JP2002172169A - Micro injector needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injector needle for relieving pain in the case of injecting and to provide an injector. SOLUTION: The injector needle 1 provided with a hollow structure and <=100 μm diameter concerning a cylindrical cross section surface is molded by plastic. An injector needle part 10 where the injector needles 1 are arranged on a base part 3 is molded by plastic and mounted on the tip of the cylinder of an injector so as to constitute the injector. Since the diameter of the injector needle 1 is small, i.e., <=100 μm, pain is not felt when the injector needles 1 prick skin. The outer diameter is small and more than one injector needles 1 are arranged to prevented from being bent or broken. Besides, a guide mechanism is disposed to prevent the change of a posture in each injector needle in the case of injecting and to prevent bending stress to be given as far as possible. A medicine flow-out hole 2 in each injector needle 1 is arranged on the tip slope or the side surface of the needle so as not to irritate a nerve with pain. The medicine flow-out holes 2 are arranged at the tip of the respective injector needles when the needles 1 are used for a liquid medicine distributor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical syringe, a needle thereof, and a chemical dispenser for dispensing a chemical reagent.

[0002]

2. Description of the Related Art A syringe is used for inserting a needle into a human body and injecting a drug solution into the human body. Generally, a syringe which is painful when the needle is pierced into the human body is generally used. This is due to the large diameter of the injection needle. When a liquid medicine is pushed out from the cylinder part of the syringe and injected into the human body, the force applied at this time is transmitted to the injection needle, and at this time bending stress is applied to the injection needle and rigidity is given to the injection needle so that the injection needle does not bend or break. Must be provided. Therefore, the outer diameter of the injection needle is large and thick. Conventional injection needles are mainly made of metal and have a diameter on the order of hundreds of μm to mm. As a result, the person receiving the injection feels pain because the thick injection needle penetrates into the human body while hurting the skin and stimulating the pain sensory nerve.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an injection needle and a syringe which do not cause a person receiving an injection to feel pain, or have less pain even if they feel pain. It is an object of the present invention to provide a chemical liquid distributor capable of distributing various chemical liquids.

[0004]

The injection needle of the present invention is made of plastic, has a hollow structure, a cylindrical cross section, and a diameter of 1 mm.
The size is not more than 00 μm. Then, an outflow hole for the drug solution is provided on the tip slope or side surface of the injection needle. A syringe is configured by arranging the injection needles in a line, arranging them in an array, or arranging a plurality of needles in an arbitrary arrangement. Further, a guide mechanism is provided to keep the angle between the injection target surface and the axis of the injection needle constant in order to prevent the injection needle from bending or breaking.

[0005] Further, the above-mentioned injection needle is used for a drug solution distributor. Also in this case, the medical solution distributor is configured by arranging the injection needles in a line, arranging them in an array, or arranging a plurality of needles in an arbitrary arrangement. Also, the injection needle described above,
Further, a plurality of injection needles arranged in a line, in an array, or in any shape are molded by plastic molding. Also, the liquid medicine distributor constituted by such an injection needle is formed by plastic molding. At this time, the chemical solution outflow hole is processed by laser processing or the like after plastic molding. or,
In a mold for plastically molding an injection needle or the like, a portion forming a needle and a tube is configured to have no division surface.

[0006]

FIG. 1 is a sectional view of a micro injection needle according to an embodiment of the present invention. This injection needle 1 is
The distal end 1a is closed in a hollow cylindrical shape, and the shape of the distal end 1a forms a sharp needle tip at an acute angle. This tip 1a
Is formed with a drug solution outflow hole 2 communicating with the internal hollow space 1c of the injection needle 1. This micro injection needle 1 is formed of plastic, and the outer diameter of the hollow cylindrical portion 1b is 1 μm.
It has a small outer diameter of several tens of μm from 100 m to 100 μm. In this embodiment, the thickness is about 50 μm. As will be described later, the micro injection needle 1 is made of plastic, and the hollow cylindrical portion 1b and the distal end portion 1a are integrally formed. Is formed on the slope at the tip 1a from the hollow cylindrical portion 1b to the tip. In this embodiment, the chemical solution outflow hole 2 is provided on the inclined surface at the tip end, but may be provided on the side surface.

