Syringe with plunger rebound pressure reduction structure

Abstract

To provide a syringe having a plunger repulsive pressure reduction structure capable of easily and gradually performing injection by dispersing repulsive pressure applied to a plunger.SOLUTION: In a syringe having a plunger repulsive pressure reduction structure formed by including a hub with an injection needle attached to a tip, a plunger 9 is formed in a conically tapered shape, a first step part 14a, a second step part 14b and a third step part 14c of three stages whose outer diameters are gradually made smaller as the plunger goes toward a top end are formed, and the plunger is configured so as to be correspondingly connected by forming a first diameter reduction part, a second diameter reduction part and a third diameter reduction part which are gradually made smaller as the plunger goes toward the top end on an inner surface of an inner injection liquid discharge port of a diameter reduction tube part of a barrel connected correspondingly to the step parts.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a syringe having a plunger repulsive pressure reduction structure, and more particularly to a syringe having a plunger repulsive pressure reduction structure that reduces the repulsive pressure applied to the plunger when the injection of the injection liquid is completed, thereby enabling a complete injection without any residual liquid remaining in the syringe. [Background technology]

[0002] Generally, syringes are classified into two types: a standard type that includes a syringe barrel as the main body, a push rod with a handle, a plunger that is attached to the tip of the push rod and pushes out the injection liquid by piston action, and a needle that is attached to a reduced diameter tubular part at the tip of the barrel; and a Luer Lock type that has a Luer Lock fastening part that can be screwed onto the tip of the barrel, and a hub with a syringe needle that is screwed onto this Luer Lock fastening part.

[0003] Syringes constructed in this manner generally have a plunger made of rubber or silicone attached to the tip of a pushing rod, and the front part is generally formed in a horizontal or approximately conical shape. However, the injection remaining in the reduced diameter tube formed at the end of the barrel cannot be pushed out, and the injection remains and is discarded. As the plunger approaches the tip of the syringe barrel, the injection must pass through the inner diameter of the injection needle, which is relatively small compared to the large diameter of the syringe barrel. This causes a gradually increasing repulsive pressure to act on the plunger due to the bottle-neck effect, making it difficult to push out the injection to the end. If continuous injections are required, medical staff will easily become fatigued, and this is especially difficult when the injection is viscous, making it very difficult for female nurses with weak grip strength and causing more pain to the person being injected.

[0004] As an example, a "syringe" was devised under Korean Utility Model Registration No. 20-0467647, which uses two pistons that are plungers and has a compartment piston section inserted at a distance from the main piston fastened to the piston rod, and different types of medicinal liquids are placed at a distance from the plug section at the tip. When the piston rod is pressed for use, the main piston is pressed and the compartment piston section is pressed and moved, and the medicinal liquids on the upper side move to the lower side through the moving space and are mixed, and are then pressed against the plug section at the tip and discharged into the syringe needle for injection.

[0005] However, like conventional general syringes, this syringe also has a horizontal tip of the piston, which is the plunger, so the more it moves forward toward the plug, the stronger the repulsive pressure becomes, and because there are two pistons, the stronger the pressure becomes, which makes it very difficult for nurses and others with weak hands to use.

[0006] Another example is the "Non-reusable disposable syringe with a structure to prevent the plunger from rotating" in Korean Utility Model Registration No. 20-0451044, which is a luer lock type syringe. The tip of the syringe barrel is long enough to be inserted into the needle holder, and the gasket, which is the plunger, is attached to the gasket support in a ring shape. A protrusion with a locking protrusion is provided at the tip of the gasket support, and an elastic piece formed inside the skirt tip pushes the elastic piece in after the final injection, but prevents it from coming out, so that the syringe cannot be reused once an injection has been made.

[0007] However, even with such a luer lock type syringe, the entire gasket of the plunger is horizontal, and as it moves toward the skirt tip, a repulsive pressure acts, making it very difficult to expel the entire injection.

[0008] Taking this into consideration, a tapered, oblong cone-shaped plunger has recently appeared. This structure has the effect of pushing out the injection liquid to the maximum extent and preventing residual injection liquid from remaining, but this also does not fundamentally solve the problem of the plunger's increasing repulsive force at the final point of injection, because the repulsive pressure is applied evenly across the entire body. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Korean Registered Utility Model No. 20-0467647 [Patent Document 2] Korean Registered Utility Model No. 20-0451044 Summary of the Invention [Problem to be solved by the invention]

[0010] The object of the present invention is to provide a syringe with a plunger repulsion pressure reduction structure that allows for gradual, effortless injection by forming the inner diameter of the reduced diameter tube section at the discharge section of the barrel tip and the outer diameter of the plunger in a tapered shape, and forming three stepped protrusions that become gradually thinner and shorter at intervals toward the tip, thereby dispersing the repulsion pressure acting on the plunger. [Means for solving the problem]

