JPH04132560A - Medical oxygen concentration apparatus and method - Google Patents

Abstract

PURPOSE:To enable the feeding of a concentrated oxygen gas to a respiratory organ stably by a method wherein an inhaling synchronized solenoid valve is opened synchronously early in an inhaling phase of a breathing cycle to feed the concentrated oxygen gas stored to an inhaler and then, closed synchronously after a specified time or early in the subsequent inhaling. CONSTITUTION:When an exhaling signal from an exhaling/inhaling discrimination circuit 14 is outputted to a cycle generation circuit 13, a program set on the circuit 13 is started to generate oxygen. Then, an inhaling signal discriminated and amplified with the exhaling/inhaling discrimination circuit 14 is inputted into an inhaling synchronized solenoid value 22 to open the inhaling synchronized solenoid valve 22 synchronously early in the inhaling of a patient or the like and oxygen stored in a storage tank 21 is supplied to a respiratory organ through a nose canula. As one-way valve 20 works when the inhaling of the patient or the like begins, oxygen stored in the storage tank 21 will not reverse to an adsorption column 9. At this point, the oxygen stored in the storage tank 21 is secured sufficiently in a quantity necessary for the patient or the like. This enables the supplying of the oxygen stably to the respiratory organ if the timing of starting the release of the inhaling synchronized solenoid valve 22 is after the timing of starting the sampling of oxygen.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure fluctuation adsorption type medical oxygen concentrator for supplying oxygen gas in synchronization with the breathing of a living body.

(Prior Art) Various pressure fluctuation adsorption type medical oxygen concentrators have been proposed in the past. For example, in Japanese Patent Publication No. 57-5571, two adsorption beds are used, one of which is discloses a system in which a portion of the oxygen-enriched gas produced by one adsorption bed during an adsorption cycle is used to purge another adsorption bed, so that the operating cycles of each adsorption bed are performed alternately. has been done. According to this oxygen concentrator,
Even though each adsorption bed has a relatively small volume, it has the advantage that they can be sufficiently purged from each other to produce concentrated oxygen gas at the desired concentration.

In addition, in Japanese Patent Publication No. 57-52090, relatively small adsorbent particles of 40 to 80 mesh are packed into an adsorption bed with a certain relationship between diameter and length to create flow resistance during each stroke operation. After introducing compressed air into the adsorption bed for a short period of time, the inlet is opened to the atmosphere and the pressure is reduced after a predetermined stoppage period has elapsed, thereby obtaining concentrated oxygen gas during the compressed air introduction period and the stoppage period. , discloses a single bed oxygen enrichment method in which a pressure difference causes a reverse flow within the bed during an open atmosphere period to purge the adsorbent. According to this oxygen ficondensation method, one cycle of adsorption bed operation consisting of a compressed air introduction period, a stop period, and an atmosphere opening period can be made extremely short, 3 to 30 seconds (RPSA method), and therefore the overall This method has the advantage that the production amount of generated gas per unit weight of adsorbent can be relatively high, and the entire device can be made smaller and lighter. Furthermore, in Japanese Patent Publication No. 57-44361, a plurality of adsorption beds are used, and one cycle of operation of each adsorption bed is defined as a compressed air introduction period, a stop period, an atmosphere opening period, and a product repressurization period. The timing is staggered between the adsorption beds, and part of the product gas produced during the compressed air introduction period of one adsorption bed is used as purge gas for other adsorption beds that are open to the atmosphere, and the product is re-added. Oxygen enrichment methods have been disclosed for use as product repressurization gas in other adsorption beds during pressure periods.

On the other hand, breathing is a method in which an oxygen concentrator as described above is used and the concentrated oxygen gas generated by the device is supplied through a solenoid valve or the like in synchronization with the breathing of patients with respiratory or circulatory system diseases. Various synchronous oxygen supply devices have been proposed in the past. For example, in Japanese Patent Publication No. 62-54023, concentrated oxygen gas is supplied during each inspiratory phase via a magnetic valve in response to a timing signal for transitioning from an expiratory phase to an inspiratory phase based on an electrical signal generated from the respiratory airflow. An oxygen gas supply device is disclosed.

