JP2017159072A - 腎神経変調療法のための多電極カテーテル組立体並びに関連するシステム及び方法 - Google Patents
腎神経変調療法のための多電極カテーテル組立体並びに関連するシステム及び方法 Download PDFInfo
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Abstract
Description
本願は、参照によりその全体が本明細書に組み込まれる、2012年5月11日に出願された米国特許仮出願第61/646,218号の利益及び優先権を主張するものである。
以下の出願も、参照によりそれらの全体が本明細書に組み込まれる。
腎神経変調療法は、腎臓を神経支配する神経の部分的又は完全な機能喪失又は他の効果的撹乱である。特に、腎神経変調療法は、腎臓を神経支配する神経性線維(すなわち、遠心性及び/又は求心性神経線維)に沿った神経通信を抑制する、減少させる、及び/又はブロックすることを含む。こうした機能喪失は、長期(例えば、恒久的、又は数ヶ月、数年、又は数十年の期間にわたる)となることがあり、又は短期(例えば、数分、数時間、数日、又は数週間の期間にわたる)となることがある。腎神経変調療法は、増加した全交感神経活性によって特徴付けられるいくつかの臨床的状態、特に、高血圧症、心不全、急性心筋梗塞、代謝症候群、インスリン抵抗性、糖尿病、左心室肥大、慢性腎疾患、及び末期腎疾患などの中枢交感神経過刺激、心不全における不適切な体液鬱滞、心腎症候群、骨粗鬆症、及び突然死に関連する状態を効果的に治療することが期待される。求心性神経信号の減少は、交感神経緊張/駆動の全身的減少に寄与し、腎神経変調療法は、全身性交感神経過活性又は亢進に関連するいくつかの状態を治療するのに有用となることが期待される。腎神経変調療法は、交感神経によって神経支配される種々の器官及び身体構造に潜在的に役立つ可能性がある。
以下の解説は、関係する患者解剖学及び生理学に関するさらなる詳細を提供する。このセクションは、該当する解剖学的構造及び生理学に関する前の説明を補足し及び拡充すること、並びに腎神経変調に関連する開示された技術及び治療上の利点に関する付加的な文脈を提供することを意図される。例えば、既述のように、腎血管構造のいくつかの特性は、腎神経変調を達成するための治療装置及び関連する方法の設計を知らせる、及びこうした装置に特定の設計要件を課すことがある。特定の設計要件は、腎動脈、尿管、又は腎盂の解剖学的形状にアクセスすること、治療装置の治療要素と管腔表面又は壁との安定した接触を容易にすること、及び/又は治療要素を用いて腎神経を効果的に変調することを含み得る。
SNSは、腸管神経系及び副交感神経系と共に、自律神経系の分岐である。これは基礎レベルでは常にアクティブであり(交感神経緊張と呼ばれる)、ストレスの場合に、よりアクティブになる。神経系の他の部分のように、交感神経系は、一連の相互接続されたニューロンを通じて動作する。交感神経ニューロンは、末梢神経系(PNS)の一部とよく考えられるが、多くは中枢神経系(CNS)内にある。脊髄の交感神経ニューロン(CNSの一部である)は、一連の交感神経節を介して末梢交感神経ニューロンと通信する。神経節内で、脊髄交感神経ニューロンは、シナプスを通じて末梢交感神経ニューロンと合流する。脊髄交感神経ニューロンは、したがってシナプス前(又は節前)ニューロンと呼ばれ、一方、末梢交感神経ニューロンは、シナプス後(又は節後)ニューロンと呼ばれる。
図6に示すように、SNSは、脳が身体と通信することを可能にする神経ネットワークを提供する。交感神経は、脊柱内部で起始し、脊髄の第1胸髄で始まる中間外側細胞柱(又は側角)の中の脊髄の中央に向かい、且つ第2又は第3腰髄に延びると考えられる。その細胞が脊髄の胸部領域及び腰部領域で始まるため、SNSは、胸腰部流出(thoracolumbar outflow)を有すると言われる。これらの神経の軸索は、前細根/前根を通して脊髄を出る。それらは、脊髄(知覚)神経節の近くを通り、そこでそれらは脊髄神経の前枝に入る。しかしながら、体性神経支配とは異なり、それらは脊椎の傍に延びる脊椎傍(脊柱の近くにある)又は脊椎前(大動脈の分岐の近くにある)神経節のいずれかに接続する白交通枝を通してすぐに分かれる。
