JPS6344041Y2 - - 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.

Generally, this type of ventilation needle is used when injecting various infusions such as amino acids, vitamins, other nutrients, hemostatic agents, anesthetics, etc. into the veins of a living body.
It is used to introduce an infusion into an infusion device connected to a liquid guide needle by inserting the needle into the stopper of the container and introducing outside air into the 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, various problems occurred, such as making the introduction of outside air unstable and adversely affecting the dripping rate and flow rate of the infusion.

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 with a needle inserted and fixed into the base at one end. The inside of the unit is divided into a closed space for storing infusion solution, which the insertion end of the needle part faces, and a ventilation space, which communicates with the outside air, and an air filter is provided in the middle of the ventilation path of the ventilation space. That is.

Next, this invention will be explained based on the embodiment shown in FIGS. 3 and 4.

FIG. 3 shows a first embodiment of this invention, in which reference numeral 11 indicates a ventilation needle body. The ventilation needle body 11 includes a needle portion 12 and a base portion 1 into which the needle portion 12 is inserted and fixed.
3a at one end, and an opening 13b at the other end of the body 13.
A cap-shaped stopper 14 is fitted and fixed to the. A cylindrical portion 15 facing into the body portion 13 is formed in the plug body 14, and a tip opening 15a of the cylindrical portion 15 faces the insertion end 12a of the needle portion 12.
On the other hand, the middle of the lower end side is closed by a partition wall 16 to form a closed space 17. The closed space 17
The function is to accommodate the infusion that flows in when the needle portion 12 is inserted into the stopper of an inverted container filled with an infusion. Further, a ventilation hole 18 is bored on the lower end opening 15b side of the cylinder located below the partition wall 16 that forms the closed space 17, and the ventilation hole 18 is inserted into the inner circumferential wall of the body 13. 131 and the outer circumferential wall surface 151 of the cylindrical portion 15, the outside air is introduced into the body portion 13 from the lower end opening 15b of the cylindrical portion 15, and the gap 19 is ventilated. It has a configuration in which the space section is formed separately from the closed space section 17. Further, reference numeral 20 in the figure is an air filter provided at the lower end opening 15b of the cylindrical portion 15, which is capable of collecting bacteria, floating dust, etc. in the outside air.

FIG. 4 shows a second embodiment of this invention,
The means for forming the closed space 17 and the ventilation space 19 and the ventilation structure in the first embodiment are improved, and the entire cylindrical part 15 is made into a ventilation structure to form the ventilation space 19, and the opening at the tip thereof is improved. 15a is provided with an air filter 20 to shift it from the axis a of the needle part 12, and the insertion end 12a of the needle part 12 is made to face the outer peripheral space of the cylindrical part 15, making this space a closed space part 17. It is something.

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 upside down at the time of starting the infusion dripping, the infusion liquid in the container is divided from the needle part into the body part. Since the infusion fluid flows into the closed space and is stored there, and does not flow into the ventilated space, the air filter does not get wet due to infusion fluid flowing in, unlike in the conventional case, and bacteria or floating dust in the outside air can be stored in the container. It is practical, as it can reliably prevent contamination from entering the bloodstream, prevent infusion fluid from leaking, and allow a stable introduction of outside air.Furthermore, the air filter itself can be freely selected, whether it is hydrophilic or hydrophobic. It has excellent effects.

[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. A sectional view showing the first embodiment of the fourth embodiment.
The figure is a sectional view showing a second embodiment of this invention. 11... Ventilation needle body, 12... Needle portion, 12a...
...insertion end, 13...body, 13a...base, 14
... Plug body, 15 ... Cylinder part, 16 ... Partition wall, 17 ...
...Closed space part, 18...Vent hole, 19...Ventilation space part, 20...Air filter.

Claims (1)

[Scope of utility model registration request] In a ventilation needle consisting of a cylindrical body with a needle inserted and fixed into the base at one end, the inside of the body is divided into a closed space for infusion storage, which the insertion end of the needle faces, and a ventilation space that communicates with the outside air. 1. A ventilation needle for infusion, characterized in that the needle is divided into two parts, and an air filter is provided in the middle of the ventilation path of the ventilation space.