JP2003524504A - 移植可能な人工心臓弁の固定システム - Google Patents

移植可能な人工心臓弁の固定システム

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JP2003524504A
JP2003524504A JP2001563037A JP2001563037A JP2003524504A JP 2003524504 A JP2003524504 A JP 2003524504A JP 2001563037 A JP2001563037 A JP 2001563037A JP 2001563037 A JP2001563037 A JP 2001563037A JP 2003524504 A JP2003524504 A JP 2003524504A
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hook
heart valve
fixation system
artificial heart
ridge
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JP4246433B2 (ja
Inventor
クリストフ ダンム
カルステン ヴェーベル
ステファン リッゼ
フォルケル グイェノット
マッチアス モハォプト
ゲルト ハルニシュ
ペギー デルエル
マルクス フェラーリ
クラオス ランク
ハンス−ライネル フィグーラ
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フラウンホーファー−ゲゼルシャフト ツール フエルデルング デア アンゲヴァンテン フォルシュング エー.ファオ.
マルクス フェラーリ
クラオス ランク
ハンス−ライネル フィグーラ
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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
    • A61F2/02Prostheses implantable into the body
    • A61F2/24Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
    • A61F2/2412Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body with soft flexible valve members, e.g. tissue valves shaped like natural valves
    • A61F2/2418Scaffolds therefor, e.g. support stents
    • 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0008Fixation appliances for connecting prostheses to the body
    • 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
    • A61F2220/00Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2220/0008Fixation appliances for connecting prostheses to the body
    • A61F2220/0016Fixation appliances for connecting prostheses to the body with sharp anchoring protrusions, e.g. barbs, pins, spikes

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)

Abstract

(57)【要約】 本発明は、大きな外科手術をすることなしに、大動脈を介した導入により移植され得る人工心臓弁の固定システムに関する。本発明の人工心臓弁によれば、この人工心臓弁を大動脈を通じて安全かつ迅速に心臓の方向に導き、そこに固定することができる。これにより、フック型要素のフックは人工心臓弁材料の外側の方向に導かれ、フック型要素は人工心臓弁の交連に固定される。

