JP2016534797A - 吸収性鉄基合金ステント - Google Patents
吸収性鉄基合金ステント Download PDFInfo
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Abstract
Description
の場合、該ステントは完全に吸収されたことを意味する。
の場合、該ステントは完全に吸収されたことを意味する。
ステントストラットの厚さが60〜70ミクロンである窒化純鉄ステント(即ち、表面にいずれかのコーティングが被覆されていない)を、ウサギの腹部大動脈にインプラントした。三ヶ月後、ステントを取り出し、ステントの重量損失パーセントと半径方向の支持力を測定し、ステントストラットの軸方向横断面に対してEDSスペクトル測定(図16)を行った。測定結果は、ステントの重量損失が5%であり、半径方向の支持力が120kpaである。且つ、図11に示すように、ステントストラットが最初の形状が保たれて、周囲に腐食生成物がほとんどないことは、裸の純鉄ステントの腐食速度が遅いことを明らかにしている。3年後、鉄イオン濃度の測定は、該ステントが完全に吸収されていないことを示している。
ステントストラットの厚さが60〜70ミクロンである窒化純鉄ステントの表面に、厚さが15ミクロンであるポリ乳酸−グリコール酸(乳酸とグリコール酸のモル比が50:50である)。乾燥後、吸収性鉄基合金ステントを作成した。該ポリ乳酸−グリコール酸の重量平均分子量は1.5万であり、多分散指数は1.3である。該吸収性鉄基合金ステントを、ウサギの腹部大動脈にインプラントした。三ヶ月後、ステントを取り出し、ステントの重量損失パーセントと半径方向の支持力を測定し、ステントストラットの軸方向横断面に対してEDSスペクトル測定(図17)を行った。測定結果について、ステントの重量損失が30%であり、半径方向の支持力が60kpaであることは、早期腐食が速すぎて、ステントの早期支持力の低減が速すぎることを示しており、早期にステントがインプラントされ血管に対して有効に支持することに不利になることが明らかにされる。且つ、図12に示すように、早期に鉄の腐食が速すぎるため、過剰に放出された鉄イオンが血管の吸収能力を超えて、ステントストラットの元の位置の周囲に新たな腐食生成物の堆積層が形成された。
Claims (14)
- 吸収性鉄基合金ステントであって、鉄基合金マトリックスと、該マトリックスの表面と接触する分解性ポリエステルとを含み、
前記分解性ポリエステルの重量平均分子量は2万以上且つ100万以下であり、多分散指数は1.2以上且つ30以下であることを特徴とする吸収性鉄基合金ステント。 - 前記鉄基合金マトリックスのステントストラットの厚さは、30ミクロン以上100ミクロン未満であり、前記分解性ポリエステルのコーティングの厚さは3ミクロン以上且つ35ミクロン以下であることを特徴とする請求項1に記載の吸収性鉄基合金ステント。
- 前記鉄基合金マトリックスのステントストラットの厚さは100ミクロン以上且つ300ミクロン以下であり、前記分解性ポリエステルのコーティングの厚さは10ミクロン以上且つ60ミクロン以下であることを特徴とする請求項1に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステルは、ポリ乳酸、ポリグリコール酸、ポリコハク酸エステル、ポリ(β−ヒドロキシブチレート)、ポリカプロラクトン、ポリエチレンアジペート、ポリ乳酸-グリコール酸コポリマー、ポリヒドロキシブチレートバレレートコポリマーのいずれか一つであることを特徴とする請求項1〜3のいずれか一項に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステルは、少なくとも2種類の同系の分解性ポリエステル系ポリマー、第1種類の分解性ポリエステル系ポリマーの重量平均分子量は2万以上且つ5万以下であり、第2種類の分解性ポリエステル系ポリマー重量平均分子量は6万以上且つ100万以下であり、重量パーセントで、該第1種類と第2種類の分解性ポリエステル系ポリマーの割合は1:9以上且つ9:1以下であり、前記同系の分解性ポリエステル系ポリマーは、ポリ乳酸、ポリグリコール酸、ポリコハク酸エステル、ポリ(β−ヒドロキシブチレート)、ポリカプロラクトン、ポリエチレンアジペート、ポリ乳酸-グリコール酸コポリマー及びポリヒドロキシブチレートバレレートコポリマーのいずれか一つであることを特徴とする請求項1〜3のいずれか一項に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステルは、ポリ乳酸、ポリグリコール酸、ポリコハク酸エステル、ポリ(β−ヒドロキシブチレート)、ポリカプロラクトン、ポリエチレンアジペート、ポリ乳酸-グリコール酸コポリマー及びポリヒドロキシブチレートバレレートコポリマーの少なくとも2つを物理的にブレンドしてなり、あるいは、ポリ乳酸、ポリグリコール酸、ポリコハク酸エステル、ポリ(β−ヒドロキシブチレート)、ポリカプロラクトン、ポリエチレンアジペート、ポリ乳酸-グリコール酸コポリマー及びポリヒドロキシブチレートバレレートコポリマーの少なくとも2つのモノマーを共重