JP5542217B2 - 多層導体を備えるmriの条件付きで安全なリード - Google Patents
多層導体を備えるmriの条件付きで安全なリード Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/04—Electrodes
- A61N1/05—Electrodes for implantation or insertion into the body, e.g. heart electrode
- A61N1/056—Transvascular endocardial electrode systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/02—Details
- A61N1/08—Arrangements or circuits for monitoring, protecting, controlling or indicating
- A61N1/086—Magnetic resonance imaging [MRI] compatible leads
Description
例1では、植込み可能な電気的リードは、可撓性の本体、コネクタ組立体、電極、および多層コイル導体からなる。可撓性の本体は、近位端を含む近位領域と、遠位領域と、近位端から遠位領域を通って延びる長手方向の本体管腔とを有する。コネクタ組立体は、植込み可能な電気的リードを植込み可能なパルス発生器に機械的かつ電気的に接続するように構成される。電極は、遠位領域で可撓性の本体に結合され、また多層のコイル導体は、長手方向の本体管腔内で、コネクタ組立体から少なくとも1つの電極へと延びる。多層のコイル導体は、近接したピッチを有するように巻回された1または複数の電線(filars)を含む第1のコイル層と、近接したピッチを有するように巻回された1または複数の電線を含む、第1のコイル層の周囲に配置された第2のコイル層とを含む。第2のコイル層の電線は、第1のコイル層の電線と同じピッチ方向に巻回される。第1および第2のコイル層は、互いに電気的に結合され、また多層のコイル導体が、約3から3.5オームの最大DC抵抗を有するように、コネクタ組立体と電極の間に並列な導電性の経路を設けるように構成される。
例3は、例1または例2の植込み可能な電気的リードであり、第1のコイル層の1または複数の電線が、互いに電気的に絶縁されておらず、また第2のコイル層の1または複数の電線が、互いに電気的に絶縁されておらず、さらに、リードは、第1のコイル層と第2のコイル層の間に少なくとも部分的に配置された絶縁材料の層を含んでいる。
例8は、例1から例7のいずれかの植込み可能な電気的リードであり、第1のコイル層、第2のコイル層、および第3のコイル層のインダクタンスが異なっている。
construction)を有する。
導体は、外径(OD)、近接したピッチ、および時計方向もしくは反時計方向の内側コイルピッチ方向を有する内側コイル導体を含む。多層のコイル導体は、近接したピッチ、内側コイルのピッチ方向と同じ中間コイルのピッチ方向、内側コイル導体のODよりも大きい内径(ID)を有する中間コイル導体をさらに含み、中間コイル導体は、内側コイル導体の長さに沿って、内側コイル導体の周囲を半径方向に囲む。多層のコイル導体はまた、近接したピッチを有し、内側コイルのピッチ方向と同じ外側コイルのピッチ方向を備える、中間コイルを半径方向に囲む外側コイル導体を含む。内側コイル導体、中間コイル導体、および外側コイル導体は、電気的に並列に結合されて約3.5オームのDC抵抗が得られる。
形態が示されており、それを以下で詳細に説明する。しかし、本発明を、記載された特定の実施形態に限定するものではないことが意図されている。それとは反対に、本発明は、添付の特許請求の範囲で定義される本発明の範囲に含まれるすべての変更形態、均等な形態、および代替形態を含むことが意図される。
ネルギーからリード150を介して受信され得られた電圧を表すことができる。リード150を介して取得されたRFエネルギーは、例えば、MRIスキャナによって生成された回転するRF磁場から得ることができ、それは、導電性の組織において、回転する磁場ベクトルに対して直角な平面に電場を生成する。リード150の長さに沿ったこれらの電場の接線方向成分は、リード150に結合される。電圧(Vi)265は、したがって、リード150の長さに沿って、接線方向の電場の積分(すなわち、電場の線積分)に等しい。
周囲組織に対して通常接触が行われるリード150の先端部の温度は、275で(すなわち、「Zb」で)放散される電力に部分的に関連しており、それは、次いで、Vbの2乗に関係する。275で放散された電力から生ずる温度上昇を最小化するためには、したがって、リード150のインピーダンスZI(270)も最大化しながら、Vi(265)およびZc(280)を最小化することが望ましい。或る実施形態では、リード150のインピーダンスZI(270)は、MRIスキャナのRF周波数で増加させることができ、それが、接触点275における周囲の体組織へと放散されるエネルギーを低減することを助ける。
