JP7406681B1 - high flow system - Google Patents

Abstract

The present invention provides a high-flow system used in high-flow therapy, which can apply high PEEP and can be applied to patients with many pulmonary function conditions. The high flow system includes a flow generator 50 that generates a gas mixture of oxygen and air, a gas supply pipe 55 connected to the flow generator 50, and one end connected to the gas supply 55 and the other end. The mask 200 includes a nasal cannula 100 that is attached to the user's nose, and a mask 200 that covers the user's mouth and nose with a gap formed therebetween. is provided, the tube 101 of the nasal cannula 100 is inserted airtightly, the nasal tube of the nasal cannula 100 is placed in the gap between the user's mouth and nose, and the pressure in the gap is adjusted through the exhalation port 213. A pressure adjustment unit W is attached to maintain the pressure in the cavity at a predetermined pressure. [Selection diagram] Figure 1

Description

The present invention relates to a high-flow system and a pressure adjustment unit, and the present invention relates to a high-flow system and a pressure adjustment unit used, for example, in high-flow therapy, which supplies a gas mixture of oxygen and air to a user through a nasal cannula attached to the user's nose. The present invention relates to a pressure adjustment unit used in a high flow system.

In recent years, high-flow therapy (high-flow oxygen therapy), which supplies gas containing high concentration of oxygen to a user (patient) at a high flow rate via a nasal cannula attached to the user's (patient) nose, has become widespread. For example, Patent Document 1 discloses a high-flow gas insufflation device used for high-flow therapy.

The high-flow gas blowing device described in Patent Document 1 includes a device main body and a breathing circuit (blow tube) connected to the device main body to feed gas to a user. In addition, a nasal cannula that is attached to the user's nose is connected to the end of the breathing circuit, and a high flow rate of "oxygen-containing gas" is delivered to the user through the nasal cannula. .

In addition, the device used in the high flow system as described above is also sold by the applicant of the present application, Kafuventec Co., Ltd., and the product information is introduced on the website provided by Kafuventec Co., Ltd. (Non-Patent Document 1). is also disclosed.

JP 2019-141195 Publication

Cafventec Co., Ltd. website, "Product information > Web page presenting high flow therapy", [Searched on June 27, 2022], Internet <URL https://www.c-ventec.jp/project-cat/flo/ >

However, the devices used in the conventional high-flow therapy described above (the high-flow gas insufflation device described in Patent Document 1 and the device described in Non-Patent Document 1) have a PEEP (positive end-expiratory pressure) of 2 to 4 cmH. The problem is that the number of patients to whom it can be applied is limited because it only costs about ₂₀ minutes. Currently, Non-Invasive Positive Pressure Ventilation (NPPV), which can deliver PEEP, is used for patients with poor lung conditions who require PEEP, which is difficult to handle with HFNC. However, NPPV does not have the effect of reducing the ventilation volume and reducing the burden on the lungs due to the dead space flushing effect obtained with HFNC. Therefore, if it becomes possible to load and control PEEP, which is expected to be clinically effective, while reducing the ventilation volume and reducing the burden on the lungs while using HFNC, more lung-protective respiratory management will become possible. In addition, in the current medical practice, patients with poor lung conditions must be treated with ventilators, which place a physical burden on the patient. Another problem with ventilators is that they place a heavy burden on medical personnel.

The present invention has been made in view of the above problems, and its purpose is to provide a high-flow system for use in high-flow therapy, which applies clinically significant PEEP while reducing ventilation volume through the flushing effect of dead space. The objective is to provide a high flow system that can be applied to patients with many pulmonary function conditions. Another object of the present invention is to provide a pressure adjustment unit used in the high flow system.

