminates the risk of mechanical interference caused by "rotating and pressing simultaneously," achieving physical-level error prevention for the operational logic. Overall, compared to existing technologies, this application has at least the following advantages: It completely eliminates mechanical jamming, gear damage, and dosage accuracy deviation caused by user misoperation (such as accidentally pressing the button when adjusting the dosage), significantly improving the safety and structural reliability of the device during use, while simplifying the user's operation steps, making it more suitable for the elderly.

[0030] Preferably, the end of the dosing cylinder 110 facing the dosing knob 120 has a first meshing tooth 111 arranged axially and distributed in a ring on its inner wall, and the outer end face of the connecting buckle 130 has a first mating tooth 131, which meshes with the first meshing tooth 111.

[0031] This structure forms the torque transmission interface between the dosage knob 120 and the internal transmission system. When the user rotates the knob, the first mating tooth 131 and the first meshing tooth 111 mesh tightly, transmitting the rotational torque to the dosage cylinder 110 without loss, causing it to retract precisely along the threaded trajectory. In the initial stage of injection pressing, the connecting buckle 130 can produce a slight axial slide relative to the dosage cylinder 110 to drive the clutch lever 140 forward and engage with the clutch element 150. After engagement, the clutch lever 140 and the dosage cylinder 110 advance synchronously to transmit the injection thrust.

[0032] This design ensures the rigidity and precision of the transmission during the dosage setting process, avoiding inaccurate dosage setting due to slippage. At the same time, it clearly distinguishes between the relative sliding during the injection triggering phase and the rigid transmission during the drug delivery phase, ensuring both the sensitivity of the trigger and the structural stability under high thrust, thus enhancing the overall durability of the structure.

[0033] Preferably, the pen body tube 100 is further provided with a transmission sleeve 160, which is sleeved on the outside of the dosage rotating cylinder 110. The inner wall of the transmission sleeve 160 is provided with second meshing teeth 161 that extend along its axial direction and are arranged in a ring. The outer wall of the clutch 150 is provided with a plurality of outwardly protruding second mating teeth 141, which mesh with the second meshing teeth 161.

[0034] This design establishes a radial limit for the clutch 150, and the transmission sleeve 160 is fixed inside the pen tube 100 and does not rotate. The longitudinal grooves on its inner wall restrict the circumferential freedom of the mating teeth on the outer wall of the clutch 150, forcing the clutch 150 to not rotate with the dosage cylinder 110. This prevents the clutch 150 from undergoing unnecessary rotational movement with the cylinder during dosage adjustment, ensuring the tooth alignment accuracy of the clutch rod 140 and the clutch 150 when they are axially connected, avoiding engagement failure due to angular deviation, and ensuring smooth injection triggering.

[0035] Preferably, the inner wall of the clutch 150 is provided with a third engagement tooth 151 arranged in a ring along its axial direction, and the clutch lever 140 is provided with a third mating tooth. The third mating tooth engages with the third engagement tooth 151. This is the key locking interface for realizing the switching of the "injection drive state". In the dose adjustment state, the clutch lever 140 moves backward, and the third mating tooth and the third engagement tooth 151 are completely separated, and the power chain is broken. In the injection state, the clutch lever 140 moves forward, and the two sets of tooth structures are deeply engaged to form a rigid connection, which directly transmits the axial thrust generated by pressing to the subsequent drug delivery mechanism. This design provides a highly reliable engagement method to ensure that the injection pen can be smoothly switched between the dose adjustment state and the injection state.

[0036] Preferably, the pen body tube 100 is further provided with a positioning sleeve 170 and a screw 180. The positioning sleeve 170 is sleeved outside the transmission sleeve 160. A threaded seat 171 is provided at the center of the end of the positioning sleeve 170. The screw 180 is disposed in the clutch rod 140. The screw 180 passes through the threaded seat 171 and the two are threadedly connected. This component constitutes the core screw drive pair for injection propulsion. The positioning sleeve 170 is fixed and stationary. The screw 180 is linked with the clutch rod 140. When the clutch rod 140 is pressed and engaged, the continued pressure or the energy released by the internal spring 121 drives the screw 180 to rotate forward in the threaded seat 171, thereby pushing the piston rod to squeeze out the liquid medicine.

