WO2019235830A1

WO2019235830A1 - Device for filtering chemical liquid for syringe

Info

Publication number: WO2019235830A1
Application number: PCT/KR2019/006763
Authority: WO
Inventors: 임성구
Original assignee: Im Sung Ku
Priority date: 2018-06-05
Filing date: 2019-06-04
Publication date: 2019-12-12

Abstract

The present invention relates to a device for filtering a chemical liquid for a syringe and specifically to a device for filtering a chemical liquid for a syringe, comprising: a syringe cylinder having a syringe cylinder head formed on the front end part thereof; a syringe needle head to which the syringe cylinder head is inserted; and a chemical liquid filter which is inserted to the hollow of the syringe needle head, for filtering a foreign material included in the chemical liquid, wherein the chemical liquid filter comprises a dome-shaped filter part made of a porous material, and a check valve part which is formed so that the outer diameter expands from the lower end of the filter part, and which is seated on the syringe cylinder head, and, when the chemical liquid is sucked in, the chemical liquid is sucked in between the inner circumferential surface of the syringe needle head and the check valve part, and, when the chemical liquid is discharged, the chemical liquid is discharged after being filtered via the filter part as the check valve part comes into a close contact with the inner circumferential surface of the syringe needle head.

Description

Syringe filtering device for syringe

The present invention relates to a chemical liquid filtering device for a syringe for filtering foreign substances that may be included in the chemical liquid, and more particularly, a filter and a check valve are integrally formed to have a filter function and a check valve function. The present invention relates to a drug filtering device for a syringe.

Typically, syringes and injection needles are used to use chemicals.

Therefore, the material of the chemical container that stores the chemical liquid is made of a composite material of glass, synthetic resin or silicone rubber, etc. to be harmless to the human body and not to react with the chemical liquid, and is sealed in fear of infection.

The reason that the foreign chemicals are included in the chemical liquid is mainly because foreign substances such as glass fragments generated from the ampoules or rubber fragments generated from the rubber stopper are mixed in the chemical liquid during the sealing of the chemical liquid container and the suction of the chemical liquid. And because the drug is administered to the patient in the state that the foreign matter is not visually 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. However, since the internal space of the needle head is narrow, the size of the filter cannot be increased indefinitely. To solve this problem, the volume of the needle head is changed by changing the structure of the needle head.

Techniques for such a filter are disclosed in a number of domestic and international as set forth in the patent document below.

However, most filter devices allow the chemical to be sucked into the syringe cylinder when the chemical is sucked, but when the chemical is discharged, a check valve may be provided to block the path where the chemical is sucked and to discharge the needle through the other 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 causes a complicated structure because the filter and the check valve must be provided 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 has a disadvantage that it has a much more complicated structure.

Therefore, if the structure is too complicated 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.

The present invention has been made in order to improve the above-mentioned problems, it is made of a simple structure in which the filter and the check valve is integrated by forming a porous material, so that the foreign matter can be filtered by blocking when passing through and inhaling the chemical liquid It is to provide a chemical liquid filtering device for a syringe using a porous filter having an in check valve function.

It is another object of the present invention to provide a chemical liquid filtering device for a syringe which can block foreign substances from being introduced into the needle by fast moving the porous filter in front of the needle head to be firmly adhered and fixed.

The present invention for achieving the above object, the syringe cylinder head is formed in the tip of the syringe cylinder, the injection needle head and the needle head is inserted into the hollow of the needle head is inserted in the hollow of the needle head foreign matter contained in the chemical liquid A chemical liquid filtering device for a syringe comprising a chemical liquid filter for filtering, wherein the chemical liquid filter comprises: a filter part forming a dome shape and made of a porous material; And a check valve portion formed to extend an outer diameter from a lower end of the filter portion and seated on the syringe cylinder head, wherein the check valve portion is sucked between the inner circumferential surface of the needle head and the check valve portion when the chemical liquid is sucked, and when the chemical liquid is discharged. While the check valve part is in close contact with the inner circumferential surface of the needle head, the chemical liquid is filtered through the filter part and then discharged.

Here, at least one suction passage is formed at a lower end of the check valve unit, and when the chemical liquid is inhaled, the suction cylinder is sucked into the syringe cylinder. When the chemical liquid is discharged, the check valve unit is in close contact with the inner circumferential surface of the needle head. It is discharged after being filtered through the filter part.

And between the syringe cylinder head and the chemical filter is provided with an elastic member for elastically supporting the chemical filter, the elastic member is compressed during suction of the chemical liquid is sucked between the inner circumferential surface of the needle head and the check valve portion, Release As the elastic member is restored and the check valve part is in close contact with the inner circumferential surface of the needle head, the chemical liquid is filtered through the filter part and then discharged.

In addition, a first magnetic body is attached to a lower surface of the check valve part, and a second magnetic body having the same polarity as that of the first magnetic body is formed on the inner circumferential surface of the needle head, so that the liquid is sucked between the inner circumferential surface of the needle head and the check valve part. When the chemical liquid is discharged, the check valve part is in close contact with the inner circumferential surface of the needle head by the repulsive force between the first and second magnetic bodies, and the chemical liquid is filtered through the filter part and then discharged.

In addition, between the syringe cylinder head and the chemical filter is provided with a funnel-shaped auxiliary filter in which one side is embedded in the chemical filter and the other side is in close contact with the inner circumferential surface of the needle head, the check with the inner peripheral surface of the needle head when inhaling the chemical The filter is primarily filtered by the auxiliary filter while being sucked between the valve parts, 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 auxiliary filter and the filter part and then discharged.

Another embodiment of the present invention for achieving the above object, the syringe cylinder head is formed in the tip of the syringe cylinder, the needle head is inserted into the syringe cylinder head and the hollow of the needle head is inserted into the chemical liquid A chemical liquid filtering device for a syringe including a chemical liquid filter for filtering foreign substances, the chemical liquid filter comprising: a main body portion having a dome or a conical shape and having at least one suction passage formed on an outer circumferential surface thereof; Filter paper attached to the suction passage; It is formed so as to extend the outer diameter from the lower end of the main body portion is a check valve portion which is seated on the syringe cylinder head, including, but is sucked between the inner circumferential surface of the needle head and the check valve portion when the chemical liquid intake, and the check valve when the chemical liquid is discharged The chemical liquid is discharged after being filtered through the suction passage while being in close contact with the inner circumferential surface of the needle head.

