JP2020049277A - 急性虚血性脳卒中の治療方法および治療システム - Google Patents
急性虚血性脳卒中の治療方法および治療システム Download PDFInfo
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Abstract
Description
本出願は、(1)2013年12月23日に出願の「Methods and Systems for Treatment of Acute Ischemic Stroke」と題された米国特許仮出願第61/919,945号;(2)2014年11月21日に出願の「Methods and Systems for Treatment of Acute Ischemic Stroke」と題された米国特許仮出願第62/083,128号;(3)2014年7月28日に出願の「Intravascvular Catheter with Smooth Transitions of Flexibility」と題された米国特許仮出願第62/029,799号;(4)2014年11月4日に出願の「Transcarotid Neurovascular Catheter」と題された米国特許仮出願第62/075,101号;(5)2014年9月4日に出願の「Methods and Devices for Transcarotid Access」と題された米国特許仮出願第62/046,112号;および(6)2014年11月4日に出願の「Methods and Devices for Transcarotid Access」と題された米国特許仮出願第62/075,169号に対する優先権を主張する。これらの特許仮出願の開示は、参照によりその全体が本明細書に組み込まれ、この出願日に対する優先権を主張する。
本明細書で記載されるのは、動脈アクセスデバイスで、本明細書においては、動脈アクセスシースまたはシースシステムとしても参照される。米国特許出願公開第2014/02196769号、および2014年11月4日に出願され、「METHODS AND DEVICES FOR TRANSCAROTID ACCESS」と題された米国特許仮出願第62/075,169号、および2014年11月10日に出願され、「METHODS AND DEVICES FOR TRANSCAROTID ACCESS」と題された米国特許出願第14/537,316号も同様に、本明細書で考察の動脈アクセスデバイスについて記載している。これらの特許は、それぞれ、参照により本明細書に組み込まれる。
本明細書で記載されるのは、動脈アクセスデバイスにより挿入されるように構成されたカテーテルである。カテーテルの例は、2014年7月28日出願の米国特許仮出願第62/029,799号および2014年11月4日に出願され、「Transcarotid Neurovascular Catheter」と題された米国特許仮出願第62/075,101号に記載されている。これら特許仮出願は参照によりその全体が本明細書に組み込まれる。
上述のように、システムに対し吸引または血流逆行デバイスもしくは構造を組み込むことが望ましい場合がある。本明細書で記載されるのは、開示システムの動脈アクセスデバイス、ガイドカテーテル、および/またはカテーテルと共に使用するように構成された吸引および血流制御要素である。吸引および血流制御要素の例は、2014年3月21日に出願された米国特許出願公開第2014/0296868号に記載されている。この特許出願は参照によりその全体が本明細書に組み込まれる。動脈アクセスデバイス2010およびカテーテル2030のいずれか一方または両方を、デバイス上の血流ライン2025または2045を介して、受動的または能動的な吸引源に接続することができる(図1)。さらに、ガイドカテーテル2105を、デバイス上の血流ライン2125を介して受動的または能動的吸引源に接続することができる(図3)。吸引のモードはデバイス毎に異なってもよい。
図39は、血栓除去デバイス15の代表的実施形態を示す。ある実施形態では、デバイスは脳循環への経頸動脈アクセス用に適合されている。デバイス15は、プッシャーワイヤー3910上に拡張可能部材3905を備える。拡張可能部材は、閉塞にまたは閉塞を横切ってすでに配置されている送達マイクロカテーテル3915中に非拡張状態で装着することができる。拡張可能部材3905は、マイクロカテーテル3915を通して、さらには閉塞を横切ってプッシャーワイヤー3910を押すことにより前進させられる。配置されると、拡張可能部材3905が拡張して閉塞に係合させるようにマイクロカテーテル3915が引き戻される。このデバイスの経頸動脈アクセス方法のための適合には、プッシャーワイヤー3910およびマイクロカテーテル3915の両方の作業長さの、経大腿送達用に適合されたデバイスの作業長さからの60〜90cmの短縮が含まれる。血栓除去デバイス15は、脳閉塞にアクセスし横切るのに十分な長さを有する動脈アクセスデバイス2010またはカテーテル2030から外に広がることが可能となる作業長を有している。より具体的には、血栓除去デバイス15は作業長が80〜120cmである。さらに、この適合は、マイクロカテーテル3915の遠位柔軟部分の長さを短縮して、標的サイトへのデバイスの送達性を向上させることを含めてもよい。