초록 ▼

A magnetically-driven centrifugal blood pump includes a housing and an impeller mounted for rotation within. The impeller includes a generally disk-shaped base plate and a plurality of curvilinear vanes extending axially upward therefrom. The vanes project radially outward from the base plate approx

A magnetically-driven centrifugal blood pump includes a housing and an impeller mounted for rotation within. The impeller includes a generally disk-shaped base plate and a plurality of curvilinear vanes extending axially upward therefrom. The vanes project radially outward from the base plate approximately one-third of their curvilinear length. The housing includes a rear wall spaced from the impeller base plate across a constant gap, with a sloped transition wall surrounding the rear wall and joining it to a peripheral wall. A tangential outlet is provided in the peripheral wall. A front wall extends inward from the peripheral wall with a slight conicity to an axial inlet. The vanes each have a front edge which slopes away from the front wall in the radially outward direction to provide a widening gap therebetween. The vanes have inner ends which together define a vane-free inner region below and slightly larger than the inlet. The curvature of each vane changes along its length, and a tangent angle progresses from the inner end to the outer end according to a preferred formula. Desirably, the impeller includes a pair of low magnetic retentivity plates, such as steel, which are driven by an external drive which sets up a rotating magnetic field.

대표청구항 ▼

[ We claim:] [1.] A centrifugal blood pump, comprising:a rigid housing having an axial inlet opening to a wider pumping chamber formed generally symmetrically about an axis, and a tangential outlet from the pumping chamber;the pumping chamber including a generally radially disposed front wall adjace

[ We claim:] [1.] A centrifugal blood pump, comprising:a rigid housing having an axial inlet opening to a wider pumping chamber formed generally symmetrically about an axis, and a tangential outlet from the pumping chamber;the pumping chamber including a generally radially disposed front wall adjacent and surrounding the inlet, a peripheral wall connected to the front wall defining the outer boundary of the pumping chamber, the tangential outlet opening from the peripheral wall, a transition wall connected to the peripheral wall and sloped therefrom radially inward and away from the front wall, and a radially disposed rear wall connected to the transition wall; andan impeller mounted for axial rotation within the pumping chamber, the impeller having a circular base plate parallel to and axially spaced from the rear wall, the base plate having a diameter approximately equal to the diameter of the rear wall, the impeller further including a plurality of curvilinear vanes projecting axially upward from the base plate, each of the vanes having a radially inner end spaced from the axis of the pumping chamber to define collectively therebetween a void, each of the vanes having a rear edge connected to the base plate and continuing radially outwardly therefrom toward the peripheral wall to terminating in outer ends, each vane further including a front edge sloping away from the front wall from the inner end to the outer end.