JP2019141195A - High flow rate gas feeding device - Google Patents

Abstract

To provide a high flow rate gas feeding device capable of achieving high flow therapy without a large sized facility.SOLUTION: A high flow rate gas feeding device comprises: a nose cannula attached to the vicinity of a nose of a user; an oxygen supply path for supplying oxygen to the nose cannula; an air supply path for supplying air to the nose cannula; an air blower for feeding air to the air supply path; an oxygen blower for feeding oxygen to the oxygen supply path; a respiration detection part for detecting respiration of a user; and an oxygen control part for controlling the oxygen blower to adjust a flow rate of oxygen in synchronization with respiration.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a high flow rate gas supply device for supplying a high flow rate gas to a user.

  Conventionally, artificial respiration therapy has been performed to artificially assist respiration for patients who have difficulty in spontaneous breathing. Among them, for example, in the case of a comatose patient, when oxygen uptake into the body or carbon dioxide excretion is insufficient, a combination of a tracheal intubation that secures the airway using an endotracheal tube and a ventilator Treatment is given. However, tracheal intubation has a high risk of developing pneumonia and the like, and is a treatment that is difficult to perform safely in developing countries where the level of medical technology is not necessarily high.

  In recent years, as an alternative therapy for tracheal intubation, a technique using high flow therapy in which a gas containing high-concentration oxygen is supplied from the nose using a nasal cannula has become widespread (for example, see Patent Document 1). This high flow therapy is also effective for patients who have developed COPD (Chronic Obstructive Pulmonary Disease).

  FIG. 6 is an explanatory diagram of a high flow rate gas supply device 201 conventionally used for high flow therapy. The high flow rate gas supply device 201 includes a flow generator 209 that determines the flow rate and oxygen concentration of a mixed gas of air and oxygen, and a heater 211 for heating and humidifying the supplied mixed gas to prevent condensation in the breathing circuit 205. And a nose cannula 207 for supplying a mixed gas to the user P through the nostril. The flow generator 209 is connected to a pipe supplied with high-concentration oxygen gas and a pipe supplied with high-pressure compressed air. The user wears a nasal cannula 207 in the nose, and a high flow rate of air and oxygen mixed gas is constantly injected from the nasal cannula 207.

Japanese Patent No. 6005631

  However, when high-flow therapy is performed, a flow rate of 10 L / min is always required as an air and high-concentration oxygen supply gas even in the case of infants, and a flow rate of 60 L / min is required for adults. In order to supply a large amount of high-concentration oxygen, it is essential to connect to a pipe that can always supply oxygen gas or to use a large-capacity oxygen gas cylinder. Such equipment can only be installed in hospitals and it is difficult to perform this treatment at home.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a high flow rate gas supply device capable of performing high flow therapy without extensive equipment.

  In the present invention, air is always provided at a high flow rate, and oxygen is supplied at a high flow rate mainly in synchronization with the breathing of the user during the period of inspiration.

  (1) The present invention provides a nasal cannula mounted near the nose of a user, an oxygen supply path for supplying oxygen to the nasal cannula, an air supply path for supplying air to the nasal cannula, and the air supply An air blower for sending air to the road, an oxygen blower for sending oxygen to the oxygen supply path, a breath detection unit for detecting the breathing of the user, An oxygen control unit that controls the oxygen blower so as to adjust a flow rate, a respiration detection unit that detects respiration of the user, and an oxygen control unit that controls the flow rate of oxygen in synchronization with the respiration. Provided is a high flow rate gas supply device.

  In order to stir the gas in the respiratory organs and efficiently ventilate, the flow rate of the supplied gas must be maintained at a high flow rate. However, in order to constantly supply a high flow rate of oxygen, large-scale facilities such as an oxygen pipe and a large oxygen cylinder are required. According to the invention described in (1) above, the respiration detector detects the user's respiration and includes an oxygen control unit that controls the flow rate of oxygen so as to supply a high flow rate of oxygen when necessary. The present invention has an excellent effect of realizing a high flow rate gas insufflator capable of long-term high flow therapy with a small oxygen capacity.

