CN219558338U - Disposable low-resistance self-destroying injector - Google Patents

Abstract

The utility model relates to the technical field of syringes, and particularly discloses a disposable low-resistance self-destruction syringe which comprises a cylinder, a rubber plug support, a rubber plug and a core rod, wherein the rubber plug is sleeved outside the rubber plug support, the core rod is assembled in the rubber plug support, and a space for the rubber plug support to slide upwards is reserved in the core rod and above the assembling surface of the rubber plug support; after the core rod, the rubber plug support and the rubber plug are assembled, the corresponding part of the core rod is attached to the bottom of the rubber plug, and a gap is reserved between the top surface of the pushing table part of the core rod and the bottom surface of the rubber plug support. Compared with the prior art that the rubber plug bulge is deformed by utilizing the instant pressure difference generated by liquid pumping or liquid injection, the rubber plug bulge is deformed by utilizing the rubber plug support to realize mechanical compression on the rubber plug, the deformation is more reliable and stable, the deformation amount is relatively large, and the sealing performance can be well ensured.

Description

Disposable low-resistance self-destroying injector

Technical Field

The utility model relates to the technical field of syringes, in particular to a disposable low-resistance self-destroying syringe.

Background

The self-destroying injector is a disposable injector product which can effectively prevent repeated use after being used, and after the injection is finished, the push rod can not be pulled out from the needle cylinder by relying on manual or mechanical force, thereby achieving the purposes of self locking, or the sealing performance of the piston is destroyed, and the like, and finally achieving the aim of preventing the repeated use. When the self-destruction injector is designed, the friction force between the rubber plug and the inner wall of the injector cylinder body is difficult to design, if the interference magnitude between the cylinder body and the rubber plug is too large, the sliding performance is affected, an operator needs to use a larger initial pushing force to move the rubber plug, and the injection liquid rate is easy to be uneven, but if the interference magnitude between the cylinder body and the rubber plug is designed to be small, leakage can occur.

Aiming at the situation, in the prior art, the bulge is usually arranged outside the rubber plug Zhou Chengxing and is contacted with the inner wall of the cylinder body, so that the contact area between the rubber plug and the inner wall of the cylinder body is reduced, and the bulge is deformed through the pressure difference between the inside and the outside of the cylinder body when liquid is pumped or injected, so that the sealing is realized, and leakage is prevented, and the low-resistance injector disclosed in CN2020115190979 and CN2020216476273 is realized by designing the bulge on the rubber plug. However, when the liquid is slowly pumped or injected, the pressure difference between the inside and the outside of the cylinder is relatively small in a certain period of time, the deformation of the bulge is limited, and leakage still occurs.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a disposable low-resistance self-destruction injector with more reasonable structural design.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the disposable low-resistance self-destruction injector comprises a cylinder body, a rubber plug support, a rubber plug and a core rod, and is characterized in that the rubber plug is sleeved on the rubber plug support, the core rod is assembled in the rubber plug support, and a space for the rubber plug support to slide upwards is reserved in the core rod and above the assembling surface of the rubber plug support; after the core rod, the rubber plug support and the rubber plug are assembled, the corresponding part of the core rod is attached to the bottom of the rubber plug, and a gap is reserved between the top surface of the pushing table part of the core rod and the bottom surface of the rubber plug support.

