Syringe capable of removing residual pressure

Abstract

The present invention relates to a syringe capable of releasing residual pressure, comprising: a barrel 110 filled with a medicine and having a medicine discharge hole 113c formed at one end; a plunger 120 inserted into the barrel 110 and configured to discharge the medicine into the medicine discharge hole 113c as it advances when pressurized, the plunger 120 having a coupling shaft 122 protruding a certain length from a front pressure plate 121 toward the medicine discharge hole 113c; a gasket coupling ring 130 coupled to a rear end of the coupling shaft 122; and a residual pressure release gasket 140 coupled to the gasket coupling ring 130 so as to cover the coupling shaft 122 at its front, for releasing the internal residual pressure and preventing additional leakage of the medicine when pressure applied to the plunger 120 is released. The gasket coupling ring 130 is coupled to the coupling shaft 122 so as to be spaced apart from the front pressure plate 121 of the plunger 120 by a reference distance, and the ... Therefore, when the plunger 120 advances inside the barrel 110, the coupling shaft 122 advances while applying pressure to the inside of the residual pressure relief gasket 140 so that the front pressure plate 121 abuts against the gasket coupling ring 130. The residual pressure relief gasket 140 includes a fixing band 141 that is fitted into the gasket coupling ring 130 and closely contacts the inner wall surface of the barrel 110, a tip cap 145 that covers the tip of the coupling shaft 122, and a tilted deformation cap 143 that connects the fixing band 141 and the tip cap 145 in an inclined manner, elastically expands when the plunger 120 is pressurized, moving the tip cap 145 forward together with the coupling shaft 122, and contracts to an initial length when the pressure of the plunger 120 is released, applying an elastic force so that the plunger 120 moves backward by the reference distance.

Description

Technical Field

[0001] The present invention relates to a syringe, and more particularly to a syringe capable of removing residual pressure that can remove the residual pressure applied to the plunger after the pressure applied to the plunger for discharging the chemical solution is released and prevent leakage of the chemical solution.

Background Art

[0002] Syringes are widely used for medical or industrial purposes. Medical syringes are used to inject chemical solutions into patients, and industrial syringes are used to discharge chemicals such as industrial adhesives in a defined dosage.

[0003] FIG. 1 is an exemplary diagram showing the configuration of a conventional syringe 10. As shown, the conventional syringe 10 includes a barrel 11 that houses a chemical solution A, a plunger 15 that advances inside the barrel 11, and a nozzle 13 that is coupled to the tip of the barrel 11 and discharges the chemical solution.

[0004] In the conventional syringe 10, when the user presses the plunger 15 by hand while applying pressure, the plunger 15 advances inside the barrel 11 and discharges the chemical solution A to the nozzle 13. Then, when the pressure applied to the plunger 15 is released, the discharge of the chemical solution A stops.

[0005] However, in the conventional syringe 10, even when the pressure applied by hand to press the plunger 15 is released, there is a problem that residual pressure for advancing the plunger 15 remains inside, and the chemical solution A leaks out little by little from the nozzle 13.

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to solve the above-described problems and provide a syringe that can remove residual pressure remaining inside and prevent additional leakage of the chemical solution when the pressure applied to the plunger is released.

[0007] The above objects and various advantages of the present invention will become more apparent to those skilled in the art from the preferred embodiments of the present invention.

Means for Solving the Problems

[0008] The object of the present invention can be achieved by a syringe capable of removing residual pressure. The syringe of the present invention includes a barrel 110 filled with a drug inside and having a drug solution discharge hole 113c formed at one end, a plunger 120 inserted inside the barrel 110 and discharging the drug solution to the drug solution discharge hole 113c while advancing by pressurization, with a coupling shaft 122 protruding a certain length from a front pressurizing plate 121 toward the drug solution discharge hole 113c; a gasket coupling ring 130 coupled to the rear end of the coupling shaft 122; and a residual pressure removal gasket 140 coupled to the gasket coupling ring 130 so as to cover the coupling shaft 122 from the front, which removes the internal residual pressure and prevents additional leakage of the drug solution when the pressure applied to the plunger 120 is released. The gasket coupling ring 130 is coupled to the coupling shaft 122 so as to be separated from the front pressurizing plate 121 of the plunger 120 by a reference distance. When the plunger 120 advances inside the barrel 110 by pressurization, the coupling shaft 122 advances while pressurizing the inside of the residual pressure removal gasket 140 so that the front pressurizing plate 121 abuts against the gasket coupling ring 130. The residual pressure removal gasket 140 includes a fixing band 141 fitted to the gasket coupling ring 130 and in close contact with the inner wall surface of the barrel 110, a tip cap 145 covering the tip of the coupling shaft 122; and an inclined deformation cap 143 that connects the fixing band 141 and the tip cap 145 in an inclined manner, elastically extends when the plunger 120 is pressurized, moves the tip cap 145 forward together with the coupling shaft 122, contracts to the initial length when the pressurization of the plunger 120 is released, and applies an elastic force so that the plunger 120 retreats by the reference distance.