Alternatively, a syringe cylinder including a syringe cylinder having a syringe cylinder head formed at its tip, a needle head into which the syringe cylinder head is fitted, and a chemical liquid filter embedded in the hollow of the needle head to filter foreign substances contained in the chemical liquid. A chemical liquid filtering device, wherein the chemical liquid filter comprises: a main body part formed of a dome or a cone shape and having at least one suction passage formed on an outer circumferential surface thereof; Filter paper attached to the suction passage; A check valve portion formed at a lower end of the main body portion than an outer diameter of the main body portion and seated on a syringe cylinder head, wherein the suction liquid is sucked between the inner circumferential surface of the needle head and the check valve portion, and the chemical liquid During discharge, the check valve part is in close contact with the inner circumferential surface of the needle head and is discharged after filtering the chemical liquid through the suction passage.

According to the present invention having the above configuration, the filter and the check valve are conventionally provided to solve the problem of complicated structure.

That is, the filter and the check valve are molded using a porous material to have an integrated structure and shape, but 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. There is little and the filtering effect is reliable.

In addition, the manufacturing process and method is very easy, mass production is possible, and the manufacturing cost can be significantly lowered.

In addition, since it consists of ribs, collars, spiral protrusions, and stepped structures, the syringe cylinder head can be inserted into the needle head in two stages, so that the position of the chemical liquid filter can be fixed and completely adhered to the inner circumferential surface of the needle head. Because of this, perfect filtering is possible.

In addition, since the chemical filter is elastically supported using an elastic member or a magnetic material, the check valve part is completely intimately adhered to the needle head after inhalation of the chemical liquid, and thus there is no danger of foreign substances being injected into the patient during the chemical liquid discharge. In other words, perfect filtering is possible.

1 is a perspective view showing a syringe equipped with a chemical liquid filtering device for a syringe according to an embodiment of the present invention

Figure 2 is an exploded cross-sectional view of the drug solution filtering device for a syringe according to the present invention shown in Figure 1

Figure 3 is a perspective view of the cutaway showing the structure of the chemical liquid filter of the present invention shown in FIG.

4 is a cross-sectional view of the chemical liquid filter of the present invention shown in FIG.

5 is an operating state diagram of the present invention shown in FIG.

Figure 6 is an exploded cross-sectional view of the drug solution filtering device for a syringe according to another embodiment of the present invention

FIG. 7 is a cutaway perspective view of a portion of the chemical liquid filter of the present invention shown in FIG. 6. FIG.

8 is a cross-sectional view showing the assembled state of the chemical liquid filter of the present invention shown in FIG.

9 is a cross-sectional view showing another assembled state of FIG.

10 is an exemplary view showing a type of elastic member of the present invention shown in FIG.

11 is an exemplary view showing various examples of the locking step and the locking groove of the present invention

12 is an operating state diagram of the present invention shown in FIG.

13 is a sectional view showing another embodiment of the present invention

14 is a cross-sectional view showing another embodiment of the present invention

15 and 16 are exemplary views showing various embodiments of the present invention according to the shape of the needle head.

17 is a cross-sectional view showing a drug liquid filtering device for a syringe according to another embodiment of the present invention

18 is an operating state diagram of the present invention shown in FIG.

19 is a cross-sectional view showing a drug liquid filtering device for a syringe according to another embodiment of the present invention

20 is an operating state diagram of the present invention shown in FIG.

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

Figure 22 is an exploded cross-sectional view of a drug liquid filtering device for a syringe according to another embodiment of the present invention

23 to 25 are perspective views showing an embodiment of the chemical liquid filter of the present invention shown in FIG.

FIG. 26 is a cross-sectional view illustrating an assembled state of the chemical liquid filter of the present invention illustrated in FIG. 22.

27 is a cross-sectional view showing another assembled state of FIG.

28 is an exemplary view showing various embodiments of the present invention according to the shape of a needle head.

29 is a cross-sectional view showing another embodiment of the present invention.

30 is a cross-sectional view showing still another embodiment of the present invention

31 is an operating state diagram of the present invention shown in FIG.

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 perspective view showing a syringe equipped with a chemical liquid filtering device for a syringe according to an embodiment of the present invention, Figure 2 is an exploded cross-sectional view of the chemical liquid filtering device for a syringe according to the present invention shown in FIG.

First, the drug solution filtering device for a syringe according to the present invention is a device for filtering foreign substances contained in the drug solution, in the specific description of the present invention, a syringe provided with an injection needle will be described as an embodiment, but not only a syringe but also a fluid injection medicine It may be used for the purpose of being mounted on a medical injection device in which a chemical liquid flows, such as a hose or a valve connected to the chemical liquid hose, a multidirectional valve, or the like.

In addition, the injection needle generally 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 200 is inserted into the syringe cylinder head 310 of the hollow shape in communication with the hollow of the needle 210.

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

At this time, the syringe cylinder head 310 which is in communication with the hollow of the syringe cylinder 300, and fitted to the needle head 200 is protruded to the front end of the syringe cylinder 300.

The present invention will be described in detail with reference to FIGS. 3 and 4. 3 is a cutaway perspective view showing the structure of the chemical liquid filter of the present invention shown in Figure 2, Figure 4 is a cross-sectional view of the chemical liquid filter of the present invention shown in FIG.

The drug solution filtering device for a syringe according to the present invention comprises a syringe cylinder 300, a needle head 200, and a chemical solution filter 100.

Since the syringe cylinder 300 and the needle head 200 are as described above, a detailed description thereof will be omitted and the chemical liquid filter 100 will be described in detail.

The chemical liquid filter 100 of the present invention is composed of a filter unit 110 and the check valve unit 120, the filter unit 110 and the check valve unit 120 is formed integrally and the needle head 200 It is embedded in the hollow inside).

In this case, the filter unit 110 is directed toward the front end 200a of the needle head 200 and the check valve unit 120 is directed toward the rear end 200b.

First, the filter unit 110 is formed in a substantially dome shape and a hollow space is formed therein.

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

Therefore, the chemical liquid flows into the open lower portion of the filter unit 110 and may be filtered out through the upper side and the side portion and flow out to the outside. At this time, 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. Due to the large number of pores inside the material, moisture is absorbed through the pores, and because of the great adhesion by the surface tension of the water, the water passes through the narrow gap of the pores. However, foreign matter contained in moisture 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 fabric Materials in which pores are formed, such as fibers, nonwoven fabrics, filter papers, can be used, can be used alone or in combination, and can be manufactured to have some elasticity.