る先端電極312をさらに含む。PG140(図1を参照のこと)の機能的な要件、および患者の治療の必要性に応じて、リード150の遠位領域250は、さらなる電極を含むことができる。例えば、或る実施形態では、1対のコイル電極255、257を、心臓160に除細動ショックを与えるためのショック電極として機能するように使用することができる。或る実施形態では、リード150は、ペーシング/感知電極としても動作可能であり、かつ先端電極312に加えて、またはそれに代えて含むことのできる、リード150の遠位先端に対して近位にある低電圧(例えば、リング)電極を含むことができる。簡単に言うと、リード150は、本発明の実施形態の範囲に含まれる任意の数の電極構成を組み込むことができる。
00を含み、また導体410、415、および420は、管腔390、395、および400内にそれぞれ配置される。導体410、415、および420のそれぞれは、各管腔390、395、400内で長手方向に延び、かつ電極(例えば、図3の電極312、255、または257)に、さらにコネクタ組立体310の電気的な接点に電気的に結合される。
部の交番磁場に曝されたとき、多層のコイル導体420が、約3.0〜3.5オームの最大DC抵抗、および高インピーダンスを有するように構成される。2層のコイル導体415は、図5で示されたコイル導体420と実質的に同様の方法で構成することができ、2つのコイル導体層を含むだけであることが理解されよう。
うに別々に最適化されうる。
Claims (19)
- 植込み可能な電気的リードであって、
近位端を含む近位領域と、遠位領域と、前記近位端から前記遠位領域を通って延びる長手方向の本体管腔とを有する可撓性の本体と;
植込み可能な電気的リードを、植込み可能なパルス発生器に機械的かつ電気的に接続するように構成されたコネクタ組立体と;
前記遠位領域で前記可撓性の本体に結合される電極と;
前記コネクタ組立体から少なくとも前記電極へと前記長手方向の本体管腔内で延びる多層のコイル導体と
を備え、
前記多層のコイル導体は、
近接したピッチを有するように巻回された1または複数の電線である第1電線を含む第1のコイル層と;
前記第1のコイル層の周囲に配置された第2のコイル層であって、前記第2のコイル層は、近接したピッチを有するように巻回された1または複数のワイヤである第2電線を含み、前記第2電線は、前記第1電線と同じピッチ方向に巻回される、第2のコイル層と
を含み、
前記第1のコイル層および前記第2のコイル層は、互いに電気的に結合され、
前記第1のコイル層および前記第2のコイル層は、前記コネクタ組立体と前記電極の間で並列な導電性の経路を提供することによって、前記多層のコイル導体が最大で約3から3.5オームのDC抵抗を有するように構成される、植込み可能な電気的リード。 - 前記第1電線および前記第2電線は、個々に電気的に絶縁される、
請求項1記載の植込み可能な電気的リード。 - 1または複数の前記第1電線は、互いに電気的に絶縁されておらず、
1または複数の前記第2電線は、互いに電気的に絶縁されておらず、
前記リードはさらに、前記第1のコイル層と前記第2のコイル層の間に少なくとも部分的に配置された絶縁材料の層を含む、
請求項1記載の植込み可能な電気的リード。 - 1または複数の前記第1電線および1または複数の前記第2電線は、銀のコア、およびコバルト・ニッケル・モリブデン合金の外側被覆を含む引抜き充填管(DFT(登録商標))ワイヤから作られる、
請求項1記載の植込み可能な電気的リード。 - 前記第1電線は、最大で約0.00254センチメートル(0.001インチ)の電線太さを有し、
前記第2電線は、最大で約0.00762センチメートル(0.003インチ)の電線太さを有する、
請求項1記載の植込み可能な電気的リード。 - 前記植込み可能な電気的リードはさらに、前記第2のコイル層の周囲に配置された第3のコイル層を備え、
前記第3のコイル層は、近接したピッチで、かつ前記第1電線および前記第2電線と同じピッチ方向に巻回された1または複数の電線である第3電線を含む、
請求項1記載の植込み可能な電気的リード。 - 前記第3のコイル層は、最大で約0.01016センチメートルの電線太さを有する、
請求項6記載の植込み可能な電気的リード。 - 前記第1のコイル層、前記第2のコイル層、および前記第3のコイル層のインダクタンスは、互いに異なる、
請求項7記載の植込み可能な電気的リード。 - 前記第1のコイル層および前記第2のコイル層は、1電線、2電線、3電線、または4電線の構成を有する、
請求項1記載の植込み可能な電気的リード。 - 前記第1のコイル層は、両端を含めて、0.00254センチメートル(0.001インチ)と0.00508センチメートル(0.002インチ)の間の電線太さを有する、
請求項1記載の植込み可能な電気的リード。 - 前記第1のコイル層は、1から4電線の構成を備えた0.00178センチメートル(0.0007インチ)の引抜き充填管(DFT(登録商標))ワイヤから形成され、
前記第1のコイル層の外径は、0.01016センチメートル(0.004インチ)未満である、
請求項1記載の植込み可能な電気的リード。 - 前記第2のコイル層は、両端を含めて、0.00178センチメートル(0.0007インチ)と0.00762センチメートル(0.003インチ)の間の電線太さを有する、
