KR102086838B1 - Filter of liquid medicinal for injector - Google Patents

Abstract

The present invention relates to a chemical liquid filter for a syringe including a check valve function, and more particularly, to a chemical liquid filter embedded in a hollow of a needle head inserted into a distal end of a syringe cylinder to filter foreign substances contained in the chemical liquid. The chemical liquid filter may include a filter part formed of a porous material and forming a dome shape; And a check valve portion extending from the bottom of the filter portion, the outer diameter of which is extended to be seated on the tip of the syringe cylinder, and at least one suction passage is formed at the bottom thereof. The liquid is sucked into the cylinder, and when the chemical liquid is discharged, the check valve part is in close contact with the inner circumferential surface of the needle head, and the chemical liquid is filtered through the filter part and then discharged.

Description

Filter filter for syringe with check valve function {Filter of liquid medicinal for injector}

The present invention relates to a chemical liquid filter for a syringe for filtering foreign substances that may be included in the chemical liquid, and more particularly, a check having a structure in which a filter and a check valve are integrally formed to simultaneously perform a filter function and a check valve function. The present invention relates to a chemical liquid filter for a syringe including a valve function.

Usually, a syringe and a needle are used for the method of using the chemical liquid. The material of the chemical liquid container for storing the chemical liquid is harmless to the human body and is not reacted with the chemical liquid. The chemical liquid container is sealed for fear of infection, and glass, synthetic resin or silicone rubber is used in combination.

In addition, the cause of foreign substances in the chemical liquid is mainly caused by the mixing of foreign substances such as rubber fragments generated from glass debris or rubber stopper in the ampoule in the process of releasing the sealing of the chemical liquid container and inhaling the chemical liquid. Since the drug is administered to the patient in a state where it is not identified, the health of the patient is potentially threatened.

Recently, a number of products equipped with a filter that can filter foreign substances contained in the above chemicals have been proposed, but since the hollow of the needle head is narrow, the size of the filter cannot be increased indefinitely. In order to solve the situation, the volume of the needle head was changed by changing the structure.

As set forth in the patent document below, there are many domestic and international technologies for such filters.

However, most filter devices should be provided with a check valve that allows the chemical liquid to be sucked into the syringe cylinder when the chemical liquid is inhaled, and the path where the chemical liquid is sucked when the chemical liquid is discharged and is discharged through the needle through another path.

That is, the prior arts are mostly for a structure capable of appropriately filtering the chemical liquid by a combination of various types of filter and check valve.

However, such a structure inevitably results in a complicated structure because the filter and the check valve are configured as separate devices.

In addition, even if the stability is high by having a structure that is first filtered when the chemical inhalation, and the second filter when discharging the chemical solution, there was a disadvantage inevitably have a much more complicated structure.

If the structure is too complex because it is inserted into the needle head, it is very difficult to manufacture a small size, even if the manufacturing of the nature of most disposable syringes, there is a problem that the manufacturing cost increases significantly.

Republic of Korea Patent No. 10-1713835 (2017.3.2.) "Filter needle" Republic of Korea Patent No. 10-1222881 (2013.1.10.) "Filter needle" Republic of Korea Patent No. 10-1753478 (2017.6.27.) "Injector filter assembly and a syringe having a cell"

The present invention has been made in order to improve the problems according to the prior art of the drug filter for the syringe, specifically, the filter and check valve is formed integrally check valve function that can filter the foreign matter of the drug solution for the syringe while having a simple structure It is to provide a chemical liquid filter for the included syringe.

The present invention for achieving the desired object as described above, the present invention is a chemical liquid filter which is embedded in the hollow of the needle head inserted into the distal end of the syringe cylinder to filter foreign substances contained in the chemical liquid, wherein the chemical liquid filter, A filter unit forming a dome shape and made of a porous material; And a check valve portion extending from the bottom of the filter portion, the outer diameter of which is extended to be seated on the tip of the syringe cylinder, and at least one suction passage is formed at the bottom thereof. When the liquid is sucked into the cylinder and the chemical liquid is discharged, the check valve part may be in close contact with the inner circumferential surface of the needle head, and the chemical liquid may be discharged after being filtered through the filter unit.