(Problem to be Solved by the Invention) However, the conventional medical oxygen concentrator described above is configured to operate independently, regardless of the patient's breathing movement, and therefore, for example, it is difficult to direct the generated gas to the patient. It is said that the gas cannot be used to purge the adsorption bed when it is not needed, and that when a large amount of produced gas is used for patients, a sufficient amount of purge gas cannot be sent to the adsorption bed at the same time. There is a problem that there is a problem that efficiency improvement occurs over time. In addition, one possible way to solve this problem is to increase the capacity of the surge tank that stores the concentrated oxygen gas generated in the adsorption bed, but this would make the entire device large and expensive. There's a problem.

The present inventors also made an invention in Japanese Patent Application Laid-Open No. 1-274771 in which a PSA type oxygen concentrator is operated in synchronization with a person's breathing cycle. This uses the RPSA method, which is the technology disclosed in Japanese Patent Publication No. 57-52090, and in order to speed up the operation, the device is made as small as possible and the operation cycle is based on the human body's breathing. Air, which is the raw material for concentrated oxygen, is fed into the adsorption tower in time with the intake of the human body, and the person attempts to inhale the oxygen that comes out from the exit of the adsorption tower, so there is a slight timing delay during this time. Rapid breathing has disadvantages in that it gives the patient a sense of discomfort and tends to result in insufficient inhalation efficiency.

The present invention has been made by focusing on these conventional problems, and provides a medical oxygen concentrator that is appropriately configured so that it can efficiently and consistently produce oxygen-enriched gas and that the entire device can be made compact. The purpose is to provide

(Means for solving the problem of divisions and companies) The present invention comprises one or more adsorption towers filled with an adsorbent that selectively and quickly adsorbs nitrogen in compressed air;
A compressor or compressed air source connected to the inlet of this adsorption tower via a first 1i solenoid valve, and a second it solenoid valve that intermittently opens said inlet to atmospheric pressure or a source of negative pressure; A sensor installed at or near the device to detect the phase of respiration of a person, etc.; an exhalation/inhalation discrimination circuit that discriminates between the exhalation phase and the inhalation phase based on changes in the output of this sensor and sends out necessary signals; and the discrimination circuit. At the start of the exhalation and inhalation phases of the breathing cycle, or at an arbitrary electrical delay from the start of these breathing signals, the first solenoid valve is opened to supply compressed air to the adsorption tower. is introduced and pressurized until it reaches a constant pressure, then an adsorption phase is introduced through which concentrated oxygen gas passes through, and then the first solenoid valve is closed, and after a certain period of stop, the second solenoid valve is closed. a cycle generation circuit that program-controls a desorption purge phase in which a valve is opened to remove a gas containing a large amount of nitrogen or moisture adsorbed to an atmospheric pressure or negative pressure source, and the cycle is operated in an optimal pattern for each cycle;
A buffer tank for storing concentrated oxygen gas generated from the adsorption tower is connected to a storage tank via a one-way valve, and the storage tank and the inhalation device are connected via a conduit via an intake synchronization valve.・The signal from the intake phase discrimination circuit,
The intake tuning solenoid valve is opened in synchronization with the beginning of the inhalation phase of the breathing cycle, the stored concentrated oxygen gas is exhaled at once and sent toward the inhalation device, and after a predetermined period of time, the intake tuning solenoid valve is closed. This medical oxygen concentrator is characterized by:

(Function) In order to achieve the above object, the present invention is disclosed in Japanese Patent Application Laid-Open No.
) - A reservoir for supplying concentrated oxygen gas (hereinafter simply referred to as oxygen or oxygen gas) capable of ensuring the required oxygen concentration for a single intake of a patient, etc. through a one-way valve after the surge tank for generated gas according to the invention of Publication No. 274771 This problem was solved by providing a tank.