血栓除去デバイス15は、閉塞を複数片に破壊しないで、単一片として閉塞を除去するように構成することができる。これにより、凝血塊の位置に対し遠位の塞栓の生成を最小限にするかまたは無くすことができる。ある実施形態では、拡張可能な部材3905が血栓位置で拡張されると、拡張可能な部材は一定期間その位置に維持され、その結果生成された血栓を通過する血流により血栓を溶解させるための血栓を通る灌流チャネルが形成される。このような実施形態では、拡張可能な部材3905は、患者の体外に回収するために血栓の一部を捕獲することが可能であるが、必須ではない。血栓の十分な部分が、閉塞を通して所望の血流チャネルを形成するように溶解されると、または得られた血流によって閉塞の完全な除去が達成されると、拡張可能な部材3905は、カテーテルまたはアクセスシース内に引き出して、その後、患者から取り出すことができる。拡張可能な部分は、シース内に引き出している間に、血栓の一部または全てを捕獲してもよい。
ある実施形態では、システムは、例えば、動脈アクセスデバイス2010を通って血栓性閉塞10の遠位側のサイトまで送達された灌流カテーテルを介して、血栓性閉塞および虚血脳組織よりも遠位側の脳血管系を灌流する方法を含むことができる。灌流カテーテルは、所望の位置に灌流溶液を送達するように構成されている。灌流溶液は、例えば、受動的な逆流回路3500の血流ラインからまたは別の動脈からの自家動脈血、酸素化溶液、または他の神経保護剤を含んでいてもよい。さらに、灌流溶液は、脳組織を冷却するために低体温にされていても、虚血期間中の脳損傷を最小限にすることが明らかになっている別の戦略であってもよい。灌流カテーテルは、血栓溶解療法に準ずる動脈内の血栓溶解剤のボーラスを送達するために使用してもよい。通常、血栓溶解療法では、ボーラスを送達した後、閉塞が取り除かれるまでに1〜2時間またはそれ以上かかることがある。機械的な血栓除去術ではまた、閉塞された動脈を首尾よく再開通させるまでに1〜2時間かかる場合がある。虚血性領域の遠位の灌流は、脳卒中の治療手技中の脳損傷のレベルを最小限にすることができる。遠位灌流の実施形態を以下で記載する。
自動閉鎖要素、縫合に基づく閉鎖要素、静水圧封止要素を含むいずれかのタイプの閉鎖要素を、手技の最後に動脈アクセスデバイス2010を引き抜く前に、総頸動脈壁の貫通部にまたはその周囲に配置することができる。経頸動脈血管閉鎖用として特に構成されている血管閉鎖方法およびデバイスが本明細書で記載される。「Suture Delivery Device」という名称の米国特許出願公開第20100042118号、および「Vessel Closure Clip Device」と題された米国特許出願公開第20100228269号には、代表的な閉鎖デバイスおよび方法が記載されている。これらの特許出願公開は、参照によりその全体が本明細書に組み込まれる。経頸動脈血管閉鎖デバイスおよび方法のさらなる例は、2014年5月16日に出願された米国特許仮出願第61/994,623号に記載されている。この特許仮出願は参照によりその全体が本明細書に組み込まれる。2014年11月4日に出願された、「Vessel Access and Closure Assist System and Method」と題された米国特許仮出願第62/074,964号、および「Suture Closure Device」と題された米国特許出願第12/540,341号もまた、参照によりその全体が本明細書に組み込まれる。
図1に示すように、動脈アクセスデバイス2010は経頸動脈的に患者の直接総頸動脈CCA中に導入される。これは経皮的穿刺または直接的な切開によって行うことができる。穿刺の場合、最初の動脈穿刺を正確に行うために超音波画像処理を使用することができる。動脈アクセスデバイス2010は、遠位端が総頸動脈または内頸動脈ICAの近位もしくは遠位の頸部、錐体部もしくは内頸動脈空洞部に配置されるように、血管系を通される。取り外し可能な近位延長部は、蛍光透視下で、使用者の手が放射線による被ばくなしに、動脈アクセスデバイス2010を設置するために使用することができる。2010年7月12日に出願された米国特許出願公開第2011/0034986号には、取り外し可能な近位延長部の代表的実施形態について記載されている。この特許出願公開は参照により本明細書に組み込まれる。
本明細書の開示内容は、以下の態様を含み得る。
(態様1)
動脈を治療するためのデバイスのシステムであって、
動脈中に介入カテーテルを導入するように構成された動脈アクセスシースであって、動脈アクセスシースは、頸動脈アクセスサイトを介して総頸動脈中に導入される寸法および形状にされたシース本体を含み、第1の細長い本体が前記総頸動脈中に配置されたときに、前記シース本体が、カテーテルを前記総頸動脈に導入するための通路を提供する内腔を画定し、前記シース本体は、近位部および前記近位部より柔軟な最遠位部を有し、前記シース本体の全長に対する前記最遠位部の全体長さの比が、前記シース本体の全長の1/10〜1/2である、動脈アクセスシースと、
前記シース本体の内腔内に配置可能な細長い拡張器であって、前記動脈アクセスシースおよび前記拡張器を共に前記総頸動脈中に導入することができる、拡張器と、
