A disposable self-locking syringe

Abstract

This utility model belongs to the field of medical device technology, and in particular to a disposable self-locking syringe, including a syringe barrel and a needle mounted on the surface of the syringe barrel. A rubber head is slidably connected to the inner surface of the syringe barrel, and a push rod is fixedly connected to the surface of the rubber head. A pressing plate is fixedly connected to the end of the push rod away from the rubber head. The syringe barrel also includes a connecting plate fixedly connected to one end, and a gripping part is fixedly connected to the surface of the connecting plate. Both the connecting plate and the gripping part are slidably connected to the rubber head. This device can not only lock the push rod in one direction, but also does not hinder the extraction of liquid medicine after the push rod is installed, making it convenient for medical personnel to use. When the push rod is pushed all the way down, it is locked so that it cannot be reused after use, thus fundamentally eliminating the need for reuse.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a disposable self-locking syringe. Background Technology

[0002] Currently, there is a risk that ordinary disposable syringes are being reused. Some users are not hygienic and use one syringe for multiple purposes. Some criminals also collect and reuse used syringes for profit, repackaging and reselling them. Obviously, the hygiene conditions of such syringes do not meet the requirements for use, which will inevitably threaten the life safety of patients.

[0003] A search revealed that CN202699791U discloses a self-locking syringe, which includes "a syringe barrel, a needle installed at the front end of the syringe barrel, a plunger inside the syringe barrel, a piston installed at the front end of the plunger, anti-tipping teeth distributed on the plunger, and the anti-tipping teeth and the plunger being an integral structure, etc., which has the technical effect that the plunger is locked after use and cannot be used again."

[0004] In this existing design, the anti-reverse tough teeth can only pass forward through the tough perforation and cannot retract backward. However, when using the existing device, after the push rod is installed inside the syringe, the position of the anti-reverse tough teeth makes it inconvenient to draw out the liquid medicine, which affects the use by medical staff.

[0005] Therefore, a disposable self-locking syringe was designed to solve the above problems. Utility Model Content

[0006] To address the problems mentioned in the background section, this invention provides a disposable self-locking syringe. This device not only provides one-way locking of the plunger, but also does not hinder the extraction of medication after the plunger is installed, making it convenient for medical personnel to use. When the plunger is pushed all the way down, it is locked so that it cannot be reused after use, fundamentally eliminating the need for reuse.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a disposable self-locking syringe, comprising a syringe barrel and a needle mounted on the surface of the syringe barrel, a rubber head slidably connected to the inner surface of the syringe barrel, a push rod fixedly connected to the surface of the rubber head, a pressing plate fixedly connected to the end of the push rod away from the rubber head, and a connecting plate fixedly connected to one end of the syringe barrel, a gripping part fixedly connected to the surface of the connecting plate, both the connecting plate and the gripping part being slidably connected to the rubber head, slide rods symmetrically slidably connected to the inner surface of the connecting plate, a movable block fixedly connected to one end of each slide rod, the movable block being slidably connected to the inner surface of the connecting plate, a locking block fixedly connected to the surface of the push rod, and both the rubber head and the locking block being slidably connected to the movable block.

[0008] As a preferred embodiment of the disposable self-locking syringe of this utility model, both the rubber head and the locking block are in the shape of an inverted cone.

[0009] In a preferred embodiment of the disposable self-locking syringe of this utility model, the inner surface of the connecting plate is symmetrically provided with slots, and each slot is provided with a limit spring, which is sleeved on the surface of the slide rod.

[0010] In a preferred embodiment of the disposable self-locking syringe of this utility model, a limiting block is fixedly connected to the end of the slide bar away from the movable block, and the limiting block is slidably connected to the inner surface of the connecting plate.

[0011] As a preferred embodiment of the disposable self-locking syringe of this utility model, the grip part is wavy, and elastic pads are symmetrically fixedly connected to the surface of the grip part.

[0012] As a preferred embodiment of the disposable self-locking syringe of this utility model, the surface of the pressing plate is provided with a groove.

