JP5059011B2 - 塞栓防止器具 - Google Patents

塞栓防止器具 Download PDF

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JP5059011B2
JP5059011B2 JP2008534709A JP2008534709A JP5059011B2 JP 5059011 B2 JP5059011 B2 JP 5059011B2 JP 2008534709 A JP2008534709 A JP 2008534709A JP 2008534709 A JP2008534709 A JP 2008534709A JP 5059011 B2 JP5059011 B2 JP 5059011B2
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マーク, エー. マグヌソン,
アーマン, エイチ. ヴァライ,
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters 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
    • A61F2/01Filters implantable into blood vessels
    • A61F2/0108Both ends closed, i.e. legs gathered at both ends
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters 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
    • A61F2/01Filters implantable into blood vessels
    • A61F2002/018Filters implantable into blood vessels made from tubes or sheets of material, e.g. by etching or laser-cutting
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0002Two-dimensional shapes, e.g. cross-sections
    • A61F2230/0004Rounded shapes, e.g. with rounded corners
    • A61F2230/0006Rounded shapes, e.g. with rounded corners circular
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2230/00Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2230/0063Three-dimensional shapes
    • A61F2230/0067Three-dimensional shapes conical

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Description

本発明は概ね塞栓防止のための医療器具に関する。
医療技法の継続的な進歩とともに、患者の血管内の狭窄、閉塞、損傷、又は、他の欠陥を積極的に治療するために介入処置(インターベンショナル処置)がより一般的に行われるようになっている。この治療領域は主に、冠状動脈、頸動脈であり、大脳動脈でも行われている。閉塞又は狭窄した血管を治療する一つの処置は、血管形成術である。血管形成術の施術中、拡張バルーンがこの閉塞した領域内に導入される。該バルーンが拡張すると、狭窄した領域の血小板又は他の物質を押圧し、血管の管腔内径を増大させる。該バルーンがこの物質を押圧すると、該物質の一部が血小板堆積物から何かの事情で抜け出ることがある。これらの塞栓は管腔内を移動してより小さな血管内に捕捉され、脳の様な重要臓器への血流を制限することになる。