請求項11記載の植込み可能な電気的リード。 - 植込み可能な医療用リードであって、
近位端を含む近位領域と、遠位領域と、前記近位端から前記遠位領域を通って延びる長手方向の本体管腔とを有する可撓性の本体と;
植込み可能な医療用リードを、植込み可能なパルス発生器に機械的かつ電気的に接続するように構成されたコネクタ組立体と;
前記遠位領域で前記可撓性の本体に結合される電極と;
前記コネクタ組立体から少なくとも前記電極へと前記長手方向の本体管腔内で延びる多層のコイル導体と
を備え、前記多層のコイル導体は、
外径(OD)と、近接したピッチと、時計方向または反時計方向の内側コイルピッチ方向とを有する内側コイル導体と;
近接したピッチと、前記内側コイルピッチ方向と同じ中間コイルピッチ方向と、前記内側コイル導体の前記外径(OD)よりも大きい内径(ID)とを有する中間コイル導体であって、前記中間コイル導体は、前記内側コイル導体の長さに沿って前記内側コイル導体を半径方向に囲む、中間コイル導体と;
前記中間コイル導体を半径方向に囲む外側コイル導体であって、前記外側コイル導体は、近接したピッチと、前記内側コイルピッチ方向と同じ外側コイルピッチ方向とを有する、外側コイル導体と
を含み、
前記内側コイル導体と、前記中間コイル導体と、前記外側コイル導体は、電気的に並列に結合され、約3.5オームのDC抵抗が得られる、植込み可能な医療用リード。 - 前記医療用リードはさらに、前記内側コイル導体、前記中間コイル導体、または前記外側コイル導体のうちの1または複数を囲む絶縁材料の1または複数の層を含む、
請求項13記載の植込み可能な医療用リード。 - 前記内側コイル導体、前記中間コイル導体、または前記外側コイル導体は、1から4電線の構成を有し、かつそれぞれは、異なるピッチを有する、
請求項13記載の植込み可能な医療用リード。 - 前記内側コイル導体は、0.00254センチメートル(0.001インチ)以下の電線太さを有する、
請求項13記載の植込み可能な医療用リード。 - 前記内側コイル導体は、1〜4電線の組立体と、0.01016センチメートル(0.004インチ)未満の外径(OD)とを備えた0.00178センチメートル(0.0007インチ)の引抜き充填管(DFT(登録商標))ワイヤから形成される、
請求項16記載の植込み可能な医療用リード。 - 前記外側コイル導体は、両端を含めて、0.00178センチメートル(0.0007インチ)と0.00762センチメートル(0.003インチ)の間のワイヤ直径を有する、
請求項17記載の植込み可能な医療用リード。 - 前記内側コイル導体の層と、前記中間コイル導体の層と、および前記外側コイル導体の層との電線のそれぞれは、個々に絶縁される、
請求項13記載の植込み可能な医療用リード。
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US29155709P | 2009-12-31 | 2009-12-31 | |
US61/291,557 | 2009-12-31 | ||
PCT/US2010/055653 WO2011081713A1 (en) | 2009-12-31 | 2010-11-05 | Mri conditionally safe lead with multi-layer conductor |
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JP5542217B2 true JP5542217B2 (ja) | 2014-07-09 |
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US (2) | US8798767B2 (ja) |
EP (1) | EP2519305B1 (ja) |
JP (1) | JP5542217B2 (ja) |
CN (1) | CN102655908B (ja) |
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CN102655908A (zh) | 2012-09-05 |
AU2010337313B2 (en) | 2014-04-24 |
CN102655908B (zh) | 2015-04-22 |
AU2010337313A1 (en) | 2012-05-03 |
JP2013516223A (ja) | 2013-05-13 |
US8798767B2 (en) | 2014-08-05 |
WO2011081713A1 (en) | 2011-07-07 |
EP2519305A1 (en) | 2012-11-07 |
US20110160829A1 (en) | 2011-06-30 |
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US9199077B2 (en) | 2015-12-01 |
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