Mr. Kenji Kaneko Profile

Kenji Kaneko

at Keio Univ

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Publications (6)

Proceedings Article | 23 March 2007 Paper

Development of novel short-term heating angioplasty: diameter and elasticity change of vascular wall ex vivo

Natsumi Shimazaki, Kenji Kaneko, Eriko Nakatani, Tsunenori Arai

Proceedings Volume 6424, 642424 (2007) https://doi.org/10.1117/12.701797

KEYWORDS: Collagen, Arteries, Injuries, Prototyping, Temperature metrology, Safety, Nd:YAG lasers, Diagnostics, Metals, Laser irradiation

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Proceedings Article | 23 March 2007 Paper

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

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

Proceedings Volume 6424, 642420 (2007) https://doi.org/10.1117/12.700045

KEYWORDS: Laser irradiation, Arteries, Laser energy, Laser therapeutics, Collagen, Birefringence, Blood vessels, Pulsed laser operation, Photography, In vivo imaging

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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) (&lgr;=2.1&mgr;m) was used. The laser energy was delivered by a silica glass fiber (outer diameter: 1000&mgr;m, core diameter: 600&mgr;m). 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.

Proceedings Article | 21 February 2007 Paper

Air leak seal for lung dissection plane with diode laser irradiation: an ex-vivo study

Maya Gotoh, Hisako Tokunaga, Kenji Kaneko, Tsunenori Arai

Proceedings Volume 6435, 64350G (2007) https://doi.org/10.1117/12.701476

KEYWORDS: Lung, Semiconductor lasers, Absorption, Gas lasers, Laser irradiation, Carbon monoxide, Laser energy, Laser tissue interaction, Natural surfaces, Surgery

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Proceedings Article | 6 February 2007 Paper

Utility of birefringence changes due to collagen thermal denaturation rate process analysis: vessel wall temperature estimation for new short term heating balloon angioplasty

Kenji Kaneko, Natsumi Shimazaki, Maya Gotoh, Eriko Nakatani, Tsunenori Arai

Proceedings Volume 6435, 64350F (2007) https://doi.org/10.1117/12.699962

KEYWORDS: Birefringence, Collagen, Tissues, Scanning electron microscopy, Temperature metrology, Tissue optics, Microscopy, In vivo imaging, Arteries, Microscopes

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Proceedings Article | 25 April 2005 Paper

Angioscope visualization in blood vessel using Ho:YAG laser-induced vapor bubble

Erika Yamashita, Yasunobu Oka, Kenji Kaneko, Eriko Suga, Tsunenori Arai

Proceedings Volume 5686, (2005) https://doi.org/10.1117/12.590183

KEYWORDS: Blood, Laser irradiation, Fiber lasers, Arteries, Photography, Pulsed laser operation, Blood vessels, Lamps, In vivo imaging, Optical fibers

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Proceedings Article | 25 April 2005 Paper

Prevention of intimal hyperplasia using short-period vascular heating without surrounding tissue injury: in vitro/in vivo experiments and thermal conduction calculation

Eriko Suga, Kenji Kaneko, Hikaru Futami, Erika Yamashita, Tsunenori Arai

Proceedings Volume 5686, (2005) https://doi.org/10.1117/12.590167

KEYWORDS: Temperature metrology, Arteries, In vitro testing, In vivo imaging, Injuries, Animal model studies, Tissues, Laser irradiation, Laser therapeutics, Metals

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Showing 5 of 6 publications

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