KR102569481B1 - A syringe with function of low dead space - Google Patents

Abstract

The present invention relates to a disposable syringe capable of metered injection and maximizing economic efficiency, and relates to a barrel having a connection portion to which a needle is connected to a front side, a push rod inserted into the barrel to receive forward and backward transfer power, and a front side of the push rod. Provided is a syringe having a function of minimizing remaining amount, including a gasket coupled to the side and having a body closely attached to the inner surface of the barrel and an insertion protrusion protruding forward from the body and inserted into the connection part.

Description

Syringe with residual amount minimization function {A SYRINGE WITH FUNCTION OF LOW DEAD SPACE}

The present invention relates to a syringe for injecting a drug into the body, and more particularly, to a disposable syringe capable of metered injection and maximizing economic efficiency.

A commonly used syringe is a syringe needle in which a cylinder for storing a drug solution, a piston-type plunger that is inserted into an opening on one side of the cylinder and inhales the drug into the cylinder or forcibly discharges the drug solution filled in the cylinder to the outside, and an injection needle. It is composed of a drug injection port having a certain length protruding from the front center of the cylinder so that the hub can be inserted and fixed to supply the drug solution of the cylinder to the injection needle through a communication path formed in the center.

In such a syringe, it is common to insert a needle directly into the skin of a patient by connecting an injection needle to a drug solution inlet to inject the drug solution, but if necessary, separate the injection needle and connect the drug solution inlet to another drug solution supply device or a drug solution supply means It is also used when additionally supplying the chemical solution.

Korean Patent Publication No. 10-2004-0101898 discloses a safety syringe of the prior art, and FIG. 1 is an exploded perspective view thereof.

Specifically, there is a cylinder 1 formed in a stepped state with a coupling pipe 2 at the front side having a space inside, and the space inside the cylinder moves forward and backward along the longitudinal direction of the cylinder 1. A push rod 3 is inserted so as to be movable, and a piston ( 4) is coupled, and the needle fixing pipe 5 is detachably coupled from the outside to the coupling pipe 2 formed in the cylinder 1, and the needle fixing pipe is inserted into the patient's skin during use. The needle 6 is fixed, and a needle protection cap 7 is detachably coupled to the injection needle fixing tube 5 to protect the injection needle 6 in a completely wrapped state.

A process of using such a general disposable syringe is described as follows.

Before injection, in a state in which the push rod equipped with the piston is moved rearward, one side of the piston 4 coupled to the push rod 3 in the space in the cylinder 1 is sucked and filled with the injection liquid. In order for the injection liquid to be suctioned and filled into the space in the cylinder 1 above, the user has previously installed the injection needle protection cap 7 protecting the injection needle 5 fixed to the injection needle fixing tube 5. The injection needle (6) is separated from the injection needle fixing tube (5) so that the injection needle (6) is exposed to the outside and the push rod (3) inserted in the space of the cylinder (1) is moved forward by pushing it ( 6) is submerged in the injection liquid filled in the injection liquid container, and then the pusher 3 is pulled backward so that the piston 4 moves backward together with the pusher. When the coupled piston (4) is moved backward by the pull of the push rod (3), suction force is provided to the space in the cylinder (1), so that the injection liquid filled in the injection container is transferred to the injection needle fixing tube (5). ) is sucked through the injection needle (6) fixed to the cylinder (1) and filled in the space in the cylinder (1).

In this state, the user moves the cylinder (1) toward the front of the patient, inserts the needle (6) into the patient's skin, and then pushes the pusher (3) to move the piston (4) provided on the pusher forward. When moving to the side, compression is provided to one side of the piston 4 in the space in the cylinder 1, so that the injection liquid filled in the space in the cylinder 1 escapes the coupling pipe 2 formed in the cylinder 1 while receiving the compression force. The injection solution exiting the coupling tube is continuously injected into the patient's skin through the injection needle 6 fixed to the needle fixing tube 5.