図7に示すように、腎臓神経系は、腎動脈と密接に関連付けられる腎神経叢を含む。腎神経叢は、腎動脈を取り囲み且つ腎動脈の外膜内に組み込まれる自律神経叢である。腎神経叢は、腎臓の実体に到達するまで腎動脈に沿って延びる。腎神経叢に寄与する線維は、腹腔神経節、上腸間膜神経節、大動脈腎動脈神経節、及び大動脈神経叢から生じる。腎神経とも呼ばれる腎神経叢は、主として交感神経構成要素からなる。腎臓の副交感神経の神経活性はない(又は少なくとも非常に最小限である)。
メッセージは、SNSを通して二方向の流れで移動する。遠心性のメッセージは、身体の異なる部分における変化を同時にトリガする可能性がある。例えば、交感神経系は、心拍を加速する、気管支を広げる、大腸の運動性(動き)を減少させる、血管を収縮させる、食道の蠕動を増加させる、瞳孔拡張、立毛(鳥肌)、及び汗(発汗)を引き起こす、及び血圧を上昇させる可能性がある。求心性メッセージは、身体の種々の器官及び知覚レセプタから他の器官、特に脳に信号を運ぶ。
腎臓への交感神経は、血管、傍糸球体装置、及び尿細管で終端する。腎交感神経の刺激は、増加したレニン分泌、増加したナトリウム(Na+)再吸収、及び腎血流の減少を引き起こす。腎機能のこれらの神経性調節構成要素は、高められた交感神経緊張によって特徴付けられる疾患状態においてかなり刺激され、高血圧患者の血圧の上昇に明らかに寄与する。腎交感神経の遠心性刺激の結果としての腎血流の減少及び糸球体濾過率は、患者の臨床的状態及び治療に伴って典型的に変化する臨床的過程での慢性心不全の進行性の合併症としての腎機能障害である心腎症候群における腎機能の損失の礎となりうる。腎交感神経の遠心性刺激の結果を妨げる薬理学的戦略は、中枢作用性交感神経遮断薬、ベータ遮断薬(レニン分泌を減らすことを意図される)、アンギオテンシン変換酵素阻害薬及び受容体拮抗薬(レニン分泌の結果としてのアンギオテンシンII及びアルドステロンの活性化作用をブロックすることを意図される)、及び利尿薬(腎交感神経を介するナトリウム及び水分貯留に拮抗することを意図される)を含む。しかしながら、現在の薬理学的戦略は、限られた有効性、コンプライアンス問題、副作用、及び他のものを含む顕著な制限を有する。
腎臓は、腎知覚求心性神経を介して中枢神経系における一体の構造と通信する。いくつかの形態の「腎損傷」は、知覚求心性信号の活性化を誘起する可能性がある。例えば、腎虚血、一回拍出量又は腎血流の減少、又はアデノシンの豊富さは、求心性神経通信の活性化をトリガする可能性がある。図8A及び図8Bに示すように、この求心性通信は、腎臓から脳へ又は一方の腎臓から他方の腎臓へ(中枢神経系を介して)のものである場合がある。これらの求心性信号は、中枢神経に統合され、結果的に増加した交感神経流出をもたらす可能性がある。この交感神経駆動は腎臓の方に向けられ、これにより、RAASを活性化させ、増加したレニン分泌、ナトリウム貯留、流体体積保持、及び血管収縮を誘起する。中枢交感神経過活性はまた、心臓及び末梢血管構造のような交感神経を有する他の器官及び身体構造に影響し、結果的に説明した交感神経活性化の悪影響をもたらし、そのうちのいくつかの態様はまた血圧の上昇に寄与する。
上記で与えられるように、腎神経変調療法は、高血圧症、代謝症候群、インスリン抵抗性、糖尿病、左心室肥大、慢性末期腎疾患、心不全における不適切な体液鬱滞、心腎症候群、及び突然死のような増加した全交感神経活性、特に、腎交感神経活性によって特徴付けられるいくつかの臨床的条件の治療においておそらく価値がある。求心性神経信号の減少は交感神経緊張/駆動の全身的減少に寄与するので、腎神経変調療法はまた全身性交感神経亢進に関連する他の条件を治療するのに有用である可能性がある。したがって、腎神経変調療法はまた、図6で識別されるものを含む交感神経を有する他の器官及び身体構造に役立つ可能性がある。