Preferably, the rubber plug support comprises an expansion table part, a sealing table part and a support round table part, wherein the support round table part is of a cylindrical structure, the expansion table part is formed at the top of the support round table part, the expansion table part is of a round table shape with a large upper part and a small lower part, the minimum diameter of the expansion table part is larger than the outer diameter of the support round table part, the sealing table part is formed between the expansion table part and the support round table part, and an inverted eight-shaped pull-back table part is formed at a position corresponding to the inner wall of the support round table part; the rubber plug is of a hollow structure, an assembly inclined plane matched with the expansion table part of the rubber plug support is formed on the inner wall of the top of the rubber plug, an outward bulge is formed at the rubber plug part corresponding to the assembly inclined plane, the outer wall of the bulge is attached to the inner wall of the cylinder, an inner hole matched with the outer wall of the round table part of the support of the rubber plug support is formed below the assembly inclined plane, and a buffer ring is formed at the bottom of the rubber plug; the head end of the core rod is a clamping table part, the clamping table part is assembled on a pull-back table part in the inner cavity of the round table part of the rubber plug support, a pushing table part is designed on the core rod and positioned at the lower part of the clamping table part, after the core rod, the rubber plug support and the rubber plug are assembled, the pushing table part of the core rod is attached to the bottom of a buffer ring of the rubber plug, and a gap is reserved between the top surface of the pushing table part of the core rod and the bottom surface of the rubber plug support.

Preferably, a triangular bulge rib is formed between the assembly inclined plane and the inner hole wall, and the bottom surface of the expansion table part of the rubber plug support is pressed on the triangular bulge rib after the rubber plug is assembled with the rubber plug support. The tightness between the rubber plug supports is enhanced.

Preferably, a lock stand part is formed at the top center of the expansion stand part, and a lock hook is arranged outside the lock stand part Zhou Chengxing; correspondingly, locking teeth which are mutually locked with the locking hooks are formed on the inner wall of the liquid outlet of the cylinder body. The design of the scheme realizes the self-destruction of the injector.

Compared with the prior art, the utility model has the following beneficial effects:

according to the utility model, through the specific structural designs of the rubber plug support, the rubber plug, the core rod and the like, when liquid is pulled, the rubber plug is extruded through the expansion table part of the rubber plug support, so that the rubber plug part corresponding to the assembly inclined plane is deformed outwards, the contact area between the rubber plug bulge and the cylinder body is increased, and the tightness between the rubber plug and the cylinder body is improved; when liquid is injected, the core rod is pushed, the rubber plug is pushed by the clamping table part on the core rod, the rubber plug is extruded by the rubber plug bracket to enable the bulge of the rubber plug to deform outwards, and the contact area between the rubber plug bulge and the cylinder is increased; compared with the prior art that the rubber plug bulge is deformed by utilizing the instant pressure difference generated by liquid pumping or liquid injection, the rubber plug bulge is deformed by utilizing the rubber plug support to realize mechanical compression on the rubber plug, the deformation is more reliable and stable, the deformation amount is relatively large, and the sealing performance can be well ensured.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of the structural position of the locking element on the cylinder according to the present utility model;

FIG. 3 is a schematic view of a core rod according to the present utility model;

FIG. 4 is a schematic structural view of the rubber plug support of the present utility model;

FIG. 5 is a schematic view of the structure of the rubber plug according to the present utility model;

FIG. 6 is a schematic diagram of an assembled structure of the core rod, the plug support and the plug according to the present utility model;

FIG. 7 is a schematic diagram of the self-destructed structure of the present utility model;

the device comprises a cylinder body, 11, a locking tooth, 2, a rubber plug support, 21, a locking table part, 22, an expansion table part, 23, a sealing table part, 24, a support round table part, 25, a pull-back table part, 3, a rubber plug, 31, an assembly inclined plane, 32, a triangular bulge rib, 33, a rubber plug bulge, 34, a straight cylinder wall, 35, a buffer ring, 4, a core rod, 41, a clamping table part, 42 and a pushing table part.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model. In addition, the terms "fixedly connected" and "fixed" are used herein in the prior art, and are conventional fixing methods, such as gluing. And the parts not described in detail below should be performed as in the prior art.

In the present utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal", and the like refer to the azimuth or positional relationship based on the azimuth or positional relationship shown in the drawings. These terms are only used to better describe the present utility model and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations. Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present utility model will be understood by those of ordinary skill in the art according to the specific circumstances. Furthermore, the following Wen Weixiang sections are all made with reference to the prior art.

