Dose-limiting assembly for injection
Patent Information
- Application Number
- PCT/CN2025/081487
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-18
- Filing Date
- 2025-03-10
- Publication Date
- 2026-08-27
Smart Images
Figure CN2025081487_27082026_PF_FP_ABST
Abstract
Description
A dose limiting component for injection Technical Field
[0001] This invention relates to the field of injection device technology, and more specifically, to a dosage limiting component for injection. Background Technology
[0002] With the development of technology, injection devices have made great strides, evolving from the initial syringes to insulin pumps, and now to high-precision injection pens. The accuracy and convenience of injection devices have been greatly improved.
[0003] Patent document CN116650763A discloses an automatic insulin pen, including an injection pen body, a detachable cartridge assembly, and a detachable pen cap. The cartridge assembly includes a cartridge and a cartridge containing the medication. The cartridge assembly is connected to the end of the injection pen body, and the cartridge assembly is covered with a pen cap. The lower part of the injection pen body is the pen body itself, with a dose adjustment knob on the top and an injection trigger button on the top. A spring is provided between the knob and the button. From the outside to the inside, the pen body consists of a shell, an indicator scale sleeve, a rotating sleeve, a torsion spring, and a screw. The upper inner side of the shell has an end cap, and the lower inner side of the shell has a rotating sleeve and a rear cover. The automatic insulin pen of this invention meets all design specifications for insulin injection pens, has a small exposed portion, and a simple appearance. The button-triggered injection method is convenient to operate.
[0004] Existing injection pens lack a dosage limiting component. During the final injection, the adjusted dosage may exceed the remaining amount of medication in the pen, leading to inaccurate dosage and potential harm to the patient's health.
[0005] Therefore, it is necessary to propose an injectable dose-limiting component to address the problems existing in the prior art. Summary of the Invention
[0006] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.
[0007] To address the aforementioned problems, this invention provides an injection dosage limiting component, including a dosage knob rotatably mounted on a storage spring assembly. A fixed gear is fixedly mounted on the upper part of the storage spring assembly, and a limiting gear is rotatably mounted inside the dosage knob. The limiting gear meshes with the fixed gear. When setting the dosage, the dosage knob rotates, causing the limiting gear to rotate. During injection, the positions of the limiting gear, the fixed gear, and the dosage knob remain unchanged. When the cumulative dosage set by the dosage knob reaches a predetermined maximum dosage, the limiting gear restricts the rotation of the dosage knob.
[0008] Preferably, the number of teeth on the limiting gear is less than the number of teeth on the fixed gear;
[0009] A baffle is fixedly installed on the lower end face of the limiting gear, and a stop block is fixedly installed on the lower end face of the fixed gear.
[0010] Preferably, the baffle includes a starting part and an ending part, and the dose set by the dosage knob is from zero dose to the complete injection of the drug solution, and the baffle rotates from the starting part to the ending part.
[0011] Preferably, when the dosage knob is used to set the dosage, the limiting gear rotates around its own center line X2 and revolves around the center line X1 of the syringe, with the center line X2 of the limiting gear being parallel to the center line X1 of the dosage knob.
[0012] In addition, the present invention provides a dosage limiting component for injection, wherein a dosage knob is rotatably mounted on a storage spring assembly, a fixing member is fixedly mounted on the storage spring assembly, a limiting gear is rotatably mounted inside the fixing member, the limiting gear is meshed with a stop gear, and the stop gear is coaxially mounted with the dosage knob. When the dosage is set, the dosage knob rotates, driving the limiting gear to rotate. During injection, the positions of the limiting gear, the stop gear, and the dosage knob remain unchanged. When the cumulative dosage set by the dosage knob reaches the predetermined maximum dosage, the limiting gear restricts the rotation of the dosage knob.
[0013] Preferably, a pulling tooth is fixedly provided on the inner wall of the dosage knob, and the pulling tooth is engaged with the limiting gear;
[0014] A limiting part is fixedly installed on the outer wall of the stop gear. When the dosage knob is set to reach the full dose of the drug injection, the limiting part engages with the limiting gear, restricting the dosage knob from setting the dosage.
[0015] Preferably, a damping protrusion is fixedly provided on the fixing member, and the damping protrusion contacts the tooth tip of the limiting gear.