[0037] This method utilizes the high mechanical gain characteristic of threaded transmission to convert the user's small pressing force into a large pushing force, while ensuring the uniformity and stability of the pushing speed.

[0038] Preferably, the screw 180 is configured as a flat screw 180, and the end of the transmission sleeve 160 is provided with a transmission seat 162. The transmission seat 162 has a through hole for the screw 180 to pass through, and the through hole is adapted to the shape of the screw 180. Thus, during injection, as the transmission sleeve 160 and its rotating seat rotate, the screw 180 can be driven to rotate. Since the transmission sleeve 160 always rotates in its original position, and the screw 180 is threadedly connected to the threaded seat 171, the screw 180 can move forward spirally to realize the injection action of the insulin pen.

[0039] This structure ingeniously transforms the rotational motion of the transmission sleeve 160 into the linear propulsion motion of the screw 180. The shape of the flat screw 180 and the through-hole of the transmission seat 162 are matched to achieve efficient torque transmission. Simultaneously, the threaded engagement between the screw 180 and the fixed threaded seat 171 precisely converts the rotational displacement into axial travel. This "rotational drive, linear output" mechanism not only provides significant mechanical gain to overcome injection resistance and ensure smooth and uniform drug delivery, but also eliminates the risk of screw 180 idling through structural limiting, significantly improving the linearity and control precision of the dosage output, and ensuring accurate dosage for each injection.

[0040] Preferably, it also includes a locking sleeve 190, one end of which is located between the clutch rod 140 and the screw 180. The locking sleeve 190 and the dosage cylinder 110 form a rotational engagement structure through the cooperation of the rib 191 and the groove 112. The locking sleeve 190 serves as the core transmission component for dosage memory and execution, and its working process is divided into two independent stages: "dosage setting (memory writing)" and "injection execution (memory release)". The specific principle is as follows: 1. Dosage setting phase (static memory establishment): When the user rotates the dosage knob 120 to adjust the dosage, the dosage cylinder 110 spirals backward along the axis, directly driving the locking sleeve 190 to rotate around the stationary screw 180 and generate a specific axial displacement. At this time, the relative displacement generated between the locking sleeve 190 and the screw 180 strictly corresponds to the set insulin dosage unit, thus forming the "mechanical memory" of the dosage.

[0041] It should be noted that it is precisely because the locking sleeve 190 remains stationary relative to the screw 180 (without rotation or axial displacement) during the subsequent injection process that the dose memory state is reliably locked and unaffected by external interference.

[0042] 2. Injection execution phase (dynamic memory accumulation of injected dose): When the user presses the dosage knob 120, the clutch lever 140 first moves forward axially and engages with the fixed clutch component 150. At this time, since the clutch lever 140 and the dosage cylinder 110 are always in an engaged state, the clutch lever 140, the dosage cylinder 110 and the clutch component 150 form a synchronously locked whole.

[0043] Under this linkage mechanism, the rotational motion of the dosage cylinder 110 is transmitted to the clutch lever 140, which is always engaged with it. The clutch lever 140, through engagement with the clutch element 150, drives the transmission sleeve 160 to rotate, indirectly forcing the screw 180 to rotate (i.e., simultaneously rotate and feed axially). At the same time, since the locking sleeve 190 and the dosage cylinder 110 are kept in rotational engagement through the rib 191 and the groove 112, the movement of the dosage cylinder 110 forces the locking sleeve 190 and the screw 180 to perform synchronous helical motion until the locking sleeve 190 moves axially to abut against the bottom surface of the transmission sleeve 160, thereby completing the injection of the set dose.

[0044] Furthermore, the other end of the locking sleeve 190 is mounted on the transmission seat 162 and has a toothed locking surface 192. The toothed surface of the locking surface 192 is unidirectionally oblique. Correspondingly, it also includes an adjusting sound-producing element 200, which is sleeved outside the locking sleeve 190. The adjusting sound-producing element 200 has adjusting sound-producing teeth 201 and unidirectional locking teeth 202. The adjusting sound-emitting tooth 201 and the second meshing tooth 161 cooperate to form a rotating sound-emitting structure. When adjusting the dosage, the adjusting sound-emitting element 200 rotates with the knob, and its one-way locking tooth 202 slides along the gentle slope of the tooth surface of the locking sleeve 190 to allow positive increment. At the same time, its adjusting sound-emitting tooth 201 and the fixed second meshing tooth 161 periodically mesh to produce a clear "click" sound and segmented feel. The one-way locking tooth 202 and the tooth-shaped locking surface 192 cooperate to form a one-way rotation structure. Once an attempt is made to rotate in the opposite direction, the one-way locking tooth 202 is rigidly blocked by the steep side of the tooth surface, thereby preventing dose loss.

