The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 1990
Filed:
Aug. 04, 1988
Masakazu Nakagawa, Tokyo, JP;
Sanshiro Takamiya, Nagoya, JP;
Aisin Seiki Kabushiki Kaisha, Aichi, JP;
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.