Wb have been developing an electrohydraulic ventricular assist device(EVAD)for small patients,such as women and children.In order to develop the small and flat ventricular assist device implanted in a patient's abdomen,a flat electrohydraulic actuator which consists of a disk type motor and an oil pump was developed.The thickness of a developed motor is28.5mm.The motor could generate a torque of0.08Nm with an excitation current of1A. Maximum speed and efficency are2600rpm and77%,respectively

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... thickness,diameter,volume and weight of the electrohydraulic actuator are48mm,78mm,280ml,800g,respectively Maximum pressure head,flow rate and pump efficiency of the actuator are510mmHg,14.2L/min,24%,respectively.The developed actuator was connected to a di aphragm type blood pump and the capability as an EVAD was evaluated.The EVAD could generate a flow rate of5.0 L/min against an afterload of100mmHg with a pulse rate of70bpm.Power consumption of it was from15to20W . Developed device indicated sufficient performance as a ventricular assist device.Clinically available artificial heart will be developed with further improvement of the electrohydraulic actuator.