Ho: YAG laser irradiation in blood vessel as a vasodilator: ex vivo study

E. Nakatani, T. Iwasaki, K. Kaneko, N. Shimazaki, T. Arai

研究成果: Conference contribution

1 被引用数 (Scopus)


We studied Ho:YAG laser irradiation in blood vessel as a vasodilator ex vivo. We thought that the Ho:YAG laser-induced bubble expansion might be able to dilate the vessel because we found the vessel wall expansion after the Ho:YAG laser irradiation, that is steady deformation, in the vessel ex vivo. There have been many reports regarding to the Ho:YAG laser irradiation in the vessel. Most of studies concentrated on the interaction between Ho:YAG laser irradiation and vessel wall to investigate side effect on Ho:YAG laser angioplasty. We proposed to use the Ho: YAG laser-induced bubble expansion as a vasodilator. We studied vasodilation effect of the Ho: YAG laser-induced bubble ex vivo. The flash lamp excited Ho:YAG laser surgical unit (IH102, NIIC, Japan) (λ=2.1μm) was used. The laser energy was delivered by a silica glass fiber (outer diameter: 1000μm, core diameter: 600μm). The laser-induced bubble was generated in the extracted fresh porcine carotid artery with the warmed saline perfusion. The laser energy at the fiber tip was ranging from 170-1300mJ per pulse. Number of the laser irradiation was ranged from 20pulses to 100pulses. The outer diameter of the vessel was observed. To examine the change in mechanical properties of the vessel wall, the stress-strain curve of the laser-irradiated vessel was measured. Birefringence observation and microscopic observation of staining specimen were performed. When the laser energy was set to 1300mJ per pulse, the outer diameter of the vessel after the laser irradiation was expanded by 1.4 times comparing with that of before the laser irradiation and the dilatation effect was kept even at 10minutes after the irradiation. The elasticity modulus of the artery by collagen was changed by the laser irradiation. In the polarized microscopic observation, the brightness of the intimal side of the vessel is increased comparing with that of the normal. We think this brightness increasing may be attributed to birefringence change by the arrangement of stretched collagen fiber. We suppose it is likely to be able to use the Ho:YAG laser irradiation as a temporary vasodilater tool in spite of further study should be performed.

ホスト出版物のタイトルPhotonic Therapeutics and Diagnostics III
出版ステータスPublished - 2007 8月 31
イベントPhotonic Therapeutics and Diagnostics III - San Jose, CA, United States
継続期間: 2007 1月 202007 1月 21


名前Progress in Biomedical Optics and Imaging - Proceedings of SPIE


OtherPhotonic Therapeutics and Diagnostics III
国/地域United States
CitySan Jose, CA

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 原子分子物理学および光学
  • 放射線学、核医学およびイメージング


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