After the syringe is used, the needle protective cap 7, which has been separated, is re-coupled to the needle fixing tube 5 coupled to the coupling tube 2 of the cylinder 1, so that the needle protective cap 7 is injected. The needle (5) can be completely covered and protected, and then discarded.

In such a general disposable syringe, technical improvements related to quantitative acceptance and injection are required. In other words, the process in which the user inserts the needle into the vial, inhales it, fills the injection volume once, pushes it in a certain stroke to remove air, inserts the needle into the body, and then injects the drug. In the process of each push rod operation, a certain amount of redundancy has to be taken into account, so discarded drugs have always existed. Furthermore, since each process is dependent on human senses, the problem is further exacerbated by inaccuracies, and the amount of injection for several times accommodated in a vial is always set sufficiently considering the wasted amount.

However, in a situation where the supply of vaccines is extremely limited in global disaster situations such as the corona pandemic, and rapid securing of vaccines and large-scale vaccination are required, the waste of the remaining amount of the vaccines may lead to national losses.

That is, in modern times, there is a demand for a syringe capable of accurately withdrawing and injecting drugs, which is safe and completely injectable by removing most of the remaining amount.

The present invention has been proposed to solve the above-mentioned problems, and an object of the present invention is to provide a syringe having an improved structure that allows a fixed amount of drug withdrawal and injection, while minimizing or removing the remaining amount after injection.

In addition, an object of the present invention is to provide a syringe that can flexibly respond to various strokes as well as automatic and manual purposes by adapting to various injection environments.

In order to solve the above problems, the present invention provides a barrel 1100 having a connection portion 1120 to which needles are connected to the front side, a push rod 1300 inserted into the barrel and receiving forward and backward transfer power, and the push rod A body 1210 coupled to the front side and in close contact with the inner surface of the barrel and a gasket 1200 having an insertion protrusion 1220 protruding forward of the body 1210 and inserted into the connection portion has a function of minimizing the remaining amount A syringe is provided.

Preferably, the gasket has a shape to form a space between the front inner surface of the barrel and the front part of the body, and the space is compressed as the front part of the body is deformed in the process of inserting the insertion protrusion into the connection part by the forward force of the barrel. When the drug is injected and the forward force of the barrel is released and the front portion of the body is elastically restored, the space is restored to form negative pressure toward the connection portion and prevent the drug from leaking to the outside.

In one embodiment, the gasket has a conical shape on the front side of the body, and an insertion protrusion protrudes from the center side.

In addition, the push rod may have a detachable part 1330 connected to the rod fastening part of the automatic injector to receive forward and backward transfer power of the push rod at the rear side.

As an additional embodiment, the push bar has a plunger portion 1310 that is detachably connected to the detachable portion and disposed on the rear side of the coupling portion with the gasket.

In addition, the detachable part may have a pair of protruding structures protruding so that fastening grooves 1332 are formed symmetrically in the circumferential direction on both sides of the rear side, and a push surface 1331 between the protruding structures.

The push rod has a horizontal connection part 1312 protruding forward and connected to the protruding structure on both sides and a vertical connection part 1313 connected to the pushing surface forward, so that when the horizontal connection part and the vertical connection part are cut, they are separated from the detachable part. It is preferable to provide a space where the push rod of the autoinjector can be connected.

According to the present invention, the remaining amount of drug inevitably generated in a conventional syringe can be minimized, which can contribute to economic and national health.

In addition, according to the concept of the present invention, since the push rod is fastened to the automatic syringe when necessary and automatic injection can be applied, it is easy to switch between the manual syringe and the automatic syringe, and accurate and simple fastening is possible.

In addition, since it has a leakage prevention function when injection is completed along with a function to remove the remaining amount, constant injection is possible and contamination by external leakage can be prevented, so it is hygienic.