[0011] As a means for achieving the above object, the syringe with a plunger repulsion pressure reduction structure according to the present invention has a plunger formed in an elongated cone shape, with three stepped protrusions formed that become gradually thinner and with shorter intervals toward the tip, and the inner diameter of the reduced diameter tube part of the tip discharge part of the barrel into which the plunger is inserted also has three stepped recesses that become gradually smaller and with shorter intervals toward the upper end, corresponding to the plunger, and are joined together. This successively disperses the repulsion pressure that increases toward the tip of the discharge part, thereby enabling effortless injection without loss of remaining liquid medicine. [Effects of the Invention]

[0012] In the present invention, the plunger of a syringe is formed with multiple stepped protrusions that become gradually thinner and with gradually shorter intervals toward the tip, and the inner diameter of the reduced diameter tube portion of the distal discharge portion of the barrel is also formed with three stepped recesses that become gradually smaller and with gradually shorter intervals toward the upper end, corresponding to the plunger, and are connected to each other. This minimizes the repulsive pressure on the plunger from the beginning of the injection to the end, and injects the entire amount of injection solution without leaving any residual solution. This has the effect of allowing medical staff to inject without fatigue, even when repeatedly injecting multiple people consecutively, such as in coronavirus vaccine injections, and allowing the entire amount to be injected without the problem of important medicine remaining in the tip and being wasted. It can also be used very effectively with syringes that must inject injection solutions such as bone injection solutions with high dosing properties. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an assembled cross-sectional view of a syringe having a plunger rebound pressure reduction structure according to the present invention. FIG. [Figure 2] 1 is a partially enlarged cross-sectional assembly view of a syringe having a plunger rebound pressure reduction structure according to the present invention. FIG. [Figure 3] FIG. 1 is a front view of a plunger of a syringe having a plunger rebound pressure reduction structure according to the present invention. [Figure 4] 1 is a three-dimensional cross-sectional view of a plunger of a syringe having a plunger rebound pressure reduction structure according to the present invention. FIG. [Figure 5] 1 is a three-dimensional cross-sectional view of a syringe barrel having a plunger rebound pressure reduction structure according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Other objects and features of the present invention will become apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

[0015] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this invention pertains. Terms, such as those defined in commonly used dictionaries, should be interpreted to have a meaning consistent with the meaning they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application. Hereinafter, a syringe having a plunger repulsive pressure reducing structure according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

[0016] As shown in the figure, the syringe with a plunger repulsive pressure reduction structure according to the present invention is a typical luer lock syringe, in which a luer lock coupling 4 having a spiral portion 5 on its inner surface is formed on the outside of a reduced diameter tube portion 3 at the tip discharge portion of a barrel 1 having a finger grip 2 at its rear end, a pusher rod 6 having a pressure plate 7 at its rear end is inserted into the inside of the barrel 1, and a plunger fastening protrusion 8 at the tip of the pusher rod 6 is formed with a pusher rod fastening groove 10 formed on the inside of the lower end of a plunger 9, thereby fastening the pusher rod 6 to the plunger 9.

[0017] Meanwhile, fastening protrusions 11a and 11b protruding from both sides of the lower end of the hub 11 correspond to the helical portion 5 of the luer lock coupling portion 4 formed at the tip of the barrel 1, and are coupled along the helical portion 5 to fasten the hub 11. An injection needle 12 is fastened to the upper end of the hub 11 by passing through the interior, and a barrel reduced tube insertion groove 13 is formed on the inside of the lower portion, and the reduced tube portion 3 of the barrel 1 is inserted into the barrel 1 while the hub 11 is threaded and luer locked, thereby fastening the hub 11 with the attached injection needle 12.

[0018] Among these basic configurations, the plunger 9 is formed of a tapered, elongated cone-shaped rubber or silicone material, and has three steps, a first step 14a, a second step 14b, and a third step 14c, whose outer diameter gradually decreases and whose intervals between the steps gradually decrease toward the upper end to form the plunger 9. Correspondingly, a first reduced diameter portion 16a, a second reduced diameter portion 16b, and a third reduced diameter portion 16c are also formed on the inner surface of the inner injection solution discharge port 15 of the reduced diameter tube portion 3 of the barrel 1, which is coupled thereto. Similarly, the inner diameter of the inner injection solution discharge port 15 gradually decreases and whose intervals between the reduced diameter portions gradually decrease toward the upper end, so that the plunger 9 can be coupled thereto.

[0019] In the present invention configured as described above, just as when using a normal syringe, after inserting the injection needle 12 into a separate liquid medicine container, by pulling the pushing rod 6, the plunger 9 fastened to the tip of the needle moves backward within the barrel 1, filling the barrel 1 with the liquid medicine, and after inserting the injection needle into the skin of the person to be injected with the liquid medicine filled, by pushing the pushing rod 6, the plunger 9 moves forward within the barrel 1, pushing out the injection liquid filled inside and discharging it through the injection needle 12 to be injected, and when the plunger 9 reaches its end point, it is inserted far into the discharge port 15 inside the reduced diameter tube part 3 of the barrel 1.