Next, the check valve unit 120 functions to open the flow upon inhalation of the chemical liquid and to block the flow upon dispensing, extending from the lower portion of the filter unit 110 and communicating with each other.

At this time, the check valve unit 120 may have a circular hollow shape in which the inner diameter is formed.

Preferably, the outer diameter of the check valve unit 120 may be formed in a shape that extends toward the lower end. 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 portion 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 surface of the check valve portion 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.

Therefore, when the chemical liquid is sucked into the needle 210, the chemical liquid filter 100 is reversed because of negative pressure, so the chemical liquid is formed through a gap formed between the inner circumferential surface of the needle head 200 and the check valve unit 120. Suction is introduced into the syringe cylinder 300.

On the contrary, since the chemical liquid filter 100 is advanced due to positive pressure when the chemical liquid is discharged, the chemical liquid is filtered through the filter unit 110 while the check valve unit 120 is in close contact with the inner circumferential surface of the needle head 200. It is discharged to the needle 210.

Here, at least one suction passage 121 may be formed at a 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 spaced apart at regular intervals, may be a through-hole shape or a shape such as a groove opened downward by cutting a portion. Can be.

Referring to the operation of the chemical filter 100 in which the suction passage 121 is formed, when the chemical liquid is sucked into the needle 210, the chemical filter 100 is reversed because of the negative pressure, so the chemical liquid is the needle head 200 After being sucked through the gap formed between the inner circumferential surface of the and the check valve unit 120 is introduced into the syringe cylinder 300 through the suction passage.

On the contrary, since the chemical liquid filter 100 is advanced due to positive pressure when the chemical liquid is discharged, the chemical liquid is filtered through the filter unit 110 while the check valve unit 120 is in close contact with the inner circumferential surface of the needle head 200. It is discharged to the needle 210. That is, since the suction passage 121 is formed, the suction of the chemical liquid can be made smoothly.

Hereinafter, an operating state of the present invention will be described with reference to FIG. 5.

Figure 5 is an operating state diagram of the present invention shown in Figure 2, where (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 when inhaling the chemical liquid, the chemical pressure is sucked through the needle 210 while the internal pressure is lowered, and the suctioned 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 reverse side of the check valve unit 120 is seated on the upper surface of the syringe cylinder head (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. At this time, no filtering occurs during inhalation.

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 head 310 into 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 chemical liquid filter including the filter unit 110 and the check valve unit 120 is advanced. do.

As the chemical filter 100 is advanced, the outer circumferential surface of the check valve unit 120 or the close contact portion 130 is stuck to the inner circumferential surface of the inclined needle head 200 so that the chemical filter 100 is not moved forward and stops. Naturally, the check valve unit 120 or the close unit 130 blocks the flow of the chemical liquid to the side of the check valve unit 120 because it functions as a sealing function.

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.

6 to 11, another embodiment of the chemical filter will be described. 6 is an exploded cross-sectional view of a chemical liquid filtering device for a syringe according to another embodiment of the present invention, Figure 7 is a cutaway perspective view of a portion of the chemical liquid filter of the present invention shown in Figure 6, Figure 8 is shown in Figure 7 FIG. 9 is a cross-sectional view showing another assembled state of FIG. 8, FIG. 10 is an exemplary view showing a kind of elastic member of the present invention, and FIG. 11 is a present invention. Figure is an exemplary view showing various examples of the locking step and the locking groove.

Another embodiment of the present invention is a structure in which the elastic member 140 is further provided between the syringe cylinder head 310 and the chemical filter 100.

One end of the elastic member 140 is seated on the syringe cylinder head 310 and the other end is seated on the bottom surface of the check valve unit 120 of the chemical filter 100. Therefore, since the chemical filter 100 is elastically supported by the elastic member 140, the check valve unit 120 may be more firmly attached to the inner circumferential surface of the needle head 200.

Here, the elastic member 140 may use a spring.

Specifically, the type of spring that can be used as the elastic member 140 is a compressive coil spring (comprehensive coil spring), leaf spring (leaf spring), volute spring (volute spring), circular spring (ring spring), dish spring ( Various springs can be used, such as disc springs, washer springs, snap springs, snap springs, wire springs, silicon springs, and bellows-type springs (see FIG. 10).

In this case, the locking jaw 240 may be formed in the needle head 200 as shown in FIG. 6 or 8 so that the elastic member 140 is not separated from the needle head 200.

The locking step 240 may have a structure in which stepped protrusions protruding along the inner circumferential surface of the needle head 200 are continuously formed, or a plurality thereof is formed at predetermined intervals.

And the protruding jaw 122 is formed on the lower surface of the check valve unit 120. The protruding jaw 122 may also have a continuous circular structure or a plurality of structures arranged in a circle at regular intervals.

Accordingly, one end of the elastic member 140 is seated while being caught by the locking jaw 240, and the other end is seated on the lower surface of the check valve unit 120. In this case, the protruding jaw 122 may be inserted into the elastic member 140.

The cross section of the locking jaw 240 may be formed in a quadrangle, triangle, semicircle, or the like as shown in FIG.

In addition, unlike the locking step 240 on the inner circumferential surface of the needle head 200 may be a structure in which a groove-shaped locking groove 250 is formed.

The locking groove 250 may have a groove shape so that one end of the elastic member 140 may be inserted, and may have a structure continuously formed along the inner circumferential surface of the needle head 200.

Therefore, the edge of one end of the elastic member 140 is inserted into the engaging groove 250 as shown in the drawing so as not to be separated.

At this time, as shown in Figure 11 (b) of the cross-sectional view of the locking groove 250 may be made of a square, triangle, semi-circular.

Importantly, the elastic modulus of the elastic member 140 may be appropriately adjusted so that the chemical filter 100 may be reversed while the elastic member 140 is compressed by the pressure during chemical suction.

Preferably, a separate support ring 141 is coupled to the lower end of the elastic member 140 to be stably seated on the locking step 240. To this end, the outer diameter of the support ring 141 may be formed to be similar to the inner diameter of the needle head 200 to prevent the elastic member 140 from moving on the locking step 240.

Alternatively, the support ring 141 may be stably inserted into the engaging groove 250. For this purpose, the outer diameter of the support ring 141 is larger than the inner diameter of the needle head 200 so that the elastic member is provided. 140 may be fitted on the locking groove 250 to prevent movement. Therefore, the elastic member 140 can be prevented from leaving in position.

12 is an operating state diagram of the present invention shown in FIG. Here, (a) is a case where a chemical liquid is inhaled, and (b) shows a case where a chemical liquid is discharged.