The injection needle 1 has a small outer diameter of 100 μm or less, and the tip 1a pierced by the skin is narrowed to have a sharp needle tip. Therefore, even if this injection needle 1 is pierced into the skin, it can enter the human body without stimulating the painful nerve. In addition, since the drug solution outflow hole 2 is not provided at the tip of the injection needle 1 and is formed on the slope or side surface of the tip 1a, the needle tip can be made sharper, so that damage to the skin is reduced. be able to.

Although the single needle 1 may constitute a syringe, there is a drawback that the syringe needle is easily broken as a syringe needle for a human body because the outer diameter of the syringe needle 1 is small. Furthermore, there is a disadvantage that the amount of the drug solution that can be injected by the single injection needle 1 is small. Therefore,
FIG. 2 shows an example in which a plurality of the injection needles 1 are arranged to form an injection needle portion of a syringe so that the injection needle 1 is hardly broken and an appropriate amount of a drug solution can be injected.

In FIG. 2, an injection needle portion 10 is mounted in a cartridge type at the tip of a cylinder of a syringe.
The dimensions and shape are formed in accordance with the cylinder of the syringe so as to be detachable from the cylinder of the syringe. A plurality of injection needles 1 are arranged on the mountable base 3 in an array. The plurality of injection needles 1 has the configuration shown in FIG. 1, and the hollow space 1 c of each injection needle 1 penetrates the base 3 and reaches the lower surface of the base 3. The injection needle portion 10 including the base portion 3 and the plurality of injection needles 1 is integrally formed by plastic molding. Then, the base portion 3 of the injection needle portion 10 is fitted and mounted on the cylinder of the syringe to complete the syringe.

In the example shown in FIG. 2, a plurality of injection needles 1 are arranged on the base portion in an array. However, a plurality of injection needles 1 may be arranged in a single row, or in a circular shape. The needles may be arranged, or a plurality of injection needles may be arranged in any shape.

Although the above-mentioned example is an example of a syringe, the micro injection needle can be used as a needle of a liquid distributor. When used as a needle for a liquid distributor,
The chemical solution outflow hole 2 is provided not at the slope or side surface of the tip 1a but at the tip of the tip 1a. That is, the drug solution outflow hole 2 is provided at a tip position on the axis of the injection needle 1.
In addition, in the case of a medicine dispenser, since this injection needle is not stabbed into a human body or the like, if care is taken, no extra load such as bending or breaking of this injection needle is applied. The liquid distributor may be formed by one injection needle. In this case, the amount of the drug solution flowing out of the liquid distributor becomes very small, so that it is suitable for dispensing a small amount of the drug solution. Further, similarly to the above-described syringe, a plurality of injection needles may be provided to constitute a drug solution distributor.

FIG. 3 shows a plurality of injection needles 1 ′ for a liquid distributor.
It is explanatory drawing of the cartridge-type injection needle part 20 provided with.
The configuration of the cartridge-type injection needle portion 20 is substantially the same as the configuration of the injection needle portion 10 of the syringe shown in FIG. 2, but as described above, the drug solution outflow hole 2 'of each injection needle 1' is The only difference is that it is provided at the tip of 1 '.
In the cartridge-type injection needle section 20, similarly to the injection needle section 10 of the syringe shown in FIG. 2, the injection needles 1 'are arranged in an array on the base 3'. The arrangement of this injection needle 1 '
It can be arranged in one line or in a circle, but according to the position and shape of the distribution destination to distribute the chemical,
Arrangement can be made arbitrarily, and if the injection needles 1 'are arranged so that each one corresponds to one of the arranged distribution destinations, a plurality of injection needles can be formed at once and reliably. The same amount of the drug solution can be distributed to the distribution destination.

FIG. 4 is a cross-sectional view of a mold for plastically molding the injection needles 1 and 1 'of the above-mentioned syringe and drug dispenser. FIG. 4 shows a mold structure for molding the above-described injection needle portion 10 having the plurality of injection needles 1.

