JP5031285B2 - ハイブリッドの磁気およびインピーダンスに基く位置検出システム - Google Patents
ハイブリッドの磁気およびインピーダンスに基く位置検出システム Download PDFInfo
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Description
本発明は、一般に、生体内に置かれた物体の位置を検出することに関連しており、特に、インピーダンスに基く位置センサーのための正確な基準を設けることに関連している。
センサー、管、カテーテル、分配装置、および移植片等のような、体内の物体の位置を追跡することは、多くの医療処置において必要とされている。このような体内の物体の位置を決めるための、十分に確立された高精度なシステムが、磁場の検出に基いて、開発されている。これらのシステムは、外部において発生された磁場の相対的な強度を測定して、これらの測定値から体内の物体の位置を導出するために、その物体に固定されているセンサーを利用している。このような磁気に基く位置検出のための方法は、例えば、ベン−ハイム(Ben-Haim)に発行されている米国特許第5,391,199号、同5,443,489号および同6,788,967号、ベン−ハイム(Ben-Haim)他に発行されている米国特許第6,690,963号、アッカー(Acker)他に発行されている米国特許第5,558,091号、アッシェ(Ashe)に発行されている米国特許第6,172,499号、およびゴバリ(Govari)に発行されている米国特許第6,177,792号、において開示されており、これらの開示の全ては参照により本明細書に組み入れられている。
本発明の実施形態はハイブリッドの位置検出のシステムおよび方法を提供しており、これらのシステムおよび方法は、磁気的および電気的な位置検出技法を組み合わせている。これらのシステムにおいて、磁気位置センサーは、正確さに劣る電気的なインピーダンスに基く測定値を較正するための、正確な位置基準、を与える。この目的のために、磁気位置センサーと1個以上の電極とを備えている、カテーテル等のような、ハイブリッド・プローブが、磁気の位置測定値をインピーダンスに基く測定値に関連づけるために、用いられている。この種のシステムは、多数の磁気位置センサーの必要性を軽減し、したがって、高精度の磁気位置検出と低コストのインピーダンスに基く検出との両方から恩恵を受ける。
磁場トランスデューサと少なくとも1個のプローブ電極とを含む、プローブを、被験者の体腔の中に、導入する処理と、
上記の磁場トランスデューサを用いて、上記の体内腔の中のある場所における上記プローブの位置座標を測定する処理と、
上記の少なくとも1個のプローブ電極と上記被験者の体表面上の1個以上の箇所との間のインピーダンスを測定する処理と、
上記の測定された位置座標を用いて、上記の測定されたインピーダンスを較正する処理と、を含む、方法が提供されている。
少なくとも1個の第2のプローブ電極を含む第2のプローブを、上記の体腔の中に導入する処理と、
上記の少なくとも1個の第2のプローブ電極と体表面上の1個以上の箇所との間のインピーダンスを測定する処理と、
上記の較正マップを用いて上記の第2のプローブ電極に関して測定したインピーダンスを較正することにより、上記の第2のプローブの第2の位置座標を決定する処理と、を含む。
磁場トランスデューサと少なくとも1個のプローブ電極とを有していて、被験者の体腔の中に導入されることに適合している、プローブと、
上記の磁場トランスデューサを用いて上記のプローブの位置座標を測定し、上記の少なくとも1個のプローブ電極と上記被験者の体表面上の1個以上の箇所との間のインピーダンスを測定し、さらに、測定した位置座標を用いて測定したインピーダンスを較正するように、構成されている制御装置と、を備えている、位置検出システム、も提供されている。
図1は、本発明の実施形態による、磁場位置センサー22と、多数のカテーテル電極30,32および34と、を備えている、ハイブリッド・カテーテル20、の遠位側端部を示している概略的な詳細図である。
(1)位置検出のための方法において、
被験者の体腔の中に、磁場トランスデューサおよび少なくとも1個のプローブ電極を含むプローブ、を導入する処理と、
前記磁場トランスデューサを用いて、前記体腔の中の場所における前記プローブの位置座標を測定する処理と、
前記少なくとも1個のプローブ電極と前記被験者の体表面上の1個以上の箇所との間のインピーダンスを測定する処理と、
前記測定した位置座標を用いて、前記測定したインピーダンスを較正する処理と、
を含む、方法。
(2)実施態様1に記載の方法において、
前記磁場トランスデューサは1個以上のコイルを含む、方法。
(3)実施態様1に記載の方法において、
