JP2015033646A - スコアリングまたはカッティングバルーンカテーテルのための改善されたコーティング調合物 - Google Patents
スコアリングまたはカッティングバルーンカテーテルのための改善されたコーティング調合物 Download PDFInfo
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- JP2015033646A JP2015033646A JP2014228540A JP2014228540A JP2015033646A JP 2015033646 A JP2015033646 A JP 2015033646A JP 2014228540 A JP2014228540 A JP 2014228540A JP 2014228540 A JP2014228540 A JP 2014228540A JP 2015033646 A JP2015033646 A JP 2015033646A
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Classifications
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Abstract
Description
バルーンからの薬物の早発放出は主要な問題であり、さまざまな方法によって対処されてきた。それらの方法のいくつかは、たとえば保護チューブ、スリーブ、エンベロープの使用などの機械的なものである。その例は、バルーンが膨張する前に縮められるさまざまな保護シースを開示する米国特許第5,370,614号、米国特許第6,306,166号および米国特許第6,616,650号、またはバルーン拡張の際に破裂するカバーを提案する米国特許第6,419,692号である。異なるアプローチが取られているのは、小さい空洞を有する構造化したバルーン膜を開示する米国特許第5,893,840号、コーティングの付着性を高めるための粗くしたバルーン膜を有する国際公開第94/23787号、またはもっと最近では、バルーン上の薬物含有層を保護するパウチを提案する米国特許第7,108,684号、および折り畳まれたバルーンの折り目の下に選択的に薬物を配置する方法を開示する国際公開第2009/066330号である。これらの方法は効果的ではあったが、製造の複雑性およびコストを増す、または装置の取り扱いを困難にする、または(狭窄病変部の通過を容易にするためにできる限り小さく保つ必要がある)装置の直径を大きくするという不利益を有する。いくつかの実施形態において、保護膜または穿孔膜は、バルーンのスコアリング構成要素を妨げるか、組織への薬物の均一な移送を妨げるか、または患者を危険にさらすことさえある。これらの方法はどれもスコアリングまたはカッティングバルーンに応用されておらず、複雑性の増加および機械的な問題から生じる問題、またはスコアリングもしくはカッティング構造による保護エンベロープの妨害、およびその逆から生じる問題については何も分かっていない。
理論的に、抗酸化剤は患部組織のほぼ普遍的な特徴、すなわち「活性酸素種」に立ち向かうものであり、広範な医学的応用を有するはずである。実際には、非常に数少ない対照臨床試験のみが抗酸化剤の有益な効果を示している(Suzuki K.Antioxidants for therapeutic use:Why are only a
few drugs in clinical use? Advanced Drug Delivery Reviews 2009;61:287−289)。抗酸化剤は、米国特許出願第2009/0136560号においては添加剤なしでたとえば狭窄、再狭窄、アテローム性動脈硬化プラーク、および不安定プラークなどの局所的血管疾患の処置に対して有用な可能性のある薬物として言及されており、米国特許第5,571,523号においては血管平滑筋細胞におけるアポトーシスを誘導する薬剤として言及されており、国際公開第2004/022124号においては活性薬物または「水和阻害剤」として言及されている。米国特許出願第2008/0241215号においては、アテローム性動脈硬化(atheriosclerosis)に対する公知の危険因子である高脂血症の処置に対して認可された薬物であるプロブコールがステントコーティングの活性成分として提案されており、それは徐放性の調合物内に単独で、またはラパマイシンもしくは別の抗再狭窄剤と組み合わせて含まれる。米国特許第6,211,247号は、冠状動脈の介入後のさまざまな血管病態を予防または処置するために、有効用量のレスベラトロールを含有する医薬組成物を主張する。同様に、米国特許出願第2007/0037739号は、単独で、または特定化した組み合わせのいずれかで、異常な管腔細胞増殖の処置または予防に好適であるレスベラトロールを含むさまざまな生理活性剤を含む局所送達系を開示する。上記のいずれの文書も、薬物の放出速度を遅らせるための親油性薬物への添加剤としての使用を奨励するデータを含んでおらず、上記の標的病変部に達する前の薬物の付着の問題、および必要なときの迅速な放出の問題に対処する特定の組成物は開示されていない。
例えば、本願発明は以下の項目を提供する。
(項目1)
スコアリングまたはカッティングバルーンカテーテルであって、その表面の少なくとも一部に少なくとも1つの酸化非感受性薬物または酸化非感受性の無ポリマー薬物調製物と、少なくとも1つの親油性抗酸化剤とを、100重量%の前記薬物に対して3〜100重量%の前記少なくとも1つの親油性抗酸化剤の比率で有し、前記少なくとも1つの酸化非感受性薬物はタキサン、サリドマイド、スタチン、コルチコイド、およびコルチコイドの親油性誘導体から選択され、前記少なくとも1つの親油性抗酸化剤はノルジヒドログアイアレチン酸、レスベラトロールおよび没食子酸プロピルから選択される、スコアリングまたはカッティングバルーンカテーテル。
(項目2)
前記少なくとも1つの親油性抗酸化剤は、100重量%の前記少なくとも1つの薬物に対して5〜100重量%の比率で、好ましくは10〜100重量%の比率で、より好ましくは20〜100重量%の比率で、さらにより好ましくは50〜100重量%の比率で含まれる、項目1に記載のスコアリングまたはカッティングバルーンカテーテル。
