JPH019565Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in an aeration needle that is inserted together with a liquid guide needle into a stopper of a container filled with various medical infusions.

In general, this type of ventilation needle is used to puncture the stopper of a container when injecting various infusions such as amino acids, vitamins, other nutrients, hemostatic agents, anesthetics, etc. into the veins of a living body. , is used to introduce infusion fluid into an infusion device connected to a fluid guide needle by introducing outside air into an inverted container.

Conventionally, as illustrated in FIGS. 1 and 2, an infusion device 3 is attached to a stopper 2 of a container 1 filled with an infusion solution.
A ventilation needle 5 punctured together with a liquid guide needle 4 connected to
is usually formed of a needle part 6 and a cylindrical body part 7 having a base part 7a at one end into which the needle part 6 is inserted and fixed, and a ventilation passage on the other end side of the opening of the body part 7. It is well known that an air filter 8 made of a hydrophobic substance is provided to collect bacteria, floating dust, etc. in the outside air.

However, with such a conventional structure, when the container 1 is in an inverted position and the infusion is started, the clamp 3a of the infusion device 3 is closed and the inside of the container is under positive pressure, so ventilation is not allowed in this state. As soon as the needle 5 is inserted into the stopper 2 of the container 1,
The infusion fluid flows into the ventilation needle (indicated by the dotted arrow in Figure 2), temporarily blocking the ventilation passage, and then, when the clamp 3a is opened, the pressure inside the container gradually decreases, causing the inside of the ventilation needle to flow. The infusion fluid flows back into the container due to the introduction of outside air (indicated by the solid arrow in Figure 2).
For this reason, not only bacteria or floating dust in the outside air adhering to the air filter 8 installed in the ventilation path of the ventilation needle get mixed into the container, but also the infusion liquid that has permeated the air filter 8 tends to leak to the outside. When the filter 8 got wet, the introduction of outside air became unstable, which caused various problems such as an adverse effect on the dripping rate and flow rate of the infusion solution.

This invention was aimed at solving the above-mentioned conventional drawbacks, and the gist of this invention is to provide a ventilation needle consisting of a cylindrical body in which the needle is inserted and fixed into the open base at one end. The body is formed of a U-shaped bent tube body, and the outside air inlet opening toward the top of the tube is narrowed into a narrow mouth. It is characterized by being equipped with a filter.

Next, this invention will be explained based on the embodiment shown in FIG. 3. In the figure, numeral 11 is a ventilation needle body. The ventilation needle main body 11 is composed of a needle portion 12, a base member 13 for fixing the needle portion 12, and a cylindrical body portion 14 with one end of the base member 13 inserted and fixed into the opening 14a side. There is. The body 14 is formed of a tube bent into a U-shape, and the other end of the body has an opening 14b that opens upward and serves as an outside air introduction port, and the outside air introduction port 15a is connected to the base. The air is narrowed into a narrow shape via an outside air introducing member 15 integrated with the member 13. Further, reference numeral 16 in the figure is an air filter provided at the open end 15b of the outside air introduction member 15 forming the outside air introduction port.

Therefore, according to the above-mentioned configuration according to this invention, when the needle part is punctured into the stopper part of the container which is in an upside down state during the initial start operation of dripping an infusion, the infusion in the container temporarily flows into the cylindrical body. The body flows into the body.
Since it is formed of a curved tubular body in the shape of a letter, and its outside air inlet is narrowed into a narrow mouth, the infusion is stopped on its way to the outside air inlet. As soon as the clamp of the device is opened, the infusion in the body can completely flow back into the container at once, which not only prevents leakage as in the conventional case, but also prevents the air filter from getting wet. The air filter itself is highly practical, as it can be freely selected whether it is hydrophilic or hydrophobic. It is effective.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the usage state of a conventional infusion vent needle, Fig. 2 is an explanatory diagram showing the backflow phenomenon of infusion fluid flowing into the vent needle, and Fig. 3 is an explanatory diagram showing the infusion vent needle according to this invention. FIG. 2 is a sectional view showing one embodiment of the invention. 11... Ventilation needle body, 12... Needle part, 13...
Base member, 14... Body part, 14a, 14b... Opening end, 15... Outside air introduction member, 15a... Mouth part,
15b...Open end, 16...Air filter.

Claims (1)

[Scope of utility model registration request] A ventilation needle consisting of a cylindrical body with a needle inserted and fixed into an opening base at one end, the body being formed of a U-shaped bent tube, and an outside air introduction port opening upwards of the tube. As the part is narrowed down to a narrow shape,
A ventilation needle for infusion, characterized in that an air filter is provided on the open end side of the outside air introduction port.