Pen type injector capable of accurately displaying residual dose

Abstract

The utility model discloses a pen type syringe capable of accurately displaying residual dose, which comprises a shell, a dose adjusting part arranged on the shell, an upper rotating part arranged in the dose adjusting part, and a small dose part arranged between the dose adjusting part and the upper rotating part, when the dose is set, the small dose part moves upwards along the axial direction of the dose adjusting part, and when injection is carried out, the small dose part moves upwards along the axial direction of the dose adjusting part. The small dosage piece and the dosage adjusting piece are kept still, and when the dosage is set, the moving distance of the small dosage piece is matched with the set dosage. According to the pen type injector capable of accurately displaying the residual dose, the small dose piece is arranged between the dose adjusting piece and the upper rotating piece, when the accumulative set dose reaches the maximum dose of the injection pen, the small dose piece prevents the dose adjusting piece from intermittently setting the dose, the situation that the set dose exceeds the maximum dose, and consequently the injection dose is insufficient is avoided, and the injection quality is improved. The medication safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection pen technology, and more specifically, to a pen injector with accurate display of remaining dosage. Background Technology

[0002] An injection pen is a device that combines medication and injection mechanism for convenient patient use, such as for injecting insulin. An injection pen includes a dose adjustment mechanism, an injection mechanism, and a drug reservoir.

[0003] Patent document CN220276057U discloses a drug injection pen, which includes a housing having an opening or window therein, and a dose setting knob at least partially disposed within the housing. The dose setting knob is movable relative to the housing to set a desired drug dose, and displays one or more dose value indicators thereon. The opening or window in the housing and the dose value indicators on the dose setting knob are configured such that when the dose setting knob is moved relative to the housing to set or select a desired dose, the dose value indicating the selected dose is identifiable when viewed through the opening or window, but not otherwise clearly identifiable.

[0004] The medication dosage in the cartridges of existing injection pens is mostly for multiple uses. However, the dosage setting knob can be set to the maximum dosage after each injection. Before the last injection, the remaining dosage in the cartridge may be less than the set dosage, which will lead to insufficient drug injection, affect the treatment effect, and even endanger the patient's life.

[0005] Therefore, it is necessary to propose a pen injector with accurate remaining dose display to address the problems existing in the prior art. Utility Model Content

[0006] The utility model description section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description 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 solve the above problems, this utility model provides a pen-type injector with accurate display of remaining dose, including a shell, a dose adjustment component on the shell, an upper rotating component inside the dose adjustment component, and a small dose component between the dose adjustment component and the upper rotating component. When the dose is set, the small dose component moves upward along the axial direction of the dose adjustment component. When injection is performed, the small dose component and the dose adjustment component remain stationary.

[0008] When setting the dosage, the distance the dosage unit moves is matched with the dosage set by the dosage adjuster.

[0009] Preferably, the dosage component is slidably disposed in the guide groove on the inner wall of the dosage adjustment component, and the dosage component is connected to the thread on the outer circumference of the upper rotating component. The upper end of the thread is provided with a termination part, and the lower end of the thread is provided with a starting part.

[0010] Preferably, the dosage component includes an arc-shaped plate and a protrusion fixedly disposed on the inner side of the arc-shaped plate. The arc-shaped plate is slidably disposed in the guide groove, and the protrusion is connected to the threaded connection on the outer circumference of the upper rotating component.

[0011] Preferably, the termination part is an inclined surface, the angle between the termination part and the axial surface of the upper rotating part is α, and a groove is formed on the side of the protrusion of the dosage small part opposite to the inclined surface, the shape of the groove being adapted to the shape of the inclined surface.

[0012] Preferably, the included angle α is 0°<α≤15°.

[0013] Preferably, the protrusion of the small dosage part is integrally formed with the arc-shaped plate.

[0014] Preferably, the guide groove is arranged along the axial direction of the dose adjustment component.

[0015] Preferably, a viewing window fixing component is fixedly installed on the upper part of the outer casing, and the dosage adjustment component is threadedly connected to the viewing window fixing component.