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: Reverse

At this time, since the chemical filter 100 is reversed, the elastic member 140 is compressed.

In this state, the chemical liquid flows between the check valve unit 120 and the inner circumferential surface of the needle head 200, and the introduced chemical liquid is sucked into the syringe cylinder 300. At this time, no filtering occurs during inhalation.

When the suction is completed, the compressed elastic member 140 is restored again, and the check valve unit 120 contacts the inner circumferential surface of the needle head 200.

In the case of (b) for discharging the chemical liquid, when the plunger 400 of the syringe cylinder 300 is pushed, the internal pressure is increased and the chemical liquid is injected into the needle head 200 through the syringe cylinder head 310. Flows into.

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 check valve unit 120 is further in close contact with the inner circumferential surface of the needle head 200. .

Naturally, since the check valve part 120 functions as a sealing function, the chemical liquid blocks the flow between the check valve part 120 and the inner circumferential surface of the needle head 200.

Another embodiment of the present invention is the same as FIG. 13 or FIG. 14. 13 is a cross-sectional view showing still another embodiment of the present invention, and FIG. 14 is a cross-sectional view showing still another embodiment of the present invention.

As shown in FIG. 13, in the present invention, the first magnetic body 151 is attached to the lower surface of the check valve part 120 to add the same elastic force as the elastic member 140, and the needle head 200 is provided. The inner circumferential surface of) may have a structure in which the second magnetic body 152 is formed to protrude.

Here, the polarity of the first magnetic body 151 and the second magnetic body 152 is provided to have the same repulsive force. Therefore, the chemical filter 100 may be further in close contact with the inner circumferential surface of the needle head 200 by the pushing force, such as elastic force.

In addition, it is natural that the chemical liquid filter 100 should be set so as to retreat to the pressure when the chemical liquid is inhaled by appropriately adjusting the magnetic force of the first and second

magnetic bodies

151 and 152.

In addition, as shown in FIG. 14, an auxiliary filter 160 may be further inserted between the syringe cylinder head 310 and the chemical liquid filter 100.

The auxiliary filter 160 may be inserted into a hollow shape of the chemical filter 100, and the other side may have a conical shape, and the other side may be in close contact with the inner circumferential surface of the needle head 200. Can be. That is, as shown, it may be made of a substantially funnel shape.

The auxiliary filter 160 may also be made of a material substantially the same as that of the filter unit 110 described above.

The auxiliary filter 160 is a chemical liquid is passed through the narrow tube of the subsidiary filter 160 during the discharge of the chemical liquid and the flow rate is increased and the chemical liquid filter 100 is the whole while the raised chemical liquid presses the filter unit 110 While pushing at a higher speed, it may be quickly adhered to the inner circumferential surface of the needle head 200.

For reference, the elastic member 140 may be further provided between the auxiliary filter 160 and the chemical liquid filter 100. That is, one end of the elastic member 140 is supported while one side of the auxiliary filter 160 penetrates, and the other end thereof may be fixed by the protruding jaw 122 formed on the lower surface of the check valve unit 120. .

On the other hand, the outer diameter of the filter unit 110 is formed smaller than the inner diameter of the needle head 200 is free to move forward and backward in the needle head 200, the outer diameter of the lower end of the check valve unit 120 It is formed larger than the inner diameter of the syringe cylinder head 310 so that the check valve 120 is seated on the upper surface of the syringe cylinder head 310 so as not to be drawn into the syringe cylinder head 310.

This will be described in detail with reference to FIGS. 15 and 16. 15 and 16 are exemplary views showing various embodiments of the present invention according to the shape of the needle head.

For example, when the inner circumferential surface of the needle head 200 is formed to extend from the distal end portion 200a to the rear end portion 200b as shown in FIGS. 15A and 15B, the needle The outer diameter of the filter unit 110 is smaller than the minimum inner diameter of the head 200, the maximum outer diameter of the check valve unit 120 is larger than the minimum inner diameter of the needle head 200, and the needle head ( It may be formed smaller than the maximum inner diameter of 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 on the inclined inner circumferential surface of the needle head 200 even when it is moved forward. ) Will not escape.

As another example, as shown in (c) and (d) of FIG. 15, when the inner circumferential surface of the needle head tip portion 200a has the same inner diameter, and the inner circumferential surface of the rear end portion 200b is formed to expand the inner diameter, the The outer diameter of the filter unit 110 is smaller than the inner diameter of the tip portion 200a of the needle head 200, and the maximum outer diameter of the check valve portion 120 is larger than the inner diameter of the needle head tip portion 200a. It may be formed smaller than the maximum inner diameter of the needle head rear end 200b.

Therefore, the check valve unit 120 is inserted into the needle head 200 and can be moved forward and backward, and the needle is caught by the inner circumferential surface of the rear end portion 200b of the needle head 200 even if it moves forward. It is not separated through the tip portion 200a of the head 200.

As another example, although not shown, the inner diameter of the needle head tip portion 200a is the same, and the inner circumferential surface of the rear end portion 200b has the same inner diameter but larger than the inner diameter of the tip portion 200a, and the tip portion 200a and the inner diameter. When the middle portion 200c formed between the rear end portions 200b has an inner diameter extended, the outer diameter of the filter portion 110 is smaller than the inner diameter of the tip portion 200a of the needle head 200, and the check valve portion The maximum outer diameter of 120 may be larger than the inner diameter of the tip portion 200a of the needle head 200 and smaller than the inner diameter of the rear end portion 200b.

Therefore, the check valve unit 120 may be caught by the intermediate portion 200c.

For another example, as shown in FIG. 16A, when the needle head 200 has an inner diameter that extends from the tip portion 200a to the trailing portion 200b, the maximum of the check valve portion 120 is increased. The outer diameter may be larger than the minimum inner diameter of the needle head 200 and smaller than the maximum inner diameter of the needle head 200.

Therefore, the check valve part 120 is inserted into the needle head 200 and is capable of moving forward and backward, and closes while being caught by the inner circumferential surface of the needle head 200 even if it moves forward.

In addition, when the inner diameter of the tip portion 200a of the needle head 200 is the same as that of FIG. 16B and the inner diameter of the rear end portion 200b is expanded, the maximum outer diameter of the check valve portion 120 is increased. May be larger than the inner diameter of the needle head tip portion 200a and smaller 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 is in close contact with the inner circumferential surface of the rear end portion 200b of the needle head 200 even if it moves forward.