The mold is constituted by a sleep rate mold,
The male mold plate 5 and the female mold plate 6 constitute a cavity 8 for molding the injection needle portion 10 of the molded product. The mold split surface PL1 of the mold plate 5 and the female plate 6 at the lower surface position of the base portion 3 of the injection needle portion 10 of the molded product
Is provided at a position corresponding to the tip of the injection needle of the molded product, and a mold dividing surface PL2 of the mold plate 7 and the female mold plate 6 is provided, and this mold dividing surface PL2 is used as an air vent.

As is apparent from the mold structure shown in FIG.
In the present invention, it is designed so that the mold dividing surface does not come to the portion forming the injection needle. This may cause burrs (solidified resin that has entered the gaps between the divided surfaces) and steps on the mold divided surface. When an injection is carried out with a needle having a burr, there is a risk that the burr will peel off from the surface of the needle and be left on the human body. In addition, if there is a step, it becomes a resistance when the injection needle is pierced and penetrated into the skin, and it is likely to cause pain. Therefore, the injection needle portion 10 is formed by designing a die in which the die split surface is not formed at the position where the injection needle is formed.

In the case of the injection needle portion 20 of the drug dispenser shown in FIG. 3, the tip portion also receives the drug solution outlet hole 2 '. In this case, when the injection needle portion 20 is formed of plastic. Although it is possible to form the drug solution outflow hole 2 ′, in the case of the injection needle portion 10 of the syringe, the drug solution outflow hole 2 ′ is formed.
Is provided on the inclined surface or side surface of the distal end portion 1a, so that the chemical solution outflow hole 2 cannot be formed. For this reason, after the injection needle part 10 is formed of plastic, the slope or side surface of the tip part 1a must be perforated. Since the injection needle 1 itself has a very small outer diameter of 100 μm or less,
Naturally, the diameter of the drug solution outflow hole 2 is also small. For example, when the outer diameter of the injection needle 1 is about 50 μm, the diameter of the drug solution outflow hole 2 must be small. Therefore, in the present embodiment, the chemical solution outflow hole 2 is processed by laser processing.

FIG. 5 is an explanatory diagram of a process of forming a drug solution outflow hole for each injection needle of the plastic injection needle portion 10 by laser light. The YAG laser beam LL is narrowed down to a spot diameter of about 10 μm, and the tip 1 a of the injection needle 1 is
Irradiation on the slope or side surface of the
To process. Since the amount of energy of the laser beam LL can be minutely controlled, processing can be performed under the condition that dross does not occur. Also, by scanning a predetermined amount of laser light, or by a linear stage, etc.
By moving the injection needle portion 10 at a predetermined pitch, the drug solution outflow holes 2 can be sequentially drilled for each injection needle. In addition, the drug solution outflow hole 2 'of the injection needle for the drug solution distributor.
May also be performed by the above-described laser processing.

As described above, since the injection needle of the present invention has a small diameter, it may be bent or broken. For this purpose, a plurality of injection needles are arranged to form an injection needle portion, and this injection needle portion is mounted on a cylinder such as a syringe to constitute a syringe. Further, as a method of preventing the injection needle from bending or breaking, the posture of the injection needle is maintained so that the bending force is not applied to the injection needle, and the axis of the injection needle and the skin surface are kept. An injection needle is provided with a guide mechanism which keeps the angle between the injection needles constant and does not apply any force to the injection needle so as to intersect the axis of the injection needle.

FIG. 6 shows an embodiment of a syringe provided with this guide mechanism. The injection needle portion 10 in which the plurality of injection needles 1 are disposed on the base portion 3, the tubular guide portion 31 constituting the guide mechanism 30, the elastic portion 32 connecting the guide portion 31 and the base portion 33, and the base portion 33 , Are integrally molded with plastic. Note that it is not always necessary to integrally shape all of them, and it is desirable that at least the injection needle portion 10 and the guide portion 31 be integrally formed. Further, the cylinder part 34 constituting the syringe is fitted through the hole provided in the base part 33 to the base part 3 of the injection needle part 10, and thereafter,
The holding portion 38 having the bellows portion 39 is fitted into the hole of the base portion 33. Then, the piston 3 mounted on the cylinder portion 34
The fifth piston rod 36 is brought into contact with a bellows portion 39 provided on a holding portion 38.