[0016] In addition, the present invention provides a dosage limiting component for injection, wherein a dosage knob is rotatably mounted on a storage spring assembly, a gear seat is fixedly mounted on the storage spring assembly, a limiting gear is rotatably mounted inside the gear seat, and the rotation axis of the limiting gear does not coincide with the rotation axis of the dosage knob;
[0017] A pulling tooth is fixedly installed on the inner wall of the dosage knob, and the pulling tooth is engaged with the limit gear;
[0018] A blocking block is fixedly installed on the gear seat, and a limiting tooth is installed on the limiting gear.
[0019] Preferably, during the entire process from zero dose to complete drug injection, the limiting tooth rotates from one side of the blocking block to the other side and is blocked by the blocking block, preventing the limiting tooth from continuing to rotate.
[0020] Preferably, a limiting gear chamber is provided on the gear seat, the limiting gear is rotatably disposed in the limiting gear chamber, the blocking block is fixedly disposed on the edge of the bottom surface of the limiting gear chamber, and a cantilever is fixedly disposed on the inner wall of the limiting gear chamber, with the suspended end of the cantilever engaging with the limiting gear.
[0021] Compared with the prior art, the present invention has at least the following beneficial effects:
[0022] The injection dosage limiting component of the present invention includes a limiting gear between the storage spring assembly and the dosage knob. When the dosage knob rotates to the maximum dosage setting number of times, the limiting gear restricts the rotation of the dosage knob to prevent the set dosage during the last injection from exceeding the remaining dosage of the drug solution, thus preventing inaccurate drug dosage from harming the patient's health.
[0023] Other advantages, objectives and features of the present invention, including the injectable dose-limiting component described herein, will be apparent in part from the following description and in part from the understanding of those skilled in the art through study and practice of the invention. Attached Figure Description
[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:
[0025] Figure 1 is a schematic diagram of the structure of the injection dose limiting component disclosed in this invention;
[0026] Figure 2 is a schematic diagram of the structure of the fixed gear disclosed in this invention;
[0027] Figure 3 is a schematic diagram of the structure of the dosage knob and the limiting gear disclosed in this invention;
[0028] Figure 4 is a schematic diagram of the initial positions of the limiting gear and the fixed gear disclosed in this invention;
[0029] Figure 5 is a cross-sectional view of the termination positions of the limiting gear and the fixed gear disclosed in this invention.
[0030] Figure 6 is a schematic diagram of the working principle of the limiting gear and the fixed gear disclosed in this invention;
[0031] Figure 7 is a schematic diagram of the structure of the limiting gear disclosed in this invention, which is set on the fixing member;
[0032] Figure 8 is a schematic diagram of the structure of the limiting gear and the stop gear disclosed in this invention;
[0033] Figure 9 is a schematic diagram of the structure of the fastener disclosed in this invention;
[0034] Figure 10 is a schematic diagram of the dosage knob disclosed in this invention;
[0035] Figure 11 is a structural schematic diagram of the initial positions of the limiting gear and the stop gear disclosed in this invention;
[0036] Figure 12 is a schematic diagram of the termination position of the limiting gear and the stop gear disclosed in this invention;
[0037] Figure 13 is a cross-sectional structural schematic diagram of the fastener disclosed in this invention;
[0038] Figure 14 is a schematic diagram of the structure of the limiting gear disclosed in this invention, which is mounted on the gear seat.
[0039] Figure 15 is a schematic diagram of the structure of the gear seat and the limiting gear disclosed in this invention.
[0040] The components are as follows: 1. Dosage knob, 1-1. Pulling tooth, 2. Limiting gear, 2-1. Baffle, 2-3. Limiting tooth, 3. Force storage spring assembly, 4. Fixed gear, 5. Gear shaft, 7. Stop block, 7-1. Starting part, 7-2. Ending part, 8. Fixing part, 8-1. Damping protrusion, 9. Stop gear, 9-1. Limiting part, 10. Gear seat, 10-1. Blocking block, 10-2. Limiting gear chamber, 10-3. Cantilever, 11. Pen body. Detailed Implementation
[0041] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.
[0042] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.
[0043] As shown in Figures 1-13, the present invention provides an injection dosage limiting component, including a dosage knob 1, which is rotatably mounted on a power storage spring assembly 3. A fixed gear 4 is fixedly mounted on the upper part of the power storage spring assembly 3. A limiting gear 2 is rotatably mounted inside the dosage knob 1. The limiting gear 2 meshes with the fixed gear 4. When setting the dosage, the dosage knob 1 rotates, driving the limiting gear 2 to rotate. During injection, the positions of the limiting gear 2, the fixed gear 4, and the dosage knob 1 remain unchanged. When the cumulative dosage set by the dosage knob 1 reaches the predetermined maximum dosage, the limiting gear 2 restricts the rotation of the dosage knob 1.