Here, the inner circumferential surface of the needle head is formed to extend the inner diameter from the front end to the rear end, the outer diameter of the filter portion is shorter than the minimum inner diameter of the needle head, the maximum outer diameter of the check valve portion is the minimum of the needle head It may be formed longer than the inner diameter and shorter than the maximum inner diameter.

Alternatively, the front end of the inner peripheral surface of the needle head is the same inner diameter, the rear end is formed so that the inner diameter is expanded, the outer diameter of the filter portion is shorter than the inner diameter of the front end of the needle head, the maximum outer diameter of the check valve portion is It may be formed longer than the tip inner diameter of the needle head and shorter than the maximum inner diameter of the rear end.

A tapered contact portion may be formed between the filter portion and the check valve portion, and may be in close contact with a boundary point between the front end portion and the rear end portion of the needle head.

On the other hand, irregularities may be formed on the outer circumferential surface of the filter part to increase the surface area.

According to the present invention having the above configuration, the conventional filter and the check valve can be provided separately to solve the disadvantage of having a complicated structure. That is, by having a structure and a shape in which the filter and the check valve are integrally formed, they have a very simple structure, but the suction of the chemical liquid is made quickly, and foreign substances can be reliably filtered out when the chemical liquid is discharged.

In addition, the manufacturing process and method is very easy to mass production and the manufacturing cost can be significantly lowered, there is an advantage of excellent productivity.

In addition, the simple structure ensures almost no failure and the effectiveness of filtering is reliable.

1 is a perspective view showing a syringe and a needle head equipped with a chemical filter for a syringe including a check valve function according to an embodiment of the present invention
2 is an exploded cross-sectional view of a syringe and a needle head equipped with a chemical liquid filter for a syringe including a check valve function according to the present invention shown in FIG.
FIG. 3 is a perspective view illustrating a chemical liquid filter for a syringe including a check valve function according to an embodiment of the present invention shown in FIG. 2.
Figure 4 is a cross-sectional view showing a chemical filter for syringe with a check valve function according to another embodiment of the present invention shown in FIG.
5 is an exemplary view showing an embodiment of the present invention according to the shape of a needle head
6 is an exemplary view showing another embodiment of the filter unit of the present invention.
7 is an operational state diagram of the present invention

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

For reference, the description with reference to the drawings is for easier understanding of the present invention, and the scope of the present invention is not limited thereto. In the following description of the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

1 is a combined perspective view showing a syringe and a needle head equipped with a chemical filter for a syringe including a check valve function according to an embodiment of the present invention, Figure 2 is a check valve function according to the present invention shown in FIG. The separated cross section of the syringe and needle head with the included chemical liquid filter for syringe is shown.

First, the syringe drug solution filter 100 according to the present invention is a device for filtering foreign substances contained in the drug solution, in the detailed description of the present invention, a syringe equipped with a needle will be described as an embodiment, but the syringe, sap It may be used for the purpose of being mounted on a medical injection device in which a chemical liquid flows, such as a chemical liquid hose, a valve connected to the chemical liquid hose, a multidirectional valve, or the like.

In addition, the injection needle generally referred to as a 'injection needle' includes an injection needle 210 inserted into a human body as shown in FIG. 2, and an injection needle head 200 connected to a rear end of the injection needle 210. The inside of the needle head 200 is provided with a hollow communicating with the hollow of the needle 210 so that the tip 310 of the syringe cylinder 300 is fitted.

In addition, the syringe has a hollow formed therein to form a syringe cylinder 300 for receiving the chemical liquid, and the injection pressure for discharging the chemical liquid and the suction pressure for injecting the chemical liquid is injected into the hollow of the syringe cylinder 300 It is configured to include a plunger 400 in the form of a piston.