本技術によれば、左及び/又は右腎動脈と密接に関連付けられる左及び/又は右腎神経叢RPの神経変調は、血管内アクセスを通じて達成されてもよい。図9Aが示すように、心臓の収縮によって動かされる血液は、心臓の左心室から大動脈によって運ばれる。大動脈は、胸郭を通して下行し、左腎動脈及び右腎動脈に分岐する。腎動脈の下で、大動脈は、左腸骨動脈及び右腸骨動脈に2つに分岐する。左腸骨動脈及び右腸骨動脈は、それぞれ左脚及び右脚を通して下行し、左大腿動脈及び右大腿動脈に合流する。
左及び/又は右腎神経叢の神経変調は、血管内アクセスを通じて本技術に従って達成される場合があるので、腎血管構造の特性及び特徴が、こうした腎神経変調を達成するための装置、システム、及び方法の設計に対して制約を課す及び/又は情報提供する可能性がある。これらの特性及び特徴のうちのいくつかは、患者集団にわたって及び/又は時間にわたって特定の患者内で、並びに高血圧症、慢性腎疾患、血管疾患、末期腎疾患、インスリン抵抗性、糖尿病、代謝症候群などのような疾患状態に対応して変化する可能性がある。本明細書で解説される場合のこれらの特性及び特徴は、処置の有効性及び血管内装置の特異的設計に対する支持を有する可能性がある。関心ある特性は、例えば、材料特性/機械特性、空間特性、流体力学特性/血流力学特性及び/又は熱力学特性を含んでもよい。
(2)血管壁に対する治療要素の一貫した且つ安定した位置決め、
(3)血管壁にわたる治療の効果的な適用、
(4)複数の治療場所を可能にするための治療装置の位置決め、潜在的には再位置決め、及び
(5)血流閉塞の回避又は持続時間の制限、といった上記で説明された課題に基づいて、関心をもたれる場合がある腎血管構造の種々の独立した及び依存する特性は、例えば、(a)血管直径、血管長さ、内膜−中膜の厚さ、摩擦係数、及び蛇行性、(b)血管壁の伸展性、剛性、及び弾性率、(c)ピーク収縮期、拡張末期血液流速、並びに平均収縮期−拡張期ピーク血液流速、及び平均/最大体積血液流量、(d)血液の及び/又は血管壁の比熱容量、血液の及び/又は血管壁の熱伝導率、及び/又は血管壁処置部位を通過する血流の熱対流性及び/又は放射熱伝達、(e)呼吸、患者の動き、及び/又は血流の脈動性によって誘起される大動脈に対する腎動脈の動き、及び(f)大動脈に対する腎動脈の分岐角を含む。これらの特性は、腎動脈に関してより詳細に説明されるであろう。しかしながら、腎神経変調を達成するのに用いられる装置、システム、及び方法に応じて、腎動脈のこうした特性はまた、設計特徴をガイドし及び/又は制約する可能性がある。
以下の付記は、本技術のいくつかの実施形態の例証である。
1.カテーテル装置であって、
近位部分及び遠位部分を有する細長い管状のシャフトと、
前記細長いシャフトの前記遠位部分に配置され、ヒトの患者の腎動脈内の目標位置に存在するように適合された治療組立体と、
を備え、前記治療組立体が支持構造体を含み、前記支持構造体が、
事前成形される螺旋形の形状を有し、内部に管腔を有する管状構造体であり、ニチノールマルチフィラー撚線からなる、制御部材と、
前記支持構造体に装備される複数のエネルギー送達要素と、
を備え、
前記細長い管状のシャフトと前記治療組立体が、医療用ガイドワイヤをスライド可能に受け入れるように構成されたガイドワイヤ管腔を内部に一緒に画定し、
前記治療組立体に対する前記ガイドワイヤの軸方向移動が、前記支持構造体を、(a)薄い外形の送達構成と(b)前記制御部材の前記事前成形される螺旋形の形状をとる傾向がある展開構成との間で変形する、
カテーテル装置。
2.前記ガイドワイヤの少なくとも遠位部が前記治療組立体の前記ガイドワイヤ管腔の中にとどまる状態で、前記治療組立体が前記薄い外形の送達構成と前記展開構成との間で変形するように構成される、例1に記載のカテーテル装置。
3.前記支持構造体が、前記ガイドワイヤの最遠位先端部が前記治療組立体の遠位先端部と概して位置合わせされるときに前記治療組立体が前記展開構成に変形するように、前記ガイドワイヤの遠位領域によって提供されるまっすぐにする力を克服するのに十分な形状回復力を有する、例2に記載のカテーテル装置。
