JP6689605B2 - 医療用管状体 - Google Patents
医療用管状体 Download PDFInfo
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- JP6689605B2 JP6689605B2 JP2015512338A JP2015512338A JP6689605B2 JP 6689605 B2 JP6689605 B2 JP 6689605B2 JP 2015512338 A JP2015512338 A JP 2015512338A JP 2015512338 A JP2015512338 A JP 2015512338A JP 6689605 B2 JP6689605 B2 JP 6689605B2
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
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Description
本発明は、X線透視下での視認性、カテーテル内への挿入性、カテーテル内での摺動性に優れ、縮径状態でマーカーと管状体または隣接するマーカーどうしの接触を抑制でき、一層小さく縮径することのできる医療用管状体を提供することを目的とする。
医療用管状体は、生体内管腔内で用いられるものであり、例えば生体内管腔の病変部に留置して生体内管腔の径を維持ないし拡張するためのステントや、生体内管腔に形成された血栓を除去するための血栓回収デバイス、あるいは末梢保護フィルターなどの末梢保護デバイス等が挙げられる。
医療用管状体には、例えば、(i)1本の線状の金属もしくは高分子材料からなるコイル状のタイプ、(ii)金属チューブをレーザーなどで切り抜き加工したタイプ、(iii)線状の部位を溶接し組み立てたタイプ、(iv)複数の線状金属を織って作ったタイプ等がある。
管状体は、例えばメッシュなどの網目構造で構成されている拡径可能な構造体である。本発明において拡径可能とは、管状体の長軸に垂直な方向(径方向)に伸張することができ、径が伸張された状態からは逆に収縮(縮径)することもできることを意味する。管状体は、例えば周方向および軸方向に伸縮する、相互に連結している構造要素のパターンから形成される。本発明において管状体は、任意のパターンに適用可能であり、したがって、いかなる特定のステントの形状あるいは構造要素のパターンにも限定されない。
医療用管状体をひとたび体内に入れると、その位置を目視で確認することはできない。そのため、X線透視下において医療用管状体を観察できるよう、X線不透過材料を含むマーカーが医療用管状体の所定位置に設けられる。マーカーは、X線を完全に遮断するものでなくてもよく、X線透視下においてマーカーの存在が検知できる程度のX線透過率を有していればよい。
以下、本発明の実施の形態1にかかる医療用管状体について、図面を用いて説明する。図1は、本発明の実施の形態1にかかる医療用管状体の展開図である。医療用管状体100は、遠位端101、近位端102を有し、遠位端101と近位端102の間には金属メッシュ部111を有している。金属メッシュ部111は、連続したセル112の組み合わせにより構成されている。金属メッシュ部111は、長手方向を中心軸として管状に曲げられ、金属メッシュ部111の2つの長辺どうしが接合されることにより管状体として構成される。これについては、図9(a)、図12(a)が参考となる。
以下、本発明の実施の形態2にかかる医療用管状体について、図面を用いて説明する。図4は、本発明の実施の形態2にかかる医療用管状体の展開図である。医療用管状体100は、遠位端101、近位端102を有し、遠位端101と近位端102の間には金属メッシュ部111を有している。本発明の実施の形態2にかかる医療用管状体100は、基本的には、本発明の実施の形態1にかかる医療用管状体100と同様の構成を有しているため、同じ構成には同じ符号を付してその説明を省略する。
以下、本発明の実施の形態3にかかる医療用管状体について、図面を用いて説明する。図6は、本発明の実施の形態3にかかる医療用管状体の展開図である。医療用管状体100は、遠位端101、近位端102を有し、遠位端101と近位端102の間には金属メッシュ部111を有している。本発明の実施の形態3にかかる医療用管状体100は、基本的には、本発明の実施の形態2にかかる医療用管状体100と同様の構成を有しているため、同じ構成には同じ符号を付してその説明を省略する。