In other words, the patient's breathing is captured by a sensor and converted into a signal.
Before the patient's inspiration begins, an oxygen concentrator cycle is started using a signal arbitrarily delayed from the expiratory signal or from the inspiratory signal just before the expiratory signal as a trigger signal, so that the generated oxygen is (before the start)
The required amount of air is stored in a storage tank, and air is delivered into the respiratory organ in synchronization with the beginning of the intake air. In other words, in one cycle of oxygen generation, the amount of oxygen required for one intake is secured in the storage tank with sufficient margin, but prior to this, the oxygen generated is stored in the buffer tank and the amount of oxygen required for one intake is secured in the storage tank. The feature is that it can be used as a purge gas exclusively for regeneration. Therefore, this means that
The generated oxygen gas is stored separately in a storage tank for supplying air to the respiratory organs of patients, etc., and in a buffer tank as purge gas for regenerating the adsorption bed of the oxygen:a-condensation equipment. This device is capable of constantly and stably generating oxygen and supplying it in synchronization with breathing.

(Example) FIG. 1 shows a first embodiment of the invention.

In Fig. 1, 1 indicates the power supply, 2 indicates the operating circuit connected to this, 3 indicates the compressor connected to the operating circuit, and 4A indicates the wiring between them. In the present invention, the compressor 3 is connected to the first
Connect the tvL valve 7.

8 is a mechanism (a solenoid or a servo motor) for operating the first t magnetic valve 7. 1st i! The magnetic valve 7 is connected to the adsorption tower 9 through a pipe 5B. 10 is a silencer, 11 is piping 5
The second valve connected to the silencer IO by C is a magnetic valve, and the second electric valve 11 is connected to the adsorption tower 9 by a pipe 5B. 12 is a mechanism for operating the solenoid valve 11; the first is a mechanism 8 for operating the solenoid valve 7; and the mechanism 1 for operating the second solenoid valve 11.
2 are connected to the cycle generation circuit 13 through wirings 4B and 4C, respectively.

The cycle generation circuit 13 is connected to the aforementioned driving circuit 2 through a wiring 4D, and is also connected to the exhalation/inhalation discrimination circuit 14 through a wiring 4D.
Connect by E. Reference numeral 15 denotes a check valve, and 16 denotes an orifice, which are connected to the adsorption tower 9 through a pipe 5D.

This check valve 15 and orifice 16 are connected in parallel, and are connected to an operating valve 18 via a pipe 5E and a buffer tank 17. Reference numeral 19 denotes a mechanism that opens and closes the operating valve 18 in response to an electric signal from the operating circuit 2.

The operating valve 18 is connected to the one-way valve 20 via a pipe 5F, and is also connected to an intake tuning solenoid valve 22 via a pipe 5G and an oxygen storage tank 21. An opening/closing mechanism 23 that operates the intake tuning solenoid valve 22 is connected to the exhalation/inhalation discrimination circuit 14 via a wiring 4G. The intake tuning solenoid valve 22 is connected to a nasal cannula 24, which is an inhalation device, via a pipe 5H, and the nasal cannula 24 is provided with a temperature sensor 24S for expiration and intake air. This is a respiratory sensor that converts temperature changes in breathing air into electrical signals. An electrical signal from the breathing sensor 24S is taken into the exhalation/inhalation discrimination circuit 14 via the wiring 4F.

The outline of the electric circuit that controls the above-mentioned mechanical configuration is as follows: commercial power #1 etc. is taken in from the outside, the operation circuit 2 is operated in response to a command to start operation of the device 0, and the opening/closing mechanism 19 of the operation valve 18 is operated.
By supplying power to the compressor 3, the cycle generation circuit 13, and the intake/exhalation discrimination circuit 14, the compressor 3 is started and the operating valve 1B is opened.

Next, the respiratory sensor 24S provided on the nasal cannula 24
Detects a breathing signal, takes this breathing signal into an exhalation/inhalation discrimination circuit 14, amplifies it, and discriminates between exhalation and inspiration. A signal arbitrarily delayed from the discriminated exhalation signal or inhalation signal is outputted as a trigger signal to the cycle generation circuit 13, and the inhalation signal is outputted to the intake tuning solenoid valve 22.

