Dose limiting assembly for injection

Abstract

The invention discloses an injection dose limiting assembly which comprises a dose knob, the dose knob is rotatably arranged on a force storage spring assembly, a fixed gear is fixedly arranged on the upper portion of the force storage spring assembly, a limiting gear is rotatably arranged in the dose knob, and the limiting gear is meshed with the fixed gear. The dose knob rotates to drive the limiting gear to rotate, during injection, the positions of the limiting gear, the fixed gear and the dose knob are kept unchanged, and when the dose accumulated and set by the dose knob reaches the preset maximum dose, the limiting gear limits rotation of the dose knob. According to the dosage limiting assembly for injection, the limiting gear is arranged between the force storage spring assembly and the dosage rotary knob, when the dosage rotary knob rotates to the maximum dosage set number of turns, the limiting gear limits rotation of the dosage rotary knob, and the situation that the set dosage exceeds the residual dosage of liquid medicine during last injection is prevented; and the harm to the health of a patient caused by inaccurate injected dose is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of injection devices, and more particularly to a dose limiting component for injection. Background Art

[0002] With the development of science and technology, injection equipment has made great progress. From the initial syringe to the later insulin pump, and then to the current high-precision injection pen, the accuracy and convenience of injection equipment have been greatly improved.

[0003] Patent document CN116650763A discloses an automatic insulin injection pen, including an injection pen body, a detachable medicine chamber assembly, and a detachable pen cap; the medicine chamber assembly includes a medicine chamber and a cartridge bottle containing medicine; the end of the injection pen body is connected to the medicine chamber assembly, and the outer cover of the medicine chamber assembly is provided with a pen cap; the lower part of the injection pen body is the pen body, the upper part of the pen body is provided with a knob for adjusting the dosage, the top of the pen body is provided with a button for stimulating injection, and a spring is provided between the knob and the button; the pen body is provided with a shell, an indicating scale sleeve, a rotating sleeve, a torsion spring, and a screw from the outside to the inside, the upper inner side of the outer shell of the pen body is provided with an end cap, and the lower inner side of the outer shell is provided with a rotating sleeve and a back cover. The automatic insulin injection pen of the present invention meets the various design specifications of the insulin injection pen, and the exposed part is small and the appearance is simple; the button is used to trigger the injection, which is convenient to operate.

[0004] The injection pen in the prior art does not have a dose limiting component. During the last injection, the adjusted dose will exceed the remaining amount of medicine in the injection pen, resulting in an inaccurate amount of medicine injected, which may cause harm to the patient's health.

[0005] Therefore, it is necessary to propose a dose limiting component for injection to solve the problems existing in the prior art. Summary of the invention

[0006] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0007] In order to solve the above problems, the present invention provides a dose limiting assembly for injection, including a dose knob, which is rotatably arranged on a force storage spring assembly, a fixed gear is fixedly arranged on the upper part of the force storage spring assembly, a limit gear is rotatably arranged inside the dose knob, and the limit gear is meshed with the fixed gear. When setting the dose, the dose knob rotates to drive the limit gear to rotate. When injecting, the positions of the limit gear, the fixed gear and the dose knob remain unchanged. When the cumulative dose set by the dose knob reaches a predetermined maximum dose, the limit gear limits the rotation of the dose knob.

[0008] Preferably, the number of teeth of the limiting gear is smaller than the number of teeth of the fixed gear;

[0009] A baffle is fixedly arranged on the lower end surface of the limiting gear, and a stopper is fixedly arranged on the lower end surface of the fixed gear.

[0010] Preferably, the baffle comprises a starting portion and a stopping portion, and the baffle rotates from the starting portion to the stopping portion during the entire process from zero dose to the complete injection of the medicinal solution set by the dose knob.

[0011] Preferably, when the dose knob is used to set the dose, the limit gear rotates around its own center line X2 and revolves around the center line X1 of the syringe, and the center line X2 of the limit gear is parallel to the center line X1 of the dose knob.

[0012] In addition, the present invention provides a dose limiting assembly for injection, wherein a dose knob is rotatably arranged on a force storage spring assembly, a fixing piece is fixedly arranged on the force storage spring assembly, a limit gear is rotatably arranged in the fixing piece, the limit gear is meshed with a stop gear, the stop gear is coaxially arranged with the dose knob, when the dose is set, the dose knob rotates to drive the limit gear to rotate, when injecting, the positions of the limit gear, the stop gear and the dose knob remain unchanged, and when the cumulative dose set by the dose knob reaches a predetermined maximum dose, the limit gear limits the rotation of the dose knob.

