| Project/Area Number |
10450071
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
TAKAYAMA Kazuyoshi Institute of Fluid Science, Tohoku University, Professor, 流体科学研究所, 教授 (40006193)
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| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Satoru Institute of Fluid Science, Tohoku University, Professor, 流体科学研究所, 教授 (10021982)
IORITANI Naomasa School of Medicine, Tohoku University, Research Associate, 医学部, 助手 (50232145)
SASHO Akihiro Institute of Fluid Science, Tohoku University, Associate Professor, 流体科学研究所, 助教授 (40215752)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥12,600,000 (Direct Cost: ¥12,600,000)
Fiscal Year 1999: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1998: ¥8,400,000 (Direct Cost: ¥8,400,000)
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| Keywords | Underwater shock waves / Tissue model / Holographic interferometry / Numerical simulation / Perforation / Cancer cell / Shock wave / 値シミュレーション |
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| Research Abstract |
Extracoporeal shock wave lithotripsy (ESWL), non-invasive removal of kidney stones, is one of the most peaceful applications of shock waves. As a collaboration project with Medical School of Tohoku University we have developed prototype lithotriptor which was approved by the Ministry of Health and Welfare. As a result of basic research, tissue damages during ESWL treatments have been clarified and we found a technology to damage living tissue in a controlled fashion. This technology is extended to cancer research with the combination of chemotherapy during which it was discovered punctuation on the cancer cells when shock waves were exposed on them. The mechanism of punctuation is found to be related with shock wave interaction with nonhomogeneity of a medium with local curvature. The goal of present research is to clarify the mechanism of the punctuation in details.
Results obtained are summarized as following :
(1) Optical flow visualization of shock/tissue interaction has been developed. However, it has a limitiation in its spatial resolution. In order to compensate it, we seek for model tissues which have analogous characteristics to living tissues, with which various analogue experiments have been conducted and the results have been numerically simulated.
(2) Finite fringe holographic interferometry has been developed and Fourier fringe analysis was well established. This method allowed to identify a slight density change created by shock wave exposures and was found to be effectively extended further shock/tissue interaction studies.
(3) Numerical methods have been developed to be compared with experiments. Interactions between shock waves and various gas liquid interfaces have been successfully simulated.
(4) A vertcal gas gun has been designed and constructed with which micro-shock/tissue interaction will be investigated. This is a facility which can directly simulate shock induced perforation on model tissue surface.
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