JP2002253675A - Apparatus for concentrating oxygen for medical use - Google Patents
Apparatus for concentrating oxygen for medical useInfo
- Publication number
- JP2002253675A JP2002253675A JP2001054039A JP2001054039A JP2002253675A JP 2002253675 A JP2002253675 A JP 2002253675A JP 2001054039 A JP2001054039 A JP 2001054039A JP 2001054039 A JP2001054039 A JP 2001054039A JP 2002253675 A JP2002253675 A JP 2002253675A
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- Japan
- Prior art keywords
- oxygen
- oxygen concentration
- air
- inverter
- frequency
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気中から酸素を
分離し濃縮する医療用の酸素濃縮装置に関する。更に詳
細には、酸素濃縮装置の気体圧縮手段（以後、コンプレ
ッサとも称す）用の電動機を制御する事により、使用者
に対して安定した濃度で酸素濃縮空気を供給する事が出
来る酸素濃縮装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical oxygen concentrator for separating and concentrating oxygen from air. More specifically, the present invention relates to an oxygen concentrator which can supply oxygen-concentrated air to a user at a stable concentration by controlling an electric motor for gas compression means (hereinafter also referred to as a compressor) of the oxygen concentrator. .
【０００２】[0002]
【従来の技術】近年、喘息、肺気腫症、慢性気管支炎な
どの呼吸器系疾患に苦しむ患者が増加する傾向がある
が、その最も効果的な治療法の一つとして酸素吸入療法
があり、空気中から酸素濃縮気体を直接分離する酸素濃
縮装置が開発され、使用時の利便性、保守管理の容易さ
から酸素吸入療法用の治療装置として、次第に普及する
ようになってきている。2. Description of the Related Art In recent years, the number of patients suffering from respiratory diseases such as asthma, emphysema and chronic bronchitis tends to increase. One of the most effective treatments is oxygen inhalation therapy. Oxygen concentrators for directly separating oxygen-enriched gas from the inside have been developed, and are becoming increasingly popular as therapeutic devices for oxygen inhalation therapy because of their convenience in use and ease of maintenance.
【０００３】かかる酸素濃縮装置として、窒素を選択的
に吸着し得る吸着剤を１個或いは、複数の吸着床に充填
した吸着型酸素濃縮装置が知られ、中でも空気供給手段
としてコンプレッサを用いた圧力変動吸着型酸素濃縮装
置が多用されている。かかる装置は、通常、窒素を選択
的に吸着し得る吸着剤を充填した１個或いは複数の吸着
床にコンプレッサから圧縮空気を供給して加圧状態で窒
素を吸着させることにより酸素濃縮気体を得る吸着工程
と、吸着床の内圧を減少させて窒素を脱着させ吸着剤の
再生を行う脱着工程を一定サイクルで繰り返し行い、更
に必要に応じて、脱着工程終了直前に、既に生成した乾
燥酸素濃縮気体を一部逆流させ再生効率の向上と昇圧を
目的とする均圧工程を加えて、順次一定サイクルで行う
ことにより酸素濃縮気体を得る装置である。[0003] As such an oxygen concentrator, an adsorbent oxygen concentrator in which one or more adsorbents capable of selectively adsorbing nitrogen are filled in an adsorbent bed is known. Among them, a pressure using a compressor as an air supply means is known. A variable adsorption type oxygen concentrator is frequently used. Such an apparatus generally obtains an oxygen-enriched gas by supplying compressed air from a compressor to one or more adsorption beds filled with an adsorbent capable of selectively adsorbing nitrogen and adsorbing nitrogen in a pressurized state. The adsorption step and the desorption step of desorbing nitrogen by reducing the internal pressure of the adsorption bed to regenerate the adsorbent are repeated in a constant cycle, and if necessary, immediately before the end of the desorption step, immediately before the completion of the desorption step, dry oxygen-enriched gas already generated This is a device for obtaining an oxygen-enriched gas by performing a constant pressure cycle in order to improve the regeneration efficiency and increase the pressure by partially backflowing the gas, and sequentially performing the same in a constant cycle.