[0009] According to an embodiment, the gasket coupling ring 130 includes a ring body 131 fitted onto the coupling shaft 122, a rear flange 135 formed to protrude along the outer peripheral edge so as to be separated from the front pressing plate 121 by a reference distance from the rear end of the ring body 131, and a front flange 133 formed to protrude from the tip of the ring body 131 along the outer peripheral edge at a height lower than that of the rear flange 135 and forming a band fitting groove 137 into which the fixing band 141 is fitted between the front flange 133 and the rear flange 135. The coupling shaft 122 may be provided with a movement restriction protrusion 123 formed to protrude so as to contact the front flange 133 and restricting the forward movement of the gasket coupling ring 130.

[0010] According to an embodiment, the tip cap 145 is provided with a length that can expose the tip of the coupling shaft 122 to the outside, and the syringe of the present invention may further include a tip detachment prevention protrusion 124 provided in a coupling region between the tip cap 145 and the coupling shaft 122 and fixing the position of the tip cap 145.

Advantages of the Invention

[0011] According to the syringe according to the present invention, a coupling shaft protrudes from the tip of the plunger, and a gasket coupling ring and a residual pressure removal gasket are coupled to the coupling shaft. The residual pressure removal gasket elastically increases in length when the plunger is pressurized, and when the pressure on the plunger is released, an elastic force is applied to return to the initial length, so that the plunger can retreat by a reference length while removing the internal residual pressure.

[0012] This can effectively solve the problem that the internal chemical solution leaks little by little due to the residual pressure even after the pressure of the conventional syringe is released.

Brief Description of the Drawings

[0013]

Figure 1

[0014]

Figure 2

[0015]

Figure 3

[0016]

Figure 4

[0017]

Figure 5

[0018]

Figure 6

[0019]

Figure 7

Mode for Carrying Out the Invention

[0020] To fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention can be deformed into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. These embodiments are provided to more fully explain the present invention to those having average knowledge in the art. Therefore, the shapes of the elements in the drawings may be exaggerated for the purpose of emphasizing a clearer explanation. It should be noted that the same members in each drawing may be denoted by the same reference numerals. A detailed description of known functions and configurations that may obscure the gist of the present invention is omitted.

[0021] FIG. 2 is a perspective view showing the configuration of the syringe 100 according to the present invention, FIG. 3 is an exploded perspective view showing the configuration of the syringe 100 disassembled, and FIGS. 4 to 6 are cross-sectional exemplary views showing the operation process of the syringe 100.

[0022] As shown in FIGS. 2 and 3, the syringe 100 of the present invention includes a barrel 110 in which a chemical solution A is stored, a plunger 120 that moves from the rear end to the front end of the barrel 110 and pressurizes the chemical solution A to be discharged, a gasket coupling ring 130 coupled to the front end of the plunger 120, and a residual pressure removal gasket 140 that is coupled to the front end of the plunger 120 through the gasket coupling ring 130 and removes the residual pressure while moving the plunger 120 backward by a reference distance when the pressure applied to the plunger 120 is released.

[0023] In the syringe 100 of the present invention, a residual pressure removal gasket 140 that elastically varies and moves the plunger 120 that has stopped with the pressure released backward by a reference position by the residual pressure is provided at the front end of the plunger 120. This can solve the problem that the chemical solution continuously leaks due to the residual pressure in the prior art.

[0024] The barrel 110 stores the chemical solution A inside and discharges the chemical solution A by the pressure applied by the plunger 120. A nozzle 200 for discharging the chemical solution A or an adapter (not shown) is coupled to the front end of the barrel 110.

[0025] As shown in FIGS. 3 and 4, the barrel 110 includes a barrel body 111 in which a chemical solution is stored inside, a connection end 113 provided at the front end of the barrel body 111 to which the nozzle 200 or the adapter is detachably coupled and a chemical solution discharge hole 113c is formed, and a flange 115 provided at the rear end of the barrel body 111 to support the movement of the plunger 120.

[0026] The connection end 113 includes an inner tube 113a in which the chemical solution discharge hole 113c is formed, and an outer tube 113b that is formed at a certain distance from the inner tube 113a and forms a nozzle insertion groove 113d into which the nozzle 200 is inserted.