[0020] Here, the first step portion 14a, the second step portion 14b, and the third step portion 14c of the plunger 9 come into contact in sequence with the first step portion 16a, the second step portion 16b, and the third step portion 16c formed in the outlet 15 inside the reduced diameter tube portion 3 of the barrel 1, thereby expelling the last remaining injection liquid through the injection needle 12. Here, the plunger 9 is formed in an oblong cone shape and has multiple steps with intervals that become gradually shorter toward the top, so that the pressure is gradually dispersed and the repulsive pressure acting on the plunger 9 is not actually large, allowing the injection liquid to be injected with a gentle and constant pressure until the end, so that the recipient does not feel any pain and the injection liquid can be expelled completely without remaining any.

[0021] The multi-stage diameter-reducing portion formed on the inner surface of the discharge port 15 inside the barrel diameter-reducing tube portion 3 and the multi-stage step portion formed on the plunger 9 in the present invention are illustrated as having three stages as a preferred embodiment, but they may be formed into two, four, or more stages depending on the size and capacity of the syringe, and it goes without saying that the spacing between the stages or the inclination angle of the stages can be variously modified depending on the situation at the time of design.

[0022] As described above, the present invention has been described based on specific details such as specific components, examples, and drawings. However, this is provided merely to facilitate a more general understanding of the present invention, and the present invention is not limited to the above examples. Various modifications and variations will be possible from such descriptions by those having ordinary knowledge in the field to which the present invention pertains.

[0023] Therefore, the concept of the present invention should not be limited to the above-described embodiments, and it can be said that not only the scope of the claims described below, but also all things equivalent to the scope of the claims or equivalent modifications thereof fall within the scope of the concept of the present invention. [Explanation of symbols]

[0024] 1 barrel 3 Reduced diameter pipe section 4 Luer lock connection 6 Push Rod 9 Plunger 11 Hub 12 Syringe needle 14a, 14b, 14c First, second, and third step portions 15 Discharge part 16a, 16b, 16c 1st, 2nd, 3rd reduced diameter section

Claims

1. A syringe with a plunger repulsion pressure reducing structure includes: a barrel (1) having a finger hook (2) formed at its rear end and a luer lock coupling (4) having a spiral portion (5) on its inner surface formed on the outside of a reduced diameter tube portion (3) at its tip discharge portion; a pusher rod (6) inserted inside the barrel (1) and having a pressure plate (7) at its rear end; a plunger (9) fastened to the tip of the pusher rod (6); and a hub (11) threadedly coupled to the luer lock coupling (4) and having an injection needle (12) attached to its tip, The plunger (9) is formed in a tapered conical shape, and the outer diameter of the plunger (9) gradually decreases toward the upper end. The plunger (9) is formed with three truncated cone-shaped steps: a first step (14a), a second step (14b), and a third step (14c), each of which is a truncated cone-shaped section; a truncated cone-shaped section connecting the first step (14a) and the second step (14b); a truncated cone-shaped section connecting the second step (14b) and the third step (14c); and a truncated cone-shaped section extending from the third step (14c) to the upper end. Correspondingly, the inner surface of the inner injection solution outlet (15) of the diameter-reduced tube (3) of the barrel (1) connected thereto is also formed with a first diameter-reduced section (16a), a second diameter-reduced section (16b), and a third diameter-reduced section (16c) that gradually decreases toward the upper end. The syringe having a plunger repulsion pressure reducing structure is characterized in that, as the plunger (9) moves toward the upper end while elastically deforming, the first reduced diameter portion (16a) and the first step portion (14a) first come into contact with each other, then the second reduced diameter portion (16b) and the second step portion (14b) come into contact with each other, and finally the third reduced diameter portion (16c) and the third step portion (14c) come into contact with each other.

2. 2. The syringe with a plunger repulsion pressure reduction structure according to claim 1, wherein the first step portion (14a), the second step portion (14b), and the third step portion (14c) formed on the plunger (9) are formed such that the distance between the second step portion (14b) and the third step portion (14c) is shorter than the distance between the first step portion (14a) and the second step portion (14b), and the distance becomes gradually shorter upward.

3. 2. The syringe with a plunger recoil pressure reducing structure according to claim 1, wherein the first, second, and third reduced diameter portions formed on the inner surface of the discharge port (15) inside the reduced diameter tube portion (3) of the distal discharge portion of the barrel (1) are formed such that the distance between the second and third reduced diameter portions (16b and 16c) is shorter than the distance between the first and second reduced diameter portions (16a and 16b), and the distance becomes gradually shorter upward.

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