Description

【発明の詳細な説明】
【0001】
【発明の属する技術分野】
本発明は、人工心臓弁の固定システムに関する。従来の方法では、胸郭を完全
に開くことが必要であったが、本発明の人工心臓弁は、大きな外科手術をするこ
となく、導入のために大動脈を介して移植可能である。
【0002】 過去においても、最も異なる試みが行われ、解決方法が与えられた。ここでは
、人工心臓弁を大動脈を通じて心臓に導き、展開して引き伸ばす操作の後にそこ
に固定するように移植していた。
【0003】 米国特許5,855,601号には、人工心臓弁が固定され得るステント(st
ent)と呼ばれるものが記載されている。このステントは、本質的に、ワイヤ型
の形状記憶合金(金属)から構成され、格子構造内の円筒構造で表される。この
形状記憶合金は、37℃より低い温度で折り畳むことができ、カテーテルを用い
て大動脈を介して心臓に導入される。そこで、冷却システムのスイッチが切られ
、温度が約37℃になると、記憶した形状をとり、それぞれ展開した状態で、大
動脈壁内側にしっかりとフィットする。
【0004】 しかし、形状記憶合金の限界により、大動脈中で問題なく導くために、また展
開した状態のとき、大動脈の内側にしっかりとフィットして安全に支持されるよ
うな寸法にするために、このようなステントを小さくして折り畳むのは今のとこ
ろ困難である。
【0005】 さらに、このような方法で構成および設計され、かつ要求される温度範囲で適
切な従来の形状記憶合金(たとえばニチノール:ニッケルとチタンの合金)から
構成された固定支持体を製造するには、問題があり、不当な高い製造費が必要と
なる。このようなボディは、たいてい、レーザービーム切断により固体材料を切
断したものだからである。
【0006】 そのため、本発明の目的は、人工心臓弁が大動脈を介して心臓に導入され、そ
こに固定される可能性を提案することである。
【0007】 本発明によれば、この目的は請求項1の特徴により解決される。従属項に記載
された特徴から、本発明のより好ましい実施の形態および改良が得られる。
【0008】 本発明によれば、たとえば豚の心臓から得ることのできる生化学的な人工心臓
弁の交連(commissures)、または人造の人工心臓弁に直接フック型要素が取り
付けられる。これらのフックは、それぞれ、人工心臓弁材料を通して外側の方向
に導かれ、移植された状態では大動脈壁内に突き通されて大動脈壁を貫き、これ
により人工心臓弁を大動脈壁に安全に固定することができる。
【0009】 さらに、付加的なフック型要素を人工心臓弁の外輪に取り付けることができる
【0010】 その場合、フック型要素は人工心臓弁に縫いつけることができる。
【0011】 しかし、フック型要素を内側から人工心臓弁に導入し、少なくともフックが人
工心臓弁材料を突き通すようにすれば、よりシンプルでより容量を小さくするこ
とができる。フック型要素はリッジまたはベース要素上に形成するのが適当で、
フック型要素のフックだけが人工心臓弁から突出し、それぞれ個々の大きさの残
りの部分は人工心臓弁内に保持されるようにすることができる。
【0012】 そのため、たとえば、リッジはそれぞれ平坦な棒状や長い板状に形成され、そ
の上に少なくとも二つのフック型要素を設計することができる。
【0013】 たとえば、ベース要素は、環状の板型に設計することができる。ここで、環の
断面領域により人工心臓弁材料に孔が空くのを避けることができる。
【0014】 リッジおよびベース要素上に配置されたフック型要素は、それぞれ、実質的に
ピン型に形成することができる。その場合、大動脈壁内で固定するための一つま
たは複数の突起(かぎ)がピン型部分に形成され、その突起は大動脈壁に押し入
れられた後にその中または後ろで大動脈壁に連結する。
【0015】 その場合、突起の形状は、転移温度以上でのみ、その突起が外側に突出するよ
うに形状記憶合金に記憶され、そのため、大動脈壁への切り込みと貫通を容易に
行うことができる。
【0016】 その上にフック型要素が形成されまたは固定されたリッジが用いられる場合、
これらのリッジは、移植された状態で、大動脈の長軸方向に整列するようにして
人工心臓弁の交連に固定することができる。
【0017】 しかし、リッジをらせん状に設計しても特に有利である。らせん形状であるた
めに、これらのリッジが大動脈の内部の輪郭に適合するからである。さらに、ら
せん形状であるために、大動脈の内壁の多くの領域を覆うことができ、厳密さの
度合いが増し、リッジはフックにより大動脈に直接しっかりフィットする。
【0018】 ベース要素とともに、互いに分離された個々のフック型要素が用いられた場合
、これらは分散された状態で交連上に配置され、らせん形状の輪郭または2つの
逆方向に屈曲したスパイラル形状の輪郭とすることができる。
【0019】 フック型要素を持つリッジが用いられた場合、これらのリッジは、少なくとも
人工心臓弁の交連の長さと同じ長さを有することができる。
【0020】 異なる交連に固定されたリッジは互いに接続されない。
【0021】 固定システムが取り付けられた人工心臓弁を導入するために、少なくともフッ
ク型要素は形状記憶合金により構成するのが好ましい。形状記憶合金は、導入段
階ではフック型要素が平らに位置し、導入の抵抗および容量を小さくし、移植の
段階でのみ所望の形状でフックを立てて大動脈壁に固定するようにする。
【0022】 フック型要素の有効な高さは、少なくとも2mmとすることができ、この高さ
で、フック型要素がそれぞれ人工心臓弁から突出して大動脈壁内に突き通り、貫
く。
【0023】 さらに、様々なフック型要素を種々の方向に曲げるのが好ましい。これにより
、大動脈の内部の状態や心臓付近の血圧や流量の状態をも考慮すると、本発明の
固定システムの確実な固定を得ることができる。
【0024】 より好ましくは、隣接するフック型要素は、互いに向き合うように折り曲げら
れ、形状記憶合金を用いて、このような位置が記憶される。これにより、転移温
度に届き転移温度を超えたときに、それぞれ大動脈壁内で隣接するフック型要素
の締め付けがおこる。
【0025】 さらに、人工心臓弁外輪の領域で、人工心臓弁の内側に、付加的な環状部材が
固定され得る。これも、大動脈を介した導入段階では抑えられ、より小さい容量