In addition, the inner diameter of the tip portion 200a of the needle head 200 is the same as that of FIG. In the case where the intermediate portion 200c having an inner diameter is formed between the ends 200b, the outer diameter of the filter unit 110 is smaller than the inner diameter of the tip portion 200a of the needle head 200. The maximum outer diameter of the check valve unit 120 may be formed larger than the inner diameter of the front end portion 200a of the injection needle head 200 and smaller than the inner diameter of the rear end portion 200b.

Therefore, the check valve unit 120 is inserted into the needle head 200 and is capable of moving forward and backward, and is in close contact with the inner circumferential surface of the needle head middle part 200b even when it moves forward.

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 17 and 18. 17 is a cross-sectional view showing a drug filtering device for a syringe according to another embodiment of the present invention, Figure 18 is an operating state diagram of the present invention shown in FIG.

Syringe filtering device according to another embodiment of the present invention is to change the structure of the needle head 200 in order to improve the fixing and adhesion of the drug filter 100.

When the chemical liquid is discharged, the chemical liquid filter 100 is advanced by the discharge pressure to be in close contact with the inner circumferential surface of the needle head 200, and when the discharge pressure is not uniform, the chemical liquid filter 100 accurately performs sealing. Difficult cases can arise. In order to prevent such a problem in advance, the structure of the needle head 200 may be changed as shown.

That is, the step 220 may be formed at the boundary between the middle part 200c and the rear end 200b. The step 220 is for allowing the syringe cylinder head 310 inserted into the needle head 200 to be caught without being able to proceed any further.

In addition, one or more ribs 230 may be formed on an inner circumferential surface of the rear end portion 200b of the needle head 200.

The rib 230 protrudes inward from the inner circumferential surface of the rear end portion 200b of the needle head 200 and may protrude in a circular shape along the inner circumferential surface.

In this case, the rib 230 may be divided into a first rib 231 and a second rib 232.

The second rib may protrude more than the first rib 231 and may be formed adjacent to the step 220.

This is to be divided into two stages when inserting the syringe cylinder head 310 to the needle head 200.

That is, the syringe cylinder head 310 is first inserted into the needle head 200 while passing over the first rib 231, but is caught by the second rib 232 and stopped, and the syringe cylinder 300 ), The syringe cylinder head 310 is stopped while being caught by the step 220 after passing through the second rib 232.

Referring to the operation process, as shown in Fig. 18 (a), the user first forcibly inserts the syringe cylinder head 310 to the needle head 200 in which the chemical liquid filter 100 is embedded. At this time, as described above, the syringe cylinder head 310 is inserted into the first rib 231 and inserted into the jammed state without exceeding the second rib 232.

Here, the first rib 231 may be crushed while being compressed.

In this state, when the chemical liquid is inhaled, the chemical liquid is sucked into the needle head 200 and flows into the syringe cylinder 300 through the suction passage 121.

Next, as shown in FIG. 18B, the user pushes the syringe cylinder head 310 further into the needle head 200 so that the syringe cylinder head 310 moves the second rib 232. Ride and push until you are seated on the step 220. In this case, the second rib 232 may also be crushed while being compressed.

At this time, the chemical filter 100 seated on the syringe cylinder head 310 is also pushed forward and the close contact portion 130 or the check valve portion 120 of the chemical filter 100 is the needle head 200 Is completely adhered to and fixed to the inner circumferential surface of the middle part 200c). At this time, the syringe cylinder head 310 is caught by the step 220 to stop.

Thereafter, when the user pushes the plunger 400 of the syringe cylinder 300 to discharge the chemical liquid, the chemical liquid in the syringe cylinder 300 is discharged through the filter unit 110 of the chemical filter 100 and the needle 210 Exit to). At this time, the foreign matter in the chemical liquid is filtered by the filter unit 110.

In summary, the rib 230 and the step 220 secure the syringe cylinder head 310, the needle head 200, and the chemical filter 100 in place so that the filtering may be perfectly performed when the chemical liquid is discharged. do.

Alternatively, an outwardly protruding collar 260 may be formed on an outer circumferential surface of the rear end portion 200b of the needle head 200.

19 is a cross-sectional view showing a drug filtering device for a syringe according to another embodiment of the present invention, Figure 20 is an operating state diagram of the present invention shown in FIG.

One or more collars 260 may be formed. As illustrated, the collars 260 may be formed to face the rear ends of the needle head 200, respectively.

Meanwhile, a cylindrical fastener 320 may be further formed outside the syringe cylinder head 310.

The fastener 320 is formed to surround the syringe cylinder head 310, the spiral protrusion 321 is formed on the inner peripheral surface.

In this case, the inner diameter of the fastener 320 should be equal to or longer than the distance between both ends of the collar 260 so that the needle head 200 can be inserted into the fastener 320.

Accordingly, the collar 260 may be screwed with the spiral protrusion 321. That is, the needle head 200 may be fastened to the fastener 320.

Importantly, when the syringe cylinder head 310 is inserted into the needle head 200, the spiral protrusion 321 may be formed at least two pitches so as to be inserted through two steps.

This is because the collar 260 is coupled to the spiral protrusion 321 by one pitch, and the syringe cylinder head 310 is primarily fitted to the needle head 200, and is fitted secondarily while being pitched two pitches. While being coupled, the syringe cylinder head 310 may be caught and stopped by the step 220.

Referring to the operation process, as shown in Fig. 20 (a), the user first forcibly inserts the syringe cylinder head 310 into the needle head 200 in which the chemical filter 100 is embedded and at the same time The collar 260 is inserted into the fastener 320.

Then, the needle head 200 and the syringe cylinder 300 are rotated opposite to each other to fasten the collar 260 and the spiral protrusion 321 so that only one pitch is screwed.

At this time, the chemical liquid filter 100 is not in close contact with the inner peripheral surface of the needle head 200.

Next, the user rotates the needle head 200 and the syringe cylinder 300 again as shown in FIG. 20 (b) to fasten the collar 260 and the spiral protrusion 321 to be screwed two pitches or more. do.

Then, the syringe cylinder head 310 is advanced, and the chemical liquid filter 100 seated on the syringe cylinder head 310 is also pushed forward, and the close contact portion 130 or the check of the chemical liquid filter 100 The valve unit 120 is completely adhered to and fixed to the inner circumferential surface of the middle part 200c of the needle head 200. At this time, the syringe cylinder head 310 is caught by the step 220 to stop.