[0016] Preferably, the upper rotating component is cylindrical, with a first annular tooth fixedly provided on its lower end face, and a second annular tooth fixedly provided at the lower part of the dose adjusting component at a position corresponding to the first annular tooth, with the first annular tooth and the second annular tooth engaging and connecting.

[0017] Preferably, the dosage unit is made of a polymer material.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The pen-type injector with accurate remaining dose display of this utility model has a small dose component between the dose adjustment component and the upper rotating component. When the cumulative set dose reaches the maximum dose of the injection pen, the small dose component prevents the dose adjustment component from intermittently setting the dose, preventing the set dose from exceeding the maximum dose and causing insufficient injection dose, thereby improving medication safety.

[0020] The remaining dose accurately displayed pen injector of this invention, other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the disassembled structure of the pen injector for precise display of remaining dose disclosed in this utility model.

[0023] Figure 2 This is a cross-sectional structural schematic diagram of the residual dose metering component disclosed in this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the dose adjustment component, the upper rotating component, and the dose adjustment component disclosed in this utility model;

[0025] Figure 4 This is a cross-sectional structural schematic diagram of the dose adjustment component disclosed in this utility model;

[0026] Figure 5 This is a schematic diagram of the axial cross-section of the upper rotating component disclosed in this utility model;

[0027] Figure 6 This is a schematic diagram of the radial cross-section of the upper rotating member disclosed in this utility model.

[0028] Figure 7 This is a cross-sectional structural schematic diagram of the dosage component disclosed in this utility model. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] like Figures 1-7 As shown, a pen-type injector with precise remaining dose display includes a housing 1, a dose adjustment component 2 disposed on the housing 1, an upper rotating component 3 disposed inside the dose adjustment component 2, and a dose component 4 disposed between the dose adjustment component 2 and the upper rotating component 3. When the dose is set, the dose component 4 moves upward along the axial direction of the dose adjustment component 2. When injecting, the dose component 4 and the dose adjustment component 2 remain stationary. When the dose is set, the distance that the dose component 4 moves matches the set dose.

[0032] When setting the dosage, the distance that the dosage component 4 moves matches the dosage set by the dosage adjustment component 2.

[0033] Furthermore, the dosage component 4 is slidably disposed in the guide groove 6 on the inner wall of the dosage adjustment component 2. The dosage component 4 is connected to the thread on the outer circumference of the upper rotating component 3. The upper end of the thread is provided with a termination part 9, and the lower end of the thread is provided with a starting part 8.

[0034] Furthermore, the dosage component 4 includes an arc-shaped plate 5 and a protrusion 7 fixedly disposed on the inner side of the arc-shaped plate 5. The arc-shaped plate 5 is slidably disposed in the guide groove 6, and the protrusion 7 is threadedly connected to the outer circumference of the upper rotating component 3.

[0035] Furthermore, the termination part 9 is an inclined surface, and the angle between the termination part 9 and the axial surface of the upper rotating part 3 is α. A slot 20 is opened on the side of the protrusion 7 of the dosage small part 4 opposite to the inclined surface, and the shape of the slot 20 is adapted to the shape of the inclined surface.

[0036] Furthermore, the included angle α is 0°<α≤15°.

[0037] Furthermore, the protrusion 7 of the dosage component 4 is integrally formed with the arc-shaped plate 5.

[0038] Furthermore, the guide groove 6 is arranged along the axial direction of the dose adjustment component 2.

[0039] Furthermore, a viewing window fixture 10 is fixedly installed on the upper part of the outer casing 1, and the dosage adjustment component 2 is threadedly connected to the viewing window fixture 10.

[0040] Furthermore, the upper rotating member 3 is cylindrical, with a first annular tooth 11 fixedly provided on its lower end face, and a second annular tooth 12 fixedly provided at the lower part of the dose adjusting member 2 at a position corresponding to the first annular tooth 11, with the first annular tooth 11 and the second annular tooth 12 engaging and connecting.

[0041] Furthermore, the dosage component 4 is made of a polymer material.

