JPH0463709B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a nasal cannula for guiding oxygen gas, concentrated oxygen, etc. (hereinafter referred to as oxygen gas) used in oxygen therapy etc. to a patient. be.

[Conventional technology]

Generally, the temperature of the environment inside the nostrils or airways is 37°C.
(body temperature) and 100% humidity, and it is desirable to use oxygen gas that is close to these conditions for oxygen therapy, etc. However, when oxygen gas with 100% humidity at a temperature higher than room temperature is flowed into the introduction tube or the nostril insertion part (hereinafter referred to as the nasal cannula),
The oxygen gas is cooled by the outside air and the nasal cannula,
Water droplets form especially in the introduction tube. Over a long period of time, these water droplets become large enough to block the channel inside the introduction tube, or even worse, the water is sent to the nostril insertion site, causing water to flow into the nostrils or airways. This can lead to blockage and difficulty breathing.

Conventionally, methods have been used to humidify the air near the nose, to prevent the temperature of the oxygen gas from rising above room temperature, or to reduce the humidity of the oxygen gas to a level that does not cause condensation. However, in this method, the humidifier must be placed near the patient, making the structure of the device complicated and difficult for the patient to use. In addition, the method of . has the disadvantage that the temperature and humidity of the oxygen gas are different from the environment in the nostrils and airways, causing discomfort to the patient.

[Purpose of the invention]

The present invention solves the problem of conventional nasal cannulae, which cannot supply oxygen gas at 100% humidity close to body temperature to patients for a long period of time due to condensation, etc.
The purpose of this invention is to provide a method for using a nasal cannula that has a simple and compact device structure and can stably supply oxygen gas under ideal conditions for a long period of time without causing discomfort to the patient. .

[Structure of the invention]

That is, the present invention provides a π-shaped nostril insertion section having two branch tubes, a mounting tube connected to the nostril insertion section and branched to the left and right, and an 8-shaped mounting tube that bundles the two mounting tubes.
It consists of a square-shaped fastener, and one introduction tube for connecting the two mounting tubes and the oxygen gas supply device to introduce oxygen gas, and the lumen conduit of the introduction tube is connected to the partition wall and the fin. The central passage is divided into a central passage through which oxygen gas flows from the oxygen gas supply device, and one or more peripheral passages surrounding the central passage through which a fluid having a temperature higher than the oxygen gas flows. It is a nasal canyula characterized by

Below, FIGS. 1 and 2 show one embodiment of the present invention.
This will be explained according to the diagram. The nostril insertion part 1 of the nasal cannula according to the present invention is composed of two parallel branch pipes 6 that are directly inserted into the nostrils, and one main pipe 7 that introduces oxygen gas from the mounting tube 2 connected to both ends. The pipe has a π-shaped shape. The main tube 7 may have a certain degree of hardness so that the channel does not collapse even if it is pressed, but the branch tube 6, which is inserted directly into the nostril, is made of a relatively soft material so as to alleviate the discomfort during insertion as much as possible. It is preferable to make it with In addition, the mounting tube 2 has a nostril insertion portion 1.
It serves to introduce oxygen gas into the body and to stably fix the nostril insertion part 1. Two tubes branching from the main tube 7 to the left and right are attached around the patient's head, and a figure-8 shaped clasp is attached to the tube. By sliding the tool 3, it is tightened and fixed according to the size of the head. The structure of such a mounting part consisting of the nostril insertion part 1, the mounting tube 2, and the fastener 3 is well known, and in the present invention, a commonly used structure may be used.

The attachment tube 2 of the nasal cannula attachment part shown in FIG. 1 is connected to the branch part 4 of the introduction tube 5 shown in FIG. The structure of the branch part 4 is not particularly limited in shape, whether it is a π-type or a Y-type, as long as it can connect the two mounting tubes 2 to the introduction tube 5.

The lumen channel of the introduction tube 5 has a cross-sectional shape as shown in FIG. It is divided into three or more peripheral passages. The number of fins 9 is not particularly limited as long as they can stably support the partition wall 8, but it is appropriate to set the number to about 1 to 5.
Further, the branch part 4 is located at the central part of the introduction tube 5.
This is for branching and connecting the passageway 10 into two installation tubes 2, and normally a separately prepared part is attached and fixed to the tip of the introduction tube 5 by adhesive, welding, etc. There is no problem in using it as an independent component without fixing it.

