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Your search keyword '"Masahiro NISHIDA"' showing total 22 results
Start Over Author "Masahiro NISHIDA" Publisher the society of life support technology
22 results on '"Masahiro NISHIDA"'

3. [Untitled]

Author

Ryo KOSAKA, Masahiro NISHIDA, Osamu MARUYAMA, Tatsuya HIDAKA, Takeshi OKUBO, and Takashi YAMANE

Published
2008

4. [Untitled]

Author

Osamu Maruyama, Tatsuo Tsutsui, Masahiro Nishida, Takashi Yamane, and Tbmoaki Jikuya

Subjects
medicine.medical_specialty, Materials science, medicine, Electromagnetic suspension, Biomedical engineering, Surgery
Published
2005

5. [Untitled]

Author

Tomio Onoguchi, Toru Masuzawa, Tatsuo Tsutsui, Tomoaki Jikuya, Takashi Yamane, Tomomi Iwasaki, Osamu Maruyama, and Masahiro Nishida

Subjects
Materials science, Stressor, Shear stress, Rotational shear, Composite material
Published
2002

7. Flow Visualization Measurement of Velocity Profiles in the Impeller/Housing Gap of a Centrifugal Blood Pump

Author

Balazs Asztalos, Helen Clark, Takashi Yaman, Toshio Kobayashi, and Masahiro Nishida

Subjects
Flow visualization, Impeller, Boundary layer, symbols.namesake, Materials science, Rotodynamic pump, symbols, Centrifugal blood pump, Reynolds number, Mechanical engineering, Mechanics, Boundary layer thickness, Centrifugal pump
Abstract

A flow visualization study of a centrifugal blood pump was conducted to find velocity profiles in the gap between the impeller and the housing. Investigating a wide range of Reynolds numbers and specific speeds, it was found that high shear is found only in the boundary layers of the moving and stationary walls and that the total thickness of the boundary layers is 0. 3-0. 6mm depending the Reynolds number.

Published
1998

8. Effect of gaps between impeller tip and casing wall upon hemolysis property of a centrifugal blood pump

Author

Masahiro Nishida, Kazuyuki Ito, Seiko Endo, Yoshiaki Konishi, Yuki Miyazoe, Yoshiyuki Taenaka, Takashi Yamane, Balazs Asztalos, Eisuke Tatsumi, Tomonori Tsukiya, Toru Masuzawa, and Toshio Sawairi

Subjects
Flow visualization, Materials science, business.industry, Flow (psychology), Mechanical engineering, Mechanics, Computational fluid dynamics, medicine.disease, Centrifugal pump, Hemolysis, Impeller, medicine, Shear stress, business, Casing
Abstract

The purpose of this study is to examine the relationship between the flow condition and hemolysis level by integrating hemolysis test, flow visualization and computational fluid dynamics(CFD)to establish design criteria for the good hemocompatible centrifugal pump. Axial and radial gaps between the impeller tip and casing wall of Nikkiso centrifugal blood pump were modified independently and flow condition and hemolytic property of these pumps were examined. Examined gaps were 1.5, 1.0, and 0.5 mm for axial gap and 3.0, 2.0, 1.0, and 0.5 mm for radial gap, respectively. The pumps with the axial gap of 0.5 mm and the radial gap of 0.5 mm showed higher hemolysis level than the other pumps showed. Maximum shear stress in the pump, estimated by CFD, were increased by decreasing the radial gap from 3.0 to 0.5 mm. Regional flow pattern change at the tongue region by decreasing radial gap was observed by flow visualization. Gaps between impeller tip and casing wall are dominant factors to determine hemolytic property of the centrifugal pump. Relationship between regional flow pattern and blood trauma should be investigated in the future.

Published
1998

9. Relationship between surface roughness and hemolysis

Author

Ikuya Ohshima, Toru Masuzawa, Yusuke Numata, Takasi Yamane, Yoshikazu Adachi, Masahiro Nishida, and Osamu Maruyama

Subjects
Materials science, Surface roughness, medicine, Composite material, medicine.disease, Hemolysis
Published
2004

15. Flow Analysis of MERA monopivot centrifugal blood pump

Author

Yoshihiro Yamamoto, Masahiro Nishida, Katsuyuki Kuwana, Takashi Yamane, Hisato Kogure, Ryo Kosaka, Yoshiyuki Sankai, Tatsuo Tsutsui, Osamu Maruyama, and Hiroshi Kawamura

Subjects
Materials science, Flow (mathematics), Centrifugal blood pump, Mechanics
Published
2007

17. Hemolysis due to Surface Roughness under Laminar Shear Flow Field

Author

Yudai Kawaguchi, Takashi Yamane, Osamu Maruyama, Masahiro Nishida, Bunshu Nagai, Yoshikazu Adachi, and Toru Masuzawa

Subjects
Materials science, Field (physics), Surface roughness, medicine, Laminar flow, Mechanics, medicine.disease, Shear flow, Hemolysis
Published
2007

19. Flow analysis in a rotational shear stressor

Author

Toru Masuzawa, Takashi Yamane, Masahiro Nishida, Ikuya Oshima, and Osamu Maruyama

Subjects
Materials science, Flow (mathematics), Stressor, Mechanics, Rotational shear
Published
2006

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