  (2) The present invention provides the high flow rate gas supply device according to (1) above, further comprising an air control unit that controls the air blower so as to supply the air at a high flow rate. To do.

  According to the invention described in (2) above, since the air control unit that controls the air blower so as to supply the air at a high flow rate is provided, the excellent effect that high flow therapy can be performed at all times is provided. Play.

  (3) In the present invention, the respiration detection unit includes a myoelectric potential measurement unit that measures the myoelectric potential of the user. The high flow rate gas supply according to (1) or (2) above Providing equipment.

  According to the invention described in (3) above, since the movement of the respiratory muscle can be detected by the myoelectric potential measurement unit included in the respiratory detection unit, the user's breathing can be detected, and the supply of oxygen can be controlled in accordance with the breathing. There is an excellent effect that the oxygen to be supplied can be saved.

  (4) The present invention is characterized in that the oxygen control unit controls the oxygen blower so as to have an oxygen supply decrease period in which the flow rate of oxygen is decreased in an expiration time region in which the user exhales. The high flow rate gas supply device according to any one of (1) to (3) above is provided.

  According to the invention described in (4) above, since the flow rate of oxygen can be reduced during the expiration time region in which the user exhales, the total amount of oxygen to be supplied can be reduced, and a large amount of oxygen There is an excellent effect that it is not necessary to.

  (5) In the present invention, the air control unit controls the air blower so as to have an air supply decrease period in which the flow rate of the air is decreased in the expiration time region in which the user exhales. A high flow rate gas supply device according to any one of (1) to (4) above is provided.

  In a state where gas is ejected from the nasal cannula at a high pressure, it is difficult to measure the humidity, carbon dioxide concentration, oxygen concentration, and the like of the air supply gas supplied from the nasal cannula. According to the invention described in (5) above, since the air blower can be controlled so as to have an air supply decrease period in which the flow rate of air is reduced in the expiration time region in which the user exhales, the above measurement is possible. Thus, by feeding back the measurement result and controlling the flow rate of oxygen and the flow rate of air, there is an excellent effect that gas having a more appropriate content can be supplied.

  (6) According to the present invention, the flow rate of the mixed gas in which the air and the oxygen are mixed is 10 to 60 L / min, according to any one of the above (1) to (5), A high flow rate gas supply device is provided.

  When performing high flow therapy, a flow rate of 10 L / min is always required even for infants, and a flow rate of 60 L / min is always required for adults. According to the invention described in (6) above, since a high flow rate gas can be supplied, there is an excellent effect that high flow therapy can be performed from infants to adults.

  (7) The present invention provides the high flow rate gas supply device according to (6) above, wherein the mixed gas has an oxygen concentration of 21 to 100%.

  According to the invention described in (7) above, by continuing to administer a high flow rate of oxygen, exhaled gas with a high concentration of carbon dioxide stored in the nasopharynx can be discharged outside. Moreover, since the alveolar ventilation can be increased by filling the upper airway with a gas having a high oxygen concentration, the respiratory efficiency is improved and oxygenation is improved.

  (8) The present invention is characterized in that the oxygen and the air are ejected from different ejection ports disposed in the vicinity of the nasal cannula and are supplied to the user. 7) A high flow rate gas supply device according to any one of the above.

  According to the invention described in (8) above, since there is an oxygen outlet for supplying oxygen in the vicinity of the nasal cannula to be brought into contact with the nose, it is possible to rapidly increase the concentration of oxygen supplied to the user. Has an effect.

  (9) The high-flow-rate gas supply device according to (8), wherein the oxygen ejection port for ejecting oxygen is located downstream of the air ejection port for ejecting air. I will provide a.