Oxygen gas used for oxygen therapy and the like is passed through a passage 10 at the center of the introduction tube 5, and a passage 11 at the periphery is provided so as to surround the passage 10 at the center divided by a partition wall 8. A fluid such as water, air, or nitrogen gas (hereinafter referred to as a heating element) whose temperature is higher than that of oxygen gas is passed through. The partition wall 8 that separates the flow of oxygen gas and the flow of heated fluid serves as a heat transfer surface to heat or keep the oxygen gas warm, thereby preventing dew condensation in the passageway that leads the oxygen gas, and even during long-term use. Water does not remain in the gas passage, allowing a stable supply of oxygen gas.

When the peripheral passage 11 is divided into two or more independent passages by the fins 9, it is not necessarily necessary to flow the heating fluid through all the passages; It can also be used to flow heating fluid and run cables through the remaining passages to transmit various vital signs detected from the patient. In addition, when using a gas such as air or oxygen gas as the heating fluid, it is discharged into the atmosphere from the opening 12 of the peripheral passage 11 at the tip of the introduction tube 5, that is, around the branch part 4. However, especially when a liquid such as hot water is used as the heating fluid, a return path to return to the hot water supply device is required. The remaining passage can be used as a return trip. In this case, the two openings 12 may be connected to each other using a connecting tube or the like whose ends are made to match the shape of the opening 12, and the liquid will flow back in the opposite direction to the oxygen gas. .

If the length of the mounting tube 2 is too long, breathing gas will be cooled and condensation will occur.If the length of the mounting tube 2 is too short, the position of the opening 12 will be close to the nostril, and an inert gas such as nitrogen gas may be used as the heating fluid. If the patient is using a
It is desirable to set it to about 1 m.

On the other hand, the length of the introduction tube 5 is approximately 1 to 2 m when used with the patient lying on the bed, but when used for oxygen therapy at home etc., a nasal cannula is used. You are required to be able to move around indoors while wearing it, and the
It is not uncommon to require a length of m or even longer.

The rear end of the introduction tube 5 is connected to an oxygen gas supply device such as an oxygen concentrator or an oxygen cylinder, and a heating fluid supply device, and both devices are usually integrated and compactly assembled. It is desirable that the connection nozzle with the introduction tube 5 is also integrated into one, but the shape of the connection nozzle may be particularly selected as long as it matches the structure of the rear end of the introduction tube and can be tightly fitted and connected. Not limited.

The material for the mounting tube and the introduction tube is not particularly limited as long as it is flexible at room temperature or the operating temperature of 37°C, but it is easy to find foreign objects or dirt inside the tube. A transparent material is desirable, and examples of such materials that can be used include soft vinyl chloride resin, polyurethane resin, and silicone rubber.

〔Effect of the invention〕

By using the nasal cannula of the present invention, breathing gas can be delivered at or near the patient's body temperature and at 100% humidity, ideal conditions that do not cause discomfort to the patient.
It can be guided stably for a long period of time without condensation, and it also has the advantage of being able to be used by storing it in a tube, for example when installing a cable to transmit vital signs detected from a patient. , which is very useful in the medical industry.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the configuration of an embodiment of the attachment part of the nasal cannula according to the present invention, and Fig. 2 is a diagram showing the structure of the introduction tube of the nasal cannula according to the present invention, where a is the center of the tip of the introduction tube. Sectional view b is a cross-sectional view taken along line A-A' in FIG. 2a. Also,
The arrows in FIG. 2a indicate an example of the flow direction of the oxygen gas and the heating fluid.

Claims (1)

[Claims] 1 π-shaped nostril insertion part with two branch pipes,
A mounting tube connected to the nostril insertion part and branched to the left and right, a figure-8-shaped fastener for bundling the two mounting tubes, and a device for connecting the two mounting tubes and an oxygen gas supply device to guide oxygen gas. It consists of one introduction tube, and the lumen conduit of the introduction tube has a central passage through which oxygen gas flows from the oxygen gas supply device, and a passageway surrounding the central passage and having a height higher than the oxygen gas. 1. A nasal cannula, characterized in that it is divided into one or more peripheral passages for the flow of temperature fluid.