US Patent 9133854 Centrifugal blood pump device

A centrifugal blood pump device includes a housing, a centrifugal pump section having an impeller which rotates in the housing to send blood by centrifugal force upon rotation, an impeller rotation torque generation section for attracting a magnetic member of the impeller and rotating the impeller, and a plurality of grooves for hydrodynamic bearing provided on an inner face of the housing on the impeller rotation torque generation section side. A side wall of each of the grooves for hydrodynamic bearing is formed as an inclined side wall inclined obliquely such that the groove for hydrodynamic bearing is expanded from a bottom face of the groove for hydrodynamic bearing toward an opening face of the groove for hydrodynamic bearing.