In addition, since the type of plunger part can be selected and used by flexibly adapting to the situation, there is an effect that can be adapted to the experiences and environments of various patients and operators.

1 is an exploded perspective view for explaining a safety syringe of the prior art.
Figure 2 is a side cross-sectional view for explaining the syringe having the remaining amount minimizing function of the present invention.
Figure 3 is a perspective view showing a gasket portion of the syringe having a residual amount minimizing function of the present invention.
4 is a perspective view showing a push rod part in a syringe having a residual amount minimizing function according to the present invention.
Figure 5 is a view for explaining the operation of the syringe having a residual amount minimizing function of the present invention.
6 is a view showing a state in which it is used in connection with an autoinjector according to an additional concept of the present invention.

Hereinafter, a syringe having a residual amount minimizing function of a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

However, the embodiments described below are only intended to be described in detail so that those skilled in the art can easily practice the invention, thereby limiting the scope of protection of the present invention. doesn't mean

In the following description, when a part is said to be 'connected' to another part, this includes not only the case where it is directly connected but also the case where it is connected with other parts or devices interposed therebetween. In addition, when a certain part 'includes' a certain component, this means that it may further include other components without excluding other components unless otherwise stated.

The present invention basically has a connection part to which a needle is connected on one side or a front side and a barrel having an opening on the other side or a rear side, a gasket having an insertion protrusion extending forward to be inserted into the connection part to remove the remaining amount during injection, and the gasket Provided is a syringe having a residual amount minimizing function including a push rod to which the front side is coupled.

In the present invention, a disposable syringe for injecting a drug such as a vaccine is described, but the type of drug accommodated in the syringe, the shape of the syringe, the method of use, and the use of the syringe do not limit the present invention.

Figure 2 is a side cross-sectional view for explaining the syringe having the remaining amount minimizing function of the present invention.

In the description of the present invention, the direction in which the connecting portion 1120 is disposed in the overall length direction of the disposable syringe 1000 is one side or forward, and the opening is formed to change the direction opposite to the connecting portion 1120 to the other side or rear let it use

The disposable syringe 1000 includes a barrel 1100 forming an accommodation space 1001 for accommodating drugs therein, a push rod 1300 that is inserted into the barrel 1100 and moves a piston to one side when an external force operates, It is coupled to the front end of the push rod 1300 and includes a gasket 1200 that pushes the internal drug toward the connecting portion 1120, which may be common to a conventional syringe for vaccine.

The barrel 1100 is configured with a connection part 1120 to which a needle (not shown) can be mounted at one end, and the connection part 1120 has a connection space 1002 therein and an accommodation space in an area overlapping with the needle ( 1001) to deliver the drug. The needle mounting method and shape of the connecting portion 1120 are not limited to the illustrated embodiment.

An opening is formed at the rear side of the barrel 1100, and an external force can act on the push stick 1300 from the rear side for drug delivery to the front side. Accordingly, the push rod 1300 inserted into the opening side is connected to the front gasket 1200 to push the drug into the accommodation space 1001 and seal it so that it does not leak to the rear side, and is coupled to the operating member of the automatic injector at the rear side to provide power. be provided The coupling relationship with the automatic injector will be described later. The barrel 1100 and the push rod 1300 may be made of a synthetic resin material in consideration of moldability and economic feasibility, and known technologies related to the disposable syringe may be applied to the material in the configurations of the present invention.

The gasket 1200 having a predetermined insertion groove (reference number not indicated) is formed on the rear side of the push rod 1300 so that the insertion protrusion formed in the front side can be inserted, and seals the accommodation space 1001 backward. The gasket 1200 is made of a material having a predetermined flexibility and has a shape capable of sealing by being in close contact with the inner wall surface of the barrel 1100 at the outer periphery. The front end of the gasket 1200 is inserted into the connection space 1002 to perform a function of minimizing the remaining amount after injection (LDS: Low Dead Space). A detailed structure of the gasket 1200 will be described below in more detail.