  Since the nasal cannula is a system open to the atmosphere, it is not easy to efficiently deliver a high flow rate gas into the nasal cavity of the user. According to the invention described in (9) above, since the oxygen jet outlet is located downstream of the air jet outlet, when oxygen is jetted out in a jet stream, the pressure around it is reduced and air is taken in. Therefore, it is possible to realize a mixed gas flow of oxygen and air having an excellent effect that gas can be efficiently fed into the nasal cavity.

  (10) In the present invention, the respiration detection unit includes a pulse oximeter that measures the user's arterial oxygen saturation using near infrared light, and the oxygen control unit measures the measured arterial oxygen saturation The high-flow-rate gas supply device according to any one of (1) to (9) above, wherein the flow rate of the oxygen is controlled based on the degree.

  According to the invention described in the above (10), when the arterial blood oxygen saturation of the user tends to decrease, it is possible to perform control such as increasing the oxygen flow rate, thereby improving the user's QOL (Quality Of Life). There is an excellent effect of being able to.

  (11) In the present invention, the respiration detection unit includes an oxygen concentration measurement unit that measures an oxygen concentration in the vicinity of the nasal cannula, and the oxygen control unit controls the flow rate of the oxygen based on the measured oxygen concentration. The high flow rate gas supply device according to any one of (1) to (10) above, characterized in that it is controlled.

  According to the invention described in (11) above, since the respiration detection unit includes the oxygen concentration measurement unit that measures the oxygen concentration in the vicinity of the nasal cannula, the oxygen concentration in the gas supplied to the nose can be monitored. It has an excellent effect that more appropriate ventilation is possible.

  (12) In the present invention, the respiration detection unit includes a carbon dioxide concentration measuring unit that measures a carbon dioxide concentration in the vicinity of the nasal cannula, and the oxygen control unit is configured to measure the oxygen based on the measured carbon dioxide concentration. The high flow rate gas supply device according to any one of the above (1) to (11) is provided.

  According to the invention described in (12) above, the concentration of carbon dioxide contained in exhaled breath can be measured, and the flow rate of oxygen can be controlled based on the concentration of carbon dioxide. If increased, it is possible to control to increase the oxygen flow rate, and there is an excellent effect that more appropriate ventilation is possible.

  (13) Of the above (1) to (12), the present invention includes a heating / humidifying device that heats and humidifies the air and / or oxygen supplied to the user. A high flow rate gas supply device according to any one of the above.

  When supplying gas to the respiratory organ of the user for breathing assistance, there is a possibility that the mucous membrane may be damaged if the supplied gas is dried. According to the invention described in the above (13), there is an excellent effect that it is possible to prevent the above-described obstacles by giving moisture to the gas to be supplied.

  (14) In the present invention, the respiration detection unit includes a humidity measurement unit that measures humidity in the vicinity of the nasal cannula, and the humidity control unit controls the heating humidifier based on the measured humidity. The high flow rate gas supply device described in (13) above is provided.

  According to the invention described in (14) above, the humidity near the nasal cannula can be measured, and the heating humidifier can be controlled based on the measured humidity. There is an excellent effect that air can be supplied.

  (15) The high oxygen according to any one of (1) to (14), wherein the oxygen is supplied from an oxygen concentrator that generates high-concentration oxygen from the air. A flow gas supply device is provided.

  According to the invention described in (15) above, high flow therapy using high-concentration oxygen can be performed without connecting to a pipe that can always supply oxygen gas and without preparing a large-capacity oxygen cylinder. There is an excellent effect that a flow gas supply device can be realized.

  According to the high flow rate gas supply device of the first to fifteenth aspects of the present invention, since it can be controlled to supply a high flow rate of oxygen only when necessary, a high flow therapy for a long time with a small oxygen capacity can be achieved. An excellent effect of realizing a possible high flow rate gas supply device can be achieved.