前記プローブの位置座標を測定する処理は、外部磁場を生成する処理と、前記外部磁場により前記磁場トランスデューサの中に誘発される信号を測定する処理と、を含む、方法。
(4)実施態様1に記載の方法において、
前記位置座標を測定する処理は、前記磁場トランスデューサに磁場を生成させる処理と、前記磁場により外部磁場センサーの中に誘発される信号を測定する処理と、を含む、方法。
(5)実施態様1に記載の方法において、
前記インピーダンスを測定する処理は、前記少なくとも1個のプローブ電極と1個以上の体表面電極との間において、前記体を通して電流を流す処理と、前記電流に応じて前記インピーダンスを測定する処理と、を含む、方法。
前記体を通して電流を流す処理は、前記少なくとも1個のプローブ電極と前記1個以上の体表面電極との間に一定の電圧を維持する処理を含み、
前記インピーダンスを測定する処理は、前記一定の電圧において、前記電流を測定する処理を含む、
方法。
(7)実施態様5に記載の方法において、
前記体を通して電流を流す処理は、前記少なくとも1個のプローブ電極と前記1個以上の体表面電極との間に一定の電流を維持する処理を含み、
前記インピーダンスを測定する処理は、前記少なくとも1個のプローブ電極と前記1個以上の体表面電極との間の電圧を測定する処理を含む、
方法。
(8)実施態様1に記載の方法において、
前記インピーダンスを測定する処理は、少なくとも一対の体表面電極を横切って電圧を供給する処理と、前記少なくとも1個のプローブ電極における電圧降下を測定する処理と、を含む、方法。
(9)実施態様1に記載の方法において、
前記位置座標を測定する処理は、前記体腔の中の複数の位置において、前記磁場トランスデューサを用いて、前記位置座標を決定する処理を含み、
前記インピーダンスを測定する処理は、前記複数の位置においてインピーダンスを決定する処理を含み、
前記測定したインピーダンスを較正する処理は、前記複数の位置において決定された位置座標とインピーダンスとを用いて較正マップを生成する処理を含む、
方法。
(10)実施態様9に記載の方法において、
前記較正マップを生成するために用いられるプローブは、第1のプローブであり、
少なくとも1個の第2のプローブ電極を含む第2のプローブを、前記体腔の中に導入する処理と、
前記少なくとも1個の第2のプローブ電極と体表面上の1個以上の箇所との間のインピーダンスを測定する処理と、
前記第2のプローブ電極に関して測定したインピーダンスを、前記較正マップを用いて較正することにより、前記第2のプローブの第2の位置座標を決定する処理と、
をさらに含む、方法。
前記プローブは、前記磁場トランスデューサが配置されている基部と、前記少なくとも1個のプローブ電極が配置されている変形可能な部分と、を含み、前記変形可能な部分は、変形されていない時に、既知の形状を有しており、
前記測定したインピーダンスを較正する処理は、前記基部に対する前記変形可能な部分の偏向を決定する処理を含む、
方法。
(12)実施態様11に記載の方法において、
前記変位を決定する処理は、前記変形可能な部分が変形されていない時に、第1のインピーダンスを測定する処理と、前記変形可能な部分が偏向している時に、第2のインピーダンスを測定する処理と、前記偏向を決定するために、前記第2のインピーダンスを前記第1のインピーダンスに対して比較する処理と、を含む、方法。
(13)位置検出システムにおいて、
プローブであって、磁場トランスデューサと少なくとも1個のプローブ電極とを具備し、被験者の体腔の中に導入されるように構成されている、プローブと、
制御装置であって、前記磁場トランスデューサを用いて前記プローブの位置座標を測定し、前記少なくとも1個のプローブ電極と前記被験者の体表面上の1個以上の箇所との間のインピーダンスを測定し、さらに、測定した位置座標を用いて測定したインピーダンスを較正するように、構成されている、制御装置と、
を備えている、位置検出システム。
(14)実施態様13に記載のシステムにおいて、
前記外部磁場トランスデューサは、1個以上のコイルを含む、システム。
(15)実施態様13に記載のシステムにおいて、
外部磁場を発生するように構成されている外部磁場発生装置を備えており、前記外部磁場は前記磁場トランスデューサに位置信号を発生させ、
前記制御装置は、前記位置信号を受信して処理することにより、前記プローブの位置座標を測定するように構成されている、
システム。
前記磁場トランスデューサは、磁場を発生するように構成されており、
前記システムは、前記磁場に応じて、位置信号を発生するように構成された外部磁場センサーをさらに備えており、
前記制御装置は、前記位置信号を受信して処理することにより、前記プローブの位置座標を測定するように構成されている、
システム。
(17)実施態様13に記載のシステムにおいて、
前記制御装置は、前記少なくとも1個のプローブ電極と前記1個以上の箇所における体表面電極との間に電流を流し、前記電流に応じて、前記インピーダンスを測定するように、構成されている、システム。
