JPH06105873A - Oxygen tent - Google Patents

Abstract

PURPOSE:To provide an oxygen inhalator capable of concentrating and circulating oxygen in air without supplying oxygen from the outside in such a state that a patient is received in a hood to keep the desired concn. of oxygen and that of carbon dioxide. CONSTITUTION:A patient is received in a hood 1 and an oxygen concentrator 10 is arranged to concentrate oxygen in the circulating air in the hood 1. An open air sending-in means 13 and a sent-in open air flow rate controller 14 are arranged to hold the concn. of oxygen in the air in the hood 1 to a desired value. A carbon dioxide separator 6 or a carbon dioxide adsorbing device is arranged to discharge carbon dioxide in the exhalation of a patient. By this constitution, the necessary concn. of oxygen and that of carbon dioxide can be held without supplying oxygen of an oxygen cylinder.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a medical respiratory aid.

[0002]

2. Description of the Related Art Currently used oxygen tents suck air in a hood containing a patient by a circulation fan, cool or heat it by a heat exchanger, add oxygen at a set flow rate, and humidify it. After that, it is composed of a circulation circuit for sending to the hood, and adjusts the temperature and oxygen concentration of the temperature inside the hood.

[0003]

In the oxygen tents currently used, the oxygen concentration in the hood is normally maintained at about 50% by supplying 10 l / min of oxygen. This means that the outside air, which is more than twice the supply oxygen flow rate, is mixed into the hood for various reasons, and the supply oxygen flow rate + the mixed outside air volume enters and leaves the hood as the ventilation volume of the air in the hood. .
Even so, the carbon dioxide concentration in the hood is about 0.7%, which is considerably higher than the public health standard of 0.1%.

[0004] In the system such as the present oxygen tent that relies on ventilation for carbon dioxide emission, maintaining a high oxygen concentration at a low oxygen flow rate and keeping a low concentration of carbon dioxide gas exhaled by a patient. Are conflicting requirements.

The use of oxygen tents in home care, which has been increasing in recent years, requires an oxygen cylinder or a liquefied oxygen cryocontainer as an oxygen supply source. Since they are heavy and are high-pressure gases, they are dangerous to handle, and there is the inconvenience that the containers need to be replaced when they are consumed.

[0006]

[Means for Solving the Problems] Recently developed oxygen concentrators include those utilizing an oxygen permeable membrane and those utilizing a nitrogen adsorbent such as zeolite for regeneration by a pressure swing method. Since about 21% of oxygen in the atmosphere is sampled, the discharge flow rate of oxygen is small compared to the size of the device and it cannot be used for an oxygen tent.

If the air in the oxygen tent hood is repeatedly circulated in the oxygen concentrator, the oxygen concentration of the air taken in by the outside air of the oxygen concentrator is gradually increased to 21% instead of 21%. The amount of oxygen discharged from the oxygen concentrator increases by that amount, which also increases the oxygen concentration of the intake air of the oxygen concentrator. With this configuration, the oxygen concentration in the hood can be kept high without supplying oxygen from the outside. In order to keep the oxygen concentration constant, the calculated amount of outside air is fed into the circulation circuit, and excess air is discharged to the outside from the joint between the patient and the hood.

The carbon dioxide gas exhaled by the patient is removed not by the conventional ventilation system of an oxygen tent, but by installing a carbon dioxide gas separator composed of a membrane that permeates only carbon dioxide gas in the circulation circuit of the air in the hood. Carbon dioxide gas is discharged due to the pressure difference of the pump. Alternatively, a plurality of carbon dioxide adsorbing vessels filled with carbon dioxide adsorbing material are arranged in parallel, and the air in the hood constantly circulates in one of the adsorbing vessels to adsorb the carbon dioxide gas and discharge it to the other adsorbing vessel. Connect the pump to regenerate the adsorbent.
By repeating the adsorption and regeneration alternately to adsorb and remove carbon dioxide continuously, only carbon dioxide is selectively discharged.

[0009]

EXAMPLES Examples will be described with reference to the drawings. 1, the patient is housed in the hood. The air in 1 hood passes through 2 suction pipes, 4 heat exchangers, 5 blowers, and is accelerated and sent to 6 carbon dioxide separators. 7 discharge pump
Due to the pressure difference between the separation membrane and the carbon dioxide, carbon dioxide gas is eliminated, and it is connected to the humidifier 8.

Air from 9 passages connected to 1 hood is connected to 11 outside air intake ports of 10 oxygen concentrator, and oxygen concentrated by removing nitrogen by 10 oxygen concentrator is discharged from 12 concentrated oxygen outlet. Is released.

The air from the outside air inlet pump is 14
Adjust the flow rate controller to the outside air inflow rate calculated according to the set value of oxygen concentration in the hood, merge with concentrated oxygen, and
Enter the humidifier, join the air from the 6 carbon dioxide gas separator, and return to 1 hood via 3 delivery pipes.

The outside air inlet pump is simply 12
The venturi-based ejector connected to the concentrated oxygen outlet can be replaced with the 14 flow controller by an external air intake controller of the ejector.

15 temperature sensors, 16 humidity sensers, 1
The measured values of 7 oxygen sensor and 18 carbon dioxide sensor are
It is processed by an electronic circuit, displayed on the operation board, compared with the set value, and controlled.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an oxygen tent according to the present invention.

[Explanation of symbols]

1 Hood 15 Humidity Sensor 2 Suction Pipe 16 Humidity Sensor 3 Delivery Pipe 17 Oxygen Sensor 4 Heat Exchanger 18 Carbon Dioxide Gas Sensor 5 Blower 6 Carbon Dioxide Separator 7 Exhaust Pump 8 Humidifier 9 Passage 10 Oxygen Concentrator 11 Outside Air Intake 12 Concentrated oxygen outlet 13 Outside air pump 14 Flow controller

Claims (1)

[Claims] 1. A circulation circuit that connects to the air in a hood containing a patient, connects the outside air intake of the oxygen concentrator, and connects the concentrated oxygen outlet of the oxygen concentrator into the hood, and the circulation circuit. An oxygen tent characterized in that a means for sending outside air into the inside and a means for adjusting the amount of the outside air inserted therein are installed to control the oxygen concentration of the air in the hood to be constant.