The cycle generating circuit 13 is time-programmed in a fixed manner to determine the best oxygen concentrating cycle for the oxygen concentrator. The outline of the program pattern of this cycle generation circuit 13 will be explained based on FIG. Time (S-5)
Next, the pressure of the compressed air in the adsorption tower 9 is maintained to adsorb nitrogen gas, and the generated oxygen is transferred to the buffer tank 17.
and the stop time for collecting and accumulating in the storage tank 21 (S-
8), followed by a second time (S-6) in which the magnetic valve 11 is opened and the gas with a high concentration of nitrogen remaining in the adsorption tower 9 is discharged into the atmosphere.

As a result, the pressure in buffer tank 1 becomes relatively high.
After the oxygen stored in the adsorption column 7 is caused to flow back and the interior of the adsorption tower 9 is purged and regenerated, the second magnetic valve 11 is closed. Therefore, when an exhalation signal is output from the exhalation/inhalation discrimination circuit 14 to the cycle generation circuit 13 during operation, the program set in the cycle generation circuit 13 is started to generate oxygen.

Next, the inhalation signal discriminated and amplified by the exhalation/inhalation discrimination circuit 14 is input to the inhalation tuning solenoid valve 22, and the inhalation tuning is performed by opening the solenoid valve 22 in synchronization with the beginning of inspiration. The stored oxygen is supplied to the respiratory organ via the nasal cannula in synchronization with the patient's inhalation.

In the breathing pattern, the exhalation time is basically longer than the inhalation time, so when the patient, etc. starts to inhale, the oxygen generated in the program cycle of the cycle generation circuit 13 has already been collected and purged. Even during the stroke, the one-way valve 2o installed in front of the storage tank 21 operates, and the oxygen in the storage tank 21 does not flow back toward the adsorption tower 9. At this time, the oxygen stored in the storage tank 21 Since the amount of oxygen required by the patient is sufficiently secured, there is no problem if the opening timing of the magnetic valve 22 for intake synchronization is after the oxygen collection starting timing. For this reason, oxygen can be stably supplied to the respiratory apparatus even if the patient's breathing cycle changes somewhat.

Next, the circuit operation of this embodiment will be explained.

The signal from the sensor 24S is the signal shown as S-1 in FIG. 2, which is an example of a system that detects exhaled and inhaled air based on the temperature of the respiratory gas. In other words, when exhaling, the thermocouple installed at the nostril detects exhaled air warmed by body temperature, which increases the voltage due to thermoelectromotive force, and when inhaling, the lower temperature outside air is inhaled through the sensor. It shows a descending waveform, with each peak point indicating the starting point of exhalation and inspiration.

This signal S-1 is input to the exhalation/inhalation discrimination circuit 14.

This exhalation/inhalation discrimination circuit 14 has a circuit configuration as shown in FIG. That is, IC-1-1 amplifies the signal with an amplifier circuit, IC-1-2 circuit differentiates the waveform with a differentiator circuit,
It is amplified by IC-2-1 and IC-2-2, differentiated by R and C again, and output from the output terminal 27A to S-3 in Figure 2.
An exhalation trigger signal S-3 shown by is output. A signal indicated by S-4 in FIG. 2 is outputted to the output terminal 27B in FIG. 3 only during the intake period created by the circuit of IC-3. This S
The -4 signal opens the intake tuning solenoid valve 22 only during the period in which it is supplied. Further, the output of the terminal 27A is sent to the input terminal 2 of the one cycle generation circuit 13 shown in FIG. 4 via the wiring 4E.
8A.

This cycle generation circuit 13 generates a signal for one cycle of device operation, and here each timing signal is created by a monostable multivibrator circuit (hereinafter simply referred to as a monomulticircuit) 28 shown in FIG. However, in the present invention, the method of creating each cycle time is not limited to this monomulti circuit 28.

