Needleless injector body and needleless injector

Abstract

The utility model provides a needleless injector main body and a needleless injector. The needleless injector body includes: a base; the lens is arranged on the side surface of the base; an upper cover mounted on a side surface of the base and provided with a lens receiving hole to receive and expose the lens; wherein the lens comprises a main body and an installation base which is arranged below the main body and extends outwards in the radial direction to exceed the main body, the upper cover comprises a fixing edge which protrudes downwards from the lens containing hole, and when the upper cover is installed on the base, the fixing edge abuts against the installation base.

Description

Technical Field

[0001] This utility model relates to a medical device for injecting a substance. More specifically, this utility model relates to a needle-free injector body and a needle-free injector. Background Technology

[0002] A needle-free injector eliminates the need for a needle. Instead, it's a medical device that injects the drug into the patient's body by applying high pressure through a micro-orifice at the tip, thus sparing the patient the pain of needle pricks. A needle-free injector may include an injection head and a body. The injection head and a reservoir, such as a cartridge, are housed within the body, where the injection head draws the drug from the reservoir. After drawing, an actuator actuates the injection head to deliver the injection.

[0003] During medication intake and injection, it may be necessary to know the dosage of the medication drawn in each injection; or the medication in the reservoir may not be used up in one go and needs to be administered in multiple injections, in which case it may be necessary to know the number of injections already administered or the number of injections remaining. This information needs to be conveyed to the user through a display device (e.g., a window) on the needle-free injector. However, due to the small size of needle-free injectors, the display device is even smaller. Therefore, the information conveyed by the display device (e.g., numbers) usually needs to be magnified with the aid of a lens (e.g., a magnifying glass), which is very important for users, especially the elderly.

[0004] Existing magnifying glasses are irregularly shaped, including curved and flat segments, and practical experience has shown that improvements are needed. Furthermore, when assembling needle-free injectors, the magnifying glass is placed directly on the viewing window for installation, which cannot ensure accurate positioning and prevents displacement; in fact, the magnifying glass may even fall off during assembly.

[0005] Therefore, there is a need to provide a needle-free injector body and a needle-free injector to at least partially solve the above problems. Utility Model Content

[0006] According to one aspect of the present invention, a needleless injector body is provided, the needleless injector body comprising: a base; a lens disposed on the side of the base; and a top cover mounted to the side of the base and having a lens receiving hole for receiving the lens and exposing the lens; wherein the lens comprises a body and a mounting base disposed below the body and extending radially outward beyond the body, and the top cover includes a fixing edge protruding downward from the lens receiving hole, the fixing edge abutting against the mounting base when the top cover is mounted to the base.

[0007] In one embodiment, a positioning boss is also provided on the side of the base, and the positioning boss has a downwardly recessed positioning recess, in which the mounting base of the lens is positioned.

[0008] In one embodiment, the top cover further includes a protective ring that projects upward around the lens receiving hole, and when the top cover is mounted to the base, the protective ring is higher than the lens.

[0009] In one embodiment, the lens body is dome-shaped.

[0010] In one embodiment, the main body of the lens is part of a sphere.

[0011] In one embodiment, the mounting base is disc-shaped.

[0012] In one embodiment, the surface of the protective ring is configured as a curved surface.

[0013] In one embodiment, a through hole is provided in the positioning recess.

[0014] In one embodiment, the needleless injector body further includes an outer housing, which is installed inside the base at the front end of the base. The outer surface of the outer housing is provided with a scale, which is exposed through the through hole.

[0015] In one embodiment, the scale indicates the dosage.

[0016] In one implementation, the fixed edge is continuous.

[0017] In one embodiment, the fixed edge is discontinuous.

[0018] According to another aspect of the present invention, a needleless injector is provided, comprising a needleless injector body as described above and an injection head mounted on the front end of the needleless injector body.

[0019] This invention provides a magnifying glass assembly for a needle-free injector. The magnifying glass assembly provides a wider field of view and a clearer display effect, and can be accurately positioned and securely fixed, ensuring that it does not shift, is protected from impact, and remains clean and tidy during assembly, transportation, and use. Attached Figure Description

[0020] To better understand the above and other objects, features, advantages, and functions of this utility model, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate the preferred embodiments of this utility model and do not limit the scope of this utility model in any way; the parts in the drawings are not drawn to scale.