合してなることを特徴とする請求項1〜3のいずれか一項に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステルは、結晶化度の異なる分解性ポリエステル系ポリマーの混合物であり、前記分解性ポリエステル系ポリマーは、ポリ乳酸、ポリグリコール酸、ポリコハク酸エステル、ポリ(β−ヒドロキシブチレート)、ポリカプロラクトン、ポリエチレンアジペート、ポリ乳酸-グリコール酸コポリマー又はポリヒドロキシブチレートバレレートコポリマーから選択されており、重量パーセントで、結晶化度が5%以上且つ50%以下であるポリエステルの含量は、10%以上且つ90%以下であることを特徴とする請求項1〜3のいずれか一項に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステルと前記鉄基合金マトリックスの表面との接触方式は、前記分解性ポリエステルが前記鉄基合金マトリックスの表面を被覆する方式、前記鉄基合金マトリックスに隙間又は凹溝が設けられ、前記分解性ポリエステルが前記隙間又は凹溝内に設けられる方式、又は、前記鉄基合金マトリックスが内部空間を有し、前記分解性ポリエステルが前記内部空間内に充填される方式から選択される少なくとも1つであることを特徴とする請求項1に記載の吸収性鉄基合金ステント。
- 前記鉄基合金マトリックスは、純鉄にC、N、O、S、Pの少なくとも1つがドープされて形成された医療用鉄基合金から選択されるものであることを特徴とする請求項1に記載の吸収性鉄基合金ステント。
- 前記鉄基合金マトリックスは、純鉄又は純鉄にMn、Pd、Si、W、Ti、Co、Cr、Cu、Reの少なくとも1つがドープされて形成された医療用鉄基合金から選択されるものであることを特徴とする請求項1に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステルには活性薬物が混合されていることを特徴とする請求項1に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステルの重量平均分子量は2万以上5万未満、5万以上10万未満、10万以上20万未満、20万以上30万未満、30万以上40万未満、40万以上60万未満、又は60万以上且つ100万以下であることを特徴とする請求項1〜3のいずれか一項に記載の吸収性鉄基合金ステント。
- 前記多分散指数は、1.2以上5未満、5以上10未満、10以上20未満、又は20以上且つ30以下であることを特徴とする請求項1〜3のいずれか一項に記載の吸収性鉄基合金ステント。
- 前記分解性ポリエステル類は、エステル基−COO−を含み且つ体内で分解されてカルボキシル基−COOHを生成できるポリマーであることを特徴とする請求項1に記載の吸収性鉄基合金ステント。
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EP3064232A4 (en) | 2017-07-19 |
NZ720002A (en) | 2021-07-30 |
EP3064233A1 (en) | 2016-09-07 |
KR20160094376A (ko) | 2016-08-09 |
US20160263287A1 (en) | 2016-09-15 |
EP3064232B1 (en) | 2020-12-09 |
CN105636618A (zh) | 2016-06-01 |
KR102202431B1 (ko) | 2021-01-12 |
KR20160094375A (ko) | 2016-08-09 |
CN104587534A (zh) | 2015-05-06 |
WO2015062546A1 (zh) | 2015-05-07 |
US20160279303A1 (en) | 2016-09-29 |
US10058639B2 (en) | 2018-08-28 |
EP3064233A4 (en) | 2017-07-19 |
AU2014344308B2 (en) | 2018-07-12 |
AU2014344307A1 (en) | 2016-06-02 |
AU2014344307B2 (en) | 2018-07-12 |
CN105636617A (zh) | 2016-06-01 |
EP3064232A1 (en) | 2016-09-07 |
CN105636618B (zh) | 2018-09-28 |
NZ720013A (en) | 2021-07-30 |
CN109010930B (zh) | 2021-06-11 |
CN109010930A (zh) | 2018-12-18 |
WO2015062547A1 (zh) | 2015-05-07 |
KR102201025B1 (ko) | 2021-01-08 |
EP3064233B1 (en) | 2020-12-09 |
AU2014344308A1 (en) | 2016-06-02 |
JP2016534807A (ja) | 2016-11-10 |
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