Next, to explain the circuit operation, we will consider in advance the time from the start of the 1-cycle operation in which the raw air of the oxygen generator is fed into the adsorption tower 9 until the oxygen gas is stored in the storage tank 21 and can be inhaled by the patient. , it is necessary to set how far in advance of the patient's inspiration the device should be started. This time is created based on exhalation, which precedes inhalation. That is, from the rising edge of the exhalation trigger signal S-3 in FIG.
The end of the 7 delay time (S-7T) determines the time the device operates in advance of the next inspiration. In detail, the exhalation trigger signal S output from the exhalation/inhalation discrimination circuit 14
-3 activates the monomulti circuit of IC-1 in Figure 4,
A delay time S, -7 is created.

This delay time is determined by the capacitor CI and the variable resistor VRI of the circuit IC-1. Then, the falling signal 5-7T of this delay time signal S-7 <I at 28 in FIG.
The IC2 is triggered (activated) at (rising edge of Q2 of , -1) to generate an operation signal S-5 for the first electromagnetic valve 7. This operation signal similarly determines the required ON time of the solenoid valve 7 using the resistor R2 and the capacitor C2. This output is connected to circuit 1 (, 3-2
, the circuit 5SR2 is activated, and the solenoid valve 7 is operated. In addition, the circuit IC3 is triggered at the end of this signal S-5, that is, the falling time of the monomulti circuit, and the stop time S-8 until the solenoid valve 11 is started is determined by the circuit IC3.
Create it with The setting of this time is determined by the values of capacitor C6 and resistor R3 of circuit IC3. At the end of this stop time, that is, at the falling edge of the mono-multi output signal of IC3 (at the rising edge of Q2 of IC3 in the circuit), IC4 is activated to generate the operation signal S-6 of the second solenoid valve]1. This output is amplified by the circuit IC3-1, drives the circuit SSR1, and operates the second mist valve 11. This time is created by the values of resistor R4 and capacitor C4. This signal S-6 is applied to the second solenoid valve 11, and the second solenoid valve 1 opens.

FIG. 5 shows a second embodiment of the present invention.

This embodiment is a first ft magnetic valve 7A having the configuration of the first embodiment.

7B, second solenoid valve 11A, IIB, adsorption tower 9A, 9B,
A plurality of check valves 15A, 15B, orifices 16A, 16B, buffer tanks 17A, 17B, and one-way valves 2OA, 20B are respectively provided, and these plurality of configurations are configured to operate in the same pattern as in the first embodiment. . That is, the cycle generation circuits 13A and 13B are a plurality of cycle generation circuits 13A and 13B, and by alternately using the adsorption towers 9A and 9B, each adsorption tower 9A and 9B operates once every multiple breaths. This is a highly functional device that has improved ability to follow a patient's breathing rate even if it becomes abnormally fast.

However, the control pattern of the intake tuning solenoid valve 22 is
Exhalation/inhalation discrimination circuit 1 is unchanged in both Example 2 and Embodiment 2.
The intake tuning solenoid valve 22 can be controlled by the control signal from 4.

FIG. 6 shown next is a specific example of the cycle generation circuit of the fifth region. Each time the exhalation trigger signal S-3 is input, the flip-flop circuit (IC5) is inverted, and the output terminals Ql and Q2 are inverted.
The output signal is sent to mono multi circuits IC2-1 and IC2-2 via ANDI and AND2. IC
When Ql of 5 is on, ANDI is active and IC2 of 13A
-1 to generate signal S-5-1. This is the 1iii1i! due to the wiring 4H-1! Opening/closing mechanism 8 of valve 7A
A, and the first one opens the magnetic valve 7A. Then, at the falling edge of S-5-1, IC3-1 is triggered in the same manner as described above to create a stop time S-8, and then, at the falling edge of S-8, IC4-1 is triggered, and the second solenoid valve 11A
The operation signal S-6-1 is generated. This is connected to the opening/closing mechanism 12A of the second solenoid valve 11A through 4M-1, and opens the second solenoid valve 11A. Then, the adsorption tower 9A operates in the same manner as in Example 1, and sends oxygen to the storage tank 21 via the buffer tank 17A.

