JP5252773B2 - 静脈フィルタ - Google Patents
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- JP5252773B2 JP5252773B2 JP2005231308A JP2005231308A JP5252773B2 JP 5252773 B2 JP5252773 B2 JP 5252773B2 JP 2005231308 A JP2005231308 A JP 2005231308A JP 2005231308 A JP2005231308 A JP 2005231308A JP 5252773 B2 JP5252773 B2 JP 5252773B2
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Description
本出願は、血管内フィルタ、詳細には管内の血栓を捕捉するための静脈フィルタに関する。
いくつかの事例では、血液の抗凝固薬、例えば、ヘパリン又はワルファリン・ナトリウムのような抗凝血薬を患者に投与することができる。しかし、このような薬物は、手術又は発作後の患者に投与すること、又は内出血の危険性の高い患者に与えることはできない場合があるので使用が制限されている。また、この薬物療法が、血栓の再発防止に必ずしも有効であるとは限らない。
一時的であるフィルタは、通常は、フィルタを回収鞘に引き入れる回収係蹄によって取り除かれる。係蹄による把持を容易にし、並びに回収鞘内への滑らかな移行をもたらすことにより引き抜きを容易にするフィルタを提供することが有利であると考えられる。
一実施形態では、結合ストラットの各々は、第1の領域のストラットを実質的に等しい2つの結合ストラットに分割することによって形成され、この結合ストラットは、接合して第2の領域を通って延びる伸長ストラットへ移行する。一実施形態では、隣接するストラットの結合ストラットは、中間領域で接合し、更に互いに離れるように延びて別の結合ストラットと接合し、第2の組の閉じた幾何学形状を形成する。
フィルタは、レーザカットチューブから形成されるのが好ましく、形状記憶材料から成るのが好ましい。
一実施形態では、結合ストラットは、接合領域で接合され、伸長取付ストラットは、第2の領域を通って接合領域から延びる。
取付部分は、フィルタの保持を強化させるためにフックの形態の血管係合部材を含むことが好ましい。一実施形態では、血管係合部材は、第1の組のフックと第2の組のフックを含み、各組のフックは、取付部分の端部又は第2の終端部に位置決めされ、第1の組のフックは、第2の組のフックの横方向寸法よりも大きな横方向寸法を有する。一実施形態では、第1の組のフックは、第2の組のフックから軸線方向にずれており、第2の組の各フックは、第2の組の他のフックに対して軸線方向にずれている。
好ましくは、フィルタは、第2の端部において、隣接する結合取付ストラットが接合する領域から延びる血管係合部分を含む。好ましくは、第1の領域は、回収鞘の一部分を受けるような寸法にされた環状内面を露出する切り欠きを有するフックを含む回収領域を更に含む。
切断されたチューブは、好ましくは、環状内面を露出する切り欠きを有するフックを含む回収領域と、取付領域に血管係合フックとを更に含む。
好ましい実施形態では、上述のフィルタは、形状記憶材料から成るレーザカットチューブから形成される。
本開示の好ましい実施形態をここで図面を参照して説明する。
フィルタは、送出鞘を通しての挿入を容易にする扁平の折り畳まれた構成から、血管壁と非外傷的に係合して下大静脈内にフィルタを固定(取り付け)することができるようにする大きく拡張された配置構成へ移動可能である。フィルタは、実質的にベル形であるのが好ましく、張り出し領域又は取付領域(部分/区域)及びフィルタ領域(部分/区域)を有するのが好ましい。以下により詳細に示すように、フィルタ部分は、内方に向うストラットを有し、収束領域で終端し、それによって粒子をフィルタの中心軸線へ向ける。粒子を中央に向けることにより、粒子の溶解を向上させるより強い血流に曝すことになるであろう。他の部分は、横方向寸法が増大して張り出し領域を形成する。張り出しは、直線的な領域よりも接触面積が少なく、内に伸びる組織が少ないために、必要な場合にフィルタの取り外しを容易にする。張り出しはまた、湾曲した静脈に挿入される場合の管の捩れを起こりにくくする。
上述のフック172、182、192、302(並びに以下に示すフック)は、開示された実施形態のいずれでも使用することができる(図11Gの例を参照)。このようなフックはまた、全てのストラットよりも少なく形成又は設けることが可能である。
図示の実施形態における縦方向の、傾斜した、曲がった、湾曲した、結合した、接合した、相互結合した、結合ストラットなどの呼称は、同じ一体的なストラットに言及しており、理解を容易にするためにこのような領域に分割されたものである。
フィルタ10(及び、本明細書に説明した他のフィルタ)は、患者の首にある頚静脈から又は患者の足にある大腿静脈又は腕から挿入することができる。フィルタはまた、上大静脈に配置することができる。
フィルタ110の折り畳まれた構成は、切り欠き112が6つのストラット114を形成するように図9に示されている。領域113は、ストラット114が2つに分かれるところを示している。
別の実施形態では、リブは、先端付近で半径方向外側に湾曲し、従って、血管壁に接触して保持機構として作用することができる。
ストラット部分714cは、図11Dのフック302a及び302bと同様のフック740a及び740bで終端することが好ましい。つまり、フック740a及び740bは、ストラット714cの平面内にあり、フック740aは、フック740bよりも大きく、2つの隣接するストラットの横方向寸法に等しい領域を占めるように形成されている。小さいフック740bは、フック302a及び302bに関連して上述したように大きいフック740a内に収まっている。図20Fにおいて、フックがチューブから形成されているために理解し易いように表された展開図中で3つの異なる距離E1、E2、及びE3を示す矢印で表されるように、小さいフック740bは、フック740aから軸線方向(内方)に間隔を置くと同時に、互いに対して軸線方向に間隔を置いていることに注意されたい。本明細書に説明した様々なフックの実施形態を含み、他のフックの設計形状を代わりに設けることができるであろう。
