Implantable centrifugal pump with hybrid magnetic bearings.
Test methods and results of in vitro assessment of a centrifugal pump with a magnetically suspended impeller are provided. In vitro blood tests have been completed with a resulting normalized milligram index of hemolysis (NmIH) of 12.4 +/- 4.1, indicating that hemolysis is not a problem. Hydraulic characterization of the system with water has shown that a nominal pumping condition of 6 L/min at 100 mmHg was met at 2,200 rpm. Maximum clinically usable cardiac output is predicted be 10 L/min. The magnetic bearing supported impeller did not contact the housing and was shown to be stable under a variety of pumping conditions. The driving motor efficiency is 75% at the nominal condition. Finally, a description of the clinical version of the pump under development is provided.
Bearnson
G B
GB
MedQuest Products, Salt Lake City, Utah 84103, USA.
Olsen
D B
DB
Khanwilkar
P S
PS
Long
J W
JW
Sinnott
M
M
Kumar
A
A
Allaire
P E
PE
Baloh
M
M
Decker
J
J
D006353:Heart-Assist Devices; D008280:Magnetics; D011474:Prosthesis Design