Dose display mechanism of needleless injector and needleless injector

Abstract

The utility model relates to the technical field of needleless injectors, in particular to a dose display mechanism of a needleless injector and the needleless injector, the needleless injector comprises an outer sleeve, an inner sleeve located in the outer sleeve and a piston assembly located in the inner sleeve and used for sucking liquid medicine in the relative movement process of the outer sleeve and the inner sleeve, the dose display mechanism is located between the inner sleeve and the outer sleeve and comprises dose scales located on the wall face of the inner sleeve, a lens arranged in the outer sleeve and used for amplifying the dose scales and a positioning buckle used for being arranged above the lens in a covering mode so as to limit the lens between the lens and the outer sleeve. The positioning buckle is clamped with the outer sleeve; according to the utility model, the positioning buckle is arranged above the lens to press the lens, so that the lens is limited between the positioning buckle and the outer sleeve, the lens fixing effect is improved, and the phenomenon of deflection or crushing caused by directly pressing the lens into the outer sleeve is also avoided.

Description

Technical Field

[0001] This utility model relates to the field of needle-free injector technology, and in particular to a needle-free injector dosage display mechanism and a needle-free injector. Background Technology

[0002] Needle-free injectors use a high-speed airflow to diffuse and inject medication subcutaneously. Because the medication enters the subcutaneous tissue in a diffused manner, it is evenly dispersed and less likely to clog tiny lymphatic vessels. Furthermore, since no needle is needed, the chance of bacterial infection is effectively reduced, and the risks of needle scratches or breakage are eliminated. To adjust the dosage during injection, graduations are typically marked on the inner cannula, and a lens is installed on the outer cannula to magnify these graduations.

[0003] Chinese patent application number CN202020766378.3 discloses a needleless injector. The surface of the syringe is engraved with scales, and a window is opened on the side wall of the upper shell to display the adjustable scale label. As can be seen from the attached drawings, the magnifying glass is embedded in the window, but the stability is not high, and the magnifying glass is easy to bend or be damaged when it is directly pressed into the window. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in order to solve the problem that the magnifying glass of the needle-free injector is not firmly embedded in the window in the prior art, and that the magnifying glass is easy to bend or be damaged when it is directly pressed into the window, a needle-free injector dosage display mechanism and a needle-free injector are provided.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a needleless injector dosage display mechanism, wherein the needleless injector includes an outer sleeve, an inner sleeve located inside the outer sleeve, and a piston assembly located inside the inner sleeve and drawing liquid during relative movement between the outer sleeve and the inner sleeve, the dosage display mechanism being located between the inner sleeve and the outer sleeve, characterized in that: the dosage display mechanism includes a dosage scale located on the wall of the inner sleeve, a lens disposed inside the outer sleeve for magnifying the dosage scale, and a positioning buckle disposed above the lens to limit the lens between the lens and the outer sleeve, the positioning buckle being engaged with the outer sleeve.

[0006] Furthermore, the positioning buckle includes an insert portion that is embedded in the outer sleeve and a pressing portion for pressing on the lens, wherein the inner peripheral wall of the pressing portion forms an observation hole.

[0007] Furthermore, the outer sleeve has a receiving groove for accommodating the lens and an embedding groove for embedding the outer sleeve. The embedding groove and the positioning buckle are respectively provided with a snap-fit ​​protrusion and a snap-fit ​​groove, and the snap-fit ​​protrusion snaps into the snap-fit ​​groove.

[0008] Furthermore, the snap-fit ​​groove is located within the embedding groove, and the snap-fit ​​protrusion is located on the positioning buckle. The snap-fit ​​protrusion snaps into the snap-fit ​​groove, and the two are glued together.

[0009] Furthermore, the outer sleeve has an annular protrusion protruding radially, and the insert groove is located on the annular protrusion and is recessed from the annular protrusion toward the outer sleeve, so that the outer sleeve has a limiting part for axially limiting the positioning buckle at the parts on both sides of the positioning buckle.

[0010] Furthermore, the bottom of the receiving groove is provided with a through hole extending into the inner sleeve, and the through hole is directly opposite the observation hole.

[0011] Furthermore, the wall of the receiving groove protrudes radially to form a supporting step for supporting the lens, and there is a gap between the supporting step and the bottom of the receiving groove.

[0012] Furthermore, the lens includes a first end face that fits against the pressing part, a second end face that is opposite to the first end face and cooperates with the supporting step, and a wall surface that connects the first end face and the second end face. The first end face is hemispherical or spherical, and the wall surface fits against the inner peripheral wall of the embedding part.

[0013] A needle-free injector includes the aforementioned needle-free injector dosage display mechanism.

