JP2013505793A - Mriと併用可能なリードレス心臓ペースメーカー - Google Patents
Mriと併用可能なリードレス心臓ペースメーカー Download PDFInfo
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- A61N1/04—Electrodes
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- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
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- A61N1/375—Constructional arrangements, e.g. casings
- A61N1/3756—Casings with electrodes thereon, e.g. leadless stimulators
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Abstract
【解決手段】多数の特徴のうちの任意のものを含み得る植込み型電池式リードレスペースメーカーまたは生体刺激装置が提供される。生体刺激装置の1つの特徴は、広範囲のMRI条件下で生体刺激装置が安全に操作することである。生体刺激装置の1つの特徴は、MRI検査中に過剰な画像アーチファクトを回避するのに十分小さい総体積を生体刺激装置が有することである。生体刺激装置の別の特徴は、生体刺激装置の電極先端部位における組織の加熱を最小限に抑えるために、電極間の経路長を減少させたことである。生体刺激装置のさらに別の特徴は、生体刺激装置内の電流ループ面積が、MRI検査中に生体刺激装置内の誘導電流及び電圧を低下させるほど小さいことである。生体刺激装置の使用に関連する方法も含まれる。
【選択図】図1
Description
Claims (44)
- リードレス生体刺激装置であって、
人間の心臓内または心臓上に植え込まれるように適合され、1.5cm3未満の総体積を有するハウジングと、
前記ハウジングに結合された第1の電極及び第2の電極と、
前記ハウジング内に配置され、前記第1及び第2の電極に電気的に結合され、かつ電気パルスを発生させて前記第1及び第2の電極によって心臓組織に伝えるように構成されたパルス発生器と、
前記ハウジング内に配置され、前記パルス発生器に結合され、かつ電気パルス発生のためのエネルギーを供給するように構成された電池とを含むことを特徴とするリードレス生体刺激装置。 - 前記ハウジングの前記総体積が1.1cm3未満であることを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記第1の電極が前記第2の電極から2cm未満離間されていることを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記第1の電極がぺーシング/センシング電極を含むことを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記第2の電極がリターン電極を含むことを特徴とする請求項4に記載のリードレス生体刺激装置。
- 前記第1及び第2の電極が各々、ぺーシング/センシング電極を含むことを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記第1の電極がフレキシブル部材上に配置されていることを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記フレキシブル部材が固定用へリックスを含むことを特徴とする請求項7に記載のリードレス生体刺激装置。
- 少なくとも部分的に絶縁体でコーティングされている固定用へリックスをさらに含み、
前記第1の電極が、前記固定用へリックスのコーティングされていない部分を含むことを特徴とする請求項1に記載のリードレス生体刺激装置。 - 前記第2の電極が缶電極を含むことを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記第1の電極が低分極コーティングを含むことを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記第2の電極が低分極コーティングを含むことを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記第1の電極と前記第2の電極との間に配置された絶縁体をさらに含むことを特徴とする請求項1に記載のリードレス生体刺激装置。
- 前記絶縁体が、前記ハウジングのコーティングされていない部分であることを特徴とする請求項13に記載のリードレス生体刺激装置。
- 前記第1の電極が、前記絶縁体上に配置されていることを特徴とする請求項13に記載のリードレス生体刺激装置。
- リードレス生体刺激装置であって、
人間の心臓内または心臓上に植え込まれるように適合されたハウジングと、
前記ハウジングに結合された第1の電極及び第2の電極と、
前記ハウジング内に配置され、前記第1及び第2の電極に電気的に結合され、かつ電気パルスを発生させて前記第1及び第2の電極によって心臓組織に伝えるように構成されたパルス発生器と、
前記ハウジング内に配置され、前記パルス発生器に結合され、かつ電気パルス発生のためのエネルギーを供給するように構成された電池とを含み、
前記第1の電極から前記第2の電極へ向かい前記パルス発生器を通って前記第1の電極に戻るリード経路によって画定されるループ面積が、1cm2未満であることを特徴とするリードレス生体刺激装置。 - 前記ループ面積が0.7cm2未満であることを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第1の電極と前記第2の電極との間の経路長が10cm未満であることを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記経路長が2cm未満であることを特徴とする請求項18に記載のリードレス生体刺激装置。
- 前記ハウジングが1.5cm3未満の総体積を有することを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記ハウジングが1.1cm3未満の総体積を有することを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第1の電極がぺーシング/センシング電極を含むことを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第2の電極がリターン電極を含むことを特徴とする請求項22に記載のリードレス生体刺激装置。