Thereafter, when the user pushes the plunger 400 of the syringe cylinder 300 to discharge the chemical liquid, the chemical liquid in the syringe cylinder 300 is discharged through the filter unit 110 of the chemical filter 100 and the injection needle 210 Exit to). At this time, the foreign matter in the chemical liquid is filtered by the filter unit 110.

In summary, the collar 260, the spiral protrusion 321, and the step 220 are fixed at the time of dispensing the chemical liquid by fixing the syringe cylinder head 310, the needle head 200, and the chemical filter 100 in place. This makes it perfect.

In another embodiment of the chemical filter 100, an adhesion part 130 may be further formed between the filter part 110 and the check valve part 120 as illustrated in FIG. 4.

The close contact portion 130 is tapered and 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 in close contact with the inclined inner peripheral surface of the needle head 200. That is, a stronger sealing function.

For example, in the case of (a) or (b) of FIG. 15, the close contact portion () may be in close contact with the inclined inner circumferential surface of the needle head 200 as a wedge, and (c) of FIG. 15. Alternatively, (d) may be in close contact with the inclined inner circumferential surface of the needle head rear end 200b, and may be in close contact with the intermediate part 200c when the middle part 200c is present.

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

In the present invention, the filter unit 110 may have various shapes. 21 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 solution, it is preferable to have a structure capable of increasing 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. 21A and 21B, 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. 21C, the hill 111a and the valley 111b may be formed horizontally. For reference, in addition to the shape illustrated here, of course, any formation with unevenness is possible.

Hereinafter, another embodiment of the present invention will be described in detail.

22 is an exploded cross-sectional view of a chemical liquid filtering device for a syringe according to another embodiment of the present invention, Figures 23 to 25 is a perspective view showing an embodiment of the chemical liquid filter of the present invention shown in Figure 22, Figure 26 is Figure 22 It is sectional drawing which shows the assembled state of the chemical liquid filter of this invention shown in FIG. 27, and FIG. 27 is sectional drawing which shows the other assembled state of FIG.

The chemical liquid filter of the present invention may be composed of a body portion 170, a check valve portion 120, a filter paper 180, the body portion 170 and the check valve portion 120 is formed integrally and the injection It is embedded in the hollow in the needle head 200.

At this time, the body portion 170 is directed toward the tip portion 200a side of the needle head 200 and the check valve portion 120 is inserted toward the rear end portion 200b side.

First, the body portion 170 is formed in a substantially dome (dome) shape as shown in Figures 23 and 24, a hollow space is formed therein and has a predetermined thickness.

And while the upper portion of the body portion 170 is blocked while having a round shape, the lower portion is an open shape.

Alternatively, the body 170 may have a conical shape as shown in FIG. 25.

Therefore, the chemical liquid flows into the lower portion of the body portion 170 and may be filtered out through the upper side and the outer side. At this time, the foreign matter contained in the chemical liquid is left in the inner space of the body portion 170.

However, at least one suction passage 171 is formed in the body 170.

The suction passage 171 may be formed to cut through a portion of the body portion 170 to penetrate the inside. It may be rectangular as shown in FIGS. 23 and 24, or may be trapezoidal as shown in FIG. 25.

Here, the filter paper 180 is attached to the suction passage 171.

The filter paper 180 may be made of a thin material as shown and attached to each suction passage 171, or may be attached to surround the entire outer circumference of the body portion 170 as shown.

The filter paper 180 may be made of a porous material.

For example, porous materials such as 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, weave A material in which pores are formed, such as a fiber or a nonwoven fabric, may be used, and may be manufactured to have some elasticity.

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 body 170 to communicate with each other.

In addition, the check valve unit 120 may have a circular hollow shape in which an inner diameter is formed. Preferably, the check valve unit 120 may have a tubular shape such as a trumpet that extends toward the lower end of the outer diameter.

In addition, the material of the check valve unit 120 may be any material having elasticity, and may be made of a flexible material such as synthetic resin, rubber, and silicone.

At this time, the check valve 120 is preferably formed or processed in one mold so as to be formed integrally with the body 170, the material of the check valve 120 is the material of the body 170 It can be made the same as. For example, it may be manufactured by molding or processing integrally using synthetic resin or silicone or rubber.

On the other hand, as shown in the check valve unit 120, the outer diameter may be made of the same tubular shape. At this time, the outer diameter of the check valve portion 120 is formed larger than the outer diameter of the body portion 170.

Here, an elastic member 140 may be further provided between the syringe cylinder head 310 and the chemical liquid filter 100. One end of the elastic member 140 is seated on the syringe cylinder head 310 and the other end is seated on the bottom surface of the check valve unit 120 of the chemical filter 100. Therefore, since the chemical filter 100 is elastically supported by the elastic member 140, the check valve unit 120 may be more firmly attached to the inner circumferential surface of the needle head 200. Here, the elastic member 140 may use a spring.

Specifically, the type of spring that can be used as the elastic member 140 is a compressive coil spring (comprehensive coil spring), leaf spring (leaf spring), volute spring (volute spring), circular spring (ring spring), dish spring ( Various springs such as disc springs, washer springs, snap springs, snap springs, wire springs, silicon springs, and bellows-type springs can be used.

In this case, as shown in FIG. 26, the locking jaw 240 may be formed in the needle head 200 such that the elastic member 140 is not separated from the needle head 200.

And the protruding jaw 122 is formed on the lower surface of the check valve unit 120. The protruding jaw 122 may also be a continuous structure in a circular shape or a plurality may be arranged in a circle at regular intervals.

As shown in FIG. 11, the cross section of the locking jaw 240 may have a quadrangular, triangular, and semicircular shape.

In addition, as shown in Figure 27, unlike the locking step 240 on the inner circumferential surface of the needle head 200 may have a structure in which a groove-shaped locking groove 250 is formed.

At this time, the cross section of the locking groove 250 may be made of a square, triangle, semi-circle, and the like as shown in FIG.

Alternatively, the support ring 141 may be stably inserted into the locking groove 250. For this purpose, the outer diameter of the support ring 141 is larger than the inner diameter of the needle head 200 so that the elastic member 140 may be fitted on the locking groove 250 to prevent movement.

Therefore, the elastic member 140 can be prevented from leaving in position.

28 is an exemplary view illustrating various embodiments of the present disclosure according to the shape of a needle head. The outer diameter of the lower end of the check valve unit 120 is larger than the inner diameter of the syringe cylinder head 310 to allow the check valve unit 120 to be seated on the upper surface of the syringe cylinder head 310. 310 is not drawn into the interior.