It is explanatory drawing of the high flow gas insufflation apparatus which concerns on embodiment of this invention. It is a block diagram of a high flow rate gas supply apparatus. (A) It is a perspective view of the nasal cannula which the high-flow-rate gas insufflation apparatus which concerns on embodiment of this invention has. (B) It is explanatory drawing explaining the positional relationship of the oxygen ejection port and air ejection port in a nasal cannula. (A) It is a timing chart explaining the relationship between a user's respiration and oxygen supply. (B) It is a timing chart explaining the relationship between a user's respiration and air supply. (A) It is sectional drawing of the nasal cannula insertion part in a modification. (B) It is a perspective view of the nasal cannula in a modification. It is explanatory drawing of the high flow gas supply apparatus conventionally used for the high flow therapy.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 5 are examples of embodiments for carrying out the invention, and in the drawings, the same reference numerals denote the same components. In addition, a part of the configuration is omitted as appropriate in each drawing to simplify the drawing. The size, shape, thickness, etc. of the members are exaggerated as appropriate.

  FIG. 1 is an explanatory diagram of a high flow rate gas supply device 1 according to an embodiment of the present invention. The high flow rate gas supply device 1 includes a device main body 3 and a breathing circuit 5 connected to the device main body 3 for supplying gas to the user P. The apparatus main body 3 is provided with an air inlet 10 for sucking air. In addition, a nose cannula 7 is provided at the end of the breathing circuit 5, and a high-flowing air-oxygen mixed gas is supplied from the nose cannula 7 to the user P. The breathing circuit 5 includes a heater 9 for preventing condensation in the breathing circuit 5. Reaching the respiratory organs through the nose at high speed while the moisture condensed in the respiratory circuit 5 remains in a liquid state can be a cause for damage to the mucous membrane. By providing the heater 9 for preventing condensation, such a failure can be prevented in advance.

  FIG. 2 is a configuration diagram of the high flow rate gas supply device 1. A solid line represents a gas flow, and a broken line represents a control signal line or the like. The high flow rate gas supply device 1 includes an oxygen concentrator 15 that generates high-concentration oxygen from air, an oxygen blower 20 that supplies oxygen, and a flow rate of oxygen supplied from the oxygen blower 20 to the user P. An oxygen control unit 25 that controls the above is provided. The high flow rate gas supply device 1 includes an air blower 30 that sucks in air and supplies the air, and an air control unit 35 that controls the flow rate of air supplied from the air blower 30 to the user P. Specifically, the oxygen control unit 25 controls the flow rate of oxygen supplied to the user P in accordance with the respiration of the user P detected by the respiration detection unit 45. The air control unit 35 controls the air blower 30 so as to supply air at a high flow rate.

  That is, the high flow rate gas supply device 1 includes a nasal cannula 7 attached near the nose of the user P, an oxygen supply path (not shown) for supplying oxygen to the nasal cannula 7, and supplies air to the nasal cannula 7. An air supply path (not shown), an air blower 30 for supplying air to the air supply path, a respiration detection unit 45 for detecting respiration of the user P, and respiration detected by the respiration detection unit 45 And an oxygen control unit 25 that controls the flow rate of oxygen. The high flow rate gas supply device 1 further includes an air control unit 35 that controls the flow rate of air.

  The flow rate of the mixed gas mixed with air and oxygen supplied from the nasal cannula 7 is 10 to 60 L / min. The oxygen concentration in the mixed gas is 21 to 100%.

  The high flow rate gas supply device 1 includes a warming / humidifying device 40 that warms and humidifies air and / or oxygen supplied to the user P. Specifically, oxygen and air are each heated to, for example, 37 ° C. by the heating / humidifying device 40 and further humidified to a relative humidity of 100%. Oxygen is supplied to the nasal cannula 7 through an oxygen supply path (not shown) provided in the breathing circuit 5. Air is also supplied to the nasal cannula 7 through an air supply path (not shown) provided in the breathing circuit 5. The user P is supplied with a mixed gas of oxygen and air from the nose by wearing the nasal cannula 7.

  The respiration detection unit 45 preferably has a myoelectric potential measurement unit that measures myoelectric potential on the chest of the user P. This is because by measuring the myoelectric potential, it is possible to identify whether the respiration of the user P is in an exhalation state or an inspiration state.