[0027] The plunger 120 is inserted into the rear end of the barrel 110 and advances along the inner wall surface of the barrel 110 by the pressure applied by the user, and pressurizes so that the chemical solution A is discharged from the chemical solution discharge hole 113c. The plunger 120 is formed in the form of a rod whose outer diameter corresponds to the inner diameter of the barrel 110.

[0028] At the tip of the plunger 120, a front pressure plate 121 that moves while pressurizing the chemical solution is provided, and at the rear end, a rear pressure plate 125 that is pressurized by the user is provided. In the central region of the front pressure plate 121, as shown in FIGS. 3 and 4, a coupling shaft 122 to which the residual pressure removal gasket 140 is coupled protrudes by a certain length. The coupling shaft 122 is formed such that its outer diameter becomes constant toward the tip 122a and gradually narrows, facilitating the coupling of the residual pressure removal gasket 140.

[0029] In the path of the coupling shaft 122, a plurality of movement limiting protrusions 123 are formed to protrude from the plate surface at regular angular intervals. As shown in the enlarged view in FIG. 4, the movement limiting protrusions 123 contact and support the gasket coupling ring 130 so that its position is fixed without being pushed forward when the gasket coupling ring 130 is fitted onto the coupling shaft 122.

[0030] The movement limiting protrusions 123 are provided at a position separated by a distance obtained by adding the reference distance d from the front pressure plate 121 and the length of the ring body 131, as shown in the enlarged view in FIG. 4. Thereby, when the gasket coupling ring 130 is coupled so as to contact the movement limiting protrusion 123 of the coupling shaft 122, the gasket coupling ring 130 is positioned at a distance of the reference distance d from the front pressure plate 121.

[0031] The gasket coupling ring 130 is fitted onto the coupling shaft 122 to fix the position of the residual pressure removal gasket 140. The gasket coupling ring 130 is provided in the form of a ring having elasticity to be fitted onto the coupling shaft 122, a ring body 131, a front flange 133 formed to protrude radially outward by a certain height from the tip of the ring body 131, and a rear flange 135 formed to protrude radially outward from the rear end of the ring body 131 at a height corresponding to the inner diameter of the barrel 110 are integrally formed.

[0032] The ring body 131 is formed in the form of a ring through which a shaft insertion hole 132 into which the coupling shaft 122 is inserted penetrates. The ring body 131 is formed of an elastically stretchable rubber or silicone material, or plastic. The front flange 133 and the rear flange 135 are respectively formed vertically along the circumferential direction in front of and behind the ring body 131. The rear flange 135 is formed at a height corresponding to the inner diameter of the barrel 110, prevents the residual pressure removal gasket 140 from detaching when the plunger 120 moves, and blocks the reverse movement of the chemical solution A while contacting the inner wall surface of the barrel 110.

[0033] The front flange 133 is formed at a lower height than the rear flange 135, and a band fitting groove 137 is formed between the front flange 133 and the rear flange 135. Further, due to the height difference between the front flange 133 and the rear flange 135, the front flange 133 supports the inclined deformation cap 143 of the residual pressure removal gasket 140 so as to cover the outside of the coupling shaft 122 and the gasket coupling ring 130 in an inclined form.

[0034] At this time, the front flange 133 forms an inclined surface 133a whose outer diameter becomes narrower from the rear to the front at the end thereof, and supports the inside so that the inclined deformation cap 143 maintains a shape whose width becomes narrower toward the tip.

[0035] The residual pressure removal gasket 140 is coupled to the gasket coupling ring 130 so as to cover the coupling shaft 122, and moves inside the barrel 110 together with the plunger 120 to discharge the chemical solution A. Further, when the pressure applied to the plunger 120 is released, the residual pressure removal gasket 140 moves the plunger 120 backward by a reference distance so as to remove the residual pressure applied to the plunger 120, and can prevent additional leakage of the chemical solution A.

[0036] The residual pressure removal gasket 140 includes a fixing band 141 fitted into the band fitting groove 137 of the gasket coupling ring 130, a tip cap 145 fitted so as to cover the tip of the coupling shaft 122, and an inclined deformation cap 143 that connects the tip cap 145 and the fixing band 141 and applies an elastic force so that the plunger 120 moves backward while being elastically deformed.

[0037] The tip cap 145, the inclined deformation cap 143, and the fixing band 141 have an integrated structure formed of an elastic material with a closed tip and an insertion space formed at the rear end into which the coupling shaft 122 is inserted. First, for the residual pressure removal gasket 140, the fixing band 141 is inserted into the coupling shaft 122, and the coupling shaft 122 is inserted into the interior of the tip cap 145 while being pulled toward the gasket coupling ring 130. Then, the pulled fixing band 141 is fitted into the band fitting groove 137 of the gasket coupling ring 130.