[0013] Preferably, a pulling tooth is fixedly arranged on the inner wall of the dosage knob, and the pulling tooth is meshed with the limit gear;

[0014] A limiting part is fixedly arranged on the outer wall of the stop gear. When the dosage knob reaches the full dosage of the liquid medicine injection, the limiting part is engaged with the limiting gear to limit the dosage knob to set the dosage.

[0015] Preferably, a damping protrusion is fixedly provided on the fixing member, and the damping protrusion is in contact with the tooth top of the limiting gear.

[0016] In addition, the present invention provides a dose limiting assembly for injection, wherein the dose knob is rotatably arranged on the force storage spring assembly, a gear seat is fixedly arranged on the force storage spring assembly, a limit gear is rotatably arranged in the gear seat, and a rotation axis of the limit gear does not coincide with a rotation axis of the dose knob;

[0017] A pull-out tooth is fixedly arranged on the inner wall of the dosage knob, and the pull-out tooth is meshed with the limit gear;

[0018] A blocking block is fixedly arranged on the gear seat, and a limiting tooth is arranged on the limiting gear.

[0019] Preferably, during the entire process from zero dose to complete injection of the drug solution, the limit tooth rotates from one side of the blocking block to the other side and is blocked by the blocking block so that the limit tooth cannot continue to rotate.

[0020] Preferably, a limit gear chamber is provided on the gear seat, the limit gear is rotatably provided in the limit gear chamber, the blocking block is fixedly provided on the edge of the bottom surface of the limit gear chamber, a cantilever is fixedly provided on the inner wall of the limit gear chamber, and the suspended end of the cantilever is engaged with the limit gear.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] The injection dose limiting assembly of the present invention is provided with a limit gear between the force storage spring assembly and the dose knob. When the dose knob is rotated to reach the maximum dose setting number of circles, the limit gear limits the rotation of the dose knob, thereby preventing the dose set at the last injection from exceeding the remaining dose of the drug solution, thereby preventing the inaccurate amount of injected drug from causing harm to the patient's health.

[0023] The dose limiting assembly for injection described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the structure of the dose limiting assembly for injection disclosed in the present invention;

[0026] Figure 2 It is a structural schematic diagram of the fixed gear disclosed in the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the dosage knob and the limit gear disclosed in the present invention;

[0028] Figure 4 It is a structural schematic diagram of the initial positions of the limiting gear and the fixed gear disclosed in the present invention;

[0029] Figure 5 It is a cross-sectional view of the end positions of the limiting gear and the fixed gear disclosed in the present invention;

[0030] Figure 6 This is a working principle diagram of the limiting gear and the fixed gear disclosed in the present invention;

[0031] Figure 7 It is a schematic diagram of the structure in which the limiting gear disclosed in the present invention is arranged on a fixing member;

[0032] Figure 8 It is a schematic diagram of the structure of the limit gear and the stop gear disclosed in the present invention;

[0033] Fig. 9 It is a structural schematic diagram of the fixing member disclosed in the present invention;

[0034] Fig.10 It is a schematic diagram of the structure of the dosage knob disclosed in the present invention;

[0035] Fig.11 It is a structural schematic diagram of the initial positions of the limit gear and the stop gear disclosed in the present invention;

[0036] Fig.12 It is a structural schematic diagram of the terminal positions of the limit gear and the stop gear disclosed in the present invention;

[0037] Fig.13 It is a schematic structural diagram of a cross-section of the fixing member disclosed in the present invention;

[0038] Fig.14 It is a schematic diagram of the structure in which the limit gear disclosed in the present invention is arranged on the gear seat;

[0039] Fig.15 It is a schematic structural diagram of the gear seat and the limiting gear disclosed in the present invention.