As shown in figures 1-7, the disposable low-resistance self-destruction injector comprises a cylinder body 1, a rubber plug support 2, a rubber plug 3 and a core rod 4. Wherein, a liquid outlet is formed in the center of one end of the cylinder body 1, and a locking tooth 11 is formed on the inner wall of the liquid outlet; the rubber plug support 2 is formed by integrally forming a lock platform part 21, an expansion platform part 22, a sealing platform part 23 and a support platform part 24, wherein the lock platform part 21 is formed at the top center of the expansion platform part 22, a lock hook which is tightly interlocked with a lock tooth 11 is formed on the peripheral wall of the lock platform part 21, the expansion platform part 22 is in a shape of a round platform with a large upper part and a small lower part (namely, the periphery of the expansion platform part 22 is a conical surface in an inverted splayed shape), the sealing platform part 23 is connected between the bottom surface of the expansion platform part 22 and the top surface of the support platform part 24, the sealing platform part 23 is also in a shape of a round platform with a large upper part and a small lower part, the support platform part 24 is in a cylindrical structure with an equal diameter (outer wall) from top to bottom, the inner wall of the support platform part 24 is sequentially formed by a large straight cylinder part, a pull-back platform part 25, a small straight cylinder part and a bottom horn part, the diameter of the large straight cylinder part is larger than that of the small straight cylinder part, the pull-back platform part 25 is a connecting part between the large straight cylinder part and the small straight cylinder part, and the vertical section of the pull platform part 25 is in a shape of a reverse splayed shape from top to bottom.

The rubber plug 3 is sleeved on the outer wall of the rubber plug support 2, in order to enable the rubber plug 3 to be matched with the rubber plug support 2, an assembly inclined plane 31 matched with the peripheral conical surface of the expansion table portion 22 is formed on the inner wall of the top of the hollow rubber plug 3, and the outer wall of the part of the rubber plug 3 corresponding to the assembly inclined plane 31 protrudes out of the outer wall of the rest part of the rubber plug 3, so that a rubber plug protrusion 33 is formed. The inner wall of the rubber plug 3 positioned below the assembly inclined plane 31 is a straight cylinder wall 34 matched with the outer wall of the support round platform part 24 of the rubber plug support 2, a triangular bulge rib 32 and a horizontal table surface are sequentially arranged between the bottom of the assembly inclined plane 31 and the top of the straight cylinder wall 34, the bottom surface of the triangular bulge rib 32 and the horizontal table surface are positioned on the same horizontal plane, the height of the top point of the triangular bulge rib 32 is higher than the height of the bottom of the assembly inclined plane 31, and after the rubber plug 3 and the rubber plug support 2 are assembled, the bottom surface of the expansion table part 22 of the rubber plug support 2 is pressed on the triangular bulge rib 32; a buffer ring 35 is formed at the bottom of the rubber plug 3, and the buffer ring 35 is a downward protruding part at the bottom of the rubber plug 3.

A space for the rubber plug support 2 to slide upwards is reserved in the core rod 4 and above the assembling surface of the rubber plug support 2. The head of the core bar 4 is a clamping table part 41, the clamping table part 41 is assembled on a pull-back table part 25 in the inner cavity of the support round table part 24, and the periphery of the clamping table part 41 is attached to a large straight cylinder part of the support round table part 24; and after the core rod 4 and the rubber plug support 2 are assembled, a gap exists between the top surface of the clamping table part 41 and the top of the inner cavity of the support round table part 24. A pushing table part 42 is designed on the core bar 4 and positioned at the lower part of the clamping table part 41, and the outer diameter of the pushing table part 42 is larger than the outer diameter of the rubber plug part corresponding to the straight cylinder wall 34. After the core rod 4, the rubber plug support 2 and the rubber plug 3 are assembled, the pushing table part 42 of the core rod 4 is attached to the bottom of the buffer ring 35 of the rubber plug 3, and a gap is reserved between the top surface of the pushing table part 42 of the core rod 4 and the bottom surface of the rubber plug support 2.

