JPH0716297A - Medical needle - Google Patents

Abstract

PURPOSE:To easily break a medical needle to a safe condition and easily make the needle harmless via the application of heat such as burning by forming the needle out of a non-metallic material such as carbon and ceramic material having a sharpened forward end. CONSTITUTION:This needle 1 is formed out of hollow carbon material with the tip 1a thereof sharpened, and the hollow section of the needle 1 is used as a fluid flow passage 2 for chemicals, blood or the like. An open section 3 is formed on a needle tip for making the passage 2 communicate externally, and the rear end thereof has a communication hole 4 to a vessel. In this case, the hollow carbon material is formed by carbonizing hollow fiber such as hollow polyester fiber or hollow polyamide fiber. Whenever necessary, a resin coat is applied to the surface of the carbon material or the surface is impregnated with a resin. Also, as the material of the needle 1, a hollow ceramic body or a mixture of a synthetic resin and ceramic are alternatively used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surgical needle used for suturing or the like in surgery, or a medical needle such as a hypodermic needle used for subcutaneous injection of liquid or blood collection.

[0002]

2. Description of the Related Art Conventionally, needles used for medical purposes are made of metal such as stainless steel from the viewpoint of strength and price.

Examples of this medical needle include a surgical needle used for suturing in surgery, an injection needle used for subcutaneous injection of liquid, blood collection, and the like.

When this needle for medical use is used once and then reused, there is a risk of inducing infectious diseases such as human immune system diseases. After the needle has been used once, it is discarded. It is desirable to do.

[0005]

However, such a medical needle made of metal has extremely high strength and it is extremely difficult to destroy it to a safe state, and if it is partially destroyed, it is sharp. Such a tip causes a risk of injuring the operator, and in this case, there is a great risk of inducing infectious diseases such as human immune system diseases.

For this reason, in order to bring the metal medical needle into a safe state, for example, a treatment such as pouring and hardening a thermosetting resin into a large number of medical needles is necessary. It requires a special treatment device, requires a considerable amount of cost for this treatment, is extremely uneconomical, and requires great care in dumping medical needles treated with a thermosetting resin. To do.

The present invention has been completed in order to solve the above technical problems, and a needle used for medical treatment is formed of a non-metal body having a sharpened tip.
An object of the present invention is to provide a medical needle that can be easily crushed to a safe state or can be made extremely safe and harmless by heating such as combustion.

[0008]

The medical needle of the present invention is a needle used for medical treatment in order to achieve the above object, and the needle is formed of a non-metal body having a sharpened tip. It is characterized by being

The needle to which the present invention is applied is not particularly limited as long as it is used for medical purposes, and includes both non-hollow medical needles and hollow injection needles.

The non-hollow medical needle is suitable for, for example, suturing in surgery, and has a diameter of 0.2 to, for example.
The thing of several mm is mentioned.

The hollow medical needle, that is, the injection needle, is used for subcutaneous injection of liquid, blood collection, etc., and has a diameter of, for example, 0.2 to several mm. In this case, the injection needle is combined with a needle support and a liquid container and used as a syringe or an injector for medical treatment.

In the present invention, the non-metal body is made of a material other than metal and has a strength such that it can be used as a medical needle, and is made of a material capable of being mechanically crushed, burned or thermally crushed. It is not particularly limited as long as it is formed, and specifically, it is particularly formed of a carbon body, a ceramic body, or a mixture of synthetic resin and ceramics.

In the present invention, examples of the carbon body include solid and hollow ones having sharpened tips, and the medical needle of the present invention includes, for example, natural products such as bamboo and various thermoplastic resins. Alternatively, it is obtained by heat-treating a needle material such as a linear or curved shape having a sharpened tip formed of a synthetic resin such as various thermosetting resins at 200 ° C. or higher, particularly at 300 to 600 ° C., From this point of view, in the present invention, the carbon body does not necessarily need to be completely carbonized, and may be one having strength as a medical needle.

