Injection device and injection mechanism

Abstract

The utility model relates to an injection device and an injection mechanism, and the injection device comprises a medicine bottle rack and a rear cover; a limiting part is arranged at the front end of the medicine bottle frame, the rear end of the medicine bottle frame can be fixed to the rear cover in a clamped mode, and a mounting cavity used for mounting medicine bottles is defined between the limiting part and the rear cover. An elastic structure part used for abutting against the medicine bottle is further arranged on the rear side of the limiting part or the front side of the rear cover. The injection device can ensure the mounting stability of the medicine bottle and the injection precision.

Description

Technical Field

[0001] The present application relates to the technical field of injection devices, and particularly to an injection device and an injection mechanism. Background Art

[0002] The injection mechanism includes an injection device and a medicine bottle. The injection device is provided with an installation cavity for installing the medicine bottle. The medicine bottle is detachably connected to the installation cavity. During injection, the medicine bottle needs to be stably installed in the installation cavity to facilitate accurate control of the injection dose.

[0003] However, in the actual production process, due to production errors, there will inevitably be deviations in the axial dimensions of the medicine bottle and the installation cavity, resulting in the situation that the medicine bottle cannot be installed or is loose in the installation cavity, affecting the injection accuracy.

[0004] Therefore, how to ensure the installation stability of the medicine bottle and the injection accuracy is a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Utility Model

[0005] The purpose of the present application is to provide an injection device and an injection mechanism that can ensure the installation stability of the medicine bottle and the injection accuracy.

[0006] To solve the above technical problems, the present application provides an injection device, including a medicine bottle holder and a rear cover; a limiting portion is provided at the front end of the medicine bottle holder, and the rear end of the medicine bottle holder can be fixedly connected to the rear cover by snap connection, and an installation cavity for installing the medicine bottle is formed by enclosing between the limiting portion and the rear cover; an elastic structure portion for abutting against the medicine bottle is further provided at the rear side of the limiting portion or the front side of the rear cover.

[0007] Optionally, at least two limiting protrusions are provided at the front end of the medicine bottle holder and extend radially inward. The limiting protrusions are arranged at intervals in the circumferential direction to form the limiting portion. A convex block is provided at the rear side of the end of the limiting protrusion, and the convex block forms the elastic structure portion.

[0008] Optionally, the elastic structure portion is a spring, a flexible pad or a spring piece.

[0009] Optionally, the elastic structure portion is fixed to the limiting portion.

[0010] Optionally, the elastic structure portion is fixed to the limiting portion by bonding, embedding or snap connection, or the elastic structure portion and the limiting portion are integrally injection-molded.

[0011] Optionally, it further includes a pushing part. The rear cover is provided with an extension part which is coaxial with the rear cover and protrudes axially from at least one end face of the rear cover. The extension part is provided with a threaded hole. The pushing part includes a screw rod which passes through the threaded hole and is in threaded fit with the threaded hole. The end of the screw rod abuts against the rubber stopper of the medicine bottle.

[0012] Optionally, the pushing part further includes a gasket provided at the end of the screw rod, and the gasket abuts against the rear end of the rubber stopper.

[0013] Optionally, it further includes a needle. The needle includes a needle part and a fixing part for fixing the needle part. The outer peripheral wall of the front end of the medicine bottle holder is further provided with an external thread part, and the fixing part is in threaded fit and fixed with the external thread part.

[0014] Optionally, the side wall of the medicine bottle holder is further provided with a hollow hole axially.

[0015] This application also provides an injection mechanism, which includes a medicine bottle and the injection device as described above. The medicine bottle is installed in the installation cavity, and the end of the medicine bottle can abut against the elastic structure part.

[0016] The injection device and the injection mechanism provided by this application have the following technical effects:

[0017] The medicine bottle holder and the rear cover are fixed by snap connection. Specifically, during actual use, the operator can remove the rear cover, insert the medicine bottle to be used into the installation cavity, and then fix the rear cover to the medicine bottle holder by snap connection. After the injection is completed, only a little force is needed to move the rear cover backward relative to the medicine bottle holder to achieve detachment, and the disassembly and assembly operations are relatively convenient.