以下、本発明の実施の形態4にかかる医療用管状体について、図面を用いて説明する。図8は、本発明の実施の形態4にかかる医療用管状体の展開図である。医療用管状体100は、遠位端101、近位端102を有し、遠位端101と近位端102の間には金属メッシュ部111を有している。金属メッシュ部111は、螺旋方向に連続したセル112の組み合わせにより構成されている。本発明の実施の形態4にかかる医療用管状体100は、基本的には、本発明の実施の形態3にかかる医療用管状体100と同様の構成を有しているため、同じ構成には同じ符号を付してその説明を省略する。
以下、本発明の実施の形態5にかかる医療用管状体について、図面を用いて説明する。図11は、本発明の実施の形態5にかかる医療用管状体の展開図である。図12(a)は、実施の形態5にかかる医療用管状体(拡径時)の遠位端101付近の斜視図であり、(b)は、その遠位端101を軸方向から見た図である。また図13(a)は、実施の形態5にかかる医療用管状体(縮径時)の遠位端101付近の斜視図であり、(b)は、その遠位端101を軸方向から見た図である。
101 遠位端
102 近位端
111 金属メッシュ部
112 セル
121,122,123,124 マーカー
131,132,133,134 マーカーハウジング
141 マーカーハウジングの内側面
151,152,153,154 支柱
Claims (16)
- 拡径可能な管状体と、前記管状体の内側に形成され、前記管状体よりも外側には形成されていない少なくとも2つのマーカーとを有し、
前記2つのマーカーが、前記管状体の周方向の異なる位置に形成されており、
縮径時の前記管状体を前記管状体の長手軸方向から見たときに、前記2つのマーカーの少なくとも一部が重なっていることを特徴とする医療用管状体。 - 前記2つのマーカーが、前記長手軸方向の異なる位置に形成されている請求項1に記載の医療用管状体。
- 縮径時の前記管状体を前記長手軸方向に対して垂直な方向から見たときに、前記2つのマーカーのうち少なくとも1つが前記長手軸方向において前記管状体から延びている請求項1または2に記載の医療用管状体。
- 前記マーカーは、前記管状体の内側面に固定されている請求項1〜3のいずれかに記載の医療用管状体。
- 前記マーカーは、前記管状体の一部を構成する非変形部に形成されている請求項1〜4のいずれかに記載の医療用管状体。
- 前記マーカーは、前記管状体の内側面の平面部に形成されている請求項1〜5のいずれかに記載の医療用管状体。
- 前記マーカーは、前記管状体の内側面に溶接されている請求項1〜6のいずれかに記載の医療用管状体。
- 前記マーカーは、前記管状体の縮径時の内側空隙に収容される大きさである請求項1〜7のいずれかに記載の医療用管状体。
- 前記マーカーは、前記管状体の縮径時に前記マーカーどうしが互いに接触しない大きさを有している請求項1〜8のいずれかに記載の医療用管状体。
- 前記管状体は長さの異なる複数の支柱を含んでおり、各支柱の端部に前記マーカーが形成されている請求項1〜9のいずれかに記載の医療用管状体。
- 前記管状体の縮径時において、前記マーカーの一方端は前記管状体との間に空隙を形成している請求項1〜10のいずれかに記載の医療用管状体。
- 前記マーカーは、前記管状体の径方向の長さよりも、前記管状体の前記長手軸方向の長さのほうが長い請求項1〜11のいずれかに記載の医療用管状体。
- 自己拡張型である請求項1〜12のいずれかに記載の医療用管状体。
- 前記管状体は網目構造を有しており、該網目構造は、螺旋方向に連続したセルの組み合わせにより構成されている請求項1〜13のいずれかに記載の医療用管状体。
- 前記マーカーは、柱状である請求項1〜14のいずれかに記載の医療用管状体。
- 血栓を除去する血栓回収デバイスである請求項1〜15のいずれかに記載の医療用管状体。
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PCT/JP2014/054563 WO2014171184A1 (ja) | 2013-04-16 | 2014-02-25 | 医療用管状体 |
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