[0044] Furthermore, the number of teeth on the limiting gear 2 is less than the number of teeth on the fixed gear 4;
[0045] A baffle 2-1 is fixedly installed on the lower end face of the limiting gear 2, and a stop block 7 is fixedly installed on the lower end face of the fixed gear 4.
[0046] Furthermore, the stop 7 includes a starting part 7-1 and an ending part 7-2. The dose set by the dose knob 1 is from zero dose to complete the entire process of drug injection. The baffle 2-1 rotates from the starting part 7-1 to the ending part 7-2.
[0047] Furthermore, when the dosage knob 1 sets the dosage, the limiting gear 2 rotates around its own center line X2 and revolves around the center line X1 of the syringe. The center line X2 of the limiting gear 2 is parallel to the center line X1 of the dosage knob 1.
[0048] In addition, the present invention provides a dosage limiting component for injection. The dosage knob 1 is rotatably mounted on the power storage spring assembly 3. A fixing member 8 is fixedly mounted on the power storage spring assembly 3. A limiting gear 2 is rotatably mounted inside the fixing member 8. The limiting gear 2 is meshed with a stop gear 9. The stop gear 9 is coaxially mounted with the dosage knob 1. When the dosage is set, the dosage knob 1 rotates, driving the limiting gear 2 to rotate. During injection, the positions of the limiting gear 2, the stop gear 9, and the dosage knob 1 remain unchanged. When the cumulative dosage set by the dosage knob 1 reaches the predetermined maximum dosage, the limiting gear 2 restricts the rotation of the dosage knob 1.
[0049] Furthermore, a pulling tooth 1-1 is fixedly provided on the inner wall of the dosage knob 1, and the pulling tooth 1-1 is engaged with the limiting gear 2;
[0050] A limiting part 9-1 is fixedly provided on the outer wall of the stop gear 9. When the dosage knob 1 is set to reach the full dose of the drug injection, the limiting part 9-1 engages with the limiting gear 2, limiting the dosage knob 1 to set the dose.
[0051] Furthermore, a damping protrusion 8-1 is fixedly provided on the component 8, and the damping protrusion 8-1 contacts the tooth tip of the limiting gear 2.
[0052] In addition, the present invention provides a dosage limiting component for injection, wherein a dosage knob 1 is rotatably mounted on a power storage spring assembly 3, a gear seat 10 is fixedly mounted on the power storage spring assembly 3, and a limiting gear 2 is rotatably mounted inside the gear seat 10, wherein the rotation axis of the limiting gear 2 does not coincide with the rotation axis of the dosage knob 1.
[0053] A pulling tooth 1-1 is fixedly installed on the inner wall of the dosage knob 1, and the pulling tooth 1-1 is engaged with the limiting gear 2;
[0054] A stop block 10-1 is fixedly installed on the gear seat 10, and a limit tooth 2-3 is installed on the limit gear 2.
[0055] Furthermore, as the dosage set by the dosage knob 1 progresses from zero dose to the complete injection of the drug solution, the limiting tooth 2-3 rotates from one side of the blocking block 10-1 to the other side and is blocked by the blocking block 10-1, preventing the limiting tooth 2-3 from continuing to rotate.
[0056] Furthermore, a limiting gear chamber 10-2 is provided on the gear seat 10, and the limiting gear 2 is rotatably disposed in the limiting gear chamber 10-2. The blocking block 10-1 is fixedly disposed on the edge of the bottom surface of the limiting gear chamber 10-2, and a cantilever 10-3 is fixedly disposed on the inner wall of the limiting gear chamber 10-2. The suspended end of the cantilever 10-3 is engaged with the limiting gear 2.
[0057] The working principle of the above technical solution:
[0058] To prevent the set dose from exceeding the remaining medication during the last injection, a limiting gear 2 is installed inside the dosage knob 1. When setting the dose, the dosage knob 1 rotates, causing the limiting gear 2 to rotate. During injection, the positions of the limiting gear 2 and the dosage knob 1 remain unchanged. When the cumulative dose set by the dosage knob 1 reaches the predetermined maximum dose, the limiting gear 2 limits the rotation of the dosage knob 1.