  The respiration detection unit 45 has an oxygen concentration measurement unit (not shown) that measures the oxygen concentration in the vicinity of the nasal cannula 7, and the oxygen control unit 25 adjusts the oxygen flow rate based on the measured oxygen concentration. It is preferable to control the air blower.

  The respiration detection unit 45 has a carbon dioxide concentration measurement unit (not shown) that measures the carbon dioxide concentration in the vicinity of the nasal cannula 7, and the oxygen control unit 25 adjusts the flow rate of oxygen based on the measured carbon dioxide concentration. It is preferable to control the oxygen blower 20 as described above.

  The air controller 35 may control the air blower 30 so as to adjust the air flow rate based on the carbon dioxide concentration.

  The respiration detection unit 45 has a pulse oximeter (not shown) that measures the arterial oxygen saturation of the user P using near infrared light, and the oxygen control unit 25 is based on the measured arterial oxygen saturation. It is preferable to control the oxygen blower 20 so as to adjust the flow rate of oxygen.

  The air control unit 35 may control the air blower 30 so as to adjust the air flow rate based on the arterial blood oxygen saturation.

  The respiration detection unit 45 has a humidity measurement unit (not shown) that measures the humidity in the vicinity of the nasal cannula 7, and the humidity control unit (not shown) can control the heating humidifier based on the measured humidity. preferable.

  The oxygen control unit 25, the air control unit 35, and the humidity control unit (not shown) include a CPU, a RAM, a ROM, and the like, and execute various controls. The CPU is a so-called central processing unit, and executes various programs to realize various functions. The RAM is used as a work area and a storage area of the CPU, and the ROM stores an operating system and programs executed by the CPU.

  The oxygen concentrator 15 is preferably a PSA (Pressure Swing Adsorption) system that separates oxygen and nitrogen in the air.

  FIG. 3A is a perspective view of the nasal cannula 7 included in the high flow rate gas supply device 1 according to the embodiment of the present invention. The oxygen supply path 50 and the air supply path 55 connected from the breathing circuit 5 (see FIG. 2) are extended through the housing 70 to the insertion portion 67 inserted into the nostril.

  Oxygen and air are ejected from different ejection ports arranged in the vicinity of the nasal cannula 7. Specifically, an air outlet 65 and an oxygen outlet 60 are provided at the end of the insertion portion 67 to supply air and oxygen to the nostrils, respectively.

  Since there is an oxygen outlet 60 for supplying oxygen in the vicinity of the nasal cannula 7 to be brought into contact with the nose portion, an excellent effect is obtained that the concentration of oxygen supplied to the user can be rapidly increased.

  FIG. 3B is an explanatory diagram for explaining the positional relationship between the oxygen outlet 60 and the air outlet 65 in the nose cannula 7. The oxygen ejection port 60 that ejects oxygen is located downstream of the air ejection port 65 that ejects air.

  Since the nasal cannula 7 is a system open to the atmosphere, it is not easy to efficiently supply a high flow rate gas into the nasal cavity of the user. With such an arrangement, the oxygen jet port 60 is located downstream of the air jet port 65. Therefore, when oxygen is jetted out in a jet stream, the pressure around it is reduced to take in air and have directivity. A mixed gas flow of oxygen and air can be realized, and an excellent effect that gas can be efficiently fed into the nasal cavity is achieved.

  FIG. 4A is a timing chart illustrating the relationship between the user's breathing and oxygen supply. The horizontal axis represents time, and the vertical axis represents the flow rate for the oxygen flow rate 75 represented by a solid line. The vertical axis indicates the myoelectric potential of the respiratory muscle measured by the myoelectric potential measuring unit included in the respiratory detection unit 45, for example, for the breath 80 represented by a broken line. Specifically, in FIG. Assume that the time of value represents expiration. Specifically, the high flow rate gas supply device 1 according to the embodiment of the present invention includes a nasal cannula 7 (see FIG. 1) that is mounted near the nose of the user P, and oxygen that supplies oxygen to the nasal cannula 7. A supply path 50 (see FIG. 3A), an air supply path 55 (see FIG. 3A) for supplying air to the nose cannula 7, and an air blower 30 for supplying air to the air supply path 55 The oxygen blower 20 for supplying oxygen to the oxygen supply path 50, the respiration detection unit 45 (see FIG. 2) for detecting the respiration timing of the user P, and the respiration timing of the user P An oxygen control unit 25 (see FIG. 2) that controls the oxygen blower so as to adjust the flow rate is provided.

