JP7206473B2 - Respiratory tuner - Google Patents

Description

The present disclosure relates to respiratory tuners. More particularly, it relates to a respiratory synchronizer that synchronizes with the user's breathing and supplies oxygen to the user.

2. Description of the Related Art Conventionally, there is a respiratory synchronizer that supplies oxygen to, for example, a patient (hereinafter referred to as a “user”) who has a lung disease and whose lung function is reduced. This respiratory synchronizer is connected to an oxygen cylinder and a cannula worn by a user, and supplies oxygen from the oxygen cylinder to the user via the cannula in synchronization with the user's breathing.

Respiratory synchronizers usually have a pressure sensor that detects the user's inhalation, detects the change in pressure from the atmospheric pressure when the user starts inhaling, and provides oxygen to the user based on this detection signal. (See Patent Document 1, for example).

In a conventional respiratory synchronizer, the user's breathing is not detected by the sensor for a long period of time (e.g., 30 seconds) due to, for example, the cannula being dislodged from the user's nose in order to more reliably oxygenate the user. In this case, an alarm is given as an abnormality in the intake of air, and as a result, oxygen is not supplied in synchronism with respiration (synchronization error). This alarm informs the user that oxygen is not being properly supplied.

However, in addition to the case where oxygen cannot be supplied continuously for a long period of time as described above, there are cases where oxygen cannot be supplied intermittently, as exemplified in (1) to (3) below.

(1) Improper cannula attachment If the cannula that supplies oxygen to the user is not attached correctly to the user's nose, etc., the user's breathing cannot be detected accurately. , breathing may or may not be detected. In this case, oxygen cannot be supplied to all of the user's breaths, resulting in intermittent oxygen supply.

(2) Breathing Interval Disturbance The respiration synchronizer assumes the next inhalation time (time for inhaling air) based on the user's respiration interval, that is, the time from the start of the previous breath to the start of the current breath. Although the delivery time is calculated, if the breath interval is irregular, the next (assumed) inhalation time will be longer when the breath interval is long, and the next (assumed) breath time when the breath interval is short. In some cases, the (assumed) inhalation time becomes short and irregular, resulting in insufficient oxygen supply. In addition, the respiratory synchronizer predicts the next breathing start time based on the breathing interval up to that point, and the sensor for detecting inhalation other than around the predicted timing is used from the viewpoint of power saving and malfunction prevention. Some are designed to be turned off, and in this case, if the breathing interval is unstable, it is difficult to supply oxygen in synchronism with the user's breathing. If inspiration is initiated when the sensor is off, oxygen delivery cannot be synchronized with the user's breathing.

(3) Mouth breathing When breathing is difficult during exercise, etc., the user unconsciously breathes through the mouth. For this reason, it is difficult to detect the user's breathing with a cannula inserted into the nose, and as a result, oxygen cannot be supplied to the user in synchronization with the user's actual breathing. As a respiratory synchronization device, it can only grasp the breath that can be detected by the sensor, so when the user breathes through the mouth, it is determined that irregularly long breathing intervals appear within short breathing intervals. Resulting in.

JP-A-2006-6521

In order to be able to detect the user's breathing as accurately as possible with conventional respiratory syncronizers, for example, the respiration detection program should be improved to be more tolerant to noise, and the user should be better educated on how to use it. has been mainly performed, but it is desired to make it possible to supply oxygen more reliably.

SUMMARY OF THE DISCLOSURE The present disclosure aims to provide a respiratory synchronizer that can provide adequate oxygenation to a user.

The respiratory tuner of the present disclosure comprises:
(1) A respiratory synchronizer that supplies oxygen to a user according to the user's breathing,
an intake sensor that detects the user's intake;
a calculation unit that calculates a breathing interval of the user based on detection by the inhalation sensor;
a determination unit that determines the respiratory state of the user based on the change in the breathing interval of the user calculated by the calculation unit;
When the change in the breathing interval of the user exceeds a predetermined threshold a plurality of times, the determination unit determines that oxygen supply matching the user's breathing is not being performed.

