Ventricular assist system secondary impeller

Details Ventricular assist system secondary impeller Ventricular assist system secondary impeller

2007-03-13

2007-03-13

Pezzuto, Robert (Department: 3766)

Prosthesis (i.e., artificial body members), parts thereof, or ai

Corporeal artificial heart, heart assist , control...

Having enclosed rotary member for directly impelling blood flow

C600S016000, C604S008000, C623S003100

Reexamination Certificate

active

10333760

ABSTRACT:
In a centrifugal flow blood pump, usable in left ventricular assist applications, blood is pumped from an inlet (16) to an outlet (22) by a primary impeller (18). A portion of the blood that enters the pump follows a secondary channel (24) where a secondary impeller (70) routes the blood to lubricate a bearing between an impeller assembly (14) and a post formed by a component of the pump housing. The unique shape of the secondary impeller (70) prevents blood stagnation and provides for a well-washed fluid bearing.

REFERENCES:
patent: 5405251 (1995-04-01), Sipin
patent: 5947703 (1999-09-01), Nojiri et al.
patent: 196 26 244 (1998-02-01), None
patent: WO 94/09274 (1994-04-01), None
patent: WO 99/15212 (1999-04-01), None
S. Nakamura, W. Ding, W. A. Smith, and Leonard A. R. Golding, Blood Flow Analysis for the Secondary Impeller of an IVAS Heart Pump, (5 pgs.) Cleveland, Ohio, 1997.
Stanley B. Malanoski, Helen Belawski, David Horvath, William A. Smith and Leonard R. Golding, Stable Blood Lubricated Hydrodynamic Journal Bearing with Magnetic Loading, Cleveland, Ohio, (4 pgs.) 1998.

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