動脈からの血小板又は血栓を除去する他の方法には、機械的切除、或は光波、音波、超音波、又は他の放射線を使う非接触切除、がある。これらの方法は各々、ある血栓形成物質が血管壁から遊離し、より細い血管を閉塞させる、というリスクを被りやすい。この閉塞は、大脳動脈の虚血性脳梗塞を含む、患者への損傷を引き起こす。
塞栓による損傷のリスクを阻止するために、これまで多くの器具が、塞栓が狭窄した領域から下流へ流れるのを制限するのに使用されてきた。一つの方法には、膨張させ、狭窄した領域の下流の動脈を通る血流を閉塞させる、バルーンを挿入することが含まれる。吸引用カテーテルを該バルーンと狭窄した領域との間に設置して、治療によって引き起こされ得る塞栓を除去するのに使用される。しかしながら、該バルーンは血管を通る血流を完全に塞ぐので、血管は短時間しか閉塞させられない、よって、この処置の使用は制限される。
血管を通る流れを閉塞させる代替として、種々の濾過装置が提案されてきた。このような装置は概ね、塞栓物質を捕捉するものの、血球は流れ得るようになっているレッグ(脚)又はメッシュを形成する要素を有している。この濾過装置で塞栓を捕捉すると、該物質が下流の、より細い血管に引っかかることを阻止することになる。該濾過装置は次に、処置が行われ、塞栓のリスクが減少した後、該塞栓物質と一緒に取り除かれる。
濾過装置には問題点も存在する。一般的に、濾過装置を狭窄部の近位側から展開配備するのが望ましい。従って、該濾過装置の外形は狭窄した血管の開口より小さくなければならない。更に、該濾過装置の外形が小さいほど、該装置の展開配備中に塞栓を除去するリスクが少なくなる。加えて、フィルター部分が血管壁の内側に対して持ちこたえない場合は、塞栓物質が該フィルターと血管壁との間を通過するというリスクがある。展開配備中、医療器具に生じた損傷も塞栓が医療器具を通過してしまうリスクを高めるので、該フィルター部分もまた、耐久性があり、医療器具にしっかりと固定されねばならない。
上記を考慮すると塞栓防止のための改良された医療器具への必要性が在ることは、明らかである。
関連技術における、先に列挙された欠陥や他の限界の幾つか又は全てを、克服又は改善すると同時に、上記の必要性を満たすために、本発明は塞栓防止のための改良した医療器具を提供する。
一実施形態においては、該塞栓防止器具、はコアワイヤとバスケットを含む。該バスケットは、カニューレから形成されるストラットとフィルター部分を含む。該ストラットは該バスケットの第1の端部から該バスケットの第2の端部まで伸張している。該フィルター部分は該ストラットから伸張し、該ストラットと一体に形成される。該フィルター部分は該バスケットの中間部分から該バスケットの第2の端部まで伸張し、血球が通過できるように構成された該カニューレ内に開口を含んでいる。
該フィルター部分は血管の内壁に押し付けられるように、該ストラットは付勢されて拡張状態となる。該コアワイヤは該バスケットの第1の端部と第2の端部の間で伸張し、該ストラットに対して可動であり、該バスケットを収縮状態にする。該ストラットは該カニューレの長さに沿ってレーザー切断スロットにより形成される。該ストラットは付勢されて該コアワイヤから外方向に屈曲し該バスケットに拡張状態を維持させる。従って、該コアワイヤが、該カニューレの近位端に向けて移動すると、該ストラットが該コアワイヤをしっかりと引くので、該バスケットが収縮する。更に、開口のパターンが該カニューレの該ストラットから伸張している部分にレーザーで切り込まれ、該ストラットが該コアワイヤに対して動くにつれて、該フィルター部分が拡張又は収縮するのを可能にする。
もう一つの面においては、管腔内で使用する塞栓防止器具が提供され、該塞栓防止器具はカニューレと、遠位端を有し該カニューレ内で長手方向に伸張するコアワイヤと、カニューレ上の位置と該コアワイヤの遠位端との間で伸張するバスケットと、を備え、該バスケットは該管腔に沿って通過するのに適合した半径方向に折り畳んだ状態と、塞栓を捕捉するのに適合した半径方向に拡張した状態と、の間で可動であり、該バスケットは該コアワイヤの遠位端と前記カニューレ上の位置との長手方向の相対変位を介して、前記圧縮状態と前記拡張状態との間で可動である。