(18)実施態様17に記載のシステムにおいて、
前記制御装置は、前記少なくとも1個のプローブ電極と前記体表面電極との間に、一定の電圧を維持し、前記一定の電圧において前記電流を測定するように、構成されている、システム。
(19)実施態様17に記載のシステムにおいて、
前記制御装置は、前記少なくとも1個のプローブ電極と前記体表面電極との間に、電流を維持し、前記少なくとも1個のプローブ電極と体表面電極との間の電圧を測定するように、構成されている、システム。
(20)実施態様13に記載のシステムにおいて、
前記制御装置は、前記1個以上の箇所における少なくとも一対の体表面電極を横切って電圧を供給し、前記少なくとも1個のプローブ電極における電圧降下を検出することにより前記インピーダンスを測定するように、構成されている、システム。
前記制御装置は、前記体腔の中の複数の場所において、前記磁場トランスデューサを用いて、位置座標を決定し、前記複数の場所における前記インピーダンスを決定し、さらに、前記複数の場所における前記インピーダンスを決定する較正マップを生成するように、構成されている、システム。
(22)実施態様21に記載のシステムにおいて、
前記較正マップを生成するために用いられるプローブは、第1のプローブであり、
前記システムは、少なくとも1個の第2のプローブ電極を含み、前記体腔の中に導入されるように構成されている第2のプローブ、をさらに備えており、
前記制御装置は、前記少なくとも1個の第2のプローブ電極と前記体表面上の1個以上の箇所との間の前記インピーダンスを測定し、前記較正マップを用いて、前記第2のプローブ電極に関して測定されたインピーダンスを較正することにより、前記第2のプローブの第2の位置座標を決定するように、構成されている、
システム。
(23)実施態様13に記載のシステムにおいて、
前記プローブは、前記少なくとも1個のプローブ電極が配置されている変形可能な部分と、前記磁場トランスデューサが配置されている基部と、を含み、前記変形可能な部分は、変形されていない時に、既知の形状を有しており、
前記制御装置は、前記測定されたインピーダンスを較正することにより、前記基部に対する前記変形可能な部分の偏向を決定するように、構成されている、
システム。
(24)実施態様23に記載のシステムにおいて、
前記制御装置は、前記変形可能な部分が変形されていない時に、第1のインピーダンスを測定し、前記変形可能な部分が偏向している時に、第2のインピーダンスを測定し、さらに、前記第2のインピーダンスを前記第1のインピーダンスに対して比較することにより、前記プローブの偏向を決定するように、構成されている、システム。
Claims (12)
- 位置検出システムにおいて、
プローブであって、磁場トランスデューサと少なくとも1個のプローブ電極とを具備し、被験者の体腔の中に導入されるように構成されている、プローブと、
制御装置であって、前記磁場トランスデューサを用いて前記プローブの位置座標を測定し、前記少なくとも1個のプローブ電極と前記被験者の体表面上の1個以上の箇所との間のインピーダンスを測定し、さらに、測定した位置座標を用いて測定したインピーダンスを較正するように、構成されている、制御装置と、
を備えている、位置検出システム。 - 請求項1に記載のシステムにおいて、
前記磁場トランスデューサは、1個以上のコイルを含む、システム。 - 請求項1に記載のシステムにおいて、
外部磁場を発生するように構成されている外部磁場発生装置を備えており、前記外部磁場は前記磁場トランスデューサに位置信号を発生させ、
前記制御装置は、前記位置信号を受信して処理することにより、前記プローブの位置座標を測定するように構成されている、
システム。 - 請求項1に記載のシステムにおいて、
前記磁場トランスデューサは、磁場を発生するように構成されており、
前記システムは、前記磁場に応じて、位置信号を発生するように構成された外部磁場センサーをさらに備えており、
前記制御装置は、前記位置信号を受信して処理することにより、前記プローブの位置座標を測定するように構成されている、
システム。 - 請求項1に記載のシステムにおいて、
前記制御装置は、前記少なくとも1個のプローブ電極と前記1個以上の箇所における体表面電極との間に電流を流し、前記電流に応じて、前記インピーダンスを測定するように、構成されている、システム。 - 請求項5に記載のシステムにおいて、
前記制御装置は、前記少なくとも1個のプローブ電極と前記体表面電極との間に、一定の電圧を維持し、前記一定の電圧において前記電流を測定するように、構成されている、システム。 - 請求項5に記載のシステムにおいて、
前記制御装置は、前記少なくとも1個のプローブ電極と前記体表面電極との間に、一定の電流を維持し、前記少なくとも1個のプローブ電極と前記体表面電極との間の電圧を測定するように、構成されている、システム。 - 請求項1に記載のシステムにおいて、
