JPH0541688Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a medical needle used for blood sampling, and in particular, to a device that maintains liquid tightness between a needle base and a needle cap.

[Prior Art and Problems with the Prior Art] In medical needles currently in use, the needle base is made of vinyl chloride and the needle cap is made of polypropylene.

In order to maintain liquid-tightness between the needle base and the needle cap, the medical needle is manufactured by applying silicone as a sealant between the needle base and the needle cap, and hardening the silicone using heat from a heat treatment process such as autoclave sterilization. By fixing the needle base and the needle cap, the liquid tightness between the needle base and the needle cap is maintained.

However, the above-mentioned method cannot reliably fix the needle cap to the needle base, and the needle cap often comes off during transportation or storage and becomes unusable.

Additionally, the needle base and blood collection tube are currently glued together using a solvent.

For this reason, when the needle base and blood collection tube are bonded together, the solvent that protrudes from the adhesive surface may remain in the blood collection tube or needle base, or the solvent may dissolve into the blood during blood collection, resulting in blood loss. There was a possibility of hemolysis occurring.

The inventor of the present invention conducted extensive research to solve the above problems, and as a result, he came up with a medical needle that maintains fluid tightness between the needle base and the needle cap, and also prevents the adhesive from eluting.

[Means for Solving the Problems] The present invention is a medical needle 1 used for blood collection, in which a needle cap 3 made of a blend polymer of polypropylene and styrene elastomer is connected to a needle base 2 made of polycarbonate under high pressure. A medical needle 1 is provided which is liquid-tightly bonded by steam sterilization.

[Function] With the above configuration, the needle base 2 and the needle cap 3 can be fixed liquid-tightly by the heat of the heat treatment process such as high-pressure steam sterilization, and the cannula 5 is not exposed to the outside air because it does not easily come off. It is very hygienic because there is no

[Example] FIG. 1 is a schematic diagram of the medical needle of the present invention.

The present invention basically consists of a needle base 2 made of polycarbonate and a needle cap 3 made of a blend polymer of polypropylene and styrene elastomer.

Among the blended polymers of polypropylene and styrene-based elastomer forming the needle cap 3, styrene-based elastomer is an elastomer whose main component is an elastomer having a molecular structure of styrene-ethylene/butylene-styrene, and styrene-butadiene-styrene. It is an elastomer whose main component is an elastomer with a molecular structure.

The preferable ratio of the blend polymer of polypropylene and styrene elastomer forming the needle cap 3 of the present invention is 1/0.7 to 1.3 of polypropylene/styrene elastomer.

Next, the assembly method of the present invention will be explained.

First, adhesive is applied to the base of the cannula 5, and this is attached to the needle base 2. Thereafter, a small amount of alcohol is applied to one end of the blood collection tube 4 and the tube is fitted into the fitting part 6 of the needle base 2. The outer diameter of the blood collection tube 4 is the same as or slightly larger than the inner diameter of the fitting part 6, and by lubricating it with alcohol, the blood collection tube 4 with a different diameter and the fitting part 6 can be fitted. .

Attach the needle cap 3 to the needle base 2 assembled as above.
Attach and heat-treat by high-pressure steam sterilization, etc.
This heat melts the ethylene elastomer of the needle cap 3 and seeps into the liquid-tight surface of the needle cap 3 of the needle base 2.

After sterilization is completed, when the temperature returns to room temperature, the styrene elastomer solidifies, and the gap between the needle cap 3 and the needle base 2 becomes completely liquid-tight.

Furthermore, when using the present invention, the needle cap 3 can be easily removed by simply turning it by hand in the same way as conventional medical needles, and the gap between the needle cap 3 and the needle base 2 becomes liquid-tight. Therefore, the cannula 5 is hygienic.

[Effects] As explained above, the present invention maintains liquid tightness between the needle cap 3 and the needle base 2 for a long period of time by forming the needle cap from a blend polymer of polypropylene and styrene elastomer. Furthermore, the needle cap 3 is less likely to come off naturally during transportation or storage, and the cannula is not exposed to the outside air, making it hygienic.

In addition, since the needle base 2 of the present invention is made of polycarbonate, there is no need to use a solvent when connecting the needle base 2 and the blood collection tube 4. Therefore, there is no need to use a solvent when connecting the needle base 2 and the blood collection tube 4. It is less likely to cause toxicity to component cells in the blood.

This is an excellent idea that has the following effects.

[Brief explanation of the drawing]

FIG. 1 shows a schematic diagram of the medical needle of the present invention. In the figure, 1 is a medical needle, 2 is a needle base, 3 is a needle cap, 4 is a blood collection tube, 5 is a cannula, and 6 is a fitting part.

Claims (1)

[Scope of utility model registration request] A medical needle used for blood collection, characterized in that a needle cap made of a blended polymer of polypropylene and styrene elastomer is liquid-tightly adhered to a needle base made of polycarbonate by high-pressure steam sterilization. Medical needle.