[0013] As a preferred embodiment of the disposable self-locking syringe of this utility model, the surface of the syringe is engraved with scale lines.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The staff pushes the push rod, which moves the locking block. When the locking block slides on the surface of the movable block, the movable block and the sliding rod slide inside the connecting plate. Through the slot inside the connecting plate, the limiting spring is compressed. When the locking block slides past the movable block, the limiting spring releases its elastic potential energy, causing the movable block to return to its original position. The movable block will then lock the locking block, preventing the push rod from being pulled out, thus allowing the syringe to be reused. Because both the rubber head and the locking block are inverted conical in shape, this design allows the rubber head to pass through the movable block first after the push rod, pre-limiting the push rod. The distance between the rubber head and the locking block allows medical staff to draw the medication. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the gripping part in this utility model;

[0019] Figure 3 This is a schematic diagram of the connecting plate in this utility model;

[0020] Figure 4 This is a schematic diagram of the pressing plate in this utility model;

[0021] In the picture:

[0022] 1. Syringe; 2. Needle; 3. Push rod; 4. Press plate; 5. Rubber head; 6. Connecting plate; 7. Grip part; 8. Movable block; 9. Locking block; 10. Hollow groove; 11. Limiting spring; 12. Limiting block; 13. Elastic washer; 14. Groove; 15. Scale line; 16. Slide rod. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] like Figure 1 As shown;

[0026] A disposable self-locking syringe includes a syringe barrel 1 and a needle 2 mounted on the surface of the syringe barrel 1. A rubber head 5 is slidably connected to the inner surface of the syringe barrel 1. A push rod 3 is fixedly connected to the surface of the rubber head 5. A pressing plate 4 is fixedly connected to the end of the push rod 3 away from the rubber head 5.

[0027] In this implementation plan: When the existing device is used to inject a patient, the plunger moves forward, and the anti-reverse flexible tooth also moves forward after passing through the flexible perforation. However, because the diameter of the convex shape formed by the tooth tip connection of the anti-reverse flexible tooth is larger than the diameter of the flexible perforation, the anti-reverse flexible tooth can only pass forward through the flexible perforation and cannot retract backward. Therefore, after the present invention is used, the plunger is locked and cannot be used again. For the specific working process, please refer to "CN202699791U discloses a self-locking syringe". However, because the existing device makes it inconvenient to draw the liquid medicine after the plunger is installed inside the syringe due to the position of the anti-reverse flexible tooth, it affects the use by medical staff. Therefore, a disposable self-locking syringe is designed to solve the above problems.

[0028] Furthermore:

[0029] like Figures 1 to 4 As shown:

[0030] Based on the above: a connecting plate 6 is fixedly connected to one end of the syringe 1, a gripping part 7 is fixedly connected to the surface of the connecting plate 6, the connecting plate 6 and the gripping part 7 are both slidably connected to the rubber head 5, a sliding rod 16 is symmetrically slidably connected to the inner surface of the connecting plate 6, a movable block 8 is fixedly connected to one end of each sliding rod 16, the movable block 8 is slidably connected to the inner surface of the connecting plate 6, a locking block 9 is fixedly connected to the surface of the push rod 3, the rubber head 5 and the locking block 9 are both slidably connected to the movable block 8.

[0031] In this implementation plan: the staff pushes the push rod 3, the push rod 3 drives the locking block 9 to move, when the locking block 9 slides past the movable block 8, the movable block 8 will lock the locking block 9 to prevent the push rod 3 from being pulled out, and thus the syringe 1 can be reused.

[0032] Furthermore:

[0033] like Figures 1 to 3 As shown:

[0034] In an optional embodiment, both the rubber head 5 and the locking block 9 are in the shape of an inverted cone.

[0035] In this embodiment: Since both the rubber head 5 and the locking block 9 are inverted cone shapes, with this design, the rubber head 5 passes through the push rod 3 and first passes through the movable block 8, which limits the push rod 3 in advance. The distance between the rubber head 5 and the locking block 9 allows medical staff to draw the medicine.

[0036] Furthermore:

[0037] like Figure 3 As shown:

[0038] In an optional embodiment, the inner surface of the connecting plate 6 is symmetrically provided with slots 10, and each slot 10 is provided with a limit spring 11, which is sleeved on the surface of the slide rod 16.

[0039] In this embodiment: when the locking block 9 slides on the surface of the movable block 8, the movable block 8 and the slide rod 16 slide inside the connecting plate 6, and squeeze the limiting spring 11 through the slot 10 inside the connecting plate 6. When the locking block 9 slides past the movable block 8, the limiting spring 11 releases its elastic potential energy, causing the movable block 8 to reset, and locking the push rod 3 through the locking block 9.

[0040] Furthermore:

[0041] like Figures 1 to 4 As shown:

[0042] In an optional embodiment, the end of the slide bar 16 away from the movable block 8 is fixedly connected to a limiting block 12, and the limiting block 12 is slidably connected to the inner surface of the connecting plate 6.

[0043] In this embodiment, since the end of the slide rod 16 away from the movable block 8 is fixedly connected to the limit block 12, this design is used to limit the slide rod 16.

[0044] Furthermore:

[0045] like Figures 1 to 4 As shown:

[0046] In an optional embodiment, the grip portion 7 is wavy, and elastic pads 13 are symmetrically fixedly connected to the surface of the grip portion 7.