該バスケットは、該バスケットの拡張状態において中空の円錐形を有するフィルター部分を備え、該フィルター部分はその円錐頂部で該コアワイヤの遠位端に接続されていて、該フィルター部分はその円錐基部で前記カニューレ上の位置から長手方向に伸張する複数のストラットに接続されている。該複数のストラットは、協働して該コアワイヤ周りに位置する管状部分を形成するのが好ましい。該複数のストラットは、付勢されて拡張状態になるのが好ましい。
該バスケットは、前記カニューレ上の位置から遠位方向に伸張し、前記カニューレの一部を形成し、該カニューレから材料を取り除くことによって形成される、複数のストラットを備える。該バスケットは、前記カニューレの一部を形成し、該カニューレから材料を取り除くことによって形成される、フィルター部分を備える。
該バスケットは、付勢されて半径方向に拡張した状態になり、該コアワイヤにおける圧縮により半径方向に圧縮された状態で維持されるようにされてもよい。該バスケットの長手方向中間部分は、該バスケットを該管腔内壁に対してシールさせる半径方向力を与えるように構成され、該バスケットが前記圧縮された状態から前記拡張された状態への変形の際、前記中間部分周りに連接するのが好ましい。
本発明のある面の更なる意図、特徴及び利点は、本明細書に付属しその一部を形成する図面と特許請求の範囲を参照して以下の説明を考慮した後、当業者には容易に明らかであろう。
ここで、図1乃至3を参照すると、医療器具10はカニューレ15とコアワイヤ24を含んでいる。カニューレ15はコアワイヤ24の周りに配置され、バスケット12を形成する。バスケット12は、フィルター部分14と複数のストラット16を含んでいる。ストラット16は、バスケット12の第1の端部18と第2の端部20との間で伸張している。フィルター部分14は、ストラット16から伸張し、カニューレ15に複数の開口17を含んでいる。血管内での使用の場合、開口17には、血球の通過は可能だが塞栓物質の環流は阻止できるように、スロットが設けられている。バスケット12は、ストラット16がバスケット12の長手方向軸21に略垂直である中間部分22も含んでいる。中間部分22はフィルター部分14の外縁を血管内側に対して支えている。
カニューレ15は超弾性材料、ステンレス鋼、コバルト−クロム−ニッケル−モリブデン−鉄合金又はコバルト−クロム合金からなる。カニューレ15は、自己開放型又は自己拡張型バスケットとなる、例えば形状記憶合金のような、他のいずれかの適切な材料からも形成され得ることが、分かっている。形状記憶合金は、変態温度より上に過熱されると剛性を有する、即ち、記憶状態に戻るという望ましい特性を有している。本発明に適した形状記憶合金は、ニチノールという名称で知られ、市販されているニッケル−チタンである。この材料が変態温度より上に過熱されると、該材料はマルテンサイトからオーステナイトに相変態を起こし、記憶状態に戻る。この変態温度は、ニッケルとチタンと選択的に含有した合金添加物との、合金成分の相対的比率に依存する。
一実施形態では、ストラット16は人の通常体温、即ち華氏約98.6度(摂氏37度)より僅かに低い変態温度を有する、ニチノールでできている。必ずしも好ましい実施形態ではないが、バスケット12が体内管腔に展開配備され通常の体温に晒されると、ストラット16の合金はオーステナイトに変態するが、このオーステナイトは即ち、記憶状態であり、本発明の一つの実施形態ではバスケット12が体内管腔に展開配備されるときの拡張形状である。バスケット12を取り除くためには、ストラット16を冷やし該材料をオーステナイトより延性のあるマルテンサイトに変態させ、ストラット16をより展性のあるものにする。このようにして、バスケット12はより容易に折り畳まれ、カテーテルのルーメン内に引き入れられ、取り除かれる。
もう一つの代替の実施形態においては、ストラット16は人の通常体温、即ち華氏約98.6度(摂氏37度)より高い温度である変態温度を有するニチノールで出来ている。必ずしも好ましい実施形態ではないが、バスケット12が体内管腔に展開配備され通常体温に晒されると、ストラット16はマルテンサイト状態になるので、バスケット12は十分な延性を有し、所望の形状に曲がるか又は形成し、該形状は本発明では拡張形状となる。バスケット12を取り除くためには、ストラット16を加熱し、該合金をオーステナイトに変態させるとバスケット12は剛性を有し記憶状態に戻り、同状態はこの代替の実施形態のバスケット12では折り畳み形状である。