[0042] The working principle of the above technical solution:

[0043] The dose adjustment component 2 is used to set the dosage for each injection. The dose adjustment component 2 moves spirally relative to the outer casing 1. When setting the dosage, the dose adjustment component 2 rotates relative to the outer casing and moves axially upwards. The upper rotating component 3 moves axially relative to the outer casing 1. Due to the relative rotation between the dose adjustment component 2 and the upper rotating component 3, the protrusion 7 of the small dose piece 4 in the guide groove 6 of the sliding dose adjustment component 2 moves upwards due to the action of the thread on the outer circumference of the upper rotating component 3. To accurately match the movement distance of the small dose piece 4 with the dosage of the medication in the vial, the length of the medication stored in the vial and the pitch of the screw thread during rotation between the dose adjustment component 2 and the outer casing 1 are considered. The pitch and length of the thread on the outer circumference of the upper rotating part 3 are set, and a starting part 8 and a terminating part 9 are respectively set at the upper and lower ends of the thread. The distance between the starting part 8 and the terminating part 9 matches the total dose that the dose adjustment part 2 can adjust. When the injection pen is first installed, the protrusion 7 of the dosage piece 4 is pressed against the starting part 8. According to the set pitch of the thread on the outer circumference of the upper rotating part 3 and the distance between the starting part 8 and the terminating part 9, when the dosage piece moves to the terminating part, it can just inject the entire dose of medicine in the cartridge. For injection safety, the dose of medicine in the cartridge can be slightly greater than the total dose set by the injection pen to ensure the safety of the last injection.

[0044] After multiple injections, the amount of medication in the vial may be less than the patient's expected dose. The following is a brief explanation using a 60ml vial as an example. When setting the dose, the dose adjuster 2 rotates the dose dispenser 4. Due to the thread on the outer circumference of the upper rotating part 3, the dose dispenser 4 moves upward a certain distance along the axis within the guide groove 6. During injection, the dose adjuster 2 rotates synchronously with the upper rotating part 3, while the dose dispenser 4 remains stationary within the dose adjuster 2. After the previous injections, the remaining medication in the vial is 10ml. The small part 4 also moves to the corresponding position in the guide groove 6. The patient wants to inject 15ml this time. When setting the dosage, when the dosage adjustment part 2 is rotated to 10ml, the protrusion 7 of the dosage small part 4 contacts the termination part 9, and the dosage adjustment part 2 cannot be rotated, reminding the patient that there is only 10ml of medicine left in the injection pen. The patient can choose to inject 10ml of medicine and then use a new injection pen to inject the missing dosage, or not use this injection pen anymore. The patient can choose according to their own needs, which can prevent the patient from experiencing physical discomfort or harm due to insufficient injection dosage.

[0045] The protrusion 7 of the dosage piece 4 is fixedly set on the inner side of the arc plate 5, and the inner side of the arc plate 5 refers to the side of the arc plate facing the bending center.

[0046] The dosing component 4 is made of a polymer material, such as polycarbonate, polyphenylene ester, or polytetrafluoroethylene. In particular, polytetrafluoroethylene has a very low coefficient of friction, which can reduce the friction between the dosing component 4 and the dosing adjustment component 2 and the upper rotating component 3, thereby improving the accuracy of the movement of the dosing component 4.

[0047] Due to cost and installation considerations, most components of the injection pen are made of plastic. Plastic is inexpensive to manufacture and easy to install. The dose adjustment component 2 and the upper rotating component 3 are also mostly made of plastic. Plastic is susceptible to deformation under external force. Furthermore, due to manufacturing precision limitations, there will be a gap between the dose adjustment component 2 and the upper rotating component 3. When the protrusion 7 of the small dose piece 4 contacts the termination part 9, if the patient applies significant force, the protrusion 7 of the small dose piece 4 may extend beyond the termination part 9, causing the small dose piece 4 to malfunction. Therefore, it is possible to... The termination part 9 is set as an inclined surface with one end away from the axis of the upper rotating part 3 inclined towards the thread side. The included angle α between the inclined surface and the axial surface of the upper rotating part 3 is greater than 0 degrees and less than or equal to 15 degrees. A slot 20 is opened at the position corresponding to the protrusion 7 of the dosage piece 4. When the slot 20 contacts the inclined surface, the pressure of the inclined surface on the slot 20 includes the component force in the axial direction of the upper rotating part 3, so that the inclined surface presses the protrusion 7 tightly, so that the protrusion 7 cannot go beyond the termination part 9, ensuring that the cumulative dose setting does not exceed the dose of the liquid in the cartridge, and ensuring the safety of patient medication.