The base part 3 and the guide part 31 of the injection needle part 10
Constitutes a hinge portion 37 by reducing the thickness of both ends thereof,
The base part 3 and the guide part 31 are connected to each other by making the hinge part 37 bendable. In addition, in a state before using this syringe, as shown in FIG. 6, the distal end of the guide portion 31 slightly protrudes from the distal end of each injection needle 1. In the unused state of this syringe, the injection The needle 1 is housed in a tubular guide portion 31. For example, in an unused state, a sealing seal or the like is adhered to the distal end surface of the guide portion 31 to protect the internal injection needle and the like.

In use, first, as shown in FIG. 6, the front end of the guide portion 31 is brought into contact with the skin 40, and then the base portion 33 and the holding portion 38 of the guide mechanism 30 are pressed.
While pressing the elastic portion 32 of the guide mechanism, the pressing portion 3
8 pushes down the cylinder 34, so that the injection needle 1
Hinge part 37 connecting base part 3 of 0 and guide part 31
Is bent, the injection needle part 10 is moved in the direction of the skin 40, and the inner corner injection needle 1 of the skin 40 is inserted as shown in FIG. At this time, since the distal end surface of the guide portion 31 is in contact with the skin 40 and the posture of the entire syringe is kept constant, when the injection needle 1 is pierced into the skin 40, the injection needle 1 intersects the injection needle 1. Since little force acts on the injection needle 1 and little force acts on the injection needle 1 to bend the injection needle 1, the injection needle 1 can be prevented from being bent or broken.

After the injection needle 1 is pierced and inserted into the skin 40, the bellows portion 39 is pressed to push down the piston 35 of the syringe, and the drug solution 41 stored in the cylinder 34 is injected into each injection as shown in FIG. Inject into the skin via needle 1.
Even when this medicinal solution is injected into the human body, since the posture of each injection needle 1 is kept constant by the guide member 31, almost no bending stress acts on each injection needle. Does not break or bend.

When the guide mechanism is used as described above, the posture of the injection needle is kept constant by the guide mechanism during use, so that little bending stress acts on the injection needle. Therefore, the number of injection needles provided in the injection needle section 10 may be reduced. Even a single needle can be used without bending or breaking the needle. In this case, it is safer if the inner diameter of the guide portion of the guide mechanism is reduced to surround one injection needle. or,
In the case where the injection needles are arranged in one line, the injection needles may be guided so as to be sandwiched from both sides.

FIG. 8 is an explanatory diagram showing a simplified example of a syringe having one injection needle 1. As shown in FIG. 8, the injection needle 1 is inserted into a hole 52 provided in the guide portion 51 of the guide mechanism 50 to protect the injection needle 1 itself. In use, the guide portion 51 is brought into contact with the skin, and the piston operating portion 53 of the syringe is operated to make the first spring portion 55
, The pressing member 54 is moved against the second spring portion 56 to move the cylinder 57 to move the injection needle 1 to the guide portion 5.
1 and stab it into the skin. Cylinder 5
7 comes into contact with the inner upper surface 51a of the guide portion 51, the relative movement of the cylinder 57 with respect to the guide portion 51 stops, and the insertion of the injection needle 1 into the skin ends. Further, a piston operation unit 5
When the third member 3 is pressed, the first spring 55 having a larger spring constant than the second spring portion 56 is reduced, and the piston 58 moves to inject the drug solution into the skin.

Even when a plurality of injection needles are provided as a syringe, holes for inserting the respective injection needles are formed in the guide portion corresponding to the respective injection needles as shown in FIG. The injection needles may be inserted into the injection needles, respectively, and the injection needles may be guided and held so that no force in the direction intersecting the axis acts on the injection needles.

