JPH019567Y2 - - 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 so that bacteria, floating dust, etc. in the outside air can be collected.

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 path, and then when the clamp 3a is opened, the pressure inside the container gradually decreases and the ventilation needle closes. The infusion solution inside the container flows back into the container due to the introduction of outside air (indicated by the solid line 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 aims to eliminate the above-mentioned conventional drawbacks, and its gist is that the needle is inserted and fixed into the base at one end, and an air filter is installed at the open end of the outside air inlet at the other end. In the ventilation needle having a cylindrical body, a cylindrical partition with a closed tip that partitions between the air filters is provided in the body, and a ventilation hole is opened on the peripheral side of the tip of the partition. In addition, the vent hole can be closed by a float provided on the partition body so as to be able to float freely when the infusion fluid flows in due to the puncture of the needle portion into the infusion solution enclosure.

Next, this invention will be explained based on an embodiment shown in FIG. 3. In the figure, numeral 11 is a ventilation needle body.
The ventilation needle main body 11 includes a needle portion 12, a cylindrical body portion 13 having a base portion 13a at one end into which the needle portion 12 is inserted and fixed, and an outside air inlet opening at the other end of the body portion 13. 13b through a fixing member 14, and a cylindrical partition 16 is provided inside the body 13. The partition body 16 has a flange portion 16a that comes into contact with the opening peripheral end surface on the other end side of the body portion 13, a tapered pipe portion 16b, and a tubular tip portion 16c. Tip part 16c
is closed by forming a flange 16d, and has a ventilation hole 17 opened on its circumferential side, and is arranged so as to partition the air filters 15 in the body 13. And 18 in the figure
is a float, which is provided at the tip 16c of the partition wall body 16 so as to be able to float freely, and the upper limit of its floating is above the flange 1.
6d, and the vent hole 17 is closed in the floating state.

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 infusion fluid, the infusion fluid in the container temporarily flows into the body. The inside of the body is partitioned by a cylindrical partition wall between the air filters provided on the outside air inlet side, and the ventilation hole opened at the tip of the partition wall is closed by the floating action of the float. This prevents the infusion solution from leaking outside, and it is possible to reliably prevent bacteria in the outside air or floating dust from entering the container due to the air filter getting wet. The filter itself can be freely selected, regardless of whether it is hydrophilic or hydrophobic, and the infusion fluid that has flowed in can be completely returned to the container by flowing back into the container as soon as the clamp of the infusion device is opened. ,
After the infusion liquid flows back, the float is released from its floating state due to the infusion liquid and falls under its own weight, so that outside air can be introduced smoothly, which has excellent practical effects.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing how a conventional infusion vent needle is used, 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...
Body, 13a...base, 13b...outside air inlet,
14...Fixing member, 15...Air filter, 1
6...Partition body, 16c...Tip, 17...Vent hole, 18...Float.

Claims (1)

[Scope of utility model registration request] In a ventilation needle consisting of a cylindrical body in which a needle is inserted and fixed at one end of the base and an air filter is provided at the open end of an outside air inlet on the other end, a tip part is provided in the body to partition between the air filters. A closed cylindrical partition body is provided, a ventilation hole is opened on the circumferential side of the distal end of the partition body, and the ventilation hole is
1. A ventilation needle for an infusion solution, characterized in that the infusion solution can be closed by a float provided on the partition body so that the infusion solution can float freely when the infusion solution flows into the infusion solution enclosing container as the needle part punctures the container.