Since Q2 of flip-flop IC5 is turned on at the next exhalation, AND2 is activated this time and activates IC2-2 of 138 to generate signal S-5-2. This is wiring 4H-
2 is connected to the opening/closing mechanism 8B of the first solenoid valve 7B to open the first solenoid valve 7B. Then, at the falling edge of S-5-2, IC3-2 is triggered, and at the falling edge of stop time S-8, IC4-2 is triggered to generate a second operation signal S-6-2 for the magnetic valve 12B. This is connected to the opening/closing mechanism 12B of the magnetic valve 11B through the wiring 4M-2, and opens the second magnetic valve IIB. And adsorption tower 9B
operates and the storage tank 2 is transferred via the buffer tank 17B.
Send oxygen to 1.

In this way, since one series of adsorption tower mechanisms is driven by multiple breaths, time leeway is created and follow-up ability for patients with rapid breathing rates can be improved.

(Effects of the Invention) The novel features of the present invention and its effects are as follows.

(1) Synchronize the oxygen generation cycle of the adsorption tower with one cycle of the breathing pattern of people, etc., and use adsorption towers filled with high-performance adsorbent in a single or double tower type, and It becomes possible to provide an oxygen concentrator that operates with an oxygen concentration program that allows the oxygen generation cycle of the adsorption tower to be operated for only one cycle under optimal conditions.

(2) In an open breathing circuit that supplies concentrated oxygen gas to the respiratory system of a person using an oxygen concentrator and inhales the air mixed with outside air, a temperature detection means installed in front of the nostrils detects temperature changes in the respiratory airflow of the person. (sensor), etc., and the detection signal is differentiated into the expiratory phase and the inspiratory phase by an electronic circuit, and oxygen concentration is carried out in synchronization with each expiratory phase start or arbitrarily delayed by the start of the inspiratory phase. Since the cycle program can be run in one cycle each consisting of an adsorption process, a desorption process, and a purge process, the control system is simple and accurate control is possible.

(3) The generated concentrated oxygen gas can be stored in a buffer tank through a check valve and orifice, and after the desorption process due to reduced pressure is completed, it can be made to flow back from the buffer tank and used for purging. Since it can be used not only in a two-unit system but also in a multi-tower system, it can be controlled regardless of slow breathing rates.

(4) A part of the generated concentrated oxygen gas can be temporarily stored in a storage tank provided for breathing gas, so that the fi-condensed oxygen gas can be stably supplied.

(5) To ensure that the concentrated oxygen gas stored in the storage tank is not used as purge gas for regeneration of the adsorption tower, a one-way valve is provided on the upstream side of the storage tank to ensure a stable supply of concentrated oxygen gas. .

(6) A predetermined amount of the concentrated oxygen gas stored in the storage tank is quickly released by opening the intake synchronized solenoid valve provided for supplying oxygen gas in synchronization with the start of breathing of the person, etc. The inhalation utilization efficiency is increased because it is stably supplied to the respiratory system.

A further summary of the effects of the present invention is as follows.

(1) Since one cycle of oxygen generation only needs to be synchronized with one cycle of breathing, providing a breathing synchronization control eliminates the need for a management mechanism that automatically controls the entire cycle regardless of the breathing rate. can. As a result, the number of component parts of the oxygen concentrator is reduced, so the structure is simple, the system can be simplified, and failures and the like can be reduced.

(2) Furthermore, the adsorption tower may be of a single type or a multi-layer type, and the structure can be simplified if the adsorption tower is made into multiple towers.

Moreover, if the adsorption tower is made of multiple types, the precision of its control can be improved so that it can follow even if the respiration pitch becomes faster.

(3) According to the present invention, the number of component parts is small, and there is no waste in both the suction stroke and the suction effect, making it possible to reduce the size and weight.

(4) Since the storage tank 21 is provided before the intake tuning solenoid valve 22, the amount of concentrated oxygen gas that can be supplied to the patient can be stabilized.

(5) Since the number of component parts is small, manufacturing costs can be expected to be reduced.