In the respiratory synchronization device of the present disclosure, focusing on the user's breathing interval, the calculation unit calculates the user's breathing interval based on the detection of the inhalation sensor that detects the user's inhalation, and based on the calculated user's breathing interval The user's breathing condition is determined by the determination unit. Then, when the change in the breathing interval of the user exceeds a predetermined threshold a plurality of times, it is determined that the oxygen supply matching the breathing of the user is not performed.

As described above, changes or fluctuations in the breathing interval can occur due to improper cannula attachment or the user's mouth breathing. The oxygen is not being delivered properly in line with , and the user can determine that they are not in a properly oxygenated breathing state. In this case, for example, an error message is displayed on the display of the respiratory synchronizer to warn the user, or oxygen is continuously supplied to the user from a synchronization mode that supplies oxygen in synchronization with the user's breathing. By switching to a continuous flow mode that supplies oxygen continuously, it is possible to supply the user with sufficient oxygen.

As used herein, the term "tuning mode" refers to a normal operation mode of a respiratory synch device in which oxygen is supplied to a user for a predetermined period of time in response to detection of user inspiration. "Continuous flow mode" means a mode of operation that continuously provides oxygen to a user regardless of the user's inspiration.

(2) It is preferable that the respiration synchronizer of (1) above includes an alarm unit that issues an alarm to the user when the judgment unit judges that oxygen is not being supplied in accordance with the user's breathing. . In this case, the user can take countermeasures such as checking the mounting state of the cannula based on the issued warning. As a result, oxygen can be supplied in synchronization with the user's breathing, and sufficient oxygen can be supplied to the user.

(3) In the respiratory synchronizer of (1) or (2) above, when the determination unit determines that oxygen supply matching the user's breathing is not being performed, the determination unit synchronizes with the user's breathing. It is possible to switch from a synchronous mode that delivers oxygen continuously to a continuous flow mode that delivers oxygen continuously to the user. In this case, by continuously supplying oxygen, it is possible to supply sufficient oxygen to the user.

(4) In the respiratory synchronization apparatus of (3) above, it is desirable to switch to the synchronization mode after the continuous flow mode is employed for a predetermined period of time. In this case, when the change in the user's breathing interval is caused by exercise, etc., it is considered that the user's breathing will be stabilized by continuously supplying oxygen to the user for a predetermined time in the continuous flow mode. By switching to tuning mode after the predetermined time has elapsed, oxygen consumption can be conserved.

(5) In the respiratory tuner of (3) or (4), switching from the tuning mode to the continuous flow mode can be performed by opening and closing a solenoid valve. In this case, the synchronous mode can be easily switched to the continuous flow mode by operating the solenoid valve.

(6) In the respiratory synchronizer of (3) or (4), switching from the synchronized mode to the continuous flow mode can be performed by switching the oxygen flow path. In this case, the synchronous mode can be easily switched to the continuous flow mode by switching the oxygen flow path.

1 is an explanatory diagram of a configuration of an embodiment of a respiratory synchronizer of the present disclosure; FIG. 2 is a block diagram of a control unit shown in FIG. 1; FIG. FIG. 4 is a diagram showing the relationship between user breathing and respiratory synchronizer oxygen delivery. FIG. 2 is a schematic diagram showing an example of oxygen supply by a respiratory synchronizer; FIG. 5 is a diagram illustrating changes in breathing intervals in the example shown in FIG. 4; FIG. 4 is a schematic diagram showing another example of oxygen supply by a respiratory synchronizer; FIG. 7 is a diagram illustrating changes in breathing intervals in the example shown in FIG. 6; Fig. 10 is a flow chart of an example operation of a respiratory synchronizer; FIG. 4 is a diagram for explaining two types of thresholds used in controlling a respiratory synchronization device; FIG. FIG. 4 is an explanatory diagram of the configuration of another embodiment of the respiratory synchronization device of the present disclosure; FIG. 10 is an explanatory diagram of the configuration of still another embodiment of the respiratory synchronization device of the present disclosure;