前記制御装置は、前記1個以上の箇所における少なくとも一対の体表面電極を横切って電圧を供給し、前記少なくとも1個のプローブ電極における電圧降下を検出することにより前記インピーダンスを測定するように、構成されている、システム。 - 請求項1に記載のシステムにおいて、
前記制御装置は、前記体腔の中の複数の場所において、前記磁場トランスデューサを用いて、前記位置座標を決定し、前記複数の場所における前記インピーダンスを決定し、さらに、前記複数の場所における前記インピーダンスを決定する較正マップを生成するように、構成されている、システム。 - 請求項9に記載のシステムにおいて、
前記較正マップを生成するために用いられるプローブは、第1のプローブであり、
前記システムは、少なくとも1個の第2のプローブ電極を含み、前記体腔の中に導入されるように構成されている第2のプローブ、をさらに備えており、
前記制御装置は、前記少なくとも1個の第2のプローブ電極と前記体表面上の1個以上の箇所との間の前記インピーダンスを測定し、前記較正マップを用いて、前記第2のプローブ電極に関して測定されたインピーダンスを較正することにより、前記第2のプローブの第2の位置座標を決定するように、構成されている、
システム。 - 請求項1に記載のシステムにおいて、
前記プローブは、前記少なくとも1個のプローブ電極が配置されている変形可能な部分と、前記磁場トランスデューサが配置されている基部と、を含み、前記変形可能な部分は、変形されていない時に、既知の形状を有しており、
前記制御装置は、前記測定されたインピーダンスを較正することにより、前記基部に対する前記変形可能な部分の偏向を決定するように、構成されている、
システム。 - 請求項11に記載のシステムにおいて、
前記制御装置は、前記変形可能な部分が変形されていない時に、第1のインピーダンスを測定し、前記変形可能な部分が偏向している時に、第2のインピーダンスを測定し、さらに、前記第2のインピーダンスを前記第1のインピーダンスに対して比較することにより、前記プローブの偏向を決定するように、構成されている、システム。
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| US11/182,272 | 2005-07-15 | ||
| US11/182,272 US7536218B2 (en) | 2005-07-15 | 2005-07-15 | Hybrid magnetic-based and impedance-based position sensing |
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| US7536218B2 (en) | 2009-05-19 |
| EP2163197A1 (en) | 2010-03-17 |
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| DK1743575T3 (da) | 2010-04-26 |
| US20070016007A1 (en) | 2007-01-18 |
| BRPI0602810A (pt) | 2007-03-06 |
| CA2552069C (en) | 2014-11-18 |
| AU2006203002A1 (en) | 2007-02-01 |
| KR20070009472A (ko) | 2007-01-18 |
| EP1743575B8 (en) | 2010-05-12 |
| IL176792A0 (en) | 2006-10-31 |
| ES2336477T3 (es) | 2010-04-13 |
| EP1743575B1 (en) | 2010-01-06 |
| EP1743575A3 (en) | 2007-05-02 |
| CA2552069A1 (en) | 2007-01-15 |
| MXPA06008075A (es) | 2007-06-05 |
| US20090203992A1 (en) | 2009-08-13 |
| IL176792A (en) | 2011-09-27 |
| US7848789B2 (en) | 2010-12-07 |
| CN1903122A (zh) | 2007-01-31 |
| JP2007021218A (ja) | 2007-02-01 |
| ATE454088T1 (de) | 2010-01-15 |
| AU2006203002B2 (en) | 2010-06-10 |
| DE602006011539D1 (de) | 2010-02-25 |
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