Syringe with anti-overflow function

Abstract

This utility model discloses a syringe with anti-overflow function, relating to the field of syringe technology. It includes a barrel, with a first piston slidably engaged on the inner wall of the barrel. A push rod is disposed on one side of the first piston. Four fins are evenly spaced on the outer wall of the push rod. A push plate is disposed at the end of the push rod away from the first piston. Each of the four fins, away from the push rod and close to the first piston, has a groove. A retaining ring is rotatably engaged at each of the four grooves. Two locking slots are symmetrically arranged on the outer side of the retaining ring. A connecting ring is sleeved on the outer wall of the barrel, and two end plates are symmetrically fixed on the side of the connecting ring facing the barrel. In this utility model, after drawing the medication, the retaining ring can be rotated to misalign the locking plate with the locking slots. The locking plate abuts against the retaining ring, restricting the movement of the push rod and preventing medication from overflowing from the needle tip when the syringe is tilted or subjected to external pressure, reducing medication waste, minimizing environmental pollution, and reducing harm to the user. Before injection, rotating the retaining ring aligns the locking slots with the locking plate without affecting normal injection operation.

Description

Technical Field

[0001] This utility model relates to the field of syringe technology, and in particular to a syringe with anti-overflow function. Background Technology

[0002] A syringe is a common medical device, mainly used to inject or extract liquids from the human body.

[0003] The prior art can be referenced in Chinese Patent Application No. 201920601911.8, which discloses a syringe with anti-overflow function, including: a syringe barrel, the inner cavity of which has an elliptical cross-section; a piston, the cross-section of which is elliptical and adapted to the inner cavity of the syringe barrel; and a push rod, which has a first rib and a second rib, the first rib and the second rib being symmetrically arranged, and the radial width of the first rib and the second rib being greater than the minor axis length of the syringe barrel cross-section and less than or equal to the major axis length of the syringe barrel. However, after the syringe draws out the liquid, if the syringe is tilted or squeezed by external force, the liquid may overflow from the needle tip, which not only wastes the liquid but may also pollute the environment and even cause harm to the user.

[0004] Therefore, a syringe with anti-overflow function is provided. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a syringe with an anti-overflow function. After drawing the medication, the retaining ring can be rotated to misalign the retaining plate with the retaining opening. The retaining plate abuts against the retaining ring to restrict the movement of the plunger, preventing the medication from overflowing from the needle tip when the syringe is tilted or squeezed by external force. This reduces medication waste, eliminates environmental pollution, and minimizes harm to the user. Before injection, rotating the retaining ring aligns the retaining opening with the retaining plate without affecting normal injection operations, thus overcoming the shortcomings of existing technologies.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A syringe with anti-overflow function includes a barrel. A first piston is slidably engaged with the inner wall of the barrel. A push rod is provided on one side of the first piston. Four fins are evenly spaced on the outer wall of the push rod. A push plate is provided at the end of the push rod away from the first piston. A groove is provided at the end of the four fins away from the push rod and close to the first piston. A retaining ring is rotatably engaged at the four grooves. Two retaining holes are symmetrically provided on the outer side of the retaining ring. A connecting ring is sleeved on the outer wall of the barrel. Two end plates are symmetrically fixed on the side of the connecting ring facing the barrel. A retaining plate perpendicular to the end plate is provided at the end of the two end plates away from the connecting ring.

[0007] As a further improvement of this utility model, the size of the card plate is smaller than the size of the card slot.

[0008] As a further improvement of this utility model, two ear plates are symmetrically arranged on the outer wall of the open end of the cylinder.

[0009] As a further improvement of this utility model: both ear plates are provided with arc-shaped channels on their edges, and both ear plates are provided with snap-fit ​​grooves that communicate with the arc-shaped channels. The connecting ring is symmetrically provided with T-shaped snap-fit ​​pins that engage with the snap-fit ​​grooves.

[0010] As a further improvement of this utility model, a first sealing ring is embedded in the outer wall of the first piston.

