A resilient connector for secure mounting and a syringe

Abstract

This invention provides an elastic connector and syringe that facilitates stable installation. It includes a locking portion for engaging the end of the piston rod housing and an elastic abutment portion for abutting the top end face of the syringe barrel. At least one layer of abutment portions is fixed to the bottom of the locking portion. When installing the syringe barrel, the top end face of the syringe barrel overcomes the elastic force to compress the abutment portion axially, thereby limiting the syringe barrel's radial and / or axial sway. When disassembling the syringe barrel, the compressed abutment portion returns to its original position under the elastic force, and both the locking portion and the abutment portion remain on the end of the piston rod housing. This invention has a compact structure, preventing the connector from falling off or being lost during syringe barrel assembly and disassembly, effectively improving assembly and disassembly efficiency, and preventing the syringe barrel from swaying axially and / or radially during use.

Description

Technical Field

[0001] This utility model relates to the field of syringe technology, and in particular to an elastic connector and syringe that are easy to install securely. Background Technology

[0002] Currently, most disposable syringes, auto-injectors, or safety syringes incorporate a separate spring component to accommodate deviations in the axial dimensions of the syringe barrel, particularly to reduce vibration during assembly and use. The spring is fixed to the end of the piston rod housing, utilizing its elastic deformation to axially fix the syringe barrel and reduce movement within the needle tip cavity. To accommodate spring installation, a groove for spring engagement is required in the spring retainer, and a flat ring is also fabricated around the spring end to engage with this groove. This process is relatively complex, requiring specific alignment steps during installation to prevent misalignment, resulting in low installation efficiency. In existing technologies, such as... Figure 1 As shown, a movable spring is used to engage with the syringe barrel. When the syringe barrel is disassembled, the movable spring is prone to rolling off and being lost, causing inconvenience for repeated disassembly and replacement of the syringe barrel. If the spring is omitted from the syringe, the syringe barrel is prone to radial or axial wobbling, which can lead to abnormal noise.

[0003] In addition, some syringes in the existing technology are directly installed using elastic collars. However, when using elastic collars, the elastic collar is prone to falling off and being lost during the disassembly of the syringe, and is not easy to find. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide an elastic connector that is easy to install securely, so as to avoid shaking after the syringe is installed, and at the same time prevent the connector from falling off and being lost when the syringe is disassembled.

[0005] This utility model provides an elastic connector that is easy to install securely, including a snap-fit ​​part for snapping the end of the piston rod housing and an elastic abutment part for abutting the top end face of the syringe, wherein at least one abutment part is fixedly provided at the bottom of the snap-fit ​​part.

[0006] When installing the syringe, the top end face of the syringe overcomes the elastic force and compresses the abutment part axially, thereby limiting the syringe's radial and / or axial swaying.

[0007] When the syringe is disassembled, the compressed abutment is reset under the action of elastic force, and the locking part and the abutment part remain on the end of the piston rod housing.

[0008] Preferably, the abutting portion includes an annular structure, the annular structure being arranged in an undulating manner along the axial direction, and the annular structure portion abuts against the top end face of the injection cylinder to provide elasticity.

[0009] Preferably, the annular structure has at least two contact surfaces that abut against the top end face of the syringe.

[0010] Preferably, the abutting portion further includes a first connecting portion and a second connecting portion for fixing the snap-fit ​​portion, the first connecting portion and the second connecting portion being symmetrically fixed on the annular structure, and the annular structure regions corresponding to the first connecting portion and the second connecting portion not contacting the top end face of the syringe.

[0011] Preferably, the non-connecting area between the snap-fit ​​portion and the abutment portion is hollowed out.

[0012] Preferably, the top end face of the syringe is provided with a first groove corresponding to the abutment surface, the annular structure is engaged with the contact area of ​​the top end face of the syringe in the first groove, and there is a gap between the abutment surface and the bottom surface of the first groove.

[0013] Preferably, the annular structure and the first slot are fitted with a clearance.

[0014] Preferably, the snap-fit ​​portion is provided with a through hole along the axial direction for the piston rod housing end to pass through. The shape of the through hole matches the piston rod sleeve end. At least one pair of symmetrically arranged snap-fit ​​members are provided in the through hole for snapping into the second snap-fit ​​groove of the piston rod housing end.

[0015] Preferably, the snap-fit ​​component has a beveled surface for locking along the axial direction of the through hole.

[0016] The second aspect of this utility model provides a syringe, including the elastic connector as described above, one end of which is engaged with the end of the piston rod housing, and the other end of which abuts against or is engaged with the top end face of the syringe barrel.