Hereinafter, the respiratory tuner of the present disclosure will be described in detail with reference to the accompanying drawings. The present disclosure is not limited to these examples, but is indicated by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

FIG. 1 is a diagram illustrating the configuration of a respiratory synchronizer 1 according to an embodiment of the present disclosure. A respiratory synchronizer 1 is a device that supplies oxygen from an oxygen cylinder 2 to a user via a cannula 8, and has an oxygen inlet 3 and an oxygen outlet 4. As shown in FIG. A bamboo shoot-shaped connector 5 is attached to the oxygen intake 3 , and the other end of a tube 7 connected to a pressure reducing valve 6 provided at the outlet of the oxygen cylinder 2 is connected to the connector 5 . there is On the other hand, one end of a cannula 8 worn by a user is connected to a bamboo shoot-shaped connector 9 attached to the oxygen outlet 4 .

The respiratory synchronizer 1 includes a flow regulator 10 for adjusting the set flow rate of oxygen, a mechanical valve 11, a control unit 12 for controlling the operation of the respiratory synchronizer 1, a dry battery 13 as a power supply, an electromagnetic valve 14, and an intake air of the user. , a relief valve 16, an LED 17 for displaying operating information on a display (not shown), and a buzzer 18 for issuing a warning to the user.

High-pressure oxygen stored in the oxygen cylinder 2 is decompressed by the decompression valve 6 and flows through the tube 7 and the connector 5 into the flow regulator 10 . The flow rate regulator 10 is an element for adjusting the flow rate (L/min) of supplied oxygen, and the user of the respiratory tuner 1 sets it to a predetermined flow rate according to a doctor's prescription. The flow rate regulator 10 functions as a proportional valve that changes the oxygen flow rate. A flow rate setting can be used by matching an orifice sized to the oxygen flow path.

The mechanical valve 11 is a valve that is manually opened by the user to ensure the supply of oxygen when the electromagnetic valve 14 cannot be operated due to the dead battery. Therefore, during normal operation, the mechanical valve 11 is closed.

The solenoid valve 14 switches between a state of supplying the user with oxygen set at a predetermined flow rate by the flow rate regulator 10 and a state of communicating the pressure sensor 15 with the cannula attached to the nose of the user. FIG. 1 shows the solenoid valve 14 with the oxygen supply line shut off and the cannula and the pressure sensor 15 in communication. The pressure sensor 15 detects the pressure that changes from the atmospheric pressure when the user starts to inhale, and transmits this detection signal to the control section 12 .

As shown in FIG. 2, the control unit 12 receives the detection signal from the pressure sensor 15 and switches the state of the solenoid valve 14 to the state of supplying oxygen to the user, or conversely, to the state of supplying oxygen to the user. It has a drive control section 21 for issuing an operation signal or the like for switching to a state in which the cannula and the pressure sensor 15 are in communication with each other, a calculation section 22 and a determination section 23 . The calculator 22 calculates the breathing interval of the user, that is, the interval (time) from the previous start of inspiration to the current start of inspiration, based on the detection signal of the pressure sensor 15 . Further, the determination unit 23 determines the breathing state of the user based on the change in the breathing interval of the user calculated by the calculation unit 22 . Changes in the user's breathing interval and the user's breathing state will be described later.

The relief valve 16 is provided to prevent the oxygen pressure in the respiratory synchronizer 1 from rising above a predetermined value because the cannula 8 that supplies oxygen to the user is not supplied with oxygen, for example, if the cannula 8 is bent. , the oxygen is released to the atmosphere from the relief valve 16 when the set pressure is exceeded.

