JP2018015650A - 衝撃波バルーンカテーテル装置 - Google Patents
衝撃波バルーンカテーテル装置 Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
- A61B17/22012—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
- A61B17/22022—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement using electric discharge
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- A—HUMAN NECESSITIES
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- A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
- A61B17/22012—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
- A61B17/2202—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement the ultrasound transducer being inside patient's body at the distal end of the catheter
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- A61B17/22—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for
- A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
- A61B17/22029—Means for measuring shock waves
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- A61B17/225—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for for extracorporeal shock wave lithotripsy [ESWL], e.g. by using ultrasonic waves
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- A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
- A61B17/22012—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
- A61B17/2202—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement the ultrasound transducer being inside patient's body at the distal end of the catheter
- A61B2017/22021—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement the ultrasound transducer being inside patient's body at the distal end of the catheter electric leads passing through the catheter
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- A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
- A61B17/22012—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
- A61B2017/22024—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement with a part reflecting mechanical vibrations, e.g. for focusing
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- A61B17/22004—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves
- A61B17/22012—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement
- A61B2017/22025—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for using mechanical vibrations, e.g. ultrasonic shock waves in direct contact with, or very close to, the obstruction or concrement applying a shock wave
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- A61B2017/22038—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with a guide wire
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- A61B2017/22051—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
- A61B2017/22057—Optical properties
- A61B2017/22058—Optical properties reflective
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- A61B2017/22051—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
- A61B2017/22061—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation for spreading elements apart
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- A61B2017/22051—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation
- A61B2017/22062—Implements for squeezing-off ulcers or the like on the inside of inner organs of the body; Implements for scraping-out cavities of body organs, e.g. bones; Calculus removers; Calculus smashing apparatus; Apparatus for removing obstructions in blood vessels, not otherwise provided for with an inflatable part, e.g. balloon, for positioning, blocking, or immobilisation to be filled with liquid
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Abstract
【課題】衝撃波バルーンカテーテル装置の提供。【解決手段】身体の管腔の閉塞物を破壊する装置は、細長いキャリアと、該キャリアの周囲に配置され、該キャリアに密着されたバルーンであって該バルーンを膨張させる流体を受け入れるバルーンと、該バルーンの中に機械的な衝撃波を生じさせる、前記バルーンの中の少なくとも1つの電極を有するアーク発生器とを備えるカテーテルを含む。前記装置は、前記アーク発生器に電気エネルギーを提供する電源を含む。【選択図】図4
Description
本願は、2008年6月13日に出願された米国仮出願第60/061,170号に基づく優先権を主張する。この仮出願は、参照することによりその全体が本明細書に取り込まれる。
本発明は、拡張カテーテルが、病変部を拡張しかつ動脈の通常の血流を回復させるため、前記病変部を横切るために使用される末梢血管形成術又は経皮冠動脈血管形成術のための治療装置に関する。本発明は、特に、前記病変部が前記動脈の壁の石灰化病変部であるときに有用である。
石灰化病変部は、石灰化プラークを破壊しかつ該石灰化プラークを血管壁へ押し込むために高い圧力(10ないし15気圧又は30気圧)を要する。このような圧力は、血管の反発、解離、血栓形成及び高度の再狭窄の原因となり得る外傷を前記血管壁に与える。非求心性の石灰化病変部は、高い圧力を受けているときに血管の自由壁に過度の圧力を生じさせることがある。高い圧力へ膨張したときの血管形成術用のバルーンは特定の最大直径を有する。前記バルーンは前記最大直径まで膨張するが、求心性の病変部のもとでの血管の開口部は典型的に前記最大直径より著しく小さい。血液の通路を開くために圧力が増加されたとき、前記バルーンは、(前記石灰化病変部の開口部が、破壊された開口部となる前に)前記石灰化病変部の開口部の大きさに制限される。
前記石灰化病変部が壊れる又は割れるまで、圧力が上昇するにつれて前記バルーンに著しく多くの量のエネルギーが蓄えられる。その後、前記エネルギーは、解放され、前記バルーンをその最大寸法へ急速に膨張させ、前記血管壁に圧力を加えかつ損傷を与えることがある。
本発明に係るカテーテルは、細長いキャリアと、該キャリアの周囲に配置され、該キャリアに密着された拡張用のバルーンであって該バルーンを膨張させる流体を受け入れるバルーンと、該バルーンの中に機械的な衝撃波を生じさせる、前記バルーンの中の少なくとも1つの電極を有するアーク発生器とを備える。
