title: A passively suspended Tesla pump left ventricular assist device.
abstract: The design and initial test results of a new passively suspended Tesla type left ventricular assist device blood pump are described. Computational fluid dynamics (CFD) analysis was used in the design of the pump. Overall size of the prototype device is 50 mm in diameter and 75 mm in length. The pump rotor has a density lower than that of blood and when spinning inside the stator in blood it creates a buoyant centering force that suspends the rotor in the radial direction. The axial magnetic force between the rotor and stator restrain the rotor in the axial direction. The pump is capable of pumping up to 10 L/min at a 70 mm Hg head rise at 8,000 revolutions per minute (RPM). The pump has demonstrated a normalized index of hemolysis level below 0.02 mg/dL for flows between 2 and 9.7 L/min. An inlet pressure sensor has also been incorporated into the inlet cannula wall and will be used for control purposes. One initial in vivo study showed an encouraging result. Further CFD modeling refinements are planned and endurance testing of the device.
authors.affiliation: Advanced Bionics, Inc., Hopkins, Minnesota, USA.
authors.forename: Valentin
authors.initials: V
authors.lastname: Izraelev
authors.forename: William J
authors.initials: WJ
authors.lastname: Weiss
authors.forename: Bryan
authors.initials: B
authors.lastname: Fritz
authors.forename: Raymond K
authors.initials: RK
authors.lastname: Newswanger
authors.forename: Eric G
authors.initials: EG
authors.lastname: Paterson
authors.forename: Alan
authors.initials: A
authors.lastname: Snyder
authors.forename: Richard B
authors.initials: RB
authors.lastname: Medvitz
authors.forename: Joshua
authors.initials: J
authors.lastname: Cysyk
authors.forename: Walter E
authors.initials: WE
authors.lastname: Pae
authors.forename: Dennis
authors.initials: D
authors.lastname: Hicks
authors.forename: Branka
authors.initials: B
authors.lastname: Lukic
authors.forename: Gerson
authors.initials: G
authors.lastname: Rosenberg
mesh_terms: D000818:Animals; D001243:Assisted Circulation / Q000295:instrumentation*; D002417:Cattle; D004867:Equipment Design; D006352:Heart Ventricles; D006353:Heart-Assist Devices; D006461:Hemolysis