Safety injector

Abstract

The safety type injector comprises an injector body, a quantitative structure and a safety structure, scale marks and threads are arranged on the barrel face of the injector body, the quantitative structure comprises a first short pipe, a straight rod and an annular plate which are fixed into a whole, the first short pipe is rotationally connected with the injector body in a threaded mode, the straight rod is in sliding fit with a barrel end plate of the injector body, and the annular plate is located on the rear portion of the barrel end plate. A piston rod of the injector penetrates through the annular plate; a limiting block is arranged at the front end of the straight rod; the safety structure comprises a second short pipe and a parallel rod which are fixed into a whole, the second short pipe can penetrate through the first short pipe, the straight rod penetrates through the middle of the parallel rod in a sliding mode, and the limiting block limits the rear end of the parallel rod. The syringe has the advantages that the safety structure is arranged, the second short tube can movably cover the steel needle head during injection operation, and stabbing is avoided; the quantitative structure is arranged and matched with the scale marks, so that the syringe can perform quantitative injection for multiple times by sucking liquid medicine once.

Description

Technical Field

[0001] This invention relates to the field of safety syringe technology, specifically to a safety syringe. Background Technology

[0002] Medical syringes are typically used with steel needles. Because the needles lack suitable protective covers, accidental punctures frequently occur during actual use. Furthermore, while existing syringes with graduated markings can dispense a single dose of medication, controlling the amount dispensed in multiple injections is difficult. This solution proposes a syringe that can both cover the needle tip and allow for multiple, precise injections, thus solving these existing technical problems. Summary of the Invention

[0003] The purpose of this invention is to provide a safe syringe to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solutions:

[0005] This invention provides a safety syringe, comprising a syringe, a metering structure, and a safety structure. The syringe barrel is provided with graduation lines and threads. The metering structure includes a short tube, a straight rod, and an annular plate that are fixed together. The short tube is threadedly rotatably connected to the syringe. The straight rod is slidably engaged with the syringe barrel end plate. The annular plate is located at the rear of the syringe barrel end plate. The piston rod of the syringe passes through the annular plate. A limiting block is provided at the front end of the straight rod.

[0006] The safety structure includes a fixed short tube II and a parallel rod. The short tube II can be sleeved through the short tube I. The straight rod is slidably inserted in the middle of the parallel rod. The limiting block limits the rear end of the parallel rod.

[0007] As an improvement, there are two straight rods arranged symmetrically, and two sets of parallel rods arranged symmetrically.

[0008] As an improvement, the front end of the straight rod forms a gap with the first short tube, and the second short tube can be inserted into the gap.

[0009] The advantages of this invention compared to the prior art are: a safety structure is provided, in which the short tube can be moved to cover the steel needle during injection to prevent puncture; a quantitative structure is provided, which, together with the scale lines, allows the syringe to draw up the drug solution once and inject it quantitatively multiple times. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings listed below are only some structural schematic diagrams of the present invention, and not all of them.

[0011] Figure 1This is a schematic diagram of the structure of a safety syringe according to the present invention.

[0012] Figure 2 This is a cross-sectional view of a safety syringe according to the present invention.

[0013] Figure 3 This is a schematic diagram of the quantitative structure of a safety syringe according to the present invention.

[0014] Figure 4 This is a schematic diagram of the safety structure of a safety syringe according to the present invention.

[0015] Figure label:

[0016] Syringe 1; graduation line 2; short tube 1 3; straight rod 4; ring plate 5; end plate 6; piston rod 7; limit block 8; short tube 2 8; parallel rod 10; interval 11. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of the embodiments of the present invention, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0019] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance. The use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be perfectly horizontal, but can be slightly tilted.

[0020] In the description of the embodiments of the present invention, the terms "multiple" or "several" refer to at least two.

[0021] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0022] This embodiment is combined with the appendix Figures 1 to 4 This paper provides a detailed description of a safety syringe.

[0023] This embodiment discloses a safety syringe, including a syringe 1, a metering structure, and a safety structure. The syringe 1 has graduation lines 2 and threads on its barrel surface. The metering structure includes a short tube 3, a straight rod 4, and an annular plate 5, which are fixed together. The short tube 3 is threadedly rotatably connected to the syringe 1. The straight rod 4 is slidably engaged with the barrel end plate 6 of the syringe 1. The annular plate 5 is located at the rear of the barrel end plate 6. The piston rod 7 of the syringe 1 passes through the annular plate 5. A limiting block 8 is provided at the front end of the straight rod 4.

[0024] The safety structure includes a fixed short tube 2 9 and a parallel rod 10. The short tube 2 9 can be sleeved through the short tube 1 3. The straight rod 4 is slidably inserted in the middle of the parallel rod 10. The limiting block 8 limits the rear end of the parallel rod 10.

[0025] There are two straight rods 4, arranged symmetrically, and there are two sets of parallel rods 10, arranged symmetrically.

[0026] The front end of the straight rod 4 forms a gap 11 with the short tube 3, and the short tube 9 can be inserted into the gap 11.

[0027] In practice, a steel needle is inserted into the front end of syringe 1. Before injection, the safety structure can be pulled outward to move the short tube 2 9 away from the gap 11 and cover the front end of the steel needle to prevent puncture. During injection, the short tube 2 9 can move without affecting the injection. After injection, when the steel needle is quickly pulled out, due to inertia and the fact that the short tube 2 9 can slide forward, the steel needle tip can immediately retract into the short tube 2 9 and be covered to prevent puncture. The limiting block 8 can hold the rear end of the parallel rod 10 to prevent the parallel rod 10 from detaching from syringe 1.

[0028] After aspirating the liquid, observe the liquid level mark 2. Rotate the metering structure to align the rear end of the short tube 3 with the mark 2 where the liquid level needs to drop. The distance between the ring plate 5 and the rear end of the piston rod 7 is equal to the liquid level difference to be injected. When injecting, the ring plate 5 limits the rear end of the piston rod 7 to achieve the purpose of controlling the metered injection, and multiple metered injections are possible.

[0029] The present invention and its embodiments have been described above. This description is not restrictive, and the actual scope of protection is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this invention should be included within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A safety syringe, characterized in that, The syringe (1) includes a syringe, a metering structure and a safety structure. The syringe (1) has a scale line (2) and a thread on its barrel surface. The metering structure includes a short tube (3) fixed in one piece, a straight rod (4) and a ring plate (5). The short tube (3) is threadedly rotatably connected to the syringe (1). The straight rod (4) is slidably engaged with the barrel end plate (6) of the syringe (1). The ring plate (5) is located at the rear of the barrel end plate (6). The piston rod (7) of the syringe (1) passes through the ring plate (5). The front end of the straight rod (4) is provided with a limiting block (8). The safety structure includes a fixed short tube two (9) and a parallel rod (10). The short tube two (9) can be sleeved through the short tube one (3). The straight rod (4) slides through the middle of the parallel rod (10). The limiting block (8) limits the rear end of the parallel rod (10).

2. A safety syringe according to claim 1, characterized in that, There are two straight rods (4) arranged symmetrically, and there are two sets of parallel rods (10) arranged symmetrically.

3. A safety syringe according to claim 1, characterized in that, The front end of the straight rod (4) forms a gap (11) with the first short tube (3), and the second short tube (9) can be inserted into the gap (11).

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