を必要とする。この部材としては、たとえば適切なプラスチックまたはゴムなど
のエラストマー材料が場合によりらせん状の弾性体とともに、またはらせん状の
弾性体だけ、または形状記憶合金を用いることができる。
【0026】 本発明の固定システムとともに提供される人工心臓弁は、対応するメカニズム
が形成されたカテーテルの手法で大動脈に導入され得る。ここで、このメカニズ
ムは、人工心臓弁を展開し、所望の位置に配置された人工心臓弁をはずすように
できる。
【0027】 また、バルーンカテーテルを用いることもできる。この場合、本発明の固定シ
ステムとともに提供される人工心臓弁は、ぽんと放り出され、大動脈中のこの位
置に導入される。移植する位置に届くとバルーンが加圧され、人工心臓弁は、大
動脈壁に逆らってフック型要素とともに押され、それからフックが大動脈壁の内
側に固定される。ここで、形状記憶合金を用いる場合、バルーンカテーテルは必
要とされる冷却にも用いることができる。
【0028】 このようなカテーテルのバルーンの表面は、たとえば、ベース要素およびリッ
ジがそれぞれ、バルーンの伸縮性およびそれぞれ適切に設計されたリッジおよび
ベース要素の輪郭により、大動脈を通過する段階のときに安全に保持され、この
保持が解放されるように適切に輪郭づけることができる。
【0029】 しかし、自己展開型のメカニズムを持つカテーテルを用いることもでき、これ
もまた形状記憶合金からなり、本発明の固定システムとともに人工心臓弁の固定
を確実にする。
【0030】 しかし、各ケースにおいて、大動脈を通過する段階では、移植位置に届く前に
大動脈壁に好ましくない傷が付くのを避けるために、また必要とされる冷却のた
めに適切な熱的遮断を確実にするために、人工心臓弁を包むのが適切である。移
植位置に届いた後この囲みは破られ、固定を解放するメカニズム(dislocking)
が活性化される。そして、再度、大動脈からカテーテルに沿って取り除かれる。
【0031】 前述したように、形状記憶合金により構成された展開メカニズムが用いられる
場合、これは、人工心臓弁の外輪の領域で人工心臓弁に取り付けられた環状要素
として設計することができる。このような環状要素は、移植された人工心臓弁の
安定性を確保し、シールする機能を高めることができる。
【0032】 本発明を実施の形態に基づき、より詳細に説明する。
【0033】 図1は、人工心臓弁上の本発明の固定システムの実施の形態を示す図である。
【0034】 図1に示すように、人工心臓弁1のための本発明の固定システムの実施の形態
は、リッジ3上に形成されたフック型要素2を有し、このような各リッジ3は人
工心臓弁1の交連に配置され、そこに取り付けられる。
【0035】 本実施の形態において、リッジ3およびフック型要素2の両方とも、たとえば
ニチノールの名称で市販されている形状記憶合金により構成される。取り付けの
ため、リッジ3は、内側から人工心臓弁1に導入され、単に人工心臓弁1の交連
を通して押され、その交連を貫通する。
【0036】 形状記憶合金は図1に示したような形状に記憶され、転移温度の37℃を超え
るとその形状になる。しかし、人工心臓弁1の導入段階では、フック型要素2は
、導入が容易に行え、大動脈壁の損傷が避けられるように、比較的少容量を要し
、ほとんど突出しないように、リッジ3の長軸の方向にできるだけ遠くほぼ90
°に傾けることができる。
【0037】 ここで示した本実施の形態では、リッジ3にそれぞれ5個のフック型要素が形
成されている。全部で、少なくとも15個のフック型要素が用いられている。
【0038】 しかし、フック型要素2の数は容易に変更することができ、さらに、このよう
に複数のフック型要素2を含む複数のリッジ3が人工心臓弁1の一つの交連に、
取り付けられることもできる。
【0039】 その場合、ここで図示していないが、リッジ3はある角度に傾けて整列するこ
とができる。ここで、二つのこのようなリッジ3は、互いに反対側に傾くように
することができる。
【0040】 図示していない形状で、人工心臓弁1の外輪4の領域に付加的に環状要素を取
り付けることができる。
【0041】 さらに、固定を改良するために、フック型要素2およびそのフックにそれぞれ
突起を形成することができる。
【図面の簡単な説明】
【図1】 人工心臓弁上の本発明の固定システムの実施の形態を示す図である。
───────────────────────────────────────────────────── フロントページの続き (71)出願人 フィグーラ ハンス−ライネル ドイツ連邦共和国 イェナ 07749, ツ ィーゲンハイナー ストラッセ 109b (72)発明者 ダンム クリストフ ドイツ連邦共和国 イェナ 07743, シ ェフェルストラッセ 6 (72)発明者 ヴェーベル カルステン ドイツ連邦共和国 イェナ 07743, ル テルストラッセ 139 (72)発明者 リッゼ ステファン ドイツ連邦共和国 イェナ 07749, レ オ−ザッハゼ−ストラッセ 45 (72)発明者 グイェノット フォルケル ドイツ連邦共和国 イェナ 07749, オ ット−エンガォ−ストラッセ 4a (72)発明者 モハォプト マッチアス ドイツ連邦共和国 アルテンゲンナ 07778, ドルフストラッセ 2a (72)発明者 ハルニシュ ゲルト ドイツ連邦共和国 イェナ 07749, ベ ルトルド−デルブリュック−ストラッセ 76 (72)発明者 デルエル ペギー ドイツ連邦共和国 ゲッチンゲン 37083, ハー−ハンケル−ストラッセ 9 (72)発明者 フェラーリ マルクス ドイツ連邦共和国 イェナ 07747, ベ レンガッセ 13 (72)発明者 ランク クラオス ドイツ連邦共和国 コスペダ 07751, ヴァイスドルンヴェーグ 4 (72)発明者 フィグーラ ハンス−ライネル ドイツ連邦共和国 イェナ 07749, ツ ィーゲンハイナー ストラッセ 109b Fターム(参考) 4C081 AB17 BB04 BB07 CA291 CB051 CG01 CG03 DA03 4C097 AA27 BB01 BB04 CC01 CC05 CC12 CC13 DD04 MM03 MM04 MM09 SB02 SB03 SB09