前記電極は、一対の金属電極のうちの1つの金属電極とすることができる。前記一対の金属電極は、径方向に間隔を置かれたもの又は長さ方向に間隔を置かれたものとすることができる。前記電極は、ステンレス鋼で作られたものとすることができる。
前記バルーンは、非柔軟な材料又は柔軟な材料で作られている。前記バルーンは、該バルーンの表面に形成された少なくとも1つの突起を有するものとすることができる。
前記カテーテルは、反射されたエネルギーを感知するセンサーを備えるものとすることができる。前記センサーは前記電極より末梢側にある。前記センサーは前記キャリアに取り付けられている。
前記カテーテルは、前記バルーンの中に配置され、前記衝撃波の焦点を合わせる反射体を備えるものとすることができる。前記反射体は前記電極を形成する。前記カテーテルは中心線を有し、前記反射体は前記中心線から隔てて前記衝撃波の焦点を合わせる。
前記流体は生理食塩水とすることができる。前記流体は、X線造影剤を含むものとすることができる。
前記カテーテルは、ガイドワイヤを受け入れる管腔を備える。前記管腔は前記キャリアにより形成されている。
本発明に係る治療装置は、細長いキャリアと、該キャリアの周囲に配置され、該キャリアに密着された拡張用のバルーンであって該バルーンを膨張させる流体を受け入れるバルーンと、該バルーンの中に機械的な衝撃波を生じさせる、前記バルーンの中の少なくとも1つの電極を有するアーク発生器とを備えるカテーテルを含む。前記治療装置は、前記アーク発生器に電気エネルギーを提供する電源を含む。
前記電源は、好ましくは、パルス状の高電圧を提供する。前記電源は、選択可能なパルス持続時間、選択可能な電圧振幅及び(又は)選択可能なパルス繰り返し数を有する高電圧パルスを提供する。
前記治療装置は、前記衝撃波を心臓のR波と同期させるR波検出器を含むものとすることができる。
前記電極は、一対の金属電極のうちの1つの金属電極とすることができる。前記一対の金属電極は、径方向に間隔を置かれたもの又は長さ方向に間隔を置かれたものとすることができる。前記電極は、ステンレス鋼で作られたものとすることができる。
前記バルーンは、非柔軟な材料又は柔軟な材料で作られている。前記バルーンは、該バルーンの表面に形成された少なくとも1つの突起を有するものとすることができる。
前記カテーテルは、反射されたエネルギーを感知するセンサーを備えるものとすることができる。前記センサーは前記電極より末梢側にある。前記センサーは前記キャリアに取り付けられている。
前記カテーテルは、前記バルーンの中に配置され、前記衝撃波の焦点を合わせる反射体を備えるものとすることができる。前記反射体は前記電極を形成する。前記カテーテルは中心線を有し、前記反射体は前記中心線から隔てて前記衝撃波の焦点を合わせる。
前記流体は生理食塩水とすることができる。前記流体は、X線造影剤を含むものとすることができる。
前記カテーテルは、ガイドワイヤを受け入れる管腔を備える。前記管腔は前記キャリアにより形成されている。
本発明に係る治療方法は、細長いキャリアと、該キャリアの周囲に配置され、該キャリアに密着された拡張用のバルーンであって該バルーンを膨張させる流体を受け入れるバルーンと、該バルーンの中に機械的な衝撃波を生じさせる、前記バルーンの中の少なくとも1つの電極を有するアーク発生器とを備えるカテーテルを用意することを含む。前記治療方法は、患者の身体の管腔の閉塞物に隣接して前記管腔に前記カテーテルを挿入すること、前記バルーンに流体を入れること、前記バルーンの中に一連の機械的衝撃を与えるために前記アーク発生器に高電圧パルスを加えることを含む。
前記治療方法は、前記患者の心臓のR波を検出すること、前記機械的衝撃を、検出されたR波と同期させることを含む。
前記治療方法は、前記衝撃波の強度を変化させるために前記高電圧パルスの繰り返し数、振幅及び持続時間の1つを変更することを含む。
前記治療方法は、前記カテーテルの中の反射されたエネルギーを感知することを含む。
前記治療方法は、前記管腔にガイドワイヤを配置すること、該ガイドワイヤに沿って前記カテーテルを前記管腔へ案内することを含む。
前記治療方法は、前記衝撃波の焦点を合わせることを含む。前記衝撃波は前記カテーテルの中心線から隔てて焦点を合わせられる。
前記治療方法は、前記流体にX線造影剤を加えること、蛍光透視法により前記カテーテルを可視化することを含む。
本発明の特徴が特許請求の範囲に記載されている。本発明の様々な実施例が、本発明の代表的な特徴及び利点とともに、添付の図面に関する以下の説明を参照することにより理解される。いくつかの図面において類似の符号は同一の要素を特定する。
図1に、従来のオーバーザワイヤータイプの血管形成術用バルーンカテーテル10の治療用の端部を示す。このようなカテーテルは、通常、生理食塩水のような液体により膨張されたとき、一定の最大寸法を有する。
