A syringe with a dosing structure

Abstract

This invention belongs to the field of syringe technology, specifically a syringe with a quantitative structure. Addressing the problem of large dosage errors and difficulty in achieving quantitative aspiration mentioned in the background technology, the following solution is proposed: A shell is included, with an end cap fixedly connected to one end of the outer wall. A syringe is inserted into the inner wall of the end cap. A scale strip is provided on one side of the outer wall of the syringe. A quantitative adjustment sleeve is screwed onto the inner wall of the shell and slidably connected to the inner wall of the syringe. This invention allows for precise adjustment of its position by rotating a handwheel, thereby limiting the piston's stroke. The sliding cooperation between the limiting plate and the limiting groove ensures stable piston movement trajectory, avoiding dosage errors caused by deviation. The scale strip on the outside of the syringe and the scale positioning ring on the quantitative adjustment sleeve form a double calibration. The position of the scale positioning ring is the standard for liquid dosage. The user can directly read the currently set dosage through the observation window, improving operational intuitiveness.

Description

Technical Field

[0001] This utility model relates to the field of syringe technology, and in particular to a syringe with a quantitative structure. Background Technology

[0002] Syringes, as common medical devices, are widely used in medical, laboratory, and other fields, primarily for the precise extraction and injection of liquids. Traditional syringes typically consist of a syringe barrel, piston, and plunger. Dosage control relies on the user visually observing the graduations on the syringe barrel and manually pushing the piston. However, this method has the following drawbacks:

[0003] In clinical treatment, especially in scenarios requiring high-precision drug delivery (such as insulin injection, pediatric medication, or chemotherapy drug preparation), dosage errors with traditional syringes can directly threaten patient safety. For example, pediatric drug dosages are typically very small (in units of 0.1 mL), and even slight visual deviations or hand tremors during manual operation can lead to dosage deviations exceeding 10%. Furthermore, in laboratory studies, reproducible experiments require strictly consistent fluid volumes, but traditional syringes lack mechanical limiting structures, requiring operators to repeatedly adjust the piston position, which is not only time-consuming but also makes it difficult to ensure consistency across multiple operations.

[0004] Because traditional syringes rely on visual inspection and manual operation, especially during rapid or frequent use, inaccurate dosages can easily occur due to visual errors or improper operation, affecting treatment efficacy or experimental results. Furthermore, traditional syringes require repeated adjustments to the piston position to achieve quantitative extraction or expulsion, resulting in low efficiency and difficulty in ensuring repeatability for each operation. Utility Model Content

[0005] In view of the shortcomings of the prior art, this utility model provides a syringe with a quantitative structure, which overcomes the shortcomings of the prior art and effectively solves the problems of large dosage error and difficulty in achieving quantitative aspiration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A syringe with a quantitative structure includes a housing, a tip fixedly connected to one end of the housing, and a syringe inserted into the inner wall of the tip. A scale strip is provided on one side of the outer wall of the syringe. A quantitative adjustment sleeve is screwed onto the inner wall of the housing and slidably connected to the inner wall of the syringe. A scale positioning ring is fixedly connected to one end of the outer wall of the quantitative adjustment sleeve, and a handwheel is fixedly connected to the other end of the outer wall of the quantitative adjustment sleeve. A piston is slidably connected to the inner wall of the syringe, and a push-pull rod is fixedly connected to one side of the outer wall of the piston. A limit plate is provided on the outer wall of the push-pull rod.

[0008] The above-described design uses a lightweight medical plastic shell with a fixed connector at one end. A syringe is inserted into the connector, and the syringe is made of transparent glass or polymer material for easy observation of the liquid level. The metering adjustment sleeve is connected to the inner wall of the shell via threads. When the handwheel is rotated, the metering adjustment sleeve moves axially along the inner wall of the syringe, and its displacement is displayed by a graduated positioning ring. The limiting groove is an annular groove in which a limiting plate is embedded, ensuring that the push-pull rod can only move in a straight line and preventing piston deflection. The end of the limiting groove is the maximum suction depth of the limiting plate.

[0009] Preferably, a liquid inlet is installed on the bottom outer wall of the end, and a liquid inlet hose is fixedly connected to the bottom outer wall of the liquid inlet. A liquid drain is installed on the outer wall of the end of the end away from the outer shell, and a liquid drain hose is fixedly connected to the outer wall of the liquid drain.

[0010] With the above-described method, when aspirating liquid, the liquid is introduced from the collection tubing into the inlet port and stored in the syringe. When injecting liquid, the liquid is squeezed out of the syringe and then flows through the outlet port to the outlet tubing. The tubing interface supports quick connection and is suitable for continuous infusion or batch collection scenarios.

