JP2008506422A - 誘発神経応答閾値の自動決定 - Google Patents
誘発神経応答閾値の自動決定 Download PDFInfo
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Abstract
【解決手段】誘発された神経応答を自動的に分析すること。この方法は、典型的な閾値NRTレベルに可能な限り近い初期電流レベルから始まり徐々に大きくなる電流レベルで電気刺激を対象神経領域に加えるステップと、刺激に応答して対象神経領域により生成された聴覚信号のNRT測定値を記録するステップと、聴覚信号から抽出された複数の特性に基づいてNRT測定が神経応答を含むかどうかを予測するために、機械学習エキスパート・システムを利用するステップとを含む。
【選択図】図3
Description
加えられるまで行われる。そのような実施形態では、第1のそのような神経応答を誘発した刺激電流レベルは、第1の最低刺激閾値と定義される。そのような実施形態では、加えられた刺激の電流レベルは第1の最低刺激閾値から徐々に低減されることが好ましい。そしてその低減は、2つの連続する刺激が神経応答を誘発しなかったエキスパート・システムによる評価を導くような刺激を加えられるまで行われる。神経応答を誘発しなかったそれら刺激電流レベルの高い方のレベルは、第2の最低刺激閾値と定義されることが好ましい。このような実施形態が図4Bに示されている。図4Bでは、次第に低減する際にとられたNRT測定値が神経応答を有するかどうかを判定するために、第2のエキスパート・システムが実施される。1つの好ましい実施形態では、誤ったポジティブの事象の発生を最低限に抑えるように構成することができる第1のエキスパート・システムと比較して、第2のエキスパート・システムは、全体的なエラー率を最低限に抑えるように構成される。
・現在のNRT測定値と前回のNRT測定値のどちらも神経応答とみなされない場合は、6電流レベル単位である(ブロック582、584および586)。
・現在のNRT測定値が神経応答とみなされず、一方で前回の測定値がそうでないと予測された場合は、4電流レベル単位である(ブロック582、586、588)。
・現在のNRT測定値が神経応答とみなされた場合、2電流レベル単位である(ブロック582、590)。
N1は、最初の8つのサンプルの最低値である。
P1は、サンプル16以下の、N1以後のサンプルの最大値である。
N1−P1(μV)=ECAPP1−ECAPN1
以下の規則のいずれかが真ならば、N1−P1=0である。
N1−P1<0
N1とP1の間の待ち時間<2サンプル
N1とP1の間の待ち時間<12サンプル
N1とN1以後の最大サンプルの間の待ち時間>15サンプルおよびN1−P1対範囲N1オンワードの比率<0.85
雑音=サンプル17から32の範囲(最大値−最小値)
N1P1/雑音=N1−P1(振幅)÷雑音(雑音レベル)
Claims (15)
- 典型的な閾値NRTレベルに可能な限り近い初期電流レベルから始まり徐々に大きくなる電流レベルで電気刺激を対象神経領域に適用するステップと、
前記刺激に応答して前記対象神経領域により生成された聴覚信号のNRT測定値を記録するステップと、
前記聴覚信号から抽出された複数の特性に基づいて前記NRT測定値が神経応答を含むかどうかを予測するために、機械学習エキスパート・システムを利用するステップと
を含む誘発された神経応答を自動的に分析する方法。 - 前記閾値NRTを特定するために必要な測定値の量を最低限に抑えながら、安全性を保証するように前記初期電流レベルを選択するステップをさらに含む請求項1に記載の方法。
- 前記初期電流レベルを選択するステップは、
術中適用では、神経応答が誘発されることが予期されない電流レベルを、初期電流レベルとして選択するステップを
含む請求項2に記載の方法。 - 前記初期電流レベルを選択するステップは、
前記典型的なT−NRTよりかなり低い初期電流レベルを選択するステップを
含む請求項3に記載の方法。 - 前記初期電流レベルを選択するステップは、
術中適用では、前記典型的なT−NRTより高いかまたは低い初期電流レベルを選択するステップを含む請求項3に記載の方法。 - 前記機械学習エキスパート・システムが、前記NRT測定値が神経応答を含まないことを予測した場合、
前記電気刺激の前記電流レベルを増分するステップと、
前記適用するステップと、前記記録するステップと、前記利用するステップとを反復するステップと、
神経応答が誘発されるまで前記増分するステップと前記反復するステップとを反復するステップと
をさらに含む請求項1に記載の方法。 - 前記T−NRTを、より細かい刺激分解能で局所的に確立するステップと
をさらに含む請求項1に記載の方法。 - 外部デバイスと通信するように構成された蝸牛インプラントと、
前記蝸牛インプラントの電極による蝸牛の電気刺激に応答して前記蝸牛内の神経活動の神経応答遠隔測定(NRT)の測定値を記録するように構成された、前記蝸牛インプラントに通信可能に連結された自動神経応答測定システムであって、神経応答を誘発するために加えられた刺激の初期電流レベルは、神経応答を発生させる典型的な閾値電流レベルに可能な限り近いレベルに設定されており、複数の前記抽出された特性に基づいて前記NRT測定値が神経応答を含むかどうかを判定するように構成されたエキスパート・システムを含む自動神経応答測定システムと
を含む蝸牛インプラント・システム。 - 神経刺激を加えるステップと、
前記神経刺激に対する神経応答の測定値を取得するステップと、
前記測定値にエキスパート・システムを適用することにより、神経応答が誘発されたかどうかを評価するステップであって、前記エキスパート・システムは前記神経応答から抽出された複数の特性を考慮するステップと
を含む神経応答が誘発される最低刺激閾値を特定する方法。 - 前記測定値の最高最低振幅に関するパラメータと、
前記測定値の前記雑音に関するパラメータと、
前記測定値の前記雑音に対する前記測定値の前記最高最低振幅の前記比率に関するパラメータと、
事前定義され、予期された神経応答に対する前記測定値の前記相関関係に関するパラメータと、
神経応答+刺激アーチファクトを含む、事前定義され、予期されたトレースに対する前記測定値の前記相関関係に関するパラメータと、
刺激アーチファクトのみを含む、事前定義され、予期されたトレースに対する前記測定値の前記相関関係に関するパラメータと、
類似のレベルの神経刺激を伴う前回の測定値に対する前記測定値の前記相関関係に関するパラメータと、
刺激電流レベルに関するパラメータと
の1つまたは複数を含む少なくとも1つの決定ツリーの帰納法などの機械学習アルゴリズムを含むエキスパート・システム。 - 典型的な閾値NRTレベルに可能な限り近い初期電流レベルから始まり徐々に大きくなる電流レベルで電気刺激を対象神経領域に加えるための手段と、
前記刺激に応答して前記対象神経領域により生成された聴覚信号のNRT測定値を記録するための手段と、