[0038] The fixing band 141 is formed thicker than other regions and is fixed in position while being elastically fitted into the band fitting groove 137. The outer diameter of the fixing band 141 contacts the inner wall surface of the barrel 110 and blocks the reverse flow of the chemical solution A toward the plunger 120.

[0039] The tip cap 145 is formed to have a length that can sufficiently cover the tip 122a of the coupling shaft 122 from the movement restriction protrusion 123. The inclined deformation cap 143 connects the tip cap 145 from the fixing band 141 and is formed to have a relatively thin thickness compared to the fixing band 141 and the tip cap 145. Thereby, the inclined deformation cap 143 is provided so as to be easily elastically deformed.

[0040] The inclined deformation cap 143 is supported by the inclined surface 133a of the front flange 133 and the movement restriction protrusion 123, and is connected to the tip cap 145 so that the outer diameter gradually narrows from the rear to the front. The inclined deformation cap 143 discharges the chemical solution while elastically deforming its shape depending on whether the user discharges the chemical solution while pressing the plunger 120, or prohibits additional discharge of the chemical solution by retracting the plunger 120.

[0041] As shown in FIG. 4, in the initial state where the plunger 120 is not pressurized, after the residual pressure removal gasket 140 is put on the coupling shaft 122, the position is fixed by fitting the fixing band 141 into the gasket coupling ring 130. At this time, the first length L1 is maintained from the inclined deformation cap 143 to the tip cap 145. And, the front pressure plate 121 of the plunger 120 maintains a state separated from the rear flange 135 of the gasket coupling ring 130 by the reference length d.

[0042] As shown in FIG. 5, when the user pressurizes the rear pressure plate 125, the plunger 120 advances inside the barrel 110. As a result, the front pressure plate 121 of the plunger 120 advances while being pressurized and comes into contact with the rear flange 135, and the coupling shaft 122 also advances toward the tip cap 145 inside the residual pressure removal gasket 140.

[0043] At this time, the length L3 becomes longer while the inclined deformation cap 143 elastically deforms by the moving distance of the coupling shaft 122, that is, the reference length d, and the second length L2 from the inclined deformation cap 143 to the tip cap 145 becomes longer than the first length L1.

[0044] With the residual pressure removal gasket 140 deformed to the second length L2, the plunger 120 advances, and the chemical solution A is discharged to the outside through the nozzle 200.

[0045] When the user completes the pressurization of the plunger 120 at the position where the desired amount of the chemical solution is discharged, the user stops the pressurization on the plunger 120. When the pressurization on the plunger 120 is released, as shown in FIG. 6, the inclined deformation cap 143 deformed to be elastically elongated applies an elastic force to the coupling shaft 122 housed therein in order to return to the initial length. As a result, as enlarged and shown in FIG. 6, the coupling shaft 122 and the plunger 120 move backward by a reference distance d, and the front pressure plate 121 moves to a position separated from the rear flange 135 by the reference distance d.

[0046] In this way, while the plunger 120 moves backward by the reference distance d due to the elastic force of the inclined deformation cap 143, the residual pressure applied to the plunger 120 is removed, additional discharge of the chemical solution through the nozzle 200 is prevented, and only an accurate amount of the chemical solution can be discharged.

[0047] On the other hand, FIG. 7 is an exemplary view showing a modified example of the residual pressure removal gasket 140a of the present invention. The residual pressure removal gasket 140 according to the above-described preferred embodiment is configured such that the fixed band 141, the inclined deformation cap 143, and the tip cap 145 are integrally formed.

[0048] However, this is only one embodiment. As shown in FIG. 7, the fixed band 141 and the inclined deformation cap 143 are integrally formed while being fitted into the gasket coupling ring 130, and the tip cap 145 is provided to expose the tip of the coupling shaft 122 while being formed short.

[0049] At this time, the end of the tip cap 145 is formed thicker than other regions and is fixed in position by engaging with the tip detachment prevention projection 124 protruding from the coupling shaft 122. Thereby, it seals so that the chemical solution A does not flow back.

[0050] Also in this case, when pressurizing or releasing the pressure on the plunger 120, the inclined deformation cap 143 increases in length while elastically deforming or contracts to the initial length, and removes the residual pressure by moving the plunger 120 backward.

[0051] As described above, in the syringe according to the present invention, the coupling shaft protrudes from the tip of the plunger, and the gasket coupling ring and the residual pressure removal gasket are coupled to the coupling shaft. The residual pressure removal gasket elastically increases in length when the plunger is pressurized, and when the pressure on the plunger is released, an elastic force is applied to return to the initial length, and the residual pressure inside can be removed while the plunger moves backward by the reference length.