【０００４】近年、半導体集積技術の飛躍的進歩により
信頼性の高い小型インバータが汎用化している。インバ
ータは電圧と周波数を制御することでトルク一定での回
転数制御が行えることにより比較的安価な誘導モータを
用いて精度の高いプロセス制御機器が実現でき、現在、
広く実用化されている。In recent years, small inverters with high reliability have been widely used due to the dramatic progress of semiconductor integrated technology. The inverter controls the voltage and frequency to control the number of rotations with a constant torque, so that a highly accurate process control device can be realized using a relatively inexpensive induction motor.
Widely used in practice.
【０００５】一方、在宅医療分野において適用される機
器は商用交流電源で使用するものが殆どであるが、一般
家庭用電源にて使用できるインバータが汎用的でないこ
と、またそのために開発コストが高くなることやインバ
ータ機器は高調波ノイズを発生しやすいなどの理由によ
りインバータが使用されることは少なかった。そのた
め、現在まで在宅などで使用される医療用酸素濃縮装置
に使用されているコンプレッサは、全て商用交流電源に
より直接誘導モータを駆動する方式である。On the other hand, most of the equipment used in the home medical field uses a commercial AC power supply. However, an inverter that can be used with a general household power supply is not general-purpose, and the development cost is high. Inverters are rarely used because of the fact that harmonic noise is likely to occur in inverter equipment. For this reason, all compressors used in medical oxygen concentrators used at home or the like to date have a direct drive of an induction motor by a commercial AC power supply.
【０００６】しかし、最近のＥＭＣ対策技術の進歩によ
り、インバータ使用時においても医療規格を充分満足で
きるようになり、インバータ機器を組み込んだ酸素濃縮
装置を製作できるようになってきた。かかる技術を利用
して、５０Hz,６０Hzの地域による周波数の違いの問題
を解決する為、交流電源を直流化し更に交流に変換する
インバータ搭載の酸素濃縮装置も考えられている。[0006] However, recent advances in EMC countermeasure technology have made it possible to sufficiently satisfy medical standards even when an inverter is used, and to manufacture an oxygen concentrator incorporating an inverter device. In order to solve the problem of the difference in frequency between the regions of 50 Hz and 60 Hz using such a technology, an oxygen concentrator equipped with an inverter that converts an AC power supply into a DC power and further converts the AC power into an AC power has been considered.
【０００７】[0007]
【発明が解決しようとする課題】通常、患者が吸入に必
要な酸素量は症状により異なり、インバータを使用しな
い従来の直接駆動方式ではコンプレッサを一定回転数で
しか運転できず、濃縮した酸素の内の必要な酸素量のみ
を供給し、不要分は無駄に大気中へ放出していた。ま
た、吸着剤の劣化等の経時変化により吸着筒の窒素吸着
性能の低下、酸素生成能の低下が生じるが、吸着剤の交
換などオーバーホール以外に対処する事が出来ないのが
現状である。Normally, the amount of oxygen required for inhalation by a patient varies depending on symptoms, and a conventional direct drive system without an inverter can only operate a compressor at a constant rotation speed. Only the necessary amount of oxygen was supplied, and unnecessary parts were wasted to the atmosphere. In addition, the deterioration of the adsorbent with the passage of time causes a decrease in the nitrogen adsorbing performance of the adsorber and a decrease in the oxygen generating ability.
【０００８】従来のインバータ搭載の酸素濃縮装置も、
商用交流電源の周波数問題を解消するのみに用いられて
おり、このような吸着性能の劣化、酸素濃度の低下には
全く対応が出来ないなど、患者への長期に渡って安定し
た酸素供給を行なう点において大きな問題があった。[0008] Conventional oxygen concentrators equipped with inverters,
It is used only to solve the frequency problem of commercial AC power supply, and does not respond to such deterioration of adsorption performance and oxygen concentration at all, and provides stable oxygen supply to patients for a long time. There was a big problem in point.
【０００９】本発明はかかる状況を鑑みてなされたもの
で、酸素濃度変動が発生する場合においても安定して所
定の設定濃度の酸素濃縮空気を供給できるコンプレッサ
用誘導モータ制御機能を備えた酸素濃縮装置の提供を目
的としたものである。The present invention has been made in view of the above circumstances, and has an oxygen concentrator having an induction motor control function for a compressor capable of stably supplying oxygen-concentrated air of a predetermined concentration even when an oxygen concentration fluctuation occurs. It is intended to provide a device.