[0017] As described above, the elastic connector of this utility model, which facilitates stable installation, has the following advantages compared with the prior art:

[0018] This invention fixes the snap-fit ​​part and the abutment part together, with the snap-fit ​​part snapping onto the end of the piston rod housing and the bottom of the abutment part abutting against the top end face of the syringe barrel. During syringe barrel assembly and disassembly, when installing the syringe barrel, the top end face of the syringe barrel needs to overcome the elasticity of the abutment part to compress it; when disassembling the syringe barrel, the compressed abutment part returns to its original position under the action of the elasticity, and the snap-fit ​​part and the abutment part remain on the end of the piston rod housing. This invention has a compact structure, which can prevent the connecting parts from falling off or being lost during syringe barrel assembly and disassembly, effectively improving assembly and disassembly efficiency and preventing the syringe barrel from shaking axially and / or radially during use. Attached Figure Description

[0019] Figure 1 Assembly drawings for existing technology.

[0020] Figure 2 A three-dimensional schematic diagram of the first posture of an elastic connector that is easy to install securely, according to an embodiment of the present invention.

[0021] Figure 3 A three-dimensional schematic diagram of the second posture of an elastic connector that facilitates stable installation, provided in an embodiment of the present invention.

[0022] Figure 4 This is a top view of the assembly of this utility model.

[0023] Figure 5 for Figure 3 BB is a cross-sectional view.

[0024] Figure 6 for Figure 3 AA is a cross-sectional view.

[0025] Figure 7 This is an assembly diagram of the elastic connector and the end of the piston rod housing after the syringe is disassembled.

[0026] Figure 8 for Figure 4 Local magnification Figure I .

[0027] Figure 9 for Figure 4 Local magnification Figure II .

[0028] Figure 10 for Figure 4 First state local magnification Figure III .

[0029] Figure 11 for Figure 5 Local magnification Figure IV .

[0030] Figure 12 for Figure 4 Second state local magnification Figure III .

[0031] Figure 13 This is a top view of the syringe in the second state.

[0032] Figure 14 This is a diagram showing the state of the piston rod being driven to abut against the piston inside the syringe.

[0033] Explanation of reference numerals in the attached figures:

[0034] 100, snap-fit ​​part; 110, through hole; 111, snap-fit ​​piece; 112, inclined surface; 200, abutment part; 210, annular structure; 211, abutment surface; 220, first connecting part; 230, second connecting part; 300, piston rod housing; 310, second slot; 400, syringe; 410, first slot; 500, piston rod. Detailed Implementation

[0035] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0036] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0037] like Figures 2 to 11 As shown, the first aspect of this utility model proposes an elastic connector that facilitates stable installation, including a snap-fit ​​portion 100 for snapping onto the end of a piston rod housing and an elastic abutment portion 200 for abutting against the top end face of a syringe barrel. The abutment portion 200 is made of an elastic and repositionable plastic material, such as polypropylene, elastic resin, or polyurethane. This material has a certain rigidity and can be compressed and repositioned. At least one layer of abutment portions 200 is provided at the bottom of the snap-fit ​​portion 100. In this embodiment, multiple layers of abutment portions can be provided, with adjacent abutment portions arranged alternately. The number of layers is not limited in this embodiment and can be determined by those skilled in the art based on the specific structure of the syringe. In this embodiment, the abutment portion 200 and the snap-fit ​​portion 100 can be integrally formed, both made of elastic material; alternatively, the abutment portion 200 and the snap-fit ​​portion 100 can be separately provided, and the two are fixedly connected. The snap-fit ​​portion 100 is made of elastic material, while the abutment portion 200 can be made of either rigid or elastic material; no limitation is made here.

[0038] When using, such as Figure 5 and Figure 6As shown, during the installation of the syringe, the syringe 400 needs to be placed in the first housing cavity that can accommodate the syringe. The first housing is detachably connected to the second housing, which houses the piston rod housing. During this connection, the top end face of the syringe elastically compresses the abutment portion 200 along the axial direction. Because the abutment portion 200 is subjected to upward pressure from the top end face of the syringe, conversely, the abutment portion 200 exerts a downward elastic force on the top end face of the syringe, thus preventing the syringe from shaking within the first housing. During disassembly, after disassembling the syringe, the pressure exerted on the abutment portion 200 by the top end face of the syringe is released. The compressed abutment portion 200 resets under its own elastic force, returning to its initial state. At this time, both the locking portion 100 and the abutment portion 200 remain on the end of the piston rod housing, preventing the abutment portion 200 from rolling off during reset and effectively improving the efficiency of syringe assembly and disassembly.