[0048] The axial surface refers to the plane that passes through the axis of the upper rotating part 3 and the intersection of the lowest point of the thread and the end part.

[0049] How does an injection pen work?

[0050] Pen-type injection assembly: First, take the outer shell 1, assemble the screw 14 from the top into the one-way rotating shaft 13, then screw the assembled screw 14 into the threads of the outer shell 1, assemble the window fixing piece 10 into the fixing hole in the outer shell 1, then screw the dose adjustment piece 2 into the window fixing piece 10, then press the upper rotating piece 3 into the dose adjustment piece 2 and sleeve it on the one-way rotating shaft 13. The upper rotating piece 3 and the one-way rotating shaft 13 can only move axially. Then insert the spring 18 and press the top button 19. At this time, the power and adjustment parts are assembled. First, assemble the rubber stopper into the spherical body at the bottom of the screw 14, assemble the cartridge bottle 15 filled with the medicine into the cartridge bottle outer shell 16, then assemble the assembled cartridge bottle outer shell 16 into the outer shell 1, and then cover it with the pen shell 17.

[0051] Dosage adjustment and calibration: First, manually rotate the dosage adjustment component 2 clockwise upwards. At this time, the dosage component 4 rotates upwards in the guide groove 6 of the dosage adjustment component 2 and rotates concentrically in the thread of the upper rotating component 3. The outer thread of the upper rotating component 3 corresponds to the injection dose. The dosage adjustment component 2 moves up and down in rotation, while the upper rotating component 3 moves up and down axially. A spring arm is fixed at the lower end of the one-way rotating shaft 13, so that the one-way rotating shaft 13 can only rotate counterclockwise when viewed from the top of the injection pen. During dosage adjustment, the one-way rotating shaft 13 cannot rotate until the dosage adjustment component 2 is adjusted to the display scale that needs to be injected. If the dosage is over-adjusted, the dosage adjustment component 2 can be adjusted back and forth to correct the dosage until the correct dosage is achieved.

[0052] Medication Injection: First, take out the pen syringe, remove the pen casing 17, screw on the needle, remove the needle protective cover, insert the needle into the patient's injection position, hold the pen casing 1, and then press the top button 19. The top post in the middle of the top button 19 contacts the positioning plane in the upper rotating part 3. At this time, the first annular tooth 11 at the lower end of the upper rotating part 3 engages with the second annular tooth 12 at the lower end of the dose adjustment part 2, and under the force of manual pressing, the external thread in the dose adjustment part 2 rotates downward in the thread in the window fixing part 10. When the dosage component 4 and the upper rotating component 3 remain stationary in the thread and in the guide groove 6 of the dosage adjustment component 2, the dosage adjustment component 2, the upper rotating component 3, and the dosage component 4 rotate downwards simultaneously. The upper rotating component 3 drives the one-way rotating shaft 13 to rotate counterclockwise. The one-way rotating shaft 13 drives the middle screw 14 to rotate together. At this time, the screw 14 rotates in the thread in the middle of the outer shell 1. The outside of the screw 1 is in a threaded state. Then, the spherical compression rubber stopper at the bottom of the screw is pushed forward, thereby injecting the drug into the patient's body.