図2に、本発明の実施例に係る、拡張のための血管形成術用バルーンカテーテル20を示す。カテーテル20は、中空のシース21のような細長いキャリアと、シース21の周囲にあってシール部分23がシース21に密着された拡張用のバルーン26とを備える。バルーン26は、シース21を取り巻く環状の流路27を形成し、該流路を経て生理食塩水のような液体が、バルーン26を膨張させるために該バルーンの中に入ることを許されている。流路27は、バルーン26が、前記液体で満たされたバルーン26の内部に2つの電極22、24を備えることを可能にする。各電極22、24は高電圧パルス発生器30に接続されている。電極22、24は、ステンレス鋼のような金属で作られており、所定の電圧及び電流についての再現可能なアークの発生を可能にするため、制御された間隔を置いて配置されている。前記液体の中の電極22、24の間の電気的なアークは前記液体の中に衝撃波を発生させるために用いられる。可変の高電圧パルス発生器30は、バルーン26の中及び治療されている動脈(図示せず)の中に連続的な衝撃波を生じさせるため、電極22、24に連続的なパルスを送るために使用される。前記衝撃波の大きさは、パルス状の電圧の大きさ、電流、持続時間及び繰り返し数の制御により制御される。バルーン26の絶縁性は電気的な衝撃から患者を保護する。
バルーン26は、石灰化病変部に近接する前記動脈の壁にバルーン26を穏やかに固定するために水又は生理食塩水で満たされている。前記液体は、使用中のカテーテル20の透視を可能にするためにX線造影剤を含むものとすることができる。キャリア21は、ガイドワイヤ(図示せず)が、カテーテル20を位置へ案内するために挿入される管腔29を有する。カテーテル20を前記位置へ案内した後、医師又はオペレーターは、低いエネルギーの衝撃波から開始し、該エネルギーを、石灰化プラークを割るために必要なエネルギーへ増加させる。このような衝撃波は前記液体、バルーン26、血液及び血管壁を経て石灰化病変部へ導かれ、該石灰化病変部において、バルーン26により前記動脈の前記壁に過度の圧力が加えられることなく、前記エネルギーは、硬化したプラークを破壊する。
図3は、高電圧パルス発生器30の概略図である。図3Aに、生じた波形を示す。必要な電圧は、電極22、24の間の間隔に左右され、一般に100ないし3000ボルトである。高電圧スイッチ32が、パルスの持続時間を制御するために設定される。前記パルスの持続時間は、電極22、24の表面積に左右され、気泡を飛ばし、急速に拡大しかつ破壊する泡を生じさせるため、電流のプラズマアークを生じさせる電極の表面に前記気泡を発生させるのに十分であることを要する。前記泡はバルーン26の中に機械的衝撃波を生じさせる。このような衝撃波は数マイクロ秒とすることができる。
図4は、電極22、24の間のアーク25と、衝撃波の流れ28のシミュレーションとを示す、衝撃波カテーテル20の断面図である。衝撃波28は、電極22、24から全ての方向に放射され、バルーン26を経て血管へ伝わり、該血管において前記石灰化病変部を粉砕する。
図5に、拡張のための他のカテーテル40を示す。カテーテル40は、バルーン46の中に該バルーンの長さ方向に間隔を置いて配置された絶縁電極42、44を備える。
図6に、バルーン56の中に配置された絶縁電極52を備える拡張のためのカテーテル50を示す。絶縁電極52はバルーン56の中の単極であり、第2の極はバルーン56の中のイオン流体54である。この単極構造は、他の極としてイオン流体54を使用し、より小さいバルーン及び小型バルーンのためのカテーテルの設計を可能にする。イオン流体54は高電圧パルス発生器30に電気的に接続されている。
図7に、バルーン66の中に配置された電極62、64と、石灰化部に達するスタッド65とを備える拡張のためのカテーテル60を示す。スタッド65は、バルーン66の表面67に突起(機械的圧力ライザー)を形成し、前記衝撃波を前記血管の組織の内膜層を経て機械的に導き、前記衝撃波を石灰化病変部に直接伝える。
図8に、バルーン76の中に配置された電極72、74と、バルーン76の表面77に形成され、該表面から突出するリブ75とを備える拡張のための他のカテーテル70を示す。リブ75(図8A)は、衝撃波エネルギーを前記石灰化プラークの線状領域に集中させる突起(圧力ライザー)を形成する。
図9に、バルーン86の中に配置された電極82、84を備える拡張のための他のカテーテル80を示す。カテーテル80は、反射信号を検出するセンサー85を備える。前記石灰化プラークからの反射信号は、石灰化の性質及び病変部の粉砕の性質を明らかにするためにプロセッサー88により処理される。
図10に、石灰化病変部を破壊する従来のバルーンの圧力体積曲線を示す。図10Bに、前記バルーン(領域AからB)の中のエネルギーの増大を示し、図10Cに、前記石灰化病変部が破壊されたときの前記エネルギーの解放(領域BからC)を示す。領域Cにおいて動脈が前記バルーンの最大寸法へ拡張される。このような最大寸法は血管壁に損傷を与えることがある。図10Aに、前記バルーンの初期の膨張を示す。
図11に、本発明の実施例に係る、衝撃波を用いた石灰化病変部の破壊における様々な段階を示す圧力体積曲線を示す。バルーンは生理食塩水により膨張されている。前記バルーンは、血管壁に穏やかに固定されるために膨張されるが(領域A、図11A)、これは要件ではない。高電圧パルス発生器が衝撃波を発生させたとき(領域B及びC)、持続時間が非常に短く、非常に高い圧力は、前記石灰化病変部を徐々に破壊し、血流が遮断されないようにするために前記血管の開口部を制御可能に拡張する(図11B)。