Figure 3 is a perspective view showing a gasket portion of the syringe having a residual amount minimizing function of the present invention.

The gasket 1200 may be made of a material having a certain degree of flexibility and sealability as a whole, and may be largely divided into a body 1210 and an insertion protrusion 1220.

The body 1210 has a cylindrical shape substantially corresponding to the inner circumference of the barrel 1100, and one or more ring shapes protrude from the outer circumference to form a sealing portion 1211 that rubs against the inner circumferential surface of the barrel 1100. . A cylindrical insertion protrusion 1220 extending forward is formed on the front center side of the body 1210, and the diameter of the insertion protrusion 1220 may correspond to the inner diameter of the connection space 1002, and is substantially inserted into the insertion protrusion 1220. Considering the frictional force and tolerance, etc., it is preferable that the diameter of the insertion protrusion 1220 is slightly smaller than the inner diameter of the connection space 1002. In addition, the length of the insertion protrusion 1220 may substantially correspond to the length of the connecting portion 1120.

In a typical disposable syringe, one end side of the gasket 1200 is formed in a conical shape, and the front inner surface of the barrel 1100 in close contact with it is formed in an inclined shape corresponding to the surface of the gasket 1200.

Referring to FIG. 2 , in the embodiment of the present invention, the front inner surface of the barrel 1100 where the connecting portion 1120 is disposed has a flat plate shape perpendicular to the longitudinal direction. The front side of the gasket 1200 where the insertion protrusion 1220 extends has a conical shape so that the center protrudes more forward, and the shape does not correspond to the front inner surface of the barrel 1100. This temporarily provides negative pressure to the needle side upon completion of injection and functions to prevent leakage of residual drug, which will be described later in the description of the use state to be described later.

Due to the shape of the gasket 1200 of the present invention as described above, the problem of drug remaining in the connection part 1120 and being wasted is basically solved, and the maximum drug capacity can be secured from the limited capacity of the vial. Therefore, it should be noted that it is economical and efficient because more population can be vaccinated from the point of view of health.

As described above, note that the disposable syringe 1000 of the present invention functions as a minimal residual syringe (LDS) and at the same time performs a dual function of preventing leakage of the minimum residual amount by temporarily aspirating when the injection is completed.

4 is a perspective view showing a push rod part in a syringe having a residual amount minimizing function according to the present invention.

The push bar 1300 couples the gasket 1200 to the front of the plunger portion 1310 supporting the overall shape. To this end, the insertion portion 1320 protruding forward of the plunger portion 1310 is inserted into and caught in the insertion groove of the gasket 1200 to prevent the gasket 1200 from being separated when moving forward and/or backward.

The plunger part 1310 may have a cylindrical shape as a whole, but may be formed in a form in which a plurality of ribs are connected in consideration of space and productivity. The plunger part 1310 is enough to perform a function of transferring an external force applied from the rear side to the gasket 1200 on the front side, and the shape and size are optional. The length of the plunger part 1310 can be made in consideration of the length and operating stroke of the barrel 1100. As will be described later, the connection relationship with the operating member of the automatic injector and the detachable part also determines the length. can be an element.

On the other hand, the rear end of the plunger part 1310 may be composed of a push part (not shown) that contacts a finger like a general disposable syringe, but a structure coupled with an automatic injector for precise and rapid operation control may be adopted. Accordingly, a detachable part 1330 for coupling with the operating member may be formed at the rear end of the plunger part 1310.

As one embodiment, the detachable part 1330 is symmetrically in the circumferential direction, in a form in which a pair of projections formed in the radial direction of the rod fastening part of the automatic injector to be described later can be inserted and rotated 90 ° to be fastened. can be configured.

Figure 5 is a view for explaining the operation of the syringe having a residual amount minimizing function of the present invention.

As described above, the push rod 1300 may be disposed inside the barrel 1100 with the gasket 1200 coupled to the front end.