[0059] The limiting gear 2 is rotatably mounted inside the dosage knob 1. It can be mounted on a connecting plate that is perpendicular to the central axis of the dosage knob 1 and fixedly connected to the inner wall of the dosage knob 1. A gear shaft 5 is fixedly mounted on the connecting plate, and the limiting gear 2 is rotatably mounted on the gear shaft 5. The dosage knob 1 is rotatably mounted on the upper part of the storage spring assembly 3. The limiting gear 2 meshes with a fixed gear 4 fixedly mounted on the top of the storage spring assembly 3. The number of teeth of the limiting gear 2 is less than the number of teeth of the fixed gear 4. In the initial position, the baffle 2-1 contacts the starting part 7-1 of the stop block 7. When the dosage is set, as shown in Figures 4-5, the dosage knob 1 is rotated clockwise, and the limiting gear 1 rotates with the dosage knob 1. The limiting gear 2 rotates around its own center line X2 and revolves around the center line X1 of the syringe. Since the number of teeth of the limiting gear 2 is less than the number of teeth of the fixed gear 4, When the dosage knob 1 rotates one revolution, the limiting gear 2 rotates more than one revolution. The extra rotation angle prevents the baffle 2-1 from being blocked by the starting part 7-1 and allows it to rotate a certain angle more relative to the initial position. After the dosage knob 1 has rotated multiple revolutions for dosage setting, the baffle 2-1 rotates exactly to the ending part 7-2 and is blocked. Since the limiting gear 2 and the fixed gear 4 are meshed and the distance between their axes cannot change, after the baffle 2-1 is blocked by the ending part 7-2, the limiting gear 2 and the fixed gear 4 can no longer continue to rotate. The limiting gear 2 also prevents the dosage knob 1 from continuing to rotate through the gear shaft 5. Thus, when the set dosage reaches the expected maximum dosage (that is, the maximum injection dosage of the injection pen), the dosage knob 1 is prevented from continuing to set the dosage, which can prevent the dosage setting from exceeding the maximum injection dosage of the injection pen.
[0060] As shown in Figure 6, the limiting gear 2 and the fixed gear 4 mesh and limit each other. According to the gear meshing principle, the lengths of rotation of the limiting gear 2 and the fixed gear 4 along the pitch circle are equal when they rotate. Since the number of teeth of the limiting gear 2 is less than the number of teeth of the fixed gear 4, the pitch circle of the limiting gear 2 is smaller than the pitch circle of the fixed gear 4. That is, when the limiting gear 2 revolves around the fixed gear 4, the length of the pitch circle it travels is the same as the length of the pitch circle of the fixed gear 4. The limiting gear 2 needs to travel a distance greater than the length of one rotation of the pitch circle. The extra length is the distance that the baffle 2-1 moves relative to its previous position when the limiting gear 2 revolves once. This continues until the baffle 2-1 rotates to the termination part 7-2, at which point the outer limiting gear is blocked and stops moving.
[0061] After each dose setting, during injection, the position of the dose knob 1 and the power storage spring assembly 3 remains unchanged. The power storage spring assembly 3 is detachably connected to the pen body 11, and the position between the power storage spring assembly 3 and the pen body is fixed after installation.
[0062] The limiting gear 2 can also be set inside the fixing member 8, which is fixedly set on the top of the storage spring assembly 3. A stop gear 9 is rotatably set inside the fixing member 8, meshing with the limiting gear 2. The stop gear 9 is coaxially set with the dosage knob 1. The stop gear 9 can be limited by the inner cavity of the fixing member 8, or it can be rotatably set on the shaft of the transmission unit. A pulling tooth 1-1 is fixedly set on the inner wall of the dosage knob 1. When the dosage knob 1 is set, for each revolution, the pulling tooth 1-1 drives the limiting gear 2 to rotate by one tooth angle. In the initial position, as shown in Figure 10, the limiting part 9-1... One side of the limiting part contacts the limiting gear 2. Since the limiting part cannot mesh with the limiting gear 2, the limiting gear 2 cannot rotate counterclockwise. When setting the dose, the dose knob 1 rotates clockwise. Each rotation drives the limiting gear 2 to rotate by one tooth angle. After the dose knob 1 rotates multiple times, the limiting part 9-1 gradually moves away from the limiting gear 2 and approaches the limiting gear from the other side, as shown in Figure 11. When the limiting part 9-1 contacts the limiting gear 2, the limiting part 9-1 prevents the limiting gear 2 and the stop gear 9 from continuing to mesh. The two cannot continue to rotate, thereby preventing the dose knob 1 from continuing to rotate for dose setting.