Claims (15)

    【特許請求の範囲】
  1. 【請求項1】 移植可能な人工心臓弁の固定システムであって、 人工心臓弁(1)の交連に人工心臓弁材料を通して外側の方向に導かれたフッ
    ク型要素(2)が固定されたことを特徴とする固定システム。
  2. 【請求項2】 請求項1に記載の固定システムにおいて、 付加的なフック型要素(2)が前記人工心臓弁(1)の外輪に固定されたこと
    を特徴とする固定システム。
  3. 【請求項3】 請求項1または2に記載の固定システムにおいて、 前記フック型要素(2)は、前記人工心臓弁(1)に縫いつけられたことを特
    徴とする固定システム。
  4. 【請求項4】 請求項1または2に記載の固定システムにおいて、 前記フック型要素(2)は前記人工心臓弁(1)を突き抜け、リッジ(3)ま
    たはベース部材によって内側に支持されたことを特徴とする固定システム。
  5. 【請求項5】 請求項1乃至4いずれかに記載の固定システムであって、 複数のフック型要素(2)が一つの共通のリッジ(3)上に配置され、少なく
    とも一つの前記リッジ(3)が一つの交連に固定されたことを特徴とする固定シ
    ステム。
  6. 【請求項6】 請求項5に記載の固定システムにおいて、 少なくとも二つの前記フック型要素(2)がそれぞれ前記一つのリッジ(3)
    上に配置されたことを特徴とする固定システム。
  7. 【請求項7】 請求項1乃至6いずれかに記載の固定システムにおいて、 前記リッジ(3)は、大動脈の長軸方向に配列されたことを特徴とする固定シ
    ステム。
  8. 【請求項8】 請求項1乃至6いずれかに記載の固定システムにおいて、 前記リッジ(3)は、らせん形状に設計されたことを特徴とする固定システム
  9. 【請求項9】 請求項1乃至8いずれかに記載の固定システムにおいて、 前記リッジ(3)は少なくとも前記交連と同じ長さであることを特徴とする固
    定システム。
  10. 【請求項10】 請求項1乃至9いずれかに記載の固定システムにおいて、 少なくとも前記フック型要素(2)は、形状記憶合金により構成されたことを
    特徴とする固定システム。
  11. 【請求項11】 請求項1乃至10いずれかに記載の固定システムにおいて
    、 大動脈壁内に固定するために、前記フック型要素(2)は、展開した状態で少
    なくとも2mmの有効な高さを有し、これらのフック型要素(2)は、前記人工
    心臓弁(1)から突出することを特徴とする固定システム。
  12. 【請求項12】 請求項1乃至11いずれかに記載の固定システムにおいて
    、 前記フック型要素(2)は、その上に突起が設けられたピン形状に設計された
    ことを特徴とする固定システム。
  13. 【請求項13】 請求項1乃至12いずれかに記載の固定システムにおいて
    、 前記フック型要素(2)の前記フックは、様々な方向に曲げられたことを特徴
    とする固定システム。
  14. 【請求項14】 請求項1乃至13いずれかに記載の固定システムにおいて
    、 前記外輪の領域で、前記人工心臓弁(1)の内側に一つの環状要素が固定され
    たことを特徴とする固定システム。
  15. 【請求項15】 請求項14に記載の固定システムにおいて、 前記環状要素はエラストマー材料または形状記憶合金により構成されたことを
    特徴とする固定システム。
JP2001563037A 2000-02-28 2001-02-28 移植可能な人工心臓弁の固定システム Expired - Fee Related JP4246433B2 (ja)

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PCT/DE2001/000836 WO2001064137A1 (de) 2000-02-28 2001-02-28 Verankerung für implantierbare herzklappenprothesen

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WO2001064137A1 (de) 2001-09-07
ES2353733T3 (es) 2011-03-04
PT1259193E (pt) 2011-01-13
US20030149476A1 (en) 2003-08-07
US20070005129A1 (en) 2007-01-04
ATE488199T1 (de) 2010-12-15
DK1259193T3 (da) 2011-01-31
DE50115708D1 (de) 2010-12-30
EP1259193B1 (de) 2010-11-17
DE10010073B4 (de) 2005-12-22
DE10010073A1 (de) 2001-09-27
JP4246433B2 (ja) 2009-04-02
CY1111106T1 (el) 2015-06-11
US7896913B2 (en) 2011-03-01
EP1259193A1 (de) 2002-11-27

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