At this time, the tip of the syringe cylinder 300 is in communication with the hollow of the syringe cylinder 300, the tip portion 310 is fitted to the needle head 200 is formed protruding.

3, 4, and 5 together with reference to the present invention will be described in detail. 3 is a cutaway perspective view showing a chemical filter for a syringe including a check valve function according to the present invention shown in Figure 2, Figure 4 is a check valve function according to another embodiment of the present invention shown in FIG. It is sectional drawing which shows the chemical liquid filter for syringes, and FIG. 5 is an exemplary figure which shows embodiment of this invention according to the shape of the needle head.

Syringe filter 100 with a check valve function according to the present invention is composed of a filter unit 110 and a check valve unit 120, the filter unit 110 and the check valve unit 120 is integrally Is formed and embedded in the hollow in the needle head 200, the filter portion 110 is directed toward the tip portion (200a) side of the needle head 200 and the check valve portion 120 is the rear end portion (200b) It is embedded to face to the side.

The filter unit 110 is formed in a substantially dome shape and a hollow space is formed therein.

Specifically, the upper end of the filter unit 110 is blocked while having a round shape, but the lower end is an open shape. And it is made of porous material and has a certain thickness.

Therefore, the chemical liquid flows into the lower end of the filter unit 110 and may be filtered out through the upper end and the side, and outflow. At this time, the foreign matter contained in the chemical liquid is left in the internal space of the filter unit 110.

Here, the porous material refers to a material having a large number of pores formed therein, and generally may be made of a synthetic resin or an inorganic material. Because there are many pores inside the material, moisture is absorbed through the pores, and because of the great adhesion by water surface tension, water passes through the narrow gap of the pores. However, foreign matter contained in the water is filtered out.

Specifically, the porous materials include polyolefin resin, polyethylene resin, fluororesin porous plastic, foamed plastic, porous metal, porous ceramic, urethane sponge, EVA sponge, porous teflon, sponge structure, woven plastic net, woven metal net, woven fiber A material in which pores are formed, such as a nonwoven fabric, may be used, and may be manufactured to have some elasticity.

On the other hand, the outer diameter of the filter unit 110 is formed shorter than the inner diameter of the needle head 200 is free to move back and forth inside the needle head 200.

In more detail, the inner circumferential surface of the needle head 200 may be formed so as to extend the inner diameter from the leading end portion 200a to the rear end 200b, in this case than the minimum inner diameter of the needle head 200. The outer diameter of the filter unit 110 may be formed short (in the case of FIGS. 5A and 5B).

Alternatively, the inner circumferential surface of the needle head tip portion 200a may have the same inner diameter, and the inner circumferential surface of the rear end portion 200b may be formed so as to extend the inner diameter thereof. The outer diameter of the filter unit 110 may be formed short (in the case of FIGS. 5C and 5D).

Next, the check valve unit 120 functions to block flow when inhaling the chemical liquid and to open when discharging the chemical liquid, and extends from the lower end of the filter unit 110 to communicate with each other.

At this time, the check valve unit 120 may have a circular hollow tube shape in which an inner diameter is formed, and preferably, the check valve unit 120 may have a shape in which the outer diameter extends toward the lower end thereof. That is, it may have an expanded shape that opens like a trumpet.

And the material of the check valve unit 120 may be any material with elasticity.

For example, the material may be made of a flexible material such as rubber or silicone.

This is a sealing so that the check valve unit 120 is strongly adhered to the inner circumferential surface of the needle head 200 by the discharge pressure of the chemical liquid to block the chemical liquid from leaking through the side of the check valve unit 120. This is to perform a function.

In addition, since the check valve unit 120 is preferably molded in one mold to be integrally formed with the filter unit 110, the material of the check valve unit 120 may also be made of a porous material. If a porous material is used, it can be molded by treating it to have a certain degree of elasticity.

