Patent ID: 7244224

Claim:
A pump driving unit for driving a pump used for supporting or substitution of cardiac function, comprising: a fluid pump for pulsatively driving said cardiac pump; an isolator configured to be connected to said fluid pump by a liquid space and to said cardiac pump by a gas space; and control unit configured to control said fluid pump, wherein said isolator is configured to form a first space and a second space divided from each other by a flexible member, said first space is configured to be connected to said fluid pump and said first space and said liquid space are filled with a liquid as an incompressible fluid, said second space is configured to be connected to said cardiac pump wherein said second space and said gas space are filled with a gas as a compressible fluid, and wherein said isolator transmits pressure change from said fluid space to said gas space, thereby acting as a pressure converter member to apply a driving force to said cardiac pump used for supporting or substitution of cardiac function.