Injector capable of preventing secondary use

Abstract

The utility model relates to the technical field of injectors, in particular to an injector capable of preventing secondary use, which comprises a needle cylinder, a needle head, a feeding assembly and a protection assembly, one end of the needle cylinder is provided with an insertion tube, the needle head is connected with the insertion tube in an inserted mode, the other end of the needle cylinder is provided with the feeding assembly, the feeding assembly comprises a piston, a push rod, a push plate and fins, and the fins are connected with the needle head in an inserted mode. According to the injector capable of preventing secondary use, the protection groove of the end cap accommodates the needle head, the clamping block is clamped into the clamping groove under the action of the elastic piece (the spring and the telescopic rod are combined, buffered and stabilized), the end cap and the needle cylinder are firmly locked, the injector can be taken down only when the structure is damaged, and secondary use of the injector is effectively prevented. And the inner side plate of the end cap is attached to the needle head, so that the needle head is prevented from shaking, and people are prevented from being punctured during collection.

Description

Technical Field

[0001] This utility model relates to the field of syringe technology, specifically to a syringe designed to prevent reuse. Background Technology

[0002] A syringe is a common medical device, mainly used for the precise extraction and delivery of various liquids;

[0003] Existing syringes, after injection, can still pump liquid while maintaining their structural integrity. This makes it easy for the equipment to be reused, potentially leading to safety accidents. Furthermore, the exposed needles pose a risk of accidentally injuring medical waste collection and disposal personnel, making them inconvenient to use. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a syringe that prevents reuse.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a syringe for preventing reuse, comprising a syringe barrel, a needle, a feeding assembly, and a protective assembly. One end of the syringe barrel is provided with a cannula, and the needle is inserted into the cannula. The other end of the syringe barrel is provided with the feeding assembly, which includes a piston, a push rod, a push plate, and fins. The fins are symmetrically arranged on both sides of the other end of the syringe barrel. A piston is slidably arranged on the other end of the syringe barrel. The two ends of the push rod are respectively connected to the piston and the push plate. The protective assembly includes an end cap, a connecting frame, an elastic element, and a locking block. A protective groove adapted to the needle is provided below the end cap. Protrusions are symmetrically arranged on both sides of the syringe barrel near the needle. A movable groove is provided at the end of the protrusions away from the syringe barrel. The two ends of the elastic element are respectively connected to the inner wall of the movable groove and the locking block. A connecting frame covering the protrusions is also provided on the end cap, and a locking groove adapted to the locking block is provided inside the connecting frame.

[0008] To facilitate stable movement of the locking block, this utility model is improved by including a spring and a telescopic rod as the elastic element. The spring is sleeved on the telescopic rod, and both ends of the spring and the telescopic rod are respectively connected to the inner wall of the movable groove and one end of the locking block.

[0009] To facilitate stable assembly of the end cap and the locking block, this utility model is improved by providing an inclined surface at the end of the locking block near the needle tip.

[0010] Preferably, the outer wall of the syringe is further provided with scale lines, which are located around the protrusion.

[0011] Preferably, the end cap is further provided with several sets of side plates that fit against the end of the needle.

[0012] (III) Beneficial Effects

[0013] Compared with the prior art, this utility model provides a syringe that prevents reuse, and has the following beneficial effects:

[0014] This syringe, designed to prevent reuse, features a protective groove on the end cap to hold the needle. A locking block, secured by an elastic element (a combination of spring and telescopic rod for cushioning and stability), engages with the groove, firmly locking the end cap to the syringe barrel. Removal requires structural damage, effectively preventing the syringe from being reused. The beveled surface of the locking block facilitates initial installation, while the inner plate of the end cap conforms to the needle, preventing it from shifting and also preventing needle pricks during collection. Attached Figure Description

[0015] Figure 1 This is an exploded view of the structure of this utility model;

[0016] Figure 2 This is a partial explosion diagram of the structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the main structure of this utility model;

[0018] Figure 4 This is a partial schematic diagram of the structure of this utility model.

[0019] In the diagram: 1. Syringe; 2. Needle; 3. Cannula; 4. Piston; 5. Push rod; 6. Push plate; 7. Fin; 8. End cap; 9. Connecting frame; 10. Locking block; 11. Protrusion; 12. Spring; 13. Telescopic rod; 14. Inclined surface; 15. Scale line; 16. Side plate. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4A syringe designed to prevent reuse includes a syringe barrel 1, a needle 2, a feeding assembly, and a protective assembly. One end of the syringe barrel 1 has a cannula 3, to which the needle 2 is inserted. The other end of the syringe barrel 1 has the feeding assembly, which includes a piston 4, a push rod 5, a push plate 6, and fins 7. The fins 7 are symmetrically arranged on both sides of the other end of the syringe barrel 1. The piston 4 is slidably mounted on the other end of the syringe barrel 1. The two ends of the push rod 5 are connected to the piston 4 and the push plate 6, respectively. The protective assembly includes an end cap 8, a connecting frame 9, an elastic element, and a locking block 10. The end cap 8 has a protective groove below it that is adapted to the needle 2. The syringe 1 has symmetrical protrusions 11 on both sides near the end of the needle 2. The protrusions 11 have a movable groove at the end away from the syringe 1. The elastic element is connected to the inner wall of the movable groove and the locking block 10 at both ends, respectively. The end cap 8 also has a connecting frame 9 that covers the protrusions 11. The connecting frame 9 has a locking groove adapted to the locking block 10.