The respiratory synchronizer 1 supplies oxygen from the oxygen cylinder 2 to the user in synchronization with the user's breathing detected by the pressure sensor 15 . More specifically, the pressure sensor 15 detects the pressure (negative pressure) when the user starts to inhale via a cannula attached to the user's nose, and transmits the detected signal to the control unit 12 . When the controller 12 determines from the received signal that the pressure (negative pressure) exceeds a predetermined threshold value, it controls the solenoid valve 14 to establish a state in which the pressure sensor 15 and the cannula are in communication (see FIG. 1). ) to a state in which oxygen is supplied from the oxygen cylinder 2 to the user.
Further, the respiratory synchronization device 1 according to the present embodiment predicts the next breathing start time based on the previous breathing interval (for example, the previous breathing interval or the average value of the last predetermined number of breathing intervals). , except around the predicted timing, the pressure sensor 15 for detecting intake air is turned off from the viewpoint of power saving and malfunction prevention.

FIG. 3 is a diagram showing the relationship between the user's breathing and the oxygen supply of the respiratory synchronizer. In FIG. 3 and FIGS. 4 and 6 described later, the shaded portion indicates the oxygen supply period, and the vertical axis of the graph indicates the above-described set flow rate of the respiratory synchronizer 1 . Human breathing is normally performed about 20 times per minute. Also, the ratio of inspiratory time to expiratory time is about 1:2. Therefore, assuming that 20 breaths are taken per minute, a person will inhale air for 1 second and then exhale the inhaled air for 2 seconds, repeating this breathing action 20 times per minute. However, since the air inhaled just before the end of inspiration does not reach the lungs, the respiratory synchronizer 1 supplies oxygen only during, for example, 65% of the inspiration time, instead of supplying oxygen during the entire inspiration time. I am trying to supply. Thereby, oxygen can be effectively used. In FIG. 3, the relationship between one oxygen supply time tb and the user's intake time ta is tb=0.65×ta.

Normally, oxygen is supplied to the user in synchronization with the user's breathing at the timings shown in FIG. However, in cases such as the above-described examples (1) to (3), oxygen cannot be supplied to the user, albeit intermittently.
FIG. 4 is a schematic diagram showing an example of oxygen supply by the respiratory synchronizer 1. The user's breathing cannot be detected by the pressure sensor 15, and as a result, oxygen is not supplied in synchronization with the user's breathing. indicates the case. Inadequate attachment of the cannula in example (1) and mouth breathing in example (3) cause detection failure.

In FIG. 4, No. on the horizontal axis. 1 to 7 indicate the number of times the user breathes, and the symbol tn indicates the time from the start of inspiration in the first breath to the start of inspiration in the second breath, that is, the first breathing interval (breathing interval number 1). ing. Similarly, tm indicates the time from the start of inspiration in the third breath to the start of inspiration in the fourth breath, ie, the third breath interval (breath interval number 3).

In the example shown in FIG. 4, the third breath interval tm was considerably longer than the other breath intervals, and it can be assumed that dyssynchrony was present. In FIG. 4, the portion indicated by symbol c would have been supplied to the inspiratory breath that would have existed between the third and fourth breaths detected by the pressure sensor 15. It represents the supply period of wax oxygen. Such synchronism failure occurs when the user's inhalation cannot be detected by the pressure sensor 15 because the cannula is only partially attached to the user's nose. Also, in FIG. 4, the period indicated by symbol d indicates the lengthened oxygen supply period due to the length of the previous breathing interval, that is, the third breathing interval.

FIG. 5 is a diagram illustrating changes in breath intervals in the example shown in FIG. 4, showing that only the third breath interval is noticeably longer. Since the breath interval is usually about 3 seconds, it is considered that one breath could not be detected in the example shown in FIG. In this embodiment, an alarm is issued when such a change or fluctuation in the breathing interval occurs at a certain frequency (eg, 3 times / minute), and at a certain frequency (eg, 5 times / minute) If such breathing interval changes or fluctuations continue, as will be described later, oxygen is supplied continuously instead of in a pulsed manner.

FIG. 6 is a schematic diagram showing another example of oxygen supply by a respiratory synchronizer, showing a case where the user's breathing is disturbed during exercise or the like, and oxygen appropriate for the user's breathing is not supplied. there is Disturbance of breathing intervals in example (2) described above corresponds to this.
In FIG. 6, No. on the horizontal axis. 1-7 indicate the number of breaths of the user, and the symbols tn, to and tp are respectively the first breath interval (breath interval number 1), the third breath interval (breath interval number 3) and the fourth breath interval. (breathing interval number 4).

