JP5441707B2 - プレチスモグラフ変動プロセッサ - Google Patents
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- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
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Description
この出願は、2006年12月9日に提出されて「プレチスモグラフ変動指数」という発明の名称が付けられた先の米国仮特許出願である第60/873,663号出願と、2007年10月12日に提出されて「プレチスモグラフ変動指数」という発明の名称が付けられた先の米国仮特許出願である第60/998,782号出願について優先権を主張するものである。上記両出願のすべての内容は、参照によってこの明細書の中に組み込まれる。
図1は、プレチスモグラフ変動処理システム100の実施形態を示しており、この実施形態では、プレチスモグラフ変動(PV)の1つ以上の測定値が算出される。プレチスモグラフ変動処理システム100では、患者の状態の処置を表示するとともにそれに影響を及ぼすために、PVに応じて少なくともいくつかの表示、警告または制御がもたらされる利点がある。PV処理システム100によれば、SpO2、脈拍数(PR)、灌流指数(PI)、信号品質、および、複数波長構成においてHbCOやHbMetのような付加的血液パラメータ測定値がさらに生成される。
図2は、強度軸201対時間軸202に関してプロットされたプレチスモグラフ200を示している。このプレチスモグラフ200には複数のパルス210があり、それぞれのパルスは、山212と谷214を有し、また、時間周期216にわたって延びている。それぞれのパルス210について灌流指数(PI)値を定義することができる。
図3はPVIプロセス300の実施形態を示しており、この実施形態により、プレチスモグラフ変動指数(PVI)が導き出されるとともに表示される。初めに、第1バッファが、算出された灌流指数(PI)値で満たされる(310〜330)。ある実施形態では、これらの値は、先に説明されたように、IRチャネルに基づいている。第1バッファ335の中に充分な量の生理的許容データがあるときには、第2バッファが、算出されたプレチスモグラフ変動指数(PVI)値で満たされる(340〜360)。第2バッファにおける中央PVIが算出されて表示される(370〜380)。第1バッファにおける許容データの量が不充分であるときには、ディスプレイは最後に算出された中央PVIで凍結される(390)。
図4は、プロセスステップ401および初期設定402を有するプレチスモグラフ変動(PV)プロセッサ400の実施形態を示している。初期設定402によって、プロセスステップ401の具体的特性が決定される。PVプロセッサ400によって、1つ以上のプレチスモグラフチャネル405が入力され、PV出力値407が生成される。プレチスモグラフチャネル405のそれぞれは、脈動式酸素濃度計センサの赤色エミッタおよびIRエミッタに対応する赤色波長チャネルおよびIR波長チャネルのような異なる光センサ波長に対応している。先に引用した米国特許出願第11/367,013号に記載されたような複数波長センサが使用されるときには、3つ以上のチャネルがあってもよい。例えば、波長が約630nmから約905nmまで変化する8つのチャネルがあってもよい。ある実施形態では、PV算出において精度または堅牢性を増大させるために、2つ以上のプレチスモグラフチャネル405が、平行して、または複合プレチスモグラフとして処理される。入力装置410により、PV算出のためにどのプレチスモグラフチャネル405をプレチスモグラフ入力値414として使用するかが、選択されたチャネル初期設定412に従って決定される。入力装置410により、任意の1つのチャネル405またはいくつかのチャネル405の組み合わせを選択してよい。前処理415により、所定の式417に従ってプレチスモグラフ入力値414が修正される。ある実施形態では、プレチスモグラフベースラインにおけるあらゆる緩慢な変化すなわち低周波振動を排除するために、あるいは、プレチスモグラフ全体が吸気および呼気で上下へずらされる呼吸誘発変化のような平均値を排除するために、前処理415によりプレチスモグラフ入力値414がフィルタ処理される。ある実施形態では、前処理415は、毎分通過帯域ごとに30〜550ビートを有している帯域フィルタである。認識された許容パルス420が、先に引用した米国特許第7,044,918号に開示されたような生理的許容パルス424だけを通過させるためにパルス基準422へ適用される。
多くの臨床医は現在、患者生理機能の変化について脈動式酸素濃度計のプレチスモグラフ波形を観察している。残念なことに、脈動式酸素濃度計の製造業者間には、プレチスモグラフ波形を表示する方法に整合性がない。さらに、平滑化用、自動計数用および他の表示データ処理用のマスクは、生のプレチスモグラフ波形において変化する。このため、いくつかの患者生理機能は、ベッドサイドモニタのプレチスモグラフディスプレイの単なる観察からは容易に予測することができない。PVIのようなプレチスモグラフ変動(PV)パラメータは、必要に応じてある方向へ向けることもできる数値的フォーマットで表示されるプレチスモグラフ波形変化を有利に定量化する。従って、たとえわずかな生理的変化であっても確実に観察することが可能である。