[0014] The beneficial effects of this utility model are as follows: This utility model uses a positioning buckle above the lens to press the lens down, thereby limiting it between the positioning buckle and the outer sleeve. This improves the lens fixing effect and avoids the skewing or damage caused by directly pressing the lens into the outer sleeve. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a 3D schematic diagram of a needle-free injector;

[0017] Figure 2 This is the front view of a needle-free injector;

[0018] Figure 3 This is a cross-sectional view of a needle-free injector;

[0019] Figure 4 This is an exploded view of this utility model;

[0020] Figure 5 This is a 3D schematic diagram of the outer casing;

[0021] Figure 6 This is a 3D diagram of the positioning buckle:

[0022] 1. Outer sleeve; 101. Receiving groove; 102. Embedding groove; 103. Snap-fit ​​groove; 104. Annular protrusion; 105. Limiting part; 106. Through hole; 107. Supporting step;

[0023] 2. Inner sleeve; 201. Dosage scale;

[0024] 3. Piston assembly;

[0025] 4. Lens; 401. First end face; 402. Second end face; 403. Wall surface;

[0026] 5. Positioning buckle; 501. Embedding part; 502. Pressing part; 503. Observation hole; 504. Snap-fit ​​protrusion. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0028] like Figures 1-3 As shown, a needle-free injector dosage display mechanism is disclosed. The needle-free injector includes an outer sleeve 1, an inner sleeve 2 located inside the outer sleeve 1, and a piston assembly 3 located inside the inner sleeve 2 that draws in liquid medication during relative movement between the outer sleeve 1 and the inner sleeve 2. The dosage display mechanism is located between the inner sleeve 2 and the outer sleeve 1. In this embodiment, the inner sleeve 2 is fixed, while the outer sleeve 1 is movable and is an annular sleeve, including an outer ring and an inner ring. The inner sleeve 2 is located between the outer ring and the inner ring and is threadedly connected to the inner ring. The inner ring of the outer sleeve 1 can drive the piston assembly 3 to rotate and move backward through a linkage mechanism to draw in liquid medication.

[0029] like Figure 4 As shown, the dosage display mechanism is used to display the dosage of the aspirated drug solution. It includes a dosage scale 201 on the outer peripheral wall of the inner sleeve 2, a lens 4 set inside the outer sleeve 1 for magnifying the dosage scale 201, and a positioning buckle 5 for covering the lens 4 to limit the lens 4 between it and the outer sleeve 1. The positioning buckle 5 is engaged with the outer sleeve 1. In this embodiment, the lens 4 is fixed by setting the positioning buckle 5 above the lens 4. When the outer sleeve 1 is rotated, it gradually moves backward. The lens 4 fixed inside the outer sleeve 1 and the piston assembly 3 connected to the outer sleeve 1 through the linkage mechanism move backward synchronously. The piston assembly 3 aspirates the drug solution, and the lens 4 can magnify the dosage scale 201 to facilitate observation of the aspirated drug solution dosage.

[0030] In some examples, such as Figure 6 As shown, the positioning buckle 5 includes an embedding part 501 embedded in the outer sleeve 1 and a pressing part 502 for pressing on the lens 4. The pressing part 502 is formed by extending the embedding part 501 towards the center and pressing on the edge of the lens 4. The inner peripheral wall of the pressing part 502 forms an observation hole 503, through which the dosage of the medicine can be observed.

[0031] In some examples, such as Figure 5 As shown, the outer sleeve 1 has a receiving groove 101 for accommodating the lens 4 and an inserting groove 102 for inserting the inserting part 501 of the outer sleeve 1. The inserting groove 102 and the positioning buckle 5 are respectively provided with a snap-fit ​​protrusion 504 and a snap-fit ​​groove 103. The snap-fit ​​protrusion 504 snaps into the snap-fit ​​groove 103. The number of snap-fit ​​protrusions 504 and snap-fit ​​grooves 103 corresponds, and the number can be, but is not limited to, one, two or three. During installation, the lens 4 is first placed into the receiving groove 101, and then the positioning buckle 5 is inserted into the inserting groove 102. At the same time, the snap-fit ​​protrusion 504 snaps into the snap-fit ​​groove to fix the positioning buckle 5 to the outer sleeve 1.

[0032] In some examples, such as Figure 5 As shown, in order to facilitate the injection of adhesive into the snap-fit ​​groove 103, the snap-fit ​​groove 103 is located in the embedding groove 102, and the snap-fit ​​protrusion 504 is located on the positioning buckle 5. After the snap-fit ​​protrusion 504 is snapped into the snap-fit ​​groove 103 and fixed, the adhesive will bond the two together, which further improves the connection strength between the outer sleeve 1 and the positioning buckle 5.

[0033] In some examples, such as Figure 4 As shown, the outer sleeve 1 has an annular protrusion 104 protruding radially, and the embedding groove 102 is located on the annular protrusion 104 and is recessed from the annular protrusion 104 toward the outer sleeve 1, so that the outer sleeve 1 has a limiting part 105 for axially limiting the positioning buckle 5 at the parts on both sides of the positioning buckle 5. The two limiting parts 105 clamp the positioning buckle 5 in the middle, which can prevent the positioning buckle 5 from axially shifting.

