title: Performance characterization of a rotary centrifugal left ventricular assist device with magnetic suspension.
abstract: The MiTiHeart (MiTiHeart Corporation, Gaithersburg, MD, USA) left ventricular assist device (LVAD), a third-generation blood pump, is being developed for destination therapy for adult heart failure patients of small to medium frame that are not being served by present pulsatile devices. The pump design is based on a novel, patented, hybrid passive/active magnetic bearing system with backup hydrodynamic thrust bearing and exhibits low power loss, low vibration, and low hemolysis. Performance of the titanium alloy prototype was evaluated in a series of in vitro tests with blood analogue to map out the performance envelop of the pump. The LVAD prototype was implanted in a calf animal model, and the in vivo pump performance was evaluated. The animal's native heart imparted a strong pulsatility to the flow rate. These tests confirmed the efficacy of the MiTiHeart LVAD design and confirmed that the pulsatility does not adversely affect the pump performance.
authors.affiliation: MiTiHeart Corporation, Gaithersburg, MD, USA.
authors.forename: Said
authors.initials: S
authors.lastname: Jahanmir
authors.forename: Andrew Z
authors.initials: AZ
authors.lastname: Hunsberger
authors.forename: Hooshang
authors.initials: H
authors.lastname: Heshmat
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Tomaszewski
authors.forename: James F
authors.initials: JF
authors.lastname: Walton
authors.forename: William J
authors.initials: WJ
authors.lastname: Weiss
authors.forename: Branka
authors.initials: B
authors.lastname: Lukic
authors.forename: William E
authors.initials: WE
authors.lastname: Pae
authors.forename: Conrad M
authors.initials: CM
authors.lastname: Zapanta
authors.forename: Tigran Z
authors.initials: TZ
authors.lastname: Khalapyan
mesh_terms: D000497:Alloys / Q000737:chemistry; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry; D040761:Biomimetic Materials / Q000737:chemistry; D001794:Blood Pressure / Q000502:physiology; D001831:Body Temperature / Q000502:physiology; D002417:Cattle; D055590:Electromagnetic Phenomena / Q000295:instrumentation*; D004868:Equipment Failure; D005990:Glycerol / Q000737:chemistry; D006353:Heart-Assist Devices; D006461:Hemolysis / Q000502:physiology; D008297:Male; D008422:Materials Testing / Q000295:instrumentation*; D023421:Models, Animal; D011474:Prosthesis Design / Q000295:instrumentation*; D011673:Pulsatile Flow / Q000502:physiology; D012399:Rotation; D014025:Titanium / Q000737:chemistry; D014732:Vibration; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D014867:Water; D014025:Titanium; D005990:Glycerol