[0063] A damping protrusion 8-1 is provided inside the fixing component 8. The damping protrusion 8-1 contacts the tooth tip of the limiting gear 2. After the dosage knob 1 is driven by the pulling tooth 1-1 to rotate the limiting gear 2 by an angle, the damping protrusion 8-1 plays a damping role on the limiting gear 2, preventing the limiting gear 2 from continuing to rotate due to inertia or external reasons, thus causing positional deviation.
[0064] The limiting gear 2 can also be rotatably mounted inside the gear seat 10, which is fixedly mounted on the top of the energy storage spring assembly 3. The limiting gear 2 is provided with limiting teeth 2-3, and the gear seat 10 is provided with a limiting gear chamber 10-2. A blocking block 10-1 is fixedly mounted on the edge of the bottom surface of the limiting gear chamber 10-2. In the initial position, the limiting teeth 2-3 are in contact with one side wall of the blocking block 10-1. When setting the dose, the dose knob 1 is rotated. Each rotation of the dose knob 1 drives the limiting gear 2 to rotate by one tooth angle. After multiple dose settings, after the dose knob 1 has rotated multiple times, the limiting teeth 2-3 are in contact with the other side wall of the blocking block 10-1 and are blocked. The limiting gear 2 can no longer rotate, and thus the dose knob 1 can no longer rotate, thereby restricting the dose knob from continuing to set the dose.
[0065] A cantilever 10-3 is installed inside the limiting gear chamber 10-2. The suspended end of the cantilever 10-3 is engaged with the limiting gear 2 to prevent the limiting gear 2 from continuing to rotate due to inertia or external reasons when it is not engaged with the pulling tooth 1-1. The cantilever 10-3 is made of elastic material. When setting the dosage, the limiting gear 2 can lift the cantilever 10-3 to rotate. After the limiting gear 2 rotates by one tooth angle, the cantilever 10-3 engages the limiting gear again.
[0066] The beneficial effects of the above technical solution are as follows:
[0067] The injection dosage limiting component of the present invention includes a limiting gear between the storage spring assembly and the dosage knob. When the dosage knob rotates to the maximum dosage setting number of times, the limiting gear restricts the rotation of the dosage knob to prevent the set dosage during the last injection from exceeding the remaining dosage of the drug solution, thus preventing inaccurate drug dosage from harming the patient's health.
[0068] In one embodiment, a sensor module is provided on the dosage knob 1. The sensor module includes a position sensor and a wireless transmission unit. The sensor is used to detect the number of rotations of the dosage knob 1. Multiple magnetic units are arranged in an array along the circumferential direction on the upper part of the outer circumferential surface of the force storage spring assembly 3. A magnetic sensor is provided on the dosage knob 1 at a position opposite to the magnetic units. When the dosage knob 1 rotates, the magnetic sensor scans through each magnetic unit. In the initial position, the magnetic sensor on the dosage knob 1 corresponds to the magnetic unit at position 0. The other magnetic units are evenly distributed and correspond to different angles. The number of magnetic units can be set as needed. When setting the dosage, the dosage knob 1 rotates. Each time it passes through the magnetic unit at position 0, it is considered that the dosage knob 1 has rotated one revolution. When the dosage setting is completed and the dosage knob 1 stops, the angle corresponding to the magnetic unit corresponding to the magnetic sensor is the angle when the dosage knob 1 has rotated less than one revolution. The processor converts the angle into a decimal value of the number of revolutions. During the next dose setting, the angle of the magnetic unit when the magnetic sensor rotates to the 0 position is converted into a decimal value of the number of revolutions. The processor records the dose value set each time based on the dose value corresponding to each revolution of the dose knob.
[0069] The wireless transmitting unit transmits the data of the number of rotations of the dosage knob 1 detected by the sensor to the terminal. The terminal is equipped with a processor and an alarm unit. The processor converts the number of rotations into dosage data and stores it in the storage unit according to the preset dosage corresponding to each rotation of the dosage knob. The processor also has a preset dosage prediction model. The dosage prediction model generates a predicted dosage based on the historical data stored in the storage unit. When setting the dosage before the next injection, the processor calculates the set dosage based on the real-time transmitted number of rotations of the dosage knob 1 and compares the set dosage with the predicted dosage. If the difference between the set dosage and the predicted dosage is within the threshold range, it indicates normal injection. If the difference between the set dosage and the predicted dosage exceeds the threshold range, the processor controls the alarm unit to sound an alarm, prompting the patient to check whether the set dosage is accurate.
