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Title:
ARTIFICIAL HEART PUMP WITH DYNAMIC PRESSURE BEARING
Document Type and Number:
WIPO Patent Application WO/2006/137496
Kind Code:
A1
Abstract:
In order not to recirculate blood serving as working fluid flowing through the gap in an impeller dynamic pressure bearing of an artificial heart pump from the delivery side of an impeller and to support the impeller body (8) only with one thrust dynamic pressure bearing, the impeller (5) is constituted of the impeller body (8) and an impeller bearing member (9), a permanent magnet (21) is arranged along the tubular surface (7), and vanes (6) are provided radially on the lower surface. An inside casing (4) is provided with a casing bearing member (17), a radial dynamic pressure bearing with a dynamic pressure groove is formed in any one of the outer circumferential surface (13) of the upper tubular portion (11) of the impeller bearing member (9) and the tubular inner circumferential surface (18) of the casing bearing member (17), and a thrust dynamic pressure bearing with a dynamic pressure groove is formed in one of the outer circumferential surface (13) of the upper surface (15) of the impeller bearing member (9) and the lower end face (19) of the casing bearing member (17). The working fluid is introduced through these dynamic pressure grooves from an impeller inlet and discharged to the impeller delivery side. During rotation, the impeller (5) is lifted and its thrust force is received only by the thrust dynamic pressure bearing arranged above.

Inventors:
Yamane, Takashi c/o National Institute of Advanced Industrial Science and Technology (2-1 Namiki 1-Chome, Tsukuba-sh, Ibaraki 64, 30585, JP)
Application Number:
PCT/JP2006/312541
Publication Date:
December 28, 2006
Filing Date:
June 22, 2006
Export Citation:
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Assignee:
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (3-1 Kasumigaseki 1-chome, Chiyoda-ku Tokyo, 21, 10089, JP)
Yamane, Takashi c/o National Institute of Advanced Industrial Science and Technology (2-1 Namiki 1-Chome, Tsukuba-sh, Ibaraki 64, 30585, JP)
International Classes:
A61M1/10; F04D13/06; F04D29/046
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