Friday, April 13, 2001
Dr. Leonard Golding, a former heart surgeon, is leading a team at
the Cleveland Clinic's Foundation developing a new LVAD called the CorAide. It
eliminates hemolysis and thrombosis problems by eliminating the seal and
reducing the pump to only three main components.
The pump's three components include a one-piece cast titanium
volute housing, a stator housing containing the motor windings, and a
cylindrical rotating assembly (the only moving part) containing a permanent
magnet and a set of impeller vanes on each axial end of the assembly.
The main pumping end of the rotating assembly has a primary
impeller, while the opposite end has a secondary impeller that allows a balance
of axial hydraulic forces. The configuration uses an inside-out motor along with
an inside-out radial bearing. The inside-out motor combines the magnetic drive
and bearing into one feature, and eliminates the need for a dynamic seal.
"The results in the animal model suggest that the CorAide pump
design is ready to begin pre-clinical qualification for use in humans," says
Dave Horvath, a mechanical engineer at the Cleveland Clinic Foundation who
helped design CorAide. For more information, contact Horvath at Cleveland Clinic
Foundation, Department of Biomedical Engineering, 9500 Euclid Ave., Cleveland,
OH 44195; Tel: (216) 445-3226; FAX: (216) 444-9198.