4.前記ガイドワイヤが前記治療組立体の前記ガイドワイヤ管腔内にあるときに前記支持構造体が前記ガイドワイヤの遠位領域によって提供されるまっすぐにする力を克服するのに不十分な形状回復力を有し、
前記ガイドワイヤの最遠位部が前記ガイドワイヤ管腔を通して前記治療組立体の近位位置に引き出されるときに前記治療組立体が前記展開構成に変形するように構成される、
例1に記載のカテーテル装置。
5.前記治療組立体の遠位部が、前記ガイドワイヤのための開口部を提供し、前記展開構成において前記ガイドワイヤを前記腎動脈の壁から離れる方に誘導するように構成された可撓性の湾曲した先端部をさらに備える、例1から例4までのいずれか一つに記載のカテーテル装置。
6.前記可撓性の湾曲した先端部がポリエーテルブロックアミドコポリマーからなる、例5に記載のカテーテル装置。
7.前記可撓性の湾曲した先端部が熱可塑性ポリエーテルウレタン材料からなる、例5に記載のカテーテル装置。
8.前記可撓性の湾曲した先端部が前記熱可塑性ポリエーテルウレタン材料に約5〜30重量パーセントのシロキサンが混合されたものからなる、例7に記載のカテーテル装置。
9.前記展開構成において、前記支持構造体に装備される前記エネルギー送達要素が、前記腎動脈の縦軸に沿って互いから離間され、前記腎動脈の壁との並置関係を維持するように構成される、例1から例8までのいずれか一つに記載のカテーテル装置。
10.前記エネルギー送達要素が一連のバンド電極を含む、例1から例9までのいずれか一つに記載のカテーテル装置。
11.前記バンド電極のうちの少なくとも1つがテーパした端部を備え、前記テーパした端部が前記支持構造体の外面と前記少なくとも1つのバンド電極の外面との間に鈍角を提供するように構成される、例10に記載のカテーテル装置。
12.前記治療組立体が4つのエネルギー送達要素を備える、例1から例11までのいずれか一つに記載のカテーテル装置。
13.前記薄い外形の送達構成の前記治療組立体の少なくとも長手方向の部分を取り囲む及び拘束する後退可能な装填ツールをさらに備える、例1から例12までのいずれか一つに記載のカテーテル装置。
14.前記装填ツールが丸みのある縁を有する遠位端部を備える、例13に記載のカテーテル装置。
15.ヒトの患者を治療するための腎神経変調療法システムであって、
近位端及び遠位端を有する細長いシャフトであり、前記シャフトの前記遠位端が手技ガイドワイヤの上で前記患者の腎動脈に血管内で送達されるように構成された、細長いシャフトと、
前記細長いシャフトの前記遠位端に又はその近傍に配置される事前に形状設定される管状の渦巻き形構造体であり、非拡張構成と前記事前に形状設定される渦巻き形構造体の形状をとる傾向がある拡張構成との間で変形するように構成され、少なくとも部分的にニチノールマルチフィラー撚線からなる、渦巻き形構造体と、
前記渦巻き形構造体に関連する複数の電極と、
を備え、
前記細長いシャフトと前記渦巻き形構造体が、一緒にガイドワイヤ管腔を内部に画定し、
前記ガイドワイヤ管腔が、前記渦巻き形構造体を前記患者の腎血管内の目標処置部位に配置するために、及び前記渦巻き形構造体を前記非拡張構成に拘束するために前記手技ガイドワイヤをスライド可能に受け入れるように構成され、
前記ガイドワイヤの遠位端部が少なくとも部分的に前記ガイドワイヤ管腔内にあるように前記手技ガイドワイヤを前記渦巻き形構造体に対して前記ガイドワイヤ管腔を通して近位に移動させることで前記渦巻き形構造体が前記拡張構成に変形する、
システム。
16.前記手技ガイドワイヤが、変化する可撓性を有する遠位部をそれに沿うように備え、さらに、前記渦巻き形構造体が前記拡張構成にあるときに、前記ガイドワイヤの少なくとも前記遠位部の領域が、前記渦巻き形構造体によって画定される前記ガイドワイヤ管腔の部分内にとどまるように構成される、例15に記載のシステム。
17.前記渦巻き形構造体を覆う、且つ前記渦巻き形構造体と密接に接触する可撓性チューブをさらに備える、例15又は例16に記載のシステム。
18.前記複数の電極が接着剤材料を用いて前記可撓性チューブに結合される、例17に記載のシステム。