The present invention, which was made to solve the above problems, is a high-flow system used in high-flow therapy, which includes a flow generator that generates and supplies a gas mixture of oxygen and air, and a flow generator connected to a gas inlet of the flow generator. a nasal cannula whose one end is connected to the gas supply pipe and whose other end is attached to the user's nose, and a gap is formed between the user's mouth and nose. a mask that covers the user's mouth and nose, and the mask is provided with an exhalation port, and the tube of the nasal cannula is inserted airtightly into the gap between the user's mouth and nose. A nasal tube of the nasal cannula worn by the user is disposed, and a pressure adjustment unit is attached to the exhalation port to adjust the pressure in the cavity so that the pressure in the cavity is maintained at a predetermined pressure. It is characterized by being

As described above, according to the high flow system of the present invention, a pressure adjustment unit that adjusts the pressure in the gap formed between the mask and the user's mouth and nose is connected to the exhalation port provided in the mask, The pressure in the cavity is maintained at a predetermined pressure.
According to this configuration, it is possible to apply an arbitrary PEEP set to a user to whom gas is supplied by the high flow system of the present invention. As a result, according to the present invention, the number of applicable patients can be expanded compared to devices used in conventional high-flow therapy (the high-flow gas insufflation device described in Patent Document 1 and the device described in Non-Patent Document 1). can be expected. Moreover, since the high-flow system of the present invention can be used for patients with severe lung conditions, it can be expected to reduce the need to use a ventilator, which is a burden on both patients (users) and medical personnel.

The pressure adjustment unit also includes a T-tube adapter attached to the exhalation port of the mask, a pressure adjustment valve connected to the tip of the T-tube adapter, and a branch pipe section of the T-tube adapter. and a safety valve to avoid difficulty in inhaling due to negative pressure inside the mask when the user's inhalation flow rate exceeds the flow rate of the medical gas supplied from the high flow system, and the pressure adjustment Preferably, the valve maintains the pressure in the cavity at a predetermined pressure.
In this way, the pressure adjustment unit of the present invention is constructed of relatively simple parts, and can solve the problems of conventional high flow therapy without causing a significant increase in cost.

According to the present invention, the high-flow system used in high-flow therapy is capable of applying clinically significant PEEP while reducing the ventilation volume due to the flushing effect of dead space, and is applicable to patients with many pulmonary function conditions. We can provide a high flow system that can. Moreover, according to the present invention, a pressure adjustment unit for use in the high flow system can be provided.

1 is a schematic diagram showing the configuration of a high flow system according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a state in which a pressure adjustment unit is removed from a mask constituting a high flow system according to an embodiment of the present invention. FIG. 2 is a schematic diagram for explaining the configuration of a pressure adjustment unit that adjusts the pressure of a gap formed inside a mask that constitutes a high flow system according to an embodiment of the present invention.

Hereinafter, a high flow system according to an embodiment of the present invention will be described based on the drawings.

《Overall configuration of high flow system》
First, the overall configuration of the high flow system of this embodiment will be explained using FIGS. 1 and 2.

The high-flow system of this embodiment includes a flow generator (hereinafter simply referred to as "flow generator") 50 with a built-in heating and humidification function that generates and supplies "a gas (pressurized gas) that is a mixture of oxygen and air" to the patient (user). , a gas supply pipe 55 connected to the gas supply port 51 of the flow generator 50, a nasal cannula 100 having one end connected to the gas supply pipe 55 and the other end attached to the user's nose; The mask 200 covers the mouth and nose while forming a gap between the mouth and nose.
The mask 200 is also provided with an exhalation port 213, and the tube 101 of the nasal cannula 100 is airtightly inserted into the gap between the user's mouth and nose. A nasal tube is placed.

Further, a pressure adjustment unit W is attached to the exhalation port 213 of the mask 200 to adjust the pressure in the gap formed between the mask 200 and the user, and the pressure in the gap is maintained at a predetermined pressure. It looks like this.
Note that since the flow generator 50 and the nasal cannula 100 described above are well-known technologies, their explanation will be simplified below.

The flow generator 50 includes a control section (control circuit board) that controls the operation of the entire device, an operation section that receives operations from the user, and a blower section that generates "a gas (medical gas) that is a mixture of oxygen and air." , a heating and humidifying section that heats and humidifies the gas generated by the blower section, an air supply port 51 through which the heated and humidified gas (pressurized gas) is sent, and each section (control section, operation section, blower section). , a heating and humidifying section).