頸動脈アクセスサイトを介して、前記動脈アクセスシースの内腔を通って総頸動脈中に導入される寸法および形状にされた細長いカテーテル本体から形成されたカテーテルであって、前記カテーテル本体が前記頸動脈中の前記アクセス位置を介して前記総頸動脈を通って頭蓋内動脈の遠位に進められる寸法および形状にさられ、前記カテーテル本体が40cm〜70cmの長さを有し、前記カテーテル本体が最近位部および最遠位部を有し、前記最近位部は前記カテーテル本体の最も硬い部分であり、前記カテーテル本体は、使用中に前記最遠位部が頭蓋内動脈中に配置可能で且つ前記最近位部の少なくとも一部が前記総頸動脈中に配置されるような全長および最遠位部長さを有する、カテーテルと、を含むシステム。
(態様2)
前記カテーテル本体の前記最遠位部が、5cm〜15cmの長さである、態様1に記載のシステム。
(態様3)
前記カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも85%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、態様1に記載のシステム。
(態様4)
前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも71%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、態様1に記載のシステム。
(態様5)
前記カテーテル本体が、体温でのヒト血液の粘度を有する流体に対し、少なくとも205mL/分の実際の吸引速度を達成する、態様1に記載のシステム。
(態様6)
前記カテーテル本体が、体温でのヒト血液の粘度を有する流体に対し、少なくとも321mL/分の実際の吸引速度を達成する、態様1に記載のシステム。
(態様7)
前記介入カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも59%大きい実際の吸引速度を達成することができる、態様1に記載のシステム。
(態様8)
前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも23%大きい実際の吸引速度を達成することができる、態様1に記載のシステム。
(態様9)
前記シース本体は、前記シース本体の遠位領域が、前記シース本体の近位領域の大きい直径に比べて縮小された直径を有するように、階段状になっており、
同様に、前記カテーテル本体は、前記カテーテル本体の遠位領域が、前記カテーテル本体の近位領域の大きい直径に比べて縮小された直径を有するように、階段状になっている、態様1に記載のシステム。
(態様10)
前記カテーテル本体の内径および外径の両方が階段状になっている、態様9に記載のシステム。
(態様11)
前記カテーテル本体の近位領域の前記大きい直径が、前記カテーテル本体の遠位領域の直径より10〜25%大きい直径を有する、態様9に記載のシステム。
(態様12)
前記カテーテル本体の遠位領域が、10〜25cmの長さである、態様9に記載のシステム。
(態様13)
前記介入カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも179%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、態様9に記載のシステム。
(態様14)
前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも128%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、態様9に記載のシステム。
(態様15)
前記カテーテルが、前記動脈アクセスシースの長手方向軸に沿って前記動脈アクセスシースの遠位端から遠位方向に伸縮自在に伸びて、前記動脈アクセスシースと前記カテーテルとの間で連続的な内腔を形成することができるように、前記カテーテルが、前記動脈アクセスシースに伸縮自在に取り付けられており、
前記カテーテルが、前記動脈アクセスデバイスの遠位端を越えて伸びないように伸縮自在に後退することができる、態様1に記載のシステム。
(態様16)
前記シース本体が、15〜30cmの長さであり、前記カテーテルが10〜15cmの長さである、態様1に記載のシステム。
(態様17)
前記介入カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも337%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、態様15に記載のシステム。
(態様18)
前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも251%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、態様15に記載のシステム。
Claims (18)
- 動脈を治療するためのデバイスのシステムであって、
動脈中に介入カテーテルを導入するように構成された動脈アクセスシースであって、動脈アクセスシースは、頸動脈アクセスサイトを介して総頸動脈中に導入される寸法および形状にされたシース本体を含み、第1の細長い本体が前記総頸動脈中に配置されたときに、前記シース本体が、カテーテルを前記総頸動脈に導入するための通路を提供する内腔を画定し、前記シース本体は、近位部および前記近位部より柔軟な最遠位部を有し、前記シース本体の全長に対する前記最遠位部の全体長さの比が、前記シース本体の全長の1/10〜1/2である、動脈アクセスシースと、