ストラット16は、バスケット12が塞栓を捕捉するために拡張状態にあるとき、フィルター部分14の開口26を画定する。フィルター部分14はバスケット12の開口26から第2の端部20まで伸張し、近位に向かって凹形を形成する。フィルター部分14の開口26は狭窄病変に面するように構成されている。
フィルター部分14は、バスケット12の拡張と収縮とともに拡張又は収縮するように構成されている。従って、開口17のパターンは、フィルター部分14の拡張を可能にする濾過要素30を形成するカニューレ15に切り込まれるが、そのようなパターンの一例が図2の参照番号28として示されている。図示の如く、濾過要素30は概ね正弦曲線を有している。更に、濾過要素30は、正弦曲線形の列になっていて、該列はフィルター部分14の拡張と収縮を可能にする折り畳み式のパターン28を形成する連結バーで周期的に接続されている。開口17は、血球が通過できる十分な大きさであるが、塞栓物質の通過を阻止するのに十分に小さい。フィルター部分14はストラット16と一体に形成されるニチノールでできているのが好ましい。しかしながら、フィルター部分14は、狭窄病変の処置中、塞栓を捕捉するのに使用されるいずれの適切な材料からなっていてもよい。他の実施形態においては、フィルター部分14は又、本発明の範囲又は精神を越えることなくナイロン、ポリマー材料、テフロン(登録商標)、金属、形状記憶合金、又はこれらの組み合わせで作られていてもよい。
バスケット12は又、バスケット12の第2の端部20から第1の端部18まで通して伸張しているコアワイヤ24も含んでいる。ストラット16が付勢されて拡張状態になり、半径方向への力を提供し、フィルター部分14を該管腔の内壁に抗して支持する。従って、コアワイヤ24はストラット16に対して遠位に動くので、ストラット16はコアワイヤ24に対してしっかりと引かれて、フィルター部分14がストラット16間に折り畳まれる。フィルター部分14をコアワイヤ24に対してしっかりと引き寄せると、医療器具10の直径は挿入に備えて最小化される。
ストラット16は協働して、コアワイヤ24周りに配置されバスケット12の近位に設置される管状部分15を形成する。その結果、管状部分15はコアワイヤ24と摺動可能に係合するルーメンを形成する。バスケット12の第1の端部18で、ストラット16は長手方向軸21とコアワイヤ24に略平行である。ストラット16は第1の端部18と中間部分22との間で互いに螺旋状でかつ放射対称性に伸張している。第1の端部18と中間部分22との間で、ストラット16は滑らかで連続的な移行部を形成するので、ストラット16は長手方向軸21から半径方向に伸張する。バスケット12の中間部分22を越えて、ストラット16はバスケット12の外周部分周りで、長手方向軸21とコアワイヤ24に少なくとも略垂直に伸張している。ストラット16は各々協働して、長手方向軸21に垂直である中間部分22の外周にほぼ沿って円を描く。ストラット16は、関係式d=πD/(2n)に基づく距離だけ長手方向軸21に対して垂直に伸張する。ここで、dはストラット16が長手方向軸21に対して垂直に移動する距離であり、Dは中間部分22の断面直径であり、nはバスケット12を形成しているストラット16の数である。
ストラット16は又、バスケット12の中間部分22と第2の端部20との間でも滑らかで連続的な移行部を形成するので、該ストラットは、中間部分22から長手方向軸21に向かって半径方向に徐々に伸張する。第2の端部20においては、ストラット16は再び長手方向軸21とコアワイヤ24に略平行になる。ストラット16は第2の端部20において、例えばキャップ又は、限定するわけではないが、超音波接合、熱接合、又は接着を含む接着法のようないずれかの適切な手段で、コアワイヤ24に取り付けられる。中間部分22の外見上の円に沿って周囲を移動したその距離は。中間部分22が外周にわたって延びるので、中間部分22による半径方向への力によって、フィルター部分14が管腔内壁に対してしっかりと支持される。