【００１０】[0010]
【課題を解決するための手段】本発明者はかかる問題に
対して鋭意検討した結果、以下の医療用酸素濃縮装置を
見出した。すなわち本発明は、酸素よりも窒素を選択的
に吸着する吸着剤を充填した吸着筒と該吸着筒に空気を
供給する為の電動機駆動の空気圧縮手段を備えた酸素濃
縮装置において、生成酸素濃縮空気の酸素濃度を検知す
る酸素濃度検知手段を備え、検知結果に基づいて該空気
圧縮手段の電動機回転数を制御する制御手段を備えるこ
とを特徴とする医療用酸素濃縮装置を提供するものであ
る。Means for Solving the Problems As a result of intensive studies on the above problem, the present inventors have found the following medical oxygen concentrator. That is, the present invention relates to an oxygen concentrator including an adsorption column filled with an adsorbent that selectively adsorbs nitrogen rather than oxygen and an electric motor-driven air compression means for supplying air to the adsorption column. A medical oxygen concentrator is provided, comprising: oxygen concentration detecting means for detecting the oxygen concentration of air, and control means for controlling the number of revolutions of a motor of the air compression means based on the detection result. .
【００１１】また本発明は、かかる電動機が商用交流電
源を使用する誘導電動機であり、該制御手段がインバー
タ手段を備え、該酸素濃度検知手段の結果に基づいて、
該インバータ手段により周波数を制御する手段であるこ
とを特徴とする医療用酸素濃縮装置を提供するものであ
る。Further, according to the present invention, the motor is an induction motor using a commercial AC power supply, the control means includes an inverter means, and based on a result of the oxygen concentration detecting means,
Another object of the present invention is to provide a medical oxygen concentrator characterized in that the inverter controls the frequency.
【００１２】また本発明は、かかる制御手段が、所定酸
素濃度閾値を外れた場合、周波数変更後、該酸素濃度検
出手段の応答時間以上の時間経過後の酸素濃度検知結果
に基づいて、該インバータ手段の周波数を再度制御する
手段を備えることを特徴とする医療用酸素濃縮装置を提
供するものである。In addition, the present invention provides a method for controlling the inverter based on a result of detecting an oxygen concentration after a change in frequency and a response time longer than a response time of the oxygen concentration detecting means when the control means deviates from a predetermined oxygen concentration threshold value. An object of the present invention is to provide a medical oxygen concentrator comprising means for controlling the frequency of the means again.
【００１３】[0013]
【発明の実施の形態】本発明の医療用酸素濃縮装置の概
略図を図１に示す。かかる酸素濃縮装置１は、酸素より
も窒素を選択的に吸着する吸着剤として５A型ゼオライ
トを充填した吸着筒６にコンプレッサ５により加圧空気
を供給し、酸素濃度９２％の酸素濃縮ガスを取り出し、
サージタンクに貯溜した後、加湿器を経由して使用者で
ある呼吸器疾患患者に３L/minで供給する１２筒式の圧
力変動吸着型酸素濃縮装置である。FIG. 1 is a schematic view of a medical oxygen concentrator according to the present invention. In the oxygen concentrator 1, compressed air is supplied by a compressor 5 to an adsorption column 6 filled with 5A zeolite as an adsorbent for selectively adsorbing nitrogen rather than oxygen, and an oxygen-enriched gas having an oxygen concentration of 92% is taken out. ,
This is a 12-cylinder pressure fluctuation adsorption type oxygen concentrator that is stored in a surge tank and supplied to a user, a respiratory disease patient, at a rate of 3 L / min via a humidifier.
【００１４】尚、吸着筒などの吸着型酸素濃縮装置の基
本構成は、例えば特表平７−５０８２０５号公報などに
記載の米国SeQual社製の１２本の吸着筒をロータリーバ
ルブを用いて流路を順次切り替える事により吸脱着を繰
り返し連続して酸素濃縮空気を取り出すモジュールを利
用した装置であり、本発明の特徴部分であるコンプレッ
サの制御部分のブロック図を図１に示す。The basic structure of an adsorption-type oxygen concentrator such as an adsorption cylinder is, for example, a method in which twelve adsorption cylinders manufactured by SeQual of the United States described in Japanese Patent Publication No. 1 is a block diagram of a control part of a compressor, which is a device utilizing a module that repeatedly takes out and desorbs oxygen by repeatedly switching adsorption and desorption so as to continuously extract oxygen-enriched air.