In the example shown in FIG. 6, "tn" indicates a normal breath interval, "to" is longer than "tn", and "tp" is shorter than "tn". The breathing interval fluctuates even at rest, but when it fluctuates due to taking a deep breath or swallowing saliva during exercise, the magnitude of the fluctuation is greater than that at rest. Therefore, it is possible to determine whether or not the breathing is disturbed by grasping the change in the breathing interval. In FIG. 6, the period indicated by symbol e indicates the lengthened oxygen supply period due to the length of the previous breathing interval, that is, the third breathing interval. Also, the period indicated by symbol f indicates a shortened oxygen supply period because the immediately preceding breathing interval, that is, the fourth breathing interval is short. Therefore, the number of breaths No. At 5, the user is considered oxygen deficient.

FIG. 7 is a diagram for explaining changes in breathing intervals in the example shown in FIG. It can be seen that it is shorter than the breathing interval. In FIG. 7, the vertical axis indicates the magnitude of fluctuation based on the average value (100%) of the breathing interval for a certain period of time. Breathing interval fluctuations may be larger than the normal breathing interval by more than a predetermined value or smaller than the normal breathing interval by more than a predetermined value.
In this embodiment, an alarm is issued when such a change or fluctuation in the breathing interval occurs at a certain frequency (for example, 5 times/minute), and at a certain frequency (for example, 10 times/minute) If such breathing interval changes or fluctuations continue, as will be described later, oxygen is supplied continuously instead of in a pulsed manner.

Next, an operation example of the respiratory synchronization device 1 according to this embodiment will be described based on the flowchart shown in FIG.
First, in step S1, the determination unit 23 of the control unit 12 senses the intake of the user's breath by the pressure sensor 15, and determines whether the control unit 12 has received the detection signal. In step S1, when it is determined that the user's breathing has been detected, the process proceeds to step S2. It is determined whether or not the threshold value B has been exceeded.

Here, the threshold value B and the threshold value A described later will be described with reference to FIG. Threshold B, as shown in FIGS. 6 and 7, is a threshold that is set assuming that breathing intervals become longer or shorter than normal due to breathing disturbance or the like. For this reason, the threshold B has a certain width and has an upper limit and a lower limit. On the other hand, threshold A is a threshold that is set assuming a case where the user's inhalation is not detected due to improper cannula attachment, mouth breathing, or the like, and the breathing interval fluctuates more than in the case of threshold B.

In FIG. 9, the one-dot chain line indicates the user's normal breathing interval (average value), and the dashed line indicates the threshold A or threshold B. In FIG. As the average value, for example, the average value (moving average) of the latest predetermined number of times can be used. Assuming a normal breath interval of 100, threshold B may be, for example, ±30, and threshold A may be, for example, +80. If the breath interval is 60, the lower limit of threshold B has been exceeded, and if the breath interval is 190, the upper limits of threshold A and threshold B have been exceeded.

Returning to FIG. 8, in step S2, if the determination unit 23 determines that the change in the user's breathing interval does not exceed the threshold value B, the process proceeds to step S14, and the respiratory tuner 1 supplies oxygen to the user according to the tuning mode. supply.
On the other hand, if it is determined in step S2 that the change in the user's breathing interval exceeds the threshold value B, the control unit 12 advances the process to step S3. It is determined whether or not the number of times B is exceeded exceeds a predetermined threshold value B-1. The predetermined threshold value B-1 can be, for example, 5 times/minute.