[0040] in:

[0041] 1. Dosage knob, 1-1. Pulling tooth, 2. Limiting gear, 2-1. Baffle, 2-3. Limiting tooth, 3. Energy storage spring assembly, 4. Fixed gear, 5. Gear shaft, 7. 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. Block, 10-2. Limiting gear chamber, 10-3. Cantilever, 11. Pen body. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0043] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0044] like Figure 1-Figure 13As shown, the present invention provides a dose limiting assembly for injection, comprising a dose knob 1, which is rotatably arranged on a force storage spring assembly 3, a fixed gear 4 is fixedly arranged on the upper part of the force storage spring assembly 3, a limit gear 2 is rotatably arranged inside the dose knob 1, and the limit gear 2 is meshed with the fixed gear 4. When setting a dose, the dose knob 1 rotates to drive the limit gear 2 to rotate. When injecting, the positions of the limit gear 2, the fixed gear 4 and the dose knob 1 remain unchanged. When the cumulative dose set by the dose knob 1 reaches a predetermined maximum dose, the limit gear 2 limits the rotation of the dose knob 1.

[0045] Furthermore, the number of teeth of the limiting gear 2 is smaller than the number of teeth of the fixed gear 4;

[0046] A baffle 2 - 1 is fixedly arranged on the lower end surface of the limiting gear 2 , and a stopper 7 is fixedly arranged on the lower end surface of the fixed gear 4 .

[0047] Furthermore, the stopper 7 includes a starting portion 7-1 and an ending portion 7-2. The dose set by the dose knob 1 is from zero dose to the entire process of liquid medicine injection, and the baffle 2-1 rotates from the starting portion 7-1 to the ending portion 7-2.

[0048] Furthermore, when the dose knob 1 is used to set the dose, the limit gear 2 rotates around its own center line X2 and revolves around the center line X1 of the syringe, and the center line X2 of the limit gear 2 is parallel to the center line X1 of the dose knob 1 .

[0049] In addition, the present invention provides a dose limiting assembly for injection, wherein the dose knob 1 is rotatably arranged on the force storage spring assembly 3, the fixing piece 8 is fixedly arranged on the force storage spring assembly 3, the limit gear 2 is rotatably arranged in the fixing piece 8, the limit gear 2 is meshed with the stop gear 9, the stop gear 9 is coaxially arranged with the dose knob 1, when the dose is set, the dose knob 1 rotates to drive the limit gear 2 to rotate, when injecting, the positions of the limit gear 2, the stop gear 9 and the dose knob 1 remain unchanged, when the cumulative dose set by the dose knob 1 reaches a predetermined maximum dose, the limit gear 2 limits the rotation of the dose knob 1.

[0050] Furthermore, a pull-out tooth 1 - 1 is fixedly arranged on the inner wall of the dosage knob 1 , and the pull-out tooth 1 - 1 is meshed with the limit gear 2 ;

[0051] A limiting portion 9 - 1 is fixedly disposed on the outer wall of the stop gear 9 . When the dose knob 1 reaches the full dose of the drug solution to be injected, the limiting portion 9 - 1 engages with the limiting gear 2 to limit the dose knob 1 from setting the dose.

[0052] Furthermore, a damping protrusion 8 - 1 is fixedly provided on the member 8 , and the damping protrusion 8 - 1 is in contact with the tooth top of the limiting gear 2 .

[0053] In addition, the present invention provides a dose limiting assembly for injection, wherein the dose knob 1 is rotatably arranged on the force storage spring assembly 3, the gear seat 10 is fixedly arranged on the force storage spring assembly 3, the limit gear 2 is rotatably arranged in the gear seat 10, and the rotation axis of the limit gear 2 does not coincide with the rotation axis of the dose knob 1;

[0054] A pull-out tooth 1-1 is fixedly arranged on the inner wall of the dosage knob 1, and the pull-out tooth 1-1 is meshed with the limit gear 2;

[0055] A stopper 10 - 1 is fixedly arranged on the gear seat 10 , and a limiting tooth 2 - 3 is arranged on the limiting gear 2 .

[0056] Furthermore, during the entire process from zero dose to complete injection of the drug solution, the limit 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 so that the limit tooth 2-3 cannot continue to rotate.

[0057] Furthermore, a limit gear chamber 10-2 is set on the gear seat 10, the limit gear 2 is rotatably set in the limit gear chamber 10-2, the blocking block 10-1 is fixedly set on the edge of the bottom surface of the limit gear chamber 10-2, and the cantilever 10-3 is fixedly set on the inner wall of the limit gear chamber 10-2, and the suspended end of the cantilever 10-3 is clamped with the limit gear 2.