【００１５】酸素濃縮装置１を駆動するための単相１０
０Ｖの商用交流電源を使用し、単相の誘導モータ４によ
りコンプレッサ５を駆動させ、加圧空気を吸着筒６に供
給すると共に、単相誘導モータ４の回転を制御するイン
バータ３を備え、内部には交流電源を直流に変換する位
相制御整流器、所定周波数となるようにパルス幅設定値
を演算するパルス幅変調調節器を備える。生成した酸素
濃縮空気の酸素濃度を酸素濃度センサー７により検知
し、かかる検知結果に基づいて制御器２によりインバー
タ３の出力周波数を制御し、誘導モータ４の回転を制御
する。Single phase 10 for driving oxygen concentrator 1
A 0 V commercial AC power supply is used, and a compressor 5 is driven by a single-phase induction motor 4 to supply pressurized air to an adsorption cylinder 6 and an inverter 3 for controlling the rotation of the single-phase induction motor 4. Includes a phase control rectifier for converting an AC power supply to a DC power, and a pulse width modulation controller for calculating a pulse width set value so as to have a predetermined frequency. The oxygen concentration of the generated oxygen-enriched air is detected by the oxygen concentration sensor 7, and based on the detection result, the controller 2 controls the output frequency of the inverter 3 and controls the rotation of the induction motor 4.
【００１６】酸素濃縮器１に用いる商用交流電源は日本
では単相１００Ｖで周波数に関しては地域別に５０Ｈｚ
と６０Ｈｚの２種類が存在する。誘導モータ４の回転に
対し、この周波数の違いの影響を除去するため、インバ
ータ３に内蔵される位相制御整流器を介し直流に変換す
る。尚、本実施態様例ではコンプレッサ５には周波数６
０Ｈｚ、電圧１００Ｖ±１０％まで使用可能な誘導御モ
ータ４を有するＴＨＯＭＡＳ社製の型式２５０５ＣＳ２
８を使用し、インバータ３にはＡＮＡＣＯＮＳＹＳＴＥ
ＭＳ社製の型式ＳＯ１６１００３Ａを使用した。The commercial AC power supply used for the oxygen concentrator 1 is a single-phase 100 V in Japan and has a frequency of 50 Hz in each region.
And 60 Hz. In order to eliminate the influence of this difference in frequency on the rotation of the induction motor 4, the rotation is converted to DC through a phase control rectifier built in the inverter 3. In this embodiment, the compressor 5 has a frequency of 6
Model 2505CS2 manufactured by THOMAS having an induction control motor 4 that can be used up to 0 Hz and a voltage of 100 V ± 10%.
8 and the inverter 3 uses ANACONSYSTE
MS Model SO161003A was used.
【００１７】通常の出荷設定時の酸素濃縮装置１は濃縮
後の酸素濃度が９２％±３％になるように調整している
が、吸着剤の経時的な変化により窒素吸着性能の低下が
発生する場合がある。また使用環境が低温状態での起動
初期などにおいては吸着剤性能が充分に発揮できずに装
置が温まるまで若干酸素濃度が低いガスが発生する場合
もある。Although the oxygen concentration apparatus 1 at the time of normal shipment is adjusted so that the oxygen concentration after concentration becomes 92% ± 3%, the nitrogen adsorbing performance is lowered due to the change over time of the adsorbent. May be. Also, in the early stage of startup in a low-temperature use environment, the adsorbent performance may not be sufficiently exhibited, and a gas having a slightly lower oxygen concentration may be generated until the apparatus is warmed up.
【００１８】酸素濃縮装置１では、図２に示すようにコ
ンプレッサ５の回転速度と比例関係にあるインバータ３
の出力周波数と、酸素濃度との間には単調増加の関係が
ある。出荷設定においては、誘導モータ４は、その１０
０％以下の能力で酸素濃度９２％の酸素濃縮空気生成を
実現している。In the oxygen concentrator 1, as shown in FIG.
There is a monotonically increasing relationship between the output frequency and the oxygen concentration. In the factory setting, the induction motor 4
Oxygen-enriched air generation with an oxygen concentration of 92% is realized with a capacity of 0% or less.