Further, a gas supply pipe 55 is connected to the air supply port 51 and serves as a flow path for gas generated and supplied by the flow generator 50, and a tube 101 of a nasal cannula 100 is connected to the distal end of this gas supply pipe 55. It has become so.
Note that the flow generator 50 may be, for example, "High Flow Therapy VUN-001" sold by Kafuventec Co., Ltd., the applicant of the present application.

The nasal cannula 100 includes a tube 101 connected to a gas supply pipe 55 connected to the flow generator 50 and a nasal tube (not shown) connected to the tube 101, and includes a nasal tube connected to the user's nose. is now installed. Then, the gas (medical gas containing high concentration oxygen) supplied from the flow generator 50 is supplied to the user via "the gas supply pipe 55, the tube 101, and the nasal cavity tube."

The mask 200 includes a substantially annular sealing cushion portion 210 that is worn in contact with the user's face, and a substantially dome-shaped main body portion 212 extending from the upper end of the sealing cushion portion 210. A headband HB is attached to the outer periphery of the headband HB, and the mask 200 is fixed to the user's face by the headband HB.
Moreover, when the mask 200 is worn by a user, it covers the user's mouth and nose while forming a gap between the mask 200 and the user's mouth and nose.
Note that the sealing cushion portion 210 and the main body portion 212 are made of, for example, synthetic resin.

Further, the main body part 212 of the mask 200 has a hollow cylindrical exhalation port 213 projecting from the center thereof, which is penetrated at both ends. A sealing portion 215 is provided for airtightly inserting the. The tube 101 of the nasal cannula 100 is airtightly inserted into the sealing portion 215, and the nasal tube of the nasal cannula 100 is placed in the gap between the user's mouth and nose, and the nasal tube is inserted into the user's nose. It will be installed.
Note that the tube 101 of the nasal cannula 100 is inserted through one of the left and right sealing parts 215 depending on the position where the flow generator 50 can be installed.

Further, a pressure adjustment unit W is connected and attached to the exhalation port 213 of the mask 200 to adjust the pressure in the gap formed between the inner peripheral surface of the mask 200 and the user's mouth and nose. This pressure adjustment unit W maintains the pressure in the gap formed between the inner surface of the mask 200 and the user's mouth and nose at a predetermined pressure. With this configuration, the high flow system of this embodiment can apply a high value of PEEP to the user to whom gas is supplied.

Specifically, according to the high flow system of this embodiment, as will be described later, it is possible to apply a higher value of PEEP than the high flow system of the prior art. Therefore, the high-flow system of this embodiment can be applied to a wider range of patients than devices used in conventional high-flow therapy (the high-flow gas insufflation device described in Patent Document 1 and the device described in Non-Patent Document 1). We can expect that. For example, it is thought that the high flow system of this embodiment can be applied to patients with COVID-19, congestive heart failure, and the like.

《Pressure adjustment unit W》
Next, the pressure adjustment unit W that constitutes the high flow system of this embodiment will be described with reference to FIGS. 1 and 2 and FIG. 3 described above.
Here, FIG. 3 is a schematic diagram for explaining the configuration of a pressure adjustment unit that adjusts the pressure in the gap formed inside the mask that constitutes the high flow system of this embodiment.

The pressure adjustment unit W is configured to be detachably attached to the exhalation port 213 of the mask 200.
Specifically, the pressure adjustment unit W includes a T-tube adapter 3 attached to the exhalation port 213 of the mask 200, and a pressure adjustment valve 1 connected to the tip 3a2 of the T-tube adapter 3 (see FIG. 3). , has an elbow pipe connector 7 connected to the free end 3b1 of the branch pipe part 3b of the T-tube adapter 3, and a safety valve 5 connected to the tip of the elbow pipe connector 7 to ensure the user's breathing. are doing.

