title: Development of a compact, highly efficient, totally implantable motor-driven assist pump system.
abstract: We have developed a compact, highly efficient, totally implantable assist pump system, which consists of a motor-driven assist pump and a transcutaneous energy and optical information transmission system. The motor-driven assist pump consists of a.d.c. brushless motor and a specially designed miniature ball screw. A magnetic coupling mechanism between the blood pump and an actuator provides active blood filling via mild suction force. The controller consists of a PID follow-up controller using an 8-bit one-chip microcomputer. The volume of the pump is 350 ml, and its controller is 210 ml. Pump outflow of 5.8 L/min was obtained against a mean after-load of 100 mm Hg. The pump showed a high efficiency rate and good durability. An efficiency rate of 19-21% (pump output/motor input) was obtained during 87 days of continuous pumping. No mechanical trouble occurred for an accumulated period of 6 months.
authors.affiliation: Division of Biomedical Engineering, Faculty of Engineering, Hokkaido University, Sapporo, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Okamoto
authors.forename: K
authors.initials: K
authors.lastname: Tomoda
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Mitamura
authors.forename: T
authors.initials: T
authors.lastname: Mikami
mesh_terms: D000497:Alloys; D001698:Biomedical Engineering; D001794:Blood Pressure; D011211:Electric Power Supplies; D004853:Epoxy Resins; D004867:Equipment Design; D005240:Feasibility Studies; D006353:Heart-Assist Devices; D018056:Hemorheology; D006801:Humans; D008280:Magnetics; D008422:Materials Testing; D008838:Microcomputers; D011140:Polyurethanes; D012399:Rotation; D012826:Silicone Elastomers; D013193:Stainless Steel; D014025:Titanium
chemical_list: D000497:Alloys; D004853:Epoxy Resins; D011140:Polyurethanes; D012826:Silicone Elastomers; D013193:Stainless Steel; C031462:titanium alloy (TiAl6V4); D014025:Titanium