[0018] During the production process, it is inevitable that due to production errors, there are certain deviations between the axial length of the medicine bottle or the axial length of the installation cavity and the designed dimensions. If the axial length of the medicine bottle is greater than the axial length of the installation cavity, the medicine bottle may not be installed. If the axial length of the medicine bottle is less than the axial length of the installation cavity, the medicine bottle may easily move axially after being installed in the installation cavity, affecting the injection accuracy.

[0019] An elastic structure part is provided between the rear side of the limiting part and the front end of the medicine bottle, or an elastic structure part is provided between the front side of the rear cover and the rear end of the medicine bottle. The elastic structure part has axial elasticity and can expand and contract axially to compensate for errors. Specifically, in the design, the designed axial length of the medicine bottle can be smaller than the designed axial length of the installation cavity. The elastic structure part can be in a compressed state between the end of the installation cavity and the end of the medicine bottle, and the error is balanced through the elastic deformation of the elastic structure part. In this way, while ensuring that the medicine bottle can be smoothly installed into the installation cavity, the situation that the medicine bottle is loose in the installation cavity can be avoided, the installation stability is ensured, and the injection accuracy is further ensured.

[0020] Moreover, due to the setting of the elastic structure part, a relatively large tolerance range can be compensated, so that the production accuracy requirements can be reduced, and the production cost can be further reduced. Description of the Drawings

[0021] Figure 1 is an exploded view of an injection mechanism provided by an embodiment of the present application;

[0022] Figure 2 is a sectional view of an injection mechanism provided by an embodiment of the present application;

[0023] Figure 3 is a partial sectional view of an embodiment of the injection mechanism;

[0024] Figure 4 is a partial sectional view of another embodiment of the injection mechanism;

[0025] Figure 5 is a schematic structural view of a medicine bottle rack in the injection device.

[0026] Att Figures 1 - 5 In the drawings, the reference numerals are explained as follows:

[0027] 1. Medicine bottle rack, 11. Limiting part, 12. Protrusion, 13. Card slot, 14. External thread part, 15. Hollow hole;

[0028] 2. Rear cover, 21. Extension part;

[0029] 3. Medicine bottle, 31. Bottle body, 32. Bottle cap, 33. Rubber stopper, 34. Liquid medicine;

[0030] 4. Elastic structure part;

[0031] 5. Pushing part, 51. Screw rod, 52. Gasket;

[0032] 6. Needle head, 61. Needle part, 62. Fixing part. Detailed Embodiment

[0033] To enable those skilled in the art to better understand the technical solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] An embodiment of the present application provides an injection device and an injection mechanism. Among them, as Figure 1 and Figure 2 shown, the injection mechanism includes an injection device and a medicine bottle 3. The injection device is provided with an installation cavity for installing the medicine bottle 3. After installing the medicine bottle 3 in the installation cavity, injection operations can be performed through the injection device.

[0035] Specifically, as Figure 1 and Figure 2 shown, the injection device includes a medicine bottle holder 1, a rear cover 2, a pushing part 5 and a needle 6. Among them, a limiting part 11 is provided at the front end of the medicine bottle holder 1. The rear end of the medicine bottle holder 1 can be detachably connected to the rear cover 2. And after the medicine bottle holder 1 and the rear cover 2 are fixed, the above-mentioned installation cavity can be formed by enclosing between the limiting part 11 and the rear cover 2.

[0036] As Figure 2 shown, the medicine bottle 3 includes a bottle body 31, a bottle cap 32 and a rubber stopper 33. The bottle cap 32 covers the front end of the bottle body 31. The bottle body 31 is filled with a liquid medicine 34. The rubber stopper 33 is arranged at the rear side of the bottle body 31 and is used to block the liquid medicine 34. The rubber stopper 33 can move along the axial direction of the bottle body 31 and push the liquid medicine 34 to flow towards the side of the bottle cap 32. After installing the medicine bottle 3 in the installation cavity, the pushing part 5 can push the rubber stopper 33 from the rear side, so that the liquid medicine in the medicine bottle 3 flows forward and is ejected from the needle 6.

[0037] The medicine bottle holder 1 and the rear cover 2 are fixed by snap connection. The rear cover 2 is provided with a first snap connection structure, and the rear end of the medicine bottle holder 1 is provided with a second snap connection structure. The rear cover 2 is snap-connected to the medicine bottle holder 1 through the first snap connection structure and the second snap connection structure. Specifically, during actual use, the operator can remove the rear cover 2, insert the medicine bottle 3 to be used into the installation cavity, and then fix the rear cover 2 to the medicine bottle holder 1 by snap connection. After the injection is completed, only by slightly pushing the rear cover 2 backward relative to the medicine bottle holder 1 can the first snap connection structure and the second snap connection structure be disengaged, and the disassembly and assembly operations are relatively convenient.