If the threshold value B-1 is not exceeded in step S3, the process proceeds to step S10, and in step S10, the control unit 12 determines whether or not the change in the user's breathing interval exceeds a predetermined threshold value A. . On the other hand, in step S3, when it is determined that the number of times the threshold B is exceeded exceeds the threshold B-1, the process proceeds to step S4, and in the step S4, the control unit 2 determines that the number of times the threshold B is exceeded exceeds a predetermined number. It is determined whether or not the threshold value B-2 is exceeded. The predetermined threshold value B-2 can be, for example, 10 times/minute.

If it is determined in step S4 that the predetermined threshold value B-2 is not exceeded, the process proceeds to step S9, and the controller 12 displays an error in step S9. The error can be displayed by turning on the LED 17 on the display (not shown) of the respiratory syncytizer 1 or by blinking the LED 17 . An error can also be displayed by sounding the buzzer 18 continuously or intermittently. By turning on the LED 17 or the like, it is possible to issue a warning to the user that oxygen is not being supplied in synchronization with the user's breathing. In this embodiment, the LED 17 and the buzzer 18 have the function of informing the user of the operating state of the respiratory syncytizer 1 and also function as an alarm unit that issues an alarm to the user in the event of an abnormality.

In step S4, when it is determined that the predetermined threshold value B-2 is exceeded, the process proceeds to step S5, and in step S5, the control unit 12 changes the method of supplying oxygen to the user from the normal tuning mode to the continuous flow mode. mode. In this continuous flow mode, the user is continuously supplied with oxygen from the oxygen cylinder 2 regardless of the user's breathing. Thus, during this continuous flow mode, the solenoid valve 14 is switched to provide communication between the flow regulator 10 and the user-worn cannula. In other words, communication between the pressure sensor 15 and the user-worn cannula is blocked during the continuous flow mode.

A continuous flow mode of oxygen supply provides sufficient oxygen supply to the user. Since it is considered that the respiratory state of the user is stabilized by continuously supplying oxygen to the user for a certain period of time, in the following step S6, in the present embodiment, the state of the continuous flow mode is maintained for a certain period of time, such as It is determined whether or not one minute has passed. Then, when it is determined in step S6 that the predetermined time has passed, the process proceeds to step S7, in step S8, the control unit 12 stops the supply of oxygen, and in step S8, an error occurs. The display is stopped and the process returns to step S1. Then, when the user's breathing is detected in step S1, and in the subsequent step S2, when the breathing interval obtained based on the user's inspiration detected in step S1 does not exceed the threshold value B, the user is instructed in the normal tuning mode. Oxygen is supplied (step S14).

In step S3, when it is determined that the number of times the threshold B is exceeded does not exceed the predetermined threshold B-1, the process proceeds to step S10. It is determined whether or not the threshold value A of is exceeded. If it is determined in step S10 that the predetermined threshold value A is not exceeded, the process proceeds to step S14, and the respiratory tuning machine 1 supplies oxygen to the user according to the tuning mode.
On the other hand, if it is determined in step S10 that the change in the user's breathing interval exceeds the threshold A, the control unit 12 advances the process to step S11. It is determined whether or not the number of times A is exceeded exceeds a predetermined threshold value A-1. The predetermined threshold value A-1 can be, for example, 3 times/minute.

If it is determined in step S11 that the predetermined threshold value A-1 is not exceeded, the process proceeds to step S14, and the respiratory tuner 1 supplies oxygen to the user according to the tuning mode.
On the other hand, in step S11, when it is determined that the number of times the threshold A is exceeded exceeds the threshold A-1, the process proceeds to step S12, and in the step S12, the control unit 2 determines that the number of times the threshold A is exceeded is a predetermined number. It is determined whether or not the threshold A-2 is exceeded. The predetermined threshold value A-2 can be, for example, 5 times/minute.

In step S12, when it is determined that the predetermined threshold value A-2 is exceeded, the process proceeds to step S5, and in step S5, similarly to the above, the control unit 12 selects the normal oxygen supply method for the user. Switch from synchronous mode to continuous flow mode.