- 前記第1の電極が固定用へリックスを含むことを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第1の電極が缶電極を含むことを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第1の電極が低分極コーティングを含むことを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第2の電極が低分極コーティングを含むことを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第1の電極と前記第2の電極との間に配置された絶縁体をさらに含むことを特徴とする請求項16に記載のリードレス生体刺激装置。
- 前記第1の電極が前記絶縁体上に配置されていることを特徴とする請求項28に記載のリードレス生体刺激装置。
- 患者の心臓内または心臓上に装着された電池式リードレス生体刺激装置を操作する方法であって、
前記患者にMRI検査を行うステップと、
前記MRI検査に対する反応として、前記リードレス生体刺激装置内に1.5mV未満の電圧を誘導するステップとを含むことを特徴とする方法。 - 前記誘導される電圧が0.25mV未満であることを特徴とする請求項30に記載の方法。
- 前記MRI検査が、心臓組織の壊死を生じさせるのに十分な前記リードレス生体刺激装置の加熱を発生させないことを特徴とする請求項30に記載の方法。
- 前記MRI検査に反応して、前記生体刺激装置において3℃未満の温度上昇がもたらされることを特徴とする請求項30に記載の方法。
- 前記患者にMRI検査を行う前記ステップが、最大50mT/mの磁場強度勾配を有するパルス勾配磁場を発生させるステップを含むことを特徴とする請求項30に記載の方法。
- 前記パルス勾配磁場が、最大20T/秒のスルーレートを有することを特徴とする請求項30に記載の方法。
- 前記生体刺激装置が、前記MRI検査中に非同期ペーシングに戻らないようにしたことを特徴とする請求項30に記載の方法。
- 植込み型電池式リードレス生体刺激装置を装着している患者のMRI画像を得る方法であって、
前記患者内に、静磁場、パルス勾配磁場及びRF磁場を発生させるステップと、
前記静磁場、前記勾配磁場及び前記RF磁場の存在下で、前記リードレス生体刺激装置内で信号を減衰させたり排除したりせずに、前記患者内で前記リードレス生体刺激装置の安全な操作を維持するステップとを含むことを特徴とする方法。 - リードレス生体刺激装置であって、
人間の心臓内または心臓上に植え込まれるように適合されたハウジングと、
前記ハウジングに結合された第1の電極及び第2の電極と、
ハウジング内に配置され、前記第1及び第2の電極に電気的に結合され、かつ電気パルスを発生させて前記第1及び第2の電極によって心臓組織に伝えるように構成されたパルス発生器と、
前記ハウジング内に配置され、前記パルス発生器に結合され、かつ電気パルス発生のためのエネルギーを供給するように構成された電池とを含み、
前記リードレス生体刺激装置が、MRI検査中に前記リードレス生体刺激装置内の信号を減少させるかまたは排除するための減衰装置を含まずに、前記MRI検査中に前記人間の心臓内または心臓上で安全に操作できるように構成されていることを特徴とするリードレス生体刺激装置。 - 前記減衰装置がRFフィルタであることを特徴とする請求項38に記載のリードレス生体刺激装置。
- 前記減衰装置が光ファイバーケーブルであることを特徴とする請求項38に記載のリードレス生体刺激装置。
- 前記減衰装置が分離システムであることを特徴とする請求項38に記載のリードレス生体刺激装置。
- 前記減衰装置が帯域消去フィルタであることを特徴とする請求項38に記載のリードレス生体刺激装置。
- 前記リードレス生体刺激装置がリードスイッチを含まないことを特徴とする請求項38に記載のリードレス生体刺激装置。
- 心臓に電気生理学的検査を行う方法であって、
心臓内に植え込まれたリードレス生体刺激装置を操作するステップと、
減衰装置を用いずにMRI検査中に前記生体刺激装置内に1.5mV未満の誘導電圧を発生させるステップとを含むことを特徴とする方法。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/568,513 | 2009-09-28 | ||
| US12/568,513 US20110077708A1 (en) | 2009-09-28 | 2009-09-28 | MRI Compatible Leadless Cardiac Pacemaker |
| PCT/US2010/050367 WO2011038330A1 (en) | 2009-09-28 | 2010-09-27 | Mri compatible leadless cardiac pacemaker |
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| JP2013505793A5 JP2013505793A5 (ja) | 2013-10-17 |
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| EP (1) | EP2470263A4 (ja) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2016528009A (ja) * | 2013-08-23 | 2016-09-15 | カーディアック ペースメイカーズ, インコーポレイテッド | 改善された伝導性通信を有するリードレスペースメーカー |
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| US10993887B2 (en) | 2017-12-03 | 2021-05-04 | Envizion Medical Ltd. | Feeding tube with electromagnetic sensor |
| JP6997918B2 (ja) | 2017-12-03 | 2022-01-18 | エンヴィジョン メディカル リミテッド | 電磁センサ付き栄養チューブ |
| US11559470B2 (en) | 2017-12-03 | 2023-01-24 | Envizion Medical Ltd. | Feeding tube with electromagnetic sensor |
| US11766385B2 (en) | 2017-12-03 | 2023-09-26 | Envizion Medical Ltd. | Feeding tube with electromagnetic sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2470263A4 (en) | 2013-11-06 |
| EP2470263A1 (en) | 2012-07-04 |
| WO2011038330A1 (en) | 2011-03-31 |
| US20110077708A1 (en) | 2011-03-31 |
| CN102711908A (zh) | 2012-10-03 |
| US20130274847A1 (en) | 2013-10-17 |
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