JPH0119946Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an air needle that uses a hypodermic needle.

[Background of the idea]

The air needle is used by inserting it into the rubber stopper of a Bayer bottle that is hung upside down to adjust the air inside the bottle when performing medical treatment by connecting a blood transfusion or infusion drip set to a Bayer bottle. This allows the blood or drug solution in the bottle to flow down naturally through the liquid conduit of the drip set. This air needle is used for the above purpose, but if air is simply supplied into the bottle, there is a risk that various impurities floating in the atmosphere will be dissolved or mixed into the blood or drug solution in the bottle. The needle is always equipped with a filter to remove the above impurities. Therefore, air needles that require such functions cannot be replaced with general injection needles.
Conventionally, they were manufactured as accessories exclusively for blood transfusions or infusion drip sets. As an example of this,
There is a publication number 92946. In order to prevent the filter from getting wet due to the blood or drug solution in the bottle flowing back into the needle during an infusion and making it impossible to supply air, the filter is double-layered and one of the filters is made water-repellent. However, when faced with a situation where the filter needs to be replaced, there is a problem in that there is no alternative. Of course, it is possible to stock spare air needles, but there is a problem in that the specially designed air needles are expensive.

[Purpose of invention]

This invention is intended to solve the above-mentioned problems, and aims to provide an inexpensive air needle that uses a general injection needle.

[Structure of the idea]

In order to achieve the above object, this invention includes a hypodermic needle body, a disc-shaped filter that covers the open end of the needle base of the hypodermic needle body, and a ring-shaped member that fixes the disc-shaped filter to the collar of the needle base. , the ring-shaped member is composed of a perforated plate and a body part, the perforated plate has a protrusion that presses the plate-shaped filter downward, and the body part has an annular protrusion that can be latched to the lower surface of the flange body. It is configured as follows.

〔Example〕

Next, this invention will be explained based on an embodiment shown in the accompanying drawings.

1 is a known injection needle body, and the injection needle body 1 consists of a needle body 2 and a needle base 3. A flange 4 is provided on the outer periphery of the opening end of the needle base 3 to provide finger grip and strength when connected to a nozzle portion at the tip of a syringe (not shown).

Reference numeral 5 denotes a ring-shaped member made of soft synthetic resin that can be covered with a collar body 4 provided around the outer periphery of the opening end of the needle hub 3, and the ring-shaped member 5 has an inner diameter that is approximately equal to the outer diameter of the collar body 4. A perforated plate 5b having a protruding portion 5b' for pressing downwardly a disk-shaped filter to be described later, and an annular protrusion 5c that can be engaged with the lower surface of the flange 4. The distance 1 between the perforated plate 5b of the ring-shaped member 5 and the annular projection 5c is determined by the thickness of the collar body 4 of the needle base 3 plus the thickness of the disc-shaped filter 7. Further, the protruding portion 5b' of the perforated plate 5b that presses the plate-like filter 7 is formed on the perforated plate 5 as shown in FIG. 2A.
The perforated plate 5b itself may be curved inward, or the perforated plate 5b may have protrusions on its outer periphery as shown in FIG.

Note that the perforated plate 5 constituting the ring-shaped member 5
In the illustrated case, one through hole 6 is provided corresponding to the open end of the needle base 3, but a plurality of through holes may be provided in a grid pattern or radially.

Reference numeral 7 denotes a disc-shaped filter fixed to the opening end surface of the needle base 3 by a protrusion of the perforated plate 5b of the ring-shaped member 5 which is covered with the collar body 4 of the needle base 3; As long as it is disc-shaped, it may be a cloth-like material such as a membrane filter, a plate-like material such as sintered nylon, or a felt-like material formed by laminating fibers.

[Effect of idea]

As explained above, this invention includes a hypodermic needle body, a disc-shaped filter that covers the open end of the needle base of the hypodermic needle body, and a ring-shaped member that fixes the disc-shaped filter to the collar of the needle base. The ring-shaped member is composed of a perforated plate and a body part, the perforated plate has a protrusion that presses the plate-shaped filter downward, and the body part has an annular protrusion that can be latched to the lower surface of the flange body. Therefore, the ring-shaped member can be freely attached and detached, and the disc-shaped filter can be reliably fixed to the opening end surface of the needle hub by the protrusion of the perforated plate and the annular projection of the body. Therefore, the opening end surface of the needle base and the plate-shaped filter are in close contact with each other, and no gap is formed, completely preventing the intrusion of dust, etc. in the air, and a commonly used inexpensive injection needle can be used as an air needle. Is possible. Furthermore, if you are faced with a situation where the filter needs to be replaced due to an accident where blood or drug solution flows back into the needle and wets the filter during IV drip administration, you can simply prepare a new disc-shaped filter. It can be used as a substitute and has various excellent effects.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being an enlarged sectional perspective view, FIGS. 2A and B being sectional views of the ring-shaped member, and FIG. 3 being a sectional view showing the state of use. 1... Injection needle body, 2... Needle body, 3... Needle base,
4... Flange body, 5... Ring-shaped member, 5a... Perforated plate, 7... Disc-shaped filter.

Claims (1)

[Scope of utility model registration request] It comprises a hypodermic needle body, a disc-shaped filter that covers the open end of the needle base of the hypodermic needle body, and a ring-shaped member that fixes the disc-shaped filter to the flange of the needle base, and the ring-shaped member is a perforated plate. An injection needle comprising a body, the perforated plate having a protrusion that presses the disc-shaped filter downward, and the body having an annular protrusion that can be engaged with the lower surface of the collar body. Air needle using.