[0058] The working principle of the above technical solution is:

[0059] In order to prevent the set dose from exceeding the dose of the remaining medicine during the last injection, a limit gear 2 is provided in the dose knob 1. When setting the dose, the dose knob 1 rotates to drive the limit gear 2 to rotate. During injection, the positions of the limit gear 2 and the dose knob 1 remain unchanged. When the cumulative dose set by the dose knob 1 reaches the predetermined maximum dose, the limit gear 2 limits the rotation of the dose knob 1.

[0060] The limit gear 2 is rotatably arranged in the dose knob 1, and can be arranged on a connecting plate which is perpendicular to the central axis of the dose knob 1 and fixedly connected to the inner wall of the dose knob 1. A gear shaft 5 is fixedly arranged on the connecting plate. The limit gear 2 is rotatably arranged on the gear shaft 5. The dose knob 1 is rotatably arranged on the upper part of the force storage spring assembly 3. The limit gear 2 is meshed with a fixed gear 4 fixedly arranged on the top of the force storage spring assembly 3. The number of teeth of the limit 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 block 7. When the dose setting starts, as shown in FIG. Figure 4-Figure 5As shown, the dose knob 1 is rotated clockwise, the limit gear 1 rotates with the dose knob 1, the limit 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 limit gear 2 is less than the number of teeth of the fixed gear 4, when the dose knob 1 rotates one circle, the limit gear 2 rotates more than one circle. The extra rotation angle prevents the baffle 2-1 from being blocked by the starting part 7-1 and rotates a certain angle more relative to the initial position. After the dose knob 1 rotates multiple circles for multiple dose settings, the baffle 2-1 just rotates to the final position. The stop portion 7-2 is blocked. Since the limit gear 2 and the fixed gear 4 are meshed with each other and the distance between the axes of the two cannot change, after the baffle 2-1 is blocked by the stop portion 7-2, the limit gear 2 and the fixed gear 4 can no longer continue to rotate. The limit gear 2 also prevents the dose knob 1 from continuing to rotate through the gear shaft 5. Therefore, when the set dose reaches the expected maximum dose (that is, the maximum injection dose of the injection pen), the dose knob 1 is prevented from continuing to set the dose, thereby preventing the dose setting from exceeding the maximum injection dose of the injection pen.

[0061] The limiting gear 2 and the fixed gear 4 mesh and limit the principle, such as Figure 6 As shown, according to the gear meshing principle, the lengths of rotation of the limit gear 2 and the fixed gear 4 along the pitch circle when they rotate are equal. Since the number of teeth of the limit gear 2 is designed to be smaller than that of the fixed gear 4, the pitch circle of the limit gear 2 is smaller than that of the fixed gear 4, that is, when the limit gear 2 revolves around the fixed gear 4 once, the length of the pitch circle it passes is the length of the pitch circle of the fixed gear 4. The limit gear 2 needs to pass through a pitch circle length greater than its own rotation, and the extra length is the distance that the baffle 2-1 advances relative to its previous position when the limit gear 2 revolves once, and so on. When the baffle 2-1 rotates to the end portion 7-2, the outer limit gear is blocked and stops moving.

[0062] After each dose setting, when an injection is performed, the positions of the dose knob 1 and the force storage spring assembly 3 remain stationary, the force storage spring assembly 3 is detachably connected to the pen body 11, and the position between the installed force storage spring assembly 3 and the pen body is fixed.

[0063] The limit gear 2 can also be set in the fixing part 8, the fixing part 8 is fixedly set on the top of the force storage spring assembly 3, the stop gear 9 is rotatably set in the fixing part 8, the stop gear 9 is meshed with the limit gear 2, the stop gear 9 is coaxially set with the dose knob 1, the stop gear 9 can use the inner cavity of the fixing part 8 for limiting, and can also be rotatably set on the shaft of the transmission unit, the inner wall of the dose knob 1 is fixedly set with a pulling tooth 1-1, when the dose knob 1 is set, every time it rotates one circle, the pulling tooth 1-1 drives the limit gear 2 to rotate one tooth angle, when it is in the initial position, such as Fig.10As shown, one side of the limiting portion 9-1 contacts the limiting gear 2. Since the limiting portion cannot mesh with the limiting gear 2, the limiting gear 2 cannot rotate counterclockwise. When setting the dose, the dose knob 1 rotates clockwise, and each rotation drives the limiting gear 2 to rotate by one tooth angle. After the dose knob 1 rotates multiple times, the limiting portion 9-1 gradually moves away from the limiting gear 2 and approaches the limiting gear from the other side. Fig.11 As shown, when the limiting portion 9 - 1 contacts the limiting gear 2 , the limiting portion 9 - 1 prevents the limiting gear 2 and the stop gear 9 from continuing to mesh, and the two cannot continue to rotate, thereby preventing the dose knob 1 from continuing to rotate to set the dose.