[0034] In some examples, such as shown in 3, the bottom of the receiving groove 101 is provided with a through hole 106 extending into the inner sleeve 2. The through hole 106 is directly opposite the observation hole 503. The shape of the through hole 106 and the observation hole 503 can be, but is not limited to, regular or irregular shapes such as circles or rectangles. When it is rectangular, the corners are rounded. The cross-sectional area of ​​the observation hole 503 is larger than the cross-sectional area of ​​the through hole 106. The snap-fit ​​grooves 103 are evenly distributed around the through hole 106. The operator can observe the dose scale 201 by sequentially passing through the observation hole 503, the lens 4, and the through hole 106.

[0035] In some examples, such as Figure 5As shown, the wall of the receiving groove 101 protrudes radially to form a supporting step 107 for supporting the lens 4, and there is a gap between the supporting step 107 and the bottom of the receiving groove 101.

[0036] In some examples, such as Figure 4 As shown, the lens 4 includes a first end face 401 that fits against the pressing part 502, a second end face 402 that is opposite to the first end face 401 and cooperates with the supporting step 107, and a wall surface 403 that connects the first end face 401 and the second end face 402. The first end face 401 is hemispherical or spherical to achieve the magnification effect of the lens 4. The wall surface 403 is a cylindrical structure and fits against the inner peripheral wall of the embedding part 501. The supporting step 107, the embedding part 501 and the pressing part 502 cooperate to define the position of the lens 4.

[0037] Working principle:

[0038] During installation, first place the lens 4 into the receiving groove 101, then inject adhesive into the snap-fit ​​groove 103, and then insert the positioning buckle 5 into the embedding groove 102. At the same time, the snap-fit ​​protrusion 504 is snapped into the snap-fit ​​groove 103, and the adhesive will fix the two together. At this time, the positioning buckle 5 is fixed to the outer sleeve 1. The pressing part 502 of the outer sleeve 1 presses down on the edge of the lens 4. The inner peripheral wall of the pressing part 502 forms an observation hole 503. The operator can observe the dosage of the medicine by passing through the observation hole 503, the lens 4 and the through hole 106 in sequence.

[0039] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dosage display mechanism for a needleless injector, the needleless injector comprising an outer sleeve (1), an inner sleeve (2) located inside the outer sleeve (1), and a piston assembly (3) located inside the inner sleeve (2) and drawing liquid medication during relative movement between the outer sleeve (1) and the inner sleeve (2), the dosage display mechanism being located between the inner sleeve (2) and the outer sleeve (1), characterized in that: The dose display mechanism includes a dose scale (201) located on the outer peripheral wall of the inner sleeve (2), a lens (4) disposed inside the outer sleeve (1) for magnifying the dose scale (201), and a positioning buckle (5) for covering the lens (4) to limit the lens (4) between it and the outer sleeve (1), the positioning buckle (5) being engaged with the outer sleeve (1).

2. The needle-free injector dosage display mechanism according to claim 1, characterized in that: The positioning buckle (5) includes an insert portion (501) that is embedded in the outer sleeve (1) and a pressing portion (502) for pressing on the lens (4). The inner peripheral wall of the pressing portion (502) forms an observation hole (503).

3. The needle-free injector dosage display mechanism according to claim 2, characterized in that: The outer sleeve (1) has a receiving groove (101) for accommodating the lens (4) and an embedding groove (102) for embedding the embedding part (501) of the outer sleeve (1). The embedding groove (102) and the positioning buckle (5) are respectively provided with a snap-fit ​​protrusion (504) and a snap-fit ​​groove (103). The snap-fit ​​protrusion (504) snaps into the snap-fit ​​groove (103).

4. The needle-free injector dosage display mechanism according to claim 3, characterized in that: The snap-fit ​​groove (103) is located in the embedding groove (102), and the snap-fit ​​protrusion (504) is located on the positioning buckle (5). The snap-fit ​​protrusion (504) is snapped into the snap-fit ​​groove (103) and the two are glued together.

5. The needle-free injector dosage display mechanism according to claim 3, characterized in that: The outer sleeve (1) has an annular protrusion (104) protruding radially. The embedding groove (102) is located on the annular protrusion (104) and is recessed from the annular protrusion (104) toward the outer sleeve (1), so that the outer sleeve (1) has a limiting part (105) for axially limiting the positioning buckle (5) at the part on both sides of the positioning buckle (5).

6. The needle-free injector dosage display mechanism according to claim 3, characterized in that: The bottom of the receiving groove (101) is provided with a through hole (106) extending into the inner sleeve (2), and the through hole (106) is directly opposite the observation hole (503).

7. The needle-free injector dosage display mechanism according to claim 3, characterized in that: The wall of the receiving groove (101) protrudes radially to form a supporting step (107) for supporting the lens (4), and there is a gap between the supporting step (107) and the bottom of the receiving groove (101).

8. The needle-free injector dosage display mechanism according to claim 7, characterized in that: The lens (4) includes a first end face (401) that fits against the pressing part (502), a second end face (402) that is opposite to the first end face (401) and cooperates with the supporting step (107), and a wall surface (403) that connects the first end face (401) and the second end face (402). The first end face (401) is hemispherical or spherical, and the wall surface (403) fits against the inner peripheral wall of the embedding part (501).

9. A needle-free injector, characterized in that: Includes the needleless injector dosage display mechanism as described in any one of claims 1-8.

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