In this embodiment, the rear end of the push rod 1300 is coupled to the rod fastening unit 2210 of the automatic injector so that forward and backward power can be provided. In addition, the flange portion 1130 of the barrel 1100 may be inserted into a predetermined adapter 2100 groove coupled to the autoinjector and fastened in a rotational manner to fix the position.

When the push rod of the automatic injector moves forward according to the fastening force with the rod fastening part 2210, the push rod 1300 pushes the gasket 1200 and the drug contained in the accommodation space 1001 is discharged through the connecting part 1120. . An injection element such as a predetermined needle may be applied to the connecting portion 1120, and a detailed description thereof will be omitted.

5(a) shows a state in which the push rod 1300 is disposed at a predetermined injection start position and the drug is accommodated in the accommodation space 1001.

In this state, when the drug is stored in the pre-injection stage and the needle coupled to the connection part 1120 is inserted into the human body to prepare for injection, the push rod of the automatic injector pushes the gasket 1200 forward while transporting.

As the gasket 1200 moves forward, the drug in the accommodation space 1001 is exhausted, and the insertion protrusion 1220 starts to enter the connection space 1002.

5(b) is a diagram schematically illustrating a state in which injection is completed.

As shown, in a state where the insertion protrusion 1220 completely enters the inside of the connection part 1120, most of the drug inside the barrel 1100 is injected through the needle.

However, some drugs may remain in the connection between the needle and the connection part 1120 and inside the needle, and these remaining parts may cause inaccurate injection, and leakage to the outside when the needle is removed from the body may occur. can

In the present invention, the shape of the front inner surface of the barrel 1100 and the body 1210 of the gasket 1200 is controlled to perform a predetermined aspiration function.

In the illustrated state, when pressure applied by hand or forward force of the push rod is added, the front portion of the body 1210 is deformed and adhered to the front inner surface of the barrel 1100, thereby compressing the front outer circumferential space. Accordingly, the drug remaining on the outer periphery of the front can be injected through the gap between the insertion protrusion 1220 and the inner circumferential surface of the connecting portion 1120. When this forward force is released, the elastic restoring force of the body 1210 acts to restore the outer circumferential space in the front, and this space provides negative pressure to the connection part 1120 and aspirates so that the drug remaining on the nozzle side does not leak to the outside. is to perform a function.

6 is a view showing a state in which it is used in connection with an autoinjector according to an additional concept of the present invention.

Compared to FIG. 4 , in the additional concept of the present invention, the detachable part 1330 is configured at the rear of the coupling part with the gasket 1200 and the plunger part 1310 is connected to the rear.

The insertion part 1320 is formed at the front end of the detachable part 1330 so that it can be inserted and fastened into the insertion groove of the gasket 1200 as described above, and the length of the detachable part 1330 is coupled with the autoinjector. You will adjust your stroke. Accordingly, the length of the detachable part 1330 itself may be adjustable.

As a detailed description of the detachable part 1330, it has a pair of protruding structures in which fastening grooves 1332 are formed symmetrically in the circumferential direction by protruding on both sides. The connection between the pair of protruding structures and the rod fastening part 2210 is as described above. The space between these protruding structures can function as a connection space with the plunger part 1310 as well as a fastening space for the rod fastening part 2210 . The rear surface of the detachable part 1330 is a push surface 1331 and can perform a function of receiving a forward feed force when coupled with a push rod of an automatic injector.

The plunger part 1310 is arranged in a line facing the detachable part 1330, and has a structure connected between the detachable part 1330 and the plunger part 1310. To this end, an extension portion 1311 protrudes forward at the front end of the plunger portion 1310, and a pair of protrusion structures on both sides from the extension portion 1311 are connected with a horizontal connection portion 1312. In addition, a vertical connection part 1313 is connected to the push surface 1331 from the front end side of the extension part 1311.