[0064] A damping protrusion 8-1 is arranged in the fixing member 8, and the damping protrusion 8-1 contacts the tooth top of the limit gear 2. After the pulling tooth 1-1 of the dose knob 1 drives the limit gear 2 to rotate an angle, the damping protrusion 8-1 plays a damping role on the limit gear 2 to prevent the limit gear 2 from continuing to rotate due to inertia or external reasons, causing position deviation.

[0065] The limit gear 2 can also be rotatably set in the gear seat 10, the gear seat 10 is fixedly set on the top of the force storage spring assembly 3, the limit gear 2 is provided with a limit tooth 2-3, the gear seat 10 is provided with a limit gear chamber 10-2, and the edge of the bottom surface of the limit gear chamber 10-2 is fixedly provided with a blocking block 10-1. In the initial position, the limit tooth 2-3 contacts with a side wall of the blocking block 10-1. When setting the dose, the dose knob 1 is rotated. Every time the dose knob 1 rotates one circle, the limit gear 2 is driven to rotate by an angle of one tooth. After multiple dose settings, after the dose knob 1 rotates multiple circles, the limit tooth 2-3 contacts with the other side wall of the blocking block 10-1 and is blocked. The limit gear 2 can no longer rotate and the dose knob 1 can no longer rotate, thereby limiting the dose knob from continuing to set the dose.

[0066] A cantilever 10-3 is arranged in the limit gear chamber 10-2, and the suspended end of the cantilever 10-3 is engaged with the limit gear 2 to prevent the limit 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 dose, the limit gear 2 can lift the cantilever 10-3 to rotate. After the limit gear 2 rotates by one tooth angle, the cantilever 10-3 clamps the limit gear again.

[0067] Beneficial effects of the above technical solution:

[0068] The injection dose limiting assembly of the present invention is provided with a limit gear between the force storage spring assembly and the dose knob. When the dose knob is rotated to reach the maximum dose setting number of circles, the limit gear limits the rotation of the dose knob, thereby preventing the dose set at the last injection from exceeding the remaining dose of the drug solution, thereby preventing the inaccurate amount of injected drug from causing harm to the patient's health.

[0069] In one embodiment, a sensor module is provided on the dose knob 1, and the sensor module includes a position sensor and a wireless transmitting unit. The sensor is used to detect the number of rotations of the dose knob 1. A plurality of magnetic units arranged in an array are provided 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 at a position opposite to the magnetic unit on the dose knob 1. When the dose knob 1 rotates, the magnetic sensor scans each magnetic unit. At the initial position, the magnetic sensor on the dose knob 1 corresponds to the magnetic unit at position 0, and the other magnetic units are evenly distributed corresponding to different angles. The number of magnetic units can be set as needed. When setting the dose, the dose knob 1 rotates, and each time it passes through the magnetic unit at position 0, the dose knob 1 rotates one circle. When the dose setting is completed and the dose knob 1 stops, the angle corresponding to the magnetic unit corresponding to the magnetic sensor is the angle when the dose knob 1 rotates less than one circle, and the processor converts the angle into a decimal value of the number of circles. When setting the dose next time, 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 turns, and the processor records the dose value set each time according to the dose value corresponding to each turn of the dose knob.