The pressure adjustment valve 1 is connected to a T-tube adapter 3 connected to the exhalation port 213 of the mask 200, and is formed between the inner surface of the mask 200 and the user's mouth and nose via the T-tube adapter 3. It is designed to communicate with the void section. Moreover, the pressure adjustment valve 1 has a function of adjusting the pressure in the gap formed between the inner surface of the mask 200 and the user's mouth and nose to a predetermined value.
For example, a variable PEEP valve can be used as the pressure regulating valve 1.

The T-tube adapter 3 includes a hollow tubular main pipe portion 3a and a hollow tubular branch pipe portion 3b that branches substantially perpendicularly to the main pipe portion 3a (see FIG. 3).
The rear end portion 3a1 of the main pipe portion 3a is inserted into the cylinder of the exhalation port 213 of the mask 200 and connected to the exhalation port 213. Further, the rear end portion of the pressure regulating valve 1 is inserted into the cylinder of the tip portion 3a2 of the main pipe portion 3a, and is connected to the pressure regulating valve 1.
Further, the T-tube adapter 3 is configured such that the free end 3b1 of the branch pipe portion 3b is inserted into a cylinder at one end of the elbow pipe connector 7, and is connected to the elbow pipe connector 7.

Further, the safety valve 5 is configured as a one-way valve that allows air to flow in one direction, and is connected to the T-tube adapter 3. That is, the safety valve 5 communicates with a gap formed between the inner surface of the mask 200 and the user's mouth and nose via the T-tube adapter 3.
The safety valve 5 is installed in the mask to prevent the inside of the mask 200 from becoming negative pressure and making it difficult to inhale when the user's inhalation flow rate exceeds the flow rate of the gas (medical gas) supplied from the high flow system. Air is made to flow in one direction toward the cavity inside the housing 200.

《Example/Comparative example》
Next, PEEP was actually measured when gas was supplied to a model that reproduced the airway and spontaneous breathing using the high flow system of this embodiment (Example), and as a comparative example for the Example, PEEP was measured using the high flow system of this embodiment. A performance test was conducted to measure PEEP when gas was supplied to a model that reproduced the airway and spontaneous breathing using a high-flow system (prior art system) in which the "Mask 200 and pressure adjustment unit W" were removed from the high-flow system. .
In addition, in this performance test, ``measurements on a normal lung airway/breathing model'', ``measurements on a restrictive lung airway/breathing model'', and ``measurements on an obstructive lung airway/breathing model'' were performed.

As the flow generator 50, "High Flow Therapy VUN-001" sold by Kafuventec Co., Ltd., the applicant of the present application, was used.
Further, as the mask 200, an "anti-infection mask" sold by Kafuventec Co., Ltd., the applicant of the present application, was used.

《Measurement for normal lung airway/breathing model》
The high flow system of this embodiment is attached to an airway/breathing model of normal lungs, the adjusted pressure value (PEEP value) of the pressure adjustment valve 1 is set to "5 _cmH2O ", and the flow rate is set to 20 ( Gas at a flow rate of 40 (L/min), gas at a flow rate of 60 (L/min), and gas at a flow rate of 60 (L/min) were sequentially supplied, and PEEP was measured for each supplied gas flow rate. (Example 1).
In addition, the high flow system of this embodiment was attached to an airway/breathing model of normal lungs, the adjusted pressure value (PEEP value) of the pressure adjustment valve 1 was set to "10 _cmH2O ", and the flow rate was adjusted to the model. Gas at a flow rate of 20 (L/min), gas at a flow rate of 40 (L/min), and gas at a flow rate of 60 (L/min) are supplied in order, and PEEP is adjusted for each flow rate of the supplied gas. Measured (Example 2).
In addition, the high flow system (prior art system) obtained by removing the "mask 200 and pressure adjustment unit W" from the high flow system of this embodiment is attached to a normal lung airway/breathing model, and the flow rate is 20%. (L/min) gas, gas with a flow rate of 40 (L/min), and gas with a flow rate of 60 (L/min) are supplied in order, and PEEP is measured for each supplied gas flow rate. (Comparative Example 1).
Table 1 below shows the measured values of Comparative Example 1, Example 1, and Example 2.