19.前記複数の電極が金からなる、例15から例18までのいずれか一つに記載のシステム。
20.前記複数の電極が、前記患者の外部のエネルギー源に個々に接続可能であり、前記エネルギー源が、治療中に各電極に送達されるエネルギーを個々に制御可能である、例15から例19までのいずれか一つに記載のシステム。
21.腎神経変調療法を行う方法であって、
細長いシャフトと、
前記シャフトの遠位部に配置され、少なくとも部分的にニチノールマルチフィラー撚線で形成された管状構造体からなる多電極アレイと、
を備える腎神経変調療法カテーテルを、ガイドワイヤの上でヒトの患者の腎血管内の目標処置部位及び前記患者の腎神経の少なくとも近傍に薄い外形の送達構成で血管内で送達することと、
前記カテーテルが前記薄い外形の送達構成から展開構成に変形するまで前記ガイドワイヤを近位方向に引き出し、前記管状構造体は、前記腎血管の壁と接触し、且つ前記血管を通して血液が流れることを可能にするように構成された、半径方向に拡張された概して渦巻き形の形状を有し、
前記腎神経に沿った神経通信を抑制するために前記多電極アレイの1つ以上の電極にエネルギーを選択的に送達することと、
を含む、方法。
22.前記多電極アレイの1つ以上の電極にエネルギーを選択的に送達することが、前記腎血管に沿って複数の損傷部を所望のパターンでもたらすことを含む、例21に記載の方法。
23.前記損傷部が重ならないように前記多電極アレイの前記個々の電極が十分に離間される、例21又は例22に記載の方法。
24.前記患者の体外に外部アースを取り付けることをさらに含み、前記1つ以上の電極にエネルギーを選択的に送達することが、前記各電極と前記外部アースとの間で電界をモノポーラの様式で送達することをさらに含む、例21から例23までのいずれか一つに記載の方法。
25.前記エネルギーを選択的に送達することが、前記多電極アレイの前記電極間で電界をバイポーラの様式で選択的に送達することを含む、例21から例23までのいずれか一つに記載の方法。
26.前記治療組立体が変形するまで前記ガイドワイヤを近位方向に引き出すことが、前記治療組立体が前記展開構成に変形した後で前記ガイドワイヤの少なくとも一部が前記治療組立体にとどまるように前記ガイドワイヤを前記治療組立体から一部だけ引き出すことを含む、例21から例25までのいずれか一つに記載の方法。
27.前記治療組立体が変形するまで前記ガイドワイヤを近位方向に引き出すことが、前記ガイドワイヤの最遠位部が前記治療組立体の近位位置に引き出されるように前記ガイドワイヤを前記治療組立体から十分に引き出すことを含む、例21から例25までのいずれか一つに記載の方法。
28.前記目標処置部位が第1の目標処置部位を含み、
前記多電極アレイを前記展開構成から前記薄い外形の送達構成に戻るように変形させるために前記多電極アレイの1つ以上の電極にエネルギーを選択的に送達した後で前記ガイドワイヤを遠位方向に前進させることと、
前記第1の処置部位とは異なる第2の目標処置部位に前記カテーテルを再位置決めすることと、
前記治療組立体を前記送達構成から前記展開構成に再び変形させるために前記ガイドワイヤを近位方向に引き出すことと、
前記第2の目標処置部位に位置決めされた前記多電極アレイの1つ以上の電極にエネルギーを選択的に送達することと、
をさらに含む、例21から例27までのいずれか一つに記載の方法。
本技術のいくつかの実施形態の上記の詳細な説明は、網羅的なものとなること又は本技術を上記で開示された正確な形態に限定することを意図されない。本技術の具体的な実施形態及び例は例証する目的で上記で説明されるが、本技術の範囲内で当該技術分野の当業者が認識するであろう種々の等価な修正が可能である。例えば、ステップは所与の順序で提示されるが、代替的な実施形態は、ステップを異なる順序で行ってもよい。本明細書で説明される種々の実施形態はまた、さらなる実施形態を提供するために組み合わされてもよい。
Claims (12)
- ヒトの患者を治療するための腎神経変調カテーテルであって、
該腎神経変調カテーテルは、