[0011] Preferably, the outer wall of the housing is provided with a fixed handle for placing the index and middle fingers, and one end of the push-pull rod is provided with a movable handle for placing the thumb.

[0012] The above design integrates the fixed handle with the outer shell, featuring an anti-slip texture on the surface; the movable handle connects to the push-pull rod, supporting thumb pressing operation. Both the fixed and movable handles are designed with separate fingers, conforming to ergonomics and reducing operator fatigue.

[0013] Preferably, observation windows are provided on both sides of the outer wall of the outer casing, and the scale bar is located inside the observation window.

[0014] Preferably, a limiting groove is formed on the inner wall of the quantitative adjustment sleeve, and the limiting plate is slidably connected to the inner wall of the limiting groove.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The syringe with a quantitative structure designed in this invention has a quantitative adjustment sleeve connected to the inner wall of the outer shell by a thread. The position of the sleeve can be precisely adjusted by rotating the handwheel, thereby limiting the piston stroke. The sliding fit between the limiting plate and the limiting groove ensures the stability of the piston movement trajectory and avoids dosage errors caused by deviation.

[0017] 2. The syringe with a quantitative structure designed in this way has a double calibration formed by the scale bar on the outside of the syringe and the scale positioning ring on the quantitative adjustment sleeve. The scale bar can intuitively show the liquid volume, and the position of the scale positioning ring is the standard for liquid quantitative measurement. Users can directly read the current set dose through the observation window, which improves the intuitiveness of operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a syringe with a quantitative structure proposed in this utility model.

[0019] Figure 2 This is a schematic diagram of the syringe structure of a syringe with a quantitative structure proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of a syringe with a quantitative structure proposed in this utility model.

[0021] In the diagram: 1. Outer shell; 2. End; 3. Syringe; 4. Scale bar; 5. Quantitative adjustment sleeve; 6. Scale positioning ring; 7. Handwheel; 8. Piston; 9. Push-pull rod; 10. Limiting plate; 11. Liquid inlet; 12. Liquid outlet; 13. Liquid dispensing hose; 14. Liquid drain hose; 15. Fixed handle; 16. Movable handle; 17. Observation window; 18. Limiting groove. 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, refer to Figures 1-3 A syringe with a quantitative structure includes a housing 1, with a tip 2 fixedly connected to the outer wall of one end of the housing 1, and a syringe 3 inserted into the inner wall of the tip 2. The housing 1 is made of lightweight medical plastic, with the tip 2 fixedly connected to one end, and the syringe 3 inserted into the tip 2. The syringe 3 is made of transparent glass or polymer material to facilitate observation of the liquid level.

[0024] A graduated strip 4 is provided on one outer wall of the syringe 3. A quantitative adjustment sleeve 5 is screwed onto the inner wall of the outer shell 1, and the quantitative adjustment sleeve 5 is slidably connected to the inner wall of the syringe 3. A graduated positioning ring 6 is fixedly connected to one outer wall of the quantitative adjustment sleeve 5, and a handwheel 7 is fixedly connected to the other outer wall of the quantitative adjustment sleeve 5. The quantitative adjustment sleeve 5 is connected to the inner wall of the outer shell 1 by threads. When the handwheel 7 is rotated, the quantitative adjustment sleeve 5 moves axially along the inner wall of the syringe 3, and its displacement is displayed by the graduated positioning ring 6.

[0025] A piston 8 is slidably connected to the inner wall of the syringe 3, and a push-pull rod 9 is fixedly connected to the outer wall of one side of the piston 8. A limiting plate 10 is provided on the outer wall of the push-pull rod 9. The limiting groove 18 is an annular groove in which the limiting plate 10 is embedded, ensuring that the push-pull rod 9 can only move in a straight line and preventing the piston 8 from deflecting. The end of the limiting groove 18 is the maximum suction depth of the limiting plate 10.

[0026] In this embodiment, the metering adjustment sleeve 5 is threaded to the inner wall of the outer casing 1. Rotating the handwheel 7 allows for precise position adjustment, thereby limiting the stroke of the piston 8. Furthermore, the sliding engagement between the limiting disc 10 and the limiting groove 18 ensures a stable movement trajectory for the piston 8, preventing dosage errors caused by deviation. The scale bar 4 on the outside of the syringe 3 and the scale positioning ring 6 on the metering adjustment sleeve 5 form a dual calibration. The scale bar 4 provides a clear indication of the liquid volume, and the position of the scale positioning ring 6 indicates the standard for liquid metering. Users can directly read the currently set dosage through the observation window 17, enhancing operational intuitiveness.