(6) Since it can be made smaller, lighter, and more energy efficient, it becomes possible to develop oxygen concentrators for use in vehicles and for portable use.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the respiratory synchronized oxygen generator of the present invention, Fig. 2 is a control signal pattern diagram thereof, and Fig. 3 is a detailed example of the exhalation/inhalation discrimination circuit of the present invention. Circuit diagram: FIG. 4 is a circuit diagram showing a cycle generation circuit of the present invention; FIG. 5 is a circuit diagram showing another embodiment of the present invention; FIG. 6 is a circuit diagram showing an example of details of the cycle generation circuit. It is. 1...Power supply IA...Power switch 2...Driving circuit 3...Compressor 4A, 4B, 4C, 4D, 4E, 4F, 4G. 4H, 4M...Conductor 5A 5B, 5C, 5D, 5E, 5F, 5G5H・-
- Conduit 6... Surge tank 7.7A, 7B... First solenoid valve 8.8A, 8B... Opening/closing mechanism of first solenoid valve 9.9A,
9B... Adsorption tower 10... Silencer 11, IIA, IIB... Second solenoid valve 12.12
A, 12B... Second solenoid valve opening/closing mechanism 13.13A
, 13B... Cycle generation circuit 14... Exhalation/inhalation discrimination circuit 15.15A, 15B... Check valve 16.16A, 16B... Orifice 17.17A
, 17B...Buffer tank 18...Driving valve 19...Driving valve opening/closing mechanism 20.20A, 20B...One-way valve 21...Storage tank 22...Intake tuning solenoid valve 23... Inhalation synchronized solenoid valve opening/closing mechanism 24...Nasal cannula 24S...Respiration sensor S, -1...Respiration signal S-2...Inhalation trigger signal S-3...Expiration trigger signal S-4 ...Intake synchronized solenoid valve drive signal S-5...First solenoid valve drive signal S-6...Second fli valve drive signal S-7...Delay time signal S-8...Stop time signal 26...Exhalation/inhalation discrimination circuit 27...Differential circuit 28...Single-base adsorption tower cycle generation circuit 29...
Cycle generation circuit for double-column adsorption tower Figure 1 Figure 5

Claims (1)