[0039] It should be noted that in this invention, the piston rod housing is a fixed connection part of the syringe housing, and the piston rod housing does not move with the axial movement of the piston rod.

[0040] In one embodiment, such as Figure 2 , Figure 3 and Figure 8 As shown, the snap-fit ​​portion 100 has a through hole 110 along the axial direction for the end of the piston rod housing 300 to pass through. The shape of the through hole 110 matches the end of the piston rod housing 300, and the shape is not limited here. At least one pair of symmetrically arranged snap-fit ​​members 111 are provided in the through hole 110. At least two symmetrically arranged second snap-fit ​​grooves 310 are opened in the end of the piston rod housing 300. The second snap-fit ​​grooves 310 are distributed on the side walls on both sides of the end of the piston rod housing 300. The number and position of the snap-fit ​​members 111 correspond one-to-one with the second snap-fit ​​grooves 310.

[0041] When using, such as Figure 7 As shown, the piston rod housing 300 end passes through the through hole 110 through the snap-fit ​​part 100, so that the snap-fit ​​part 111 is snapped into the second snap-fit ​​groove 310 to ensure that the syringe is not dislodged when it is disassembled.

[0042] Furthermore, such as Figure 8 and Figure 9 As shown, the snap-fit ​​component 111 has a bevel 112 for locking along the axial direction of the through hole. This bevel is a transition surface between the bottom surface of the snap-fit ​​part 100 and the inner wall of the through hole 110, so that the size of the through hole gradually decreases from top to bottom. The inclination of this bevel can be determined according to the specific working conditions. Among them, a transition surface perpendicular to the bottom surface is provided near the bottom surface of the snap-fit ​​part 100 (not shown in the figure).

[0043] During installation, the piston rod housing is moved upwards along the axial direction by fitting the transition surface against the outer wall of the piston rod housing end until the inclined surface and transition surface portion enter the second slot 310, causing the locking member 111 to engage in the second slot. To facilitate disassembly of the locking member 111, the locking member 111 is integrally formed with the locking part 100, and both are made of elastic material. A gap is provided between the bottom surface of the locking member 111 and the bottom surface of the second slot 310.

[0044] In one embodiment, such as Figure 2 and Figure 3 As shown, the abutment portion 200 includes an annular structure 210, which is arranged in an undulating manner along the axial direction. The annular structure portion abuts against the top end face of the syringe barrel so that when pressure is applied to the top end face of the syringe barrel, the annular structure is compressed, thereby providing elastic force to the top end face of the syringe barrel to ensure that the syringe barrel does not shake during use.

[0045] Specifically, in this embodiment, the undulating structure of the ring structure is preferably a wave-like structure. In this embodiment, it is preferably two peaks and two troughs. The two peaks are arranged opposite each other, and the two troughs are also arranged opposite each other. The positions of the two troughs are in contact with the top end face of the syringe, while the positions of the peaks are not in contact with the top end face of the syringe. Through this undulating structure, the whole structure is more likely to deform and generate elasticity after being subjected to force.

[0046] Furthermore, it is understood that the annular structure involved in this embodiment is not limited to two peaks and two troughs; multiple peaks and troughs can be distributed at intervals, ensuring that the annular structure has at least two contact surfaces 211 that abut against the top end face of the injection cylinder. If, after assembling the first and second housings, the distance between the piston rod housing end and the top end face of the injection cylinder is too large, a longer elastic connector is required. To meet this requirement, based on this embodiment, a multi-layered annular structure is added. The annular structures of adjacent layers are fixedly connected or integrally formed, and the peaks of each layer are connected to the troughs of the adjacent layers, achieving an alternating arrangement.

[0047] In one embodiment, such as Figure 2 and Figure 3 As shown, the abutment portion 200 also includes a first connecting portion 220 and a second connecting portion 230 for fixing the connecting snap-fit ​​portion 100. The first connecting portion 220 and the second connecting portion 230 are symmetrically fixed on the annular structure 210. The annular structure areas corresponding to the first connecting portion 220 and the second connecting portion 230 do not contact the top end face of the syringe. When the annular structure is subjected to force, it is easier for the annular structure to deform and generate elasticity.

[0048] In one embodiment, such as Figure 2 and Figure 3As shown, the non-connecting area between the snap-fit ​​portion 100 and the abutment portion 200 is hollowed out, which makes it easier for the abutment portion 200 to deform under force, providing sufficient elasticity to suppress the shaking of the syringe.