[0053] Step 4: Remaining Medication Dosage Display: When the last dose is injected, the dosage piece 4, starting from its original bottom position in the guide groove 6 of the dosage adjustment piece 2, moves upward along the thread in the upper rotating piece 3. At this time, the dosage piece 4 rotates with the thread of the upper rotating piece 3 and moves to the upper end of the thread. Simultaneously, the dosage of the medication matches the distance traveled by the thread of the upper rotating piece 3. Therefore, when the last dose and the remaining dosage are all displayed on the dosage adjustment piece, the position of the dosage piece 4 limits the corresponding distance of the dosage adjustment piece. This allows for accurate display of the remaining dosage of the medication, enabling users to clearly understand the usage status of the medication.

[0054] Step 5: Post-injection processing. After injection, replace the needle cap, remove the needle, and place it in the designated position. These are the specific steps of this embodiment. Through these steps, a pen-type syringe with accurate remaining dosage display can be manufactured and used, thereby improving drug usage efficiency, avoiding waste, and enhancing treatment effectiveness and safety.

[0055] The beneficial effects of the above technical solution are as follows:

[0056] The pen-type injector with accurate remaining dose display of this utility model has a small dose component between the dose adjustment component and the upper rotating component. When the cumulative set dose reaches the maximum dose of the injection pen, the small dose component prevents the dose adjustment component from intermittently setting the dose, preventing the set dose from exceeding the maximum dose and causing insufficient injection dose, thereby improving medication safety.

[0057] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 utility model according to the specific circumstances.

[0059] Although the embodiments of this utility model 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 this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A pen-type injector with precise remaining dose display, characterized in that, It includes a housing (1), a dose adjustment component (2) is provided on the housing (1), an upper rotating component (3) is provided inside the dose adjustment component (2), and a small dose component (4) is provided between the dose adjustment component (2) and the upper rotating component (3). When the dose is set, the small dose component (4) moves upward along the axial direction of the dose adjustment component (2). When injected, the small dose component (4) and the dose adjustment component (2) remain stationary.

2. The pen injector with precise remaining dose display according to claim 1, characterized in that, The dosage component (4) is slidably disposed in the guide groove (6) on the inner wall of the dosage adjustment component (2). The dosage component (4) is connected to the thread on the outer circumference of the upper rotating component (3). The upper end of the thread is provided with a termination part (9) and the lower end of the thread is provided with a starting part (8).

3. The pen injector with precise remaining dose display according to claim 2, characterized in that, The dosage component (4) includes an arc plate (5) and a protrusion (7) fixedly disposed on the inner side of the arc plate (5). The arc plate (5) is slidably disposed in the guide groove (6). The protrusion (7) is connected to the threaded connection on the outer circumference of the upper rotating component (3).

4. The pen injector with precise remaining dose display according to claim 3, characterized in that, The termination part (9) is an inclined surface, and the angle between the termination part (9) and the axial surface of the upper rotating part (3) is α. The protrusion (7) of the dosage small part (4) has a slot (20) on the side opposite to the inclined surface. The shape of the slot (20) is adapted to the shape of the inclined surface.

5. The pen injector with precise remaining dose display according to claim 4, characterized in that, The included angle α is 0°<α≤15°.

6. The pen injector with precise remaining dose display according to claim 5, characterized in that, The protrusion (7) of the dosage piece (4) is integrally formed with the arc plate (5).

7. The pen injector with precise remaining dose display according to claim 6, characterized in that, The guide groove (6) is set along the axial direction of the dose adjustment component (2).

8. The pen injector with precise remaining dose display according to claim 1, characterized in that, A viewing window fixture (10) is fixedly installed on the upper part of the outer casing (1), and the dose adjustment component (2) is threadedly connected to the viewing window fixture (10).

9. The pen injector with precise remaining dose display according to claim 8, characterized in that, The upper rotating part (3) is cylindrical, and a first ring tooth (11) is fixedly provided on the lower end surface. A second ring tooth (12) is fixedly provided at the lower part of the dose adjustment part (2) at a position corresponding to the first ring tooth (11). The first ring tooth (11) and the second ring tooth (12) are connected in cooperation.

10. The pen injector with precise remaining dose display according to claim 1, characterized in that, The dosage unit (4) is made of polymer materials.

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