On the other hand, if it is determined in step S12 that the predetermined threshold value A-2 is not exceeded, the process proceeds to step S13, and in step S13, the control unit 12 displays an error in the same manner as described above. The error can be displayed by turning on the LED 17 on the display (not shown) of the respiratory syncytizer 1 or by blinking the LED 17 . An error can also be displayed by sounding the buzzer 18 continuously or intermittently.
After displaying the error, the controller 12 advances the process to step S14, and the respiratory tuner 1 supplies oxygen to the user according to the tuning mode.

[Other Modifications]
The present disclosure is not limited to the embodiments described above, and various modifications are possible within the scope of the claims.
For example, in the above-described embodiment, the state of oxygen supply to the user is switched from the synchronous mode to the continuous flow mode by switching the solenoid valve 14, but the mode can be switched by other methods. For example, as shown in FIG. 10, the mode can be switched by using a valve 31 that can be operated manually by an electromagnet instead of the mechanical valve 11 that is manually operated. In this case, in tuning mode, this valve 31 is closed and oxygen is supplied to the user via the solenoid valve 14 . Then, as shown in the flowchart described above, when it is determined that the user's breathing interval fluctuates and oxygen is not sufficiently supplied to the user, the solenoid valve 14 is closed and the valve 31 is provided with The valve 31 is opened by an electromagnet. Oxygen that has passed through the flow regulator 10 is continuously supplied to the user via the valve 31 . After continuously supplying oxygen to the user for a certain period of time, an electrical signal is sent from the control unit 12 to the valve 31 to close the valve 31, and the solenoid valve 14 is operated to synchronize with the breathing of the user. Return to tuning mode to deliver oxygen. In addition, in the embodiment shown in FIG. 10, the same reference numerals are given to the same elements or configurations as in the embodiment shown in FIG. 1, and the description thereof will be omitted for simplicity.

Further, in the above-described embodiment, the respiration synchronizer is provided with a flow rate regulator for setting the flow rate of oxygen supplied to the user to a predetermined flow rate. It can also be attached to an oxygen cylinder. In addition, in the embodiment shown in FIG. 11, the same reference numerals are given to the same elements or configurations as in the embodiment shown in FIG. 1, and the description thereof will be omitted for simplicity.

1: Respiratory Synchronizer 2: Oxygen Cylinder 3: Oxygen Inlet 4: Oxygen Outlet 5: Connector 6: Pressure Reducing Valve 7: Tube 8: Cannula 9: Connector 10: Flow Controller 11: Mechanical Valve 12: Control Unit 13: dry battery 14: solenoid valve 15: pressure sensor 16: relief valve 17: LED
18: Buzzer 21: Drive control section 22: Calculation section 23: Judgment section

Claims (4)

A respiratory synchronizer (1) that supplies oxygen to a user according to the user's breathing,
an inhalation sensor (15) for detecting the inhalation of the user;
a calculation unit (22) for calculating a breathing interval of the user based on the detection of the inhalation sensor (15);
a judgment unit (23) for judging the respiratory state of the user based on the change in the subsequent breathing interval with respect to the past breathing interval of the user calculated by the calculating unit (22);
The determination unit (23)
If the change in the breathing interval of the user exceeds a predetermined threshold a plurality of times and the number of times the number of times of exceeding exceeds a first threshold, it is determined that oxygen supply matching the breathing of the user is not performed. Together with, the alarm unit (17, 18) issues an alarm to the user,
Further, when the number of times the change in the breathing interval of the user exceeds the predetermined threshold exceeds a second threshold that is larger than the first threshold, the synchronization of supplying oxygen in synchronization with the user's breathing. Respirator (1) switching from mode to continuous flow mode to continuously supply oxygen to the user . Respiratory synchronizer (1) according to claim 1 , wherein after employing said continuous flow mode for a predetermined time, it switches to a tuning mode. 3. Respiratory synchronizer (1) according to claim 1 or 2 , wherein switching from the tuning mode to the continuous flow mode is effected by opening and closing a solenoid valve (14). 3. Respiratory synchronizer (1) according to claim 1 or claim 2 , wherein switching from synchronized mode to continuous flow mode is effected by switching the oxygen flow path.

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