JP2014530049A - フォトプレチスモグラフから呼吸情報を決定するためのシステムおよび方法 - Google Patents
フォトプレチスモグラフから呼吸情報を決定するためのシステムおよび方法 Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
- A61B5/0816—Measuring devices for examining respiratory frequency
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6813—Specially adapted to be attached to a specific body part
- A61B5/6825—Hand
- A61B5/6826—Finger
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/7239—Details of waveform analysis using differentiation including higher order derivatives
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
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Abstract
Description
I(λ,t)=I0(λ)exp(−(sβ0(λ)+(1−s)βr(λ))l(t)) (1)
ここで、
λ=波長、
t=時間、
I=検出された光の強度、
I0=透過された光の強度、
S=酸素飽和度、
β0、βr=実験的に得られた吸収係数、および
l(t)=時間の関数としての濃度とエミッタから検出器までの経路長との合成である。
1.IRおよび赤色に対して式(1)の自然対数が取られ(自然対数を表すために「log」が使用される)、次式を得る。
logI=logI0−(sβ0+(1−s)βr)l (2)
2.次いで、式(2)が時間で微分され、次式を得る。
x=[I(t2,λIR)−I(tj,λIR)]I(t1,λR) (12)、
および
y=[I(t2,λR)−I(t1,λR)]I(t1,λIR)(13)
である。
たとえば上記で説明された技法を使用してRが決定または推定されると、血液酸素飽和度は、血液酸素飽和度値をRに関連づける任意の適切な技法を使用して決定または推定されることができる。たとえば、血液酸素飽和度は、Rの値でインデックスを付けられてもよい、実験によって得られるデータから決定されることができる、ならびに/または曲線フィティングおよび/もしくは他の補間技法から決定されてもよい。
重心(x)=Σ(xi*yi)/Σyi
重心(y)=Σ(xi*yi)/Σxi
amp(i)=i番目の脈拍中の最大サンプル−i番目の脈拍中の最小サンプル
ampDiff(i)=|amp(i+1)−amp(i)|
perDiff(i)=|周期(i)−周期(i+1)|
FilteredSeq=wt*NewSeq+(1−wt)*PrevSeq
ここで、
FilteredSeq=フィルタリングされた自己相関シーケンス、
wt=フィルタの重み、
NewSeq=自己相関シーケンス、
PrevSeq=フィルタリングされた先行する自己相関シーケンス
である。
SequenceAge=wt*CurrentAge+(1−wt)*PrevAge
ここで、
SequenceAge=フィルタリングされた自己相関シーケンスエイジ、
wt=フィルタの重み、
CurrentAge=自己相関シーケンスエイジ、
PrevAge=フィルタリングされた先行する自己相関シーケンスエイジ
である。
wnew=(AX+r)12
ここで、
AX=自己相関測定基準、
r=ピアソン相関係数
である。
wC=(b*wnew+(1−b)*wCprev)*tRatio
ここで、
wC=合成重み、
wnew=現在のシーケンスの重み、
wCpewv=先行するシーケンスの重み、
b=0.01*tRatio、および
tRatio=時間比
である。
wC−D=ダウン測定基準シーケンスに対する合成重み、
wC−K=尖度シーケンスに対する合成重み、
wC−DSD=DSDシーケンスに対する合成重み、
SD=フィルタリングされたダウンシーケンス、
SK=フィルタリングされた尖度シーケンス、および
SDSD=フィルタリングされたDSDシーケンス
である。
wC−D=ダウン測定基準シーケンスに対する合成重み、
wC−K=尖度シーケンスに対する合成重み、
wC−DSD=DSDシーケンスに対する合成重み、
AgeD=ダウンシーケンスのエイジ、
AgeK=尖度シーケンスのエイジ、および
AgeDSD=DSDシーケンスのエイジ
である。
x=[x(0),x(1),x(2),…,x(N−1)]
x=[x(N−m),x(N−m+1),…,x(N−1),x(0),x(1),……,x(N−1),x(0),x(1),…,x(m−1)]
パディングされた信号に対して得られた信号長Lは、2*m+Nである。動的スケーリングが、ウェーブレット長に基づきm項を修正してもよい。代表的一実施形態では、パディング長は、ウェーブレット長の50%に等しくてもよい。パディング長とウェーブレット長の間の他の関係が選択されてもよいことが理解されよう。
Rfilt=Rwt*Rnew+(1−Rwt)*R’filt
ここで、
Rfilt=フィルタリングされた呼吸情報、
Rwt=合成自己相関測定基準、
Rnew=計算された呼吸情報、および