  In the inspiratory time region 90, the oxygen flow rate 75 supplied from the oxygen supply path 50 increases, the oxygen concentration becomes a value of 21% or more, for example, and the oxygen flow rate 75 decreases in the oxygen supply decrease period 93 in the expiratory time region 95. Specifically, in the high-flow-rate gas insufflator 1, the oxygen control unit 25 (see FIG. 2) performs the oxygen flow rate in the oxygen supply decrease period 93 in the expiration time region 95 where the user P exhales. The oxygen blower 20 is controlled so as to reduce the amount.

  In order to stir the gas in the respiratory organs and efficiently ventilate, the flow rate of the supplied gas must be maintained at a high flow rate. However, in order to constantly supply a high flow rate of oxygen, large-scale facilities such as an oxygen pipe and a large oxygen cylinder are required. According to the high flow rate gas supply device 1 according to the embodiment of the present invention, the respiration detection unit 45 detects the respiration of the user P, and the oxygen flow rate is adjusted so as to supply high flow rate oxygen when necessary. Since the oxygen control unit 25 to be controlled is provided, there is an excellent effect that the high flow rate gas supply device 1 capable of performing high flow therapy for a long time with a small oxygen capacity is realized.

  FIG. 4B is a timing chart for explaining the relationship between the breathing of the user P and the air supply. The horizontal axis represents time, and the vertical axis represents the flow rate for the air flow rate 85 represented by a solid line. In addition, the vertical axis represents the respiratory myoelectric potential measured by the myoelectric potential measuring unit included in the respiratory detection unit 45 with respect to the breath 80 represented by a broken line, and the positive value represents exhalation.

  In the entire inspiratory time region 90 and most of the expiratory time region 95, air is supplied at a substantially constant high flow rate, and the air supply decrease in the expiratory time region 95 from which the user exhales is expired. In the period 100, the air control unit 35 controls the air blower 30 so as to decrease the flow rate of the air supplied from the air supply path 55.

  In a state where the gas is ejected from the nasal cannula 7 at a high pressure, it is difficult to measure the humidity, carbon dioxide concentration, oxygen concentration, and the like of the air supply gas supplied from the nasal cannula 7. According to the high flow gas insufflation device 1 according to the embodiment of the present invention, the air flow rate can be reduced during the air supply decrease period 100 in the expiration time region 95 in which the user P exhales. Therefore, the above measurement becomes possible, and the oxygen flow rate and the air flow rate are adjusted by feedback control of the oxygen blower 20, the air blower 30, and the heating humidifier 40 based on the measurement result, There is an excellent effect that the gas of the contents can be supplied.

  According to the high flow gas insufflation apparatus 1 according to the embodiment of the present invention, since the movement of the respiratory muscles can be detected by the myoelectric potential measurement unit of the respiratory detection unit 45, the breathing of the user P can be detected and matched with the breathing. Thus, the oxygen supply can be controlled, and the oxygen to be supplied can be saved.

  According to the high flow rate gas supply device 1 according to the embodiment of the present invention, the oxygen supply decrease period 93 for decreasing the flow rate of oxygen is provided during the expiration time region 95 when the user P exhales. The total amount of oxygen can be reduced, and the excellent effect of eliminating the need for large amounts of oxygen is achieved.

  When performing high flow therapy, a flow rate of 10 L / min is always required even for infants, and a flow rate of 60 L / min is always required for adults. According to the high flow rate gas supply device 1 according to the embodiment of the present invention, since a high flow rate gas can be supplied, there is an excellent effect that high flow therapy can be performed from infants to adults.