単位（ｃｍH_２О） <Table 1>

Unit ( _cmH2O )

The PEEP value when gas is supplied to the normal lung airway/breathing model is as shown in Table 1 above. PEEP when supplied is " _0cmH2O ", PEEP when supplied with 40 (L/min) is " _1.36cmH2O (rounded)", gas is supplied at 60 (L/min). The PEEP at that time was " _3.57cmH2O (rounded off)".
In addition, in the high flow system of Example 1 in which the pressure adjustment valve 1 was set to "5 _cmH2O ", the PEEP when gas was supplied at 20 (L/min) was " _3.34cmH2O (rounded)", 40 PEEP when gas is supplied at (L/min) is " _5.69cmH2O (rounded off)", and PEEP when gas is supplied at 60 (L/min) is " _9.09cmH2O (rounded off)". )"Met.
In addition, in the high flow system of Example 2 in which the pressure adjustment valve 1 was set to "10 cmH ₂ O", the PEEP when gas was supplied at 20 (L/min) was "3.06 cmH ₂ O (rounded)", 40 PEEP when gas is supplied at (L/min) is " _9.52cmH2O (rounded off)", and PEEP when gas is supplied at 60 (L/min) is " _12.83cmH2O (rounded off)". )"Met.

As described above, according to the high flow system of this embodiment, when supplying gas to the airway/breathing model of normal lungs, under any conditions (adjusted pressure value of pressure adjustment valve 1, gas flow rate to be supplied), It can be seen that higher PEEP can be applied to the model compared to prior art high flow systems.

《Measurement for restrictive lung airway/breathing model》
The high flow system of this embodiment is attached to a restrictive lung airway/breathing model, the adjustment pressure value (PEEP value) of the pressure adjustment valve 1 is set to " _5cmH2O ", and the flow rate is 20cmH2O for the model. (L/min) gas, gas with a flow rate of 40 (L/min), and gas with a flow rate of 60 (L/min) are supplied in order, and PEEP is adjusted for each supplied gas flow rate. Measured (Example 3).
In addition, the high flow system of this embodiment was attached to a restrictive lung airway/respiration model, the adjusted pressure value (PEEP value) of the pressure adjustment valve 1 was set to "10 _cmH2O ", and the flow rate was adjusted to the model. A gas with a flow rate of 20 (L/min), a gas with a flow rate of 40 (L/min), and a gas with a flow rate of 60 (L/min) are supplied in order, and for each flow rate of the supplied gas, PEEP was measured (Example 4).
In addition, the high flow system (prior art system) obtained by removing the "mask 200 and pressure adjustment unit W" from the high flow system of this embodiment is attached to a restrictive lung airway/breathing model, and the flow rate is adjusted to the model. Gas at a flow rate of 20 (L/min), gas at a flow rate of 40 (L/min), and gas at a flow rate of 60 (L/min) are supplied in order, and PEEP was measured (Comparative Example 2).
Table 2 below shows the measured values of Comparative Example 2, Example 3, and Example 4.

単位（ｃｍH_２О） <Table 2>

Unit ( _cmH2O )

As shown in Table 2 above, the PEEP value when gas is supplied to the restrictive lung airway/respiration model is 20 (L/min) of gas in the conventional high flow system of Comparative Example 2. The PEEP when supplying gas is " _0.51cmH2O (rounded)", and the PEEP when supplying 40 (L/min) is " _1.95cmH2O (rounding)", 60 (L/min). The PEEP when the gas was supplied was "4.25 _cmH2O (rounded off)".
In addition, in the high flow system of Example 3 in which the pressure adjustment valve 1 was set to "5 _cmH2O ", the PEEP when 20 (L/min) of gas was supplied was " _4.33cmH2O (rounded)", 40 PEEP when gas is supplied at (L/min) is " _6.97cmH2O (rounded off)", and PEEP when gas is supplied at 60 (L/min) is " _10.11cmH2O (rounded off)". )"Met.
In addition, in the high flow system of Example 4 in which the pressure adjustment valve 1 was set to "10 _cmH2O ", the PEEP when supplying 20 (L/min) of gas was " _5.27cmH2O (rounded)", 40 PEEP when gas is supplied at (L/min) is " _10.79cmH2O (rounded off)", and PEEP when gas is supplied at 60 (L/min) is " _13.94cmH2O (rounded off)". )"Met.