Here, at least one suction passage 121 is formed at the lower end of the check valve unit 120.

The suction passage 121 may be formed along the bottom edge of the check valve unit 120 is spaced apart at regular intervals, may be a through-hole shape or a shape such as a groove open to the bottom by cutting a portion. Can be.

The lower outer diameter of the check valve portion 120 is formed longer than the inner diameter of the tip portion 310 of the syringe cylinder so that the check valve portion 120 is seated on an upper surface of the tip portion 310 of the syringe cylinder. It does not enter into the inside of (310).

On the other hand, as shown in (a), (b) of Figure 5 when the inner diameter is extended from the needle head end portion 200a to the rear end 200b, the maximum outer diameter of the check valve unit 120 May be longer than the minimum inner diameter of the needle head 200 and shorter than the maximum inner diameter of the needle head 200.

Therefore, the check valve unit 120 may be inserted back and forth in the needle head 200 so that the check valve unit 120 may be moved forward and backward, and the needle valve head 200a may be caught by the inner circumferential surface of the needle head 200 even if it moves forward. Will not escape through.

As shown in FIGS. 5C and 5D, the inner diameter of the needle head tip portion 200a is the same, and the inner diameter of the rear end portion 200b is extended, and the check valve portion ( The maximum outer diameter of 120 may be longer than the inner diameter of the needle head tip portion 200a and shorter than the maximum inner diameter of the needle head tip portion 200b.

Therefore, the check valve unit 120 is inserted into the needle head 200 and is capable of moving forward and backward, and even when moving forward, the check valve unit 120 is caught by the inner circumferential surface of the needle head rear end 200b. Will not break through).

As another embodiment of the present invention, as shown in FIG. 4, an adhesion part 130 may be further formed between the filter part 110 and the check valve part 120.

The close contact portion 130 is tapered and is formed to have a smaller inclination angle than the inclination angle of the inner circumferential surface of the needle head 200, so that the close contact portion 130 is scanned when the present invention advances when discharging the chemical liquid. It can be surely adhered to the inclined inner peripheral surface of the needle head 200. That is, a stronger sealing function.

For example, (a) or (b) of FIG. 5 may be in close contact with the inclined inner circumferential surface of the needle head 200 as a wedge, and in the case of FIG. 5 (c) or (d), the scanning It may be in close contact with the inclined inner peripheral surface of the needle head rear end 200b.

For reference, the inclination angle of the close contact portion 130 is preferably smaller than the inclination angle of the check valve unit 120.

6 is an exemplary view showing another embodiment of the filter unit of the present invention.

That is, the outer circumferential surface of the filter unit 110 may have a structure in which the unevenness 111 is formed to increase the surface area.

In other words, since the filtering efficiency is improved as the surface area of the filter unit 110 is wider when discharging the chemical liquid, it is preferable to have a structure that can increase the surface area of the filter unit 110.

In this case, the concave-convex 111 may have various shapes.

For example, as illustrated in FIGS. 6A and 6B, a plurality of peaks 111a and valleys 111b may be formed vertically along the outer circumferential surface of the filter unit 110.

Alternatively, as illustrated in FIG. 6 (c), the hill 111a and the valley 111b may be formed horizontally. For reference, of course, any formation in which irregularities are formed other than the shape illustrated here is possible.

Hereinafter, an operating state of the present invention will be described with reference to FIG. 7.

7 is an operation state diagram of the present invention (a) is a case of inhaling the chemical, (b) is a case of discharging the chemical.

In the case of (a), when the plunger 400 of the syringe cylinder 300 is pulled while inhaling the chemical liquid, the chemical pressure is sucked through the needle 210 while the internal pressure is lowered, and the sucked chemical liquid is the needle head 200. Flows into).