(項目3)
前記少なくとも1つの酸化非感受性薬物は、前記抗酸化剤よりも親油性が高い、項目1または2に記載のスコアリングまたはカッティングバルーンカテーテル。
(項目4)
前記タキサンはパクリタキセル、プロタキセルまたはドセタキセルから選択され、好ましくはパクリタキセルである、項目1から3のいずれか1項に記載のスコアリングまたはカッティングバルーンカテーテル。
(項目5)
前記スタチンはアトルバスタチン、セリバスタチンまたはフルバスタチンから選択され、前記コルチコイドまたは前記コルチコイドの前記親油性誘導体はジプロピオン酸ベタメタゾンまたは21−パルミチン酸デキサメタゾンから選択される、項目1から3のいずれか1項に記載のスコアリングまたはカッティングバルーンカテーテル。
(項目6)
前記少なくとも1つの抗酸化剤の負荷量は、コートされるカテーテル表面に対して最大10μg/mm 2 である、項目1から5のいずれか1項に記載のスコアリングまたはカッティングバルーンカテーテル。
(項目7)
前記少なくとも1つの抗酸化剤はノルジヒドログアイアレチン酸またはレスベラトロールであり、好ましくはレスベラトロールである、項目1から6のいずれか1項に記載のスコアリングまたはカッティングバルーンカテーテル。
(項目8)
少なくとも1つの酸化非感受性薬物および少なくとも1つの抗酸化剤で無ポリマーコートされた、項目1から7のいずれか1項に記載のスコアリングまたはカッティングバルーンカテーテルであって、前記少なくとも1つの酸化非感受性薬物および少なくとも1つの抗酸化剤は、テトラヒドロフランもしくは25%(v/v)より多いテトラヒドロフランを含有する溶剤混合物に両方一緒に溶解されたか、または前記少なくとも1つの親油性抗酸化剤に対して異なる溶剤を必要に応じて選択して各々別々に溶解された、スコアリングまたはカッティングバルーンカテーテル。
(項目9)
少なくとも1つの酸化非感受性薬物および少なくとも1つの抗酸化剤で無ポリマーコートされた、項目1から7のいずれか1項に記載のスコアリングまたはカッティングバルーンカテーテルであって、前記少なくとも1つの酸化非感受性薬物および少なくとも1つの抗酸化剤は、アセトンもしくは25%(v/v)より多いアセトンを含有する溶剤混合物に両方一緒に溶解されたか、または前記少なくとも1つの親油性抗酸化剤に対して異なる溶剤を必要に応じて選択して各々別々に溶解された、スコアリングまたはカッティングバルーンカテーテル。
(項目10)
前記酸化非感受性薬物と前記抗酸化剤とが均一に混合されない様式で、少なくとも1つの酸化非感受性薬物および少なくとも1つの親油性抗酸化剤によって無ポリマーで順次コートされた、項目1から7のいずれか1項に記載のスコアリングまたはカッティングバルーンカテーテル。
(項目11)
スコアリングまたはカッティングバルーンカテーテルであって、その表面の少なくとも一部に、無ポリマーの少なくとも1つのリムス薬またはリムス薬調製物と、ノルジヒドログアイアレチン酸またはレスベラトロール、好ましくはレスベラトロールである少なくとも1つの親油性抗酸化剤とを、100重量%の前記薬物に対して3〜100重量%の前記少なくとも1つの親油性抗酸化剤の比率で有する、スコアリングまたはカッティングバルーンカテーテル。
(項目12)
前記少なくとも1つのリムス薬はmTOR阻害剤であり、好ましくはシロリムス、エベロリムス、ゾタロリムス、バイオリムス、およびテムシロリムスから選択され、より好ましくはシロリムスである、項目11に記載のスコアリングまたはカッティングバルーンカテーテル。
経皮経管的冠状動脈形成術タイプA(AngioSculpt 3.5−20mm,AngioScore,Inc.,Fremont CA,USA)のためのバルーンを、パクリタキセル単独で、またはイオプロミド(国際公開第02/076509号に従うヨウ素化造影剤)もしくは異なる量のブチル化ヒドロキシトルエン(BHT)と組み合わせてのいずれかで、コートした。溶剤:アセトン/エタノール/H2O。コートしたバルーンを、止血弁、Medtronic Launcher JL3.5 6Fガイディングカテーテル内に通して撹拌血液中(37℃)に1分間入れたときのパクリタキセル損失について試験した。十分な濃度でコーティング溶液に混合したとき、BHTはパクリタキセルの付着を改善した。
経皮経管的冠状動脈形成術タイプAのためのバルーンを、パクリタキセル単独で、またはイオプロミド(国際公開第02/076509号に従うヨウ素化造影剤)(実施例2を参照)もしくはブチル化ヒドロキシトルエン(BHT)もしくはノルジヒドログアイアレチン酸と組み合わせてのいずれかで、コートした。コートしたバルーンを、止血弁、Medtronic Launcher JL3.5 6Fガイディングカテーテル内に通して撹拌血液中(37℃)に1分間入れたときのパクリタキセル損失について試験した。十分な濃度でコーティング溶液に混合したとき、親油性抗酸化剤はパクリタキセルの付着を改善する一方で、冠状動脈内でのバルーン膨張の際の放出(別の実験で定めた)は損なわなかった。
経皮経管的冠状動脈形成術タイプAのためのバルーンを、レスベラトロールを伴わないパクリタキセルで、またはレスベラトロールと組み合わせたパクリタキセルのいずれかで、コートした。コートしたバルーンを、実施例1で説明したとおりにパクリタキセル損失について試験した。十分な濃度でコーティング溶液に混合したとき、レスベラトロールはパクリタキセルの付着を改善した。
(実施例4)
経皮経管的冠状動脈形成術タイプAのためのバルーンを、すでに折り畳まれた状態で、ポリアクリル酸を伴わないパクリタキセルで、またはポリアクリル酸およびパクリタキセルのいずれかで、コートした。ポリアクリル酸(分子量約6000D(Polysciences Inc.,USA))およびグリセロールは、バルーン上のコーティングの均一性を改善した。
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- 明細書に記載された発明。
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