  According to the high flow gas insufflation device 1 according to the embodiment of the present invention, by continuously administering high flow oxygen, the exhaled gas having a high concentration of carbon dioxide stored in the nasopharynx can be discharged outside. it can. Moreover, since the alveolar ventilation can be increased by filling the upper airway with a gas having a high oxygen concentration, the respiratory efficiency is improved and oxygenation is improved.

  According to the high flow rate gas supply device 1 according to the embodiment of the present invention, the oxygen jet port 60 for supplying oxygen is provided in the vicinity of the nasal cannula 7 to be brought into contact with the nose portion. It has an excellent effect that it can be increased.

  According to the high flow rate gas supply device 1 according to the embodiment of the present invention, when the arterial blood oxygen saturation level of the user tends to decrease, it is possible to perform control such as increasing the oxygen flow rate. It is possible to improve the quality of life).

  According to the high flow rate gas supply device 1 according to the embodiment of the present invention, the respiration detection unit 45 includes the oxygen concentration measurement unit that measures the oxygen concentration in the vicinity of the nasal cannula 7, so oxygen in the gas supplied to the nose It is possible to monitor the concentration, and there is an excellent effect that more appropriate ventilation is possible.

  According to the high flow gas insufflator 1 according to the embodiment of the present invention, the concentration of carbon dioxide contained in exhaled air can be measured, and the flow rate of oxygen can be controlled based on the carbon dioxide concentration. If the concentration of carbon dioxide is increased, it is possible to control to increase the oxygen flow rate, and an excellent effect is obtained that more appropriate ventilation is possible.

  When supplying gas to the respiratory organ of the user P for breathing assistance, there is a possibility that the mucous membrane may be damaged if the supplied gas is dried. According to the high flow rate gas supply device 1 according to the embodiment of the present invention, there is an excellent effect that moisture is supplied to the supplied gas to prevent the above-described failure.

  According to the high flow rate gas supply device 1 according to the embodiment of the present invention, the humidity in the vicinity of the nasal cannula 7 can be measured, and the warming humidifier 40 can be controlled based on the measured humidity. There is an excellent effect that a gas having an appropriate humidity can be supplied.

  According to the high-flow-rate gas supply device 1 according to the embodiment of the present invention, high-concentration oxygen is used without connecting to a pipe capable of always supplying oxygen gas or preparing a large-capacity oxygen cylinder. There is an excellent effect that it is possible to realize a high flow rate gas supply device capable of performing high flow therapy.

  Note that the high flow rate gas supply device 1 of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, various shapes can be considered for the shape of the insertion portion 67 of the nasal cannula 7. FIG. 5A is a cross-sectional view of a modified embodiment of the insertion portion 67 of the nasal cannula 7. The oxygen outlet 60 and the air outlet 65 are integrally formed.

  FIG. 5B is a perspective view of a nasal cannula 7 according to another modified embodiment. In this modified embodiment, the oxygen supply path 50 and the air supply path 55 merge upstream of the housing 70, and supply a mixed gas of air and oxygen to the housing 70 as the breathing circuit 5. The housing 70 is connected to a gas detection path 110 for analyzing the contents of the gas near the nasal cannula 7. The gas detection path 110 is connected to an oxygen concentration measurement unit, a carbon dioxide concentration measurement unit, a humidity measurement unit, a thermometer, and the like, and based on the measurement results, an oxygen blower 20, an air blower 30, and a heating humidifier. As a result of feedback control of 40 and the like, a more appropriate mixed gas can be supplied. The gas detection path 110 is preferably controlled at a lower pressure than the inside of the housing 70.