[0011] As a further embodiment of this utility model: a threaded hole is provided on the side of the first piston facing the sealing end of the cylinder, a connecting post is connected to the threaded hole, an external thread is provided on the outer wall of one end of the connecting post to form a threaded engagement with the threaded hole, and a second piston is provided on the end of the connecting post away from the first piston.

[0012] As a further improvement of this utility model: a second sealing ring is embedded in the outer wall of the second piston, and the connecting column and the second piston are integrally formed.

[0013] As a further improvement of this utility model: the closed end of the cylinder is provided with a liquid outlet, and a needle is fitted onto the liquid outlet.

[0014] The beneficial effects of this utility model are as follows: 1. After drawing the medication, the retaining ring can be rotated to misalign the retaining plate with the retaining slot. The retaining plate holds the retaining ring in place to restrict the movement of the push rod, preventing the medication from spilling from the needle tip when the syringe is tilted or squeezed by external force. This reduces medication waste, prevents environmental pollution, and minimizes harm to the user. Before injection, rotating the retaining ring will align the retaining slot with the retaining plate without affecting normal injection operations.

[0015] 2. The second piston is detachably connected to the first piston via a connecting column, which facilitates waste recycling; the second piston contacts the liquid to complete the injection, and the first piston further enhances the sealing effect, ensuring reliable sealing during the injection process. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the syringe with anti-overflow function proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the first partial structure of the syringe with anti-overflow function proposed in this utility model.

[0018] Figure 3 This is a schematic diagram of the second partial structure of the syringe with anti-overflow function proposed in this utility model.

[0019] Figure 4This is a schematic diagram of the retaining ring structure of the syringe with anti-overflow function proposed in this utility model.

[0020] Figure 5 The syringe with anti-overflow function proposed in this utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Cylinder; 2. Needle; 3. Snap ring; 4. Push rod; 5. Fin plate; 6. Push plate; 7. Ear plate; 8. End plate; 9. Snap plate; 10. First piston; 11. First sealing ring; 12. Threaded hole; 13. Connecting post; 14. External thread; 15. Second piston; 16. Second sealing ring; 17. Snap groove; 18. Snap opening; 19. Connecting ring; 20. Snap groove; 21. Arc-shaped channel; 22. T-shaped snap pin; 23. Dispensing nozzle. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Example 1, referring to Figure 1-5 A syringe with anti-overflow function includes a barrel 1. A first piston 10 is slidably engaged with the inner wall of the barrel 1. A first sealing ring 11 is embedded in the outer wall of the first piston 10. A push rod 4 is provided on one side of the first piston 10. Four fins 5 are equidistantly arranged on the outer wall of the push rod 4. A push plate 6 is provided at the end of the push rod 4 away from the first piston 10. A slot 17 is provided at the end of the four fins 5 away from the push rod 4 and close to the first piston 10. A retaining ring 3 is rotatably engaged at the four slots 17. Two retaining holes 18 are symmetrically arranged on the outer side of the retaining ring 3. A connecting ring 19 is sleeved on the outer wall of the barrel 1. Two end plates 8 are symmetrically fixed on the side of the connecting ring 19 facing the barrel 1. A retaining plate 9 perpendicular to the end plate 8 is provided at the end of the two end plates 8 away from the connecting ring 19. The size of the retaining plate 9 is smaller than the size of the retaining hole 18 to ensure that the retaining plate 9 can pass through the retaining hole 18.

[0024] Two ear plates 7 are symmetrically arranged on the outer wall of the open end of the cylinder 1. Each ear plate 7 has an arc-shaped channel 21 on its edge and a snap-fit ​​groove 20 that communicates with the arc-shaped channel 21. T-shaped snap-fit ​​pins 22 that engage with the snap-fit ​​groove 20 are symmetrically arranged on the connecting ring 19. By rotating the connecting ring 19, the two T-shaped snap-fit ​​pins 22 can be snapped into the snap-fit ​​groove 20 from the two arc-shaped channels 21 respectively, thus realizing the installation of the connecting ring 19.

[0025] The closed end of the cylinder 1 is provided with a liquid outlet 23, and a needle 2 is sleeved on the liquid outlet 23.