[0038] During the production process, due to inevitable production errors, there may be certain deviations between the axial length of the medicine bottle 3 or the axial length of the installation cavity and the designed dimensions. If the axial length of the medicine bottle 3 is greater than the axial length of the installation cavity, the medicine bottle 3 may not be installed. If the axial length of the medicine bottle 3 is less than the axial length of the installation cavity, after the medicine bottle 3 is installed in the installation cavity, it may easily move axially, affecting the injection accuracy.

[0039] In this embodiment, an elastic structure portion 4 is provided between the rear side of the limiting portion 11 and the front end of the medicine bottle 3, or an elastic structure portion 4 is provided between the front side of the rear cover 2 and the rear end of the medicine bottle 3. The elastic structure portion 4 has axial elasticity and can expand and contract axially, so as to compensate for errors. Specifically, in design, the designed axial length of the medicine bottle 3 can be less than the designed axial length of the installation cavity. The elastic structure portion 4 can be in a compressed state between the end of the installation cavity and the end of the medicine bottle 3, and the error is balanced through the elastic deformation of the elastic structure portion 4. In this way, while ensuring that the medicine bottle 3 can be smoothly installed into the installation cavity, the situation that the medicine bottle 3 is loose in the installation cavity can be avoided, the installation stability is ensured, and the injection accuracy is further ensured.

[0040] Moreover, due to the setting of the elastic structure portion 4, a relatively large tolerance range can be compensated, so that the production accuracy requirement can be reduced, and the production cost can be further reduced.

[0041] After the medicine bottle 3 is installed in the installation cavity, the limiting portion 11 can limit the bottle cap 32, and the rear cover 2 can limit the rear end of the bottle body 31. Specifically, the rear cover 2 acts on the rear end face of the side wall of the bottle body 31 to achieve the limit. The elastic structure portion 4 can be provided between the limiting portion 11 and the bottle cap 32, or the elastic structure portion 4 can also be provided between the rear end of the bottle body 31 and the rear cover 2.

[0042] When the elastic structure portion 4 is provided between the limiting portion 11 and the bottle cap 32, the acting area between the elastic structure portion 4 and the end of the medicine bottle 3 can be increased, which is convenient for the installation operation and can simplify the design and installation.

[0043] Since the medicine bottle 3 needs to be replaced while the injection device can be reused, the elastic structure portion 4 is fixedly provided on the limiting portion 11 or the rear cover 2, and the elastic structure portion 4 can be reused, effectively reducing the cost. Moreover, during the disassembly and assembly process of the medicine bottle, the disassembly and assembly operations of other components are not increased, and the assembly stability can be ensured, with low cost and convenient operation.

[0044] In this embodiment, there is no limitation on the specific structure of the elastic structure portion 4, such as Figure 3As shown in the figure, taking the elastic structure part 4 fixedly arranged on the limiting part 11 as an example, at least two limiting protrusions are arranged radially inwards along the front end of the medicine bottle rack 1, and the limiting protrusions are arranged at intervals in the circumferential direction to form the above-mentioned limiting part 11. A convex block 12 is arranged on the rear side of the end part (i.e., the end part radially inwards) of the limiting protrusion. The limiting protrusion forms a structure similar to an elastic arm. After the medicine bottle 3 is installed in the installation cavity, the front end (the bottle cap 32) of the medicine bottle 3 can abut against the convex block 12 and push the convex block 12 forward. The convex block 12 can drive the limiting protrusion forward under the forward thrust, so that the limiting protrusion undergoes elastic deformation and bends forward. At the same time, the limiting protrusion has a tendency to recover to its original state backward, and the bottle cap 32 is tightened by the convex block 12, so that the medicine bottle 3 can be stably installed in the installation cavity.

[0045] In this embodiment, it is preferably to integrally form the convex block 12 and the limiting protrusion, as Figure 2 shown. In this way, the forming process and the installation operation can be simplified. Of course, the part and the limiting protrusion can also be independent of each other and fixed by bonding, clamping and other methods, and no specific limitation is made here.