【００１９】酸素濃縮装置の起動時、或は運転中に、酸
素濃度センサ７（本実施例ではフジクラ製ＦＣＸ−ＭＷ
を使用した）により計測した酸素濃度が予め設定してお
いた設定値（本実施例では９０％とした）以下になった
際には、制御器２からインバータ３に対して、コンプレ
ッサ５に接続している誘導モータ４を所定量の回転速度
（本実施例では１Ｈｚ増加とした）だけ上昇させる制御
信号を発信する。かかる制御により吸着筒６内の圧力を
高めることが可能となり、生成する酸素濃縮空気の酸素
濃度を９２％まで回復させることが可能となる。At the time of starting or operating the oxygen concentrator, the oxygen concentration sensor 7 (FCX-MW manufactured by Fujikura in this embodiment) is used.
When the measured oxygen concentration falls below a preset value (90% in this embodiment), the controller 2 connects the inverter 3 to the compressor 5. A control signal for raising the rotating speed of the induction motor 4 is increased by a predetermined amount (in this embodiment, increased by 1 Hz). With this control, the pressure in the adsorption cylinder 6 can be increased, and the oxygen concentration of the generated oxygen-enriched air can be restored to 92%.
【００２０】酸素濃度センサ７の応答時間以上経過後
（本実施例では１分とした）の酸素濃度を確認して目標
酸素濃度９２％に未達であれば、さらに同様に回転速度
を上昇させてゆき、９２％を越えるまで行うことによ
り、吸着圧の増加による窒素の吸着量の増加を実現し結
果的に、９２％を越える酸素濃度まで回復させることが
可能となる。The oxygen concentration after the response time of the oxygen concentration sensor 7 has elapsed (one minute in this embodiment) is checked. If the target oxygen concentration does not reach 92%, the rotation speed is further increased. By increasing the pressure until it exceeds 92%, the amount of nitrogen adsorbed is increased by increasing the adsorption pressure, and as a result, it is possible to recover the oxygen concentration to more than 92%.
【００２１】尚、本実施態様例では、以上の方法を行っ
た後に再び吸着筒７内の吸着剤が性能劣化限界に達し、
誘導モータ４を１００％運転しているにもかかわらず、
酸素濃度が８９％以下に低下した場合には、吸着剤の交
換を知らせるランプを点灯させることで、患者へ酸素濃
縮装置の整備時期を警報する機能も備える。In this embodiment, after the above method is performed, the adsorbent in the adsorption column 7 again reaches the performance deterioration limit,
Despite operating the induction motor 4 100%,
When the oxygen concentration drops to 89% or less, a function is provided to warn the patient of the maintenance time of the oxygen concentrator by turning on a lamp for notifying the replacement of the adsorbent.
【００２２】[0022]
【発明の効果】本発明は、上述の如く、酸素濃縮装置の
吸着筒において若干の能力劣化が生じた場合においても
安定して所定濃度の酸素を供給できるコンプレッサ用誘
導モータ制御ができるようになった。このように本発明
は、酸素濃縮装置の制御に大きな寄与をなすものであ
る。As described above, according to the present invention, it is possible to control the induction motor for a compressor which can stably supply a predetermined concentration of oxygen even when the capacity of the adsorption cylinder of the oxygen concentrator is slightly deteriorated. Was. As described above, the present invention greatly contributes to the control of the oxygen concentrator.
【図１】酸素濃縮装置内部構成のブロック図である。FIG. 1 is a block diagram of the internal configuration of an oxygen concentrator.
【図２】出力周波数と酸素濃度との関係を表す実験デー
タのグラフである。FIG. 2 is a graph of experimental data showing a relationship between an output frequency and an oxygen concentration.
１ 酸素濃縮装置 ２ 制御器 ３ インバータ ４ 誘導電動機 ５ コンプレッサ ６ 吸着筒 ７ 酸素濃度センサ DESCRIPTION OF SYMBOLS 1 Oxygen concentrating apparatus 2 Controller 3 Inverter 4 Induction motor 5 Compressor 6 Adsorption cylinder 7 Oxygen concentration sensor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 今村 義治 大阪府茨木市耳原３丁目４番１号 帝人株 式会社大阪研究センター内 Ｆターム(参考） 4D012 CA05 CB15 CD07 CE01 CE02 CF02 CF03 CJ01 CJ03 4G042 BA15 BC04 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshiharu Imamura 3-4-1, Amihara, Ibaraki-shi, Osaka Teijin Limited Osaka Research Center F-term (reference) 4D012 CA05 CB15 CD07 CE01 CE02 CF02 CF03 CJ01 CJ03 4G042 BA15 BC04
Claims (3)
剤を充填した吸着筒と該吸着筒に空気を供給する為の電
動機駆動の空気圧縮手段を備えた酸素濃縮装置におい
て、生成酸素濃縮空気の酸素濃度を検知する酸素濃度検
知手段を備え、検知結果に基づいて該空気圧縮手段の電
動機回転数を制御する制御手段を備えることを特徴とす
る医療用酸素濃縮装置。1. An oxygen concentrator comprising: an adsorption column filled with an adsorbent for selectively adsorbing nitrogen rather than oxygen; and an electric motor-driven air compression means for supplying air to the adsorption column. A medical oxygen concentrator comprising: oxygen concentration detection means for detecting the oxygen concentration of air; and control means for controlling the motor rotation speed of the air compression means based on the detection result.