When the liquid is pumped, the core rod 4 is pulled back, friction displacement is generated between the support round platform part 24 of the rubber plug support 2 and the rubber plug 3, and the expansion table part 22 of the rubber plug support 2 pushes the assembly inclined surface 31 of the rubber plug 3, so that the rubber plug 3 is outwards deformed in a protruding mode, the tightness between the rubber plug 3 and the cylinder body 1 is improved, negative pressure is generated in the inner cavity of the cylinder body 1, and the liquid enters. When liquid is injected, the core rod 4 is pushed, the core rod 4 pushes the buffer ring 35 part of the rubber plug 3, friction displacement is generated between the rubber plug 3 and the rubber plug support 2, the rubber plug bulge 33 of the rubber plug 3 is extruded by the expansion table part 22 of the rubber plug support 2 to generate outward deformation, so that the tightness between the rubber plug 3 and the cylinder body 1 is improved, when the rubber plug support 2 and the rubber plug 3 are displaced to a liquid outlet at the end part of the cylinder body 1, injection is completed, at the moment, the lock table part 21 of the rubber plug support 2 penetrates through the lock teeth 11 of the cylinder body 1, the lock hooks and the lock teeth of the lock table part 21 are mutually locked, and when the core rod is pulled again, the rubber plug support 2 is separated from the core rod 4 to realize self-destruction.

Claims (4)

1. The disposable low-resistance self-destruction injector comprises a cylinder body, a rubber plug support, a rubber plug and a core rod, and is characterized in that the rubber plug is sleeved outside the rubber plug support, the core rod is assembled in the rubber plug support, and a space for the rubber plug support to slide upwards is reserved in the core rod and above the assembling surface of the rubber plug support; after the core rod, the rubber plug support and the rubber plug are assembled, the corresponding part of the core rod is attached to the bottom of the rubber plug, and a gap is reserved between the top surface of the pushing table part of the core rod and the bottom surface of the rubber plug support.

2. The disposable low-resistance self-destruction injector according to claim 1, wherein the rubber plug support comprises an expansion table part, a sealing table part and a support round table part, wherein the support round table part is of a cylindrical structure, the expansion table part is formed at the top of the support round table part, the expansion table part is of a round table shape with large upper part and small lower part, the minimum diameter of the expansion table part is larger than the outer diameter of the support round table part, the sealing table part is formed between the expansion table part and the support round table part, and an inverted eight-shaped pull-back table part is formed at a position corresponding to the inner wall of the support round table part; the rubber plug is of a hollow structure, an assembly inclined plane matched with the expansion table part of the rubber plug support is formed on the inner wall of the top of the rubber plug, an outward bulge is formed at the rubber plug part corresponding to the assembly inclined plane, the outer wall of the bulge is attached to the inner wall of the cylinder, an inner hole matched with the outer wall of the round table part of the support of the rubber plug support is formed below the assembly inclined plane, and a buffer ring is formed at the bottom of the rubber plug; the head end of the core rod is a clamping table part which is assembled on a pull-back table part in the inner cavity of the round table part of the rubber plug support, and a pushing table part is designed on the core rod and positioned at the lower part of the clamping table part; after the core rod, the rubber plug support and the rubber plug are assembled, the pushing table part of the core rod is attached to the bottom of the buffer ring of the rubber plug, and a gap is reserved between the top surface of the pushing table part of the core rod and the bottom surface of the rubber plug support.

3. The disposable low-resistance self-destroying injector according to claim 2, wherein a triangular bulge rib is formed between the assembling inclined plane of the rubber plug and the wall of the inner hole, and the bottom surface of the expansion table part of the rubber plug support is pressed on the triangular bulge rib after the rubber plug is assembled with the rubber plug support.

4. A single use low resistance self-destructing syringe according to claim 1 or 2 or 3 and in which a lock base is formed at the top centre of the expansion base, the lock base having a lock hook on its exterior Zhou Chengxing; correspondingly, locking teeth which are mutually locked with the locking hooks are formed on the inner wall of the liquid outlet of the cylinder body.