[0052] Thereby, it is possible to effectively solve the problem that the chemical solution inside leaks little by little due to the residual pressure even after the pressure on the syringe is released in the prior art.

[0053] The embodiments of the syringe of the present invention described above are merely exemplary, and those having ordinary knowledge in the technical field to which the present invention pertains will understand that various modifications and equivalent other embodiments will be possible hereinafter. Therefore, it can be understood that the present invention is not limited only to the forms mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the appended claims. Also, the present invention should be understood to include all modifications, equivalents, and alternatives within the spirit and scope of the present invention defined by the appended claims.

Explanation of Reference Numerals

[0054] 100: Syringe 110: Barrel 111: Barrel body 113: Connection end 113a: Inner tube 113b: Outer tube 113c: Chemical solution discharge hole 113d: Nozzle insertion groove 115: Flange 120: Plunger 121: Front pressure plate 122: Coupling shaft 122a: Tip 123: Movement limiting projection 124: Tip detachment prevention projection 125: Rear pressure plate 130: Gasket coupling ring 131: Ring body 132: Shaft insertion hole 133: Front flange 133a: Inclined surface 135: Rear flange 137: Band fitting groove 140: Residual pressure removal gasket 141: Fixed band 143: Tilt deformation cap 145: Tip cap 200: Nozzle A: Chemical solution

Claims

1. A barrel (110) filled with a chemical agent therein and having a chemical liquid discharge hole (113c) formed at one end, a plunger (120) inserted into the barrel (110) and configured such that the chemical liquid is discharged to the chemical liquid discharge hole (113c) while advancing by pressurization, and a coupling shaft (122) protrudes from a front pressurizing plate (121) toward the chemical liquid discharge hole (113c) by a certain length, a gasket coupling ring (130) coupled to the rear end of the coupling shaft (122), a residual pressure removal gasket (140) coupled to the gasket coupling ring (130) so as to cover the coupling shaft (122) in front, and when the pressure applied to the plunger (120) is released, it removes the residual pressure inside and prevents additional leakage of the chemical liquid, and includes, the gasket coupling ring (130) is, coupled to the coupling shaft (122) so as to be separated from the front pressurizing plate (121) of the plunger (120) by a reference distance, and when the plunger (120) advances inside the barrel (110) by pressurization, the coupling shaft (122) pressurizes the inside of the residual pressure removal gasket (140) while advancing so that the front pressurizing plate (121) abuts against the gasket coupling ring (130), the residual pressure removal gasket (140) is, a fixing band (141) fitted to the gasket coupling ring (130) and in close contact with the inner wall surface of the barrel (110), a tip cap (145) covering the tip of the coupling shaft (122), formed with a thickness thinner than that of the fixing band (141) and the tip cap (145), connecting the fixing band (141) and the tip cap (145) in an inclined manner, elastically extending when the plunger (120) is pressurized, moving the tip cap (145) forward together with the coupling shaft (122), contracting to the initial length when the pressurization of the plunger (120) is released, and applying an elastic force so that the plunger (120) retreats by the reference distance, and includes an inclined deformation cap (143), the gasket coupling ring (130) is, a ring body (131) fitted to the coupling shaft (122), a rear flange (135) formed to protrude along the outer peripheral edge so as to be separated from the front pressurizing plate (121) by a reference distance from the rear end of the ring body (131), It is formed to project from the tip of the ring body (131) along the outer peripheral edge at a height lower than that of the rear flange (135), and includes a front flange (133) that forms a band fitting groove (137) into which the fixing band (141) is fitted between the front flange (133) and the rear flange (135). The coupling shaft (122) is provided with a movement restricting projection (123) that projects so as to contact the front flange (133) and restricts the forward movement of the gasket coupling ring (130). The front flange (133) includes an inclined surface (133a) whose outer diameter becomes narrower as it goes from the rear to the front at the end, and supports the inclined deformation cap (143) on the inclined surface (133a) so as to maintain a shape in which the width of the inclined deformation cap (143) becomes narrower towards the tip. The rear flange (135) contacts the inner wall surface of the barrel (110) to block the rearward movement of the chemical solution, and is a syringe capable of removing residual pressure.

2. The tip cap (145) is provided with a length that can expose the tip of the coupling shaft (122) to the outside, The syringe capable of removing residual pressure according to claim 1, further comprising a tip detachment preventing projection (124) provided in a coupling region between the tip cap (145) and the coupling shaft (122) for fixing the position of the tip cap (145).

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