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:
Jul. 04, 1989
Filed:
Mar. 11, 1988
Keiichi Iwakoshi, Nasu, JP;
Mitsuru Sato, Shibuya, JP;
Hiroyuki Umeda, Kasukabe, JP;
Toshinori Nishizawa, Mitaka, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Kabushiki Kaisha Machidaseisakujyo Bunkyo-ku, Tokyo, JP;
Abstract
An apparatus for transmitting liquid and gas in an endoscope comprising conduits for transmitting liquid and gas to an observation optical system to clean the observation optical system; and an automatic change-over device for sequentially operating both modes of the liquid and gas transmissions by turning on and off only a liquid transmitting switch disposed in an operating portion. The automatic change-over device comprises a first electromagnetic valve disposed in the liquid transmitting conduit, a second electromagnetic valve disposed in the gas transmitting conduit, a circuit for connecting the first and second electromagnetic valves to the liquid transmitting switch of the operating portion, and a control section for controlling the operations of the electromagnetic valves. When the liquid transmitting switch is turned on, the first electromagnetic valve is opened to transmit the liquid to the liquid transmitting conduit, and when the liquid transmitting switch is turned off, the first electromagnetic valve is automatically closed and the second electromagnetic valve is automatically opened to transmit the gas to the gas transmitting conduit for a constant or predetermined time.