[0045] This structure highly integrates one-way locking and acoustic feedback functions into the engagement between the adjusting sound-emitting element 200 and the oblique toothed locking sleeve 190. It not only utilizes the one-way oblique characteristic of the toothed surface to ensure that the dosage cylinder 110 will not rotate accidentally, but also provides accurate auditory counting and tactile segment feedback through the double meshing structure, which significantly improves the accuracy of operation and user experience. At the same time, it simplifies the transmission chain, enhances the rigidity of the mechanism, and ensures the stability and durability of the device under long-term high-frequency use.

[0046] Preferably, the outer peripheral surface of the threaded seat 171 is provided with a toothed sound-generating surface 1711 that is unidirectionally inclined, and the end of the transmission sleeve 160 is provided with an injection sound-generating tooth 163. The injection sound-generating tooth 163 and the toothed sound-generating surface 1711 cooperate to form an injection sound-generating structure.

[0047] Specifically, during the injection execution phase, when the user presses the button to drive the internal mechanism, the transmission sleeve 160 rotates, and the injection sound-generating teeth 163 at its end slide across the outer circumferential surface of the threaded seat 171 fixed inside the pen body, passing over the tooth surface in sequence and generating periodic "click" vibrations and sounds, thus forming the injection sound-generating structure.

[0048] This process converts the continuous pushing motion of the screw 180 into discrete pulse signals. Each injection of a unit dose (or a specific stroke) triggers a sound and tactile feedback until the injection is complete. If a blockage causes the transmission sleeve 160 to stop moving, the sound will stop immediately, thus reflecting the injection status in real time.

[0049] This structure enables real-time visualization (auditory) monitoring of the injection process by setting an independent dynamic sound generation mechanism along the injection path. The clear "click" sound and segmented tactile feedback directly prove that the screw 180 is advancing and the liquid is flowing out.

[0050] Furthermore, by separating "injection sound" from the aforementioned "adjustment sound," the two stages of adjustment and injection have independent and distinctive feedback signals, avoiding user confusion about the operation status and improving the overall logical clarity of the interaction.

[0051] Preferably, the pen body tube 100 is composed of an outer tube 101 and an inner tube 102 integrally connected. The dosage cylinder 110 is threadedly connected to the inner tube 102. A dosage indicator tube 210 is provided between the outer tube 101 and the inner tube 102. One end of the dosage indicator tube 210 facing the dosage knob 120 extends beyond the end face of the inner tube 102 and is mounted on the dosage cylinder 110. A spring 121 is provided between the dosage knob 120 and the dosage indicator tube 210. During the dosage adjustment process, the spring 121 can provide a pulling force for the clutch lever 140 to move synchronously.

[0052] The structure ensures overall rigidity and coaxiality through the integrated pen body tube 100. The unique design of the dosage marking tube 210 extending beyond the end face of the inner tube 102 and directly mounted on the dosage rotating cylinder 110 facilitates dosage administration for the user. At the same time, it cleverly converts the axial force generated by the spring 121 during dosage adjustment into the power to drive the clutch lever 140 to move synchronously. This achieves reliable automatic engagement and reset of the clutch mechanism without the need for additional complex transmission components, simplifying the internal transmission chain and reducing assembly difficulty and cost.

[0053] Preferably, it also includes a cartridge holder 220, which is connected to the pen body tube 100 to form the structure of the insulin pen. The cartridge holder 220 is used to install the injection drug and the injection piston 221. The screw 180 pushes the injection piston 221 forward to push the drug outward and complete the injection action.