器具10は使用中、折り畳んだ状態から拡張状態に拡張し、該管腔をバスケット12に係合させる。次に、フィルター部分14が開き、狭窄病変の処置中、塞栓を捕捉する。脈管系にこのような器具10の必要性が無くなると、器具10は回収される。
図4Aと図4Bは、本発明の別の実施形態による体内管腔の狭窄病変の処置中において塞栓を捕捉するための塞栓防止アセンブリ40を示している。図示するように、狭窄病変での血管形成術のために、アセンブリ40は管状本体44と、管状本体44に取り付けられ該管状本体と流体連通している拡張可能バルーン46とを有するバルーンカテーテル42を備える。この実施形態では、アセンブリ40は上述した塞栓防止器具を備える。管状本体44は、例えばシリコン又は他のあらゆる適切な材料等、軟質の可撓性材料で作られているのが好ましい。この実施形態では、バルーンカテーテル42は外側ルーメンと内側ルーメンとを含んでいる。該外側ルーメンは、バルーン46を膨らませ、しぼませるために、バルーン46と流体連通している。該内側ルーメンは体内管腔を通って経皮的に誘導するために、該カテーテルを貫通して形成されている。
図の如く、アセンブリ40は遠位端54を有する内側カテーテル52を更に含み、該内側カテーテルを通してバルーンカテーテル42が体内管腔に展開するために配置されている。内側カテーテル52はシリコン又は他のあらゆる適切な材料のような軟質の可撓性材料で作られているのが好ましい。通常、内側カテーテル52は、該カテーテルを通って進められる該塞栓防止器具やバルーンカテーテル42を受けるために、近位端56とプラスチック製のアダプタ又はハブ58とを、更に有している。内側カテーテル52の寸法は、該カテーテルを経皮的に挿入する体内管腔の寸法と、バルーンカテーテル42の寸法と、に基づく。
図の如く、アセンブリ40は、内側カテーテル52を狭窄病変に隣接する位置に案内するために、脈管系内に経皮的に挿入されるように構成されたワイヤガイド60も含んでいてもよい。ワイヤガイド60は体内管腔内に挿入中、内側カテーテル52(及びバルーンカテーテル42)に通路を提供する。ワイヤガイド60の寸法は、内側カテーテル52の内径に基づく。
一つの実施形態においては、バルーンカテーテル42は、狭窄病変の処置中、バルーン46の膨張と収縮のために流体が流れるように、外側ルーメンを介してバルーン46と流体連通する近位流体ハブ62を有する。
図示されるように、体内管腔の狭窄病変の処置に先立って、塞栓防止器具はバルーンカテーテル42の内側ルーメンを通して同軸上に配置される。該遠位防止器具は、該内側ルーメンを通って好ましくはハブ58から遠位方向にバルーンカテーテル42のバルーン46を越えて案内され、内側又はバルーンカテーテル42の遠位端から狭窄病変部位の下流の脈管系内の位置に出る。
本実施形態においては、該器具は、経皮的にワイヤガイド60と内側カテーテル52とを体内管腔に導入するためのポリテトラフルオロエチレン(PTFE)製導入シース64を更に含む。当然ながら、本発明の範囲又は精神を越えることなく他のいずれの適切な材料も使用可能である。導入シース64は、例えば約3フレンチから8フレンチの間の、いずれの適切な寸法を有してもよい。該導入器は、内側及びバルーンカテーテル42を体内管腔の所望の位置に経皮的に導入可能にするように機能する。導入シース64は、内側カテーテル52を受入れ、体内管腔の所望の位置にて該内側カテーテルに安定性を与える。例えば、内側カテーテル52が導入シース64を通して脈管系の拡張領域に進められるとき、導入シース64は、総内臓動脈内で静止状態に保持され、内側カテーテル52に安定性を加える。
内側カテーテル52の遠位端54が体内管腔の拡張領域の下流に位置しているとき、バルーンカテーテル42が該内側カテーテルを通して該拡張領域に挿入される。その後器具10をバルーンカテーテル42の近位端に装填し、該バルーンカテーテルの内側ルーメンを通して進ませ、その遠位端を通して展開配備する。この実施形態においては、該近位ステムは、該カテーテルを通して器具10を機械的に進ませる又は押すために使用される。