図12に、衝撃波98が、生理食塩水で満たされたバルーン90の壁92と内膜94とを経て石灰化病変部96へ全ての方向に伝わることを示す。衝撃波98は石灰化病変部96を粉砕する。バルーン90の壁92は、内膜94に接するために非柔軟又は柔軟な材料で作られている。
図13に、衝撃波98により粉砕された石灰化プラーク96を示す。膨張したバルーン(図示せず)が血管壁でプラークを粉砕しかつ変形させた後、内膜94は、滑らかにされ、復元される。
図14は、衝撃波を、心臓の近傍の血管を治療するためのR波と同期させるために、図3に示した高電圧パルス発生器30の回路と表面心電図(EKG)102とを用いた回路1
00の図である。回路100は、R波検出器102と、高電圧スイッチ32を制御する制御器104とを備える。機械的な衝撃は、心筋を刺激し、不整脈を生じさせることがある。パルス(又はパルスの破裂)をR波と同期させることにより、本明細書で検討したような短い持続時間の衝撃波が心臓を刺激することは考えにくいが、心臓の血管又は心臓の近傍の血管に用いたときに安全性が追加される。図示のバルーンは電流からの患者の電気的絶縁を与えるが、流体として血液を用いる非バルーン又は非絶縁の方法が用いられてもよい。この場合、R波との同期は不要な不整脈に対する安全性を著しく高める。
00の図である。回路100は、R波検出器102と、高電圧スイッチ32を制御する制御器104とを備える。機械的な衝撃は、心筋を刺激し、不整脈を生じさせることがある。パルス(又はパルスの破裂)をR波と同期させることにより、本明細書で検討したような短い持続時間の衝撃波が心臓を刺激することは考えにくいが、心臓の血管又は心臓の近傍の血管に用いたときに安全性が追加される。図示のバルーンは電流からの患者の電気的絶縁を与えるが、流体として血液を用いる非バルーン又は非絶縁の方法が用いられてもよい。この場合、R波との同期は不要な不整脈に対する安全性を著しく高める。
図15に、液体で満たされた柔軟なバルーン116の中の1つの電極として機能するパラボラ反射体114により衝撃波の焦点が合わせられる拡張のためのカテーテル110を示す。他の電極112が反射体114の同軸の中心部に配置されている。反射体114を1つの電極として使用することにより、前記衝撃波の焦点を合わせることができ、前記衝撃波をカテーテル110の中心線111に対して角度(例えば、45度)をなす方向に向けることができる。この構造では、他の電極112は、反射体114の前記中心部にあり、前記液体を経て反射体114へアークを発する。カテーテル110は、該カテーテルが回転しかつ衝撃波を送るときに硬いプラークを破壊するために必要であれば、回転させることができる。
本発明の特定の実施例が示されかつ説明されているが、修正がなされてもよい。例えば、本明細書において用いられたバルブの手動作動及びバネ復帰に代え、バネ作動及び手動復帰により逆の方法で機能する構造を用いることができる。特許請求の範囲は、これに記載された本発明の真の精神及び範囲に含まれるこのような変更及び修正の全てに及ぶ。
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- 装置またはシステムまたは方法。
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JP2011524203A (ja) | 2011-09-01 |
JP6529565B2 (ja) | 2019-06-12 |
CA2727429A1 (en) | 2009-12-17 |
CA2727429C (en) | 2016-01-26 |
JP2018015649A (ja) | 2018-02-01 |
US11771449B2 (en) | 2023-10-03 |
US10039561B2 (en) | 2018-08-07 |
US20090312768A1 (en) | 2009-12-17 |
EP2300091A2 (en) | 2011-03-30 |
US20130030447A1 (en) | 2013-01-31 |
WO2009152352A8 (en) | 2010-12-09 |
JP2016137333A (ja) | 2016-08-04 |
JP2014208305A (ja) | 2014-11-06 |
ES2671898T3 (es) | 2018-06-11 |
JP2019107561A (ja) | 2019-07-04 |
US8956374B2 (en) | 2015-02-17 |
US8956371B2 (en) | 2015-02-17 |
US10959743B2 (en) | 2021-03-30 |
AU2009257368B2 (en) | 2014-09-11 |
US9011462B2 (en) | 2015-04-21 |
US20180317946A1 (en) | 2018-11-08 |
WO2009152352A2 (en) | 2009-12-17 |
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