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$B!!!!(BStudy of laser induced underwater shock waves in an optical tube for medical applications

$B!!!!!!(BNanomedicine Division, Tohoku University Biomedical Engineering Research Organization (TUBERO) S.H.R.Hosseini, K. Takayama

Production of micro underwater shock waves and vapor cavities induced by short pulse laser irradiation through an optical fiber has been studied. Energy source was a Q-switched Ho:YAG laser with 91 mJ/Pulse energy measured at the end of a 0.60 mm diameter quartz glass optical fiber, pulse duration of 200 ns, and wavelength of 2100 nm. For visualization of laser induced shock waves in a confined space, a transparent tube of 5 mm inner diameter with 13.3 mm and 40.0 mm dimension aspheric shape outer wall was designed and constructed. This 60.0 mm length test section was made of acrylic PMMA (Polymethyl-Methacrylate). The aspheric lens shape permits the collimated visualization light to traverse the tube as a parallel contracted beam, and to emerge as a parallel re-expanded beam. The whole sequences of the shock wave propagation and growth of the cavitation bubbles from the end of the optical fiber were visualized by time-resolved high speed shadowgraph method. The result clearly shows potential application of the present laser shock wave generation method to precise medical procedures like revascularization in neurosurgery and other shock wave therapies.

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29-7$B!!!Z0lHL1iBj![(B
$B!!!!(BStudy of laser induced underwater shock waves in an optical tube for medical applications
$B!!!!!!(BNanomedicine Division, Tohoku University Biomedical Engineering Research Organization (TUBERO)	S.H.R.Hosseini, K. Takayama
Production of micro underwater shock waves and vapor cavities induced by short pulse laser irradiation through an optical fiber has been studied. Energy source was a Q-switched Ho:YAG laser with 91 mJ/Pulse energy measured at the end of a 0.60 mm diameter quartz glass optical fiber, pulse duration of 200 ns, and wavelength of 2100 nm. For visualization of laser induced shock waves in a confined space, a transparent tube of 5 mm inner diameter with 13.3 mm and 40.0 mm dimension aspheric shape outer wall was designed and constructed. This 60.0 mm length test section was made of acrylic PMMA (Polymethyl-Methacrylate). The aspheric lens shape permits the collimated visualization light to traverse the tube as a parallel contracted beam, and to emerge as a parallel re-expanded beam. The whole sequences of the shock wave propagation and growth of the cavitation bubbles from the end of the optical fiber were visualized by time-resolved high speed shadowgraph method. The result clearly shows potential application of the present laser shock wave generation method to precise medical procedures like revascularization in neurosurgery and other shock wave therapies.

29-8$B!!!Z0lHL1iBj![(B
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29-9$B!!!Z0lHL1iBj![(B
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29-10$B!!!Z0lHL1iBj![(B
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29-11$B!!!Z0lHL1iBj![(B
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29-12$B!!!Z0lHL1iBj![(B
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29-13$B!!!Z0lHL1iBj![(B
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29-14$B!!!Z>INcJs9p![(B
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29-15$B!!!Z>INcJs9p![(B
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