管状部分718は、好ましくは、他の実施形態に関して本明細書に説明したような回収フックの形態であり、好ましくは、図13Fの回収フック290の形態である。他の回収構造もまた、利用することができる。
取付部分821におけるストラット814の終端部に保持フックが設けられる。図示のように、フック840a及び840bは、図20のフック740a及び740bと同じであることが好ましい。フィルタ800のフィルタ端部の管状端部818における回収フック850は、フィルタ700の回収フック750と同じであることが好ましい。他のフックの設計形状及び回収構造を代わりに利用することもできる。
管状部分918は、他の実施形態に関して本明細書に説明したような回収フック950の形態であることが好ましく、また、図13Fの回収フック290の形態であることが好ましい。他の回収構造もまた利用することができる。
フックは、表面294と同様に機能するための、すなわち、係蹄チューブを受けるための内部環状表面を設ける他の方法で形成することができることを認めるべきである。
回収フックのいずれも本明細書で説明したフィルタのいずれかと共に使用することができることを認めるべきである。
11 チューブ
12 切り欠き
Claims (9)
- 第1の領域及び第2の領域を含み、
血管へ送出するための折り畳まれた位置と血管内に配置するための拡張された位置との間で移動可能であり、
前記第1の領域は、粒子をフィルタの中心の方向へ向けるための収束領域を有するフィルタ部分を有し、
前記第1の領域はまた、複数の離間したフィルタストラットと、該フィルタストラットからある一定角度で延びて、隣接するフィルタストラットに接合する結合フィルタストラットとを含み、
前記収束領域から延びる前記第1の領域の複数の離間したフィルタストラットは、最初フィルタの縦軸線に実質的に沿って延びており、
前記第2の領域は、前記拡張された位置において、前記フィルタ部分と反対側の第2の端部に向けて増大する横方向寸法を有し、
前記第2の領域はまた、複数の離間した取付ストラットと、該取付ストラットからある一定角度で延びて、隣接する取付ストラットに接合する結合取付ストラットとを含み、
前記フィルタストラットは前記第1の領域で分かれてより小さい幅を有する前記結合フィルタストラットを形成し、次いで、該結合フィルタストラットは隣接する結合フィルタストラットと接合して長手方向に延びて前記取付ストラットを形成し、前記取付ストラットは前記第2の領域で分かれてより小さい幅を有する前記結合取付ストラットを形成し、次いで、該結合取付ストラットは隣接する結合取付ストラットと再び接合して血管係合部分へ延びる、
ことを特徴とする血管フィルタ。 - 前記第1の領域は、回収領域を更に含み、
前記回収領域は、環状内面を露出する切り欠きを有するフックを含み、
前記環状面は、回収鞘の一部分を受ける寸法を有する、
ことを特徴とする請求項1に記載の血管フィルタ。 - 前記回収領域は、遠位側に内方に延びる第1及び第2の曲面を有する丸みを付けた領域を含むことを特徴とする請求項2に記載の血管フィルタ。
- 前記回収領域は、その近位端にフックと該フックから軸線方向に離間した湾曲壁とを更に含み、回収鞘内に入り易くするためのカム結合表面を形成することを特徴とする請求項2に記載の血管フィルタ。
- ストラットを作り出すために切断される単一チューブから製造された本体を含むことを特徴とする請求項1に記載の血管フィルタ。
- 前記切断されたチューブは、前記取付領域において血管係合フックを含むことを特徴とする請求項5に記載の血管フィルタ。
- レーザカットチューブから形成され、形状記憶材料から成ることを特徴とする請求項1に記載の血管フィルタ。
- 前記ストラットの1つ又はそれ以上は、血管係合フックで終端することを特徴とする請求項1に記載の血管フィルタ。
- 前記フックは、第1の組のフック及び第2の組のフックを含み、
前記第1の組のフックは、前記第2の組のフックの横方向寸法よりも大きな横方向寸法を有し、かつ該第2の組のフックから軸線方向外方にずれている、
ことを特徴とする請求項8に記載の血管フィルタ。
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2004
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- 2005-07-11 ES ES05014948T patent/ES2315759T3/es active Active
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- 2005-07-12 JP JP2005231308A patent/JP5252773B2/ja active Active
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US20080097518A1 (en) | 2008-04-24 |
US20160045298A1 (en) | 2016-02-18 |
JP5706459B2 (ja) | 2015-04-22 |
US8366736B2 (en) | 2013-02-05 |
US9168121B2 (en) | 2015-10-27 |
ES2315759T3 (es) | 2009-04-01 |
DE602005010330D1 (de) | 2008-11-27 |
US9763766B2 (en) | 2017-09-19 |
EP1616530A1 (en) | 2006-01-18 |
US7704266B2 (en) | 2010-04-27 |
JP2013128789A (ja) | 2013-07-04 |
JP2006026423A (ja) | 2006-02-02 |
US20130178890A1 (en) | 2013-07-11 |
EP1616530B1 (en) | 2008-10-15 |
US20050165442A1 (en) | 2005-07-28 |
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