[0021] Figure 1 This is a perspective view of a needle-free injector according to one embodiment of the present invention.

[0022] Figure 2 This is a cross-sectional view of a needleless injector according to one embodiment of the present invention, taken along the longitudinal symmetry plane of the lens.

[0023] Figure 3 This is an exploded view of the top cover, lens, and base according to one embodiment of the present invention.

[0024] Figure 4 This is a perspective view of the top cover according to one embodiment of the present utility model.

[0025] Figure 5 This is a perspective view of a lens according to one embodiment of the present invention.

[0026] Figure 6 This is a perspective view of a base according to one embodiment of the present invention.

[0027] Figure 7 This is a perspective view of the outer casing according to one embodiment of the present invention. Detailed Implementation

[0028] Now, with reference to the accompanying drawings, specific embodiments of the present invention will be described in detail. The embodiments described herein are merely preferred embodiments of the present invention. Those skilled in the art can conceive of other ways to implement the present invention based on these preferred embodiments, and such other ways also fall within the scope of the present invention.

[0029] First, it should be noted that the "axial direction" or "longitudinal direction" mentioned in this article can be understood as the direction of the axis of the needle-free injector. In this axial direction, the direction towards the patient's medication site when using the needle-free injector is called the "front side," and the opposite direction is called the "back side." The direction the lens faces is called the upward direction or vertical direction, and the direction perpendicular to the vertical and longitudinal directions is called the transverse direction.

[0030] It should be noted that this article uses injectable pharmaceuticals, liquids, and other pharmaceutical substances as examples to describe the concept of this disclosure, but this is merely an example and is not restrictive. The injectable substance can be of various other types, such as saline solution, glucose, etc. As long as it can be injected into the human body by the needle-free injector of this disclosure, it falls within the protection scope of this disclosure.

[0031] refer to Figure 1 and Figure 2The needle-free injector 100 includes a needle-free injector body 20 and an injection head 10 mounted at the front end of the needle-free injector body 20. The injection head 10 includes a drug tube 11 and a piston rod 12 capable of pushing liquid medication forward within the drug tube 11. A cap is provided on the injection head 10 to close an injection micro-orifice located at the front end of the drug tube, connecting the chamber of the drug tube to the outside. The needle-free injector body 20 includes a base 21, an outer housing 22, and an internal push rod assembly 23. The base 21 has a forward opening, and the outer housing 22 has a rearward opening and is mounted at the front end of the base 21 to form a receiving space between the base 21 and the outer housing 22. The outer housing 22 has a front opening for securely mounting the injection head and its drug tube. The internal push rod assembly 23 is located within the receiving space and has a forward opening. A medication reservoir can be accommodated within the internal push rod assembly 23 and moves with the internal push rod assembly 23.

[0032] Throughout the drug aspiration and injection process, the outer shell 22 is fixed relative to the drug tube 11, and the internal push rod assembly 23 is fixed relative to the drug reservoir and piston rod 12. However, the outer shell 22, the internal push rod assembly 23, and the base 21 can all move relative to each other. Therefore, the outer shell 22 can drive the drug tube 11 to move, and the internal push rod assembly 23 can drive the drug reservoir and piston rod 12 to move.

[0033] The following is a brief description of the drug aspiration and injection process, which includes the following main steps in sequence: installation, pressurization and energy storage, drug aspiration, and injection. First, in the installation step, the piston rod 12 of the injection head 10 is inserted into the drug reservoir. Then, the injection head and drug reservoir are installed as a whole into the needle-free injector body. When the drug reservoir enters the internal push rod assembly 23 and moves backward until it can no longer move, the piston rod 12 and the internal push rod assembly 23 are precisely engaged and fixed together, and the drug tube 11 and the outer shell 22 are also precisely threaded together.