前記聴覚信号から抽出された複数の特性に基づいて前記NRT測定値が神経応答を含むかどうかを予測するための手段と
を含む誘発された神経応答自動分析システム。 - 前記閾値NRTを特定するために必要な測定値の量を最低限に抑えながら、安全性を保証するように前記初期電流レベルを選択するための手段をさらに含む請求項11に記載のシステム。
- 前記初期電流レベルを選択するための前記手段は、
術中適用では、神経応答が誘発されることが予期されない電流レベルを、初期電流レベルとして選択する請求項12に記載のシステム。 - 前記初期電流レベルを選択するための前記手段は、
前記典型的なT−NRTよりかなり低い初期電流レベルを選択する請求項13に記載のシステム。 - 前記初期電流レベルを選択するための前記手段は、術中適用では、前記典型的なT−NRTより高いかまたは低い初期電流レベルを選択する請求項13に記載のシステム。
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AU2004903254 | 2004-06-15 | ||
AU2004903254A AU2004903254A0 (en) | 2004-06-15 | Method and system for measurement of neural response | |
PCT/US2005/021207 WO2005122887A2 (en) | 2004-06-15 | 2005-06-15 | Automatic determination of the threshold of an evoked neural response |
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EP (1) | EP1765459B1 (ja) |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8019432B2 (en) | 2005-10-31 | 2011-09-13 | Cochlear Limited | Provision of stimulus components having variable perceptability to stimulating device recipient |
US8190268B2 (en) | 2004-06-15 | 2012-05-29 | Cochlear Limited | Automatic measurement of an evoked neural response concurrent with an indication of a psychophysics reaction |
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WO2016006688A1 (ja) * | 2014-07-10 | 2016-01-14 | Cyberdyne株式会社 | 生体信号計測装置、生体信号計測方法、装着式動作補助装置、及び動作補助方法 |
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Cited By (7)
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US8190268B2 (en) | 2004-06-15 | 2012-05-29 | Cochlear Limited | Automatic measurement of an evoked neural response concurrent with an indication of a psychophysics reaction |
US8965520B2 (en) | 2004-06-15 | 2015-02-24 | Cochlear Limited | Automatic determination of the threshold of an evoked neural response |
US9744356B2 (en) | 2004-06-15 | 2017-08-29 | Cochlear Limited | Automatic determination of the threshold of an evoked neural response |
US10449357B2 (en) | 2004-06-15 | 2019-10-22 | Cochlear Limited | Automatic determination of the threshold of an evoked neural response |
US8019432B2 (en) | 2005-10-31 | 2011-09-13 | Cochlear Limited | Provision of stimulus components having variable perceptability to stimulating device recipient |
WO2016006688A1 (ja) * | 2014-07-10 | 2016-01-14 | Cyberdyne株式会社 | 生体信号計測装置、生体信号計測方法、装着式動作補助装置、及び動作補助方法 |
JP7466537B2 (ja) | 2018-11-02 | 2024-04-12 | サルーダ・メディカル・ピーティーワイ・リミテッド | 電気神経刺激療法の治療効果を評価するためのシステム及び非一時的コンピュータ可読媒体 |
Also Published As
Publication number | Publication date |
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US9744356B2 (en) | 2017-08-29 |
EP1765459A2 (en) | 2007-03-28 |
US20170296130A1 (en) | 2017-10-19 |
WO2005122887A2 (en) | 2005-12-29 |
US8965520B2 (en) | 2015-02-24 |
JP5548336B2 (ja) | 2014-07-16 |
CA2569724A1 (en) | 2005-12-29 |
EP1765459B1 (en) | 2018-11-28 |
US20150126897A1 (en) | 2015-05-07 |
EP1765459A4 (en) | 2010-06-09 |
US20080319508A1 (en) | 2008-12-25 |
WO2005122887A3 (en) | 2006-05-04 |
US10449357B2 (en) | 2019-10-22 |
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