[0027] Reference Figures 1-2 The end cap 2 has an inlet port 11 installed on its bottom outer wall, and a liquid collection tube 13 is fixedly connected to the bottom outer wall of the inlet port 11. The end of the end cap 2 away from the outer shell 1 has a drain port 12 installed on its outer wall, and a drain tube 14 is fixedly connected to the outer wall of the drain port 12. The inlet port 11 and the drain port 12 are respectively connected to the liquid collection tube 13 and the drain tube 14. When aspirating liquid, the liquid is introduced from the liquid collection tube 13 into the inlet port 11 and stored in the syringe 3. When injecting liquid, the liquid is squeezed out of the syringe 3 and then flows along the drain port 12 to the drain tube 14. The tube interface supports quick connection and is suitable for continuous infusion or batch liquid collection scenarios.

[0028] Reference Figure 1 The outer wall of the outer casing 1 is provided with a fixed handle 15 for placing the index and middle fingers, and one end of the push-pull rod 9 is provided with a movable handle 16 for placing the thumb. The fixed handle 15 is integrally formed with the outer casing 1 and has an anti-slip texture on its surface; the movable handle 16 is connected to the push-pull rod 9 and supports thumb pressing operation. The fixed handle 15 and the movable handle 16 adopt a finger-separating design, which conforms to ergonomics and reduces operating fatigue.

[0029] Reference Figure 2 The outer walls on both sides of the outer shell 1 are provided with observation windows 17, and the scale bar 4 is located inside the observation window 17.

[0030] Reference Figure 3 The inner wall of the quantitative adjustment sleeve 5 is provided with a limiting groove 18, and the limiting plate 10 is slidably connected to the inner wall of the limiting groove 18.

[0031] Working principle:

[0032] 1. Dosage setting stage: Rotate handwheel 7 to drive quantitative adjustment sleeve 5 to move axially, and determine the maximum stroke of piston 8 through scale positioning ring 6, thereby setting the volume of liquid to be drawn or discharged.

[0033] 2. Liquid collection stage: Insert the liquid collection tube 13 into the liquid container, pull the movable handle 16 backward, and the piston 8 will retract under negative pressure. The liquid enters the syringe 3 through the liquid inlet 11 until the piston 8 contacts the limiting surface of the metering adjustment sleeve 5.

[0034] 3. Drainage stage: Connect the drainage hose 14 to the target position, push the movable handle 16 forward, and the piston 8 pushes the liquid out through the drainage port 12. The amount of liquid discharged is precisely controlled by the preset limit position.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A syringe with a dosing structure comprising a housing (1), characterized in that, One end of the outer wall of the outer shell (1) is fixedly connected to an end (2), and a syringe (3) is inserted into the inner wall of the end (2). A scale strip (4) is provided on one side of the outer wall of the syringe (3). A quantitative adjustment sleeve (5) is screwed onto the inner wall of the outer shell (1), and the quantitative adjustment sleeve (5) is slidably connected to the inner wall of the syringe (3). A scale positioning ring (6) is fixedly connected to one side of the outer wall of the quantitative adjustment sleeve (5), and a handwheel (7) is fixedly connected to the other side of the outer wall of the quantitative adjustment sleeve (5). A piston (8) is slidably connected to the inner wall of the syringe (3), and a push-pull rod (9) is fixedly connected to one side of the outer wall of the piston (8). A limit plate (10) is provided on the outer wall of the push-pull rod (9).

2. The syringe with a quantitative structure according to claim 1, characterized in that, The end (2) is equipped with a liquid inlet (11) on the bottom outer wall, and a liquid inlet hose (13) is fixedly connected to the bottom outer wall of the liquid inlet (11).

3. The syringe with a fixed amount structure according to claim 1, wherein, The end (2) away from the outer wall of the outer shell (1) is provided with a drain port (12), and a drain hose (14) is fixedly connected to the outer wall of the drain port (12).

4. The syringe with a fixed amount structure according to claim 1, wherein, The outer wall of the outer casing (1) is provided with a fixed handle (15) for placing the index and middle fingers, and the outer wall of one end of the push-pull rod (9) is provided with a movable handle (16) for placing the thumb.

5. The syringe with a fixed amount structure according to claim 1, wherein, The outer walls on both sides of the outer casing (1) are provided with observation windows (17), and the scale bar (4) is located inside the observation window (17).

6. The syringe with a fixed amount structure according to claim 1, wherein, The inner wall of the quantitative adjustment sleeve (5) is provided with a limiting groove (18), and the limiting plate (10) is slidably connected to the inner wall of the limiting groove (18).

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