JP5192247B2 - Octプローブ - Google Patents
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- JP5192247B2 JP5192247B2 JP2008017645A JP2008017645A JP5192247B2 JP 5192247 B2 JP5192247 B2 JP 5192247B2 JP 2008017645 A JP2008017645 A JP 2008017645A JP 2008017645 A JP2008017645 A JP 2008017645A JP 5192247 B2 JP5192247 B2 JP 5192247B2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
- G02B6/327—Optical coupling means having lens focusing means positioned between opposed fibre ends with angled interfaces to reduce reflections
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0062—Arrangements for scanning
- A61B5/0066—Optical coherence imaging
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0073—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by tomography, i.e. reconstruction of 3D images from 2D projections
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
- A61B5/6847—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive mounted on an invasive device
- A61B5/6852—Catheters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4795—Scattering, i.e. diffuse reflection spatially resolved investigating of object in scattering medium
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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- Heart & Thoracic Surgery (AREA)
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Description
被検体に挿入されるシース内にあって、光源から光ファイバを通して伝搬した光を反射面により曲げてから前記シースの透明部分を透過させて前記被検体に照射するとともに、該被検体からの反射光を前記反射面により反射して前記光ファイバに導入する光学系を備えたOCTプローブにおいて、
前記光学系が、前記反射面からの光を前記シースの内面に斜めに向けて出射させる出射面(被検体からの反射光が入射することも考慮すれば、入出射面と言える)と、該シースの内面で反射された光が前記光ファイバに入射するのを防止するシース反射光逆入防止部とを備えていることを特徴とするものである。
前記レンズの一部に前記反射面が形成され、
前記反射面とは別に、前記レンズの一部に前記シース反射光逆入防止部が形成され、
前記シース反射光逆入防止部の形成箇所が、前記シースの内面で反射された反射光の光路上に該当するレンズの一部とされた場合は、
前記光ファイバが、シングルモード型の第一の光ファイバ、およびそれと端部同士が接続された単一屈折率構造を有する第二の光ファイバから構成され、
前記第二の光ファイバの、第一の光ファイバに接続する側と反対側の端部が溶融されて溶融部が形成され、
この溶融部に、それと一体的に形成されるか、もしくはそこに接合されてなるレンズが取り付けられ、
前記第二の光ファイバの屈折率が、前記第一の光ファイバのコアの屈折率と等価に設定され、
前記溶融部の屈折率が前記第二の光ファイバの屈折率と等価に設定され、
前記レンズの屈折率が前記第二の光ファイバの屈折率と等価に設定され、
前記溶融部並びに前記レンズが、それぞれ一部に球形状部分を有する形状とされた上で、
r2: 溶融部の球形状部分の半径、rl: レンズの球形状部分の半径、ωO:第一の光ファイバのコア半径、λ:光ファイバを伝搬する光の真空中での波長、n:波長λに対する第二の光ファイバの屈折率、dO:第二の光ファイバ端部から前記レンズの出射端までの伝搬長、φcoreless:第二の光ファイバの外径、ωcoreless:第二の光ファイバの溶融部側端部におけるビーム半径としたとき、
前記光ファイバを内部に挿通させた上で前記シース内に挿入されるスリーブが設けられ、
このスリーブの内周と前記光ファイバの外周とが接着剤によって接着される場合は、
上記接着剤として光吸収性の接着剤を用いて、この接着剤を前記シース反射光逆入防止部とすることも可能である。
その後、第一の光ファイバが接続されている側と反対側の第二の光ファイバの端部を溶融することで、前記半径r2の値に設定された球状の溶融部を形成し、
次に、前記溶融部をさらに溶融することによって、あるいは別体のレンズを接合することによって前記レンズを形成し、
次に、前記レンズの一部に平面状の反射面を形成すると共に、さらに前記反射面とは別に、前記レンズの一部をカットして前記シース反射光逆入防止部を形成するものである。
2 第一の光ファイバ
3 第二の光ファイバ
4 溶融部
5 レンズ
5a レンズの反射面
5b レンズの平面
5c レンズの光入出射面(出射面)
7 シース
7a シースの内面
8 伝搬光
8R 反射光
9 スリーブ
10 接着剤
Claims (6)
- 被検体に挿入されるシース内にあって、光源から光ファイバを通して伝搬した光を反射面により曲げてから前記シースの透明部分を透過させて前記被検体に照射するとともに、該被検体からの反射光を前記反射面により反射して前記光ファイバに導入する光学系を備えたOCTプローブにおいて、
前記光学系が、前記反射面からの光を前記シースの内面に斜めに向けて出射させる出射面を有するレンズ体を有し、
前記レンズ体が、前記シースの内面で反射された光が前記光ファイバに入射するのを防止するように、前記シースの内面で反射された光の光路上に該当するレンズ体の一部がカットされたカット部を有することを特徴とするOCTプローブ。 - 前記反射面が、前記光ファイバからの光を略直角に曲げるように全反射させ、かつ前記レンズ体に設けられたものであり、
前記出射面が、前記反射面からの光を集光して出射させる凸状球面であることを特徴とする請求項1記載のOCTプローブ。 - 前記光ファイバが、シングルモード型の第一の光ファイバ、およびそれと端部同士が接続された単一屈折率構造を有する第二の光ファイバから構成され、
第一の光ファイバに接続する側と反対側の前記第二の光ファイバの端部が溶融されて溶融部が形成され、前記レンズ体が前記溶融部と一体的に形成されるかもしくは前記溶融部に接合されて、前記レンズ体が前記第二の光ファイバに取り付けられたものであり、
前記第二の光ファイバの屈折率が、前記第一の光ファイバのコアの屈折率と等価に設定され、
前記溶融部の屈折率が前記第二の光ファイバの屈折率と等価に設定され、
前記レンズ体の屈折率が前記第二の光ファイバの屈折率と等価に設定され、
前記溶融部並びに前記レンズ体が、それぞれ一部に球形状部分を有する形状を有し、
前記反射面が前記レンズ体に形成されたものであり、
r2: 溶融部の球形状部分の半径、rl: レンズ体の球形状部分の半径、ωO:第一の光ファイバのコア半径、λ:光ファイバを伝搬する光の真空中での波長、n:波長λに対する第二の光ファイバの屈折率、dO:第二の光ファイバ端部から前記レンズの出射端までの伝搬長、φcoreless:第二の光ファイバの外径、ωcoreless:第二の光ファイバの溶融部側端部におけるビーム半径としたとき、
- 前記第一の光ファイバと前記第二の光ファイバの各外径が、互いに略同一とされていることを特徴とする請求項3記載のOCTプローブ。
- 前記光ファイバを内部に挿通させた上で前記シース内に挿入されるスリーブが設けられ、
このスリーブの内周と前記光ファイバの外周とを接着する接着剤として光吸収性の接着剤が用いられていることを特徴とする請求項1から4いずれか1項記載のOCTプローブ。 - 前記出射面に、前記光に対するARコートが形成されていることを特徴とする請求項1から5いずれか1項記載のOCTプローブ。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2008017645A JP5192247B2 (ja) | 2008-01-29 | 2008-01-29 | Octプローブ |
US12/361,105 US7805034B2 (en) | 2008-01-29 | 2009-01-28 | OCT probe for eliminating ghost images |
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JP2008017645A JP5192247B2 (ja) | 2008-01-29 | 2008-01-29 | Octプローブ |
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JP2009178229A JP2009178229A (ja) | 2009-08-13 |
JP5192247B2 true JP5192247B2 (ja) | 2013-05-08 |
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JP (1) | JP5192247B2 (ja) |
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