JP6066533B2 - インピーダンス指紋を用いた患者姿勢決定及び埋込可能刺激器デバイス内の刺激プログラム調節 - Google Patents
インピーダンス指紋を用いた患者姿勢決定及び埋込可能刺激器デバイス内の刺激プログラム調節 Download PDFInfo
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- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0538—Measuring electrical impedance or conductance of a portion of the body invasively, e.g. using a catheter
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
- A61B5/1116—Determining posture transitions
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- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
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- A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
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Description
この国際出願は、共に引用によって本明細書に組み込まれている2013年9月11日出願の米国特許出願第14/024,276号及び2012年12月7日出願の米国特許仮出願第61/734,629号に対する優先権を主張するものである。
Z=V/I=|V|/|I|*e-jθ=|Z|*e-jθ
ここで、インピーダンスのマグニチュード|Z|は、電圧のマグニチュードと電流の電圧の間の比を含む(すなわち、|Z|=|V|/|I|)。与えられた周波数で、このインピーダンス130のマグニチュード|Z|及び位相θは、インピーダンスアルゴリズム120によって格納される。そのような格納は、マイクロコントローラ110内のメモリ内か、又はマイクロコントローラに関連付けられ、それによって制御される別個のメモリ内のものとすることができる。好ましい実施形態において、電極Eにおけるインピーダンス測定130を他の周波数で繰り返すことができ、それによって更に以下に解説するように、新しいマグニチュード|Z|及び位相θを決定して格納することが可能になる。
|Z|int*e-jθint=R2+(R1/(1+R1*Cj2πfint))
この式をCに対して解くことができる。しかし、キャパシタンスに関する簡単な仮定を行うことによってR1及びR2を決定するこの簡単な方法は、厳密に必要というわけではない。R1、R2、及びCを(|Z|1,θ1,f1)、(|Z|2,θ2,f2)、及び(|Z|3,θ3,f3)から解くことが可能な連立方程式を与える上で、あらゆる3つの周波数での測定値を使用することができる。
|Z|*e-jθ=(2/Cdej2πf)+R2+(R1/(1+R1*Cj2πf))
ここで、(2/Cdej2πf)は、2つの減結合コンデンサ103の直列インピーダンスを含む。減結合コンデンサのキャパシタンスCdeは既知であるので、これらのキャパシタンスは、3つの異なる周波数で測定を行うことによってR1、R2、及びCという未知組織値を見つける機能に影響を及ぼすことにはならない。(しかし、インピーダンス測定に減結合コンデンサ103を含めることは、図7に示すような高周波数及び低周波数でのR1及びR2の簡単な近似を可能にしないことに注意されたい。)
102 組織モデル
C コンデンサー
E 単一電極
R1 レジスタ
Claims (11)
- 埋込可能刺激器デバイスであって、
電気刺激を患者に供給するように構成された複数の電極と、
複数の異なる周波数で前記電極の複数の組合せの間のインピーダンスを決定し、かつ該決定されたインピーダンスから測定インピーダンス指紋を決定するように構成されたインピーダンスアルゴリズムと、を含み、
前記インピーダンスアルゴリズムは、前記測定インピーダンス指紋に従って前記電極に供給される刺激プログラムを選択するように更に構成される、
ことを特徴とするデバイス。 - 前記決定されたインピーダンスは、複素インピーダンスであることを特徴とする請求項1に記載のデバイス。
- 複数の予め決められたインピーダンス指紋と複数の関連付けられた刺激プログラムとを格納するように構成されたデータベースを更に含み、
前記測定インピーダンス指紋は、前記刺激プログラムを選択するために予め決められたインピーダンス指紋と比較される、
ことを特徴とする請求項1に記載のデバイス。 - 前記複数の予め決められたインピーダンス指紋は、適合化手順中に前記データベースに格納されることを特徴とする請求項3に記載のデバイス。
- 前記複数の予め決められたインピーダンス指紋は、電気刺激が前記患者に与えられる時に学習されることを特徴とする請求項3に記載のデバイス。
- 選択される前記刺激プログラムは、どの電極がアクティブか、該アクティブ電極の極性、該アクティブ電極での前記電気刺激のマグニチュード、電気刺激の持続時間、及び該電気刺激の周波数を含む1つ又はそれよりも多くの刺激パラメータを含むことを特徴とする請求項1に記載のデバイス。
- 前記インピーダンスアルゴリズムは、前記電極の前記複数の組合せの間の前記インピーダンスを決定するために、該電極の該複数の組合せに測定信号を供給し、かつ該測定信号に対する応答を評価することを特徴とする請求項1に記載のデバイス。
- 前記測定信号はAC電流を含み、前記応答は前記電極の前記複数の組合せの間のAC電圧を含むことを特徴とする請求項7に記載のデバイス。
- 前記測定信号は、電気刺激が発生していない無信号期間中に発生することを特徴とする請求項7に記載のデバイス。
- 前記測定インピーダンス指紋は、前記電極の前記複数の組合せの間の組織モデル内の電気成分の値を含むことを特徴とする請求項1に記載のデバイス。
- 前記測定インピーダンス指紋は、前記患者の姿勢を示すことを特徴とする請求項1に記載のデバイス。
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US201261734629P | 2012-12-07 | 2012-12-07 | |
US61/734,629 | 2012-12-07 | ||
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US14/024,276 US9446243B2 (en) | 2012-12-07 | 2013-09-11 | Patient posture determination and stimulation program adjustment in an implantable stimulator device using impedance fingerprinting |
PCT/US2013/060160 WO2014088674A2 (en) | 2012-12-07 | 2013-09-17 | Patient posture determination and stimulation program adjustment in an implantable stimulator device using impedance fingerprinting |
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JP2016503333A JP2016503333A (ja) | 2016-02-04 |
JP6066533B2 true JP6066533B2 (ja) | 2017-01-25 |
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EP (1) | EP2928366B1 (ja) |
JP (1) | JP6066533B2 (ja) |
CN (1) | CN104968260B (ja) |
AU (1) | AU2013356596B2 (ja) |
WO (1) | WO2014088674A2 (ja) |
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