[0049] In one embodiment, such as Figure 12 and Figure 13 As shown, this embodiment requires an improvement to the top end face of the syringe. Specifically, the top end face of the syringe is provided with a first groove 410 corresponding to the abutment surface 211. The annular structure 210 engages with the contact area of ​​the top end face of the syringe within the first groove 410. When installing the syringe, pressure is applied to the top end face of the syringe to the annular structure 210, causing the annular structure 210 to overcome its own elastic compression and achieve force balance, effectively limiting the axial movement of the syringe. Simultaneously, the first groove 410 effectively limits the radial movement of the syringe. It should be noted that the number of first grooves 410 can be determined based on the contact area between the annular structure and the top end face of the syringe.

[0050] Furthermore, the annular structure 210 and the first slot 410 are fitted with a clearance so that the annular structure can easily detach from the injection cartridge when it is disassembled.

[0051] A second aspect of this invention provides a syringe, including an elastic connector as described in any of the above embodiments. One end of the elastic connector is engaged with the end of the piston rod housing, and the other end of the elastic connector abuts against the top end face of the syringe barrel. When the syringe barrel needs to be disassembled, the elastic connector is kept engaged with the piston rod housing to prevent it from falling off and being lost. When the syringe barrel is installed, the elastic connector prevents the syringe barrel from shaking radially and / or axially within the first housing.

[0052] like Figure 14 As shown, an example of the operation of a syringe containing the elastic connector is as follows: when the syringe barrel (generally a cartridge bottle without a flange at the port, but not limited to this) is placed in place, the elastic connector abuts against the edge of the syringe barrel to prevent radial and circumferential wobbling of the syringe barrel. The piston rod 500 is driven to abut against the piston inside the syringe barrel (generally a cartridge bottle) and move toward the needle tip to perform injection.

[0053] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A flexible connector that facilitates stable installation, characterized in that, It includes a snap-fit ​​portion (100) for snapping onto the end of the piston rod housing and an elastic abutment portion (200) for abutting against the top end face of the syringe barrel, wherein at least one abutment portion (200) is fixedly provided at the bottom of the snap-fit ​​portion (100). When the syringe is installed, the top end face of the syringe overcomes the elastic force to compress the abutment part along the axial direction, thereby limiting the syringe (400) from shaking in the radial and / or axial directions; When the syringe is disassembled, the compressed abutment (200) is reset under the action of elastic force, and the snap-fit ​​(100) and the abutment (200) remain on the end of the piston rod housing.

2. The elastic connector for easy and stable installation according to claim 1, characterized in that, The contact portion (200) includes an annular structure (210), which is arranged in an undulating manner along the axial direction, and the annular structure portion abuts against the top end face of the injection cylinder to provide elasticity.

3. The elastic connector for easy and stable installation according to claim 2, characterized in that, The annular structure (210) has at least two contact surfaces (211) that abut against the top end face of the syringe.

4. The elastic connector for easy and stable installation according to claim 3, characterized in that, The abutment portion (200) further includes a first connecting portion (220) and a second connecting portion (230) for fixing the snap-fit ​​portion. The first connecting portion (220) and the second connecting portion (230) are symmetrically fixed on the annular structure (210). The annular structure regions corresponding to the first connecting portion (220) and the second connecting portion (230) do not contact the top end face of the syringe.

5. The elastic connector for easy and secure installation according to claim 1, characterized in that, The non-connecting area between the snap-fit ​​portion (100) and the abutment portion (200) is hollowed out.

6. The elastic connector for easy and secure installation according to claim 3, characterized in that, The top end face of the syringe is provided with a first groove (410) corresponding to the abutment surface (211), and the annular structure (210) is engaged with the contact area of ​​the top end face of the syringe in the first groove (410).

7. The elastic connector for easy and secure installation according to claim 6, characterized in that, The annular structure (210) and the first slot (410) are fitted with a clearance.

8. The resilient connector for easy and secure installation according to any one of claims 1 to 7, characterized in that, The snap-fit ​​part (100) is provided with a through hole (110) along the axial direction for the piston rod housing end to pass through. The shape of the through hole (110) matches the piston rod housing end. At least one pair of symmetrically arranged snap-fit ​​members (111) are provided in the through hole (110) for snapping into the second snap-fit ​​groove (310) of the piston rod housing end.

9. The elastic connector for easy and stable installation according to claim 8, characterized in that, The snap-fit ​​member (111) has a bevel (112) for locking along the axial direction of the through hole.

10. A syringe, characterized in that, Includes the elastic connector as described in any one of claims 1 to 9, wherein one end of the elastic connector is engaged with the end of the piston rod housing, and the other end of the elastic connector abuts against the top end face of the injection cylinder.

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