When the injection needles are arranged in rows, for example, when the injection needles are arranged in one row, a guide member is provided so as to sandwich this row from the left and right, and May not be applied in the direction intersecting with.

[0027]

According to the present invention, since the diameter of the injection needle is small, the injection can be performed without causing any pain to a patient such as a patient. Further, since the injection needle is made of plastic, the injection needle can be manufactured at high speed and at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an injection needle according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an injection needle portion provided with a plurality of injection needles in one embodiment of the present invention.

FIG. 3 is an explanatory view of an injection needle portion provided with a plurality of injection needles for a drug solution distributor according to another embodiment of the present invention.

FIG. 4 is an explanatory view of a mold for plastically molding the injection needle of the present invention.

FIG. 5 is an explanatory view of a method for processing a drug solution outflow hole of an injection needle according to the present invention.

FIG. 6 is an explanatory view of a syringe provided with a guide mechanism according to still another embodiment of the present invention.

FIG. 7 is a diagram showing a state in which an injection is performed and a drug solution is injected into a human body or the like in the embodiment.

FIG. 8 is an explanatory view of a syringe provided with a guide mechanism for one injection needle in still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection needle 2 Chemical outflow hole 3, 3 'Base part 5, 6, 7 Mold plate PL1, PL2 Mold division surface 30, 50 Guide mechanism 31, 51 Guide part 34, 57 Cylinder 35, 58 Piston 40 Skin 41 Chemical liquid

Claims (21)

[Claims] 1. An injection needle, wherein the injection needle is made of plastic and has a hollow structure, a cylindrical cross section, and a diameter of 1 μm or more and 100 μm or less. 2. The injection needle according to claim 1, wherein an outflow hole for the drug solution is disposed on a slope or a side surface at the tip. 3. A syringe in which a plurality of injection needles according to claim 1 or 2 are arranged. 4. A syringe, wherein the injection needles according to claim 1 or 2 are arranged in a line. 5. A syringe, wherein the injection needles according to claim 1 or 2 are arranged in an array. 6. The syringe according to claim 3, further comprising a guide mechanism for maintaining a constant angle between a surface to be injected and an axis of the injection needle. 7. A syringe needle made of plastic and having a hollow structure having a cylindrical cross section and a diameter of 1 μm or more and 100 μm or less, and an outflow hole for a drug solution is arranged at the tip of the injection needle. Characteristic liquid distributor. 8. The liquid medicine distributor according to claim 7, wherein a plurality of said injection needles are arranged. 9. The liquid medicine distributor according to claim 7, wherein the injection needles are arranged in a line. 10. The liquid medicine distributor according to claim 7, wherein the injection needles are arranged in an array. 11. A method for manufacturing an injection needle, wherein the injection needle is formed of plastic and has a hollow structure, a cylindrical cross section, and a diameter of 1 μm or more and 100 μm or less. 12. The method for producing an injection needle according to claim 11, wherein after the injection needle is molded into a plastic, an outflow hole for the drug solution is formed on a slope or a side surface of the tip of the injection needle. 13. The method for producing an injection needle according to claim 12, wherein a plurality of injection needles are arranged and molded simultaneously. 14. The method according to claim 12, wherein the injection needles are formed in a line. 15. The method according to claim 12, wherein the injection needles are arranged in an array and molded. 16. The method for manufacturing an injection needle according to claim 12, wherein the processing of the drug solution outflow hole is performed by laser processing. 17. An injection needle having a hollow cross-section, a diameter of 1 μm or more and 100 μm or less, which is made of plastic and has a hollow cylindrical structure, is formed of plastic, and a drug solution outlet hole is formed at the tip of the injection needle. A method for producing a chemical liquid distributor. 18. The method according to claim 17, wherein a plurality of injection needles are arranged and molded at the same time. 19. The method according to claim 17, wherein the injection needles are formed in a line. 20. The method according to claim 17, wherein the injection needles are arranged in an array and molded. 21. A molding die for molding an injection needle or a drug solution distributor according to claim 11, wherein a portion forming a needle and a tube has no dividing surface. .