[0034] The next step is to compress and store energy in the actuation spring. Specifically, the outer housing 22 is rotated to move it backward relative to the base 21 (achieved through a threaded engagement between the two), causing the outer housing 22 to move the internal push rod assembly 23 backward. When the outer housing 22 is threadedly tightened relative to the base 21, the internal push rod assembly 23 is locked by a locking mechanism. During this process, the actuation spring is compressed and stores energy in preparation for the final injection step.

[0035] Next is the drug aspiration step. Specifically, the outer housing 22 is rotated to move forward relative to the base 21 (achieved through a threaded engagement between the two), while the internal push rod assembly 23 remains fixed relative to the base 21 due to being locked by the locking mechanism. In other words, during this process, the outer housing 22 moves forward relative to the internal push rod assembly 23. Since the drug tube 11 is fixed relative to the outer housing 22, and the drug reservoir and piston rod 12 are fixed relative to the internal push rod assembly 23, the drug tube 11 moves forward relative to the drug reservoir and piston rod 12. Furthermore, since the injection micro-orifice of the drug tube 11 is sealed by a cap, a drug-containing cavity appears inside the drug tube 11 when it moves forward relative to the piston rod 12. The pressure inside the drug-containing cavity is relatively low, thus allowing the liquid from the drug reservoir to be drawn into the drug-containing cavity through the drug channel in the piston rod 12, thereby completing the drug aspiration.

[0036] Finally, the injection step. In this step, the outer housing 22 and the drug tube 11 are fixed relative to the base 21, while the internal push rod assembly 23, the drug reservoir, and the piston rod 12 move forward relative to the base 21. Specifically, when injection is required, the injection actuator 30 at the rear end of the base 21 is pressed. The actuator 30 moves forward, releasing the locking mechanism from locking the internal push rod assembly 23. After being unlocked, the internal push rod assembly 23 can move forward relative to the base 21. At this time, the pressurized and energy-storing actuator spring applies a large thrust to the internal push rod assembly 23, causing it to drive the piston rod 12 forward and squeeze the drug in the drug reservoir, allowing the drug to be ejected through the injection micro-orifice.

[0037] Figure 3 An exploded view of the top cover, lens, and base is shown. Specifically, the base 21 is generally cylindrical, with one side being a longitudinal plane parallel to the axial direction. The lens 40 is disposed on this plane, and the top cover 211 is disposed on this plane. The top cover 211 is fixed to the base 21 by, for example, a snap-fit ​​engagement, and the lens 40 is disposed between the top cover 211 and the base 21. The top cover 211 has a lens receiving hole 212, the shape and size of which correspond to the lens 40, such that when the top cover 211 is assembled to the base 21, the lens 40 is received in the lens receiving hole 212 and protrudes therefrom. The lens 40 is constructed as a magnifying glass, providing magnification. A user can view the lens 40 through the lens receiving hole 212 and see magnified information such as scales and numbers, which will be described below.

[0038] The lens 40 includes a body 401 and a mounting base 402. The mounting base 402 is disposed below the body 401 and extends radially outward beyond the body 401, forming a step 403 between the body 401 and the mounting base 402. The body 401 can be a regular geometric shape, such as a dome or part of a sphere. Correspondingly, the mounting base 402 can be disc-shaped. The step 403 is annular, used to support the body 401 and facilitate lens mounting. Preferably, the body 401 and the mounting base 402 can be integrally formed as a single component. Compared with existing lenses, the lens 40 of this disclosure (especially its body 401) has a larger size and a more regular shape. The information such as numbers and scales is displayed better, more neatly, and with higher fidelity after magnification, allowing users to see the displayed information clearly, completely, and comfortably.

