title: Implantable centrifugal pump with hybrid magnetic bearings.
abstract: 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.
authors.affiliation: MedQuest Products, Salt Lake City, Utah 84103, USA.
authors.forename: G B
authors.initials: GB
authors.lastname: Bearnson
authors.forename: D B
authors.initials: DB
authors.lastname: Olsen
authors.forename: P S
authors.initials: PS
authors.lastname: Khanwilkar
authors.forename: J W
authors.initials: JW
authors.lastname: Long
authors.forename: M
authors.initials: M
authors.lastname: Sinnott
authors.forename: A
authors.initials: A
authors.lastname: Kumar
authors.forename: P E
authors.initials: PE
authors.lastname: Allaire
authors.forename: M
authors.initials: M
authors.lastname: Baloh
authors.forename: J
authors.initials: J
authors.lastname: Decker
mesh_terms: D006353:Heart-Assist Devices; D008280:Magnetics; D011474:Prosthesis Design