JP7118061B2 - 医療装置のための薬剤放出被膜およびその作製方法 - Google Patents
医療装置のための薬剤放出被膜およびその作製方法 Download PDFInfo
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Description
本明細書で使用される場合、バルーンカテーテルに関して用いられる「被覆される」または「被覆されている」と言う用語は、バルーン表面に適用される、またはバルーン表面と一体化された化合物または物質を意味する。この中には、薬剤、治療用化合物、並びにバルーン表面から標的への薬剤の送達を促進するためバルーン表面に適用される任意の他の物質が含まれる。
本発明の大環状トリエン免疫抑制化合物は2つ以上の実施形態を有しており、以下の表1の種のうち少なくとも1つを有するものとして記載されてもよい。
(薬物放出層製剤第1)
水溶性の血清タンパク質20%を含む水溶液を調製する。バルーンカテーテルをその溶液に浸漬し、ある期間そのまま放置する。表面に結合した放出薬はプライマー層として知られるが、周囲温度で24時間未満乾燥させる。
複数部分薬剤層は、薬剤を含む第一部分と脂質賦形剤を含む第二部分との二つの部分を有するように製剤される。複数部分薬剤層の第一部分の薬剤は、大環状トリエン免疫抑制化合物である。複数部分薬剤層の第二部分の賦形剤は、ポリマーフリーの飽和または不飽和脂肪アルコールまたは脂肪アルデヒドである。
前臨床試験中、CRC015がインビボでプライマー層の血清蛋白質(配列番号1)に高濃度で結合することが判明した。プライマー層の血清蛋白質は高い水溶性を示す一方、CRC015が高い親油性を示すことも分かった。従って、装置送達中におけるプライマー層への有害な影響に対するCRC015の保護的性質に関する試験が行われた。
シロリムスアルブミン結合は以前に報告されている(ラパミューン製品挿入)。CRC015がアルブミンに結合し、シロリムスの結合特性にCRC015が匹敵するか否かを調べるため、生理食塩水中の1.4mg/mLのウシ血清アルブミン(BSA)を含む1.485mLの試料に、アセトニトリルに溶解させた15uLのCRC-015またはシロリムスを加え、薬剤の最終濃度を10nMとした。薬剤を添加したBSA溶液を反転により混合し、周囲温度で30分間平衡化させ、薬剤をアルブミン蛋白質へ結合させた。次に、826mgの硫酸アンモニウムを各試料に添加し、その塩が完全に溶解し沈殿物が生じるまで優しく反転して混合した。次に試料を20秒間ボルテックスし、それから7200xgで6.5分間遠心分離した。各試料につき、内標準物質を含む0.750mLのメタノールおよび0.250mLのアセトニトリルを上澄み液および分離した沈殿物の両方に添加した。LCMSにより試料の薬剤容量を調べた。上澄み液の量が結合していない薬剤の量であり、沈殿した量が結合した量を示す。回復実証試験を、BSAなしで、生理食塩水プラス薬剤の溶液を用いて行った。
本発明の被膜方法並びにそれに関連する特殊な化合物は、薬剤被膜医療装置すなわちカテーテルにおいて、現在の最新技術とは明確に区別されるものである。現在の最新技術と比較し、この新しいアプローチの主な技術的特長は、カテーテルの配置中、治療用物質がバルーン表面に保持されるのと同時に、標的部位にも該治療用物質が放出されると言う点にある。
Claims (15)
- 薬剤溶出装置であって、
水溶性物質層を含むプライマー層と、
第一部分および第二部分を有する薬剤層とを有し、
前記第一部分は大環状トリエン免疫抑制化合物を有し、前記第二部分は少なくとも1つのポリマーフリー賦形剤を有し、前記ポリマーフリー賦形剤は、脂肪アルコール、脂肪アルデヒド、脂肪酸、または非イオン性表面活性剤である、
装置。 - 請求項1記載の医療装置において、前記装置は薬剤溶出バルーンカテーテルである装置。
- 請求項1~2のいずれか一項記載の装置において、前記水溶性物質は、65~70kDの分子量を有する球状血清蛋白質である装置。
- 請求項1~3のいずれか一項記載の装置において、前記水溶性物質は、配列番号1と少なくとも90%同一である血清タンパク質を有するものである装置。
- 請求項1~4のいずれか一項記載の装置において、前記水溶性物質はヒト血清アルブミンである装置。
- 請求項1~5のいずれか一項記載の装置において、前記複数部分層は、単一製剤によって構成され、前記装置の表面にある前記プライマー層上に形成されている、装置。
- 請求項1~6のいずれか一項記載の装置において、前記大環状トリエン免疫抑制は、ラパマイシン、エベロリムス、ゾタロリムス、バイオリムス、またはテムシロリムスである装置。
- 請求項1~6のいずれか一項記載の装置において、前記薬剤層は、タクロリムス、パクリタキセル、ドセタキセル、それらの類似体、またはそれらの混合物のうちの1つを有するものである装置。
- 請求項1~10のいずれか一項記載の装置において、前記ポリマーフリー賦形剤は少なくとも12の炭素原子を含む、直鎖状脂肪アルコールまたは脂肪アルデヒド、脂肪酸、または非イオン性の表面活性剤である装置。
- 請求項1~11のいずれか一項記載の装置において、前記ポリマーフリー賦形剤は、少なくとも1つの飽和または不飽和脂肪アルコールおよび/または少なくとも1つの飽和または不飽和脂肪アルデヒドである装置。
- 請求項12記載の装置において、前記ポリマーフリー賦形剤は、ヘンエイコシルアルコール、ベヘニルアルコール、エルシルアルコール、リグノセリルアルコール、セリルアルコール、1-ヘプタコサノール、モンタニルアルコール、1-ノナコサノール、ミリシルアルコール、ラクセリルアルコール、ゲジルアルコール、アラキジン酸、ベヘン酸、リグノセリン酸、およびセロチン酸から成る群から選択されるものである装置。
- 請求項1~13のいずれか一項記載の薬剤溶出装置の製造方法であって、
(a)膨張したら半径方向に拡張可能な医療装置を提供することと、
(b)10%から30%の水溶性賦形剤の水溶液を提供することと、
(c)(b)の溶液内で装置を浸漬被膜することと、
(d)前記浸漬被膜した装置を乾燥することと、
(e)大環状トリエン免疫抑制化合物および少なくとも1つの飽和脂肪アルコールのポリマーフリー賦形剤を含む溶液を(d)の装置に適用することと、
(f)(e)の装置を乾燥させることと、
を含む、方法。 - 請求項1~13のいずれか一項記載の医療装置において、前記ポリマーフリー賦形剤は、非イオン性の直鎖状脂肪アルコールを含み、前記水溶性物質は球状血清蛋白質であり、前記大環状トリエン免疫抑制化合物は、親油性の大環状トリエン免疫抑制化合物であり、前記薬剤層が最外層として形成され、前記装置が配置された後、割れ目を形成できるものである、医療装置。
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