[0070] The wireless transmitting unit transmits the data of the number of rotations of the dose knob 1 detected by the sensor to the terminal, on which a processor and an alarm unit are arranged. The processor converts the number of rotations data into dose data and stores it in the storage unit according to the dose corresponding to each rotation of the preset dose knob. The processor also presets a dose prediction model, which generates a predicted dose according to the historical data stored in the storage unit. When setting the dose before the next injection, the processor calculates the set dose according to the number of rotations of the dose knob 1 transmitted in real time, and compares the difference between the set dose and the predicted dose. If the difference between the set dose and the predicted dose is within a threshold range, a normal injection is prompted. If the difference between the set dose and the predicted dose exceeds the threshold range, the processor controls the alarm unit to sound an alarm, prompting the patient to check whether the set dose is accurate.

[0071] The expression of the dose prediction model is:

[0072]

[0073] S is the predicted dose, n is the number of historical data, i is the value range of historical data, f i is the weight of the i-th data, S i is the dosage data of the i-th historical data.

[0074] The total dose of the injection pen is preset in the processor. The set dose is recorded and summarized after each injection, and the summarized dose is summed with 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 summed with the dose set at the last injection and compared with the preset total dose of the injection pen. If the total dose of the injection pen is exceeded, an alarm is triggered to prompt the patient to check the dose setting value at the last injection.

[0075] The working principle of the above technical solution is:

[0076] A sensor module is provided on the dose knob 1, and the sensor module includes a position sensor and a wireless transmitting unit. The sensor is used to detect the number of revolutions of the dose knob 1. A plurality of magnetic units arranged in an array are provided on the upper part of the outer circumferential surface of the force storage spring assembly 3 along the circumferential direction. A magnetic sensor is provided at a position on the dose knob 1 opposite to the magnetic unit. In the initial position, the magnetic sensor on the dose knob 1 corresponds to the magnetic unit at the 0 position, and the other magnetic units are evenly distributed, corresponding to different angles. The number of magnetic units can be set as needed. When setting the dose, the dose knob 1 rotates, and each time it passes through the magnetic unit at the 0 position, the magnetic sensor records one revolution. When the dose setting is completed and the dose knob 1 stops, the angle corresponding to the magnetic unit corresponding to the magnetic sensor is the angle when the dose knob 1 rotates less than one revolution, and the processor converts the angle into a decimal value of the number of revolutions. When the dose is set for the next time, the angle of the magnetic unit rotated to the 0 position by the magnetic sensor is converted into a decimal value of the number of revolutions, and the processor records the dose value set each time according to the dose value corresponding to each revolution of the dose knob.

[0077] The dosage of the medicine injected by the patient will change according to the changes in the physical condition during the use of the medicine, such as increase or decrease. When injecting, the patient sometimes forgets to adjust the dosage, and sometimes the patient sets the dosage incorrectly before the injection. If the wrong dosage is injected, it will have a greater impact on the patient's health. The injection pen of the cartridge bottle can be replaced. If the number of injections is large, the dosage setting data for multiple injections can be collected. The collected data is stored in the storage unit. The processor assigns weights to each historical data. The earlier the data, the lower the weight, and the later the data, the higher the weight. The predicted dose is calculated based on the historical data and the weight. When setting the dose, the processor compares the difference between the set dose and the predicted dose.

[0078] The expression of the dose prediction model is:

[0079]

[0080] S is the predicted dose, n is the number of historical data, i is the value range of historical data, f i is the weight of the i-th data, S i is the dosage data of the i-th historical data.

[0081] The threshold range is ±0.02ml.

[0082] The terminal can be set on the pen body, and the terminal can also be a mobile phone used by the patient.

[0083] The total dose of the injection pen is preset in the processor. The set dose is recorded and summarized after each injection, and the summarized dose is summed with 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 summed with the dose set at the last injection and compared with the preset total dose of the injection pen. If the total dose of the injection pen is exceeded, an alarm is triggered to prompt the patient to check the dose setting value at the last injection.

[0084] After recording and calculating the total set dose for the last injection, the summary value is reset to zero, and the processor restarts recording the total set dose after the patient changes the vial.

[0085] Beneficial effects of the above technical solution:

[0086] It can prevent the limiting component from being damaged due to excessive force applied by the patient during the last injection, and cannot limit the dose set by the dose knob from exceeding the remaining liquid medicine. Each set dose is accumulated and recorded to prevent the set dose from exceeding the remaining liquid medicine during the last injection.