Since the pressure of the chemical liquid introduced into the needle head 200 and the suction pressure inside the head pressurize the filter unit 110, the whole of the present invention including the filter unit 110 and the check valve unit 120 includes: The back of the check valve unit 120 is seated on the upper surface of the syringe cylinder tip 310.

The chemical liquid introduced in this state flows along the outer circumferential surfaces of the filter unit 110 and the check valve unit 120, passes through the suction passage 121, and is sucked into the syringe cylinder 300.

For reference, no inhalation filtering occurs.

In the case of (b), when the plunger 400 of the syringe cylinder 300 is pushed to discharge the chemical liquid, the internal pressure increases and the chemical liquid passes through the syringe cylinder tip 310 to the inside of the needle head 200. Inflow.

Since the introduced chemical liquid is pressurized by the discharge pressure while filling the space inside the filter unit 110 and the check valve unit 120, the whole of the present invention including the filter unit 110 and the check valve unit 120 is advanced. Done.

As the present invention moves forward, the outer circumferential surface of the check valve unit 120 or the close contact portion 130 are stuck while being caught by the inner circumferential surface of the inclined needle head 200 so as to stop moving forward. Naturally, since the check valve unit 120 or the close unit 130 functions as a sealing function, the chemical liquid is blocked from flowing to the side of the check valve unit 120.

Therefore, the chemical liquid is discharged after the foreign matter is filtered through the filter unit 110, and the discharged chemical liquid is discharged through the injection needle 210 to be administered to the patient.

Although the above-described present invention has been described with reference to a preferred embodiment, the present invention is not limited to the above-described embodiment, and a person having ordinary skill in the art to which the present invention pertains through the above embodiments does not depart from the gist of the present invention. Various changes can be made in.

100: syringe chemical filter 110: filter unit
111: unevenness 111a: acid
111b: Goal 120: check valve portion
121: suction passage 130: close contact
200: needle head 200a: needle head tip portion
200b: needle head rear end 210: needle
300: syringe cylinder 310: syringe cylinder tip
400: Plunger

Claims (5)

In the chemical liquid filter which is inserted into the hollow of the needle head fitted to the front end of the syringe cylinder to filter foreign substances contained in the chemical liquid,
The chemical filter,
A filter unit forming a dome shape and made of a porous material;
It extends from the lower end of the filter portion, the outer diameter is formed to be extended to be seated on the front end of the syringe cylinder and inlet shaped like a groove opened downwardly by cutting the through-hole shape or the lower part at one or more predetermined intervals along the lower edge. It comprises a check valve portion is formed;
The lower outer diameter of the check valve portion is longer than the inner diameter of the syringe cylinder tip when the chemical liquid is inhaled, and the lower end of the check valve portion is seated on the upper surface of the syringe cylinder tip and sucked into the syringe cylinder through the suction passage. The chemical liquid filter for a syringe with a check valve function, characterized in that the valve portion is in close contact with the inner peripheral surface of the needle head is discharged after the chemical liquid is filtered through the filter unit. The method of claim 1,
The inner circumferential surface of the needle head is formed such that its inner diameter extends from the front end to the rear end,
The outer diameter of the filter portion is shorter than the minimum inner diameter of the needle head,
The maximum outer diameter of the check valve portion is longer than the minimum inner diameter of the needle head and the chemical liquid filter for a syringe with a check valve function, characterized in that shorter than the maximum inner diameter. The method of claim 1,
The front end portion of the inner peripheral surface of the needle head is the same inner diameter, the rear end is formed so that the inner diameter is expanded,
The outer diameter of the filter portion is shorter than the inner diameter of the distal end of the needle head,
The maximum outer diameter of the check valve portion is longer than the inner diameter of the front end of the needle head and the chemical liquid filter for a syringe with a check valve function, characterized in that shorter than the maximum inner diameter of the rear end. delete The method according to any one of claims 1 to 3,
The outer circumferential surface of the filter unit is a chemical liquid filter for a syringe with a check valve function, characterized in that the irregularities are formed to increase the surface area.

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