[0039] Accordingly, the lens receiving hole 212 can be a circular hole, but is not limited to this; it can also be any other suitable shape, such as a rectangular hole, a square hole, or other polygonal holes. On the lower surface of the upper cover 211, a fixing edge 213 extending downward from the lens receiving hole 212 is provided. The shape of the fixing edge can be annular, corresponding to the mounting base 402. When the upper cover 211 is installed onto the base 21, the fixing edge 213 abuts against the mounting base 402, specifically against and aligned with the step 403. Thus, the main body 401 protrudes from the lens receiving hole 212, while the mounting base 402 cannot pass through the lens receiving hole 212, but is blocked below and hidden by the fixing edge 213 of the lens receiving hole 212. The fixing edge 213 is in the form of an annular cylinder, and can be continuous or discontinuous in the circumferential direction, such as a half-cylinder or multiple arc segments, as long as it can abut against the mounting base 402 for fixation. In other embodiments, the step 403 of the mounting base 402 can be continuous or discontinuous, as long as the fixed edge 213 and the step 403 can be joined and fixed.

[0040] Furthermore, a protective ring 214 extending upwards around the lens receiving hole 212 is provided on the upper surface of the cover 211. Since the lens 40 protrudes from the lens receiving hole 212, the protective ring 214 protects the lens 40 from external impacts and shocks during transportation and use. For this purpose, the protective ring 214 should be positioned higher than the lens 40. Additionally, the lens 40 should be kept clean and tidy, avoiding contamination and touching to ensure clear display. The protective ring 214 surrounds and shields the lens 40, achieving this purpose. Moreover, the surface of the protective ring 214 is curved, such as a smooth and continuous curve, conforming to ergonomic design and avoiding sharp corners and edges to prevent damage to the user.

[0041] To ensure proper positioning and fixation of the lens 40 during assembly and use, and to prevent displacement, a positioning device is provided on the base 21. Specifically, as shown in... Figure 6 As shown, a positioning boss 25 is provided on the side of the lens placed on the base. The positioning boss 25 has a downwardly recessed positioning recess 26, the shape and size of which correspond to the mounting base 402 of the lens 40. The mounting base 402 of the lens 40 is placed and positioned in the positioning recess 26, providing a good fixation function. This arrangement ensures that the lens 40 is accurately positioned during assembly and does not shift during use.

[0042] A through hole 27 is provided in the positioning recess 26, which acts as a viewing window. Below the through hole is the outer surface of the outer casing 22. The scale numbers on the outer surface are aligned with the through hole and can be seen by the user through the through hole 27 and magnified by the lens 40. The scale can be numbers, representing the dosage of the medicine.

[0043] See Figure 7 The diagram shows the outer casing 22, whose surface displays numbers indicating the dosage of medication drawn by the tube 11 during the administration process. See also: Figure 2 and Figure 7 The right end of the rotating outer casing 22 has an external thread, while the right end of the base 21 has an internal thread; the two are threadedly engaged. During the drug absorption step, the drug storage bottle and piston rod 12 remain stationary with the base 21. The outer casing 22 rotates relative to the base 21 and moves forward, causing the drug tube 11 to move forward relative to the piston rod 12. A drug-containing cavity appears in the drug tube 11, and this cavity is under vacuum and negative pressure. Liquid from the drug storage bottle is drawn into the drug-containing cavity through the drug channel in the piston rod 12. The amount of drug absorbed is equal to the volume of the drug-containing cavity, which is proportional to the distance the drug tube 11 moves forward. The distance the drug tube 11 moves forward is proportional to the angle of rotation of the outer casing 22. For example, if the number of threads is set to 1, and the outer casing 22 rotates one revolution (360 degrees), the distance the medicine tube 11 moves forward is the thread pitch. The amount of medicine drawn in is calculated and experimentally measured. Similarly, when the number of threads is greater than 1, the amount of medicine drawn in one revolution of the outer casing 22 is obtained. Based on the above data, corresponding graduations are marked at corresponding positions on the outer surface of the outer casing 22. For example, if the amount of medicine drawn in one revolution of the outer casing 22 is 10 ml, then 0, 10, 20, 30, 40, 50, etc., are marked accordingly.

