Various shape bubbles generated by Ho: YAG laser irradiation for vascular treatments

E. Nakatani, E. Yamashita, Tsunenori Arai

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Various shape bubbles were generated by changing holmium-yttrium-aluminum- garnet (Ho:YAG) laser irradiation parameters. Intensive pressure waves induced by their bubble collapse were measured. The Ho:YAG laser-induced bubble in water-containing liquid had been reported by many authors regarding its shape and generated collapse pressure. However, controllability of the bubble shape and generated collapse pressure with various irradiation parameters has been still unclear. In our experiments, we changed the core diameter of optical liber (400μm or 600μm), laser pulsewidth (FWHM 100-300μs or 50-120μs, depends on laser output energy), and positions of the optical fiber tip in a sheath. The bubble shapes were observed with the time resolved flashlamp photography. The expansion and contraction rates of the bubble volume were determined by the obtained bubble shapes. The collapse pressure was measured with a small diameter (0,5mm) calibrated hydrophone. The long Ho:YAG laser pulse irradiation made long shape bubble so-called "pear shaped" bubble. This pear shaped bubble generated low collapse pressure comparing to the spherical shape bubble which was generated by the short pulsewidth. Using the constant laser pulse energy, we obtained large volume bubbles with high collapse pressure by the optical fiber of 600μm core diameter. When the optical fiber tip was located in the sheath, the bubble expanded to the lateral direction, and then the high collapse pressure was observed along the lateral direction. Therefore, we could arrange the bubble shape by changing the irradiation parameters. We discussed the proper bubble shape for various intra-vascular applications.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6084
DOIs
Publication statusPublished - 2006
EventOptical Interactions with Tissue and Cells XVII - San Jose, CA, United States
Duration: 2006 Jan 232006 Jan 25

Other

OtherOptical Interactions with Tissue and Cells XVII
CountryUnited States
CitySan Jose, CA
Period06/1/2306/1/25

Fingerprint

Laser beam effects
YAG lasers
bubbles
irradiation
Holmium
Garnets
Yttrium
Optical fibers
Irradiation
Aluminum
Lasers
Laser pulses
holmium
yttrium-aluminum garnet
Hydrophones
Photography
optical fibers
lasers
Full width at half maximum
Controllability

Keywords

  • Angioplasty
  • Collapse pressure wave
  • Ho:YAG laser
  • Laser-induced bubble

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Nakatani, E., Yamashita, E., & Arai, T. (2006). Various shape bubbles generated by Ho: YAG laser irradiation for vascular treatments. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6084). [60840W] https://doi.org/10.1117/12.647697

Various shape bubbles generated by Ho : YAG laser irradiation for vascular treatments. / Nakatani, E.; Yamashita, E.; Arai, Tsunenori.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6084 2006. 60840W.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nakatani, E, Yamashita, E & Arai, T 2006, Various shape bubbles generated by Ho: YAG laser irradiation for vascular treatments. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6084, 60840W, Optical Interactions with Tissue and Cells XVII, San Jose, CA, United States, 06/1/23. https://doi.org/10.1117/12.647697
Nakatani E, Yamashita E, Arai T. Various shape bubbles generated by Ho: YAG laser irradiation for vascular treatments. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6084. 2006. 60840W https://doi.org/10.1117/12.647697
Nakatani, E. ; Yamashita, E. ; Arai, Tsunenori. / Various shape bubbles generated by Ho : YAG laser irradiation for vascular treatments. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6084 2006.
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