[0070] The expression for the dose prediction model is:
[0071] S is the predicted dose, n is the number of historical data points, i is the range of values for the historical data, and f is the predicted dose.i S represents the weight of the i-th data point. i This refers to the dose data for the i-th historical data point.
[0072] The processor presets the total dose of the injection pen. After each injection, the set dose is recorded and summarized. The summed dose is added to the calculated predicted dose. When the summed value is close to or reaches the total dose, the next injection is determined to be the last injection. After detecting the dose set before the last injection, the previously summarized dose is added to the dose set at the last injection and compared with the preset total dose of the injection pen. If it exceeds the total dose of the injection pen, an alarm is triggered to prompt the patient to check the dose set value at the last injection.
[0073] The working principle of the above technical solution:
[0074] A sensor module is installed on the dosage knob 1. The sensor module includes a position sensor and a wireless transmission unit. The sensor is used to detect the number of rotations of the dosage knob 1. Multiple magnetic units are arranged in an array along the circumferential direction on the upper part of the outer circumferential surface of the force storage spring assembly 3. A magnetic sensor is installed on the dosage knob 1 at a position opposite to the magnetic units. In the initial position, the magnetic sensor on the dosage knob 1 corresponds to the magnetic unit at position 0. The other magnetic units are evenly distributed, corresponding to different angles. The number of magnetic units can be set as needed. When setting the dosage, the dosage knob 1 rotates. Each time it passes the magnetic unit at position 0, the magnetic sensor records one rotation. When the dosage setting is completed and the dosage knob 1 stops, the angle corresponding to the magnetic unit corresponding to the magnetic sensor is the angle when the dosage knob 1 has rotated less than one rotation. The processor converts the angle into a decimal value of the number of rotations. In the next dosage setting, the angle of the magnetic unit at position 0, which is then converted into a decimal value of the number of rotations, is recorded by the processor based on the dosage value corresponding to each rotation of the dosage knob.
[0075] The dosage of medication injected into a patient may vary depending on changes in their physical condition during medication use, such as increases or decreases. Sometimes patients forget to adjust the dosage before injection, or the dosage setting may be incorrect. Injecting the wrong dosage can have a significant impact on the patient's health. To address this, a cartridge-based injection pen can be used. For frequent injections, dosage setting data from multiple injections can be collected and stored in a storage unit. The processor assigns weights to each historical data point, with earlier data having lower weights and later data having higher weights. Based on the historical data and weights, a predicted dosage is calculated. When setting the dosage, the difference between the set dosage and the predicted dosage is compared.
[0076] The expression for the dose prediction model is:
[0077] S is the predicted dose, n is the number of historical data points, i is the range of values for the historical data, and f is the predicted dose. i S represents the weight of the i-th data point. i This refers to the dose data for the i-th historical data point.
[0078] The threshold range is ±0.02ml.
[0079] The terminal can be mounted on the pen, or it can be a mobile phone used by the patient.
[0080] The processor presets the total dose of the injection pen. After each injection, the set dose is recorded and summarized. The summed dose is added to the calculated predicted dose. When the summed value is close to or reaches the total dose, the next injection is determined to be the last injection. After detecting the dose set before the last injection, the previously summarized dose is added to the dose set at the last injection and compared with the preset total dose of the injection pen. If it exceeds the total dose of the injection pen, an alarm is triggered to prompt the patient to check the dose set value at the last injection.
[0081] After recording and calculating the total set dose for the last injection, the total value is reset to zero. After the patient replaces the vial, the processor restarts recording the total set dose.
[0082] The beneficial effects of the above technical solution are as follows:
[0083] It can prevent the limiting component from being damaged due to excessive force by the patient during the last injection, and prevent the dose set by the dose knob from exceeding the remaining medication. It accumulates and records the dose set each time to prevent the dose set during the last injection from exceeding the remaining medication.
[0084] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0085] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0086] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.