[0044] The outer shell 22 and base 21 of the needle-free injector are assembled such that when the outer shell 22 is screwed onto the base 21, the 0 mark on the outer shell 22 is aligned with the center of the through hole 27, and the user sees the number 0 through the lens 40, indicating that no medication has been drawn. When the user rotates the outer shell 22 one full turn, the user sees the number 10 through the lens, indicating that 10 ml of medication has been drawn. Correspondingly, the user can rotate the shell 22 a different number of times to draw the corresponding amount of medication. Similarly, the scale resolution can be set to be larger or smaller as needed, and different marks can be marked on the outer shell 22; for example, the user can see the corresponding mark even after rotating the outer shell 22 half a turn.

[0045] This invention provides a magnifying glass assembly for a needle-free injector. The magnifying glass assembly provides a wider field of view and a clearer display effect, and can be accurately positioned and securely fixed, ensuring that it does not shift, is protected from impact, and remains clean and tidy during assembly, transportation, and use.

[0046] The above description of various embodiments of this utility model is provided for descriptive purposes to a person skilled in the art. It is not intended to exclude or limit the utility model to a single disclosed embodiment. As taught above, those skilled in the art will understand that various alternatives and variations of this utility model are possible. Therefore, although some alternative embodiments have been specifically described, those skilled in the art will understand or relatively easily develop other embodiments. This utility model is intended to include all alternatives, modifications, and variations of the utility model described herein, as well as other embodiments falling within the spirit and scope of the utility model described above.

[0047] Figure label:

[0048] 100 needle-free injectors

[0049] 10 injection heads

[0050] 11 Drug Management

[0051] 12 piston rods

[0052] 20 needle-free injector body

[0053] 21 bases

[0054] 211 top cover

[0055] 212 Lens Receiving Hole

[0056] 213 Fixed Edge

[0057] 214 protective ring

[0058] 22 Outer casing

[0059] 23 Internal push rod assembly

[0060] 25 positioning boss

[0061] 26 positioning recess

[0062] 27 through hole

[0063] 30 injection actuators

[0064] 40 lens

[0065] 401 main body

[0066] 402 mounting base

[0067] 403 steps

Claims

1. A needle-free injector body, comprising: Base (21); A lens (40) is disposed on the side of the base (21); The top cover (211) is mounted to the side of the base (21) and has a lens receiving hole (212) to receive the lens (40) and expose the lens (40); The lens (40) is characterized in that it includes a body (401) and a mounting base (402) disposed below the body (401) and extending radially outward beyond the body (401), and the upper cover (211) includes a fixing edge (213) protruding downward from the lens receiving hole (212), wherein when the upper cover (211) is installed on the base (21), the fixing edge (213) abuts against the mounting base (402).

2. The needleless injector body according to claim 1, characterized in that, The base (21) is also provided with a positioning boss (25) on its side, and the positioning boss is provided with a downwardly recessed positioning recess (26), and the mounting base (402) of the lens (40) is positioned in the positioning recess (26).

3. The needleless injector body according to claim 2, characterized in that, The top cover (211) also includes a protective ring (214) that protrudes upward around the lens receiving hole (212) and is higher than the lens (40) when the top cover (211) is installed on the base (21).

4. The needleless injector body according to claim 2, characterized in that, The main body (401) of the lens (40) is dome-shaped.

5. The needleless injector body according to claim 2, characterized in that, The main body (401) of the lens (40) is part of a sphere.

6. The needleless injector body according to claim 2, characterized in that, The mounting base (402) is disc-shaped.

7. The needleless injector body according to claim 3, characterized in that, The surface of the protective ring (214) is constructed as a curved surface.

8. The needleless injector body according to claim 2, characterized in that, A through hole (27) is provided in the positioning recess (26).

9. The needleless injector body according to claim 8, characterized in that, The needleless injector body also includes an outer housing (22), which is installed in the base at the front end of the base. The outer surface of the outer housing (22) is provided with a scale, which is exposed through the through hole (27).

10. The needleless injector body according to claim 9, characterized in that, The scale indicates the dosage.

11. The needleless injector body according to claim 1, characterized in that, The fixed edge (213) is continuous.

12. The needleless injector body according to claim 1, characterized in that, The fixed edge (213) is discontinuous.

13. A needle-free injector, characterized in that, It includes a needleless injector body according to any one of claims 1 to 12 and an injection head mounted on the front end of the needleless injector body.

Images