前記シース本体の内腔内に配置可能な細長い拡張器であって、前記動脈アクセスシースおよび前記拡張器を共に前記総頸動脈中に導入することができる、拡張器と、
頸動脈アクセスサイトを介して、前記動脈アクセスシースの内腔を通って総頸動脈中に導入される寸法および形状にされた細長いカテーテル本体から形成されたカテーテルであって、前記カテーテル本体が前記頸動脈中の前記アクセス位置を介して前記総頸動脈を通って頭蓋内動脈の遠位に進められる寸法および形状にさられ、前記カテーテル本体が40cm〜70cmの長さを有し、前記カテーテル本体が最近位部および最遠位部を有し、前記最近位部は前記カテーテル本体の最も硬い部分であり、前記カテーテル本体は、使用中に前記最遠位部が頭蓋内動脈中に配置可能で且つ前記最近位部の少なくとも一部が前記総頸動脈中に配置されるような全長および最遠位部長さを有する、カテーテルと、を含むシステム。 - 前記カテーテル本体の前記最遠位部が、5cm〜15cmの長さである、請求項1に記載のシステム。
- 前記カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも85%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、請求項1に記載のシステム。
- 前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも71%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、請求項1に記載のシステム。
- 前記カテーテル本体が、体温でのヒト血液の粘度を有する流体に対し、少なくとも205mL/分の実際の吸引速度を達成する、請求項1に記載のシステム。
- 前記カテーテル本体が、体温でのヒト血液の粘度を有する流体に対し、少なくとも321mL/分の実際の吸引速度を達成する、請求項1に記載のシステム。
- 前記介入カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも59%大きい実際の吸引速度を達成することができる、請求項1に記載のシステム。
- 前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも23%大きい実際の吸引速度を達成することができる、請求項1に記載のシステム。
- 前記シース本体は、前記シース本体の遠位領域が、前記シース本体の近位領域の大きい直径に比べて縮小された直径を有するように、階段状になっており、
同様に、前記カテーテル本体は、前記カテーテル本体の遠位領域が、前記カテーテル本体の近位領域の大きい直径に比べて縮小された直径を有するように、階段状になっている、請求項1に記載のシステム。 - 前記カテーテル本体の内径および外径の両方が階段状になっている、請求項9に記載のシステム。
- 前記カテーテル本体の近位領域の前記大きい直径が、前記カテーテル本体の遠位領域の直径より10〜25%大きい直径を有する、請求項9に記載のシステム。
- 前記カテーテル本体の遠位領域が、10〜25cmの長さである、請求項9に記載のシステム。
- 前記介入カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも179%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、請求項9に記載のシステム。
- 前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも128%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、請求項9に記載のシステム。
- 前記カテーテルが、前記動脈アクセスシースの長手方向軸に沿って前記動脈アクセスシースの遠位端から遠位方向に伸縮自在に伸びて、前記動脈アクセスシースと前記カテーテルとの間で連続的な内腔を形成することができるように、前記カテーテルが、前記動脈アクセスシースに伸縮自在に取り付けられており、
前記カテーテルが、前記動脈アクセスデバイスの遠位端を越えて伸びないように伸縮自在に後退することができる、請求項1に記載のシステム。 - 前記シース本体が、15〜30cmの長さであり、前記カテーテルが10〜15cmの長さである、請求項1に記載のシステム。
- 前記介入カテーテルが、115cmの長さおよび0.058インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも337%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、請求項15に記載のシステム。
- 前記介入カテーテルが、105cmの長さおよび0.072インチの直径の内腔を有するカテーテルの吸引速度よりも、少なくとも251%大きい吸引速度を達成することができ、吸引速度が、体温でのヒト血液の粘度を有する流体によるチューブ中の層流に対するポアズイユの法則に基づき計算される、請求項15に記載のシステム。
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