As a concrete representative example of this transparent synthetic resin layer, for example, the synthetic resin used in the present invention is
It is added in order to reduce the weight, improve workability and water resistance, and it is preferable to use one that can be used as a structural material. Specifically, for example, polyethylene, polycarbonate, acrylic resin, aromatic or aliphatic polyamide, polysulfone, polypropylene, polyester, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyvinyl chloride-polyvinylidene chloride, polyurethane, polyarylate. , Polyoxybenzoyl, polyphenylene oxide, polyphenylene sulfide, polyamide imide, polyamino bismaleimide, polyacetal, polyether ether ketone, polysulfone, bismaleimide triazine, polyether sulfone, polyethyleneoxybenzoyl, fluororesin, polyimide, epoxy resin, non Saturated polyester resin, phenol resin, diallyl phthalate resin, thermosetting polyurethane resin, UV curable poly Urethane resins, moisture-cure polyurethane, electron beam-curing polyurethane resin, silicone resin,
A linear or curved needle material or a hollow needle material formed of an alkyd resin or the like can be used.

In the present invention, the hollow medical needle may be formed of a hollow carbon body obtained by carbonizing hollow fibers. For example, a thermally decomposable or thermally volatile or soluble core body is used. It is also possible to form the resin layer on the surface, volatilize the core body by thermal decomposition or heat, or extract with a solvent, thereby forming a needle material, and then carbonizing.

Examples of the hollow fiber include hollow polyester fiber and hollow polyamide fiber.

In the present invention, examples of the ceramic body include a solid body having a sharpened tip and a hollow body. The solid body of the hollow body is, for example, a ceramic composition extruded from a die having a desired pore size. Further, it is only necessary to cure a linear or curved needle material having a sharpened tip, or to mold the ceramic composition into a desired shape and cure it.

In the present invention, the hollow ceramic body having a sharpened tip is disclosed in, for example, Japanese Patent Laid-Open No. 3-76819.
The method disclosed in the publication is adopted. That is, the hollow ceramic body obtained by this method is a heat insulating material,
It is used as a catalyst carrier, an enzyme, and a carrier for microorganisms, and this technology is applied here.

In this method, tetraalkoxy titanate is hydrolyzed and polycondensed with an acid catalyst and water in the acid catalyst and in the air in the presence or absence of alcohols to give a spinnable sol solution. Then, a hollow needle material is obtained from the sol solution, which is dried and cured.

Further, as another one, New Glass
s vol3. No. 3. 1988 pp81-87, the method for producing a Y-BA-Cu-O-based hollow ceramic gel fiber is applied.

[0021] Still another is Advanced.
Ceramic Materials 3 [I] 29
-31 (1988), hollow carbon fibers of various ceramics such as TiO ₂ are obtained by impregnating activated carbon fibers with an aqueous solution of a metal salt, drying and firing to remove carbon. The method of obtaining is applied.

In the present invention, the mixture of synthetic resin and ceramics is a solid needle material having a sharpened tip,
Alternatively, the hollow needle material is cured. The needle material may be linear or curved.

In the present invention, the mixing ratio of the synthetic resin and the ceramics varies depending on the synthetic resin or the ceramics to be obtained, but generally 10 to 500 parts by weight of the ceramics, particularly 100 to 3 parts by weight per 100 parts by weight of the synthetic resin.
50 parts by weight is desirable.

The ceramic may be a natural product or a synthetic product.

[0025] Among these ceramics, those containing one kind or two or more kinds are also included.

Examples of the synthetic resin used in the present invention include the above-mentioned ones. In the present invention, if desired, a titanium-based coupling agent,
Alternatively, it may be used in combination with a silicon-based coupling agent or the like.

Needless to say, in the present invention, ceramics includes glass.

By the way, in such a mixture of synthetic resin and ceramics, the synthetic resin component is extremely easily decomposed by heating, and the medical needle is easily disassembled, which is extremely beneficial.

The shape of the tip of the medical needle of the present invention, especially the hollow medical needle, is not particularly limited, but the hollow medical needle can be used for taking out the liquid medicine inside the container. When the air is introduced into the container, the mouth rubber stopper of the container is punctured, but the tip is cut diagonally like a normal injection needle, and the tip is open,
The rubber plug may be cut off by the needle tip and mixed into the chemical liquid as a minute foreign substance.

Therefore, in order to prevent this, it is advantageous for the hollow medical needle to have a sharpened tip and a side hole in the vicinity of the tip which communicates with the hollow portion of the needle.