For example, when the inner diameter of the needle head 200 extends from the tip portion 200a to the rear portion 200b as shown in FIG. 28A, the maximum outer diameter of the check valve portion 120 is increased. May be larger than the minimum inner diameter of the needle head 200 and smaller than the maximum inner diameter of the needle head 200.

And when the inner diameter of the tip portion (200a) of the needle head 200 is the same, and the inner diameter of the rear end portion (200b) is expanded as shown in Figure 28 (b), the maximum outer diameter of the check valve unit 120 May be larger than the inner diameter of the needle head tip portion 200a and smaller 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. The check valve unit 120 is in close contact with the inner circumferential surface of the rear end 200b of the needle head 200 even when it is moved forward.

In addition, as shown in FIG. 28C, the inner diameter of the tip portion 200a of the needle head 200 is the same, and the inner diameter of the rear end portion 200b is larger than the inner diameter of the tip portion 200a, and the tip portion 200a and the rear portion thereof. In the case where the intermediate portion 200c having the inner diameter is expanded between the end portions 200b, the outer diameter of the body portion 170 is smaller than the inner diameter of the tip portion 200a of the needle head 200. The maximum outer diameter of the check valve unit 120 may be formed larger than the inner diameter of the front end portion 200a of the injection needle head 200 and smaller than the inner diameter of the rear end portion 200b.

In the present invention, the first magnetic body 151 is attached to the lower surface of the check valve unit 120 to add the same elastic force as the elastic member 140, and the second magnetic body on the inner circumferential surface of the needle head 200. 152 may have a protruding structure.

In addition, by appropriately adjusting the magnetic force of the first, the second magnetic body (151, 152) of course, the chemical liquid filter 100 should be set so as to retreat to the pressure at the time of chemical liquid suction.

30 is a cross-sectional view showing yet another embodiment of the present invention.

In addition, an auxiliary filter 160 may be further inserted between the syringe cylinder head 310 and the chemical liquid filter 100.

The auxiliary filter 160 may also be made of a material substantially the same as that of the material of the body 170 described above.

The auxiliary filter 160 is a chemical liquid is passed through a narrow tube of the subsidiary filter 160 when the chemical liquid discharge, the flow rate is increased and the chemical liquid filter 100 is the whole while the raised chemical liquid presses the body portion 170 While pushing at a higher speed, it may be quickly adhered to the inner circumferential surface of the needle head 200.

Hereinafter, an operating state of the present invention will be described with reference to FIG. 31.

FIG. 31 is an operating state diagram of the present invention shown in FIG. 26, where (a) shows a case of inhaling a chemical solution and (b) shows a case of discharging a chemical solution.

Since the pressure of the chemical liquid introduced into the needle head 200 and the suction pressure inside the head pressurize the body unit 170, the whole of the present invention including the body unit 170 and the check valve unit 120 includes: Reverse At this time, since the chemical filter 100 is reversed, the elastic member 140 is compressed.

In the case of operating as shown in (b) to discharge the chemical liquid, when the plunger 400 of the syringe cylinder 300 is pushed, the internal pressure increases and the chemical liquid passes through the syringe cylinder head 310 through the needle head 200. Flows into).

Since the introduced chemical liquid is pressurized by the discharge pressure while filling the space inside the body part 170 and the check valve part 120, the check valve part 120 is in close contact with the inner circumferential surface of the needle head 200. .

Therefore, the chemical liquid is discharged through the suction passage 171 of the body portion 170, the foreign matter is filtered through the filter paper 180 is discharged, the discharged chemical liquid is discharged through the needle 210 Are 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.

Claims

Syringe filtering device including a syringe cylinder in which a syringe cylinder head is formed at the front end, a needle head into which the syringe cylinder head is fitted, and a chemical filter that is inserted into the hollow of the needle head and filters foreign substances contained in the chemical liquid. To

The chemical filter,

A filter part made of a porous material and forming a dome shape; And

Is formed to extend the outer diameter from the bottom of the filter portion check valve portion which is seated on the syringe cylinder head;

Injecting the chemical liquid is sucked between the inner circumferential surface of the needle head and the check valve portion, and when the chemical liquid is discharged, the check valve portion is in close contact with the inner circumferential surface of the needle head while the chemical liquid is filtered through the filter unit for ejection Chemical filtering device.
The method of claim 1,

At least one suction passage is formed at a lower end of the check valve part,

Inhalation of the chemical liquid is sucked into the syringe cylinder through the suction passage, and when the chemical liquid discharge, the check valve portion is in close contact with the inner peripheral surface of the needle head while the chemical liquid is filtered through the filter unit, characterized in that the chemical filtering for the syringe Device.
The method of claim 1,

Between the syringe cylinder head and the chemical filter is provided with an elastic member for elastically supporting the chemical filter,

When the chemical liquid is inhaled, the elastic member is compressed to be sucked between the inner circumferential surface of the needle head and the check valve portion, and when the chemical liquid is discharged, the elastic member is restored so that the check valve portion is in close contact with the inner circumferential surface of the needle head, and the chemical liquid is filtered. Syringe filtering device characterized in that the discharge through the filtered through.
The method of claim 1,

A first magnetic body is attached to a lower surface of the check valve part, and a second magnetic body having the same polarity as that of the first magnetic body protrudes from the inner peripheral surface of the needle head.

When the chemical liquid is sucked in, it is sucked between the inner circumferential surface of the needle head and the check valve part, and when the chemical liquid is discharged, the check valve part is in close contact with the inner circumferential surface of the needle head by the repulsive force between the first and second magnetic bodies, and the chemical liquid is filtered through the filter part. Syringe filtering device characterized in that the discharge is made.
The method of claim 1,

Between the syringe cylinder head and the chemical liquid filter is provided with a funnel-shaped auxiliary filter in which one side is embedded in the chemical liquid filter and the other side is in close contact with the inner peripheral surface of the needle head,

The chemical filter is primarily filtered by the auxiliary filter while being sucked between the inner circumferential surface of the needle head and the check valve portion when inhaling the chemical liquid, and the check valve is in close contact with the inner circumferential surface of the needle head when the chemical liquid is discharged. The drug liquid filtering device for a syringe, characterized in that is discharged after filtering through.
The method according to any one of claims 1 to 5,

The needle head is formed so as to extend the inner diameter from the front end to the rear end,

The outer diameter of the filter portion is smaller than the minimum inner diameter of the needle head, the maximum outer diameter of the check valve portion is greater than the minimum inner diameter of the needle head, the chemical liquid filtering device for a syringe, characterized in that less than the maximum inner diameter.
The method according to any one of claims 1 to 5,

The front end portion of the needle head is the same inner diameter and the rear end is formed so that the inner diameter is expanded,

The outer diameter of the filter portion is smaller than the inner diameter of the distal end of the needle head, the maximum outer diameter of the check valve portion is larger than the inner diameter of the distal end of the needle head, it is smaller than the inner diameter of the rear end of the needle chemical filtering device.
The method according to any one of claims 1 to 5,

The tip end portion of the needle head has the same inner diameter and the rear end portion has the same inner diameter but is larger than the inner diameter of the tip portion, and the middle portion between the tip portion and the rear end portion is formed to expand the inner diameter.