次に図5を参照すると、図5は、医療器具10の挿入を示している管腔70の断面図である。医療器具10は、バスケット12が折り畳まれた状態で挿入されるので、医療器具10が狭窄領域72が形成した狭い開口を通って進むのを可能にする。従って、挿入中、医療器具10の外形は最小になる。よって、コアワイヤ24をストラット16に対して遠位に動かし、ストラット16とフィルター部分14をコアワイヤ24に対してしっかりと引き寄せ、それによって折り畳んだ状態を形成する。医療器具10は、遠位方向を示す矢印74が示すように、管腔70内へ狭窄72を越えて挿入される。
ひとたび医療器具10のバスケット部分12が狭窄72の遠位に位置すると、図6に示すように、バスケット部分12が血管70の内壁に対して拡張可能となる。拡張状態において、ストラット16はフィルター部分14に対して半径方向への力を与え、フィルター部分14を管腔70の内壁に対して固定する。該半径方向への力は、フィルター部分14と管腔70との間の隙間を無くし、狭窄72から剥がれた塞栓物質がフィルター部分14内の下流で捕捉されるようにする。狭窄72に対する処置がなされた後、コアワイヤ24をストラット16に対して遠位に動かし、図7に示すようにストラット16とフィルター部分14とをコアワイヤ24に対してしっかりと折り畳む。折り畳んだ状態では、該塞栓物質はフィルター部分14内でコアワイヤ24に対して捕捉されている。しかしながら、取り外し中における予防手段として、カテーテルも医療器具10上を摺動してもよい。折り畳まれた状態にある医療器具10は、その後、近位方向を示す矢印76で示すように近位方向に取り外される。
次に図8を参照すると、医療器具10は、挿入中に付加的な誘導を提供するために、バスケット12の第2の端部20の遠位に設置する柔軟な先端80を含んでいてもよい。柔軟な先端80は第2の端部20から伸張し、該医療器具が挿入中血管の狭窄領域へ又は狭窄領域を通って容易に前進できるように親水性皮膜又は他の潤滑性皮膜を有していてもよい。柔軟な先端80は、例えば接着によって第2の端部20に取り付けられ、ナイロン、ポリマー材料、シリコン、テフロン(登録商標)、又は本発明の範囲又は精神を越えることなく他の通常知られた材料から出来ている。該柔軟な先端が提供する可撓性は、該医療器具が該管腔を通って前進するのを助け、一方ではその前進中引き起こされるいずれの外傷も最小にする。
次に図9を参照すると、本発明に基づく医療器具の別の実施形態が提供されている。管状部材90が、バスケット部分12の第2の端部20から遠位に伸張する先端92に設けられている。管状部材90は、ナイロン、ポリマー材料、テフロン(登録商標)、又は本発明の範囲又は精神を越えることなく、他の通常知られた材料で出来ている。管状部材90は、第1の開口94と第2の開口96とを含み、ワイヤガイド98は管状部材90の第1の開口94と第2の開口96を通って伸張している。従って、管状部材90により、挿入中、医療器具10がワイヤガイド98に沿って誘導されるのを可能にし、又は代替としてワイヤガイド98が医療器具10と共に前進するのを可能にする。
当業者は容易に理解するように、上記の説明は本発明の原則の実施の例示である。本発明の精神から離れることなく、以下の特許請求の範囲に画定されるように、本発明は変更、変形及び変化が可能であるから、上記記述は本発明の範囲又は用途を限定するものではない。
本発明による医療器具の側面図である。 カニューレ内に切り込まれた、拡張可能パターンの開口の、詳細図である。 図1の医療器具の斜視図である。 本発明の一実施形態による狭窄病変の処置中において、塞栓を捕捉するための塞栓防止アセンブリの側面図である。 図4Aのアセンブリの分解側面図である。 図1の医療器具の挿入を示す、血管の断面図である。 図1の医療器具が十分に展開した状態を示す、血管の断面図である。 血管から医療器具を取り除く状態を示す、血管の断面図である。 柔軟な先端を含む、本発明の別の実施形態の側面図である。 ガイドワイヤアダプターを含む、本発明の更に別の実施形態の側面図である。

Claims (10)

  1. コアワイヤと、