[0047] In this implementation scheme: because the gripping part 7 is wavy, and elastic pads 13 are symmetrically fixedly connected to the surface of the gripping part 7, this design makes it convenient for medical staff to grip and use.

[0048] Furthermore:

[0049] like Figures 1 to 4 As shown:

[0050] In an optional embodiment, the surface of the pressing plate 4 is provided with a groove 14.

[0051] In this embodiment: because the surface of the pressing plate 4 has a groove 14, this design makes it convenient for the staff to press the pressing plate 4.

[0052] It should be noted that groove 14 is adapted to the curvature of people's thumbs.

[0053] Furthermore:

[0054] like Figure 1 As shown:

[0055] In an optional embodiment, the surface of the syringe 1 is engraved with scale lines 15.

[0056] In this embodiment: Because the surface of the syringe 1 is engraved with scale lines 15, this design makes it convenient for staff to observe the liquid medicine inside the syringe 1.

[0057] Working principle: The operator pushes the push rod 3, which moves the locking block 9. When the locking block 9 slides past the movable block 8, the movable block 8 will lock the locking block 9, thus preventing the push rod 3 from being pulled out, allowing the syringe 1 to be reused. Because both the rubber head 5 and the locking block 9 are inverted conical shapes, this design allows the rubber head 5 to pass through the movable block 8 after the push rod 3, pre-limiting the push rod 3. The distance between the rubber head 5 and the locking block 9 allows medical staff to draw the medication. When the locking block 9 slides on the surface of the movable block 8, the movable block 8 and the sliding rod 16 slide inside the connecting plate 6, squeezing the limiting spring 11 through the slot 10 inside the connecting plate 6. When the locking block 9 slides on the surface of the movable block 8, the movable block 8 and the sliding rod 16 slide inside the connecting plate 6. When the slide rod 9 slides past the movable block 8, the limiting spring 11 releases its elastic potential energy, causing the movable block 8 to reset. The locking block 9 then locks the push rod 3. Since the end of the slide rod 16 away from the movable block 8 is fixedly connected to the limiting block 12, this design limits the slide rod 16. Since the grip part 7 is wavy, and elastic pads 13 are symmetrically fixedly connected to the surface of the grip part 7, this design makes it convenient for medical staff to grip and use. Since the surface of the pressing plate 4 has a groove 14, this design makes it convenient for staff to press the pressing plate 4. Since the surface of the syringe 1 is engraved with scale lines 15, this design makes it convenient for staff to observe the liquid in the syringe 1.

[0058] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A disposable self-locking syringe, comprising a syringe barrel (1) and a needle (2) mounted on the surface of the syringe barrel (1), wherein a rubber head (5) is slidably connected to the inner surface of the syringe barrel (1), a push rod (3) is fixedly connected to the surface of the rubber head (5), and a pressing plate (4) is fixedly connected to one end of the push rod (3) away from the rubber head (5), characterized in that: It also includes a connecting plate (6) fixedly connected to one end of the syringe (1), a gripping part (7) fixedly connected to the surface of the connecting plate (6), the connecting plate (6) and the gripping part (7) are both slidably connected to the rubber head (5), a sliding rod (16) is symmetrically slidably connected to the inner surface of the connecting plate (6), a movable block (8) is fixedly connected to one end of the sliding rod (16), the movable block (8) is slidably connected to the inner surface of the connecting plate (6), a locking block (9) is fixedly connected to the surface of the push rod (3), the rubber head (5) and the locking block (9) are both slidably connected to the movable block (8).

2. The disposable self-locking syringe according to claim 1, characterized in that: Both the rubber head (5) and the locking block (9) are in the shape of an inverted cone.

3. The disposable self-locking syringe according to claim 2, characterized in that: The inner surface of the connecting plate (6) is symmetrically provided with slots (10), and each slot (10) is provided with a limit spring (11), which is sleeved on the surface of the slide rod (16).

4. The disposable self-locking syringe according to claim 3, characterized in that: The end of the slide bar (16) away from the movable block (8) is fixedly connected to a limiting block (12), and the limiting block (12) is slidably connected to the inner surface of the connecting plate (6).

5. The disposable self-locking syringe according to claim 4, characterized in that: The gripping part (7) is wavy, and elastic pads (13) are symmetrically fixedly connected to the surface of the gripping part (7).

6. The disposable self-locking syringe according to claim 5, characterized in that: The surface of the pressing plate (4) is provided with a groove (14).

7. The disposable self-locking syringe according to claim 6, characterized in that: The surface of the syringe (1) is engraved with scale lines (15).

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