According to this structure, when used as a manual syringe, the transfer force pushed or pulled by hand in the state in which the plunger part 1310 and the detachable part 1330 are connected is transmitted to the detachable part 1330 through the connection parts, and the plunger when used as an automatic syringe The part 1310 is removed from the detachable part 1330 and the rod fastening part 2210 is fastened to the detachable part 1330 to receive the transfer power of the push rod.

When functioning as a manual syringe, the forward and backward force of the plunger part 1310 is mainly supported by the vertical connection part 1313, and resistance when the plunger part 1310 is rotated can be provided by the horizontal connection part 1312.

On the other hand, when the plunger part 1310 and the detachable part 1330 are separated, the plunger part 1310 is rotated toward the open side of the protruding structure to break the single vertical connection part 1313, and then the horizontal connection part 1312 twists. It can be completely separated as it is cut off while running.

With the syringe having the function of minimizing residual amount according to the present invention as described above, the residual amount of drug inevitably generated in conventional syringes can be minimized, which is economical and can contribute to national health.

In addition, according to the concept of the present invention, since the push rod is fastened to the automatic syringe when necessary and automatic injection can be applied, it is easy to switch between the manual syringe and the automatic syringe, and accurate and simple fastening is possible.

In addition, since it has a leakage prevention function when injection is completed along with a function to remove the remaining amount, constant injection is possible and contamination by external leakage can be prevented, so it is hygienic.

In the above, the present invention has been described in detail based on examples and accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content described in the claims below.

1000...disposable syringe 1001...receiving space
1002 ... connecting space 1100 ... barrel
1110 ... barrel body 1120 ... connection
1130... flange part 1200... gasket
1210 ... body 1211 ... sealing part
1220... Insert protrusion 1300... Push rod
1310 ... plunger part 1311 ... extension part
1312 ... horizontal joint 1313 ... vertical joint
1320...insertion part 1330...removal part
1331... Push 1332... Fastening groove
2100 ... adapter 2210 ... rod fastening part

Claims (5)

Barrel 1100 having a connection portion 1120 to which the needle is connected to the front side;
A pusher 1300 inserted into the barrel and receiving forward and backward transfer power;
A gasket 1200 having a body 1210 coupled to the front side of the push rod and in close contact with the inner surface of the barrel and an insertion protrusion 1220 protruding forward of the body 1210 and inserted into the connection portion,
The gasket is
It has a shape to form a space between the front inner surface of the barrel and the front part of the body, and the front part of the body is deformed in the process of inserting the insertion protrusion into the connection part by the forward force of the barrel, and the space is compressed to inject the drug, When the forward force of the barrel is released and the front part of the body is elastically restored, the space is restored to form a negative pressure toward the connection part and has a function of minimizing the residual amount to prevent the drug from leaking to the outside.
According to claim 1,
The gasket is
A syringe with a function of minimizing remaining amount, with the front side of the body formed in a conical shape, and the insertion protrusion protruding from the center side.
According to claim 1,
The pushing,
A syringe having a residual amount minimization function having a detachable part 1330 connected to the rod fastening part of the automatic injector at the rear side and receiving forward and backward transfer power of the push rod.
According to claim 3,
The pushing,
A syringe having a residual amount minimizing function, including a detachable portion disposed at a rear side of a coupling portion with a gasket and a plunger portion 1310 detachably connected to the detachable portion.
According to claim 4,
The detachable part,
A pair of protruding structures protruding from both sides of the rear side so that fastening grooves 1332 are formed symmetrically in the circumferential direction, and a pushing surface 1331 between the protruding structures,
The pushing,
It has a horizontal connection part 1312 protruding forward and connected to the protruding structure on both sides and a vertical connection part 1313 connected to the pushing surface forward, so that when the horizontal connection part and the vertical connection part are cut, they are separated from the detachable part and push the automatic injector. A syringe with a function of minimizing remaining amount to prepare a space for connecting a rod.

Images