The outer diameter of the filter portion is smaller than the inner diameter of the distal end of the needle head, the maximum outer diameter of the check valve portion is larger than the inner diameter of the distal end of the needle head, it is smaller than the inner diameter of the rear end chemicals filtering device for a syringe.
The method of claim 8,

The drug solution filtering device for a syringe, characterized in that the step that the syringe cylinder head can be caught on the boundary between the intermediate portion and the rear end is formed.
The method of claim 9,

At least one rib of the protruded shape is formed on the inner circumferential surface of the rear end of the needle head so as to forcibly fit the syringe cylinder head.
The method of claim 10,

The rib may include a first rib and a second rib that protrudes more than the first rib.
The method of claim 9,

One or more collars are formed to extend outwardly on the outer circumference of the rear end of the needle head, and a fastener formed on the inner circumferential surface of the syringe cylinder head is formed on the outer side of the syringe cylinder head,

The medicine filtering device for a syringe, characterized in that the collar can be screwed to the spiral projection.
The method according to any one of claims 1 to 5,

A tapered contact portion is formed between the filter portion and the check valve portion.

The close contact portion is a chemical liquid filtering device for a syringe, characterized in that the inner diameter is in close contact with the boundary point of the front end and the rear end of the needle head.
The method according to any one of claims 1 to 5,

The filter unit is a chemical liquid filtering device for the syringe, characterized in that irregularities are formed to increase the surface area.
The method of claim 3, wherein

The drug filtering device for a syringe, characterized in that the elastic member is a spring.
The method of claim 15,

A locking jaw is formed in the needle head so that one end of the elastic member is caught, and a projection jaw inserted into the elastic member is formed at a lower surface of the check valve unit.
The method of claim 15,

A locking groove is formed in the needle head so that one end of the elastic member can be inserted, and a projection jaw inserted into the elastic member is formed on a lower surface of the check valve unit. .
The method of claim 5,

An elastic member is provided between the auxiliary filter and the chemical liquid filter, and the chemical liquid filtering device for the syringe may be elastically supported.
Syringe filtering device including a syringe cylinder in which a syringe cylinder head is formed at the front end, a needle head into which the syringe cylinder head is fitted, and a chemical filter that is inserted into the hollow of the needle head and filters foreign substances contained in the chemical liquid. To

The chemical filter,

A main body portion having a dome or cone shape and having at least one suction passage formed on an outer circumferential surface thereof;

Filter paper attached to the suction passage;

Is formed to extend the outer diameter from the lower end of the main body portion check valve portion which is seated on the syringe cylinder head;

Inhalation of the chemical liquid is sucked between the inner circumferential surface of the needle head and the check valve portion, and when the chemical liquid discharged, the check valve portion is in close contact with the inner circumferential surface of the needle head while the chemical liquid is filtered through the suction passage is characterized in that the syringe Chemical solution filtering device.
Syringe filtering device including a syringe cylinder in which a syringe cylinder head is formed at the front end, a needle head into which the syringe cylinder head is fitted, and a chemical filter that is inserted into the hollow of the needle head and filters foreign substances contained in the chemical liquid. To

The chemical filter,

A main body portion having a dome or cone shape and having at least one suction passage formed on an outer circumferential surface thereof;

Filter paper attached to the suction passage;

It includes a check valve formed on the lower end of the main body portion larger than the outer diameter of the main body portion and seated on the syringe cylinder head;

Inhalation of the chemical liquid is sucked between the inner circumferential surface of the needle head and the check valve portion, and when the chemical liquid discharged, the check valve portion is in close contact with the inner circumferential surface of the needle head while the chemical liquid is filtered through the suction passage is characterized in that the syringe Chemical solution filtering device.
The method of claim 19 or 20,

The main body and the check valve unit is a chemical liquid filtering device for a syringe, characterized in that formed by molding or processing any one of synthetic resin, silicone, rubber.
The method of claim 21,

An elastic member is provided between the syringe cylinder head and the chemical liquid filter, and the chemical liquid filtering device for the syringe may be elastically supported.
The method of claim 22,

The drug filtering device for a syringe, characterized in that the elastic member is a spring.
The method of claim 22,

A locking jaw is formed inside the needle head so that one end of the elastic member is caught, and a protrusion jaw inserted into the elastic member is formed on a lower surface of the check valve unit.
The method of claim 22,

A locking groove is formed in the needle head so that one end of the elastic member can be inserted, and a projection jaw inserted into the elastic member is formed on a lower surface of the check valve unit. .
The method according to any one of claims 19 to 25,

The needle head is formed so as to extend the inner diameter from the front end to the rear end,

The outer diameter of the main body portion is smaller than the minimum inner diameter of the needle head, the maximum outer diameter of the check valve portion is greater than the minimum inner diameter of the needle head, the chemical liquid filtering device for a syringe, characterized in that less than the maximum inner diameter.
The method according to any one of claims 19 to 25,

The front end portion of the needle head is the same inner diameter and the rear end is formed so that the inner diameter is expanded,

The outer diameter of the main body portion is smaller than the inner diameter of the distal end of the needle head, the maximum outer diameter of the check valve portion is larger than the inner diameter of the distal end of the needle head, it is smaller than the inner diameter of the rear end of the needle chemical filtering device.
The method according to any one of claims 19 to 25,

The tip end portion of the needle head has the same inner diameter and the rear end portion has the same inner diameter and is larger than the inner diameter of the tip portion, and the middle portion between the front end portion and the rear end portion is formed to expand the inner diameter.

The outer diameter of the main body portion is smaller than the inner diameter of the distal end of the needle head, the maximum outer diameter of the check valve portion is larger than the inner diameter of the distal end of the needle head, the chemical liquid filtering device for a syringe, characterized in that smaller than the inner diameter of the rear end.