Further, in the present invention, in order to improve the strength and safety of the hollow carbon body, the surface of the hollow carbon body is coated with a resin or the hollow carbon body is impregnated with a resin. It is okay. In this case, as the resin used here, those mentioned above can be mentioned.

[0032]

The present invention has the above-mentioned structure, and since the needle used for medical treatment is formed of a carbon body having a sharpened tip, it is safe by mechanical crushing after using the medical needle. It has the effect that it can be easily crushed to the state or treated very easily by heating such as combustion.

[0033]

EXAMPLES The present invention will now be described in detail based on examples, but the present invention is not limited thereto. FIG. 1 is a perspective view showing an embodiment of a medical needle according to the present invention, that is, a medical injection needle.

This medical injection needle 1 is formed of a cylindrical carbon body having a sharpened tip 1a, and the hollow portion of the cylindrical needle serves as a liquid flow passage 2 for a drug solution, blood, etc. An opening 3 communicating with the liquid flow passage 2 and the outside is formed, while a rear end is opened to form a communication port 4 with the container.

As the medical injection needle 1, a hollow polyester fiber was used, which was sharpened at its tip and then carbonized at 450 ° C.

The hollow polyester fiber used had an outer diameter of about 0.5 mm and an inner diameter of about 0.2 mm.

The medical injection needle 1 thus formed can be easily crushed to a safe state by mechanical crushing after use, or can be treated extremely easily by burning.

FIG. 2 shows another embodiment of the present invention, in which a hollow needle material having a sharpened tip with a mixture of acrylic resin and titanium oxide is obtained and then cured to obtain a medical needle 1. is there.
In this case, the medical needle 1 is linearly formed.

This medical injection needle 1 is formed of a cylindrical carbon body having a sharpened tip 1a, and the hollow portion of the cylindrical needle serves as a liquid flow passage 2 for a drug solution or blood, and the needle tip is An opening 3 communicating with the liquid flow passage 2 and the outside is formed, while a rear end is opened to form a communication port 4 with the container.

In this example, the mixing ratio of the acrylic resin and titanium oxide was 250 parts by weight of ceramics with respect to 100 parts by weight of acrylic resin.

The medical needle 1 has an outer diameter of about 0.5 mm and an inner diameter of about 0.2 mm.

By the way, it was recognized that after the medical needle 1 was combusted, the acrylic resin was carbonized to be mechanically crushed into pieces of powder.

When the medical needle 1 of each of the above-mentioned examples was used for intravenous injection of rats, it was confirmed that there was no problem compared with the metallic medical needle.

[0044]

EFFECTS OF THE INVENTION The present invention has the above-mentioned structure, and since the needle used for medical treatment is formed of a carbon body having a sharpened tip, it can be easily crushed to a safe state or extremely burned. It has the effect of being easily safe and harmless.

[Brief description of drawings]

FIG. 1 is a perspective view of a medical needle showing an embodiment of the present invention.

FIG. 2 is a perspective view of a medical needle according to another embodiment of the present invention.

[Explanation of symbols]

 1 Medical injection needle 1a Tip 1a 2 Liquid flow passage 3 Opening 4 Communication port

Claims (10)

[Claims] 1. A needle used for medical treatment, wherein the needle is formed of a non-metal body having a sharpened tip. 2. The medical needle according to claim 1, wherein the non-metal body is a carbon body, a ceramic body or a mixture of synthetic resin and ceramics. 3. The medical needle according to claim 2, wherein the carbon body is a hollow carbon body having a sharpened tip. 4. The medical needle according to claim 3, wherein the hollow carbon body is formed by carbonizing hollow fibers. 5. The medical needle according to claim 4, wherein the hollow fiber is a hollow polyester fiber or a hollow polyamide fiber. 6. The medical needle according to claim 2, wherein the ceramic body is a hollow ceramic body having a sharpened tip. 7. The medical needle according to claim 2, wherein the mixture of the synthetic resin and the ceramic is hollow and has a sharpened tip. 8. The medical needle according to claim 3, wherein the tip is closed and sharpened, and a side hole communicating with the needle lumen is provided near the tip. . 9. The medical needle according to claim 1, wherein a surface of the carbon body is coated with a resin. 10. The medical needle according to claim 1, wherein the carbon body is impregnated with a resin.