[0022] The piston 4 fits snugly inside the syringe 1 and can slide smoothly along the inner wall of the syringe 1. When liquid needs to be drawn, the user holds the push plate 6 and the fins 7 on both sides of the syringe 1 and pulls the push rod 5 outward. The push rod 5 moves the piston 4 away from the needle 2. At this time, the internal space of the syringe 1 increases, the pressure decreases, and a negative pressure environment is formed. Under the action of atmospheric pressure, the external liquid enters the syringe 1 through the cannula 3. When liquid needs to be injected, the push rod 5 is pushed in the opposite direction, and the piston 4 moves towards the needle 2, compressing the internal space of the syringe 1, increasing the pressure, and the liquid is squeezed out from the needle 2. By observing the scale lines 15 around the protrusions 11 on the outer wall of the syringe 1, medical staff can accurately control the amount of liquid drawn.

[0023] After the injection is completed, when installing the end cap 8, the inclined surface 14 of the locking block 10 near the needle 2 takes effect. As the end cap 8 is slipped onto the syringe 1 near the needle 2, the connecting frame 9 gradually covers the protrusion 11, and the inclined surface 14 contacts the protrusion 11. As the end cap 8 continues to press down, the protrusion 11 presses against the locking block 10, causing the locking block 10 to compress the spring 12 and retract into the movable groove. The telescopic rod 13 ensures linear movement. Until the groove in the connecting frame 9 aligns with the locking block 10, the spring 12 rebounds, pushing the locking block 10 into the groove, achieving a secure connection between the end cap 8 and the syringe 1. At this point, the protective groove below the end cap 8 neatly accommodates the needle 2.

[0024] In this embodiment, the end cap 8 is also provided with several sets of side plates 16 that fit against the end of the needle 2. After injection, because the locking block 10 is firmly locked in the slot, the end cap 8 cannot be easily removed without external force to break the elastic element or the slot structure. This prevents the syringe from drawing liquid again even if the piston 4, push rod 5, and other feeding components are intact, effectively eliminating reuse. At the same time, the several sets of side plates 16 inside the end cap 8 fit against the end of the needle 2, firmly fixing the needle 2 and preventing it from shaking in the protective groove. This prevents medical waste collection and disposal personnel from being accidentally injured by the exposed and shaking needle 2, ensuring safety throughout the entire use cycle.

[0025] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0026] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A syringe designed to prevent reuse, comprising a syringe barrel (1), a needle (2), a feeding assembly, and a protective assembly, characterized in that: One end of the syringe (1) is provided with a cannula (3), and the needle (2) is inserted into the cannula (3). The other end of the syringe (1) is provided with the feeding assembly, which includes a piston (4), a push rod (5), a push plate (6), and fins (7). The fins (7) are symmetrically arranged on both sides of the other end of the syringe (1). The piston (4) is slidably arranged on the other end of the syringe (1). The two ends of the push rod (5) are respectively connected to the piston (4) and the push plate (6). The protective assembly includes an end cap (8) and a connecting frame (9). The end cap (8) is provided with a protective groove that is compatible with the needle (2) and the syringe (1) is provided with symmetrical protrusions (11) on both sides of the end near the needle (2). The end of the protrusion (11) away from the syringe (1) is provided with a movable groove. The two ends of the elastic element are connected to the inner wall of the movable groove and the locking block (10) respectively. The end cap (8) is also provided with a connecting frame (9) that covers the protrusion (11). The connecting frame (9) is provided with a locking groove that is compatible with the locking block (10).

2. The syringe for preventing reuse according to claim 1, characterized in that: The elastic element includes a spring (12) and a telescopic rod (13). The spring (12) is sleeved on the telescopic rod (13). Both ends of the spring (12) and the telescopic rod (13) are respectively connected to the inner wall of the movable groove and one end of the locking block (10).

3. A syringe for preventing reuse according to claim 2, characterized in that: The card block (10) is also provided with a bevel (14) at the end near the needle (2).

4. A syringe for preventing reuse according to claim 3, characterized in that: The outer wall of the syringe (1) is also provided with scale lines (15), which are located around the protrusion (11).

5. A syringe for preventing reuse according to claim 4, characterized in that: The end cap (8) is also provided with several sets of side plates (16) that fit into the end of the needle (2).

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