[0087] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0088] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A dose limiting component for injection, characterized in that: The invention comprises a dose knob (1), wherein the dose knob (1) is rotatably arranged on a force storage spring assembly (3), a fixed gear (4) is fixedly arranged on the upper part of the force storage spring assembly (3), a limit gear (2) is rotatably arranged inside the dose knob (1), the limit gear (2) is meshed with the fixed gear (4), when setting a dose, the dose knob (1) rotates to drive the limit gear (2) to rotate, when injecting, the positions of the limit gear (2), the fixed gear (4) and the dose knob (1) remain unchanged, and when the cumulative dose set by the dose knob (1) reaches a predetermined maximum dose, the limit gear (2) limits the rotation of the dose knob (1).

2. The dose limiting assembly for injection according to claim 1, characterized in that: The number of teeth of the limiting gear (2) is smaller than the number of teeth of the fixed gear (3); A baffle (2-1) is fixedly arranged on the lower end surface of the limiting gear (2), and a stopper (7) is fixedly arranged on the lower end surface of the fixed gear (3).

3. The dose limiting assembly for injection according to claim 2, characterized in that: The baffle (7) comprises a starting portion (7-1) and an ending portion (7-2). The dose set by the dose knob (1) ranges from zero dose to the entire process of liquid medicine injection, and the baffle (2-1) rotates from the starting portion (7-1) to the ending portion (7-2).

4. The dose limiting assembly for injection according to claim 3, characterized in that: When the dosage knob (1) is used to set the dosage, the limit gear (2) rotates around its own center line X2 and revolves around the center line X1 of the syringe, and the center line X2 of the limit gear (2) is parallel to the center line X1 of the dosage knob (1).

5. A dose limiting component for injection, characterized in that: The dose knob (1) is rotatably arranged on the force storage spring assembly (3), a fixing member (8) is fixedly arranged on the force storage spring assembly (3), a limit gear (2) is rotatably arranged in the fixing member (8), the limit gear (2) is meshed with a stop gear (9), the stop gear (9) and the dose knob (1) are coaxially arranged, when setting a dose, the dose knob (1) rotates to drive the limit gear (2) to rotate, when injecting, the positions of the limit gear (2), the stop gear (9) and the dose knob (1) remain unchanged, when the cumulative dose set by the dose knob (1) reaches a predetermined maximum dose, the limit gear (2) limits the rotation of the dose knob (1).

6. The dose limiting assembly for injection according to claim 5, characterized in that: A pulling tooth (1-1) is fixedly arranged on the inner wall of the dosage knob (1), and the pulling tooth (1-1) is meshed with the limit gear (2); A limiting portion (9-1) is fixedly arranged on the outer wall of the stop gear (9); when the dose knob (1) reaches the full dose of the drug solution injection, the limiting portion (9-1) engages with the limiting gear (2) to limit the dose knob (1) from setting the dose.

7. The dose limiting assembly for injection according to claim 6, characterized in that: A damping protrusion (8-1) is fixedly arranged on the fixing member (8), and the damping protrusion (8-1) is in contact with the tooth top of the limiting gear (2).

8. A dose limiting component for injection, characterized in that: The dosage knob (1) is rotatably mounted on the force storage spring assembly (3), a gear seat (10) is fixedly mounted on the force storage spring assembly (3), a limit gear (2) is rotatably mounted in the gear seat (10), and a rotation axis of the limit gear (2) does not coincide with a rotation axis of the dosage knob (1); A pulling tooth (1-1) is fixedly arranged on the inner wall of the dosage knob (1), and the pulling tooth (1-1) is meshed with the limit gear (2); A blocking block (10-1) is fixedly arranged on the gear seat (10), and a limiting tooth (2-3) is arranged on the limiting gear (2).

9. The dose limiting assembly for injection according to claim 8, characterized in that: During the entire process from zero dose to complete injection of the drug solution, the limit 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), so that the limit tooth (2-3) cannot continue to rotate.

10. The dose limiting assembly for injection according to claim 9, characterized in that: A limit gear chamber (10-2) is arranged on the gear seat (10), the limit gear (2) is rotatably arranged in the limit gear chamber (10-2), the blocking block (10-1) is fixedly arranged on the edge of the bottom surface of the limit gear chamber (10-2), a cantilever (10-3) is fixedly arranged on the inner wall of the limit gear chamber (10-2), and the suspended end of the cantilever (10-3) is clamped with the limit gear (2).

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