    該コアワイヤに取り付けられ、該コアワイヤ周りで該コアワイヤの長手方向に伸張するカニューレであって、該カニューレは当該カニューレ自体に形成されて該長手方向で間隔をあけた近位端部及び遠位端部を有するバスケット部分を有し、該バスケット部分は複数のストラットとフィルター部分とを含み、該フィルター部分が該近位端部及び遠位端部間の中間位置と該遠位端部との間に延びるように設けられており、該ストラットは該近位端部及び遠位端部の間に延び、該バスケット部分は該近位端部が該コアワイヤに沿って該遠位端部に対して相対的に近づいたり離れたりすることにより拡張状態と収縮状態との間で可動であり、該ストラットのそれぞれは該バスケット部分が拡張状態とされたときに該中間位置において該コアワイヤの周囲を囲うように延びて、当該コアワイヤの側面視で、該コアワイヤに対して直交する方向に延びる中間部分を有し、該フィルター部分が、該側面視で、各ストラットの該中間部分から該遠位端部まで延びる部分から延びる横列をなす正弦曲線形状で該長手方向において相互に間隔をあけた複数の濾過要素と、該長手方向で隣接する該濾過要素を当該コアワイヤの周方向で相互に開けた位置で連結し、濾過要素と協働して当該フィルター部分に複数の開口を形成する連結要素とを有し、該バスケット部分が該拡張状態及び収縮状態間で動くときに該濾過要素が該コアワイヤの周方向で拡張及び収縮するようにされ、
    該拡張状態では該フィルター部分が該コアワイヤの周りにバスケット状のフィルターを形成するようにされた、カニューレと、
    を備える管腔内で使用する塞栓防止器具。
  2. 該複数のストラットが協働して該バスケット部分の遠位にある該コアワイヤ周りに設けられた管状部分を形成する、請求項1に記載した塞栓防止器具。
  3. 該複数のストラットは、該バスケット部分が該拡張状態となるように、付勢されている、請求項1または請求項2に記載した塞栓防止器具。
  4. 遠位の端部に取り付けた柔軟な先端を更に備える、請求項1乃至3のうちいずれかに記載した塞栓防止器具。
  5. 遠位の端部に取り付けた管状部分を更に備え、該管状部分が該管状部分を通してワイヤガイドを受けるように構成されている、請求項1乃至4のうちいずれかに記載した塞栓防止器具。
  6. 該複数のストラットが該バスケット部分近位の端部と中間部分との間で螺旋状に伸張している、請求項1乃至5のうちいずれかに記載した塞栓防止器具。
  7. 複数のストラットが該バスケット部分近位の端部と遠位の端部の間で螺旋状に伸張している、請求項1乃至5のうちいずれかに記載した塞栓防止器具。
  8. 該カニューレが形状記憶材料から形成される、請求項1乃至7のうちいずれかに記載した塞栓防止器具。
  9. ストラットの中間部分が、該フィルター部分を該体内管腔内壁に対して密着させる半径方向への力を与えるように構成されている請求項1乃至8のうちの何れかに記載した塞栓防止器具。
  10. 体内管腔の狭窄病変の処置中において塞栓を捕捉するための塞栓防止アセンブリであって、
    狭窄病変での血管形成術のために、管状本体部と、該管状本体に取り付けられ該管状本体部と流体連通している拡張可能バルーンであって、近位部と遠位部を備える該拡張可能バルーンを有するバルーンカテーテル、及び、
    該バルーンカルーテル内に同軸上に配置された請求項1乃至9のうちいずれかに記載した塞栓防止器具
    を備えるアセンブリ。
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KR20210089384A (ko) * 2020-01-08 2021-07-16 경일대학교산학협력단 혈관계 질환의 진단 및 치료가 가능한 카테터
KR102358005B1 (ko) 2020-01-08 2022-02-03 경일대학교산학협력단 혈관계 질환의 진단 및 치료가 가능한 카테터

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EP1931279B1 (en) 2017-12-13
WO2007041711A1 (en) 2007-04-12
US8182508B2 (en) 2012-05-22
AU2006299337B2 (en) 2012-02-02
EP1931279A1 (en) 2008-06-18
JP2009509719A (ja) 2009-03-12
US20070078481A1 (en) 2007-04-05

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