As described above, according to the high flow system of this embodiment, when supplying gas to the airway/breathing model of a restricted lung, it is possible to , it can be seen that a higher PEEP can be applied to the model compared to prior art high flow systems.

《Measurement for obstructive lung airway/breathing model》
The high flow system of this embodiment is attached to an airway/breathing model of obstructive lungs, the adjusted pressure value (PEEP value) of the pressure adjustment valve 1 is set to "5 _cmH2O ", and the flow rate is set to 20 cmH2O for the model. (L/min) gas, gas with a flow rate of 40 (L/min), and gas with a flow rate of 60 (L/min) are supplied in order, and PEEP is adjusted for each supplied gas flow rate. Measured (Example 5).
In addition, the high flow system of this embodiment was attached to an airway/respiration model of obstructive lungs, the adjusted pressure value (PEEP value) of the pressure adjustment valve 1 was set to "10 _cmH2O ", and the flow rate was adjusted to A gas with a flow rate of 20 (L/min), a gas with a flow rate of 40 (L/min), and a gas with a flow rate of 60 (L/min) are supplied in order, and for each flow rate of the supplied gas, PEEP was measured (Example 6).
In addition, the high flow system (prior art system) obtained by removing the "mask 200 and pressure adjustment unit W" from the high flow system of this embodiment is attached to an airway/respiration model of obstructive lungs, and the flow rate is adjusted to the model. Gas at a flow rate of 20 (L/min), gas at a flow rate of 40 (L/min), and gas at a flow rate of 60 (L/min) are supplied in order, and PEEP was measured (Comparative Example 3).
Table 2 below shows the measured values of Example 5, Example 6, and Comparative Example 3.

単位（ｃｍH_２О） <Table 3>

Unit ( _cmH2O )

As shown in Table 3 above, the PEEP value when gas is supplied to the airway/breathing model of obstructed lungs is 20 (L/min) for the conventional high flow system of Comparative Example 3. The PEEP when supplying gas is " _0.59cmH2O (rounded)", and the PEEP when supplying 40 (L/min) is " _1.87cmH2O (rounded)", 60 (L/min). The PEEP when the gas was supplied was "4.25 _cmH2O (rounded off)".
In addition, in the high flow system of Example 5 in which the pressure adjustment valve 1 was set to "5 _cmH2O ", the PEEP when gas was supplied at 20 (L/min) was " _4.67cmH2O (rounded)", 40 PEEP when gas is supplied at (L/min) is " _7.05cmH2O (rounded off)", and PEEP when gas is supplied at 60 (L/min) is " _10.45cmH2O (rounded off)". )"Met.
In addition, in the high flow system of Example 6 in which the pressure adjustment valve 1 was set to "10 _cmH2O ", the PEEP when 20 (L/min) of gas was supplied was " _5.61cmH2O (rounded)", 40 PEEP when gas is supplied at (L/min) is " _10.62cmH2O (rounded off)", and PEEP when gas is supplied at 60 (L/min) is " _13.85cmH2O (rounded off)". )"Met.

As described above, according to the high flow system of this embodiment, compared to the high flow system of the prior art, when supplying gas to the airway/breathing model of obstructive lungs, it is possible to It can be seen that a high PEEP can be applied to the model also in terms of the value (gas flow rate, supplied gas flow rate).