R’filt=フィルタリングされた先行する呼吸情報
である。
Rage=Rwt*CombinedAge+(1−Rwt)*R’age
ここで、
Rage=フィルタリングされた呼吸エイジ、
Rwt=合成自己相関測定基準
CombinedAge=合成自己相関シーケンスのエイジ、
R’filt=フィルタリングされた先行する呼吸エイジ
である。
w(k)=w(k)20
ここで、
Pvar=周期変動性、
Avar=振幅変動性、および
k=最新の解析窓から最も古い解析窓まで昇順に総計Nの解析窓からなる解析窓
である。
Claims (20)
- 生理学的信号から生理学的情報を決定する方法であって、
生理学的信号上に参照点を決定するステップと、
参照点に少なくとも部分的に基づき、かつ参照点に対する時間間隔に少なくとも部分的に基づき、生理学的信号上の基準点を決定するステップと、
基準点に少なくとも部分的に基づき生理学的情報を計算するステップと
を備える方法。 - 生理学的信号が連続するサンプルを備え、時間間隔は特定のサンプル数を備える、請求項1に記載の方法。
- 生理学的信号がフォトプレチスモグラフ(photoplethysmograph)信号であり、時間間隔は約210ミリ秒であり、特定のサンプル数は約16サンプルである、請求項2に記載の方法。
- 時間間隔が所定の値である、請求項1に記載の方法。
- 生理学的情報が呼吸数を備える、請求項1に記載の方法。
- 決定された基準点に少なくとも部分的に基づき基準信号を作成するステップをさらに備える、請求項1に記載の方法。
- 生理学的信号の参照点が、ゼロ点、一次微分最大、一次微分ゼロ点、一次微分最小、二次微分最大、二次微分最小、二次微分ゼロ点、およびこれらの任意の組合せからなる群から選択されたタイプからなる、請求項1に記載の方法。
- 参照点を決定するステップが、生理学的信号上に複数の参照点を決定するステップをさらに備え、生理学的信号上に基準点を決定するステップは、複数の参照点のうち少なくとも1つの参照点にそれぞれ対応する複数の基準点を決定するステップをさらに備える、請求項1に記載の方法。
- 生理学的信号が、複数の脈波を備えるフォトプレチスモグラフ信号であり、複数の参照点のうちの各参照点が、複数の脈波のうちの単一脈波に対応する、請求項8に記載の方法。
- フォトプレチスモグラフ信号またはそこから得られる信号から得られる、サンプリングされた信号から、呼吸情報を決定する方法であって、サンプリングされた信号は複数の連続する脈波を備え、方法は、
サンプリングされた信号の2つの連続する脈波に対応する2つの連続する参照点を探し出すステップと、
2つの連続する参照点の間で、サンプリングされた信号の最大値を探し出すステップと、
探し出された最大値の前または後の特定のサンプル数に位置する基準点を選択するステップと、
選択された基準点に少なくとも部分的に基づき呼吸情報を決定するステップと
を備える方法。 - 選択された基準点を備える基準信号を作成するステップをさらに備え、呼吸数を決定するステップは、さらに基準信号に少なくとも部分的に基づく、請求項10に記載の方法。
- 特定のサンプル数が固定される、請求項10に記載の方法。
- 特定のサンプル数が、2つの連続する参照点の最前方の参照点後の約16サンプルに固定され、16サンプルは、時間間隔約210ミリ秒に対応する、請求項12に記載の方法。
- 特定のサンプル数が脈拍周期に少なくとも部分的に基づく、請求項10に記載の方法。
- 特定のサンプル数が脈拍周期の10%の時間間隔に対応する、請求項14に記載の方法。
- 患者モニタリングシステムであって、
患者の生理学的信号を受信するように構成されたセンサインタフェースと、
生理学的信号をサンプリングし、
サンプリングされた生理学的信号上に参照点を決定し、
参照点に少なくとも部分的に基づき、かつ参照点に対する時間間隔に少なくとも部分的に基づき、サンプリングされた生理学的信号上の基準点を決定し、かつ
基準点に少なくとも部分的に基づき生理学的情報を計算する
ように構成された処理装置と
を備えるシステム。 - 処理装置に結合されたメモリをさらに備え、メモリは、時間間隔を備える基準情報を格納するように構成され、処理装置は基準情報にアクセスするようにさらに構成される、請求項16に記載のシステム。
- センサインタフェースが、複数の脈波を備えるフォトプレチスモグラフ信号を受信するように構成され、処理装置は、サンプリングされた生理学的信号の2つの連続する脈波に対応する2つの連続する参照点を決定するようにさらに構成される、請求項16に記載のシステム。
- 処理装置が、2つの連続する参照点間で、サンプリングされた信号の最大値を探し出すようにさらに構成され、処理装置は、探し出された最大値の前または後の特定のサンプル数に位置する基準点を選択するようにさらに構成される、請求項18に記載のシステム。
- 処理装置が、選択された基準点に少なくとも部分的に基づき呼吸数を計算するようにさらに構成される、請求項19に記載のシステム。
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US13/243,907 US9693709B2 (en) | 2011-09-23 | 2011-09-23 | Systems and methods for determining respiration information from a photoplethysmograph |
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