[Claims] 1. One or more adsorption towers filled with an adsorbent that selectively and quickly adsorbs nitrogen in compressed air, and a first electromagnetic valve connected to the inlet of the adsorption tower. a compressor or compressed air source connected to the inhaler, a second solenoid valve that intermittently opens the inlet to atmospheric pressure or a negative pressure source, and an inhaler installed at or near the inhaler to detect the phase of respiration of a person, etc. an exhalation/inhalation discrimination circuit that discriminates between the inhalation phase and expiration phase based on changes in the output of this sensor and sends the necessary signals, and a signal from the discrimination circuit that starts the expiration phase or inspiratory phase of the breathing cycle. At the same time, or at a time that is electrically delayed arbitrarily from the start of these breathing signals, the first solenoid valve is opened to introduce compressed air into the adsorption tower, pressurize it until it reaches a constant pressure, and then An adsorption tower through which concentrated oxygen gas passes, and then a first solenoid valve is closed and a second solenoid valve is opened to contain a large amount of nitrogen and moisture adsorbed from the adsorption tower to an atmospheric pressure or negative pressure source. A cycle generation circuit that program-controls a desorption purge phase that eliminates gas in an optimal pattern for each cycle, a buffer tank that stores concentrated oxygen gas that has been generated and passed through the adsorption tower; A storage tank is connected through a valve, and the storage tank and the inhalation device are connected by a conduit through an inspiratory tuning solenoid valve, and a signal from the exhalation phase/inspiration phase discrimination circuit is used to detect the beginning of the inspiratory phase of the breathing cycle. The intake synchronized solenoid valve is opened in synchronization with , and the stored concentrated oxygen gas is exhaled all at once and sent to the inhaler.Then, after a predetermined time or in synchronization with the beginning of the next exhalation, the intake synchronized solenoid valve is opened. A medical oxygen concentrator characterized in that the valve is configured to close. 2. The concentrated oxygen gas produced from the adsorption tower is stored in the buffer tank, and is used for purging the adsorption tower during the desorption phase when the second electromagnetic valve is opened. After reaching the pressure, it is stored in another storage tank via a one-way valve in the opposite direction, and then synchronized with the beginning of the intake phase when the intake synchronization valve is opened to stably supply a predetermined amount or more of concentrated oxygen gas. The medical oxygen concentrator of claim 1, wherein the medical oxygen concentrator is configured to be delivered. 3. An orifice-shaped gas passage with a certain degree of constriction and a check valve are installed after the adsorption tower, so that when the pressure exceeds a certain pressure, a large amount of concentrated oxygen gas generated in the adsorption tower flows toward the buffer tank. However, during the desorption purge process, the structure is configured so that only the amount necessary for purging can flow back into the adsorption tower, and another storage tank is provided downstream of the buffer tank via a one-way valve, and further downstream of that. Claim 1, further comprising: an intake synchronized solenoid valve that opens and closes in synchronization with a signal from the exhalation/inhalation discrimination circuit; and an inhalation device that blows the concentrated oxygen gas into the respiratory organ of the person. Oxygen concentrator as described. 4. A process in which a breathing sensor synchronizes with the temperature of breathing and extracts a breathing signal, and an inhalation trigger signal and an exhalation trigger signal are generated depending on the peaks and troughs of the breathing signal in the exhalation/inspiration discrimination circuit that receives the breathing signal from the sensor. In the step of taking out the signal, and in the cycle generation circuit receiving the inhalation trigger signal and the expiration trigger signal, a trigger signal is generated to start the cycle generation circuit after an appropriate delay time from the inhalation or expiration trigger signal, and this causes the first trigger signal to be activated. A step of opening a solenoid valve, a step of keeping the pressure in a pressurized state until it reaches a constant pressure, and then a step of opening a second solenoid valve and discharging the gas in the adsorption tower to the atmosphere or a negative pressure source while generating concentrated oxygen. The medical oxygen concentrator according to any one of claims 1 to 3, further comprising a step of regenerating an adsorbent in an adsorption tower using a part of the gas. 5. Single or double adsorption system filled with an adsorbent that selectively and quickly adsorbs nitrogen in compressed air to supply concentrated oxygen gas to the human respiratory system with the breathing circuit open to the outside air. a tower, a compressor or compressed air source connected to the inlet of the adsorption tower via a first solenoid valve, and a second solenoid valve that intermittently opens the inlet to atmospheric pressure or a negative pressure source; A sensor installed on or near the inhaler to detect the phase of a person's breathing, and a trigger signal required to generate a cycle by distinguishing between the inhalation phase and expiration phase based on changes in the output of this sensor, and the opening/closing of the inhalation synchronized solenoid valve. a first electromagnetic valve that opens and closes a compressed air supply passage to the adsorption tower based on a trigger signal to which a delay time is added based on the signal from the expiration/intake discrimination circuit; It has a built-in program that sets the opening/closing timing of the second solenoid valve that opens and closes the passage connecting the silencer or negative pressure source communicating with the atmosphere to the adsorption tower and exhausts the adsorption tower.
In a respiration synchronized oxygen concentrator system having a cycle generation circuit which receives a trigger signal supplied from an inhalation discrimination circuit and commands operation for each cycle, a process of extracting a respiration signal from the sensor in response to the temperature of respiration, etc. In the exhalation/inhalation discrimination circuit that inputs the respiration signal from the sensor,
In the process of extracting the inspiratory trigger signal and expiratory trigger signal according to the peaks and troughs of the breathing signal, and in the cycle generation circuit that receives the inspiratory trigger signal and the expiratory trigger signal, an appropriate pause time is determined from the inspiratory trigger signal or the expiratory trigger signal. creating a trigger signal to start the cycle, thereby activating the first solenoid valve, and then, after waiting for a certain amount of concentrated oxygen gas to pass through while pressurized to a certain pressure, the second solenoid valve is activated. It is characterized by comprising a cycle generating means in which one cycle includes the step of opening and the step of activating the drive signal of the intake synchronized solenoid valve in synchronization with the intake trigger signal subsequent to the intake trigger signal or the expiration trigger signal. Medical oxygen concentration method.