[0046] Alternatively, in this embodiment, the elastic structure part 4 can also be set to the structure of a spring, a flexible pad or an elastic sheet. At this time, the structure of the limiting part 11 is not limited. For example, the limiting part 11 can be at least two limiting protrusions arranged radially inwards, or can also be an annular protrusion. The elastic structure part 4 is clamped between the limiting part 11 and the bottle cap 32, and can be specifically fixed to the limiting part 11 to simplify the disassembly and assembly operation and avoid the situation that the elastic structure part 4 falls off and is lost.

[0047] Specifically, as Figure 4 shown, the elastic structure part 4 can be fixed to the limiting part 11 by bonding, clamping and other methods. Alternatively, an installation groove can be arranged on the rear side of the limiting part 11, and the front end of the elastic structure part 4 can be embedded in the installation groove. Or when the elastic structure part 4 is a metal part, the elastic structure part 4 and the limiting part 11 can be integrally injection-molded during the injection molding process of the medicine bottle rack 1, so that the front end of the elastic structure part 4 can be fixed to the limiting part 11.

[0048] As Figure 1 and Figure 2 shown, the pushing part 5 is connected to the rear cover 2 and can push the rubber stopper 33 to move axially in the medicine bottle 3. The specific structure of the pushing part 5 is not limited in this embodiment. As Figure 1 and Figure 2 shown, the pushing part 5 includes a screw rod 51. In the installation state, the end part of the screw rod 51 can abut against the rubber stopper 33 of the medicine bottle 3 located in the installation cavity. The rear cover 2 is provided with an extension part 21, and the extension part 21 is coaxial with the rear cover 2 and protrudes axially from at least one end face of the rear cover 2. It can be as Figure 1 and Figure 2The extension part protrudes from the rear side surface of the rear cover 2, and it can also protrude from the front side surface of the rear cover 2. The extension part 21 is provided with a threaded hole, and the screw rod 51 passes through the threaded hole and is in threaded cooperation with the threaded hole. The screw rod 51 can achieve axial movement by rotating relative to the rear cover 2, and then push the rubber plug 33 to move forward axially.

[0049] The setting of the extension part 21 can increase the length and structural strength of the threaded hole, ensure the stability of the connection between the screw rod 51 and the rear cover 2, avoid the situation that the screw rod 51 tilts or even gets stuck during the rotational movement, and ensure that the pushing part 5 can smoothly push the rubber plug 33 to move axially to achieve injection.

[0050] The pushing part 5 further includes a gasket 52 provided at the end of the screw rod 51. In the installed state, the end of the screw rod 51 can abut against the gasket 52, and the gasket 52 can abut against the rear end face of the rubber plug 33. By rotating the screw rod 51, the gasket 52 can be pushed to move axially, and the rubber plug 33 can be pushed to move axially through the gasket 52. The setting of the gasket 52 can increase the contact area between the end of the bolt and the rubber plug 33, ensure the stability of the pushing effect. At the same time, the screw rod 51 needs to rotate to achieve axial movement, while the gasket 52 can be non-rotating, avoiding the situation that the screw rod 51 damages the rear side surface of the rubber plug 33 and resulting in the inability to guarantee the injection accuracy.

[0051] Specifically, in this embodiment, there is no limitation on the structure of the gasket 52. The gasket 52 can be rotatably connected to the end of the screw rod 51, or the gasket 52 can also be a separate component and can be installed between the rubber plug 33 and the end of the screw rod 51 during installation.

[0052] In this embodiment, the first clamping structure is a clamping projection, and the second clamping structure is a corresponding clamping groove 13. The clamping and fixing are achieved through the clamping projection and the clamping groove 13, which can make the structure simple and the processing cost low.

[0053] The number of clamping projections is at least two, and the clamping projections are evenly spaced along the circumferential direction. Correspondingly, the number of clamping grooves 13 is the same as the number of clamping projections and is evenly spaced along the circumferential direction. Each clamping projection and each clamping groove 13 are clamped correspondingly, which can not only achieve clamping and fixing, but also prevent the rear cover 2 from rotating relative to the medicine bottle holder 1, so that during the process of injection by rotating the screw rod 51, the rear cover 2 is prevented from rotating, ensuring the injection accuracy.

[0054] Of course, in this embodiment, the first clamping structure can also be set as a clamping groove, and the second clamping structure can be set as a clamping projection.