Claims (5)
- 患者の状態を表示するプレチスモグラフ変動の測定値の決定方法であって、
ある組織部位の内部における拍動性血流に対応するパルスを有するプレチスモグラフ波形を受信するステップであって、前記波形が、前記組織部位による減衰の後の検出光を代表するものであるアナログ強度信号から変換されたディジタルデータを示しているステップと、
前記プレチスモグラフ波形における前記パルスに対応する複数の灌流値を導くステップであって、前記パルスについての山と谷を認識することと、これらの山と谷から前記パルスについてのAC値を算出することと、前記パルスについてのDC値を算出することと、前記AC値を前記DC値で正規化することと、を含む灌流値を導くステップと、
前記複数の灌流値を第1バッファの時間窓内に累積し、前記第1バッファのそれぞれについて1つの候補プレチスモグラフ変動指数値を算出することで、複数の候補プレチスモグラフ変動指数値を決定するステップであって、それぞれの前記候補が、前記灌流値の選択された群の変動性を示しており、それぞれの前記候補が、前記選択された群における最大灌流値と前記選択された群における最小灌流値との間の百分率差を代表しているステップと、
前記第1バッファから算出された候補プレチスモグラフ変動指数値を第2バッファの時間窓内に累積し、前記複数の候補プレチスモグラフ変動指数値を代表している出力プレチスモグラフ変動指数を算出するステップと、
算出された前記出力プレチスモグラフ変動指数をディスプレイに送るステップであって、複数のバッファ基準が満たされていないときには、バッファ基準が満たされるまで、最後に算出された前記出力プレチスモグラフ変動指数を表示するステップと、
を含む方法。 - 複数の候補プレチスモグラフ変動指数値を決定するステップは、
前記第1バッファの時間窓におけるそれぞれの内部における前記複数の灌流値を最大灌流値から最小灌流値まで並べ換えるステップと、
前記第1バッファの時間窓におけるそれぞれのうち、一連の最大灌流値から少なくとも1つの灌流値と一連の最小灌流値から少なくとも1つの灌流値とを削除するステップと、
をさらに含む請求項1に記載のプレチスモグラフ変動方法。 - 出力プレチスモグラフ変動指数を算出するステップは、候補プレチスモグラフ変動指数値の中央値を算出するステップを含む請求項1又は2に記載のプレチスモグラフ変動方法。
- 前記パルスのうち生理的に許容することのできるパルスを認識するステップと、
前記バッファのそれぞれについての許容可能なデータの最小時間量を決定するステップと、
をさらに含む請求項1〜3の何れか1項に記載のプレチスモグラフ変動方法。 - 入力するステップは、前記プレチスモグラフ波形のためにIRチャネルを使用するステップを含み、
認識するステップは、許容パルスを検証するために赤色チャネルを使用するステップを含む請求項4に記載のプレチスモグラフ変動方法。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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US87366306P | 2006-12-09 | 2006-12-09 | |
US60/873,663 | 2006-12-09 | ||
US99878207P | 2007-10-12 | 2007-10-12 | |
US60/998,782 | 2007-10-12 | ||
PCT/US2007/086879 WO2008073855A2 (en) | 2006-12-09 | 2007-12-07 | Plethysmograph variability processor |
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JP2010512192A JP2010512192A (ja) | 2010-04-22 |
JP5441707B2 true JP5441707B2 (ja) | 2014-03-12 |
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US (4) | US8414499B2 (ja) |
EP (1) | EP2096994B1 (ja) |
JP (1) | JP5441707B2 (ja) |
WO (1) | WO2008073855A2 (ja) |
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US10092200B2 (en) | 2018-10-09 |
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US20220240801A1 (en) | 2022-08-04 |
US20190082979A1 (en) | 2019-03-21 |
US11229374B2 (en) | 2022-01-25 |
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