JP2011143260A - 改良された空気流量平坦化検出機能を有する呼吸装置 - Google Patents
改良された空気流量平坦化検出機能を有する呼吸装置 Download PDFInfo
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- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
- A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
- A61M2016/0033—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical
- A61M2016/0039—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical in the inspiratory circuit
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Abstract
【解決手段】この閉塞指数を用いて正常な呼吸と閉塞を伴う呼吸を識別する。閉塞指数は、空気流量信号の幾つかのセクションに付与される異なる重み係数に基づいて算定され、それによっていろいろな異なるタイプの呼吸閉塞に対する感度を高める。
【選択図】図2
Description
図3は、健康な人と、気道に部分閉塞を有する人の典型的な呼吸サイクルの吸気部分に関する空気流量信号を示すグラフである。図にみられるように、健康(正常)な人の呼吸サイクルでは、その吸気部分中、空気流量は、吸気とともに滑らかに上昇し、ピークに達し、滑らかにゼロにまで下降する。これに対して、気道に部分閉塞をもつ患者は、吸気期間中に有意の平坦帯域を有することを特徴とする呼吸パターンを示す。理論的には、閉塞空気流(閉塞によって阻害されている空気流)の場合、部分閉塞の度合が高くなるほど(完全閉塞に近づくほど)、吸気期間の空気流量信号は、方形波に近くなる。
A1.fi>M ならば、Wi=1
A2.fi<M ならば、Wi=0.5
B1.fiが吸気中心時点より前に採取されたものである場合は、Vi=0.75
B2.fiが吸気中心時点より後に採取されたものである場合は、Vi=1.25
ここで、jは、吸気流量曲線Fの中間部分又は中間半分において最初のサンプルであり、kは最後のサンプルである。dは、図3〜6に示されるような吸気期間の中間部分又は中間半分のサンプルの数であり、Mは、吸気流量曲線Fの平均値である。
・流量サンプルを、それらが許容しうる上下限内の形状を有する有効な吸気サイクルを表すものであることを確認するためにチェックする。
・サンプルをトリミングして吸気期間前のサンプルを排除する。
・吸気流量サンプルの平均値を求める。
・吸気期間の中間部分又は中間半分のサンプルについて、各流量サンプルの、平均値からの重みつき絶対差を合計する。
流量サンプル>平均値ならば、そのサンプルの平均値との差をそのまま合算 する。
流量サンプル<平均値ならば、そのサンプルの平均値との差の2分の1を合 算する。
流量サンプルが吸気中心時点より前に採取されたものである場合は、そのサ ンプルの平均値との差の75%を用いる。
流量サンプルが吸気中心時点より後に採取されたものである場合は、そのサ ンプルの平均値との差の125%を用いる。
・上記の和を下記のように吸気流量の平均値と吸気時間によって変倍(倍率変 更)して平坦化指数を算出する:
FFI=重みつき絶対和/(吸気中間半分の時間×吸気流量の平均値)
(1)流量がピーク吸気流量の75%に達した点を確定する工程と、
(2)流量がピーク吸気流量の25%に達した点を確定する工程と、
(3)吸気の開始点を確認するために上記2つの点を通りゼロ流量の線に至る線を外挿する工程から成る方法である。ただし、この工程(3)において開始点が最初のサンプルの左側に存在する場合は、最初のサンプルを採用する。
12 マスク
14 ブロア
16 チューブ、可撓チューブ
18 モータ
20 サーボ、サーボ制御器
22 空気吐出口
24 制御回路
26 排気ポート
28 流れ制限部材
30,31 チューブ
32 マスク圧トランスジューサ
33 チューブ
34 差圧トランスジューサ
36 増幅器
38 増幅器
40 フィルタ
42 ADC変換器
44 マイクロプロセッサ
46 DAC変換器
A ローブ
B ローブ
C 平坦な帯域
D ローブ
E 平坦部分
F 吸気流量曲線、呼吸曲線
fi 吸気流量サンプル、信号
L 近似線
LL 下限曲線
M 吸気流量平均値、平均値
UL 上限曲線
Vi 時間依存係数
Wi 値依存係数
Claims (8)
- 患者の気道内の障害を判定するための装置であって、
患者の呼吸の吸気期間における空気流を感知し、患者の気道内の空気流を表わすセンサー信号を発生するためのセンサーと、
該センサーに結合され、連続する重み係数を使用して該センサーの連続するサンプルを処理し、連続する重み付きサンプルを得るためのメカニズムと、
該重み付きサンプルに基づく関数を障害閾値と比較し、気道障害の存在を判定するためのプロセッサーと、
を具備してなり、
前記関数が、患者の呼吸の吸気期間の平坦性を尺度であることを特徴とするもの。
- 患者の気道内の障害を判定するための方法であって、
呼吸サイクルの吸気期間において、患者の気道内の空気流を表わす信号を発生させる工程と、
連続する重み係数を使用して、発生した信号の連続するサンプルを処理し、連続する重み付きサンプルを得る工程と、
該重み付きサンプルに基づく関数の値を障害閾値と比較し、気道障害の存在を判定する工程と、
を具備してなり、
前記関数が、患者の呼吸の吸気期間の平坦性を尺度であることを特徴とするもの。
- 前記連続する重み係数のそれぞれが、各サンプルの振幅に基づいて決定されることを特徴とする請求項1に記載の装置。
- 前記連続する重み係数のそれぞれが、各サンプルの時間的位置に基づいて決定されることを特徴とする請求項1に記載の装置。
- 前記連続する重み係数のそれぞれが、閾値との比較に基づいて決定されることを特徴とする請求項1に記載の装置。
- 前記連続する重み係数のそれぞれが、各サンプルの振幅に基づいて決定されることを特徴とする請求項2に記載の方法。
- 前記連続する重み係数のそれぞれが、各サンプルの時間的位置に基づいて決定されることを特徴とする請求項2に記載の方法。
- 前記連続する重み係数のそれぞれが、閾値との比較に基づいて決定されることを特徴とする請求項2に記載の方法。
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JP2011043026A Expired - Fee Related JP5466193B2 (ja) | 2000-08-29 | 2011-02-28 | 改良された空気流量平坦化検出機能を有する呼吸装置 |
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EP (1) | EP1313526B1 (ja) |
JP (3) | JP5099866B2 (ja) |
AU (2) | AU8370001A (ja) |
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AU8370001A (en) | 2002-03-13 |
US20180000427A1 (en) | 2018-01-04 |
JP2004506499A (ja) | 2004-03-04 |
JP5466193B2 (ja) | 2014-04-09 |
US8739789B2 (en) | 2014-06-03 |
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