As shown in the above-mentioned Examples (Examples 1 to 6) and Comparative Examples (Comparative Examples 1 to 3), it was confirmed that according to this embodiment, a higher PEEP can be applied compared to the conventional technology. It was done.
Specifically, in the conventional high-flow system, PEEP was less than "0.6 _cmH2O " when gas was supplied at a flow rate of 20 (L/min), but in the high-flow system of this embodiment, The PEEP when supplying gas at a flow rate of 20 (L/min) was "3 to 5.6 cmH ₂ O".
Furthermore, in the conventional high-flow system, the PEEP was less than ₂ cmH2O when gas was supplied at a flow rate of 40 (L/min), but in the high-flow system of this embodiment, the PEEP was less than 2 cmH2O when the gas was supplied at a flow rate of 40 (L/min). PEEP was 5.6 to 10.6 cmH ₂ О when gas was supplied at 5.6 to 10.6 cmH 2 O.
Furthermore, in the conventional high-flow system, the PEEP was less than _4.3 cmH2O when gas was supplied at a flow rate of 60 (L/min), but in the high-flow system of this embodiment, the PEEP was less than 4.3 cmH2O when the gas was supplied at a flow rate of 60 L/min. The PEEP when supplying gas at (L/min) was "9 to 13.9 _cmH2O ".

Therefore, according to the high-flow system of this embodiment, compared to devices used for high-flow therapy in the prior art (the high-flow gas insufflation device described in Patent Document 1 and the device described in Non-Patent Document 1), it is possible to can be expected to expand.
Moreover, since the high-flow system of this embodiment can be used for patients with severe lung conditions, it can be expected to reduce the need to use a ventilator, which is a burden on both patients and medical personnel.

Furthermore, in this embodiment, since the user's (patient's) mouth and nose are covered with the mask 200, direct or indirect droplet infection and aerosol infection such as COVID-19 can be avoided while gas is being supplied to the user. It also has the effect of effectively reducing infection and ensuring the safety of medical workers.

As explained above, according to the present embodiment, clinically significant PEEP can be applied while reducing the ventilation volume due to the flushing effect of dead space, and the high flow system can be applied to patients with many pulmonary function conditions. can be provided.

Note that the present invention is not limited to the embodiments described above, and various changes can be made within the scope of the invention.
For example, in the embodiment described above, the pressure adjustment unit W attached to the exhalation port 213 of the mask 200 was provided with the pressure adjustment valve 1 and the safety valve 3 for preventing the user from being unable to breathe. It is not limited to this. For example, the pressure adjustment unit W may be configured to include only the pressure adjustment valve 1, and the safety valve 3 may be attached to another location on the mask 200.

W…Pressure adjustment unit 1…Pressure adjustment valve 3…T-tube adapter 5…Safety valve 7…Elbow pipe connector

50...Flow generator with built-in heating and humidification function 51...Air supply port 55...Gas supply pipe

200...Mask 210...Sealing cushion part 212...Body part 213...Exhalation port 215...Sealing part HB...Headband

100... Nasal cannula 101... Tube

Claims (2)

A high flow system used for high flow therapy,
a flow generator that generates and supplies a gas mixture of oxygen and air;
a gas supply pipe connected to the gas inlet of the flow generator;
a nasal cannula having one end connected to the gas supply tube and the other end attached to the user's nose;
a mask that covers the user's mouth and nose with a gap formed between the user's mouth and nose;
The mask is provided with an exhalation port, and the tube of the nasal cannula is airtightly inserted into the gap between the user's mouth and nose. is placed,
A high flow system characterized in that a pressure adjustment unit for adjusting the pressure in the cavity is attached to the exhalation port, and the pressure in the cavity is maintained at a predetermined pressure. The pressure adjustment unit is
a T-tube adapter attached to the exhalation port of the mask;
a pressure regulating valve connected to the tip of the T-tube adapter;
an elbow pipe connector connected to the branch pipe part of the T-shaped pipe adapter;
a safety valve connected to the tip of the elbow pipe connector to ensure the user's breathing;
The high flow system according to claim 1, wherein the pressure regulating valve maintains the pressure in the cavity at a predetermined pressure.

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