[0026] When the liquid medicine is drawn into the cylinder 1, the first piston 10 moves to the limit position, so that the two locking plates 9 pass through the two locking holes 18 of the two locking rings 3 respectively, and then rotate to the locking ring 3, so that the two locking plates 9 are misaligned with the two locking holes 18, thereby making the two locking plates 9 abut against the locking ring 3, preventing the push rod 4 from being squeezed by external force and causing the liquid medicine to overflow from the needle 2. Before injection, rotate the retaining ring 3 so that the two retaining slots 18 are aligned with the two retaining plates 9, and then the injection operation can be performed normally.

[0027] Example 2 is an optimization based on Example 1, specifically: The first piston 10 has a threaded hole 12 on the side facing the sealing end of the cylinder 1. A connecting post 13 is connected to the threaded hole 12. One end of the connecting post 13 has an external thread 14 on its outer wall that forms a threaded engagement with the threaded hole 12. A second piston 15 is provided at the end of the connecting post 13 away from the first piston 10.

[0028] The outer wall of the second piston 15 is fitted with a second sealing ring 16, and the connecting column 13 and the second piston 15 are integrally formed. The second piston 15 is detachably connected to the threaded hole 12 of the first piston 10 through the external thread 14 of the connecting column 13, which facilitates subsequent waste recycling. The second piston 15 is used to contact the liquid medicine to extract and inject the liquid medicine. The first piston 10 can further help improve the sealing effect during the entire process of extracting and injecting the liquid medicine.

[0029] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A syringe with anti-overflow function, comprising a barrel (1), characterized in that, The inner wall of the cylinder (1) is slidably engaged with a first piston (10). A push rod (4) is provided on one side of the first piston (10). Four fins (5) are provided at equal intervals on the outer wall of the push rod (4). A push plate (6) is provided at the end of the push rod (4) away from the first piston (10). A slot (17) is provided at the end of the four fins (5) away from the push rod (4) and close to the first piston (10). A retaining ring (3) is rotatably engaged at the four slots (17). Two retaining holes (18) are symmetrically provided on the outer side of the retaining ring (3). A connecting ring (19) is sleeved on the outer wall of the cylinder (1). Two end plates (8) are symmetrically fixed on the side of the connecting ring (19) facing the cylinder (1). A retaining plate (9) perpendicular to the end plate (8) is provided at the end of the two end plates (8) away from the connecting ring (19).

2. The syringe with anti-overflow function according to claim 1, characterized in that, The size of the card plate (9) is smaller than the size of the slot (18).

3. The syringe with anti-overflow function according to claim 1, characterized in that, Two ear plates (7) are symmetrically arranged on the outer wall of the open end of the cylinder (1).

4. The syringe with anti-overflow function according to claim 3, characterized in that, Both ear plates (7) are provided with arc-shaped channels (21) on their edges. Both ear plates (7) are provided with snap-fit ​​grooves (20) that communicate with the arc-shaped channels (21). T-shaped snap-fit ​​pins (22) that form snap-fit ​​with the snap-fit ​​grooves (20) are symmetrically provided on the connecting ring (19).

5. The syringe with anti-overflow function according to claim 1, characterized in that, The outer wall of the first piston (10) is fitted with a first sealing ring (11).

6. The syringe with anti-overflow function according to claim 5, characterized in that, The first piston (10) has a screw hole (12) on the side facing the sealing end of the cylinder (1). A connecting post (13) is connected to the screw hole (12). One end of the connecting post (13) has an external thread (14) that forms a screw connection with the screw hole (12). A second piston (15) is provided at the end of the connecting post (13) away from the first piston (10).

7. The syringe with anti-overflow function according to claim 6, characterized in that, The outer wall of the second piston (15) is fitted with a second sealing ring (16), and the connecting column (13) and the second piston (15) are integrally formed.

8. The syringe with anti-overflow function according to claim 1, characterized in that, The closed end of the cylinder (1) is provided with a liquid outlet (23), and a needle (2) is sleeved on the liquid outlet (23).

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