[0055] Such as Figure 1 and Figure 2As shown, the needle 6 includes a needle portion 61 and a fixing portion 62, wherein the fixing portion 62 is used to fix the needle portion 61. An external thread portion 14 is further provided on the outer peripheral wall of the front end of the medicine bottle holder 1, and the fixing portion 62 can be fixedly engaged with the external thread portion 14 by threading. In the installed state, the rear end of the needle portion 61 can pass through the end cap of the medicine bottle 3 and be inserted into the bottle body 31 to communicate with the inside of the bottle body 31. Under the pushing action of the pushing portion 5, the pressure inside the bottle body 31 increases, and the liquid medicine 34 can be discharged from the needle portion 61, thereby realizing injection.

[0056] As Figure 5 shown, a hollow hole 15 is further provided along the axial direction on the side wall of the medicine bottle holder 1. The provision of the hollow hole 15 can facilitate the observation of the amount of liquid medicine in the medicine bottle 3. Specifically, a scale can also be provided on the side wall of the hollow hole 15 to facilitate the observation of the amount of liquid medicine in the medicine bottle 3. Alternatively, the amount of liquid medicine in the medicine bottle 3 can also be calculated by the feeding length of the screw rod 51. There is no specific limitation here.

[0057] It should be noted that in this embodiment, "front" refers to the side facing the needle 6, and "rear" refers to the side away from the needle 6.

[0058] The above is only the preferred embodiment of the present application. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An injection device, characterized in that: It comprises a medicine bottle rack (1) and a rear cover (2); A limiting portion (11) is provided at the front end of the medicine bottle rack (1), and a rear end of the medicine bottle rack (1) can be fixed to the rear cover (2) by snapping, and a mounting cavity for mounting a medicine bottle (3) is formed between the limiting portion (11) and the rear cover (2); The rear side of the limiting portion (11) or the front side of the rear cover (2) is also provided with an elastic structure portion (4) for abutting against the medicine bottle (3).

2. The injection device according to claim 1, characterized in that At least two limiting protrusions are provided radially inwardly at the front end of the medicine bottle rack (1), and the limiting protrusions are arranged at intervals along the circumferential direction to form the limiting portion (11). A protrusion (12) is provided at the rear side of the end of the limiting protrusion, and the protrusion (12) forms the elastic structure portion (4).

3. The injection device according to claim 1, characterized in that The elastic structure part (4) is a spring, a flexible pad or a spring sheet.

4. The injection device according to claim 3, characterized in that The elastic structure portion (4) is fixed to the limiting portion (11).

5. The injection device according to claim 4, characterized in that The elastic structure part (4) is fixed to the limiting part (11) by bonding, embedding or clamping, or the elastic structure part (4) and the limiting part (11) are integrally injection-molded.

6. The injection device according to any one of claims 1 to 5, characterized in that: The invention also comprises a pushing portion (5), wherein the rear cover (2) is provided with an extending portion (21), wherein the extending portion (21) is coaxial with the rear cover (2) and protrudes axially from at least one side end surface of the rear cover (2), wherein the extending portion (21) is provided with a threaded hole, and the pushing portion (5) comprises a screw rod (51), wherein the screw rod (51) passes through the threaded hole and is threadably engaged with the threaded hole, and an end portion of the screw rod (51) abuts against a rubber plug (33) of the medicine bottle (3).

7. The injection device according to claim 6, characterized in that The pushing portion (5) further comprises a gasket (52) provided at the end of the screw rod (51), wherein the gasket (52) abuts against the rear end of the rubber plug (33).

8. The injection device according to any one of claims 1 to 5, characterized in that: The medicine bottle holder (1) further comprises a needle head (6), the needle head (6) comprising a needle portion (61) and a fixing portion (62) for fixing the needle portion (61); the front end peripheral wall of the medicine bottle holder (1) is further provided with an external threaded portion (14), the fixing portion (62) being threadably matched and fixed to the external threaded portion (14).

9. The injection device according to any one of claims 1 to 5, characterized in that: The side wall of the medicine bottle rack (1) is also provided with a hollow hole (15) along the axial direction.

10. An injection mechanism, characterized in that: It comprises a medicine bottle (3) and an injection device according to any one of claims 1 to 9, wherein the medicine bottle (3) is installed in the installation cavity, and the end of the medicine bottle (3) can abut against the elastic structure (4).

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