title: Development of a totally implantable biventricular bypass centrifugal blood pump system.
abstract: BACKGROUND
  During the past 2 years, the development of a totally implantable biventricular bypass rotary blood pump system has been made.
  
  
  METHODS
  An extracorporeal gyro centrifugal pump, the CIE3, was miniaturized and developed into the PI601, a totally implantable plastic pump. Two-day anatomic and hemodynamic feasibility studies demonstrated that these two pump systems were easily implantable inside a calf's abdominal wall, directly under the diaphragm. The priming volume of the pump was 20 mL, with sufficient cardiac outputs at approximately 2,000 rpm and requiring less than 10 W of power. Two-week antithrombogenic screening tests also revealed these pump systems to be quite antithrombogenic. In addition, 1-month system reliability studies demonstrated fail-safe reliable performances.
  
  
  CONCLUSIONS
  Encouraged by these preliminary studies, the PI601 model was converted to the permanently implantable titanium gyro pump PI702 model. The long-term implantations were initiated approximately 3 months ago, and two such long-term LVAD studies are currently underway with no sign of difficulty (October 10, 1997). They were followed 283 days and 72 days, respectively. Both terminated due to functional inflow obstruction. There were no blood clots or emboli at autopsy.
authors.affiliation: Department of Surgery, Baylor College of Medicine, Houston, Texas 77030, USA. ynose@bcm.tmc.edu
authors.forename: Y
authors.initials: Y
authors.lastname: Nosé
authors.forename: K
authors.initials: K
authors.lastname: Nakata
authors.forename: M
authors.initials: M
authors.lastname: Yoshikawa
authors.forename: G V
authors.initials: GV
authors.lastname: Letsou
authors.forename: A
authors.initials: A
authors.lastname: Fujisawa
authors.forename: E
authors.initials: E
authors.lastname: Wolner
authors.forename: H
authors.initials: H
authors.lastname: Schima
mesh_terms: D000818:Animals; D002417:Cattle; D004867:Equipment Design; D004869:Equipment Safety; D005260:Female; D006333:Heart Failure / Q000209:etiology / Q000401:mortality / Q000601:surgery*; D006354:Heart, Artificial; D006353:Heart-Assist Devices; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008134:Long-Term Care; D008297:Male; D008422:Materials Testing; D008904:Miniaturization; D015996:Survival Rate