電動機であり、該制御手段がインバータ手段を備え、該
酸素濃度検知手段の結果に基づいて、該インバータ手段
により周波数を制御する手段であることを特徴とする請
求項１記載の医療用酸素濃縮装置。2. The electric motor is an induction motor using a commercial AC power supply, and the control means includes an inverter means, and the frequency is controlled by the inverter means based on a result of the oxygen concentration detecting means. The medical oxygen concentrator according to claim 1, wherein:
た場合、周波数変更後、該酸素濃度検出手段の応答時間
以上の時間経過後の酸素濃度検知結果に基づいて、該イ
ンバータ手段の周波数を再度制御する手段を備えること
を特徴とする請求項２記載の医療用酸素濃縮装置。3. When the control means deviates from a predetermined oxygen concentration threshold value, after the frequency is changed, the frequency of the inverter means is determined based on the oxygen concentration detection result after a lapse of time equal to or longer than the response time of the oxygen concentration detection means. 3. The medical oxygen concentrator according to claim 2, further comprising means for controlling again.
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| JP2001054039A JP2002253675A (en) | 2001-02-28 | 2001-02-28 | Apparatus for concentrating oxygen for medical use |
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| JP2001054039A JP2002253675A (en) | 2001-02-28 | 2001-02-28 | Apparatus for concentrating oxygen for medical use |
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| JP2001054039A Pending JP2002253675A (en) | 2001-02-28 | 2001-02-28 | Apparatus for concentrating oxygen for medical use |
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|---|---|---|---|---|
| US7306657B2 (en) | 2003-10-28 | 2007-12-11 | Ngk Spark Plug Co., Ltd. | Oxygen concentrating apparatus |
| JP2008295594A (en) * | 2007-05-29 | 2008-12-11 | Ngk Spark Plug Co Ltd | Oxygen concentrator |
| WO2009063938A1 (en) | 2007-11-15 | 2009-05-22 | Teijin Pharma Limited | Oxygen concentrator |
| US7682428B2 (en) | 2003-08-26 | 2010-03-23 | Teijin Pharma Limited | Oxygen concentration apparatus |
| JP2010537779A (en) * | 2007-09-06 | 2010-12-09 | イノヴァ ラブス，インコーポレイテッド | Oxygen concentrator and method |
| WO2011052803A1 (en) | 2009-11-02 | 2011-05-05 | 帝人ファーマ株式会社 | Oxygen enrichment device |
| JP2012513230A (en) * | 2008-12-22 | 2012-06-14 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Liquid oxygen production apparatus and method |
| WO2014046297A1 (en) | 2012-09-20 | 2014-03-27 | 帝人ファーマ株式会社 | Oxygen concentration device |
| US9440036B2 (en) | 2012-10-12 | 2016-09-13 | InovaLabs, LLC | Method and systems for the delivery of oxygen enriched gas |
| US9440180B2 (en) | 2012-10-12 | 2016-09-13 | Inova Labs, Llc | Oxygen concentrator systems and methods |
| US9440179B2 (en) | 2014-02-14 | 2016-09-13 | InovaLabs, LLC | Oxygen concentrator pump systems and methods |
| US9717876B2 (en) | 2012-10-12 | 2017-08-01 | Inova Labs, Inc. | Dual oxygen concentrator systems and methods |
| WO2017146271A1 (en) | 2016-02-24 | 2017-08-31 | 帝人ファーマ株式会社 | Oxygen concentrator |
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| US7306657B2 (en) | 2003-10-28 | 2007-12-11 | Ngk Spark Plug Co., Ltd. | Oxygen concentrating apparatus |
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