[0054] The technical means disclosed in this invention are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0056] Furthermore, in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] The technical solutions of the various embodiments of the present invention can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0058] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A disposable insulin pen designed to prevent misoperation, characterized in that, include: Pen body; A dosage cylinder, wherein the dosage cylinder is disposed inside the pen body tube and the two are threadedly connected; The dosage knob and the connecting buckle are connected at one end, which is inserted into the dosage cylinder and the two are disengaged; the other end is located outside the dosage cylinder and is connected to the dosage knob. The clutch lever and clutch element are provided. The clutch lever is disposed inside the dosing cylinder and the two are engaged. The connecting buckle is inserted into the clutch lever and is fastened to the top end of the clutch lever. The bottom end of the clutch lever is engaged and disengaged with the clutch element. The dosage knob is configured as follows: When adjusting the injection dose, the dose knob is rotated to drive the dose cylinder to move spirally along the pen body tube, thereby driving the connecting buckle and the clutch lever to move axially synchronously. At this time, the clutch lever is separated from the clutch component, and the injection pen is in the dose adjustment state. During injection, pressing the dosage knob causes the connecting buckle to move the clutch lever. At this time, the clutch lever engages with the clutch element, and the injection pen enters the injection drive state.

2. The disposable insulin pen for preventing misoperation according to claim 1, characterized in that, The end of the dosing cylinder facing the dosing knob has a first meshing tooth arranged axially and distributed in a ring on its inner wall, and the outer end face of the connecting buckle has a first mating tooth, which meshes with the first meshing tooth.

3. The disposable insulin pen for preventing misoperation according to claim 1, characterized in that, The pen body tube is also provided with a transmission sleeve, which is sleeved outside the dosage cylinder. The inner wall of the transmission sleeve is provided with a second meshing tooth that extends along its axis and is arranged in a ring. The outer wall of the clutch is provided with a plurality of outwardly protruding second mating teeth, which mesh with the second meshing tooth.

4. The disposable insulin pen for preventing misoperation according to claim 1, characterized in that, The inner wall of the clutch is provided with a third meshing tooth arranged in a ring along its axial direction, and the clutch rod is provided with a third mating tooth, which meshes with the third meshing tooth.

5. A disposable insulin pen for preventing misoperation according to claim 3, characterized in that, The pen body tube is also provided with a positioning sleeve and a screw. The positioning sleeve is sleeved outside the transmission sleeve. A threaded seat is provided at the center of the end of the positioning sleeve. The screw is located inside the clutch rod. The screw passes through the threaded seat and the two are threadedly connected.

6. A disposable insulin pen for preventing misoperation according to claim 5, characterized in that, The screw is configured as a flat screw, and the end of the transmission sleeve is provided with a transmission seat. The transmission seat has a through hole for the screw to pass through, and the through hole is adapted to the shape of the screw.

7. A disposable insulin pen for preventing misoperation according to claim 5, characterized in that, It also includes a locking sleeve, one end of which is located between the clutch rod and the screw. The locking sleeve and the dosage cylinder form a rotational engagement structure through the cooperation of the rib and the groove. The other end of the locking sleeve is mounted on the transmission seat and has a toothed locking surface. The toothed locking surface is unidirectionally skewed.

8. A disposable insulin pen for preventing misoperation according to claim 7, characterized in that, It also includes an adjustable sound-producing component, which is sleeved outside the locking sleeve. The adjustable sound-producing component has an adjustable sound-producing tooth and a one-way locking tooth. The adjustable sound-producing tooth cooperates with the second meshing tooth to form a rotating sound-producing structure, and the one-way locking tooth cooperates with the tooth-shaped locking surface to form a one-way rotating structure.

9. A disposable insulin pen for preventing misoperation according to claim 3, characterized in that, The outer circumferential surface of the threaded seat is provided with a toothed sound-generating surface that is unidirectionally inclined, and the end of the transmission sleeve is provided with an injection sound-generating tooth. The injection sound-generating tooth and the toothed sound-generating surface cooperate to form an injection sound-generating structure.

10. A disposable insulin pen for preventing misoperation according to claim 1, characterized in that, The pen body tube is composed of an integrally connected outer tube and an inner tube. The dosage cylinder is threadedly connected to the inner tube. A dosage indicator tube is provided between the outer tube and the inner tube. One end of the dosage indicator tube facing the dosage knob extends beyond the end face of the inner tube and is mounted on the dosage cylinder. A spring is provided between the dosage knob and the dosage indicator tube.

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