Claims
1. A dosage limiting component for injection, characterized in that, Includes a dosage knob (1), which is rotatably mounted on a power storage spring assembly (3). A fixed gear (4) is fixedly mounted on the upper part of the power storage spring assembly (3). A limiting gear (2) is rotatably mounted inside the dosage knob (1). The limiting gear (2) meshes with the fixed gear (4). When the dosage is set, the dosage knob (1) rotates, driving the limiting gear (2) to rotate. When injecting, the positions of the limiting gear (2), the fixed gear (4), and the dosage knob (1) remain unchanged. When the cumulative dosage set by the dosage knob (1) reaches the predetermined maximum dosage, the limiting gear (2) restricts the rotation of the dosage knob (1).
2. The injection dosage limiting component according to claim 1, characterized in that, The number of teeth of the limiting gear (2) is less than the number of teeth of the fixed gear (3); A baffle (2-1) is fixedly installed on the lower end face of the limiting gear (2), and a stop block (7) is fixedly installed on the lower end face of the fixing gear (3).
3. The injection dosage limiting component according to claim 2, characterized in that, The stop (7) includes a starting part (7-1) and an ending part (7-2). The dose set by the dose knob (1) is from zero dose to complete the entire process of drug injection. The baffle (2-1) rotates from the starting part (7-1) to the ending part (7-2).
4. The injection dosage limiting component according to claim 3, characterized in that, When the dosage knob (1) is used to set the dosage, the limiting gear (2) rotates around its own center line X2 and revolves around the center line X1 of the syringe. The center line X2 of the limiting gear (2) is parallel to the center line X1 of the dosage knob (1).
5. A dosage limiting component for injection, characterized in that, The dosage knob (1) is rotatably mounted on the power storage spring assembly (3). A fixing member (8) is fixedly mounted on the power storage spring assembly (3). A limiting gear (2) is rotatably mounted inside the fixing member (8). The limiting gear (2) meshes with the stop gear (9). The stop gear (9) is coaxially mounted with the dosage knob (1). When the dosage is set, the dosage knob (1) rotates, driving the limiting gear (2) to rotate. When injecting, the positions of the limiting gear (2), the stop gear (9), and the dosage knob (1) remain unchanged. When the cumulative dosage set by the dosage knob (1) reaches the predetermined maximum dosage, the limiting gear (2) restricts the rotation of the dosage knob (1).
6. The injection dosage limiting component according to claim 5, characterized in that, A pulling tooth (1-1) is fixedly installed on the inner wall of the dosage knob (1), and the pulling tooth (1-1) meshes with the limiting gear (2); A limiting part (9-1) is fixedly provided on the outer wall of the stop gear (9). When the dose knob (1) is set to reach the full dose of the drug injection, the limiting part (9-1) engages with the limiting gear (2) to limit the dose setting of the dose knob (1).
7. The injection dosage limiting component according to claim 6, characterized in that, A damping protrusion (8-1) is fixedly installed on the fixing member (8), and the damping protrusion (8-1) contacts the tooth tip of the limiting gear (2).
8. A dosage limiting component for injection, characterized in that, The dosage knob (1) is rotatably mounted on the power storage spring assembly (3), and a gear seat (10) is fixedly mounted on the power storage spring assembly (3). The limiting gear (2) is rotatably mounted inside the gear seat (10), and the rotation axis of the limiting gear (2) does not coincide with the rotation axis of the dosage knob (1). A pulling tooth (1-1) is fixedly installed on the inner wall of the dosage knob (1), and the pulling tooth (1-1) meshes with the limiting gear (2); A blocking block (10-1) is fixedly installed on the gear seat (10), and a limiting tooth (2-3) is installed on the limiting gear (2).
9. The injection dosage limiting component according to claim 8, characterized in that, As the dose set by the dose knob (1) is from zero to the complete injection of the drug solution, the limiting tooth (2-3) rotates from one side of the blocking block (10-1) to the other side and is blocked by the blocking block (10-1), preventing the limiting tooth (2-3) from continuing to rotate.
10. The injection dosage limiting component according to claim 9, characterized in that, A limiting gear chamber (10-2) is provided on the gear seat (10). The limiting gear (2) is rotatably disposed in the limiting gear chamber (10-2). The blocking block (10-1) is fixedly disposed on the edge of the bottom surface of the limiting gear chamber (10-2). A cantilever (10-3) is fixedly disposed on the inner wall of the limiting gear chamber (10-2). The suspended end of the cantilever (10-3) is engaged with the limiting gear (2).