JP2014004219A - 血栓除去装置 - Google Patents
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- 210000004204 blood vessel Anatomy 0.000 claims abstract description 13
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- 230000010287 polarization Effects 0.000 abstract description 15
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- 208000034158 bleeding Diseases 0.000 description 2
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- 210000004556 brain Anatomy 0.000 description 1
- 230000002490 cerebral effect Effects 0.000 description 1
- 206010008118 cerebral infarction Diseases 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
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Abstract
【解決手段】血栓除去装置1は、血管内の血栓に光を照射して該血栓を除去する装置である。血栓除去装置1は、光源11、偏光ビームスプリッタ12、λ/4板13、光検出器14、光ファイバ15、コネクタ16、光ファイバ17、カテーテル18および窓部材19を備える。光ファイバ17の第2端17bの端面に反射低減膜が形成されている。窓部材19の第2面19bに、血液が接しているときに光の反射を低減する反射低減膜が形成されている。窓部材19の第1面19aにおける反射率Ra、および、窓部材19の第2面19bに気体が接しているときの窓部材19の第2面19bにおける反射率Rbそれぞれが、所定値に設定されている。
【選択図】図1
Description
Claims (5)
- 血管内の血栓に光を照射して該血栓を除去する装置であって、
波長λの光を出力する光源と、
前記光源から出力された光を第1端に入力して導光し、その光を第2端から出力する光ファイバと、
前記光ファイバを内部に収納するカテーテルと、
前記カテーテルの先端部において前記カテーテルの内部空間を封止し、前記光ファイバの前記第2端のコア端面に対して離間して設けられ、前記光ファイバの前記第2端から出力された光を第1面から第2面へ透過させて該光を外部へ出力する窓部材と、
前記光源から出力された光が前記光ファイバおよび前記窓部材を経て外部へ出力されるまでの光路の何れかの箇所で生じた反射光の強度を検出する光検出器と、
を備え、
前記光ファイバの前記第2端の端面に前記波長λの光の反射を低減する反射低減膜が形成され、前記窓部材の前記第2面に血液が接しているときに前記波長λの光の反射を低減する反射低減膜が形成されており、
前記窓部材の前記第2面に血液が接しているときに前記窓部材の前記第1面および前記第2面それぞれで反射されて前記光検出器により検出される反射光の強度をI1とし、前記窓部材の前記第2面に気体が接しているときに前記窓部材の前記第1面および前記第2面それぞれで反射されて前記光検出器により検出される反射光の強度をI2とし、前記光ファイバが破断した場合に当該破断面で反射されて前記光検出器により検出される反射光の強度をI3としたときに、これらの強度I1〜I3が互いに異なるように、前記窓部材の前記第1面における波長λでの反射率、および、前記窓部材の前記第2面に気体が接しているときの前記窓部材の前記第2面における波長λでの反射率が設定されている、
ことを特徴とする血栓除去装置。 - 前記光ファイバの前記第2端においてコア端面が周縁部に対して窪んでおり、前記周縁部が前記窓部材の前記第1面に当接しており、前記光ファイバのコア端面と前記窓部材の前記第1面とが互いに離間している、ことを特徴とする請求項1に記載の血栓除去装置。
- 前記窓部材の前記第1面において前記光ファイバのコア端面に対向する領域が周縁部に対して窪んでおり、前記光ファイバの前記第2端の端面が前記窓部材の前記周縁部に当接しており、前記光ファイバのコア端面と前記窓部材の前記第1面とが互いに離間している、ことを特徴とする請求項1に記載の血栓除去装置。
- 前記光ファイバの前記第2端のクラッド端面と前記窓部材の前記第1面との間に環状部材が設けられて、前記光ファイバのコア端面と前記窓部材の前記第1面とが互いに離間している、ことを特徴とする請求項1に記載の血栓除去装置。
- 前記光ファイバのコア端面と前記窓部材の前記第1面との間に透明部材が挿入されている、ことを特徴とする請求項1に記載の血栓除去装置。
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US10478322B2 (en) | 2017-06-19 | 2019-11-19 | Covidien Lp | Retractor device for transforming a retrieval device from a deployed position to a delivery position |
US10499939B2 (en) | 2013-11-13 | 2019-12-10 | Covidien Lp | Galvanically assisted attachment of medical devices to thrombus |
US10524945B2 (en) | 2013-10-04 | 2020-01-07 | Covidien Lp | Stents twisted prior to deployment and untwisted during deployment |
US10537344B2 (en) | 2015-10-23 | 2020-01-21 | Covidien Lp | Rotatable connection between an intervention member and a manipulation member of an endovascular device |
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US11058444B2 (en) | 2017-12-11 | 2021-07-13 | Covidien Lp | Electrically enhanced retrieval of material from vessel lumens |
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