近位部及び遠位部を有するシャフトを具備し、該シャフトの遠位端は、血管内でガイドワイヤ上を患者の腎血管まで送達できるように構成されており、
前記シャフトの遠位端又はその近位側に具備された事前に形状設定された螺旋構造体を具備し、該螺旋構造体は、低い外形の送達構成と事前に形状設定された螺旋構造体の形状を取るような展開構成との間で変形できるように構成されており、かつ、該螺旋構造体は、少なくともその一部がニチノールで構成されており、
更に、前記螺旋構造体に搭載された複数のエネルギー送達要素を具備し、
前記シャフトと前記螺旋構造体は、それらの中を貫通するガイドワイヤ管腔を一緒に画定し、該ガイドワイヤ管腔は、患者の腎血管内の目標治療部位に前記螺旋構造体を配置するためにガイドワイヤをスライド可能に受け入れ、かつ、該螺旋構造体を低い外形の送達構成に拘束できるように構成されており、該螺旋構造愛は、前記ガイドワイヤの最遠位端部が該螺旋構造体の中に配置されるまで、該ガイドワイヤを前記ガイドワイヤ管腔内で近位側に移動させることで送達構成と展開構成との間で双方向に変形可能である
ことを特徴とする腎神経変調カテーテル。
- 前記複数のエネルギー送達要素は、それぞれが、患者の体外にあるエネルギー源に個別に接続可能であり、該エネルギー源は、治療の間、個々のエネルギー送達要素に送達されるエネルギーを個別に制御可能である
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記複数のエネルギー送達要素は金をその構成成分とする
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記複数のエネルギー送達要素は、一連のバンド電極を具備する
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記バンド電極の少なくとも1つは、テーパ付端部を具備し、該テーパ付端部は、支持構造体の外側面とバンド電極の該少なくとも1つの外側面との間に鈍角を提供するように構成されている
ことを特徴とする請求項4に記載の腎神経変調カテーテル。
- 前記複数のエネルギー送達要素は、前記螺旋構造体に搭載された4つの電極を具備する
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記螺旋構造体は、前記ガイドワイヤの少なくとも最遠位端部が前記ガイドワイヤ管腔の中にあって該螺旋構造体の中に配置されている間に送達構成と展開構成との間で変形できるように構成されている
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記螺旋構造体は、ガイドワイヤの最遠位端が前記螺旋構造体の先端部と位置がほぼ合わさったときに、該螺旋構造体を展開構成に変えることができるように、ガイドワイヤの遠位部により提供される真っ直ぐにする力を克服するのに十分な形状回復力を有する
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記螺旋構造体は、更に、ガイドワイヤ管腔の遠位部の開口部で終端する可撓性の湾曲した先端部を具備しており、それにより、該螺旋構造体が展開構成となり、ガイドワイヤの最遠位端が前記遠位部の開口部から前進したときに、ガイドワイヤの最遠位端が腎血管の壁から離れる方に誘導される
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記可撓性の湾曲した先端部は、ポリエーテルブロックアミドコポリマーをその構成成分とする
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
- 前記可撓性の湾曲した先端部は、熱可塑性ポリエーテルウレタン材料をその構成成分とする
ことを特徴とする請求項9に記載の腎神経変調カテーテル。
- 前記可撓性の湾曲した先端部は、少なくともその一部に、ニチノールマルチフィラー撚線を含む
ことを特徴とする請求項1に記載の腎神経変調カテーテル。
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