DESCRIPTION OF SYMBOLS 1 High flow gas air supply apparatus 3 Apparatus main body 5 Breathing circuit 7 Nasal cannula 9 Heater 10 Inlet 15 Oxygen concentrator 20 Oxygen blower 25 Oxygen control part 30 Air blower 35 Air control part 40 Warming humidifier 45 Respiration detection part DESCRIPTION OF SYMBOLS 50 Oxygen supply path 55 Air supply path 60 Oxygen outlet 65 Air outlet 67 Insertion part 70 Housing 75 Oxygen flow 80 Respiration 85 Air flow 90 Inspiratory time area 93 Oxygen supply decreasing period 95 Exhalation time area 100 Air supply decreasing period 105 Mixed gas Spout 110 Gas detection path 201 High flow gas insufflator 205 Breathing circuit 207 Nasal cannula 209 Flow generator 211 Heater 220 Heating humidifier P User

Claims (15)

A nasal cannula attached near the user's nose,
An oxygen supply path for supplying oxygen to the nasal cannula;
An air supply path for supplying air to the nasal cannula;
An air blower for sending air to the air supply path;
An oxygen blower for supplying oxygen to the oxygen supply path;
A respiration detection unit for detecting respiration of the user;
An oxygen control unit for controlling the oxygen blower so as to adjust the flow rate of the oxygen in synchronization with the respiration;
A high flow rate gas supply device comprising:   The high flow rate gas supply device according to claim 1, further comprising an air control unit that controls the air blower so as to supply the air at a high flow rate.   The high-flow-rate gas supply device according to claim 1, wherein the respiration detection unit includes a myoelectric potential measurement unit that measures myoelectric potential of the user.   The oxygen blower controls the oxygen blower so as to have an oxygen supply decrease period in which the flow rate of the oxygen is reduced in an expiration time region in which the user exhales. The high flow rate gas supply device according to any one of claims 3 to 4.   The air blower controls the air blower so as to have an air supply decrease period in which the flow rate of the air is reduced in the expiration time region in which the user exhales. The high-flow-rate gas supply device according to any one of claims 1 to 4.   The high-flow-rate gas supply device according to any one of claims 1 to 5, wherein a flow rate of the mixed gas in which the air and the oxygen are mixed is 10 to 60 L / min. .   The high flow rate gas supply device according to claim 6, wherein the mixed gas has an oxygen concentration of 21 to 100%.   The said oxygen and the said air are ejected from the different jet nozzle arrange | positioned in the vicinity of the said nasal cannula, and are supplied to the said user, The any one of Claims 1-7 characterized by the above-mentioned. The high flow rate gas supply device described in 1.   The high flow rate gas supply device according to claim 8, wherein the oxygen ejection port for ejecting oxygen is located downstream of the air ejection port for ejecting the air.   The respiration detection unit includes a pulse oximeter that measures the arterial oxygen saturation of the user using near-infrared light, and the oxygen control unit is configured to control the oxygen based on the measured arterial oxygen saturation. The high flow rate gas supply device according to any one of claims 1 to 9, wherein the flow rate is controlled.   The respiration detection unit includes an oxygen concentration measurement unit that measures an oxygen concentration in the vicinity of the nasal cannula, and the oxygen control unit controls the flow rate of the oxygen based on the measured oxygen concentration. The high flow rate gas supply device according to any one of claims 1 to 10.   The respiration detection unit includes a carbon dioxide concentration measurement unit that measures a carbon dioxide concentration in the vicinity of the nasal cannula, and the oxygen control unit controls the flow rate of the oxygen based on the measured carbon dioxide concentration. The high-flow-rate gas supply device according to any one of claims 1 to 11, wherein the high-flow rate gas supply device is characterized.   The high air heating apparatus according to any one of claims 1 to 12, further comprising a heating / humidifying device that heats and humidifies the air and / or oxygen supplied to the user. Flow gas insufflator.   The respiratory detection unit includes a humidity measurement unit that measures humidity in the vicinity of the nasal cannula, and the humidity control unit controls the heating humidifier based on the measured humidity. The high flow rate gas supply device described in 1.   The high-flow-rate gas supply device according to any one of claims 1 to 14, wherein the oxygen is supplied from an oxygen concentrator that generates high-concentration oxygen from the air.

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