| Project/Area Number |
04557061
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thoracic surgery
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| Research Institution | Keio University |
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Principal Investigator |
YOZU Ryohei Keio Univ.Sch.of Med.Assistant Prof., 医学部, 講師 (30129738)
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| Co-Investigator(Kenkyū-buntansha) |
ONOKUCHI Katsuhisa Keio Univ.Sch.of Med.Resident., 医学部, 助手 (00214198)
ITO Tsutomu Keio Univ.Sch.of Med.Resident., 医学部, 助手 (00232455)
MITAMURA Yoshinori Hokkaido Tokai Univ, Sch.of Eng, Prof., 工学部, 教授 (70002110)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1992: ¥3,700,000 (Direct Cost: ¥3,700,000)
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| Keywords | Valvo-pump / Circulatory support / Axial flow pump / Artificial heart / Nonpulsatile flow / Blood pump / Assisted Circulation / Ferrofluidic seal / Valvo‐Pump |
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| Research Abstract |
We have developed the Valvo-Pump, an axial flow blood pump, which is implanted at the natural heart valve position. This device has several advantages ; it fits well anatomically, its blood-contacting surface is small because the left or right ventricular cavity is used as the blood storage reservoir, and it is implanted as easily as an artificial heart valve replacement. The Valvo-Pump consists of an impeller and a motor, both of which are encased in a housing. An impeller with 5 vanes (22.0mm in diameter) is connected to a samariumm-cobalt-rare earth magnet direct current (DC) brushless motor (21.3mm in diameter and 24.9-mm-long). Sealing is achieaved by means of aferrofruidic seal. A pump flow of 16.11/min was obtained at a pump differential pressure of 7.7 kPa (58mmHg), and a flow of 5.01/min at 18.4 kPa (318mmHg) with a motor speed of 8500 revolutions per min (rpm). Sealing was kept perfect against a pressure of 29.3 kPa (220mmHg) at 9000 rpm. The Valvo-Pump is a very promising and simple method of circulatory support.
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