SOME LASER-TISSUE INTERACTIONS IN 308 NM EXCIMER LASER CORONARY ANGIOPLASTY

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説明

Some physical concepts of laser-tissue interactions that occur in 308nm excimer laser angioplasty are addressed. Monte Carlo numerical computations were used to analyze the light fluence rate distributions resulting from finite diameter laser beams incident on tissue, as applied by fiber optic light delivery catheters. The fluence rate at the inside part of the tissue surface from a 0.2mm diameter fiber emitting 308nm light, is increased more than twice relative to the incident power density. The light fluence rate distribution inside the tissue spreads very little outside the incident beam diameter. Therefore, the distributions from different fibers in multifiber catheters will not overlap unless the fibers are very close together. The maximum fluence rate decreases with decreasing beam diameters, Ablation of tissue by a 308nm excimer laser delivery system in contact with the tissue resulted in a damage zone adjacent to the crater wall due to expansion of the gaseous debris trapped under the tip of delivery system. In case of contact irradiation, the ablation was much more efficient than in case of non contact irradiation. Direct temperature measurements during excimer laser ablation by an IR camera showed that temperature accumulation will occur when a sequence of pulses is applied at frequencies of at least 5Hz. The temperature rise above ambient under circumstances simulating clinical conditions is measured to be 66±7°C.

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詳細情報 詳細情報について

  • CRID
    1390001205454209920
  • NII論文ID
    130004629920
  • DOI
    10.2530/jslsm1980.11.supplement_11
  • ISSN
    02886200
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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