Surgery – Cardiac augmentation – Aortic balloon pumping
Patent
1988-08-04
1990-12-04
Pellegrino, Stephen C.
Surgery
Cardiac augmentation
Aortic balloon pumping
623 3, A61M 102
Patent
active
049747746
ABSTRACT:
A medical appliance driving apparatus includes positive and negative pressure sources and an isolator having an input chamber and an output chamber which are defined by a movable membrane. A first switching valve is connected to the positive pressure source and has its output side connected to the input chamber. A second switching valve is connected to the negative pressure source and has its input side connected to the input chamber. A solenoid valve is also connected to the input chamber. A microcomputer supplies the isolator with a positive or negative pressure by controlling the operation of the first or second switching valve, and after opening the first switching valve, closes it and controls the operation of the solenoid valve so as to adjust the pressure in the input chamber to a predetermined positive pressure value. A positive pressure is supplied to the input chamber of the isolator by opening the first switching valve, thus moving the movable membrane in a direction in which the medical appliance is expanded. After the medical appliance has sufficiently been expanded, the supply of positive pressure is cut off, and the operation of the solenoid valve is controlled so that the pressure in the input chamber is adjusted to a predetermined positive pressure value. Accordingly, when a negative pressure is supplied by opening the second switching valve at the subsequent timing, the negative pressure can be made to act even more effectively. Thus, it is possible to quicken the movement of the medical appliance when contracted.
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Nakagawa Masakazu
Takamiya Sanshiro
Aisin Seiki Kabushiki Kaisha
Lewis Ralph
Pellegrino Stephen C.
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